非自喷油井压力恢复早期资料修正方法研究

Study on Rectification Method to Earlier Build Up Pressure Data of Well Testing in Non-Flowing Oil Well

对于压裂后非自喷油井,需要通过抽汲进行排液求产。由于抽汲求产结束后起出抽油杆,然后下存储式电子压力计井口关井测压力恢复,造成压力恢复早期数据缺失,导致压力恢复曲线形态变异,模型诊断困难,解释结果出现较大误差或者无法解释。在对压裂后非自喷抽汲油井压力恢复曲线变化规律研究的基础上,给出了描述关井后井底压力随时间变化的经验公式,对缺失的早期数据进行插值构建与修正,然后再与实测数据重新匹配,对匹配后的压力恢复数据进行解释,得到了较好的曲线形态特征,提高了压力恢复资料可解释率及解释结果的准确性。

For the post-fractured non-flowing oil wells,swabbing to flow and obtaining production is needed. Due to pulling out the rod after swabbing and acquiring production,then the mechanical pressure gauge is run into the well-bore for pressure buildup test with wellhead shutin that results in loss of earlier build up pressure data to make variation of buildup curve shapes and to be difficult to diagnose model,the explaining results appearing bigger error or not to be explained. Based on researching the change of pressure buildup curve for fractured non-flowing oil well,the empirical formula describing change curve of the pressure with time after shut-in bottom hole is obtained.And it is used to interpolate for constructing and correcting for the lack of early data. With matching the interpolated data and the measured data to explain,the better shape characteristics of pressure buildup has been obtained,which improves the explain rate and the accuracy of the results.