Oil displacement fracturing technology of shallow tight oil reservoirs and its application in eastern Yanchang Oilfield
Slickwater staged fracturing has achieved initial results in the development of shallow tight oil reservoir in Nanniwan Oil Production Plant,but the production declines rapidly,and one of the reasons is that the reservoir energy is insufficient.In view of the demand for energy increase in shallow tight reservoirs,large displacement volume,large fluid volume and low sand ratio oil-displacing slickwater fracturing fluid is used to be retained in the formation to supplement formation energy.Oil and water displacement is carried out through well soaking,forming the oil displacement fracturing technology.The total number of perforations is controlled according to the construction displacement.Fracturing is carried out at a minimum displacement rate of 0.3m3/min per hole.Well soaking is carried out after fracturing.Through the optimization and simulation of fracturing,the design can form a large reservoir reconstruction volume to achieve the volume fracturing effect.The field test in Well Ping 2 of Ping 132 well area shows that the field implementation is simple,the whole construction pump pressure is low and stable,and the displacement is stable,achieving a good effect of production increase.
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