W页岩气藏气井控压生产制度数值模拟研究

doi:10.13809/j.cnki.cn32-1825/te.2023.01.010

摘要/Abstract

摘要：

页岩气藏大规模体积压裂形成复杂裂缝网络，开发过程中应力敏感效应导致页岩气井产量迅速降低。因此，需要开展应力敏感对页岩气井产量的影响规律及控压生产制度研究，进而确定合理生产压差，并优化生产制度。首先，基于嵌入式离散裂缝模型，对压裂后页岩气藏天然裂缝和压裂裂缝进行精确表征，建立页岩气井复杂缝网数值模拟模型。然后，分别研究了裂缝及基质不同应力敏感条件下的页岩气井产气量变化规律。最后，开展控压生产制度优化数值模拟研究，设定40组不同的生产压差方案，厘清生产压差与页岩气井产气量的规律，建立W页岩气藏A区块累产气量与生产压差的关系图，确定该区块最佳控压生产压差为14 MPa。研究结果表明，控压生产对优化页岩气井产量十分重要，可以降低应力敏感对产量的影响，控压生产制度优化方法及结果能够为页岩气井生产提供指导。

关键词: 页岩气, 嵌入式离散裂缝, 应力敏感, 控压生产, 数值模拟

Abstract:

The complex fracture networks are often formed after large-scale hydraulic fracturing in shale gas reservoirs, and the shale gas production rates decrease quickly due to the stress sensitivity. Therefore, it is necessary to study the influence of the stress sensitivity and production schedule under the controlled pressure for shale gas wells to determine the reasonable pressure drop and optimize the production schedule. Firstly, the natural and hydraulic fractures in shale gas reservoir are accurately characterized based on the embedded discrete fracture model（EDFM）, and the numerical simulation models of the shale gas wells based on the complex fracture networks are established. Then, the gas production performance of shale gas wells under different stress sensitivity conditions of fractures and matrix are analyzed. Finally, the numerical simulation on the production schedule optimization under the controlled pressure is performed. Forty groups of different production pressure schemes are designed to clarify the relationship between production pressure and performance of shale gas wells. The relationship curves of the accumulative gas and production pressure are established for Block A of W shale gas reservoir, and the optimal production pressure drop under controlled pressure is determined to be 14 MPa. The results show that the production under the controlled pressure is important for enhancing the production of shale gas wells and can reduce the influence of stress sensitivity on gas production. The optimization method and results of the production schedule under the controlled pressure can provide guidance for the production optimization of the shale gas wells.

Key words: shale gas, embedded discrete fracture, stress sensitivity, production schedule optimization, numerical simulation

中图分类号:

TE122

何封,冯强,崔宇诗. W页岩气藏气井控压生产制度数值模拟研究[J]. 油气藏评价与开发, 2023, 13(1): 91-99.

HE Feng,FENG Qiang,CUI Yushi. Production schedule optimization of gas wells in W shale gas reservoir under controlled pressure difference based on numerical simulation[J]. Reservoir Evaluation and Development, 2023, 13(1): 91-99.

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参考文献 24

[1]	HAN K X, SONG X D, YANG H J. The pricing of shale gas: A review[J]. Journal of Natural Gas Science and Engineering, 2021, 89: 103897.
[2]	ZHANG J C, SI L L, CHEN J G, et al. Stimulation techniques of coalbed methane reservoirs[J]. Geofluids, 2020, 2020: 1-23.
[3]	YAO S S, WANG Q, BAI Y F, et al. A practical gas permeability equation for tight and ultra-tight rocks[J]. Journal of Natural Gas Science and Engineering, 2021, 95: 104215.
[4]	天工. 我国页岩气储量突破1万亿立方米[J]. 天然气工业, 2018, 38(7): 119.
	TIAN Gong. China's shale gas reserves have exceeded 1 trillion cubic meters[J]. Natural Gas Industry, 2018, 38(7): 119.
[5]	何佑伟, 贺质越, 汤勇, 等. 基于机器学习的页岩气井产量评价与预测[J]. 石油钻采工艺, 2021, 43(4): 518-524.
	HE Youwei, HE Zhiyue, TANG Yong, et al. Shale gas well production evaluation and prediction based on machine learning[J]. Oil Drilling and Production Technology, 2021, 43(4): 518-524.
[6]	刘玉章, 杨立峰, 王欣, 等. 页岩气水力压裂裂缝缝网完善程度概论[J]. 天然气工业, 2017, 37(7): 34-39.
	LIU Yuzhang, YANG Lifeng, WANG Xin, et al. Introduction to the completion degree of hydraulic fracture networks in shale gas reservoirs[J]. Natural Gas Industry, 2017, 37(7): 34-39.
[7]	冯雪磊, 马凤山, 赵海军, 等. 断层影响下的页岩气储层水力压裂模拟研究[J]. 工程地质学报, 2021, 29(3): 751-763.
	FENG Xuelei, MA Fengshan, ZHAO Haijun, et al. Numerical simulation of hydraulic fracturing in shale gas reservoirs under fault influence[J]. Journal of Engineering Geology, 2021, 29(3): 751-763.
[8]	辛翠平, 白慧芳, 张磊, 等. 不同裂缝形态页岩气多级压裂水平井产能预测模型应用研究[J]. 非常规油气, 2020, 7(3): 65-71.
	XIN Cuiping, BAI Huifang, ZHANG Lei, et al. Application study of multistage fracturing horizontal well production forecasting models for shale gas with different fracture forms[J]. Unconventional Oil and Gas, 2020, 7(3): 65-71.
[9]	郭为, 熊伟, 高树生. 页岩气藏应力敏感效应实验研究[J]. 特种油气藏, 2012, 19(1): 95-97.
	GUO Wei, XIONG Wei, GAO Shusheng. Experimental study on stress sensitivity of shale gas reservoirs[J]. Special Oil & Gas Reservoirs, 2012, 19(1): 95-97.
[10]	田冷, 肖聪, 顾岱鸿. 考虑应力敏感与非达西效应的页岩气产能模型[J]. 天然气工业, 2014, 34(12): 70-75.
	TIAN Leng, XIAO Cong, GU Daihong. A shale gas reservoir productivity model considering stress sensitivity and non-Darcy flow[J]. Natural Gas Industry, 2014, 34(12): 70-75.
[11]	熊也, 张烈辉, 赵玉龙, 等. 应力敏感页岩气藏水力压裂直井试井分析[J]. 科学技术与工程, 2014, 14(16): 221-225.
	XIONG Ye, ZHANG Liehui, ZHAO Yulong, et al. Pressure transient analysis of hydraulic fractured vertical well in stress-sensitive shale gas reservoirs[J]. Science Technology and Engineering, 2014, 14(16): 221-225.
[12]	FIALLOS Mauricio, MORALES Adrián, YU Wei, 等. 基于嵌入式离散裂缝建模的Eagle Ford页岩油复杂水力裂缝综合表征[J]. 石油勘探与开发, 2021, 48(3): 613-619.
	FIALLOS Mauricio, MORALES Adrián, YU Wei, et al. Characterization of complex hydraulic fractures in Eagle Ford shale oil development through embedded discrete fracture modeling[J]. Petroleum Exploration and Development, 2021, 48(3): 613-619.
[13]	刘勇, 彭小龙, 杜志敏. 裂缝性油藏非结构四边形网格数值模拟研究[J]. 西南石油大学学报(自然科学版), 2018, 40(4): 105-115.
	LIU Yong, PENG Xiaolong, DU Zhimin. Study of quadrilateral unstructured grids in a numerical simulation of fractured reservoirs[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2018, 40(4): 105-115.
[14]	位云生, 王军磊, 于伟, 等. 基于三维分形裂缝模型的页岩气井智能化产能评价方法[J]. 石油勘探与开发, 2021, 48(4): 787-796. doi: 10.1016/S1876-3804(21)60066-6
	WEI Yunsheng, WANG Junlei, YU Wei, et al. A smart productivity evaluation method for shale gas wells based on 3D fractal fracture network model[J]. Petroleum Exploration and Development, 2021, 48(4): 787-796. doi: 10.1016/S1876-3804(21)60066-6
[15]	齐亚东, 贾爱林, 位云生, 等. 页岩气控压生产的理论认识与现场实践[C]// 第31届全国天然气学术年会(2019)论文集(03非常规气藏).北京:中国石油学会天然气专业委员会, 2019: 9.
	QI Yadong, JIA Ailin, WEI Yunsheng, et al. Theoretical understanding and field practice of shale gas controlled pressure production[C]. Proceedings of the 31st National Natural Gas Academic Annual Conference (2019) (03 Unconventional Gas Reservoir) Beijing: Natural Gas Professional Committee of China Petroleum Society, 2019: 9.
[16]	贾爱林, 位云生, 刘成, 等. 页岩气压裂水平井控压生产动态预测模型及其应用[J]. 天然气工业, 2019, 39(6): 71-80.
	JIA Ailin, WEI Yunsheng, LIU Cheng. A dynamic prediction model of pressure control production performance of shale gas fractured horizontal wells and its application[J]. Natural Gas Industry, 2019, 39(6): 71-80.
[17]	李蕾, 郝永卯, 王程伟, 等. 页岩油藏单相流体低速渗流特征[J]. 特种油气藏, 2021, 28(6): 70-75.
	LI Lei, HAO Yongmao, WANG Chengwei, et al. Low-velocity seepage characteristics of single-phase fluid in shale reservoir[J]. Special Oil & Gas Reservoirs, 2021, 28(6): 70-75.
[18]	范明涛, 李社坤, 李军, 等. 深层页岩气水泥环界面密封失效机理研究[J]. 石油机械, 2021, 49(1): 53-57.
	FAN Mingtao, LI Shekun, LI Jun, et al. Study on the sealing failure mechanism of cement sheath interface in deep shale gas wells[J]. China Petroleum Machinery, 2021, 49(1): 53-57.
[19]	XU F, YU W, LI X L, et al, 2018. A fast EDFM method for production simulation of complex fractures in naturally fractured reservoirs[C]// Paper SPE-191800-18ERM-MS Presented at the the SPE/AAPG Eastern Regional Meeting, Pittsburgh, Pennsylvania, USA, October 2018.
[20]	XU Y, YU W. SEPEHRNOORI K. Discrete-fracture modeling of complex hydraulic-fracture geometries in reservoir simulators[J]. SPE Reservoir Evaluation and Engineering, 2017, 20(2): 403-422. doi: 10.2118/183647-PA
[21]	朱维兵, 庞青松, 张朝界. 页岩气旋转式井壁取心器转向机构设计与优化[J]. 石油机械, 2021, 49(4): 51-57.
	ZHU Weibing, PANG Qingsong, ZHANG Chaojie. Design and optimization of steering device for shale gas rotary sidewall coring[J]. China Petroleum Machinery, 2021, 49(4):51-57.
[22]	何畅, 万玉金, 耿晓燕, 等. 页岩气水平井高产主控因素定量评价及应用[J]. 特种油气藏, 2021, 28(5): 113-119.
	HE Chang, WAN Yujin, GENG Xiaoyan, et al. Quantitative evaluation and application of main control factors for high production of horizontal shale gas wells[J]. Special Oil & Gas Reservoirs, 2021, 28(5): 113-119.
[23]	杨波, 罗迪, 张鑫, 等. 异常高压页岩气藏应力敏感及其合理配产研究[J]. 西南石油大学学报, 2016, 38(2): 115-121.
	YANG Bo, LUO Di, ZHANG Xin, et al. A study of stress sensitivity of abnormal high pressure shale gas reservoir and reasonable productivity allocation[J]. Journal of Southwest Petroleum University(Science and Technology Edition), 2016, 38(2): 115-121.
[24]	王军磊, 贾爱林, 位云生, 等. 页岩气井控压生产分析模型建立及应用[C]// 2018年全国天然气学术年会论文集(03非常规气藏). 北京: 中国石油学会天然气专业委员会, 2018.
	WANG Junlei, JIA Ailin, WEI Yunsheng, et al. Analysis of drawdown-management strategy of shale well with stress-sensitive conductivity fractures using semianalytical flowing model[C]. 2018 China Natural Gas Academic Conference Proceedings (03 Unconventional Gas Reservoirs). Beijing: Institute of Petroleum and Gas Professional Committee of China, 2018.