分段压裂水平井各段压力及供液能力研究

Each section pressure and the fluid supply ability research of staged fracturing horizontal well

低渗透油田水平井水平段长,改造段数多,受储层非均质性、微裂缝发育和注水开发影响,各段压力系统和产量贡献率是值得思考的问题。现场对水平井压力、产量、含水实测表明,水平段压力系统并不一致,过早见水井段压力高,采出程度低。根据油井流入动态方程,类比得出计算产量贡献率公式,定量分析水平井各段在不同地层压力、不同井底流压、不同采液指数比下对产液贡献率的影响。得出各段地层压力相同时,各段产量贡献率与井底流压无关,仅与采液指数比有关;各段地层压力不同时,产量贡献率不仅与井底流压有关,而且与采液指数比有关。

Characteristics of horizontal wells in low permeability oilfield are long horizontal segment numbers of transformation segment, due to restricted by reservoir heterogeneity, micro fracture developed and water-flooding effect, the pressure system of each section and the contribution rate of fluid production is the question worth considering. The pressure, production and water cut of horizontal well measurement shows that, horizontal pressure system is inconsistent, premature water breakthrough well section is of high pressure, low recovery degree. According to the oil well inflow performance equation, analogical get the calculation formula for the contribution rate of production. Quantitative analysis the effect of the contribution rate of production in different formation pressure, different pressure and different fluid production index ratio. We can draw the conclusion that when the formation pressure of the section is the same, the contribution rate of flow production has nothing to do with the bottom hole flowing, only with the liquid production index ratio, when the formation pressure of the section is different, the contribution of flow production is not only with the bottom hole flowing pressure, but also with the fluid productivity index ratio.