CAJ | 학술논문

塔河碳酸盐岩油藏非均质性强，溶洞是最主要的储集空间，裂缝主要起连通通道作用，储集体中流体以管流模式为主，储集体类型复杂导致对剩余油分布认识不清，前期主要依靠弹性和水驱开发，采收率较低。目前塔河油田缝洞型油藏注水开发后期面临挖潜困难、剩余油储量难以动用的情况，注氮气驱油工艺的提出为解决这一难题提供了思路和方法。通过对注入气源的选择、地面注入工艺的优化、井口及管柱优化，成功实现了气水混注降压工艺及多轮次注气-机抽生产转换作业，节约了成本，提高了生产时效，减少了施工风险。该研究为碳酸盐岩油藏注气提高采收率工作提供了新的借鉴。
탑하탄산염암유장비균질성강，용동시최주요적저집공간，렬봉주요기련통통도작용，저집체중류체이관류모식위주，저집체류형복잡도치대잉여유분포인식불청，전기주요의고탄성화수구개발，채수솔교저。목전탑하유전봉동형유장주수개발후기면림알잠곤난、잉여유저량난이동용적정황，주담기구유공예적제출위해결저일난제제공료사로화방법。통과대주입기원적선택、지면주입공예적우화、정구급관주우화，성공실현료기수혼주강압공예급다륜차주기-궤추생산전환작업，절약료성본，제고료생산시효，감소료시공풍험。해연구위탄산염암유장주기제고채수솔공작제공료신적차감。
Tahe carbonate reservoir shows strong heterogeneity. The cavern is the primary reservoir space while fracture is mainly plays a role of connecting channel in this reservoir. The lfuids in reservoir are mainly taking the form of pipe lfow model. Complex reservoir type lead to the remaining oil distribution is unclear and early development mainly relies on elastic drive and water lfooding with low recovery efifciency in this oilifeld. At present, this fractured-vuggy reservoir within later stage of water lfooding faces the dififculties of potential tapping and remaining oil reserves dififcult to use, and nitrogen injection for oil lfooding process provides an ideas and methods to solve this problem. Through injecting gas source selection, optimization of injection process on the ground and wellhead and string optimization, the technique successful realizes the gas-water mixed injection pressure decreasing technology and multi-turn gas injection and machine pumping switching. The implementation of this technology saves the cost, and improves production efifciency and reduces the safety risk. The research provides a new idea and method for gas injection enhancing oil recovery efifciency of carbonate reservoir.