同层补孔压裂技术在特低渗透油田的应用

Application of Same Layer Re-perforating Fracturing Technology in Extra-low Permeability Oilfields

坪北油田属于特低渗透油藏,砂体发育,油层厚度大,整体上储层采用笼统压裂以动用油层产能,但是笼统压裂对厚油层的改造并不充分,测井显示剩余油富集,为进一步有效挖掘剩余油,提高单井产量,提出了厚油层同层补孔压裂技术。通过分析厚油层同层补孔压裂技术的难点和主要影响因素,优化了射开程度和压裂施工参数,充分挖掘了剩余油,该技术在现场成功应用9井次,平均单井增油量提升1.5倍,增油效果显著,保证了特低渗透致密砂岩油藏高效开发。

Pingbei Oilfield, with well-developed sandstone bodies and great pay thickness, is characterized by extra-low permeability reservoirs. As a whole, the integral fracturing has been used to improve the producing degree, but the stimulation effect on the thick reservoir was not ideal as evidenced by the enrichment of remaining oil on logging data. In order to effectively tap the potential of remaining oil, increase the production of well, the same layer re-perforations fracturing technology was applied in the development of the thick reservoirs. Based on the analysis of technical difficulties and major influence factors in the operation, the perforating degree and construction parameters were optimized for remaining oil reservoir exploitation. This technology has been applied in 9 wells/times, and the average single well productivity increased 1.5 times, which showed obvious effects of enhanced production of oil and ensured the high-efficient development of extra-low permeability tight sandstone oilfields.