CAJ | 학술논문

郑408块为典型的强水敏稠油油藏,由于储层能量不足和水敏性强,采用天然能量开发、注防膨水开发和蒸汽吞吐开发效果较差.通过室内实验研究了CO2在郑408原油中的溶解作用,认识了CO2吞吐回采阶段渗流特征,基于数值模拟方法优化得到了郑408块CO2吞吐开发方案.研究表明,CO2溶于稠油后,可使稠油的体积大幅度膨胀,原油黏度将大大降低;CO2吞吐回采阶段,由于稠油黏度较高,CO2在原油中析出后以小气泡形式分散在原油中,形成“泡沫油”渗流状态,“泡沫油”可以提高稠油的流动能力,增加原油的弹性能量,降低地层压力下降速度;数值模拟结果表明,郑408块CO2吞吐周期注入量优化值为100 t,注气速度优化值为50 t/d.
정408괴위전형적강수민주유유장,유우저층능량불족화수민성강,채용천연능량개발、주방팽수개발화증기탄토개발효과교차.통과실내실험연구료CO2재정408원유중적용해작용,인식료CO2탄토회채계단삼류특정,기우수치모의방법우화득도료정408괴CO2탄토개발방안.연구표명,CO2용우주유후,가사주유적체적대폭도팽창,원유점도장대대강저;CO2탄토회채계단,유우주유점도교고,CO2재원유중석출후이소기포형식분산재원유중,형성“포말유”삼류상태,“포말유”가이제고주유적류동능력,증가원유적탄성능량,강저지층압력하강속도;수치모의결과표명,정408괴CO2탄토주기주입량우화치위100 t,주기속도우화치위50 t/d.
Zheng 408 Block is a typical strong water sensitive heavy oil reservoir. The recovery performance of natural drive, anti-swelling water flooding and steam huff and puff is unsatisfactory for the shortage of natural energy and strong water sensi-tivity. Based on indoor experiments,the dissolution of CO2 in heavy oil of Zheng 408 Block and the percolation characteristics in production period were studied. The optimization of development scheme was obtained by numerical simulation. The results show that the volume of heavy oil increases obviously and the heavy oil viscosity will decrease greatly after the dissolving of CO2. In CO2 huff and puff production period,CO2 precipitated in heavy oil disperses in oil like small gas bubbles because of high viscosity,which can be defined as“foamy oil”. Foamy oil can improve the flow ability of heavy oil,increase elastic energy and decrease the velocity of reservoir pressure drop. Numerical simulation results show that the optimal cyclic CO2 injection volume was 100 t,and the optimal injection rate was 50 t/d.