连续油管环空压裂在深部火成岩储集层的应用——以克拉玛依油田克81井区玛湖5井为例

Application of Annulus Fracturing Technology with Coiled Tubing in Deep Igneous Reservoirs:A Case Study of Well Mahu-5 in Wellblock K-81,Karamay Oilfield

克拉玛依油田克81井区火成岩储集层埋藏深、开发难度大,油井无自然产能,需要经过压裂、酸化,才能有增产效果。通过对储集层岩石力学、裂缝特征和压裂液体系对裂缝影响的分析,优化压裂方案,采用连续油管底封环空压裂工艺,以体积压裂方式大排量、高泵压压裂地层,形成沟通天然裂缝为主体的缝网结构,提高储集层导流能力,以获得高产,并在玛湖5井成功应用,为今后克81井区及类似油井后续开发提供借鉴。

The igneous reservoir of Wellblock Ke-81 in Karamay oilfield is characterized by deep burial,no natural productivity in oilwells,so there is generally no effect to increase oil production without fracturing and/or acidizing.On the basis of analyses of the rock me-chanics,fracture characteristics and the impact of fracturing fluid systems on fractures,the fracturing scheme is optimized,and coiled tub-ing bottom sealing annulus fracturing process is used to perform fracture network fracturing.Such a large displacement and high pump pres-sure fracturing can form fracture networks connecting natural fracures and improve flow conductivity in the reservoir for obtaining high oilproduction.The successful application of this technology in Well Mahu-5 will provide practical guidance for future development of Well-block Ke-81 and similar wells.