Special Oil & Gas Reservoirs >

2023 , Vol. 30 >Issue 6: 157 - 164

DOI: https://doi.org/10.3969/j.issn.1006-6535.2023.06.021

Drilling & Production Engineering

Research and Application of Changing Rule of Fracture Flow Conductivity in Salt-Bearing Reservoirs Based on Salt Dissolution and Creep

  • Yu Tianxi ,
  • Wang Lei ,
  • Chen Beibei ,
  • Sun Xize ,
  • Li Shengxiang ,
  • Zhu Zhenlong
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  • 1. PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China;
    2. School of Petroleum Engineering, Yangtze University, Wuhan, Hubei 430100, China;
    3. Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering, Wuhan, Hubei 430100, China

Received date: 2022-10-07

  Revised date: 2023-09-05

  Online published: 2024-01-19

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Abstract

The rapid decline of fracture flow conductivity after fracturing of salt-bearing reservoirs leads to the rapid decline of production, so the enhancement of fracture flow conductivity becomes the key to improve the development effect of this type of reservoir. By taking the salt-bearing reservoir in Mahu area of Junggar Basin as the research object, and based on the mineral component data of the reservoir, the salt content of the reservoir was classified, and based on this, the creep performance of the reservoir and the dissolution law of the salt rock, as well as the influence of the proppant particle size, the sanding concentration, and the fluid medium on the flow conductivity were investigated, and the effects of the creep effect of the reservoir, the salt dissolution effect, and the embeddedness of the proppant on the fracture width were quantitatively analyzed. The study shows that: The higher the salt mineral content of the salt rock, the more obvious the characteristics of its creep mechanical behavior; the higher the temperature, the lower the fluid mineralization and viscosity, and the higher the rate of salt dissolution; the fracture width is mainly affected by the embedment effect of the proppant, the creep effect of the salt-bearing reservoir and the salt dissolution effect on the fracture surface, and the embedment effect of the proppant and the creep effect of the salt-bearing reservoir lead to a decrease in the fracture width, and the fracture width increases due to the dissolution effect of the salt rock on the fracture surface. The fracturing fluid and high-concentration, large-size proppant prepared by using clear water can significantly enhance the fracture conductivity. The research results have been successfully tested in the field and show the direction for efficient fracturing of salt-bearing reservoirs.

Key words： salt-bearing reservoir; creep; salt dissolution; fracture conductivity; proppant; Mahu; Junggar Basin

Cite this article

Yu Tianxi , Wang Lei , Chen Beibei , Sun Xize , Li Shengxiang , Zhu Zhenlong . Research and Application of Changing Rule of Fracture Flow Conductivity in Salt-Bearing Reservoirs Based on Salt Dissolution and Creep[J]. Special Oil & Gas Reservoirs, 2023 , 30(6) : 157 -164 . DOI: 10.3969/j.issn.1006-6535.2023.06.021

References

[1] 郝丽华,甘仁忠,潘丽燕,等. 玛湖凹陷风城组页岩油巨厚储层直井体积压裂关键技术[J].石油钻探技术,2021,49(4):99-105.
HAO Lihua,GAN Renzhong,PAN Liyan,et al.Key technology of volumetric fracturing in vertical wells of hugely thick shale oil reservoirs in the Fengcheng Formation of the Mahu Sag[J].Petroleum Drilling Techniques,2021,49(4):99-105.
[2] 任永琳,王达,冯浦涌,等.碳酸盐岩储层机械转向酸化酸压技术最新研究进展[J].非常规油气,2022,9(5):1-8.
REN Yonglin,WANG Da,FENG Puyong,et al.Latest research progress of carbonate formation mechanical diversion stimulation technology[J].Unconventional Oil & Gas,2022,9(5):1-8.
[3] 肖长富,阳友奎,吴刚,等.岩盐溶解特性及其传质过程的研究[J].重庆大学学报(自然科学版),1993,16(2):51-57.
XIAO Changfu,YANG Youkui,WU Gang,et al.The dissolution characteristics of rock salt and mass transmission process[J].Journal of Chongqing University(Natural Science Edition),1993,16(2):51-57.
[4] 梁卫国,李志萍,赵阳升.盐矿水溶开采室内实验的研究[J].辽宁工程技术大学学报,2003,22(1):54-57.
LIANG Weiguo,LI Zhiping,ZHAO Yangsheng.Research on indoor experiments of water-soluble mining in salt mines[J].Journal of Liaoning Technical University,2003,22(1):54-57.
[5] 姜德义,王春荣,任松,等.岩盐溶解速率影响因素的实验[J].重庆大学学报,2012,35(9):126-130.
JIANG Deyi,WANG Chunrong,REN Song,et al.Experiments of the influencing factors on dissolution rate of rock salt[J].Journal of Chongqing University,2012,35(9):126-130.
[6] 邱贤德,姜永东,张兰.岩盐流变特性与卸荷损伤本构关系研究[J].中国井矿盐,2003,34(4):21-23,31.
QIU Xiande,JIANG Yongdong,ZHANG Lan.Study on rheological characteristics and unloading damage constitutive relationship of rock salt[J].China Well and Rock Salt,2003,34(4):21-23,31.
[7] 高小平,杨春和,吴文,等.盐岩蠕变特性温度效应的实验研究[J].岩石力学与工程学报,2005,24(12):2054-2059.
GAO Xiaoping,YANG Chunhe,WU Wen,et al.Experimental studies on temperature dependent properties of creep of rock salt[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(12):2054-2059.
[8] 郤保平,徐素国,赵延林,等.盐岩夹层蠕变特性实验研究与理论分析[J].太原理工大学学报,2006,37(2):123-126.
XI Baoping,XU Suguo,ZHAO Yanlin,et al.Experimental study and theoretic analysis on creep property of rock salt interlayer[J].Journal of Taiyuan University of Technology,2006,37(2):123-126.
[9] 李江,陈先超,高平,等.考虑应力敏感效应的裂缝性碳酸盐岩气井拟稳态产能预测方法[J].石油钻探技术,2021,49(3):111-116.
LI Jiang,CHEN Xianchao,GAO Ping,et al.A pseudo-steady-state productivity prediction method for fractured carbonate gas wells considering stress-sensitivity effects[J].Petroleum Drilling Techniques,2021,49(3):111-116.
[10] 姜浒,陈勉,张广清,等.碳酸盐岩储层加砂酸压支撑裂缝短期导流能力实验[J].中国石油大学学报(自然科学版),2009,33(4):89-92.
JIANG Hu,CHEN Mian,ZHANG Guangqing,et al.Experiment on short-term conductivity of sand-adding acid-fracturing propping fractures in carbonate reservoir[J].Journal of China University of Petroleum(Edition of Natural Sciences),2009,33(4):89-92.
[11] 谢关宝,滕春鸣,柳华杰.盐岩蠕变对水泥环气密封完整性影响规律研究[J].石油钻探技术,2022,50(2):78-84.
XIE Guanbao,TENG Chunming,LIU Huajie.Study on the influence of salt rock creep on the integrity of cement sheath gas seals[J].Petroleum Drilling Techniques,2022,50(2):78-84.
[12] 周少伟,高伟,祖凯,等.致密碳酸盐岩储层水力加砂支撑裂缝导流能力实验研究[J].油气地质与采收率,2016,23(4):117-121.
ZHOU Shaowei,GAO Wei,ZU Kai,et al.An experimental research on flow conductivity of propped fracture by hydraulic sand fracturing in tight carbonate gas reservoirs[J].Petroleum Geology and Recovery Efficiency,2016,23(4):117-121.
[13] 李虹,于海洋,杨海烽,等.裂缝性非均质致密储层自适应应力敏感性研究[J].石油钻探技术,2022,50(3):99-105.
LI Hong,YU Haiyang,YANG Haifeng,et al.Adaptive stress sensitivity study of fractured heterogeneous tight reservoir[J].Petroleum Drilling Techniques,2022,50(3):99-105.
[14] 赵立强,高俞佳,袁学芳,等.高温碳酸盐岩储层酸蚀裂缝导流能力研究[J].油气藏评价与开发,2017,7(1):20-26.
ZHAO Liqiang,GAO Yujia,YUAN Xuefang,et al.Research on flow conductivity of acid etched fracture of carbonate reservoir under high temperature[J].Reservoir Evaluation and Development,2017,7(1):20-26.
[15] 咸玉席,陈超峰,封猛,等.页岩油藏裂缝网络多相渗流数值模拟研究[J].石油钻探技术,2021,49(5):94-100.
XIAN Yuxi,CHEN Chaofeng,FENG Meng,et al.Numerical simulation of multiphase flow in fracture networks in shale oil reservoir[J].Petroleum Drilling Techniques,2021,49(5):94-100.
[16] 张楠.层状盐岩储油库围岩力学和渗透特性及安全评价研究[D].重庆:重庆大学,2019.
ZHANG Nan.Study on mechanical and permeability characteristics and safety evaluation of surrounding rocks of layered salt rock oil reservoirs[D].Chongqing:Chongqing University,2019.
[17] 袁征,黄杰,袁文奎,等.压裂裂缝长期导流能力衰退规律实验研究[J].非常规油气,2022,9(3):78-82,102.
YUAN Zheng,HUANG Jie,YUAN Wenkui,et al.Experimental study on long term conductivity decline of hydraulic fracturing fracture[J].Unconventional Oil & Gas,2022,9(3):78-82,102.
[18] 田灏.流体作用下盐间页岩地层蠕变规律及套管变形机理研究[D].北京:中国石油大学(北京),2020.
TIAN Hao.Research on creep law and casing deformation mechanism of inter-salt shale formation under fluid action[D].Beijing:China University of Petroleum(Beijing),2020.
[19] 李凤霞,黄志文,纪国法,等.缝网结构与流体对页岩导流能力影响的实验研究[J].非常规油气,2021,8(6):40-45.
LI Fengxia,HUANG Zhiwen,JI Guofa,et al.Experimental study on the influence of shale fracture network structure and fluid on conductivity[J].Unconventional Oil & Gas,2021,8(6):40-45.
[20] 贾志伟,程长坤,朱秀雨,等.青海油田尕斯N1-N21超高盐油藏复合驱提高采收率技术[J].石油钻探技术,2021,49(5):81-87.
JIA Zhiwei,CHENG Changkun,ZHU Xiuyu,et al.Oil recovery enhancement by composite flooding technology for Gasi N1-N21 ultra-high-salinity reservoir in Qinghai Oilfield[J].Petroleum Drilling Techniques,2021,49(5):81-87.
[21] 王军保,刘新荣,郭建强,等.盐岩蠕变特性及其非线性本构模型[J].煤炭学报,2014,39(3):445-451.
WANG Junbao,LIU Xinrong,GUO Jianqiang,et al.Creep properties of salt rock and its nonlinear constitutive model[J].Journal of China Coal Society,2014,39(3):445-451.
[22] 陈锋,李银平,杨春和,等.云应盐矿盐岩蠕变特性实验研究[J].岩石力学与工程学报,2006,25(增刊):3022-3027.
CHEN Feng,LI Yinping,YANG Chunhe,et al.Experimental study on creep behaviors of rock salt in Yunying salt mine[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(S):3022-3027.
[23] 吴池,刘建锋,周志威,等.含杂质盐岩三轴蠕变特性实验研究[J].工程科学与技术,2017,49(增刊2):165-172.
WU Chi,LIU Jianfeng,ZHOU Zhiwei,et al.Study on creep properties of salt rock with impurities during triaxial creep test[J].Advanced Engineering Sciences,2017,49(S2):165-172.
[24] JIN Jishan,CRISTESCU N D.An elastic/viscoplastic model for transient creepof rock salt[J].International Journal of Plasticity,1998,14(1):85-107.
[25] 唐明明,王芝银,丁国生,等.含夹层盐岩蠕变特性实验及其本构关系[J].煤炭学报,2010,35(1):42-45.
TANG Mingming,WANG Zhiyin,DING Guosheng,et al.Creep property experiment and constitutive relation of salt-mudstone interlayer[J].Journal of China Coal Society,2010,35(1):42-45.
[26] HAUPT M.A constitutive law for rock salt based on creep and relaxation tests[J].Rock Mechanics and Rock Engineering,1991,24(4):179-206.
[27] 张占东.盐间页岩油储层人工裂缝有效性评价研究[D].北京:中国石油大学(北京),2018.
ZHANG Zhandong.Research on the evaluation of the effectiveness of artificial fractures in inter-salt shale oil reservoirs[D].Beijing:China University of Petroleum(Beijing),2018.
[28] ALKATTAN M,OELKERS E H,DANDURAND J L,et al.Experimental studies of halite dissolution kinetics Ⅰ:the effect of saturation state and the presence of trace metals[J].Chemical Geology,1997,137(3/4):201-219.
[29] 唐康.水平井水溶造腔腔体扩展及稳定性研究[D].重庆:重庆大学,2017.
TANG Kang.Research on cavity expansion and stability for cavity building with water solution of horizontal wells[D].Chongqing:Chongqing University,2017.
[30] 王春荣.岩盐溶解速率影响因素实验研究[D].重庆:重庆大学,2009.
WANG Chunrong.Experimental study on the influencing factors of rock salt dissolution rate[D].Chongqing:Chongqing University,2009.
[31] ALKATTAN M,OELKERS E H,DANDURAND J L,et al.Experimental studies of halite dissolution kinetics II:the effect of the presence of aqueous trace anions and K3Fe(CN)6[J].Chemical geology,1997,143(1-2):17-26.
[32] 苗文培,姜汉桥,葛洪魁,等.页岩气储层蠕变特性及其对页岩气开发的影响[J].油气地质与采收率,2014,21(4):97-100.
MIAO Wenpei,JIANG Hanqiao,GE Hongkui,et al.Gas shale creep and its influence on the shale gas development[J].Petroleum Geology and Recovery Efficiency,2014,21(4):97-100.
[33] 于佳尧.页岩油储层人工裂缝导流能力影响因素研究[D].北京:中国石油大学(北京),2020.
YU Jiayao.Research on factors influencing the flow conductivity of artificial fractures in shale oil reservoirs[D].Beijing:China University of Petroleum (Beijing),2020.
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