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Selective water plugging method for high-water-content oil well of bottom water reservoir

A bottom water reservoir, selective technology, applied in chemical instruments and methods, earthwork drilling and production, wellbore/well components, etc., can solve the problems of difficult water shutoff and poor water shutoff effect in edge and bottom water reservoirs, and achieve Effects of increasing stability and strength, increasing oil resistance, and strengthening the effect of pressing the cone

Active Publication Date: 2021-10-01
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a selective water shutoff method for high water content oil wells in bottom water reservoirs in view of the current problem of difficult water shutoff and poor water shutoff effect in edge and bottom water reservoirs

Method used

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  • Selective water plugging method for high-water-content oil well of bottom water reservoir
  • Selective water plugging method for high-water-content oil well of bottom water reservoir
  • Selective water plugging method for high-water-content oil well of bottom water reservoir

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Effect test

Embodiment 1

[0035] The selective water shutoff method of the high water-cut oil well in the bottom water reservoir of the present invention is specifically as follows:

[0036] like figure 1 As shown, with long-term water injection production, the oil well enters the stage of high water cut, and the bottom water invades seriously, resulting in water cones and water flooding in the lower high permeability layer.

[0037] At this time, if figure 2 As shown, nitrogen is injected downhole at high speed and high pressure through tubing. At this time, nitrogen preferentially enters the hyperpermeable layer to increase the pressure of the hyperpermeable layer. The intrusion of nitrogen drives the intrusive water to the lower part to achieve the purpose of pressing down the water cone, which can be used for subsequent plugging. The entry of water agent creates conditions. Since nitrogen is injected into the formation at high speed and high pressure, some nitrogen enters the low-permeability la...

Embodiment 2

[0054] The water shutoff method of the present invention is applied to a specific high water cut oil well in a certain bottom water reservoir. The specific method is as follows:

[0055] S1. Inject nitrogen gas into the well at high speed and high pressure, so that nitrogen gas enters the high-permeability water-producing layer. The entry of nitrogen gas drives the intrusive water to the lower part, achieving the purpose of pressing down the water cone and providing conditions for subsequent operations. According to the research of the gel foam system, the optimal amount of nitrogen gas is twice the volume of the mixed solution injected in step S2, and the volume calculation formula of the mixed solution is: Q=πR 2 hφ, where R=10m, h=2m, φ=0.3. The amount of nitrogen injected uses the state equation PV=nRT to convert the ground volume, and the gas injection speed is controlled at 600-900m 3 / h, the gas injection pressure is higher than the formation pressure.

[0056] S2. I...

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Abstract

The invention discloses a selective water plugging method for a high-water-content oil well of a bottom water reservoir. The selective water plugging method comprises the following steps of injecting a nitrogen pressure cone into a shaft, injecting a mixed solution of a foaming agent, a polymer solution, a foam stabilizer and a cross-linking agent, and forming gel foam in a stratum. then removing foam in a high-permeability layer through flowback, so that the purposes of temporary plugging of low permeability and enabling a subsequent water plugging agent to directionally enter the high-permeability layer are achieved; then injecting the water plugging agent, and enabling the water plugging agent to build an artificial partition plate at the proper position in a water producing layer, so that bottom water is prevented from moving upwards, and bottom water coning is restrained; and finally, enabling the water plugging agent to be displaced out of a certain position of a near wellbore zone through over-displacement of a polymer solution, so that a certain liquid production capacity after plugging is ensured, the injection pressure of the water injection well is prevented from being too high, and the validity period of the water plugging agent is prolonged. Under the combined action of the steps, directional water plugging is achieved, and the problems that water breakthrough of the oil well is too early, and the yield is sharply reduced after water breakthrough are solved.

Description

technical field [0001] The invention relates to the field of oil recovery engineering in bottom water reservoirs, in particular to a selective water shutoff method for high water content oil wells in bottom water reservoirs. Background technique [0002] After the oil and gas with water bodies migrate and accumulate, due to gravity differentiation, the oil in the reservoir is always above the water, and according to the oil-water contact relationship, such reservoirs can be divided into edge water reservoirs and bottom water reservoirs. Compared with other types of reservoirs, the oil-bearing area of ​​the edge-bottom water reservoir will be in direct contact with the water body. In the middle and early stages of oilfield development, the edge and bottom water will provide certain energy for the development of the oil reservoir, making the oil field stable; The water tongue or cone advance makes the oil well start to see water, the water-free oil production period is shorte...

Claims

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Application Information

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IPC IPC(8): E21B33/13C09K8/512C09K8/518C09K8/504C09K8/84C09K8/88C09K8/94
CPCE21B33/13C09K8/512C09K8/518C09K8/5045C09K8/845C09K8/887C09K8/94C09K2208/10
Inventor 金发扬李启航王冕宋书渝杨振明钱德升廖伟
Owner SOUTHWEST PETROLEUM UNIV
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