第38卷第3期 2016年5月
石
油
采
钻
工
艺
OIL DRILLING & PRODUCTION TECHNOLOGY
文章编号：10007393(2016)03040504
DOI: 10.13639/j-odpt.2016.03.025
一种煤岩储层保护装置的研制与应用
王风清韩军’王辰龙’张康’徐贵东”刘国强
Vol. 38 No. 3
May 2016
1.中石油煤层气有限责任公司临汾分公司；2.中国石油冀东油田公司南堡作业区；3.陕西鼎和源端环境工程有限公司
引用格式：王风清，韩军，主辰龙，张康，徐资东，刘国强，一种煤岩储层保护装置的研制与应用【』】，石油钻采工艺，2016， 38(3):405-408
摘要：煤常储层大的比表面积、较强的应力敏感和吸附能力导致其更易受到伤害，遇而影响煤层气采收率。为减少修井过程对爆岩储层遗成的伤害，设计了爆层气并用煤岩储层保护装置。该装置主要由单流间、中心管、弹策和弹策外管组成，单流间控制地层液向井筒单向流动，中心管、弹簧和弹簧外管相互配合，修井时可以利用压差的增大关用井筒内井液流道，实现隔绝储层的目的。前期在3口并进行了试用，作业后产气均恢复至原有水平，产气恢复时间缩短为原来的15%，说明该装置能有效隔绝储层，实现保护储层的目的，为煤层气井修并过程中的煤岩储层保护提供了新的方法和路
关键词：煤层气井；修井；煤岩储层保护装置
中图分类号：TE931*.2
文献标识码：B
Developmentand application of a coal reservoirprotection device WANG Fengqing', HAN Jun', WANG Chenlong', ZHANG Kang', XU Guidong', LIU Guoqiang 1. Linfen Branch of PetroChina Coalbed Merhane Compary Limited, Taiyiran, Sharxi 030000, China; 2. Nanpu Operation Area of PetroChina Jidong Oifeld Compamy, Tangrhat, Hebei 063200, Chinas 3. Sharanxi Dinghe Hinanvi Ervironmenfal Engineering Co. Lid., Xi'an, Shaanxi 710068, Chind
Citation: WANG Fengqing, HAN Jun, WANG Chenlong, ZHANG Kang, XUN Guidong, LIU Guoqiang. Development and ap-plication of a coal reservoir protection device [J] - Oil Drilling & Production Technology, 2016, 38(3): 405-408
Abstract: Coal reservoirs can be damaged easily due to the large specific surface area, high stress sensitivity and strong absorb-ability. Eventually, the coalbed methane (CBM) recovery factor is adversely affected. A coal reservoir protection device for CBM wells was developed to reduce the damage on coal reservoirs during the workover. According to its design, the valve assembly which is used to control the unidirectional flow of fluids in well, works together with the springs in central tube to shut in the flow path in hole with the increasing of pressure difference. In this way, the reservoir is isolated, while the CBM well can perform continuous stable production. The device was tested in 3 wells. As a result, it only took 15% of the original time for the gas production to recover to the previous level. This indicates that the device can isolate and protect the reservoir effectively. Furthermore, it provides a new method and idea for coal reservoir protection during the workover of CBM wells.
Key words: coalbed methane well; workover; coal reservoir protection device
与常规储层相比，煤岩比表面积大、吸附能力强、应力敏感性强、渗透率变化不可逆的特点决定了煤岩储层较常规储层更易受到伤害，在煤层气并开发与生产过程中，不仅钻完井和压裂会对煤岩储层
造成伤害，修井以及不合理的排采制度同样会造成不同程度的伤害，目前在国内，煤岩储层保护主要若重于钻完井和增产过程中，而修井过程中的储层保护还处于空白阶段（1-1)。
第一作者：王风清（1961-),2006年毕业于中国科学院力学研究所，现队事油气田开发和科技管理工作，教投频高级工程师。通讯地址：
(030000)山西省太原市小店区经济技术开发区龙盛街5号。电话；0351-7078669。E-mail：cyy_wfq@pterochina.com.cn
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