带油环底水凝析气藏开发方式优化及均衡开采对策——以东海盆地西湖坳陷CX北区块为例

发布时间：2018-04-24 02:20

本文选题：气顶底水油气藏 + 气顶油环流体相态　；参考：《天然气工业》2017年06期

【摘要】：东海盆地西湖坳陷CX北区块H3b、H3c油气藏为海上带油环底水凝析气藏,采用油气同采且初期优先采油的开发方式共设计了4口水平井,水平段位于油气界面以下的油环上部。为了尽快回收投资,该气藏在开发初期采用较高速度开采,油气井生产动态开始出现产量递减加快、气油比快速上升、含水率快速上升等现象,表明气顶和油环开采出现不均衡状态,而且位于油环下部的井已开始出现底水锥进。为此,基于该区块油气藏地层油气流体相态特征,同时结合油气井生产动态特征,分析反凝析、气顶气下窜、底水上升锥进等因素对该油气藏开发动态的影响,进而提出对策:(1)利用气顶气和油环油溶解气的弹性能量以及边底水天然水驱方式来开采油气藏,并合理控制采油采气速度,尽可能地实现油气藏的均衡开采;(2)由于过早打破了油气井的均衡开采状态,导致了气顶气过早下窜和边底水过早侵入,需要通过实时调整采油气速度来平衡开采状态,从而使得油气藏气油比和含水率得到有效控制。实施结果表明:上述对策的成功应用,确保了凝析气藏进入了稳定均衡的开发状态。
[Abstract]:The H _ 3b _ H _ 3c reservoir in CX North Block of the West Lake Depression in the East China Sea basin is a bottom water condensate gas reservoir with oil and gas belt. Four horizontal wells are designed by using the development mode of oil and gas co-production and initial preferential oil production. The horizontal section is located in the upper part of the oil ring below the oil-gas interface. In order to recover investment as soon as possible, the gas reservoir adopts high speed production at the early stage of development, the production performance of oil and gas wells begins to decrease rapidly, the ratio of gas to oil rises rapidly, the water cut rises rapidly, and so on. It shows that the gas cap and oil ring production are unbalanced, and the bottom water coning is beginning to appear in the well located in the lower part of the oil ring. Therefore, based on the phase characteristics of oil and gas reservoirs in this block, and combining with the production characteristics of oil and gas wells, this paper analyzes the effects of reverse condensate, gas cap gas channeling and bottom water rising coning on the development performance of this oil and gas reservoir. Furthermore, the countermeasures: 1) utilizing the elastic energy of gas cap gas and oil ring dissolved gas and the natural water drive mode of edge and bottom water to exploit oil and gas reservoirs, and reasonably controlling the oil and gas production rate, Realizing balanced exploitation of oil and gas reservoirs as far as possible) due to the premature breaking of the equilibrium production state of oil and gas wells, which leads to premature gas cap gas channeling and early invasion of side and bottom water, it is necessary to balance the production state by adjusting the oil and gas production rate in real time. Thus, the ratio of oil to gas and water cut can be controlled effectively. The results show that the successful application of the above countermeasures ensures that the condensate gas reservoir enters a stable and balanced development state.
【作者单位】：中海油能源发展股份有限公司工程技术分公司中海油实验中心上海实验中心;
【基金】：国家科技重大专项“厚层非均质性大型气田有效开发关键技术集成应用”(编号:2016ZX05027004-006)
【分类号】：TE37

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