煤层气水平连通井钻井技术

2010-10-21王彦祺

中国煤层气 2010年2期

关键词：水平设计

王彦祺

(华东石油局工程技术设计研究院,江苏 210031)

煤层气水平连通井钻井技术

王彦祺

(华东石油局工程技术设计研究院,江苏 210031)

采用水平井技术开采煤层气具有增加有效供给范围、提高导流能力、提高单井产量和采出程度等优点。中石化华东分公司在沁水盆地和顺区块实施的第一个由和1井、和平1井组成的水平连通井组,通过采用带聚焦伽玛的电磁波随钻测量系统(EM-MWD)、低转速高扭矩马达、强磁导向系统(RMRS)等先进工具仪器和随钻地质导向、两井远端连通、储层保护等先进技术,成功地实现了两井远端一次连通。本文介绍了该井组的设计与施工情况,并对今后在该地区实施水平连通井提出了建议。

沁水盆地煤层气水平井设计施工连通技术

Abstract:The adoption of horizontal well technology in the CBMfield is of advantage to increase the effective scope of supply,enhance the conductivity,improve the production&oil recovery and so on.A horizontal connected well group is composed of the well He 1 and Heping 1 in the Heshun block Qinshui Basin drilled by SINOPEC East China branch.It has successfully achieved connection of the two remote wells by adopting the advanced tools such as electromagnetic waves MWD system with a focusing gamma(EM-MWD),motors with low speed and high torque and magnetic guidance system(RMRS).At the meanwhile the advanced technology has provided strong support such as the Geosteering drilling technology,the remote connectivity technology and the reservoir protection technology.This article describes its design and operation,and brings up some advices for the future operation of the horizontal connected well in the block.

Keywords:Qinshui basin;coalbed methane(CBM);horizontal well;design;operation;connectivity technology

为了进一步探索沁水盆地和顺区块采用水平井开采煤层气的效果,中石化华东分公司决定在该区块实施一口水平连通井。通过由和1井、和平1井组成的水平连通井组的设计与施工,初步形成在该地区实施煤层气水平连通井的设计与施工技术。

1 和1井概况

和1井位于山西省和顺县,属沁水盆地北部榆社-武乡构造带,是一口煤层气探井,同时作为和平1水平连通井组的排采井。该井2008年9月25日一开,2008年10月14日完钻,完钻井深560m,其井身结构为φ244.5mm表层套管 ×36.45m+φ177.8mm生产套管×550.47m,在目的层位石炭系太原组15#煤503.93～512.34m处下入玻璃钢套管1根,固井后对505.50～509.00m井段进行了扩孔,扩空直径为500mm。