川西水平气井靶点高差对排液的影响

随着川西低渗透致密气藏不断加大水平井开发力度,水平井气井逐渐增多,水平井井筒积液成为气藏水平井开发普遍存在的难题。应用水平井筒内流体由分层流向非分层流转变判别式,对影响水平段井筒携液的因素进行分析。分析表明:水平段井筒倾角越大、积液高度越高,水平井筒中气液两相流型更容易从层流转向非层流,水平段中的液体也就更容易被气流带出。虽然井筒倾角对气体临界流速的影响较小,但是井筒倾角越大,井筒内A靶点附近的积液高度越高,液体就更易被气流携带出水平段。通过实例分析也证明水平井AB靶点高差对气井排液有影响,B靶点比A靶点越高,越利于井底积液从水平段排出。

THE INFLUENCE OF TARGET POINT HEIGHT DIFFERENCE ON HORIZONTAL GAS WELL DELIQUIFICATION IN WEST SICHUAN

With the degree of horizontal wells development increasing,it is a common problem that horizontal wells accumulate fluid in wellbore.The factors of affecting horizontal gas well with fluid are analysized by using the discriminant that estimate fluid flow pattern from laminar into non-laminar.The result shows that the horizontal segment degree is greater and the hydrops height is,too,then fluid flow pattern is easier to become laminar from nonlaminar and the fluid is easier to be carried out from horizontal wells.The horizontal segment degree has little influence on gas critical flow rate,but if horizontal segment degree is greater,and the hydrops height of target A is also higher,the fluid is much easier to be carried out from horizontal wells.The example proves that the target point height difference between A target and B target has influence on deliquification.If B target is higher in position than A target,it is more favorable for the fluid to come out from horizontal wells.