Acid Fracturing Technology for High-conductivity Unpropped  Fractures in Ultra-deep Wells with High Temperature in Carbonate Reservoirs

doi:10.3969/j.issn.1006-6535.2022.03.021

Abstract

Abstract: In response to the problems of easy closure of acid-etched fractures and rapid attenuation of conductivity caused by acid fracturing in ultra-deep wells, a new acid-fracturing shielding protectant was synthesized and evaluated for its key indicators such as self-agglomeration, oil solubility and adhesion. This technology blocks the acid-rock reaction by discontinuously and temporarily shielding the surface of the hydraulic fracture, and realizes the transformation of acid-etched fractures from point support to surface support, and the effective support height of the fracture can be increased by 3 times. CFD software simulation was used to optimize the distribution pattern of shielding protective agent particles in the fractures and to determine the process parameters such as shielding protective agent dosage, injection and displacement rates, and carrier fluid type. The technology was applied to ultra-deep wells with high temperature in Tahe Oilfield. The results after fracturing showed that the adhesion and oil solubility of shielding agent at formation temperature met the design requirements, and the conductivity and service life of unpropped fractures were significantly prolonged. This technology plays an important role in the improvement of acid fracturing effect in ultra-deep wells.

Key words: acid-etched fractures, shielding and protective agent, conductivity, ultra-deep wells, self-supporting

CLC Number:

TE355.5

Zhou Linbo, Liu Honglei, Li Dan, Zhang Junjiang, Zhou Jun. Acid Fracturing Technology for High-conductivity Unpropped Fractures in Ultra-deep Wells with High Temperature in Carbonate Reservoirs[J]. Special Oil & Gas Reservoirs, 2022, 29(3): 144-149.

References

[1] 米尔卡 J 埃克诺米德斯,肯尼斯 G 诺尔特.油藏增产措施[M].3版.张保平,蒋阗,刘立云,等译.北京:石油工业出版社,2002:402-403.
ECONOMIDES M J,NOLTE K G.Reservoir Stimulation[M].3rd ed.Translated by ZHANG Baoping,JIANG Tian,LIU Liyun,et al.Beijing:Petroleum Industry Press,2002:402-403.
[2] 丁云宏.难动用储量开发压裂酸化技术[M].北京:石油工业出版社,2005:97-98.
DING Yunhong.Fracturing and acidizing technology for the development of difficult-to-use reserves[M].Beijing:Petroleum Industry Press,2005:97-98.
[3] 龚蔚.深层裂缝型碳酸盐岩油藏水平井水力喷射酸压技术[J].断块油气田,2020,27(6):808-811.
GONG Wei.Hydrajet acid fracturing technique of horizontal well in deep fractured carbonate reservoir[J].Fault-Block Oil & Gas Field,2020,27(6):808-811.
[4] KALFAYAN L J.Fracture acidizing:history,present state and future[C].SPE106371,2007:1-7.
[5] 刘学伟.页岩储层水力压裂支撑裂缝导流能力影响因素[J].断块油气田,2020,27(3):394-398.
LIU Xuewei.Influencing factors of hydraulic propped fracture conductivity in shale reservoir[J].Fault-Block Oil & Gas Field,2020,27(3):394-398.
[6] 周林波,宋志峰,张俊江,等.MX井深层白云岩储层非均匀酸化压裂技术[J].特种油气藏,2017,24(6):161-164.
ZHOU Linbo,SONG Zhifeng,ZHANG Junjiang,et al.Non-uniform acid fracturing technology for deep dolomite reservoir in Well MX[J].Special Oil & Gas Reservoirs,2017,24(6):161-164.
[7] 梁天成,才博,蒙传幼,等.水力压裂支撑剂性能对导流能力的影响[J].断块油气田,2021,(3):403-407.
LIANG Tiancheng,CAI Bo,MENG Chuanyou,et al.The effect of proppant performance of hydraulic fracturing on conductivity[J].Fault-Block Oil & Gas Field,2021,(3):403-407.
[8] 车明光,袁学芳,范润强,等.酸蚀裂缝导流能力实验与酸压工艺技术优化[J].特种油气藏,2014,21(3):120-124.
CHE Mingguang,YUAN Xuefang,FAN Runqiang,et al.Test of acid etched fracture conductivity and optimization of acid fracturing[J].Special Oil & Gas Reservoirs,2014,21(3):120-124.
[9] 牟建业,张士诚.酸压裂缝导流能力影响因素分析[J].油气地质与采收率,2011,18(2):69-71.
MU Jianye,ZHANG Shicheng.Influence factor analysis on acid pressure rips diversion capacity[J].Petroleum Geology and Recovery Efficiency,2011,18(2):69-71.
[10] 姚茂堂,牟建业,李栋,等.高温高压碳酸盐岩地层酸蚀裂缝长期导流能力实验研究[J].科学技术与工程,2015,15(2):193-195.
YAO Maotang,MU Jianye,LI Dong,et al.An experimental study of fracture long-term conductivity in high temperature and pressure carbonate formation[J].Science Technology and Engineering,2015,15(2):193-195.
[11] 周林波. 高导流自支撑酸化压裂室内实验研究[J].特种油气藏,2017,24(4):152-155.
ZHOU Linbo.Laboratory experimental research on high conductivity self-supporting acid fracturing[J].Special Oil & Gas Reservoirs,2017,24(4):152-155.
[12] 中国国家标准化管理委员会.沥青软化点测定法环球法:GB/T 4507—2014[S].北京:中国标准出版社,2014:1-6.
Standardization Administration of the P.R.C.Standard test method for softening point of bitumen-ring-and-ball apparatus:GB/T 4507—2014[S].Beijing:Standards Press of China,2014:1-6.
[13] 钱战森,张劲柏,李椿萱.基于预处理的不可压缩N-S方程拟压缩数值算法研究[J].中国科学:物理学、力学、天文学,2010,40(12):1542-1554.
QIAN Zhansen,ZHANG Jinbai,LI Chunxuan.Study on numerical algorithm of quasi-compression of incompressible n-s equation based on preprocessing[J].Scientia Sinica Physica,Mechanica & Astronomica,2010,40(12):1542-1554.
[14] 刘建坤,吴峙颖,吴春方,等.压裂液悬砂及支撑剂沉降机理实验研究[J].钻井液与完井液,2019,36(3):378-383.
LIU Jiankun,WU Zhiying,WU Chunfang,et al.Experiment study on the mechanisms of sand suspension and settling of proppant in fracturing fluids[J].Drilling Fluid & Completion Fluid,2019,36(3):378-383.
[15] 王兴文,郭建春,赵金洲,等.碳酸盐岩储层酸化(酸压)技术与理论研究[J].特种油气藏,2004,11(4):67-69.
WANG Xingwen,GUO Jianchun,ZHAO Jinzhou,et al.Acidizing (acid fracturing) technique and theoretical study for carbonate reservoir[J].Special Oil & Gas Reservoirs,2004,11(4):67-69.
[16] 伊向艺.碳酸盐岩储层交联酸酸压技术研究与应用[D].成都:成都理工大学,2006:55-62.
YI Xiangyi.Research and application of acid fracturing technology of crosslinked acid fluid on carbonate reservoirs[D].Chengdu:Chengdu University of Technology,2006:55-62.
[17] 张波,薛承瑾,周林波,等.多级酸压在超深裂缝型碳酸盐岩水平井的应用[J].新疆石油地质,2013,34(2):232-235.
ZHANG Bo,XUE Chengjin,ZHOU Linbo,et al.Application of multistage acid fracturing technology for horizontal well to ultra-deep fractured carbonate reservoirs[J].Xinjiang Petroleum Geology,2013,34(2):232-235.
[18] JIANIERODE D E,KRUK K F.An evaluation of acid fluid loss additives retarded acids and acidized fracture conductivity[C].SPE4549,1973:1-7.

Acid Fracturing Technology for High-conductivity Unpropped Fractures in Ultra-deep Wells with High Temperature in Carbonate Reservoirs

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