渤海南部河流相油田四维试井分析技术

4D well test analysis for fluvial oil fields in the Southern Bohai Sea

针对试井解释结果精度不高和多解性的问题,结合渤海南部河流相油田特点,以及生产井大多采用永久压力计生产的实际,在常规试井解释模型的基础上,基于空间拓展和时间推移尺度,提出四维试井分析技术。根据多层渗流理论、压力生产史或同井不同时期压力恢复资料,分别在空间上、时间上对试井模型进行约束。经对调整井D24井进行分析,试井解释四层段表皮系数分别为19.9、20.0、15.1和14.2,与实际地层严重污染相符,建议酸化作业后,该井日产油由30 m^3提高至80 m^3;应用该技术,定向生产井B27井前后进行了3次时间推移试井,通过调整井的实施,新增原油地质储量48.41×104 m^3。该技术可有效判断井污染情况、储层边界情况和物性参数,有效指导油水井措施及井网调整。

To improve the accuracy and reduce the ambiguity of well test interpretation results,on a conventional well test interpretation model,a 4D well test analysis technology is proposed by expanding space and time ranges according to the characteristics of the fluvial oil fields and the fact that most production wells are producing with permanent pressure gauges in the Southern Bohai Sea.According to the multi-layer seepage theory,the pressure production history or pressure buildup data in different periods of the same well,the well test model is constrained in space and time respectively.In Well D24,the skin coefficients of four sections are 19.9,20.0,15.1 and 14.2,respectively.These results are consistent with the seriously polluted sections.After acidizing stimulation,the oil production of the well increased from 30 m^3 to 80 m^3.Using this technology,the directional production well B27 has been tested three times.In the adjusted well,the geological oil reserves increased by 48.41×104 m^3.This technology can effectively judge well pollution,reservoir boundary and physical properties,and effectively guide how to implement well stimulations and adjust well patterns.