بررسی و بهبود عملیات انگیزش چاه با اسیدکاری ماتریکسی در یک مخزن نفتی جنوب ایران

نوع مقاله: مقاله پژوهشی

چکیده

عملیات انگیزش توسط اسیدکاری به منظور افزایش تولید یا تزریق‌پذیری چاه‌های نفت و گاز تولیدی و یا متروک شده در مخازن نفت جنوب ایران به طور گسترده‌ای انجام می‌شود که عمده‌ترین عملیات انگیزش، نوع ماتریکس اسید می‌باشد. این نوع عملیات اسیدکاری جهت بهبود نفوذپذیری و رسیدن به یک پوستۀ منفی انجام می‌گیرد. هدف از این مقاله بررسی این نوع عملیات اسیدکاری و ارائه راهکارهایی جهت بهبود این عملیات در تعداد 9 حلقه چاه در یکی از مخازن نفتیِ جنوب ایران می‌باشد. نتایج بهره‌برداری بعد از اسیدکاری در میدان مورد مطالعه نشان دهندۀ عدم کارایی اغلب این عملیات می‌باشد. در این مقاله بعد از مقدمه، تاریخچۀ عملیات ماتریکس اسید در بعضی از میادین جنوب ایران در سال‌های اخیر نشان داده شده است. ارزیابی اسیدکاری در مراحل قبل و بعد از عملیات انگیزشی در 9 حلقه چاه با استفاده از نرم‌افزار Pansys و انجام آنالیز گرهی آنها توسط نرم‌افزار Pipesim، بخش نتایج این مقاله را به خود اختصاص می‌دهد. با استفاده از نتایج حاصل و بررسی تاریخچه عملیات اسیدکاری در میدان مورد مطالعه با پیشینۀ تحقیق و کارهای مشابه انجام شده در میدان مورد مطالعه و نیز میدان‌های مشابه دیگر، ارزیابی عملیات اسیدکاری در بخش بحث و تفسیر مطالب به تفصیل آورده شده است. نتایج حاصله بیانگر این است که از میان 9 حلقه چاه مورد مطالعه فقط چاه‌های 20، 22 و 38 مناسب‌ترین کاندیدها جهت عملیات اسیدکاری ماتریکسی هستند. در انتها، به‌دلیل معظلات موجود در روش اسیدکاری ماتریکسی، بکارگیری روش شکافت هیدرولیکی در مخازن ایران یکی از پیشنهادهای ارائه شده در این مقاله است.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation and Improvement of Well Stimulation by Matrix Acidizing in one of the Southern Iranian Oilfields

چکیده [English]

Well stimulation by means of acidizing has been extensively conducted for enhancing the productivity or injectability of producing and/or abandoned wells in southern Iranian oilfields, and matrix acidizing is considered as the major stimulation method in this region. Permeability improvement and consequently reaching a negative skin is the main objective of this type of stimulation. The aim of this research is to evaluate the performance of the carried out matrix acidizing and put forward some alternative methods to improve this kind of operation. The post production results of acidizing show an inefficient outcome of the majority of these operation in the investigated oilfield. The history of performed matrix acidizing operation in some of the southern Iranian oilfields in recent years has been introduced in this study. By employing Pansys software, the evaluation of pre and post stimulation jobs has been applied to nine wells. Also, Nodal analysis has been performed by Pipesim software in the investigated oil wells to study the production systems of these nine oil wells. By utilization of the results of this study and assessment the literature review of the related studies, matrix acidizing operation will be discussed in detail in this paper. The results show that among the nine oil wells studied in this research, wells 20, 22, and 38 are the best candidate for matrix acidizing operation. Finally because of the associated difficulties with matrix acidizing and in order to bypass various types of formation damage, the authors of this paper recommend Iranian upstream industry to considering Hydraulic Fracturing operation as a replacement stimulation method.

کلیدواژه‌ها [English]

  • Well Stimulation
  • Matrix Acidizing
  • Well Test
  • Nodal Analysis
منابع

[1] McLeod H.O. & Coulter A.W., “The Stimulation treatment pressure record-an overlooked formation evaluation tool”, J. Petroleum Technol. Vol. 21, pp. 951-960, 1969.

[2] Xiong H. & Holditch S. “A Comprehensive approach of formation damage diagnosis and corresponding stimulation type and fluid selection”, paper SPE 29531, 1995.

[3] Mach J., Proano E., & Brown K.E., “A Nodal approach for applying systems analysis to the flowing and arti-ficial lift oil or gas well”, paper SPE 8025, 1979.

[4] Zoveidavianpoor M. & Shadizadeh S.R., “Production optimization of oil and gas Wells: a Review of nodal analysis application”, Exploration & Production, Vol. 67, pp. 67-72, 2010.

[5] McLeod H.O., “Significant factors for successful matrix acidizing”, paper NMT 890021, presented at the Centennial Symposium Petroleum Technology into the Second Century, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA, October 16-19, 1989.

[6] Brill J.P. & Beggs H.D., Two-phase flow in pipes, INTERCOMP Course, The Hague, 1974.

[7] Duns, H. & Ros, N.C.J., Vertical flow of gas and liquid mixtures in wells, Proceedings of the 6th World Petroleum Congress, Tokyo, 1963.

[8] Hagedorn A.R. & Brown K.E., “Experimental study of pressure gradients occurring during continuous two phase flow in small-diameter conduits”, J. Petroleum Technol., 1965.

[9] Orkizewski J., “Predicting Two-Phase pressure drops in vertical pipes”, JPT, 1967.

[10] Kartoatmodjo G., Caretta F., Flew S., & Jadid M., “Risk-Based candidate selection workflow improve acid stimulation success ratio in mature field”, paper SPE 109278. 2007.

[11] Paccaloni G., “New method proves value of stimulation planning”, oil & gas Journal, Vol. 77, pp. 155-160. 1979.

[12] Wayne P. Mitchell, Dario Stemberger, & A.N. Martin, “Is Acid Placement Through Coiled Tubing Better Than Bullheading?”, SPE 81731, 2003.

[13] Taylor D.B. & Plummer R.A., “Gas well stimulation using coiled tubing with a mutual solvnet”, paper SPE 4115, prepared for the 47th Annual Fall Meeting of the SPE, San Antonio, TX, Oct 1972.

[14] Thomas R.L. & Milne A., “The use of coiled tubing during matrix acid stimulation of carbonate reservoirs”, paper SPE 29266, presented at the SPE Asia Pacific Oil and Gas Conference, Kuala Lumpur, Malaysia, March 1995.

[15] Garrouch A. & Malallah A.H., “An empirical model for predicting crude sludging potential caused by acidizing”, International Journal of Petroleum Science and Technology, Vol. 1, No. 1, pp. 23–36, 2007.

[16] Shadizadeh S.R. & Zoveidavianpoor M., Environmental impacts of xylene as stimulation fluid in iranian oil and gas wells. Shiraz University, 2008.

[17] Houchin L.R. & Hudson L.M., “The Prediction, evaluation, and treatment of formation damage caused by organic deposition”, paper SPE 14818 presented at the 7th SPE Symposium on Formation Damage Control of SPE, Lafayette. Louisiana, 1986.

[18] Saxon A. & Rahman M.R.A., An effective matrix diversion technique for carbonate formations, Abu Dhabi Co., 2000.

[19] Erbstoesser S.R., “Improved ball sealer diversion”, J. Petroleum Technol., pp. 1903-1910, 1980.

[20] Montgomery C.T., Jan Y. M. & and Niemeyer B.L., “Development of a matrix acidizing stimulation treatment evaluation and recording system”, SPEPF, 219, 1995.

[21] Paccaloni G., “A New effective matrix stimulation diversion technique”, SPEPF, pp. 151-156, 1995.

[22] Economides M.J. & Frick T.P., “Optimization of horizontal well matrix treatments”, SPEPF, pp. 93-99, 1994.

[23] Economies M.J. & Nolte KG., Reservoir stimulation, 2nd edition, Prentice Hall, Eaglewood Clifffs, NJ, 1988.

[24] Schlager B.A. & Frick T.P., “Real time monitoring and analysis of matrix stimulation operation”, paper SPE 31104, Resources engineering systems Inc.: STIMPRO Manual Resources Engineaing systems Inc., Cambridge MA 1995.

[25] McLeod, Harry O., “Significant factors for successful matrix acidizing”, SPE- 20155.

[26] Shadizadeh S.R. & Zoveidavianpoor M., “A Successful experience in optimization of a production well in a southern iranian oil field”, IJChE, Vol. 6, No. 2, 2009.

[27] Shadizadeh S.R. & Zoveidavianpoor M., “Study reviews Iran, world well cementing practices”, Oil & Gas Journal, Vol. 108, Issue 22, 2010.

[28] Tavassoli M., Ranjbar M. & Movaheddinian A., “Investigation of the reasons of acidizing failure in carbonate formation of Ahwaz field”, 3rd Mining Engineering Conference, Kerman, pp. 401-409, 2003.