柿庄南区块煤层气高产井排采制度分析

发布时间：2018-01-15 06:16

本文关键词：柿庄南区块煤层气高产井排采制度分析　出处：《煤炭科学技术》2016年08期 　论文类型：期刊论文

【摘要】：为了研究排采制度对柿庄南区块煤层气井产气量的影响,通过对柿庄南区块4口高产井排采曲线进行对比分析,探索总结了高产井排采曲线的共同特征,优选出了适合柿庄南区块的排采制度。结果表明:高产井的排采曲线呈现阶梯状变化规律特征。产气后井底流压的变化分为4个阶段,即:缓慢下降阶段、逐级降压阶段、迅速下降阶段和稳定阶段;缓慢降压阶段为排采初期排水降压阶段到不稳定产气阶段的过渡阶段;逐级降压阶段储层压力逐渐下降,压降漏斗稳定向远端延伸;在迅速下降阶段,出现了井间干扰使得压降漏斗相互叠加并向深处扩展,产气量陡增;稳定阶段,是井底流压下降到一个较低水平并保持长期稳定,气体稳定解吸,产气量稳定在一个较高水平。迅速下降阶段之前稳定套压,之后缓慢释放套压,有利于储层防护。井底流压见气前平缓下降,见气后阶梯状变化的排采制度有利于柿庄南区块排采井的高产。
[Abstract]:In order to study the effect of drainage system of coal seam Shizhuang south block gas production, through comparative analysis of the Shizhuang South Block 4 high yield wells production curve, explore and summarize the common features of high yield wells production curve, optimized Shizhuang south block drainage system. The results show that the high yield wells the drainage curve changes. Stepwise variation of gas production after BHFP is divided into 4 stages, namely: slow down stage, stepped down stage, rapid decline stage and stable stage; slow step-down stage for drainage drainage early stage to the transition stage of unstable gas production stage; step by step buck reservoir pressure gradually decreased, stable pressure drop funnel extends distally; in the rapidly declining stage, the interference between wells the pressure drop funnel superposition to depths of expansion, gas production increased sharply; stable stage, is down to the bottom hole flowing pressure A low level and maintain long-term stable, stable gas desorption, gas production stabilized at a high level. Rapid decline stage before the stable set pressure, after the slow release of set pressure, which is beneficial to reservoir protection. BHFP see gas before the gas fell flat, see step like change of the drainage system is conducive to Shizhuang south block drainage wells in high yield.

【作者单位】：中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室;中国地质大学(北京)页岩气资源勘查与战略评价国土资源部重点实验室;中联煤层气有限责任公司;
【基金】：国家科技重大专项资助项目(2011ZX05060,2011ZX05034-003)
【分类号】：TE37
【正文快照】： Analysis on drainage system of coalbed methane highproduction well in south block of ShizhuangYang Guoqiao1,2,Tang Shuheng1,2,Li Zhongcheng3,Zhang Songhang1,2,Shi Wei1,20引言沁水盆地南部柿庄南区块煤层气已经进入大规模开发阶段,部分煤层气井已经进入稳定产气

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