CAJ | 학술논문

雷64区块为巨厚块状稀油油藏，自2008年注水开发至今，地层亏空加大，含水上升速度较快且水窜严重，而通过水井停注或下调配注控制含水上升的效果并不明显。为此，针对水驱效果较差问题，开展了老井再利用注氮气气顶驱试验。研制了1种注氮气完井管柱。该管柱主要使用了Y521封隔器以满足井底注气压力较高的需求。管柱坐封后，在油套环空内灌清水至井口以下100 m左右，起到平衡封隔器下压差作用；此外，严格对老井进行套管试压及固井质量检查，尽可能避免试注过程中的安全隐患。现场应用结果表明，该管柱性能可靠，注氮气试验期间井口始终无刺漏，受效油井单井增油可达9 t/d，初步实现了稳油控水的目的，为后期注氮气驱试验及设计提供了可靠的依据。
뢰64구괴위거후괴상희유유장，자2008년주수개발지금，지층우공가대，함수상승속도교쾌차수찬엄중，이통과수정정주혹하조배주공제함수상승적효과병불명현。위차，침대수구효과교차문제，개전료로정재이용주담기기정구시험。연제료1충주담기완정관주。해관주주요사용료Y521봉격기이만족정저주기압력교고적수구。관주좌봉후，재유투배공내관청수지정구이하100 m좌우，기도평형봉격기하압차작용；차외，엄격대로정진행투관시압급고정질량검사，진가능피면시주과정중적안전은환。현장응용결과표명，해관주성능가고，주담기시험기간정구시종무자루，수효유정단정증유가체9 t/d，초보실현료은유공수적목적，위후기주담기구시험급설계제공료가고적의거。
Lei 64 Block is thick-layer massive thin-oil reservoir. Since water lfooding development in 2008, it has been faced with increasing formation depletion, faster water cut rising rate and serious water channeling. Water injection well shutdown and injection allocation reduction are implemented to control the water-cut increase, but the effect is limited. Therefore, a nitrogen injection gas-cap drive experiment is implemented against the poor water lfooding effect. The new developed nitrogen injection completion string mainly uses Y521 packer to meet the requirement for high bottom-hole injection pressure. After the packer setting of pipe string, clean water is injected through casing annulus up to 100 m below the wellhead to balance the differential pressure below the packer. Besides, the casing pressure test and cementing quality inspection on old wells were performed strictly to avoid the potential safety hazards in the injection process as far as possible. The ifeld test shows that the pipe string has a stable performance during the nitrogen injection, with no leak-age at wellhead. For the affected production wells, the single well gets an average daily increased oil production of 9t. This primarily achieves the goal of oil production stabilizing and water cut control, and provides guidance for future nitrogen injection tests and design.