煤层气藏水平井氮气钻井优化设计方法及应用

doi:10.3969/j.issn.1006-6535.2025.02.019

摘要/Abstract

摘要： 针对雨旺煤层气藏存在井漏、煤层水敏、煤粉堵塞等问题,通过自主研发的氮气钻井软件,建立适合煤层气氮气钻井的注气参数计算模型和摩阻扭矩计算模型,明确注气量与注入压力、不同工况下的摩阻扭矩、钻柱的冲蚀磨损等施工参数计算方法,对水平井氮气钻井技术的钻具进行分析选择,并在云南雨旺区块钻探1口前期定向试验井和1口水平生产试验井。实际施工过程中,注入压力计算值与实际值误差均在10%以内,钻具未发生因摩阻扭矩和冲蚀磨损导致的事故,机械钻速达到11.64 m/h,达到邻井钻速的3倍,验证了软件具有较高的准确性。该研究可为煤层气藏氮气钻井提供借鉴。

关键词: 煤层气, 水平井, 氮气钻井, 摩阻扭矩, 冲蚀, 注气量, 雨旺区块

Abstract: In response to issues such as wellbore leakage, coalbead water sensitivity, and pulverized coal plugging in the Yuwang coalbed methane reservoir, a nitrogen drilling software was independently developed. Suitable gas injection parameter calculation models and friction torque calculation models for coalbed methane nitrogen drilling were established. The calculation methods for construction parameters such as gas injection volume, injection pressure, friction torque under different working conditions, and erosion wear of the drill string were clarified. The drilling tools for horizontal well nitrogen drilling technology were analyzed and selected, and one directional test well and one horizontal production test well were drilled in the Yuwang Block in Yunnan. During the actual construction process, the calculated injection pressure values were within 10% error range of the actual values. No accidents occurred due to friction torque and erosion wear of the drilling tools. The mechanical drilling speed reached 11.64 m/h, which is three times the drilling speed of the adjacent wells, verifying the high accuracy of the software. This study provides a reference for nitrogen drilling in coalbed methane reservoirs.

Key words: coalbed methane, horizontal wells, nitrogen drilling, friction torque, erosion, gas injection, Yuwang Block

中图分类号:

TE242

谭章龙, 张林强, 邵明仁, 王春鹏, 李小龙, 周璐, 杨浩. 煤层气藏水平井氮气钻井优化设计方法及应用[J]. 特种油气藏, 2025, 32(2): 145-153.

TAN Zhanglong, ZHANG Linqiang, SHAO Mingren, WANG Chunpeng, LI Xiaolong, ZHOU Lu, YANG Hao. Optimized design method and application of nitrogen drilling for horizontal wells in coalbed methane reservoirs[J]. Special Oil & Gas Reservoirs, 2025, 32(2): 145-153.

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