考虑水侵的异常高压气藏流动物质平衡

Flow mass balance in overpressured gas reservoirs considering water influx

蔡珺君 唐青松 欧家强 袁权 邓庄 甘笑非

中国石油西南油气田分公司川中油气矿，四川 遂宁 629000

Central Sichuan Division, Southwest Oil & Gas Field Company, PetroChina, Suining 629000, China)

异常高压气藏开发早期难以及时评价水侵量大小，会导致对气藏水体能量认识滞后和开发技术对策不清等一系列问题。文中通过对气井产水后产能方程修正，并与异常高压气藏产能方程和物质平衡方程联合求解，建立了考虑水侵的异常高压气藏流动物质平衡理论，且将气井生产划分为未水侵阶段、水侵早期以及产水阶段，绘制流动物质平衡法水侵诊断图，提出通过拟合未水侵阶段的水侵动态诊断点，对水侵早期以及产水阶段的水侵量进行定量评价，使得压力测试资料短缺不再成为水侵量计算的瓶颈。该方法已在国内安岳气田磨溪区块龙王庙组气藏进行了应用，应用结果符合气藏地质特征和生产动态认识，验证了其可靠性。

It is difficult to evaluate water influx in time in the early stage of overpressured gas reservoir development, which will lead to a series of problems such as lagging understanding of water body energy and unclear strategy of developing technology. In this paper, the flow material balance(FMB) theory of overpressured gas reservoir with water influx is established by together solving the deliverability equation correction after water production, gas well deliverability equation and mass balance equation in overpressured gas reservoirs. In this method, the production of gas well is divided into stages of non water influx, early water influx and water production, and the water influx diagnostic chart of FMB method is also drawn. By fitting the dynamic diagnosis points in the stage of non water influx, the amount of water influx in early stage of water influx and water production stage is quantitatively evaluated, so that pressure test data can no longer become the bottleneck of water influx calculation. This method has been applied to the Longwangmiao gas reservoir in the Moxi Block of Anyue gas field. The application results conform to the geological characteristics of gas reservoir and the understanding of the production dynamics, and the reliability of the method is verified.

10.6056/dkyqt201905011