气藏水平井边水突破时间预测

Prediction on water breakthrough time of horizontal well in gas reservoir with edge water

近年来气藏水平井开发技术越来越成熟,然而出水是影响气藏开发的重要问题。出水分为边水和底水,国内外对底水锥进进行了大量研究,而对边水气藏水平井见水时间预测的研究相对较少。文中对边水气藏水平井边水突破时间的预测方法进行了研究,通过数学推导,得到了边水气藏水平井边水突破时间的计算公式。该公式考虑了水平井水平段长度、含水饱和度、水相黏度、气相黏度等影响因素,并进行了实例分析。结果表明,利用该公式进行边水气藏水平井边水突破时间预测是可行的,具有一定的指导意义。

In recent years, the development technology for horizontal well has become more and more mature. However, water production, which includes edge water and bottom water, is an important problem affacting gas reservoir development. A lot of studies on bottom water conning are done at home and abroad, but the prediction on water breakthrough time of horizontal well in gas reservoir with edge water is studied less. Therefore, this paper discusses the prediction method for water breakthrough time for the horizontal well. Through mathematical derivation, the formula about water breakthrough time of the horizontal well in the gas reservoir with edge water is obtained. The formula takes into account the factors such as length of horizontal well, original irreducible water saturation, residual gas saturation and the viscosity of water and gas phase. Cases are analyzed. The results show that using this formula, the prediction on water breakthrough time of horizontal well in gas reservoir with edge water is feasible and practical.