低渗透率油层合理的注采井距研究

Study on reasonable injection production well spacing in low permeability reservoir

萨中开发区的萨零油层组为低孔隙度、低渗透率储层,合理的井距是保障这类油田获得较高经济效益的关键,在区块布井的过程中设计了150m和200m两种注采井距,本文从储层渗透率、油藏流体粘度、注采压差三方面展开研究,确定了萨零油层组开发的极限技术井距为135~234m。通过数值模拟确定了极限经济井距,为175~200m。通过水驱控制程度、有效压力梯度和注入采出能力等方面论证了150m和200m两种井距的适应性,结果表明150m井距经济效益较差,相比200米井距适应性较强。

The SaLing reservoir is the low porosity and low permeability reservoir.The reasonable well spacing is the key to ensure the high economic benefit of the oil field,150 mand 200mtwo kinds of injection production well spacing are designed in the process of block layout.In this paper,three aspects of reservoir permeability,reservoir fluid viscosity,injection production pressure difference,the 135 ~ 234 mis determined by the limit of the development of the reservoir.Through numerical simulation,the limit economic well distance,which is 175~200m.The adaptability of 150 mand 200mtwo kinds of well distance is demonstrated by means of water drive control,effective pressure gradient and injection production capacity.The results show that the 150 m well spacing is less than the economic benefit,and the adaptability of the 200 meters well is stronger than that of the well.