Path: TopS2-ThesesPetroleum Engineering-FTTM2010

KARAKTERISASI RESERVOIR BERDASARKAN INTERPRETASI DRILL STEM TEST DENGAN APLIKASI INTERVAL DIFERENSIASI DERIVATIF TEKANAN

DRILL STEM TEST INTERPETATION IN RESERVOIR CHARACTERIZATION USING PRESSURE DERIVATIVE METHOD WITH DIFFERENTIATION INTERVAL

Undergraduate Theses from JBPTITBPP / 2017-09-27 15:07:43
Oleh : M. RULLY CHAERUL SHOBAR (NIM : 22208048), S2 - Petroleum Engineering
Dibuat : 2017-06-02, dengan 8 file

Keyword : karakterisasi reservoir, DST, dan derivatif tekananv

Reservoir X1 dan X2 yang berada dalam tahap awal eksploitasi hendak dikaji dalam prospek kandungan minyak dan fisibilitas produksi. Untuk memperoleh informasi lebih banyak tentang reservoir tersebut, maka Drill Stem Test (DST) dilangsungkan.



Tujuan penelitian adalah melakukan karakterisasi dan deskripsi reservoir X1 dan X2 berdasarkan interpretasi data drill stem test. Parameter reservoir yang hendak ditentukan adalah tekanan inisial formasi pi, permeabilitas efektif formasi k, faktor skin s, dan batas reservoir. Pendekatan yang digunakan dalam interpretasi data pengujian sumur adalah metode interpretasi berdasarkan perilaku derivatif tekanan dengan aplikasi interval diferensiasi numerik, superposisi dalam multi-rate testing, dan metode Horner . Pengujian dilakukan terhadap reservoir pada interval 1802 – 1818 ftKB dan 1832 – 1850 ftKB serta reservoir X2 pada interval 1513 – 1523 ftKB dan interval 1940 - 1948 ftKB. Interval diferensiasi yang digunakan dalam plot derivatif tekanan adalah sebesar 0,2 siklus log.



Interpretasi menunjukkan bahwa reservoir X1 pada interval 1832 - 1850 ftKB memiliki k = 104,95 - 125,49 md , pi =807,9 psia, s = 2,09 - 3,59 dan 1802 - 1818 ftKB memiliki k = 1462,46 - 1730,25 md, pi = 685 - 687 psia, s = 9,82 - 13,36. Kedua interval memproduksikan minyak dan sedikit gas serta memiliki batas alir berupa constant pressure boundary berbentuk linier. Reservoir X2 pada interval 1513 - 1523 ftKB memproduksi air dan sedikit gas, interval 1940 - 1948 ftKB memiliki k = 29,61 - 31,17 md, pi = 700 psia, s = - 2,99 hingga -2,92. Interpretasi berdasarkan perilaku derivatif tekanan mendeteksi adanya patahan semi-permeabel di reservoir X2. Volume pori kedua reservoir tidak dapat diperkirakan karena rejim aliran selama pengujian masih berada dalam rejim aliran transien.

Deskripsi Alternatif :

X1and X2 reservoirs were in early phase of hydrocarbon field exploitation, several tests had been conducted to evaluate their hydrocarbon prospects and production feasibility. Drill stem tests were performed to get more information about the reservoirs.



Objective of this study is to characterize and describe X1 and X2 reservoirs based on DST data. Several parameters to be determined are formation initial pressure pi, effective permeability k, skin factor s, and reservoir boundaries. The approach of analysis in well test interpretation uses pressure derivative method developed by Bourdet applying difference interval of numerical computation in plotting pressure derivative, superposition principle, and Horner’s method. The tests were conducted on interval 1802 – 1818 ftKB and 1832 – 1850 ftKB of X1 reservoir, also on interval 1513 – 1523 ftKB and 1940 – 1948 ftKB of X2 reservoir. The difference interval that used was 0.2 log cycle.



Interpretation results show X1 reservoir at 1802 - 1818 ftKB has k = 146.,46 - 1730.25 md, pi = 685 - 687 psia, s = 9.82 - 13.36. And, at interval 1832 - 1850 ftKB, X1 reservoir has k = 104.95 - 125.49 md , pi =807.9 psia, s = 2.09 - 3.59 . These both intervals produce oil and small quantity of gas. The reservoir is located adjacent to some linear constatnt pressure boundary. X2 reservoir at 1513 - 1523 ftKB produces water and small quantity of gas. And, at interval 1940 - 1948 ftKB, the reservoir has 29.61 - 31.17 md, pi = 700 psia, s = - 2.99 up to -2.92 . Pressure derivative analysis on X2 reservoir detects a semi-permeable fault within it. Liquid pore volume cannot be determined since the flow regime on the tests were in transient period.

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