分支水平井试井压力分析  

Well Test Pressure Analysis on Multilateral Horizontal Wells

作　　者：张利军[1] 程时清[1] 

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室,北京昌平102249

出　　处：《石油钻探技术》2009年第1期23-28,共6页Petroleum Drilling Techniques

基　　金：国家高技术研究发展计划"863计划"项目"特殊结构井开发油藏工程技术"(编号:2006AA09Z338)资助

摘　　要：在平面源函数的基础上,利用坐标平移和坐标旋转的方法推导了无限大平面中任意方向一个线段源的瞬时源函数,根据Green函数和Newman乘积,通过压力叠加,得出了一般情形下分支水平井的井底压力。利用Laplace褶积对井底压力考虑了井储效应和表皮效应,绘制了各类复杂结构井的试井曲线,并分析了分支井各参数对试井曲线的影响以及不同形状分支和不同边界条件下复杂结构井的试井曲线。分支长度越短,则驼峰越高,第一径向流持续时间越短;分支井距顶底边界越近,第一径向流出现的时间越早;不同井底的多水平井表现为水平井越多,驼峰越低,第一径向流出现的时间也就越早;不同分支试井曲线反映出最终压力导数为N/2。利用该求解方法能较容易地求得任意位置分支的压力分布,且求解过程不需采用离散方法,求解方法更简洁,计算速度更快。On the basis of plane source function, an instantaneous source function of a linear section source which has arbitrary orientation in infinite plane is derived using coordinate transition and coordinate rotation methods. The solution of bottomhole pressure of general multilateral horizontal wells is obtained using Green＇s function, Newman＇s product method and superposition. The wellbore storage and skin effect are considered. The pressure and its derivate of all kinds of complex structure wells are plotted. The im- pact of multi-branched horizontal wells on pressure curves is analyzed. The pressure and its derivative at different multilateral wells and different boundaries are analyzed. The shorter the length of multilateral well, the higher the hump and the shorter the time of the first radial flow. The smaller the distance be tween the top and bottom edges of well, the earlier the appearance of first radial flow. The more the hori- zontal wells in different bottom hole of well, the lower the hump and earlier the appearance of first radial flow. The pressure derivate curve is N/2 at last for different multilateral wells. The method proposed in this paper is easy and convenient without discrete method and the computation is faster.

关 键 词：分支井 水平井 试井压力 格林函数 

分 类 号：TE353[石油与天然气工程—油气田开发工程]