煤层气井水平段气泡流时液相滞留效应及轨迹优化

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中图分类号：TE132.2 文献标志码：A 文章编号：1008-0562（2025）05-0513-07

Xiaoming，ZHAOYanwei，LIJunfeng，etal.Retentionefectsandtrajectoryoptimizationdesignoffluidsincoalbedmethane horizontalwellsctiosunderbubblefloegie[J]oualofaoingTchicalUnversity（NaturalSiece）25，4（5）19. DOI：10.11956/j.issn.1008-0562.20240420

Retention effects and trajectory optimization design of fluids in coalbed methane horizontal well sections under bubble flow regime NI Xiaoming'，ZHAO Yanwei'，LIJunfeng²，YANJin'，GUO Shengqiang²

{1.School of Energy Science and Engineering，HenanPolytechnic University，Jiaozuo ， China;2.Shanxi Lanyan Coalbed Methane Company Limited， Jincheng O48012， China）

Abstract：Aimingat theproblems ofunclear flow field distribution characteristics in thewellbore during the bubble flow stage of thecoalbed methane horizontal well section and unknown influence of the liquid retention effect，COMSOL Multiphysics software was applied to simulate the flow field distribution under four kinds of trajectorypaterns of the horizontalsection during thebubble flow state.This study analyzed the influenceof the bubbles on the liquid flow under diferent conditions such as trajectory pattrn of the horizontal wellsection and inclination angle，and optimized the trajectoryofboreholeofthe horizontal sectionofthecoalbed methane wells. Theresultsshow that with the increaseof dipangle，the stagnationefectofbubbleson liquid is thelargest in bow-type wells，followed by spoon-type wells and upward-dipping wells， and the influence of downward-dipping wells is the smallest. When the upward inclination angle of the coal seam is 8∘-25∘ ，the upward inclination type wellbore trajectory of 3∘-7∘ ispreferred;when the upward inclination angle of the coal seam is 0∘-8∘ ，the upward inclination type wellbore trajectory of 1∘-4∘ is preferred; when the downward inclination angle of the coal seam is 0∘-8∘ ，the downward inclination type wellbore trajectory of 1∘-4∘ is preferred. The research conclusions provide theoretical guidance for the optimal design of horizontal wellsection trajectories for coalbed methane.

Keywords：horizontal wellsection;bubble flow;horizontal well type; dipangle;wellbore trajectory;retention effect;flowfielddistribution

0引言

煤层气水平井具有达产速率快、采收率高、综合经济效益高等特点，已成为煤层气开发的主要井型之一[1-2]。（剩余11334字）