海上高导流分层防砂分层控聚技术

Offshore High Conductivity Layered Sand Prevention and Layered Polymerization Control Technology

针对胜利海上化学驱区块?准177.8 mm电泵井见聚后容易出现砂堵、聚堵,检泵周期缩短,影响化学驱开发效果的难题,研发了一种高导流分层防砂分层采油技术。该技术包含大通径低吸附分层防砂疏聚、小直径大推力管内分层控聚及电泵快速破聚三级控制,可实现长效采油。防砂采用低吸附技术可减少聚合物吸附量48.3%;管内小直径分采技术设计加强装置可实现泵下悬挂分采管柱,液控多级配产器可实现多开度大推力控制;管柱最大外径80 mm,比常规管柱缩小10%。电泵机组优化导叶轮结构及材质并增加剪切装置破碎老化聚合物,剪切率≥30%,提高聚驱导液能力。目前该技术已在胜利海上成功应用37口井,分采层数2~3层,平均单井日增油21.3 t,最大见聚质量浓度650 mg/L,仍能正常生产。满足了化学驱电泵井“低吸附、防堵、控聚”的生产需求,实现了海上电泵井的长效举升,具有广阔的推广应用前景。

To address the issue of electric pump wells with a diameter of 177.8 mm in the Shengli offshore chemical drive block,which are prone to sand blockage and accumulation,and the subsequent reduction in pump inspection periods,which in turn affects the chemical drive development effect,a high conductivity stratified sand control and stratified oil recovery technology has been developed.The technology comprises three control techniques,namely large-diameter low adsorption layer sand control and agglomeration,small-diameter and large-thrust tube layer control and electric pump rapid agglomeration,which are designed to facilitate long-term oil recovery.In the area of sand control,the use of low adsorption technology resulted in a reduction of the adsorption amount of polymer by 48.3%.The small diameter of the pipe separation technology was designed to reinforce the device,thereby enabling the suspension of the separation string beneath the pump.The hydraulic multistage production distributor facilitates multi-opening and large thrust control,with a maximum outside diameter of 80mm.The electric pump unit optimizes the structure and material of the guide impeller and increases the shear device to break down aged polymer and improve the conductivity of the polymer flooding.At present,this technology has been successfully applied in 37 wells in the Shengli Sea,producing two to three layers.The average daily oil increase per well is 21.3 t,with a maximum concentration of 650 mg/L,which is sufficient to maintain normal production.This technology is capable of meeting the production demands of"low adsorption,blockage prevention,and accumulation control"in chemical flooding pump wells,enabling the long-term lifting of offshore electric pump wells,and has considerable potential for further application.