水平井测压深度对压力解释的影响探讨

DISCUSSION ON THE INFLUENCE OF THE MEASURED PRESSURE DEPTH ON THE PRESSURE INTERPRETATION FOR THE HORIZONTAL WELL

为了准确测试和解释水平井的地层压力,采用管柱输送存储式测试技术,将压力计送入水平井水平段、造斜段、垂直段等不同位置上,获得准确测压资料。通过对水平井不同位置上的实测压力资料分析,探讨了水平井测压深度对资料录取和解释结果的影响,并建立了垂直井段与水平井段压力的折算方法。结果表明:折算后的垂直井段与水平井段压力曲线完全重合;在不含气的条件下,只要压力计沉入液面,压力测量位置对解释结果的影响可通过压力折算消除,从而准确解释地层压力。该成果为水平井压力试井施工深度的确定提供了试验依据。

In order to test and interpret the formation pressure accurately for horizontal wells,with the help of the tube-column transmission storage testing technology,the pressure gauge was sent into the horizontal section,the slant section,the vertical section and other different positions to obtain the accurate pressure measurement data.Through the analyses of the measured pressure data in different positions of the horizontal wells,the influences of the pressure measured depth on the data acceptance and interpretation results were discussed,and moreover the reducing and converting methods of the vertical and horizontal section pressures were developed. The achievements show that the pressure curve of the vertical well section after the conversion is completely coincided with that of the horizontal well section; under the non-gas-bearing condition,only that the pressure gauge dived into the liquid surface,the influences of the pressure measured position on the interpreted results can be eliminated by the pressure conversion,thus the formation pressure can be accurately described and characterized. The achievements have provided the testing evidences for the determination of the operating depth of the pressure well test of the horizontal well.