Low-permeability fractured reservoir oil well water-plugging and screening method

A technology for plugging water and fractures in oil wells, applied in chemical instruments and methods, earthwork drilling and production, wellbore/well components, etc., can solve the waste of plugging agent materials, reservoir damage, and oil well plugging in undisclosed low-permeability fractured reservoirs Problems such as the technology of the water shielding method to achieve the effect of reducing reservoir damage

Active Publication Date: 2013-09-25
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, plugging agents often enter low-permeability oil-bearing reservoirs during injection, causing reservoir damage.
On the other hand, due to the large amount of ineffective fluid loss of the plugging agent during the injectio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The invention discloses a water blocking and shielding method for an oil well in a low-permeability fractured oil reservoir, which comprises the following steps:

[0032] a. Take 0.1 part of shielding agent and 100 parts of carrier liquid and mix to form shielding agent suspension;

[0033] b. Inject the shielding agent suspension into the formation at 50°C to form a shield for low-permeability oil-bearing reservoirs and fracture walls;

[0034] c. Take 0.2 parts of main blocking agent and 100 parts of clear water and mix to form main blocking agent solution;

[0035] d. Inject the main plugging agent solution into the formation at 50°C to form plugging of high-permeable water layers and fractures;

[0036] e. Use clean water to replace all the main plugging agent solution in the wellbore into the oil well reservoir;

[0037] f. After shutting down the well, the main plugging agent solution forms a high-viscoelastic gel after reacting for 24 hours at a temperature of ...

Embodiment 2

[0048] The invention discloses a water blocking and shielding method for an oil well in a low-permeability fractured oil reservoir, which comprises the following steps:

[0049] a, take 2 parts of shielding agent and 100 parts of carrier liquid and mix to form shielding agent suspension;

[0050]b. Inject the shielding agent suspension into the formation at 60°C to form a shield for low-permeability oil-bearing reservoirs and fracture walls;

[0051] c. Take 0.2 parts of main blocking agent and 100 parts of clear water and mix to form main blocking agent solution;

[0052] d. Inject the main plugging agent solution into the formation at 60°C to form plugging of high seepage water layers and fractures;

[0053] e. Use clean water to replace all the main plugging agent solution in the wellbore into the oil well reservoir;

[0054] f. After shutting down the well, the main plugging agent solution forms a high-viscoelastic gel after reacting for 24 hours at a temperature of 60°C...

Embodiment approach

[0065] As the best implementation mode of the present invention, it comprises the following steps:

[0066] a. Take 0.2 part of shielding agent and 100 parts of carrier liquid and mix to form shielding agent suspension;

[0067] b. Inject the shielding agent suspension into the formation at 60°C to form a shield for low-permeability oil-bearing reservoirs and fracture walls;

[0068] c. Take 0.5 parts of main blocking agent and 100 parts of clear water and mix to form main blocking agent solution;

[0069] d. Inject the main plugging agent solution into the formation at 60°C to form plugging of high seepage water layers and fractures;

[0070] e. Use clean water to replace all the main plugging agent solution in the wellbore into the oil well reservoir;

[0071] f. After shutting down the well, the main plugging agent solution forms a high-viscoelastic gel after reacting for 24 hours at a temperature of 60°C under the temporary blocking and shielding effect of the shielding ...

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PUM

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Abstract

The invention discloses a low-permeability fractured reservoir oil well water-plugging and screening method and relates to the technical field of oil well water plugging technology for oil exploitation. The method includes the following steps: taking and mixing 0.05-3 parts of screening agent and 100 parts of carrier fluid; injecting the mixture into a stratum under the condition of 0 DEG C-90 DEG C to screen a fractured wall face; taking and mixing 0.1-1 part of main plugging agent and 100 parts of clean water; injecting the main plugging agent into the stratum under the condition of 0 DEG C-90 DEG C to plug a water outgoing layer and a fracture; using the clean water to replace the main plugging agent to enter an oil well reservoir stratum; closing an oil well and waiting for concretion; opening the oil well, pumping and starting production. The low-permeability fractured reservoir oil well water-plugging and screening method solves the technical problem that the plugging agent is easy to cause damages to the reservoir stratum and is wasted in large quantity when existing general water plugging processes are adopted for construction, and opens up a new way for low-permeability fractured water logging oil well water plugging technology.

Description

[0001] technical field [0002] The invention relates to the technical field of petroleum exploitation, in particular to a water shutoff shielding method for low-permeability fractured oil reservoirs, which is mainly used for protecting low-permeability oil-bearing reservoirs during the water shutoff process of oil wells, and reducing the amount of plugging agents used in the injection process. Waste caused by ineffective filtration. Background technique [0003] In the development process of low-permeability oilfields, due to the long-term advanced water injection development and the influence of formation fractures (natural micro-fractures and artificial fracturing fractures), the formation heterogeneity is extremely serious, and the injected water often flows along high-permeability fractures, while This low-efficiency water injection not only affects the degree of crude oil recovery, but also increases the cost of oil recovery due to energy consumption, treatment of ...

Claims

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Application Information

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IPC IPC(8): E21B33/13C09K8/514
Inventor 王玉功任雁鹏李勇王忍峰汪小宇周然王小文唐冬珠徐洋陈迎花樊庆缘王所良王季鹏荆建春杨发
Owner BC P INC CHINA NAT PETROLEUM CORP
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