南海东部A油田B带气顶油藏高效开发方式研究

High Efficient Development of Gas Cap Reservoir in Zone B of A Oilfield in the Eastern South China Sea

A油田B油藏是南海东部首个发现的带有凝析气顶油藏,如何有效高效开发成为亟须解决的问题。本文通过PVT相态拟合、气井动态拟合,储量拟合与过路井饱和度拟合,利用数模对开发方式、井型、井位与井长、注气井位置、回注量、注气时机等参数进行了优化。结果表明,循环注气时水平井远好于直井开发;井位置在油藏中部、井长400 m、注气井位置越靠近油藏生产井开发效果最好;注入时机越早,回注量越大效果越好。由此可见,注气开发技术是提高高含水高采出程度油藏采收率的有效方法。鉴于循环注气开发技术的灵活性、适应性,循环注气为南海东部带气顶油藏开发提供新的思路。

The B reservoir of A oilfield is a condensate gas cap reservoir first discovered in the eastern part of the South China Sea.How to effectively develop the reservoir becomes an urgent problem to be solved.In this paper,PVT phase state fitting,the gas well dynamic fitting,the reservoir fitting and the saturation of the passing well are fitted,using the digital model to optimize the development model,well type,well position and length,gas injection well position,reinjection amount,and gas injection timing.The results show that,th e gas injection is more efficient than the vertical well development.The well position is in the middle of the reservoir,the depth of well is 400 meters,the closer the position is to the reservoir production well,the better the effect.The earlier the injection timing,the better the reinjection amount.It can be seen that gas injection technology is an effective method to improve the recovery efficiency of high water cut and high recovery degree reservoirs.In view of the flexibility and adaptability of cyclic gas injection technology,cyclic gas injection provides a new idea for the development of gas cap reservoirs in the eastern South China Sea.