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"ABSTRAKDalam dunia pengeboran, terdapat istilah sumur cluster yang dimana dalam satusumur terdapat beberapa titik pengeboran yang mempunyai posisi sejajar satusama lain dengan jarak antara 10 m hingga 20 m. Dalam sumur cluster, proses rigup dan rig down menjadi tidak efisien karena membutuhkan waktu yang lebihlama sehingga biaya operasi menjadi lebih besar. Sehingga dalam hal ini,pendorong rig sliding menjadi salah satu alat yang dianggap jauh lebih efektifdalam memangkas waktu dibandingkan dengan metode konvensional yaitudengan rig up dan rig down. Dalam hal ini komponen gripper adalah salah satukomponen yang terdapat di pendorong sliding rig yang berperan sebagaipenahan dalam mekanismenya. Penulisan ini bertujuan untuk merancangkomponen gripper dengan menggunakan material yang terdapat di produsen lokalsehingga komponen dapat dibuat secara mandiri oleh negara Indonesia.

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ABSTRACTIn term of Drilling world. There is cluster well which have multi point ofdrilling hole in parallel position respect with each other. The distance of thiscluster section have about 10m until 20 m for each other hole. In Cluster Well,the rig up and rig down process became inefficiently process because this processrequire more time so the drilling operation cost become ekspensive. In this case,the Sliding Drilling Rig Mover become more efective to cut off the time than theconvesional method which using rig up and rig down. In this Mover, therer iscomponent which called Gripper. This Component have role as Holder to hold theaction force from hydraulic which to push the substructure. This study aimed todesign Gripper components using materials which can be found at localprodusen so with the result that, the components can be independent produced byIndonesia"

"ABSTRAKMemprediksi besar tekanan surge dan swab sangat penting dalam proses pengeboran minyak dan gas bumi. Perhitungan tekanan surge dan swab yang akurat dapat memudahkan kita dalam merencanakan operasi pengeboran, khususnya pengeboran pada sumur yang membutuhkan safety yang tinggi, celah antara pipa pengeboran dan wellbore yang sempit dan pada sumur dengan kedalaman yang tinggi. Tekanan surge yang berlebihan dapat menyebabkan lost circulation dan retak formasi, sedangkan tekanan swab yang berlebihan dapat menyebabkan kick dan blowout, dimana untuk menyelesaikan permasalahan-permasalahan ini membutuhkan biaya yang sangat besar. Mengingat ribuan sumur dieksplorasi di tiap tahunnya, fenomena ini adalah hal penting bagi industri minyak dan gas bumi untuk meminimalisir biaya eksplorasi. Hasil studi teoritis dan lapangan telah menunjukan bahwa tekanan surge dan swab dipengaruhi oleh parameter-parameter seperti kecepatan pipa, geometri wellbore, faktor eksentrisitas, reologi fluida dan apakah pipa yang digunakan terbuka atau tertutup. Penelitian ini bertujuan untuk menganalisis besar karakteristik tekanan surge dan swab dalam skala laboratorium dengan variasi kecepatan pipa 0.08 m/s, 0.10 m/s, dan 0.12 m/s. Set-up alat terdiri dari ID 56 mm pipa akrilik dan OD 34 mm pipa besi yang dapat bergerak vertikal dengan menggunakan sistem angkat sederhana. Tekanan pada dinding sumur diukur menggunakan dua pressure transmitter dengan fluida pengeboran yang digunakan adalah air dan campuran 3500 ml air dan 150 gr bentonite. Dari hasil penelitian ini, kecepatan pipa pengeboran mempengaruhi besar tekanan surge dan swab. Kecepatan pipa terbesar 0.12 m/s menghasilkan gradien tekanan surge dan swab terbesar yaitu 0.0229 psi/ft dan 0.0256 psi/ft.

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ABSTRACTSurge and swab pressure prediction is very important in drilling process during well construction operations. Accurately predicting surge and swab pressure model can ease on planning drilling operation, mainly in wells with high safety environment, low-clearance casings and deep water wells. Excessive surge pressure can lead to a number of costly drilling problems such as lost circulation and formation fracture, while excessive swab pressure can result in kicks, and blowouts. As thousands of wells are drilled every year, this phenomenon is of economic importance for the oil industry. Recent theoretical and field studies have indicated that surge and swab pressure depends on many parameters such as drill pipe movement speed, wellbore geometry, eccentricity factor, fluid rheology, and whether the pipe is open-ended or closed-ended. The study aimed at analyzing the effects of pipe movement speed on surge and swab pressures under laboratory conditions. Experimental study was performed in a test setup that can varying the drill pipe movement speed and measuring the surge and swab pressures. The setup consists of ID 56 mm fully transparent polycarbonate tubing and OD 34 mm inner steel pipe, which moves vertically using a simple hoisting system. Pressure on the wall of the well was measured using two pressure transmitters at various drill pipe movement speed and drilling fluid in this experiments were conducted using water and water based mud which is 3500 ml water mixed with 150 gr bentonite. The experimental results showed that the speed of the drill string downward and upward affects surge and swab pressure. From the study, it was concluded that at the highest downward and upward speed of drill pipe, the surge and swab pressure increases respectively. Maximum speed of downward and upward drill pipe at 0.12 m/s results the highest surge pressure and swab pressure at 0.0229 psi/ft and 0.0256 psi/ft."

"Secara alami, produksi minyak dan gas (migas) akan mengalami penurunan(decline). Berbagai upaya dilakukan untuk mempertahankan tingkat produksimigas sekaligus meningkatkan produksinya. Salah satu upaya adalah denganmelakukan pemboran sumur baru. Kegiatan pemboran merupakan suatu kegiatanyang memiliki Risiko Bahaya kategori Tinggi. Mitigasi harus dilakukan untukmengurangi potensi bahaya dan mencegah terjadinya kecelakaan kerja.Ruanglingkup penelitian ini mencakup seluruh kegiatan utama yang ada pada suatukegiatan pemboran. Analisa risiko ditinjau dari aspek manusia, peralatan,lingkungan dan citra perusahaan. Metode Bow Tie dilakukan untuk melihat danmenganalisa risiko yang ada pada kegiatan pemboran di PT Pertamina EP. Untukmendukung data penelitian, juga dilakukan pengambilan data berupa kuesionerdari para pekerja yang terlibat di kegiatan pemboran PT Pertamina EP. Secaraumum sudah dilakukan mitigasi untuk kegiatan pemboran di PT Pertamina EPsehingga operasi pemboran tersebut berada pada kondisi aman. Beberapamasukan hasil penelitian ditujukan untuk meningkatkan keamanan operasipemboran PT Pertamina EP

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Naturally, oil and gas production will decline. Some efforts have to do to keep oil

and gas production rate as well as to increase the production. One of them is

drilling new well. Basically, hazards in drilling activities are categorized as High

Risk. Mitigation should be done to reduce the potential hazards and prevent

accidents.The scope of this study covers all the major events that exist in a drilling

activities. Analysis of risk in terms of aspects of human, equipment, environment

and corporate image. Bow Tie method is performed to see and analyze the risks

involved in drilling activity in the PT Pertamina EP. To support research data,

also conducted a questionnaire data collection from the workers involved in the

drilling activities of PT Pertamina EP. In general, mitigation has been carried out

for drilling activities at PT Pertamina EP so that the drilling operations are in safe

condition. Some input the results of research aimed at improving the safety of

drilling operations of PT Pertamina EP."

"Kecelakaan kerja menyebabkan terhentinya proses bekerja. Kondisi tidak aman di tempat kerja, atau praktik yang tidak aman dari sesama karyawan, dapat mengganggu orang dan merusak kinerja mereka. Salah satu upaya perusahaan dalam mencegah terjadinya kecelakaan adalah dengan melakukan safety inspection. Skripsi ini membahas tentang evaluasi pelaksanaan safety safety inspection di area kerja drilling oleh PT. Surveyor Indonesia – Drilling & Completion Safety Compliance Audit pada tahun 2012. Penelitian ini merupakan penelitian semi kuantitatif. Untuk melakukan evaluasi, digunakan International Safety Rating System edisi ke-enam tahun 1996, yaitu elemen ketiga mengenai safety inspection. Kerangka konsep penelitian ini diambil dari variabel-variabel yang ada pada ISRS. Secara keseluruhan hasil penilaian safety inspection di PT. Surveyor Indonesia – DCSCA adalah 100 %, bahwa semua sasaran, target, serta pelaksanaan safety inspection sudah sesuai dengan elemen-elemen yang ada dalam International Safety Rating System.

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Workplace injury causes the cessation of the work process. Unsafe conditions in the workplace, or unsafe actions from the workers, could disturb and damage the work performance. One of the company’s efforts to prevent accidents in to do a safety inspection program.This thesis discusses the evaluation of the safety inspection in area of work drilling by PT. Surveyor Indonesia- Drilling & Completion Safety Compliance Audit in 2012. This research is a semi-quantitative. To perform the evaluation, use the International Safety Rating System (ISRS) the sixth edition 1996, the third element of the safety inspection. Conceptual framework were taken from the variables that exist in the ISRS. Overall, of safety inspection at PT. Surveyor Indonesia - DCSCA is 100%, that all goals, targets, and implementation of safety inspection is in accordance with the elements that exist in the International Safety Rating System."

"Seiring berkembangnya teknologi, metode pemboran telah berkembang dari yang sebelumnya hanya pemboran vertikal menjadi pemboran berarah. Pengeboran berarah ada untuk menjangkau area yang sulit dijangkau menggunakan pemboran vertikal konvensional. Pada saat pemboran sedang berlangsung, getaran sering terjadi terutama pada bagian tali bor. Tali bor adalah komponen yang menghubungkan rig dan mata bor. Secara umum, getaran dibagi menjadi tiga jenis, aksial, lateral, dan puntir. Getaran puntir atau “stick-slip” sering dianggap sebagai salah satu mode getaran yang paling merusak. Getaran tersebut dapat mengakibatkan kegagalan atau kerusakan komponen pengeboran yang dapat mengakibatkan kerugian finansial dan waktu bagi perusahaan. Setiap objek bergetar pada frekuensi natural atau tingkat getaran. Sebuah tali bor memiliki banyak komponen yang terdiri dari beberapa sambungan pipa dalam dimensi besar yang masing-masing bagiannya memiliki frekuensi natural tersendiri. Tali bor juga harus berputar jauh dari frekuensi natural atau kecepatan kritisnya karena ini adalah jangkauan kecepatan dimana sebuah benda mengalami getaran parah yang dapat menyebabkan kerusakan tali bor. Gagasan dari makalah penelitian ini adalah membuat model tali bor dan menjalankan simulasi getaran tali bor pada sumur bor saat pengeboran vertikal dan terarah sedang beroperasi. Getaran tersebut terjadi karena adanya kontak antara tali bor dengan dinding sumur. Getaran yang diamati dalam makalah penelitian ini terbatas pada getaran puntir. Analisis getaran yang digunakan adalah analisis getaran paksa teredam menggunakan metode elemen hingga dengan perangkat lunak simulasi ANSYS. Metode elemen hingga digunakan untuk menghitung frekuensi natural dan mode shape dari tali bor dan juga untuk mengamati deformasi maksimum serta stress maksimum dengan variasi panjang tali bor. Model-model ini dapat digunakan untuk merepresentasikan dan mengukur kerusakan tali bor akibat getaran. Untuk membuat simulasi mendekati keadaan sebenarnya, parameter input untuk pemodelan dan simulasi akan dikumpulkan dari beberapa jurnal ilmiah yang telah dikonfirmasi melalui eksperimen sebelumnya. Parameter input tambahan lainnya yang akan digunakan juga akan mengacu pada buku, jurnal ilmiah, dan sumber lainnya. Untuk menyederhanakan simulasi, beberapa asumsi telah dibuat.

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As technology developed, drilling method has evolved from what was previously known as vertical drilling to directional drilling. Directional drilling exists to reach areas that are difficult to reach using conventional vertical drilling. While drilling is in operation, vibration often occurs, especially in the drill string. Drill string is a component that connects the rig and the drill bit. Typically, vibration is divided into three types, axial, lateral, and torsional. Torsional or “slip stick” vibrations are often considered as one of the most destructive modes of vibration. These vibrations can lead to failure or damage of drilling components which can result in financial and time losses for the company. Every single object vibrates at a natural frequency or rate of vibration. A drill string has many components that consist of several connections of pipe in a large dimension that each part of it has its natural frequencies. A drill string should also rotate far from its natural frequency or critical speed as it is the range of speed where it experiences severe vibration which can leads to drill string failure. The idea of this research paper is to make a drill string model and run a simulation of a drill string vibration in the well borehole while vertical and directional drilling is in operation. The vibration occurs due to contact between the drill string and well’s wall. The vibration that is observed in this research paper is limited to torsional vibration. The vibration analysis used is damped forced vibration analysis using finite element analysis with ANSYS simulation software. The finite element analysis is used to compute the natural frequency of the drill string as well as its mode shape, and to observe maximum stress and maximum deformation with variations of drill pipe’s length. These models can be used to represent and measure the damage of a drill string due to vibration. To make the simulation close to the actual situation, the input parameters for the modeling and simulation will be gathered from several scientific journals that already confirmed through experiments. Other additional input parameters that will be used will also refer to books, scientific journals, and other sources. To simplify the simulation, several assumptions have to be made."

"Kegiatan eksplorsi dan ekploitasi sudah dilakukan di dunia sudah sejak lama baik untuk pencarian minyak bumi maupun untuk dewatering (pemboran air). Usaha ini dilakukan untuk mencari cadangan minyak bumi di dalam bumi dan cadangan air di dalam bumi untuk kelangsungan hidup manusia dan sebagai penyumbang devisa. PT. Saripari Pertiwi Abadi merupakan salah satu penyedia jasa pemboran, baik pemboran minyak bumi yang biasa dilakukan di area Pekanbaru dan untuk pemboran dewatering sedang dilakukan di lokasi tambang PT. Newmont Nusa Tenggara, Nusa Tenggara Barat.Kegiatan dalam ekplorasi dan ekploitasi minyak bumi dan dewatering memiliki hazard dan risiko yang tinggi. Dalam melakukan eksplorasi, PT. Saripari Pertiwi Abadi menggunakan Rig untuk melakukan pemboran baik untuk minyak maupun untuk dewatering. Rig adalah suatu alat yang digunakan untuk melakukan pemboran sampai kedalaman tertentu yang memiliki kekuatan mulai dari 350 HP sampai dengan 2000 HP. Tahapan dalam kegiatan pemboran ialah mobilisasi peralatan, Rig up, setting rig, setting peralatan, pemasangan pipa pemboran, drilling, rig down. Dari seluruh kegiatan tersebut memiliki potensi hazard. Dari seluruh kegiatan dalam proses yang memiliki potensi timbulnya kecelakaan adalah proses pemasangan pipa pemboran hal ini disebabkan jumlah personil yang terlibat, tingkat keseringan kegitan pemasangan pipa, consequence yang ditimbulkan. Tahapan dari pemasangan pipa adalah pengambilan pipa dari gudang penyimpanan, persiapan pemasangan pipa dan proses akhir dari tahapan tersebut memiliki hazard seperti terpukul pipa, tergencet pipa, pipa terjatuh, kecelakaan lalu lintas, tersayat sling, tertimpa pipa, terpleset dan pecemaran lingkungan. Sehingga perlu dilakukan risk assesment dari kegiatan tersebut, untuk menentukan tindakan pengendalian dari hazard yang ada dalam proses tersebut.Tujuan dari penelitian ini adalah untuk mengetahui level of risk dari pekerjaan ini dan memberikan saran bagi pihak manajemen dalam melakukan pengendalian hazard. Metode dari penelitian ini adalah dengan menggunakan observasi langsung di lapangan dan tanya jawab kepada pekerja dan seorang yang ahli dalam operasi pemboran rig. Untuk melakukan identifikasi bahaya di lokasi pemboran digunakan metode Job Safety Analysis (JSA) dan untuk mengetahui level of risk dan analisa risiko digunakan metode analisis risiko kuantitatif AS/NZS (Australian Standard/New Zealand Standard) 4360. Setelah diketahui level of risk dari tahapan pemasangan pipa, maka dicari tindakan perbaikan yang efektif, efisien dan sesuai standard.Dari hasil penelitian ini dapat disimpulkan bahwa level of risk dari setiap proses pemasangan pipa adalah pangambila pipa bernilai 270 (priority 1), persiapan pemasangan pipa memiliki nilai 300 (priority 1), pemasangan pipa memiliki nilai 3000 (very high) dan proses akhir memiliki nilai level of risk 30 (priority 3)."

"Pada studi ini dilakukan suatu peninjauan kembali suatu prosedur perencanaan casing yang dilakukan pada salah satu sumur minyak/gas yang dimiliki oleh ConocoPhillips Indonesia Inc. Ltd. Perusahaan minyak dan gas umumnya selalu menggunakan casing dari grade yang tinggi untuk sumur-sumur yang dibor. Terdapat setidaknya tiga alasan utama mengapa selalu digunakan casing high grade untuk sumur-sumurnya antara lain adalah untuk menyederhanakan proses procurement (pembelian), untuk memaksimalkan aspek keamanan pada sumur-sumur yang dibor dan untuk menyederhanakan proses pada operasi pada pengeboran lepas pantai. Dampak terbesar dari digunakannya casing high grade ini adalah meningkatnya biaya untuk mengebor suatu sumur. Fungsi engineering diperlukan agar system casing yang digunakan tetap dalam safety factor yang sesuai dengan kebijakan keselamatan dari Migas dan dari perusahaan serta telah melalui proses kalkulasi yang optimal sehingga biaya yang dikeluarkan untuk sistem casing yang diaplikasikan tidak eksesif. Disain casing secara garis besar dipengaruhi oleh beberapa faktor antara lain: karakteristik batuan/formasi reservoir hidrokarbon yang dibor (tekanan pori dan tekanan rekah), mechanical properties dari casing itu sendiri (resistansi burst dan collapse serta pembebanan yang dialami oleh casing itu sendiri), dan kondisi/karakteristik lingkungan dari sumur (offshore dan onshore), serta kebijakan perusahaan dan Migas. Umumnya kebijakan perusahaan telah memiliki standar keselamatan yang lebih tinggi dari kebijakan Migas. Secara garis besar, terdapat 3 langkah proses optimasi yang dilakukan di sini sebagai berikut: review jumlah casing point menjadi minimum untuk mendapatkan jumlah wellbore section yang optimum; pemilihan grade casing berdasarkan beban burst, collapse, tension dan biaxial/triaxial; serta konsiderasi pengaruh dari environmental loads dan pengaruhnya terhadap pemilihan grade casing. Keluaran dari hasil studi ini adalah suatu disain casing pada suatu proyek pengeboran sumur minyak, terutama pengeboran yang dilakukan di laut dalam lepas pantai, baik itu adalah pengeboran satu sumur (single well drilling) maupun yang bersifat batch drilling, yang bersifat optimal, baik dari segi engineering, safety maupun biaya. Manfaat dari studi ini bagi penulis adalah sebagai sarana untuk mengembangkan diri dan memperluas wawasan dan pengetahuan, terutama yang berhubungan dengan perminyakan, struktural/civil engineering dan tentu saja aspek-aspek mekanikal dari sistem casing yang dirancang. Bagi pembaca, diharapkan studi ini dapat bermanfaat dalam memberikan wawasan yang lebih luas mengenai suatu disain casing dan tinjauannya secara komprehensif dari berbagai bidang ilmu terutama perminyakan, civil engineering dan juga perspektif mekanikal. Dan bagi masyarakat umum secara luas, studi ini diharapkan dapat memberikan kontribusi maksimal dalam proses pemanfaatan sumber daya alam yang dieksploitasi terutama sumber daya alam hidrokarbon (minyak dan gas).

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This study, conceptually reviewed a procedure of a casing disain that was done at one of oil/gas well that owned by ConocoPhillips Indonesia Inc. Ltd. Oil companies, at general practice always utilize casing that has high grade for their wells. There are at least three reasons why the high grade casings are often utilized in its wells: first is to simplify the procurement process, second is to maximize the safety aspect for the drilled wells and third is to simplify the operation process, especially for offshore wells.

The biggest effect from utilization of this high grade casing is the increased cost to drill a well. The engineering function is needed in order to engineer the casing system so that the system still within the safety factor with accordance to the government (Migas) policy and also company policy. This engineering process has been through an optimal calculation process so that the running cost spent for the applied casing system will not be excessive.

Casing design mainly is affected by factors such as: the characteristic of the rocks/formation from a hydrocarbon reservoir that will be drilled (pore pressure and frac pressure), casing?s mechanical properties (burst and collapse resistance and the loads that experienced by the casing) and the environmental loads and condition (offshore and onshore), and also the government and company policy. In general practice, company will has higher standard of safety. Basically, there are 3 steps of optimization, as follows: review the casing points into minimum in order to have optimum wellbore sections; casing grade selection based on burst load, collapse, tension and biaxial/triaxial; and also consideration of the effect of environmental loads and its effect to the casing grade selection.

Output from this study is a casing design at a particular oil-well drilling project, especially offshore, for single well or batch drilling, that fully optimized from engineering, safety and economy perspective. The main benefit from this study for the writer is the tool for self development and enrich the writer?s knowledge, especially the knowledge related to petroleum, structural/civil engineering and the mechanical aspects of the casing the already designed. For the readers, it is expected that this study will give wider knowledge related with casing design and its view comprehensively from various perspective especially petroleum engineering, civil/structural engineering and also mechanical engineering. And for the community and society in general, it is expected that this study will give maximum contribution in the process of natural resources utilization that was exploited, especially natural resources of hydrocarbon (oil and gas)."

"[Daerah prospek panas bumi Gunung Arjuno dan Gunung Welirang berada pada jalur vulkanik yang dikenal dengan jalur ring of fire, yaitu rentetan gunung api, baik yang aktif, maupun gunung api yang tidak aktif. Gunung tersebut berasosiasidengan pembentukan sistem panas bumi yang ditandai dengan kemunculan manifestasi yang terdiri dari mata air panas Padusan, Coban dan Cangar serta adanya fumarol yang terdapat di komplek Gunung Welirang. Dari hasil perhitungan geothermometer daerah prospek panas bumi Gunung Arjuno danGunung Welirang memiliki temperatur 250o C dan masuk dalam kategori high temperature (>225 oC). Untuk mengetahui batas, kedalaman, dan geometri dari reservoir yang ada, dilakukan pengukuran dengan metode Magnetotellurik (MT), Time Domain Electromagnetic (TDEM) dan gaya berat. Dari hasil pengukurantersebut, dilakukan pemodelan pada 138 data MT, 103 data TDEM dan 253 data gaya berat. Selanjutnya hasil pemodelan dianalisa dengan menggunakan penampang 1 dimensi, 2 dimensi dan visualisasi 3 dimensi. Karakteristik reservoir berada pada kisaran 10-30 Ohm-m dengan nilai densitas rata-rata 2.2gr/cc dan menghasilkan prospek panas Gunung Arjuno dan Gunung Welirang sekitar 40 km2 dengan potensi yang dapat dikembangkan untuk pembangkit tenaga listrik sebesar 140 MWe, rekomendasi penentuan titik bor eksplorasi berada di 2 km baratlaut dari komplek Gunung Welirang.

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The geothermal prospect areas Mount Arjuno and Mount Welirang is on track which is known as volcanic ring of fire, which is a series of volcanoes, both active and inactive volcanoes. The mountain is associated with the formation of geothermal systems that are characterized by the appearance of manifestations consisting of Padusan, Coban and Cangar hot springs and their fumaroles located

in Mount Welirang complex. From the calculation geothermometer, the geothermal prospect areas Mount Arjuno and Welirang has a temperature of 250°C and in the category of high temperature (190 oC-236 oC). To determine the

boundary, the depth, and the geometry of the existing reservoir, measured by the method of magnetotelluric (MT), Time Domain Electromagnetic (TDEM) and gravity. From the results of these measurements, modeling performed on the 138

MT data, 103 TDEM data and 253 gravity data. Furthermore, the modeling results were analyzed using 1 dimensional cross-section, 2 dimensional and 3 dimensional visualization. The position of the reservoir is in the range of 10-30 Ohm-m with an average density value 2.2 g/CC3 to generate hot prospects Mt.Arjuno and Mount Welirang approximately 40 km2. with potential developed for power plants of 140 MWe, recommendations exploration drill point

determination located at 3km north-west of the mountain complex Mount Welirang.;The geothermal prospect areas Mount Arjuno and Mount Welirang is on track

which is known as volcanic ring of fire, which is a series of volcanoes, both active

and inactive volcanoes. The mountain is associated with the formation of

geothermal systems that are characterized by the appearance of manifestations

consisting of Padusan, Coban and Cangar hot springs and their fumaroles located

in Mount Welirang complex. From the calculation geothermometer, the

geothermal prospect areas Mount Arjuno and Welirang has a temperature of

250°C and in the category of high temperature (190 oC-236 oC). To determine the

boundary, the depth, and the geometry of the existing reservoir, measured by the

method of magnetotelluric (MT), Time Domain Electromagnetic (TDEM) and

gravity. From the results of these measurements, modeling performed on the 138

MT data, 103 TDEM data and 253 gravity data. Furthermore, the modeling results

were analyzed using 1 dimensional cross-section, 2 dimensional and 3

dimensional visualization. The position of the reservoir is in the range of 10-30

Ohm-m with an average density value 2.2 g / CC3 to generate hot prospects

Mt.Arjuno and Mount Welirang approximately 40 km2. with potential developed

for power plants of 140 MWe, recommendations exploration drill point

determination located at 3km north-west of the mountain complex Mount

Welirang.;The geothermal prospect areas Mount Arjuno and Mount Welirang is on track

which is known as volcanic ring of fire, which is a series of volcanoes, both active

and inactive volcanoes. The mountain is associated with the formation of

geothermal systems that are characterized by the appearance of manifestations

consisting of Padusan, Coban and Cangar hot springs and their fumaroles located

in Mount Welirang complex. From the calculation geothermometer, the

geothermal prospect areas Mount Arjuno and Welirang has a temperature of

250°C and in the category of high temperature (190 oC-236 oC). To determine the

boundary, the depth, and the geometry of the existing reservoir, measured by the

method of magnetotelluric (MT), Time Domain Electromagnetic (TDEM) and

gravity. From the results of these measurements, modeling performed on the 138

MT data, 103 TDEM data and 253 gravity data. Furthermore, the modeling results

were analyzed using 1 dimensional cross-section, 2 dimensional and 3

dimensional visualization. The position of the reservoir is in the range of 10-30

Ohm-m with an average density value 2.2 g / CC3 to generate hot prospects

Mt.Arjuno and Mount Welirang approximately 40 km2. with potential developed

for power plants of 140 MWe, recommendations exploration drill point

determination located at 3km north-west of the mountain complex Mount

Welirang.;The geothermal prospect areas Mount Arjuno and Mount Welirang is on track

which is known as volcanic ring of fire, which is a series of volcanoes, both active

and inactive volcanoes. The mountain is associated with the formation of

geothermal systems that are characterized by the appearance of manifestations

consisting of Padusan, Coban and Cangar hot springs and their fumaroles located

in Mount Welirang complex. From the calculation geothermometer, the

geothermal prospect areas Mount Arjuno and Welirang has a temperature of

250°C and in the category of high temperature (190 oC-236 oC). To determine the

boundary, the depth, and the geometry of the existing reservoir, measured by the

method of magnetotelluric (MT), Time Domain Electromagnetic (TDEM) and

gravity. From the results of these measurements, modeling performed on the 138

MT data, 103 TDEM data and 253 gravity data. Furthermore, the modeling results

were analyzed using 1 dimensional cross-section, 2 dimensional and 3

dimensional visualization. The position of the reservoir is in the range of 10-30

Ohm-m with an average density value 2.2 g / CC3 to generate hot prospects

Mt.Arjuno and Mount Welirang approximately 40 km2. with potential developed

for power plants of 140 MWe, recommendations exploration drill point

determination located at 3km north-west of the mountain complex Mount

Welirang.;The geothermal prospect areas Mount Arjuno and Mount Welirang is on track

which is known as volcanic ring of fire, which is a series of volcanoes, both active

and inactive volcanoes. The mountain is associated with the formation of

geothermal systems that are characterized by the appearance of manifestations

consisting of Padusan, Coban and Cangar hot springs and their fumaroles located

in Mount Welirang complex. From the calculation geothermometer, the

geothermal prospect areas Mount Arjuno and Welirang has a temperature of

250°C and in the category of high temperature (190 oC-236 oC). To determine the

boundary, the depth, and the geometry of the existing reservoir, measured by the

method of magnetotelluric (MT), Time Domain Electromagnetic (TDEM) and

gravity. From the results of these measurements, modeling performed on the 138

MT data, 103 TDEM data and 253 gravity data. Furthermore, the modeling results

were analyzed using 1 dimensional cross-section, 2 dimensional and 3

dimensional visualization. The position of the reservoir is in the range of 10-30

Ohm-m with an average density value 2.2 g / CC3 to generate hot prospects

Mt.Arjuno and Mount Welirang approximately 40 km2. with potential developed

for power plants of 140 MWe, recommendations exploration drill point

determination located at 3km north-west of the mountain complex Mount

Welirang., The geothermal prospect areas Mount Arjuno and Mount Welirang is on track

which is known as volcanic ring of fire, which is a series of volcanoes, both active

and inactive volcanoes. The mountain is associated with the formation of

geothermal systems that are characterized by the appearance of manifestations

consisting of Padusan, Coban and Cangar hot springs and their fumaroles located

in Mount Welirang complex. From the calculation geothermometer, the

geothermal prospect areas Mount Arjuno and Welirang has a temperature of

250°C and in the category of high temperature (190 oC-236 oC). To determine the

boundary, the depth, and the geometry of the existing reservoir, measured by the

method of magnetotelluric (MT), Time Domain Electromagnetic (TDEM) and

gravity. From the results of these measurements, modeling performed on the 138

MT data, 103 TDEM data and 253 gravity data. Furthermore, the modeling results

were analyzed using 1 dimensional cross-section, 2 dimensional and 3

dimensional visualization. The position of the reservoir is in the range of 10-30

Ohm-m with an average density value 2.2 g / CC3 to generate hot prospects

Mt.Arjuno and Mount Welirang approximately 40 km2. with potential developed

for power plants of 140 MWe, recommendations exploration drill point

determination located at 3km north-west of the mountain complex Mount

Welirang.]"

"Proses pemboran migas dalam pelaksanaannya memiliki proses kontrak perjanjian kerja yang akan mempengaruhi kegiatan dari jasa pemboran menjadi pendapatan organisasi. Dalam tulisan ini, penulis melakukan penelitian tentang proses bisnis yang terjadi pada organisasi jasa pengeboran di lini pendapatan, seperti pembuatan dokumen penagihan untuk pekerjaan yang dilakukan. Kami memvalidasi kesetaraan kriteria informasi dengan ahli dalam administrasi jasa pengeboran dengan kriteria informasi dalam administrasi publik. Dijelaskan juga proses bisnis yang terjadi dan perbandingan durasi proses pada standar jasa pemboran dengan proses realisasi juga untuk mengidentifikasi masalah dan menentukan kemungkinan pengembangan proses bisnis dengan BPR. Penelitian ini menghasilkan alternatif proses bisnis yang memiliki perubahan pada area proses bisnis yang berbeda-beda, diantaranya perubahan proses bisnis internal perusahaan, proses bisnis eksternal perusahaan atau proses bisnis pada klien, dan penggabungan antara proses bisnis internal dengan eksternal. Dari alternatif-alternatif tersebut didapatkan proses bisnis To-Be yang lebih efisien yang dihasilkan dari perbandingan alternatif-alternatif tersebut dengan manajemen risiko dan Analytical Hierarchy Process - Technique for Order Preference by similiarity to ideal solution.

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The oil and gas drilling process in its implementation has a contractual agreement process that will affect the activities of drilling services into organizational income. In this paper, the author conducts research on the business processes that occur in drilling services in the revenue line, such as making billing documents for the work done. We validated the question of information criteria with experts in drilling services administration with information criteria in public administration. It also explained the business processes that occurred and the comparison of the duration of the standard drilling service process with the realization process as well as to identify problems and determine the possibility of developing business processes with BPR. This research produces alternative business processes that have changes in different business processes, including changes to the company's internal business processes, the company's external business processes or business processes to clients, and the merger between internal and external business processes. From these alternatives, a more efficient To-Be business process was obtained resulting from the comparison of these alternatives with risk management and Analytical Hierarchy Process - Technique for Order Preference by similarity to ideal solution"