水平井井身轨迹对底水油藏开采效果的影响

建立了底水油藏水平井开采三维物理模型，通过改变水平井狗腿位置以及距底水高度，研究了水平井不同井身轨迹对水平井产能、底水与井筒压力梯度、含水率及采收率的影响。研究结果表明，凹型水平井狗腿远离跟部含水率上升较缓，无水采油期较长。凹型水平井狗腿位于中部时，狗腿深度较浅的模型采收率较高。注入冻胶堵剂成胶后底水开采，凹型水平井狗腿位于跟部的模型提高采收率幅度较高。实验结果符合实际油藏状况，为底水油藏水平井优化设计和现场堵水选井提供了参考。

A STUDY ON NON-ENGLISH MAJORS’ ENGLISH WRITING AND COLLEGE ENGLISH WRITING TEACHING

3D physical model for horizontal well production of bottom water oil reservoir is established in this paper.The influence of horizontal well trajectory on horizontal well deliverability,bottom water and well bore pressure gradient,water cut and recovery is studied by changing dogleg location in horizontal well and the distance from bottom water.Results show that water cut increases slowly when the dogleg is far from heel in concave horizontal well,and the period of water-free production is longer.When the dogleg in concave horizontal well is located in the middle,and the dogleg is shallow in depth,the recovery is high.After injecting gel plugging and recovering by bottom water drive,the degree of enhancing recovery is higher when the dogleg is located at the heel.Experimental result is coincident with practical oil reservoir,which provides meaningful reference for horizontal well optimal design and in-situ shutoff of bottom water oil reservoir.