油气藏评价与开发 >
2020 , Vol. 10 >Issue 4: 59 - 62
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2020.04.009
双管柱筛管完井技术在沁水煤层气区块水平井开发中的应用
收稿日期: 2020-03-21
网络出版日期: 2020-08-07
基金资助
国家科技重大专项“沁水盆地高煤阶煤层气高效开发示范工程/煤层气水平井高效增产改造技术研究”(2017ZX05064002);国家科技重大专项“井下长钻孔气相压裂和地面井多缝压裂增透煤层气高效抽采技术研究与示范”(2016ZX05067006-002);国家自然科学基金重点支持项目“页岩和致密油气田高效开发建井基础研究”(U1762214);河南理工大学博士基金项目“低渗透松软煤储层煤层气水平井筛管完井机理研究”(B2017-63)
Application of double string screen completion in horizontal wells of Qinshui CBM Block
Received date: 2020-03-21
Online published: 2020-08-07
煤岩储层完井液伤害与水平井眼易坍塌是限制沁水地区煤层气水平井产量的主要因素,针对煤储层伤害与坍塌导致煤层气水平井低产、减产问题,利用双管柱筛管完井增产一体化技术,解决了煤层气水平井完井液对煤层伤害以及煤层裸眼井壁失稳问题。实现完井洗井作业一趟钻,提高煤层气单井产量,延长煤层气井稳产周期。煤层气水平井双管柱完井结构由外层筛管系统和内层冲管系统组成,外层筛系统可以实现长期支撑井壁,防止井筒坍塌,内部冲管系统可建立完井液循环通道,实现水力喷射、消除污染、冲砂洗井功能,降低筛管下入遇阻风险,提高筛管一次性下入成功率。该工艺发展为沁水煤层气区块水平井开发主要完井方式,已开发外径?73 mm、?89 mm与?110 mm等系列的筛管及配套工具,该技术现已推广应用331口煤层气水平井,相比2014年之前的裸眼水平井,筛管完井水平井稳产周期提高5倍以上,15#煤层水平井单井日产气量超过1 000 m 3,从根本上解决了15#煤层气开发的技术难题,形成了适合沁水煤层气区块水平井高效开发新模式。
鲜保安 , 王力 , 张晓斌 , 毕延森 , 张洲 . 双管柱筛管完井技术在沁水煤层气区块水平井开发中的应用[J]. 油气藏评价与开发, 2020 , 10(4) : 59 -62 . DOI: 10.13809/j.cnki.cn32-1825/te.2020.04.009
The damage of coal-rock reservoir completion fluid and the easy collapse of horizontal wells are the main factors limiting the output of coalbed methane horizontal wells in Qinshui area. In terms of the resulting problems of low horizontal well production and production reduction, the integrated technology of dual-tubing screen completion and production increasing is used to solve the problems of damage to coal seam caused by completion fluid of horizontal wells of coalbed methane and the instability of open hole wall of coal seam. Therefore, one-trip drilling of completion and flushing operation is realized, the output of single CBM well is improved, and the stable production cycle of a CBM well is extended. The dual tubing completion structure of a horizontal CBM well consists of an outer screen system and an inner flushing system. The outer screen system can realize the long time support of the shaft wall and prevent the collapse, while the inner flushing system can establish the completion fluid circulation channel, realize the function of hydraulic jet, pollution prevention, sand flushing and well cleaning, reduce the resistance encountered of screen pipe entering, and improve the success rate of screen pipe entering in just one-time. This process is the main method to develop horizontal wells in Qinshui CBM Block. A series of screen pipes and supporting tools with an outer diameter of 73 mm, 89 mm and 110 mm have been developed, and this technology has been popularized and applied in 331 horizontal CBM wells. Compared with the open-hole horizontal wells developed in the year before 2014, the stable production cycle of the screen completion horizontal wells is increased by more than 5 times, and the single well production of the horizontal wells of 15# coal seam has exceeded 1 000 m 3 to the fundamentally solve technical difficulties in development. A new efficient development mode suitable for the horizontal wells in the refreshing water coalbed methane block is formed.
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