缝洞型油藏流势调整控水技术研究

RESEARCH ON FLUID POTENTIAL ADJUSTMENT TO CONTROL WATER RISING IN FRAC TURED-VUGGY RESERVOIR

为解决缝洞型油藏因见水和含水上升导致的产量递减的问题。根据缝洞型油藏流动特征,建立流体势表征公式,明确缝洞型油藏流势主要由位能、压能和动能构成,提出通过改变生产压差控制水侵速度和方向,控制油井含水的技术。根据数值模拟结果,明确不同影响因素对流势调整的影响,水油体积比在10~30之间时,排水井与产油井采液比越大,流势调整效果越明显。在流势调整理论和数值模拟的指导下,矿场试验在塔河油田TH12338井组取得较好试验效果,累计增油1.42×10^4 t,井组含水得到有效控制,证明了流势调整是缝洞油藏稳油控水的有效手段。

In order to solve the production decline caused by water breakthrough and water cut rise in fracturedvuggy reservoirs,based on the flow characteristics of fractured-vuggy reservoirs,a corresponding flow potential characterization method was proposed.It is clear that the flow potential of fractured-vuggy carbonate reservoir is mainly composed of potential energy,pressure energy and kinetic energy.By changing the production pressure difference,controlling the speed and direction of water invasion,the fluid potential adjustment can reduce the water rising of the oil well.According to the numerical simulation results,the influence of different influencing factors on the flow potential adjustment is clarified.When the water to oil volume ratio is between 10-30,the larger the production ratio of water well and oil well is,the more obvious the fluid potential adjustment effect is.Under the guidance of flow adjustment theory and numerical simulation.The mine tests are carried out on TH12338 well group in Tahe oil field.The cumulative oil increase is 1.42×104 tons,and the effect of water rising control and oil increase are obtained.It is proved that the flow adjustment is an effective means to stabilize oil and water control in fracture-cavity reservoirs.