长宁区块页岩气井排液技术现状及攻关方向探讨

发布时间：2018-01-15 09:47

本文关键词：长宁区块页岩气井排液技术现状及攻关方向探讨　出处：《钻采工艺》2017年04期 　论文类型：期刊论文

【摘要】：页岩气储层具有脆性高、孔隙度和渗透率极低、天然微裂缝发育等特点,须通过大规模水力压裂作业形成复杂裂缝网络来获得工业气流。排液作为压裂和后期生产"衔上接下"的关键一环,在页岩气开发中被高度重视。目前长宁大多数页岩气井采用经验方法或者借助邻井的返排数据指导控制排液,缺乏理论依据。文章针对长宁区块页岩气井返排关井时间、返排速率、返排率、返排液矿化度等,提出了从五个方面进行排液技术研究:压裂后关井时间对裂缝扩展、气井产量的影响;返排液矿化度和离子成分变化的特征及离子来源;页岩气井返排效果影响因素及压裂液去向问题;压裂液滞留于地层对页岩气储层伤害及返排率对气井产量的影响;返排控制参数对返排率及支撑剂回流的影响。
[Abstract]:Shale gas reservoirs are characterized by high brittleness, extremely low porosity and permeability, and the development of natural micro-fractures. It is necessary to form a complex fracture network through large-scale hydraulic fracturing operations to obtain industrial airflow. Fluid drain is the key link of fracturing and later production "up and down". At present, most of the shale gas wells in Changning use empirical method or the guidance of adjacent wells to guide the control of drainage. There is no theoretical basis. This paper aims at the shut-in time, rate, rate and salinity of back discharge of shale gas wells in Changning area. The following five aspects are put forward to study the drainage technology: the effect of shut-in time after fracturing on fracture propagation and gas well production; The characteristics and sources of the salinity and ion composition of the effluents; The influencing factors of shale gas well backflow and the problem of fracturing fluid direction; The effect of fracturing fluid retention on shale gas reservoir damage and recovery rate on gas well production; The effect of control parameters on the rate of reflux and the reflux of proppant.
【作者单位】：中石油西南油气田分公司工程技术研究院;国家能源高含硫气藏开采研发中心·工程院;中石油川庆钻探公司有限公司钻采工程技术研究院;
【分类号】：TE377
【正文快照】： 页岩气储层具有脆性高、孔隙度和渗透率极低、天然微裂缝发育等特点,以常规气藏的开采方式进行开发无法获得工业气流。必须通过大规模水力压裂作业,形成复杂的裂缝网络,增大裂缝面与页岩基质的接触面积,从而实现页岩气的工业开采[1-3]。压后排液作为压裂和后期生产“衔上接下

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