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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

Active Publication Date: 2017-05-31
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the low porosity and permeability of tight reservoirs, poor formation connectivity, large seepage resistance, and high heterogeneity, a series of problems may occur when using conventional water injection methods and injection-production well patterns: the injection pressure of water injection wells Usually large, injection is difficult; water channeling is easy to form; and because the seepage resistance of the formation is relatively large, and the flow capacity of the injected water in the formation is poor, resulting in a relatively small swept volume and a relatively limited increase in production of a single well, etc.
Although this invention patent can increase the oil recovery rate, due to the single-well injection and production, for oil and gas reservoirs with a large oil layer area, the swept volume, sweep efficiency and recovery degree will be limited, thereby reducing the oil recovery. Realize the displacement of the dead oil zone in the formation

Method used

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  • Different-well asynchronous water injecting oil extracting method for double fracturing horizontal wells through zipper-type crack distributing
  • Different-well asynchronous water injecting oil extracting method for double fracturing horizontal wells through zipper-type crack distributing
  • Different-well asynchronous water injecting oil extracting method for double fracturing horizontal wells through zipper-type crack distributing

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Effect test

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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Abstract

The invention relates to a different-well asynchronous water injecting oil extracting method for double fracturing horizontal wells through zipper-type crack distributing. The different-well asynchronous water injecting oil extracting method comprises the following steps that in an initial production stage, the two horizontal wells are simultaneously exploited for a period of time through natural energy; oil pipes of the two horizontal wells are taken out, and an injection allocation valve and an injection and extracting separating device are installed on a special position; a well opening oil extracting valve of the horizontal well I is closed, the injection allocation is opened, water is injected into an oil sleeve annular space, and the injected water enters an odd stage crack; the well opening of the horizontal well I is closed to stew the corresponding well, and crude oil and the injected water are imbibed and replaced; a well opening of the horizontal well II is opened to extract the oil; a well opening oil extracting valve of the horizontal well II is closed, the injection allocation valve is opened, and water is injected into the oil sleeve annular space, and the injected water enters an even stage crack; the well opening of the horizontal well II is closed to stew the corresponding well, and the crude oil and the injected water are imbibed and replaced; and the well opening of the horizontal well I is opened to extract the oil. The different-well asynchronous injecting and extracting method can effectively displace residual oil between the wells, between the cracks and in a dead oil area, and the swept volume is improved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas reservoir development, and in particular relates to a zipper-type fracture-distributed double-fracture horizontal well and different well asynchronous water injection oil recovery method. Background technique [0002] In recent years, due to the drastic reduction in the recoverable resources of conventional oil and gas, the exploration and development of unconventional oil and gas has become a new focus, and tight oil is one of them. Tight oil reservoirs are usually developed by depletion at the initial stage of development, but the natural energy of tight oil reservoirs in my country is generally insufficient, and the depletion recovery method alone will cause a rapid drop in reservoir pressure and a rapid decline in production, so energy supplementation is required after a period of development , such as water injection development, etc. [0003] Due to the low porosity and permeability of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20E21B43/26
CPCE21B43/20E21B43/26
Inventor 于海洋马恬程时清杨中林
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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