Fractured reservoir horizontal well injection-production asynchronous exploitation method

A mining method and technology for horizontal wells, which are applied in the fields of production of fluids, earth-moving drilling, wellbore/well components, etc., can solve the problems of low final recovery rate, low formation energy, rapid production decline, etc. Water content, the effect of replenishing formation energy

Inactive Publication Date: 2017-02-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the problems of lower formation energy, rapid production decline, and low ultimate recovery in existing oil production

Method used

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  • Fractured reservoir horizontal well injection-production asynchronous exploitation method
  • Fractured reservoir horizontal well injection-production asynchronous exploitation method
  • Fractured reservoir horizontal well injection-production asynchronous exploitation method

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Experimental program
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Embodiment 1

[0033] In order to overcome the problems of rapid formation energy reduction, rapid production decline, and low final recovery in the existing method, the present invention provides figure 1 , figure 2 The asynchronous production method for horizontal well injection and production in fractured oil reservoirs is shown. The present invention utilizes the role of injected water in the penetration and replacement of the crude oil in the reservoir rock with the fracture as the medium. The stimulation mechanism is mainly through periodic Water injection huffs and puffs, to give full play to the capillary reverse imbibition of the matrix, replace the crude oil in the matrix rock block into the fractures for exploitation, so as to realize the effective development of fractured low-permeability reservoirs that are difficult to produce by conventional water injection development.

[0034] An asynchronous injection-production method for horizontal wells in fractured reservoirs, the specific ...

Embodiment 2

[0048] Based on the foregoing embodiment, in this embodiment, each water injection period is 60 days, and the oil production period is 180 days.

[0049] In the production stage of horizontal production wells, the production cycle is about 180 days, and the output of a single well is about 30 cubic meters. At the end of the production period, the formation pressure is slightly higher than the saturation pressure, and the cycle cumulative fluid production is about 5500 cubic meters. The cycle injection and production are basically balanced.

[0050] In the step 2), in the water injection process, the injected water 6 enters the oil-bearing pores of the matrix rock block around the horizontal well 2 along the open natural fractures and horizontal well 2 fractures under the dual effects of water injection pressure and capillary pressure .

[0051] During the water injection process, the formation pressure is gradually restored, the pressure is maintained at 90-100% of the original forma...

Embodiment 3

[0056] Based on the foregoing embodiment, in this embodiment, the horizontal oil production well in step 2) is shut in, and the water injection well 1 is injected with 90 cubic meters of water. During the water injection process, the formation pressure gradually recovered, the pressure remained at 95% of the original formation pressure, and the oil and water in the horizontal well 2 area redistributed. Repeat steps 2) and 3) of the water injection and oil extraction process, and the entire cycle is selected as 9 cycles.

[0057] In the first cycle of asynchronous injection-production, the daily production and cumulative oil production of a single well is the highest, and the water cut is the lowest. With the increase of water cut, the decrease of remaining oil, the gradual decline in production, and the gradual increase of water cut, the best asynchronous injection-production cycle is 9 cycle. During the asynchronous injection-production process, the opening and shut-in processe...

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Abstract

The invention provides a fractured reservoir horizontal well injection-production asynchronous exploitation method. The method comprises the steps that 1, area selecting and well selecting are conducted, specifically, a reservoir stratum with developed natural micro-fractures is selected, fractured water breakthrough in the multi-section fractured horizontal well production process is achieved through waterflooding extraction, and when the average increasing amount of the water content every day is larger than or equal to 1.5%, remaining oil within a horizontal well controlled area is used for an injection-production asynchronous oil extraction horizontal well; 2, the oil extraction horizontal well is closed, 80-100 cubic meters of water is injected into a water injection well, and the oil extraction horizontal well is closed; 3, the water injection well is closed, then, the oil extraction horizontal well is opened for oil extraction, the injected water entering matrix rock blocks is preserved, and the equal amount of crude oil replacing the injected water enters a fracture system, flows into a shaft and is extracted; and 4, the next round of water injection is started, the step 2 and the step 3 are repeated, and injection-exploitation asynchronous operation is conducted for 8-10 periods. According to the fractured reservoir horizontal well injection-exploitation asynchronous exploitation method, on the basis of the seam-net type fractures, the contact area of the injected water and the fractures is enlarged, the oil-water replacement amount is further increased, the reservoir overall imbibitions yield-increasing effect is improved, and accordingly the purposes of decreasing the water content of the fractured water breakthrough horizontal well, increasing the liquid amount and the oil amount, and supplementing the stratum energy are achieved.

Description

Technical field [0001] The invention relates to the field of oil field development, in particular to an asynchronous production method for horizontal well injection and production in fractured oil reservoirs. Background technique [0002] With the increasingly prominent contradiction between oil supply and demand in the world and the gradual lack of high-quality oil resources, the development of ultra-low permeability tight oil resources has become the main object of the development of my country’s petroleum industry. The production practices of tight reservoirs at home and abroad have shown that fracturing horizontal wells is the development An effective development method for this type of reservoir. However, most of the low-permeability tight oil reservoirs have natural fractures and micro-fractures. After multi-stage fracturing of horizontal wells, artificial fracturing is complicated. During the water injection development process, it is easier to form fractures and natural fr...

Claims

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Application Information

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IPC IPC(8): E21B43/20
CPCE21B43/20
Inventor 屈雪峰王选茹雷启鸿何右安王进宋鹏高武彬王楠
Owner PETROCHINA CO LTD
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