浅层致密油藏空间编织井网开发数值模拟研究

doi:10.13809/j.cnki.cn32-1825/te.2021.06.015

摘要/Abstract

摘要：

浅层致密油藏中水力压裂容易产生水平缝。对于水平井而言,多级压裂容易只生成一条大的水平缝,增产效果不佳。而“弓形水平井+多级水平缝”的单井方式,也不能有效动用此类油藏。为了进一步提高浅层致密油藏的动用程度,基于浅层油层钻井的可行性,提出了浅层致密油藏空间编织井网的开发方式,并采用数值模拟方法,验证了空间编织井网的有效性。数值模拟结果表明：在相同的井数和钻井进尺条件下,空间编织井网的油产量、累产油量、油藏采出程度高于正对井排和交错井排;不过随着水平压裂缝规模扩大,与交错井排的差距减小。同时,根据模拟得出采用七点井网注水补充了地层能量,也改变了渗流状态,使得区域边缘和井间剩余油得以有效驱替,采收率明显提高。研究结果为浅层致密油藏的高效开发提供借鉴。

关键词: 浅层油藏, 致密油藏, 水平缝, 弓形井, 空间编织井网

Abstract:

In shallow tight reservoirs, the hydraulic fracturing tends to produce horizontal fractures. For the horizontal wells, multi-stage fracturing is easy to generate only one large horizontal fracture, which leads to poor stimulation effect. However, the single well mode of “bow-shape horizontal well + multi-stage horizontal fractures” can not effectively explore this kind of reservoir. In order to further improve the production degree of shallow tight reservoir, the development mode of spatial-braided well pattern in shallow tight reservoir is proposed based on the feasibility of shallow reservoir drilling, and the numerical simulation is used to verify the effectiveness of spatial-braided well pattern. The numerical simulation results show that under the same number of wells and drilling footage, the oil production, cumulative oil production and reservoir recovery degree of spatial-braided well pattern are higher than those of the opposite well pattern and staggered well pattern. However, with the expansion of the fracture scale in horizontal fracturing, the gap with staggered well pattern decreases. At the same time, according to the simulation, the reverse 7-point pattern water injection not only replenishes the formation energy, but also changes the seepage state, so that the remaining oil in the regional edge and between wells can be effectively displaced, and the recovery rate is significantly improved. The researches provide efficient development method for the efficient development of shallow tight reservoir.

Key words: shallow reservoir, tight reservoir, horizontal well, bow-shape well, spatial-braided well pattern

中图分类号:

TE349

冯宁,彭小龙,薛晓军等. 浅层致密油藏空间编织井网开发数值模拟研究[J]. 油气藏评价与开发, 2021, 11(6): 897-904.

Ning FENG,Xiaolong PENG,Xiaojun XUE, et al. Numerical simulation of spatial-braided bow-shape well pattern development in shallow tight reservoir[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(6): 897-904.

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参考文献 29

[1]	计秉玉, 王友启, 张莉. 基于地质储量结构变化的采收率演变趋势[J]. 石油与天然气地质, 2020, 41(6):1257-1262.
	JI Bingyu, WANG Youqi, ZHANG Li. Research on overall recovery rate variations of dynamically changing OOIP[J]. Oil & Gas Geology, 2020, 41(6):1257-1262.
[2]	王香增, 党海龙, 高涛. 延长油田特低渗油藏适度温和注水方法与应用[J]. 石油勘探与开发, 2018, 45(6):1026-1034.
	WANG Xiangzeng, DANG Hailong, GAO Tao. Method of moderate water injection and its application in ultra-low permeability oil reservoirs of Yanchang Oilfield, NW China[J]. Petroleum Exploration and Development, 2018, 45(6):1026-1034.
[3]	赵继勇, 安小平, 王晶, 等. 超低渗油藏井网适应性定量评价方法——以鄂尔多斯盆地三叠系长6、长8油藏为例[J]. 石油勘探与开发, 2018, 45(3):482-488.
	ZHAO Jiyong, AN Xiaoping, WANG Jing, et al. A quantitative evaluation for well pattern adaptability in ultra-low permeability oil reservoirs: A case study of Triassic Chang 6 and Chang 8 reservoirs in Ordos Basin[J]. Petroleum Exploration and Development, 2018, 45(3):482-488.
[4]	罗晓容, 王忠楠, 雷裕红, 等. 特超低渗砂岩油藏储层非均质性特征与成藏模式——以鄂尔多斯盆地西部延长组下组合为例[J]. 石油学报, 2016, 37(S1):87-98.
	LUO Xiaorong, WANG Zhongnan, LEI Yuhong, et al. Heterogeneity characteristics and accumulation model of ultra-low permeability sandstone reservoirs: case study of the lower part of Yanchang Formation in the western Ordos Basin,China[J]. Acta Petrolei Sinica, 2016, 37(S1):87-98.
[5]	党海龙, 姜汉桥, 王小锋, 等. 延长组长6低渗油藏高温高压条件下裂缝对渗吸效率的影响[J]. 石油与天然气化工, 2020, 49(2):87-92.
	DANG Hailong, JIANG Hanqiao, WANG Xiaofeng, et al. Influence of crack on imbibition efficiency of low permeability reservoir in Yanchang Chang 6 formation under high temperature and high pressure condition[J]. Chemical Engineering of Oil & Gas, 2020, 49(2):87-92.
[6]	赵继勇, 樊建明, 何永宏, 等. 超低渗—致密油藏水平井开发注采参数优化实践——以鄂尔多斯盆地长庆油田为例[J]. 石油勘探与开发, 2015, 42(1):68-75.
	ZHAO Jiyong, FAN Jianming, HE Yonghong, et al. Optimization of horizontal well injection-production parameters for ultra-low permeable-tight oil production: A case from Changqing Oilfield, Ordos Basin[J]. Petroleum Exploration and Development, 2015, 42(1):68-75.
[7]	时丕同, 郝世彦, 赵习森, 等. 延长油田水平井开发技术及应用[C]// 西安石油大学,陕西省石油学会.IFEDC油气田勘探与开发国际会议论文集.西安:中国学术期刊(光盘版)电子杂志有限公司, 2018.
	SHI Pitong, HAO Shiyan, ZHAO Xisen, et al. Development technology and application of horizontal well in Yanchang Oilfield[C]// Xi’an Petroleum University, Shanxi Petroleum Society. Proceedings of International Conference on Oil and Gas Field Exploration and Development(IFEDC). Xi’an: China Academic Journals(CD-ROM) Electronic Magazine Co. Ltd, 2018.
[8]	贾自力, 石彬, 周红燕, 等. 超低渗透水平裂缝油藏水平井井眼轨迹优化技术[J]. 特种油气藏, 2017, 24(3):150-154.
	JIA Zili, SHI Bin, ZHOU Hongyan, et al. Well path optimization technique for horizontal wells in reservoirs with ultra-low permeability and horizontal fractures[J]. Special Oil & Gas Reservoirs, 2017, 24(3):150-154.
[9]	朱维耀, 刘青, 岳明, 等. 考虑支撑剂裂缝导流能力计算及缝内支撑剂运移模拟[J]. 石油与天然气化工, 2019, 48(2):75-78.
	ZHU Weiyao, LIU Qing, YUE Ming, et al. Calculation of fracture conductivity considering proppant influence and simulation of proppant transport in fracture[J]. Chemical Engineering of Oil & Gas, 2019, 48(2):75-78.
[10]	熊颖, 刘友权, 梅志宏, 等. 四川页岩气开发用耐高矿化度滑溜水技术研究[J]. 石油与天然气化工, 2019, 48(3):62-65.
	XIONG Ying, LIU Youquan, MEI Zhihong, et al. Slick water technology of high salinity resistance for shale gas development in Sichuan[J]. Chemical Engineering of Oil & Gas, 2019, 48(3):62-65.
[11]	姚同玉, 王明, 朱维耀, 等. 低渗油层压裂水平井两相流研究[J]. 力学与实践, 2011, 33(1):66-69.
	YAO Tongyu, WANG Ming, ZHU Weiyao, et al. Analysis of two-phase percolation of fractured horizontal wells in low permeability Oil Reservoirs[J]. Mechanics and Practice, 2011, 33(1):66-69.
[12]	ZHANG L F, ZHOU F J, ZHANG S C, et al. Evaluation of permeability damage caused by drilling and fracturing fluids in tight low permeability sandstone reservoirs[J]. Journal of Petroleum Science and Engineering, 2019, 175. doi: 10.1016/j.petrol.2019.01.031 doi: 10.1016/j.petrol.2019.01.031
[13]	LUO X R, QI Y, LI J S, et al. Convection heat transfer and friction characteristics of liquid CO₂-N₂ foam fracturing fluid using C₄F₉OCH₃ as frother[J]. Journal of Petroleum Science and Engineering, 2019, 183. doi: 10.1016/j.petrol.2019.106461 doi: 10.1016/j.petrol.2019.106461
[14]	陈阳, 韩大伟, 卢祥国, 等. 缝网压裂裂缝形态对低渗油藏渗吸采油效果影响实验[J]. 大庆石油地质与开发, 2017, 36(4):123-127.
	CHEN Yang, HAN Dawei, LU Xiangguo, et al. Influence experiment of the fracture morphology of the network fracturing on the effects of the imbibition recovery for low permeability Oil Reservoir[J]. Petroleum Geology & Oilfied Development in Daqing, 2017, 36(4):123-127.
[15]	崔传智, 李荣涛, 李志涛, 等. 特低渗油藏分段压裂水平井经济技术界限研究[J]. 科学技术与工程, 2017, 17(5):41-46.
	CUI Chuanzhi, LI Rongtao, LI Zhitao, et al. The study on economic and technical boundary values of multi-stage fractured horizontal well in ultra-low permeability reservoirs[J]. Science Technology and Engineering, 2017, 17(5):41-46.
[16]	ZHANG C L, WANG P, SONG G L, et al. Research on property of multicomponent thickening water fracturing fluid and application in low permeability oil reservoirs[J]. Journal of Chemistry, 2018, 2018(5):1-10. doi: 10.1155/2018/1231490 doi: 10.1155/2018/1231490
[17]	AI K, DUAN L C, GAO H, et al. Hydraulic fracturing treatment optimization for low permeability reservoirs based on unified fracture design[J]. Energies, 2018, 11(7). doi: 10.3390/en11071720 doi: 10.3390/en11071720
[18]	GUO T K, GONG F C, LIN X, et al. Experimental investigation on damage mechanism of guar gum fracturing fluid to low-permeability reservoir based on nuclear magnetic resonance[J]. Journal of Energy Resources Technology, 2018, 140(7). doi: 10.1115/1.4039324 doi: 10.1115/1.4039324
[19]	王言, 郑强, 马崇尧, 等. tNavigator油藏数模软件在低渗油藏压裂优化中的应用[J]. 新疆石油天然气, 2016, 12(3):29-31.
	WANG Yan, ZHENG Qiang, MA Chongyao, et al. Tnavigator reservoir numerical simulation Software application in the low permeability Reservoir Fracturing Optimization[J]. Xinjiang Petroleum Gas, 2016, 12(3):29-31.
[20]	王磊. HZ油田特低渗油藏压裂后有效开发研究与应用[J]. 天然气与石油, 2016, 34(4):50-54.
	WANG Lei. Research and application of effective development for extra-low permeability reservoir in HZ Oil Field after fracture[J]. Natural Gas and Oil, 2016, 34(4):50-54.
[21]	刘兴国, 董海海, 张娟. 厚层块状特低渗砾岩油藏水平井压裂参数优化[J]. 当代化工研究, 2016(7):104-105.
	LIU Xingguo, DONG Haihai, ZHANG Juan. Parameter optimization of horizontal well fracturing in the thick layer ultra-low permeability conglomerate reservoir[J]. Mordern Chemical Research, 2016(7):104-105.
[22]	张丁涌, 袁士宝, 田相雷, 等. 低渗油藏径向水力射流压裂裂缝延伸规律[J]. 中国石油大学学报(自然科学版), 2016, 40(2):129-134.
	ZHANG Dingyong, YUAN Shibao, TIAN Xianglei, et al. Research on fracturing extension by radial hydraulic jet in low permeability reservoirs[J]. Journal of China University of Petroleum(Edition of Natural Science), 2016, 40(2):129-134.
[23]	王鹏, 赵益忠, 崔明月, 等. 压裂防砂技术在胜利油田低渗敏感稠油油藏的应用[J]. 断块油气田, 2016, 23(2):269-272.
	WANG Peng, ZHAO Yizhong, CUI Mingyue, et al. Application of fracturing sand control technology in low permeability sensitive heavy oil reservoir of Shengli Oilfield[J]. Fault-Block Oil & Gas Field, 2016, 23(2):269-272.
[24]	韩松. YZM特低渗油藏压裂水平缝注水吞吐机理及应用研究[D]. 北京:中国石油大学, 2019.
	HAN Song. Study on the mechanism and application of water injection in horizontal fractures in YZM ultra-low permeability reservoirs[D]. Beijing: China University of Petroleum, 2019.
[25]	李莉. 低渗油藏压裂水平缝注水开发研究[D]. 成都:西南石油大学, 2018.
	LI Li. The water flooding of production well with horizontal hydraulic fractures in low permeability reservoirs[D]. Chengdu: Southwest Petroleum University, 2018.
[26]	高涛. 特低渗砂岩油藏水平缝应力敏感实验研究及产能计算[D]. 成都:西南石油大学, 2015.
	GAO Tao. Experimental study and productivity calculation of horizontal fracture stress sensitivity in ultra-low permeability sandstone reservoir[D]. Chengdu: Southwest Petroleum University, 2015.
[27]	聂翠平, 李相方, 高超利, 等. 水力喷射压裂技术在浅层水平缝压裂中的应用研究[J]. 西安石油大学学报(自然科学版), 2012, 27(3):41-45.
	NIE Cuiping, LI Xiangfang, GAO Chaoli, et al. Application study of hydraulic jet fracturing to the fracturing of horizontal fracture in shallow reservoir[J]. Journal of Xi’an Shiyou University(Natural Science Edition), 2012, 27(3):41-45.
[28]	杜贵超, 胡双全, 石立华, 等. 七里村油田长6油层组储层特征及孔隙演化[J]. 岩性油气藏, 2015, 27(1):51-57.
	DU Guichao, HU Shuangquan, SHI Lihua, et al. Reservoir characteristics and pore evolution of Chang 6 oil reservoir set in Qilicun Oilfield[J]. Lithologic Reservoirs, 2015, 27(1):51-57.
[29]	严侠, 黄朝琴, 姚军, 等. 基于模拟有限差分的嵌入式离散裂缝数学模型[J]. 中国科学(技术科学), 2014, 44(12):1333-1342.
	YAN Xia, HUANG ZhaoQin, YAO Jun, et al. An embedded discrete crack mathematical model based on simulated finite difference method[J]. Scientia Slnica Technologica, 2014, 44(12):1333-1342.

物性参数	参数值	物性参数	参数值
储层顶深（m）	500	孔隙度（%）	9
储层厚度（m）	12	渗透率（10^-3μm²）	0.9
地层压力（MPa）	4.95	地层水黏度（mPa·s）	1
地层原油密度（g/cm³）	0.83	地层水压缩系数（MPa^-1）	0.000 05
地层原油黏度（mPa·s）	4.29	地层水压缩系数（MPa^-1）	0.000 05
地层原油体积系数	1.036	原油压缩系数（MPa^-1）	0.000 2