束鹿页岩油密切割压裂技术——以SY302X井为例

Intensive fracturing technology for Shulu shale oil:a case study on well SY302X

为评价束鹿凹陷中洼槽沙三下段砾岩体致密油气藏,最大程度释放储层产能。钻探水平井SY302X井,水平段长1160 m,储层钻遇率95.60%,为充分改造储层,在总结以往大型体积酸压改造经验的基础上优选无限级滑套的改造工艺,段间距缩短到10 m左右,可实现对水平段密切割压裂。该井使用140 MPa高压管汇撬、140型井口、5500 m^(3)储液池、连续输砂装置等设备,并完成26段压裂,单段最大液量达1850.2 m^(3),单段最大加砂51 m^(3),全井累计泵注液体2.41×104 m^(3),累计加砂956.6 m^(3)。该井的顺利完成为束鹿凹陷非常规储层改造积累了宝贵经验,为后续改造指明了方向。

To evaluate the tight oil and gas reservoirs in the lower Sha3 member in central Shulu sag,and maximize reservoir productivity,a horizontal well,SY302X,was drilled with a horizontal section length of 1160 m and a reservoir encounter rate of 95.60%.In order to effectively stimulate the reservoir,based on summarization of the previous experience in large-scale acid fracturing stimulation,an infinite-stage sliding sleeve stimulation process was selected.With this process,the interval spacing was reduced to approximately 10 m,enabling intensive hydraulic fracturing in the horizontal section.For this well,equipment such as a 140 MPa high-pressure manifold,140-type wellhead,5500 m^(3)fluid storage tank,and continuous proppant injection system were utilized.A total of 26 fracturing stages were completed,with the maximum liquid volume in a single stage reaching 1850.2 m^(3)and the maximum proppant volume in a single stage reaching 51 m^(3).The well had a cumulative pumped fluid volume of 2.4×104 m^(3)and a cumulative proppant volume of 956.6 m^(3).The successful completion of this well accumulates valuable experience for unconventional reservoir stimulation in the Shulu sag,guiding future efforts in this area.