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切六E1+2油藏是昆北油田原油油质较差油藏,常温开采后期原油粘度较大,在油田2009年试注水后至2013年部分油井出现含水上升液面下降,先后有12个注采井组46口采油井出现了这个问题。其产生的原因为水油流度比较大,注入流体的波及系数很低,注水开发后一段时间内油井出现含水上升现象;原油中沥青质沉积是造成油藏润湿反转的主要原因之一,切六E1+2油藏储层为特低孔低渗储层。地层低渗的孔喉沥青堵塞作用形成,使油井供液能力减弱。至此油井见水后含水上升液面下降的现象全面形成。结合油田原油性质及油层岩性调配较适应的降粘剂,以综合解堵前置液形式吞吐入地层,在外加非离子表面活性剂的情况下形成了稳定的水包油乳状液,及沥青质分散得到最优配方,实现堵水过油的目的。经现场十井次试用得到了较好效果年增油7600多吨,投入产出比达到1:3.6。
The cut-six E1 + 2 reservoir is a poor oil quality oil reservoir in the northern part of Kunbei Oilfield. Viscosity of the crude oil is larger in the later stage of normal-temperature oil production. After the oilfield flooding from 2009 to 2001, the water cut of some oil wells decreased. There were 12 There are 46 oil wells in the injection well group. This problem has emerged. The reason for this is that the water-oil flow is relatively large, the influ- ence coefficient of injected fluid is very low, and the oil well appears to have a water-rising phenomenon within a certain period of time after water injection is developed. Asphaltene deposition in crude oil is one of the main causes of reservoir wetting reversal , Cutting six E1 +2 reservoir for the ultra-low porosity and permeability reservoir. Formation of low permeability pore throat asphalt blockage effect, so that the ability of liquid wells weakened. So far the wells see the water rise in water cut down the phenomenon of the full formation. Combining with the properties of crude oil in oilfield and the more suitable viscosity reducer in reservoir lithology, a comprehensive oil-blockage pre-treatment solution was swallowed into the formation to form a stable oil-in-water emulsion with addition of non-ionic surfactant and bitumen Dispersion of the optimal formula to achieve the purpose of blocking the oil. After the field ten times the trial has been better results in oil more than 7600 tons, input-output ratio reached 1: 3.6.