大情字井油田A区块重复压裂增产技术

Repeated fracturing stimulation to Block A in Daqingzijing Oilfield

为进一步提高大情字井油田特低渗油藏开发效果,对A区块进行了重复压裂增产技术现场试验。地质上,结合区块油藏特性以及邻井的补压效果,建立了重复压裂选井原则和选层原则,优选出H1井11号层和12号层进行重复压裂试验;工程上,提高加砂强度,通过缝网压裂和树脂砂封堵形成复杂多裂缝,有效增加缝控储量。类比邻井的压裂效果,预测H1井压裂有效期在32个月左右,累增油可达533.2 t。大情字井油田2014-2015年重复压裂效果较好井的初期单井日增油1.0~1.4 t,有效期20-35个月,单井累增油210~736 t,重复压裂实施14井次,成功率78.6%。重复压裂技术在该区块具有较好的适应性,可在其他油藏条件相似的特低渗油藏推广应用。

Field test on repeated fracturing stimulation was carried out to improve the development of the ultra-low-permeability reservoir in Block A of the Daqingzijing Oilfield.Geologically,according to the reservoir features and pressure compensation in adjacent wells,the principles of selecting wells and layers for repeated fracturing stimulation were established,and layers 11 and 12 in Well H1 were selected for test targets.In terms of engineering,measures were taken such as improving proppant concentration,inducing complex and multiple fractures and network with resin sand to increase fracture-controlled reserves.According to the fracturing effect of adjacent wells,it is predicted that the effective post-fracturing period of Well H1 will be about 32 months,and the cumulative oil increase will be 533.2 tons.In the Daqingzijing Oilfield,from 2014 to 2015,the initial oil production was increased by 1.0-1.4 tons/d from the well showing the best repeated fracturing effect,and the effective period was 20 to 35 months,and the cumulative increase of oil was 210 to 736 tons per well.Repeated fracturing stimulation was carried out 14 times,and the success rate was 78.6%.Repeated fracturing stimulation is adaptable for Block A and worthy to be introduced and applied in similar reservoirs with ultra-low permeability.