Fracture technology for injection well for preventing closing of fracture opening and increasing injection
A technology for injection wells and fracture openings, which is applied in wellbore/well components, production fluids, earth-moving drilling, etc. It can solve the problems of fracturing failure, water well fracturing validity period, and fracture closure, etc. Validity period, effect of reducing load
Inactive Publication Date: 2002-12-25
DAQING OILFIELD CO LTD
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Problems solved by technology
However, the pressure in the fracture of the injection well in the oil field is close to the closure pressure of the formation. When the injection pressure fluctuates slightly, the fracture will open, and the proppant 2 in the fracture will move to the depth of the formation 3 ( figure 1 As shown), there is no proppant in the fracture near the wellbore 1, resulting in a short effective period of water well fracturing; especially in the polymer injection well, the proppant is easily brought into the formation due to the high viscosity of the polymer solution, strong sand-carrying ability and high injection pressure In the deep part, the fractures near the wellbore 1 were closed, and the fracturing failed. The expected effect of the fracturing technology was not achieved, and the validity period was about 1.5 months
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[0011] The present invention will be further described below:
[0012] The closed fracturing injection well injection well anti-fracture opening process is to use the characteristics of resin sand to connect the proppant 4 near the wellbore 1 in the fracturing fracture into one. Specifically, add 1.0-1.8m 3 The resin sand is then filled to the fracture opening evenly through the replacement volume equal to the volume of the tubing, preventing the fracturing proppant 2 from migrating to the depth of the formation 3 with the injection fluid during the production process of the injection well. The reason is that affected by the temperature, the resin layer softens first, and the solidification substance in the resin sand undergoes a polymerization reaction to solidify, so that the particles are consolidated together, and the point-to-point contact between the particles becomes a small-area contact. , reducing the load on the gravel, increasing the anti-fragmentation ability of th...
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A fracturing injection technology for preventing the fracture opening injection well from being closed is characterized by that characteristics of resin sand are used to link the propping agent in the fracture near the shaft into a whole body, so preventing the fracture propping agent from moving toward deep stratum with the injected liquid and a elongating the effective period of fracture.
Description
Technical field: [0001] The invention relates to a technology in the field of oilfield fracturing, which belongs to the technology of injection well anti-fracture closing fracturing and increasing injection. Background technique: [0002] At present, after the oil and water wells in the oilfield are drilled, the casing is drilled to perforate, and then the fracturing is carried out. The performance of the liquid to transmit pressure is mainly used, and the high-viscosity liquid is driven into the high-viscosity liquid with a displacement greater than the absorption capacity of the formation by using a high-pressure pump set on the ground. In the well, a high pressure is generated at the bottom of the well. This pressure exceeds the in-situ stress of the oil layer and the tensile strength of the rock, forming fractures in the formation. Continue to inject the sand-carrying fluid with proppant into the fractures. The fractures are extended and supported at the same time. Suppo...
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IPC IPC(8): E21B43/267
Inventor 王德民王研李德胜李庆龙李金瑞张再祥
Owner DAQING OILFIELD CO LTD