出砂油井用抽油泵初始间隙的选择

在我国油田的大部分抽油井中 ,抽油泵易损件都受到以石英砂为主的各种形式的磨损 ,而直径≤ 0 15mm的石英砂粒大部分都能通过滤砂器 ,进入油管被抽汲、携带出地面。为了防止砂粒卡泵、减轻砂粒对抽油泵柱塞 -泵筒摩擦副表面的磨损 ,出砂油井用抽油泵初始间隙δ0的选择应以较小间隙为原则。根据泵径和井下泵入口处的井液粘度 ,由公式δw=0 0 133D +0 0 73η计算泵的工作间隙δw。泵工作时 ,工作间隙δw 比初始间隙δ0 增大约 0 0 0 2mm。选泵时 ,泵的初始间隙为δ0 =δ　0w - 0 0 2 mm比较合适 ,热采油井不会发生因温升造成间隙减小而卡泵的现象

Selection of initialclearance of rod pump for sandy well

The subsurface pumps in sandy wells suffer mostly from abrasion of quartz sand. To prevent the pump from being stuck by sand grains and to reduce the abrasion of plunger-barrel frictional surfaces, minor initial clearance of pump should be selected. The clearanceδw can be calculated with the equation δw=0.013D1/3+0.07η1/3 based on the pump diameter D and fluid viscosity at the pump inletη. When in operation, the pump takes a working clearance 0~0.02mm larger than the initial clearanceδ0. Therefore, subsurface pumps should be selected according to the equationδ0=δw mm.