Asynchronous co2 injection recovery method in grouped different wells with symmetrical fractures
A symmetrical and fractured technology, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of inability to realize displacement of dead oil areas, limited range of single well stimulation, and easy formation of water channeling, etc. Achieve the effect of increasing the swept volume and oil displacement efficiency, improving the displacement effect and reducing the operation cost
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Embodiment 1
[0047] like Figure 1-5 As shown, according to the grouped different wells with symmetrical fracture layout of the present invention, asynchronous CO injection 2 An embodiment of the oil recovery method, which comprises the following steps in sequence:
[0048] Step 1: Arrange horizontal well I1 and horizontal well II2 in parallel in the formation, and perform symmetrical fracturing on the two horizontal wells to form multiple fracturing fractures perpendicular to the wellbore of the horizontal well and distributed symmetrically; In the area between , the odd-numbered fractures 17 of horizontal well I1 and the even-numbered fractures 28 of horizontal well II2 are connected by natural fractures 6;
[0049] Step 2: Install injection tubing I11 and production tubing I12 in the casing of horizontal well I1, set perforation I13 on injection tubing I11 at the position corresponding to the fracturing fracture, set injection control device I14 at the position of perforation I13, On ...
Embodiment 2
[0067] Asynchronous CO injection in grouped different wells according to symmetrical fracture layout of the present invention 2 Another embodiment of the oil recovery method, its injection and production steps, fracture layout, principle and beneficial effect are the same as the first embodiment, the difference is: the distance between the horizontal well I and the horizontal well II is L=2.3a, and the fracturing fracture The spacing D=0.8a, where a is the half length of the fracture. This embodiment has been proved by a large number of experiments. Compared with the prior art, the CO injection in this embodiment 2 Oil recovery method, the oil recovery increased by 29%.
Embodiment 3
[0069] Asynchronous CO injection in grouped different wells according to symmetrical fracture layout of the present invention 2 Another embodiment of the oil production method, its injection and production steps, fracture layout, principle and beneficial effect are the same as the first embodiment, the difference is: the distance between the horizontal well I and the horizontal well II is L=2.5a, and the fracturing fracture The spacing D=a, where a is the half length of the fracture. This embodiment has been proved by a large number of experiments. Compared with the prior art, the CO injection in this embodiment 2 Oil recovery method, the oil recovery increased by 30%.
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