水力压裂裂缝内支撑剂颗粒空隙率分布的形成机制

关舒文; 胡胜勇; 张惜图; 冯国瑞; 李国富; 陈云波

水力压裂裂缝内支撑剂颗粒空隙率分布的形成机制

计量
- 文章访问数: 44
- HTML全文浏览量: 1
- PDF下载量: 1
出版历程
- 发布日期: 2021-03-19

Formation mechanism of proppant particle voidage distribution in hydraulic fracturing fractures

摘要

摘要: 为了解水力压裂裂缝内支撑剂颗粒空隙率的演变,采用数值模拟方法模拟了裂缝内支撑剂颗粒在不同应力下的压缩过程,通过研究裂缝内支撑剂的接触力及配位数分布揭示了其空隙率分布的形成机制。结果表明:裂缝内支撑剂颗粒空隙率自下而上呈缓减小-急减小-缓减小-急增大-缓增大的分布趋势;将其分为底层、中层和顶层3个层位,相同应力状态下,底层支撑剂间接触力最弱为应力衰减区,平均配位数最小,空隙率最大;中层支撑剂间接触力最强为应力承受区,颗粒向下传递力的能力最弱,平均配位数最大,空隙率最小;顶层颗粒向下传递能力最强为应力传递区,支撑剂间接触力较弱,平均配位数和空隙率介于应力承受区和应力衰减区之间。
- 煤层气 /
- 水力压裂 /
- 支撑裂缝 /
- 支撑剂 /
- 空隙率
Abstract: In order to understand the proppant particle voidage evolution of the hydraulic propped fractures, the numerical simulation method was used to simulate the compression process of the proppant particle in fracture under different closed stresses. The formation mechanism of void distribution of the proppant particle in fracture was revealed by investigating the distributions of contact force and coordination number of the proppant particles in fracture. The results showed that the proppant particle voidage distribution from the bottom to top was as follows: decreasing slowly, decreasing sharply, decreasing slowly, increasing sharply, increasing slowly. The propped fractures were divided into three different layers: bottom, middle and top layers under the same stress state, the bottom proppants with the weakest contact force was the stress attenuation zone. In this zone, the average coordination number was the smallest and the void ratio was the largest. The middle proppant with the strongest contact force was the stress bearing zone. In the area, particles had the weakest ability to transmit force downwards, the average coordination number was the largest and the void ratio was the smallest. The top particles with the strongest ability to transmit force downwards were called the stress transfer zone. In this area, the contact force between the proppants was weak, and the average coordination number and void ratio were between those of the stress bearing zone and stress attenuation zone, respectively.
- coalbed methane /
- hydraulic fracturing /
- propped fracture /
- proppant /
- void ratio

HTML全文

参考文献(16)

[1]	赵贤正,朱庆忠,孙粉锦,等.沁水盆地高阶煤层气勘探开发实践与思考[J].煤炭学报,2015,40(9):2131. ZHAO Xianzheng, ZHU Qingzhong, SUN Fenjin, et al. Practice and thought of coalbed methane exploration and development in Qinshui Basin[J]. Journal of China Coal Society, 2015, 40(9): 2131.
[2]	ZHANG J C. Numerical simulation of hydraulic fracturing coalbed methane reservoir[J]. Fuel, 2014, 136: 57.
[3]	WANG J H, ELSWORTH D. Role of proppant distribution on the evolution of hydraulic fracture conductivity[J]. Journal of Petroleum Science and Engineering, 2018, 166: 249-262.
[4]	杨尚谕,杨秀娟,闫相祯,等.煤层气水力压裂缝内变密度支撑剂运移规律[J].煤炭学报,2014,39(12):2459-2465. YANG Shangyu, YANG Xiujuan, YAN Xiangzhen, et al. Variable density proppant placement in CBM wells fractures[J]. Journal of China Coal Society, 2014, 39(12): 2459-2465.
[5]	温庆志,翟恒立,罗明良,等.页岩气藏压裂支撑剂沉降及运移规律实验研究[J].油气地质与采收率,2012,19(6):104-107. WEN Qingzhi, ZHAI Hengli, LUO Mingliang, et al. Study on proppant settlement and transport rule in shale gas fracturing[J]. Petroleum Geology and Recovery Efficiency, 2012, 19(6): 104-107.
[6]	潘林华,张烨,程礼军,等.页岩储层体积压裂复杂裂缝支撑剂的运移与展布规律[J].天然气工业,2018, 38(5): 61-70. PAN Linhua, ZHANG Ye, CHENG Lijun, et al. Migration and distribution of complex fracture proppant in shale reservoir volume fracturing[J]. Natural Gas Industry, 2018,38(5): 61-70.
[7]	刘春亭,李明忠,郝丽华,等.水力裂缝内支撑剂输送沉降行为数值仿真[J].大庆石油地质与开发,2018, 37(5):89-96. LIU Chunting, LI Mingzhong, HAO Lihua, et al. Numerical simulation of the proppant transportationand setting in the hydraulic fracture[J]. Petroleum Geology & Oilfield Development in Daqing, 2018, 37(5): 89-96.
[8]	ZENG J S, LI H, ZHANG D X. Numerical simulation of proppant transport in propagating fractures with the multi-phase particle-in-cell method[J]. Fuel, 2019, 245: 316-335.
[9]	TAN Y L, PAN Z J, LIU J S, et al. Laboratory study of proppant on shale fracture permeability and compressibility[J]. Fuel, 2018, 222: 83-97.
[10]	ZHENG W B, SILVA S C, TANNANT D D. Crushing characteristics of four different proppants and implications for fracture conductivity[J]. Journal of Natural Gas Science and Engineering, 2018, 53: 125-138.
[11]	SHAMSI M M M, NIA S F, JESSEN K. Dynamic conductivity of proppant-filled fractures[J]. Journal of Petroleum Science and Engineering, 2017, 151: 183.
[12]	SANTOS L, TALEGHANI A D, LI G Q. Expandable proppants to moderate production drop in hydraulically fractured wells[J]. Journal of Natural Gas Science and Engineering, 2018, 55: 182-190.
[13]	邓守春,左鸿,李海波,等.地应力作用下水力裂缝中支撑剂导流能力的数值模拟研究[J].煤炭学报,2017,42(S2):434-440. DENG Shouchun, ZUO Hong, LI Haibo, et al. Numerical investigation of flow conductivity of propping agent in hydraulic fracture under in-situ stresses[J]. Journal of China Coal Society, 2017, 42(S2): 434-440.
[14]	BOLINTINEANU D S, RAO R R, LECHMAN J B, et al. Simulations of the effects of proppant placement on the conductivity and mechanical stability of hydraulic fractures[J]. International Journal of Rock Mechanics and Mining Sciences, 2017, 100: 188-198.
[15]	Fu L P, ZHANG G C, GE J J, et al. Surface modified proppants used for proppant flowback control in hydraulic fracturing[J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2016, 507: 18-25.
[16]	卢义玉,韩帅彬,汤积仁,等.循环荷载下支撑剂的变形及渗透特性试验研究[J].岩土力学,2017,38(S1):173-180. LU Yiyu, HAN Shuaibin, TANG Jiren, et al. Experimental study of deformation and seepage characteristics of proppant under cyclic loading[J]. Rock and Soil Mechanics, 2017, 38 (S1): 173-180..