Different-well asynchronous water injecting oil extracting method for double fracturing horizontal wells through zipper-type crack distributing
A horizontal well, zipper-type technology, applied in wellbore/well components, production fluids, earth-moving drilling, etc., can solve the problems of limited production increase in a single well, easy formation of water channeling, and reduced oil production, so as to improve displacement. effect, reduce operating costs, and increase the effect of sweeping volume
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Embodiment 1
[0045] Such as Figure 1-7 As shown, according to an embodiment of the method for asynchronous water injection and oil recovery of double fracturing horizontal wells and different wells according to the present invention, it comprises the following steps in sequence:
[0046] Step 1: Arranging the horizontal well I1 and the horizontal well II2 in parallel in the formation, and performing zipper fracturing on the two horizontal wells to form multiple fracturing fractures perpendicular to the wellbore of the horizontal well and distributed in a zipper pattern;
[0047] Step 2: At the initial stage of production, the horizontal well I1 and the horizontal well II2 are simultaneously exploited for a period of time by using natural energy, until the bottom hole pressure of the two horizontal wells both drops to the bubble point pressure;
[0048] Step 3: Take out the tubing 11 of the horizontal well I1, install a dispensing valve 14 at the position of each odd-numbered fracture 12, ...
Embodiment 2
[0066]According to another embodiment of the method for asynchronous water injection and oil recovery of double fracturing horizontal wells in different wells with zipper-type seam distribution of the present invention, its injection-production steps, method of seam distribution, principles and beneficial effects are all the same as those in Embodiment 1, the difference is : The distance between horizontal well I and horizontal well II is L=1.9a, and the distance between fractured fractures is D=1.5a, where a is the half-length of fractured fractures. A large number of tests in this embodiment prove that, compared with the prior art, the oil recovery method of this embodiment increases by 23%.
Embodiment 3
[0068] According to another embodiment of the method for asynchronous water injection and oil recovery of double fracturing horizontal wells in different wells with zipper-type seam distribution of the present invention, its injection-production steps, method of seam distribution, principles and beneficial effects are all the same as those in Embodiment 1, the difference is : The distance between the horizontal well I and the horizontal well II is L=1.2a, and the distance between the fractures is D=0.8a, where a is the half length of the fracture. A large number of tests in this embodiment prove that, compared with the prior art, the oil recovery method of this embodiment increases by 25%.
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