CAJ | 학술논문

FS-3井是位于济阳坳陷构造带上的1口埋藏深、裂缝发育的异常高温井,对储层改造施工的压裂液以及对地层破裂压力的预测等都提出了极高的要求.针对FS-3井的地质特征进行了储层改造的技术难点分析,在大量实验测试的基础上,优选出耐高温、高黏度且能满足150℃高温的低摩阻延迟交联液体系.通过室内岩心实验,利用储层应力计算模型预测了地层破裂压力和压裂施工压力.同时,采用粉砂降滤失、大排量施工、适当增加前置液用量、前置液阶段伴注液氮帮助返排等技术措施,完成了FS-3井的压裂施工设计,并进行了现场实施.最后,利用压裂施工曲线、压后排液及压后产量测试资料,完成了FS-3井压裂施工资料的评估分析,达到了预期效果.该成果对异常高温储层的压裂改造设计和施工方案的形成具有指导意义.
FS-3정시위우제양요함구조대상적1구매장심、렬봉발육적이상고온정,대저층개조시공적압렬액이급대지층파렬압력적예측등도제출료겁고적요구.침대FS-3정적지질특정진행료저층개조적기술난점분석,재대량실험측시적기출상,우선출내고온、고점도차능만족150℃고온적저마조연지교련액체계.통과실내암심실험,이용저층응력계산모형예측료지층파렬압력화압렬시공압력.동시,채용분사강려실、대배량시공、괄당증가전치액용량、전치액계단반주액담방조반배등기술조시,완성료FS-3정적압렬시공설계,병진행료현장실시.최후,이용압렬시공곡선、압후배액급압후산량측시자료,완성료FS-3정압렬시공자료적평고분석,체도료예기효과.해성과대이상고온저층적압렬개조설계화시공방안적형성구유지도의의.
The well FS-3, located in the structural belt of Jiyang sag, is ultra-deep and targets to the reservoir with abundant fractures and abnormal high temperature, thus it presents a high requirement for fracturing fluid and formation fracture pres-sure forecast. Technical difficulties in reservoir stimulation have been analyzed according to the geological characteristics of the well FS-3, a system of low friction resistance and delayed crosslinked fracturing fluid with high viscosity even at the tempera-ture as high as 150℃ was optimized on basis of substantial experimental data. Through core experiment, formation breakdown pressure and pumping pressure were calculated using the reservoir stress calculation model. Meanwhile, other technological measures including fluid loss agent, high pumping rate, high pad volume, and injecting liquid nitrogen were adopted in the de-sign of fracturing program, and fracturing operation was successfully carried out in field conduct. Finally, the effect of fractu-ring treatment was proven to be good through fracturing curve evaluation and the analysis of postfrac fluid flowback and gas flow rate. It shows that this study is quite significant to the design of fracturing treatment and construction program.