致密砂岩储层支撑剂优选研究--以临兴神府区块为例

Study on proppant optimization in tight sandstone reservoirs:A case study of Shenfu block in Linxing

为了降低水力压裂对致密砂岩储层进行改造的成本,更好地释放临兴神府区块储层产能,首先采用HXDL-2C支撑剂长期导流能力评价系统装置开展了支撑剂导流能力评价实验,主要研究了闭合压力、铺砂浓度、石英砂粒径和不同粒径组合、石英砂和陶粒组合比例对支撑裂缝导流能力的影响,然后结合文中提出的支撑剂优选原则和数值模拟研究来指导临兴神府区块太2段储层在压裂施工时进行的支撑剂优选工作。结果表明,闭合压力的增加会导致支撑剂导流能力减小;闭合压力一定时,导流能力随铺砂浓度增加而增大;不同粒径支撑剂组合,导流能力随小粒径支撑剂比例的增加而减小;石英砂和陶粒支撑剂组合,随陶粒所占比例的增加导流能力增大。在以上研究基础上,优选出石英砂(20/40目)∶陶粒(20/40目)=1∶1的组合比例在铺砂浓度为4 kg/m 2的条件下进行太2段储层压裂施工时,增产效果较好。

In order to reduce the cost of hydraulic fracturing to transform tight sandstone reservoirs and better release the reservoir productivity in Linxing Shenfu block,firstly,the HXDL-2C proppant long-term flow conductivity evaluation system was used to carry out the proppant flow conductivity capacity evaluation experiment,mainly studying the effects of closing pressure,sand laying concentration,quartz sand particle size and different particle size combinations,and the combination ratio of quartz sand and ceramic particle on the proppant fracture flow conductivity capacity.Then combining with the principles of proppant optimization proposed in the article and numerical simulation research,the proppant optimization work during fracturing construction of the Tai-2 reservoir in Linxing Shenfu block was guided.The results show that the increase in closing pressure will lead to a decrease in the flow conductivity capacity of the proppant.When the closing pressure is constant,the flow conductivity capacity increases with the increase of sand concentration.The flow conductivity capacity decreases with the increase of the proportion of small particle size proppants in different combinations of proppants.The combination of quartz sand and ceramic support agent increases the flow conductivity capacity with the increase of the proportion of ceramic particles.On the basis of the above research,a combination ratio of quartz sand(20/40 mesh)and ceramic particles(20/40 mesh)with a ratio of 1∶1 was selected.Under the condition of a sand spreading concentration of 4 kg/m 2,the production increase effect of fracturing construction in the Tai-2 reservoir was better.