摘要
利用常规物质平衡方程计算异常高压气藏水侵量,需要知道气井关井监测的稳定地层压力,然而在实际生产过程中,不可能随时关井监测地层压力计算气井水侵情况,且针对异常高压气藏,压力对计算结果影响很大。针对以上问题,利用流动物质平衡方程推导了一种计算异常高压气藏水侵量的新方法,运用无因次压力和采出程度图版,可以在气藏生产过程中不关井,以井底压力计算水侵量,并进行了实例验证。结果表明:新方法计算的水侵量比视地质储量法和图版法更准确,误差小于5%,准确率高,实用性强。该方法解决了异常高压气藏中,随着压力下降而引起的束缚水膨胀和孔隙体积减小等对水侵量带来的影响,为实际气井生产中计算水侵量提供了借鉴。
Continuous and steady formation pressure data from gas well shut-in monitoring is necessary to calculate the aquifer influx of abnormal high-pressure gas reservoir by traditional material balance equation. Actually, it is impossible to monitor formation pressure by shutting in gas well for aquifer influx calculation. In addition, the aqui- fer influx calculation is greatly dependent on formation pressure for gas abnormal high-pressure reservoir. In view of the above limitations, the material balance equation is used to deduce a new method for calculating the aquifer in- flux of abnormal high-pressure gas reservoir. The plates of dimensionless pressure and recovery degree and bottom- hole pressure are used to calculate the aquifer influx without shutting in gas well, which is also verified in a field case. Research demonstrates that Comparing with the aquifer influx calculations from apparent geological reserve and plate methods, this new method could provide a more accurate and practicable calculation and the corresponding calculation error is less than 5%. The effects of bound water swelling and pore volume reduction result from pressure drawdown are also taken into consideration in this new aquifer influx calculation, which could provide a reference for the field aquifer influx calculation of gas well.
出处
《特种油气藏》
CAS
CSCD
北大核心
2017年第6期139-142,共4页
Special Oil & Gas Reservoirs
基金
国家"十三五"重大专项"土库曼斯坦阿姆河右岸裂缝孔隙(洞)型碳酸盐岩气藏高效开发关键技术研究与应用"(2017ZX05030003)
关键词
物质平衡方程
异常高压气藏
水侵量
井底压力
material balance equation
abnormal high-pressure gas reservoir
aquifer influx
bottom-hole pressure
