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随着油田开发的进一步深入,瓦庄油田大部分油井进入中高含水开发期,油井含水在60%~90%,原油中富含石蜡、沥青质、胶质等天然的乳化剂。生产过程中井筒出现严重的乳化现象,导致抽油杆上行载荷变大,下行载荷变小,加大了抽油杆的工作负荷,抽油杆断脱几率增加,油井检泵周期缩短。采用化学破乳方法开展了井筒原油破乳降黏试验。选取KD-25型破乳剂及超高分子量聚丙乙烯醚型破乳剂进行评价,筛选出两种主剂进行复配试验,复配后起到了协同增效的效果,脱水率达到94%以上。加药浓度选取120μL/L,加药方式采取药剂直接加入井筒,然后加入一定量的清水对黏附在油套管壁上的药剂进行冲洗,药剂到达油井液面后与井液混合。在2口试验井取得明显效果的基础上,对瓦庄区块油井进行破乳降黏,各井最大载荷均有明显下降,抽油杆功率下降幅度在14.6%~30.2%。
With the further development of the oilfield, most of the wells in Wazhuang Oilfield entered the middle and high water cut development period. The well water content is between 60% and 90%. Crude oil is rich in natural emulsifiers such as paraffin, asphaltene and gum. In the process of production, the wellbore appears serious emulsification phenomenon, which leads to larger load on the sucker rod and smaller load on the sucker rod. This increases the working load of the sucker rod, increases the chances of sucker rod breaking off and shortens the cycle of the well pump. The chemical demulsification method was used to carry out demulsification and viscosity reduction test of wellbore crude oil. The KD-25 demulsifier and ultra-high molecular weight poly (vinyl-ether-ether-ether) demulsifier were selected for evaluation. The two main agents were screened for compounding test. After compounding, synergistic effect was achieved, and the dehydration rate reached above 94%. Drug concentration of 120μL / L, dosing method to take drugs directly into the wellbore, and then add a certain amount of water on the stick to the casing wall of the drug flush, the agent reaches the well level after mixing with well fluids. On the basis of the obvious effect of the two pilot wells, the oil well in Wazhuang block was demulsified and viscosity decreased, the maximum load of each well decreased obviously, and the power drop of the sucker rod was 14.6% -30.2%.