高阶煤层气高效开发工程技术优选模式及其应用

发布时间：2018-01-07 08:00

本文关键词：高阶煤层气高效开发工程技术优选模式及其应用　出处：《天然气工业》2017年10期 　论文类型：期刊论文

【摘要】：高阶煤层气井的平均单井产气量低已成为制约我国煤层气产业发展的主要瓶颈之一,直接导致了煤层气开发经济效益低。为此,基于不同煤储层的地质条件,选择适用于煤层气高效开发的工程技术是提高当前高阶煤层气开发效益的关键。在剖析影响高阶煤层气开发效果的地质因素的基础上,建立了高阶煤层气开发的地质模式,并针对不同的地质模式优选出了相应的开发工程技术。结果表明:(1)影响高阶煤层气开发效果的主要地质因素按其影响程度从小到大依次为:煤体结构、煤岩变质程度、地应力、临储比;(2)据此划分了直井压裂、裸眼多分支水平井、U型和顶板仿树形水平井、鱼骨状和单支型水平井等4种工程地质模式。结论认为:直井压裂和裸眼多分支水平井仅适用于煤体结构好、变质程度高的地区;而低成本、后期可维护、占地面积少的单支型水平井和鱼骨状水平井适用范围广,是适宜大力推广的井型。
[Abstract]:The low average gas production of high-order coalbed methane wells has become one of the main bottlenecks restricting the development of coal-bed methane industry in China, which directly leads to the low economic benefits of coal-bed methane development. Therefore, based on the geological conditions of different coal reservoirs. It is the key to improve the benefit of high-order coalbed methane development to select the engineering technology suitable for high-order coalbed methane development. On the basis of analyzing the geological factors that affect the development effect of high-order coalbed methane. The geological model of high-order coalbed methane development is established. According to different geological models, the corresponding development engineering technology is selected. The results show that the main geological factors affecting the development effect of high-order coalbed methane are: coal structure according to its influence degree from small to large. Metamorphic degree of coal and rock, in-situ stress and reservoir ratio; (2) according to this method, the vertical well fracturing, open hole multi-branch horizontal well U type and roof tree-like horizontal well are divided. Four engineering geological models such as fishbone type and single branch horizontal well. It is concluded that the fracturing of straight well and the open hole multi-branch horizontal well are only suitable for areas with good coal structure and high degree of metamorphism; The single horizontal well and fishbone horizontal well with low cost and maintenance are suitable for popularizing.
【作者单位】：中国石油华北油田公司;中国石油华北油田公司勘探开发研究院;
【基金】：国家科技重大专项“山西沁水盆地煤层气水平井开发示范工程”(编号:2011ZX05061) 中国石油天然气股份有限公司重大科技专项“沁水煤层气田勘探开发示范工程”(编号:2010E-2208) 中国石油华北油田公司科技项目“马必东区块高效开发技术研究”(编号:2016-HB-M06)
【分类号】：TE37
【正文快照】： 沁水盆地南部是我国最主要的高阶煤储层发育区,目前已成功实现了煤层气的商业化生产[1-3]。但由于高阶煤储层具有低压、低孔、低渗、欠饱和及非均质性强等地质特点,以活性水压裂为主体的直井开发工程技术在不同地质条件的区块开发效果存在较大差异,有的地区单井日产气量超过3

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