分层采油井测试工具井下受力计算及分析

Downhole Stress Calculation and Analysis of Testing Instruments for Separate Layer Production Wells

针对分层采油井在进行各层段配产时,现用测试仪器与井下工具间过流间隙较小,导致采油井产出液对测试仪器产生较大的上顶力,测试仪器下放不到位,严重影响了测量准确性的问题,对分层采油井测试工具井下受力进行了计算和分析。通过生产工况下测试仪器受力研究,建立产出液在测试仪器与配产器环空流动的数学模型,对边界条件及测试仪受力进行分析,选取试验数据对数学模型进行了数值计算,确定出了不同排量下的测试仪器最大配重为22.45kg。利用该数值计算结果,现场试验20口井,测试仪器均下放到位,对接成功率达100%。过环空分层配产测试的顺利进行,有效提高了采油井测试精度及效率。

During the each layer's allocation in the separate layer production wells,the flow clearance between the currently used testing instrument and downhole tool is relatively small that results in larger lift force of liquid produced from oil wells over the instrument.The instrument could not run into the desired position,which severely affects the measurement accuracy of the instrument.Downhole stress of testing instruments was calculated and analyzed for separate layer production wells.Based on the research of testing instruments'stress under production conditions,the flow mathematical models of produced liquid between the testing instrument and production flow regulator were set up,and the boundary7 condition and the stress of the testing instrument were analyzed.The mathematical models were calculated by the selected data,and maximum additional weight of testing instrument was confirmed as 22.45kg under different flow rate.The instrument has been applied to 20 wells according to the numerical calculation,and all testing instruments had run into the desired position with 100%success ratio.The prosperous application of separate layer allocation through annulus can effectively enhance the testing accuracy and efficiency in production wells.