|
|
Abstract In order to clarify the propagation track and the variation rule of deflection distance of fractures during oriented perforation steering fracturing in low permeability unconventional oil and gas reservoirs，a dynamic propagation model for oriented perforation steering fracturing cracks based on microelement method was established by comprehensively considering the influences of horizontal in situ stress difference，perforation parameters，injection parameters and formation mechanical parameters. The model completes the cyclic iteration calculation between the minor step increment and the propagation deflection angle of the crack tip using a calculation program compiled by Visual Basic，and realizes the simulation of the dynamic propagation of steering fractures. The accuracy of the MEM model was verified by comparing the differences among fracture trajectories calculated by MEM model and extended finite element(XFEM) model，micro-seismic monitoring values in the fracturing field and indoor fracturing test results. Taking the tight sandstone reservoir of Shihezi Formation in Linxing block as an example，the influence mechanisms of various factors on the deflection distance of the hydraulic fracture trajectory were studied. The results show that，compared with the XFEM model，the hydraulic fracture trajectory simulated by the proposed model better matches with the micro-seismic monitoring results. The deflection distance decreases negatively logarithmically with increasing horizontal in situ stress difference while increases linearly with increasing the perforated angle，injection rate and viscosity. The perforation length has little effect on the deflection distance. The research work is significant to further understand oriented perforation steering fracturing.
|
|
|
|
|
|
[1] WANGEN M. A 2D volume conservative numerical model of hydraulic fracturing[J]. Computers and Structures，2017，182：448–458.
[2] ZHANG R，KANG T，KANG J，et al. Influence of horizontal control holes on fracture height containment in low permeability layered coal measure gas reservoirs[J]. Journal of Petroleum Science and Engineering，2019，179：104–111.
[3] DENG J，YANG Q，LIU Y，et al. 3D finite element modeling of directional hydraulic fracturing based on deformation reinforcement theory[J]. Computers and Geotechnics，2018，94：118–133.
[4] CHEN Z，ECONOMIDES M J. Effect of near-wellbore fracture geometry on fracture execution and post-treatment well production of deviated and horizontal wells[J]. SPE Production and Facilities，1999，14(3)：177–186.
[5] HOSSAIN M M，RAHMAN M K，RAHMAN S S. A comprehensive monograph for hydraulic fracture initiation from deviated wellbores under arbitrary stress regimes[C]// paper 54360–MS presented at the SPE Asia Pacific Oil and Gas Conference and Exhibition. New York，USA：SPE，1999：20–22.
[6] OLSON J E. Fracturing from highly deviated and horizontal wells： numerical analysis of non-planar fracture propagation[R]. [S. l.]：Society of Petroleum Engineers，2015.
[7] 张广清，陈 勉，赵艳波. 新井定向射孔转向压裂裂缝起裂与延伸机制研究[J]. 石油学报，2008，29(1)：116–119.(ZHANG Guangqing，CHEN Mian，ZHAO Yanbo. Study on initiation and propagation mechanism of fractures in oriented perforation of new wells[J]. Acta Petrolei Sinica，2008，9(1)：116–119.(in Chinese))
[8] ZHANG G Q，CHEN M，WANG X S，et al. Influence of perforation on formation fracturing pressure[J]. Petroleum Science，2004，1(3)：56–61.
[9] ELBEL J L，MACK M G. Re-fracturing：observations and theories[C]// SPE Production Operations Symposium. [S. 1.]：[s. n.]，1993：21–23.
[10] 陈 勉. 页岩气储层水力裂缝转向扩展机制[J]. 中国石油大学学报：自然科学版，2013，37(5)：88–94.(CHEN Mian. Re-orientation and propagation of hydraulic fractures in shale gas reservoir[J]. Journal of China University of Petroleum：Natural Science，2013，37(5)：88–94.(in Chinese))
[11] ZHANG G Q，CHEN M. The relationship between the production rate and initiation location of new fractures in a refractured well[J]. Petroleum Science and Technology，2010，28(7)：655–666.
[12] ZHANG G Q，CHEN M. Dynamic fracture propagation in hydraulic re-fracturing[J]. Journal of Petroleum Science and Engineering，2010，70(3/4)：266–272.
[13] LIU L，LI L，ELSWORTH D，et al. The impact of oriented perforations on fracture propagation and complexity in hydraulic fracturing[J]. Processes，2018，6(11)：213–232.
[14] HU Y，CHEN G，CHENG W，et al. Simulation of hydraulic fracturing in rock mass using a smeared crack model[J]. Computers and Structures，2014，137：72–77.
[15] SESETTY V，GHASSEMI A. A numerical study of sequential and simultaneous hydraulic fracturing in single and multi-lateral horizontal wells[J]. Journal of Petroleum Science and Engineering，2015，132：65–76.
[16] WANG X L，SHI F，LIU C，et al. Extended finite element simulation of fracture network propagation in formation containing frictional and cemented natural fractures[J]. Journal of Natural Gas Science and Engineering，2018，50：309–324.
[17] WANG B，ZHOU F，WANG D，et al. Numerical simulation on near-wellbore temporary plugging and diverting during re-fracturing using XFEM-Based CZM[J]. Journal of Natural Gas Science and Engineering，2018，55：368–381.
[18] SEPENRI J，SOLIMAN M Y，MORSE S M. Application of extended finite element method to simulate hydraulic fracture propagation from oriented perforations[R]. [S. 1.]：hydraulic fracturing technology conference. Society of Petroleum Engineers，2015.
[19] 姜 浒，陈 勉，张广清，等. 定向射孔对水力裂缝起裂与延伸的影响[J]. 岩石力学与工程学报，2009，28(7)：1 321–1 326.(JIANG Hu，CHEN Mian，ZHANG Guangqing，et al. Impact of oriented perforation on hydraulic fracture initiation and propagation[J]. Journal of Rock Mechanics and Engineering，2009，28(7)：1 321–1 326.(in Chinese))
[20] 龚迪光，曲占庆，李建雄，等. 基于ABAQUS平台的水力裂缝扩展有限元模拟研究[J]. 岩土力学，2016，37(5)：1 512–1 520. (GONG Diguang，QU Zhanqing，LI Jianxiong，et al. Extended finite element simulation of hydraulic fracture based on ABAQUS platform[J]. Rock and Soil Mechanics，2016，37(5)：1 512–1 520.(in Chinese))
[21] 盛 茂，李根生. 水力压裂过程的扩展有限元数值模拟方法[J]. 工程力学，2014，31(10)：123–128.(SHENG Mao，LI Gensheng. Extended finite element modeling of hydraulic fracture propagation[J]. Engineering Mechanics，2014，31(10)：123–128.(in Chinese))
[22] 张云银，刘海宁，李红梅，等. 应用微地震监测数据估算储层压裂改造体积[J]. 石油地球物理勘探，2017，52(2)：309–314.(ZHANG Yunyin，LIU Haining，LI Hongmei，et al. Reservoir fracturing volume estimation with micro-seismic monitoring data[J]. Oil Geophysical Prospecting，2017，52(2)：309–314.(in Chinese))
[23] 刘继民，刘建中，刘志鹏，等. 用微地震法监测压裂裂缝转向过程[J]. 石油勘探与开发，2005，32(2)：75–77.(LIU Jimin，LIU Jianzhong，LIU Zhipeng，et al. Micro-seismic monitoring on direction change of hydro fractured cracks[J]. Petroleum Exploration and Development，2005，32(2)：75–77.(in Chinese))
[24] GRIFFIN L G，WRIGHT C A，DAVIS E J，et al. Surface and down hole tilt meter fracture mapping：An effective tool for monitoring drill cuttings disposal[C]// the 2000 SPE Annual Technical Conference. [S. l.]：[s. n.]，2000：1–4.
|
|
|
