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Profile control method for low-speed discontinuous injection

A discontinuous, low-speed technology, applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc., can solve the problems of short validity period, small radius, unsatisfactory oil increase and dewatering effect, etc., to reduce shear and transport The effect of increasing the moving speed and improving the gelling effect

Pending Publication Date: 2022-05-13
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of small action radius, short effective period, and unsatisfactory effect of increasing oil and reducing water in conventional profile control and flooding operations, the present invention provides a low-velocity discontinuous injection profile control method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a profile control method of low-speed discontinuous injection.

[0030] 1、 Construction object

[0031] Taking the test well in Bohai oilfield as the injection well, the well is a horizontal well with a water injection of 720m 3 / d. The injection pressure is 10MPa, and the liquid production of the corresponding production well is 720m 3 / d. The average water content is 93%, and the oil production is 50m 3 / d。

[0032] 2、 Construction technology

[0033] It includes the following four slug stages:

[0034] The first slug is a trial injection slug. Inject polymer solution into the water injection wells of the oilfield, and inject 1500mg / L polymer 1200m respectively 3 The maximum allowable injection speed under the tested pressure is 600m 3 / d； 1800mg / L polymer 720m 3 After testing, the maximum injection speed under the allowable maximum pressure of this concentration is 480m 3 / d； The test process is as follows: 720m according to the water injecti...

Embodiment 2

[0041] This embodiment provides a profile control method of low-speed discontinuous injection.

[0042] 1、 Construction object

[0043] Taking the test well in Bohai oilfield as the injection well, the well is a horizontal well with a water injection of 570m 3 / d. The injection pressure is 9.8MPa, and the liquid production of the corresponding production well is 500m 3 / d. The average water content is 92%, and the oil production is 40m 3 / d。

[0044] 2、 Construction technology

[0045] It includes the following four slug stages:

[0046] The first slug is a trial injection slug, which is injected with polymer solution and 1800mg / L polymer for 800m 3 After testing, the maximum injection speed under the allowable maximum pressure of this concentration is 440m 3 / d； The test process is as follows: according to the water injection speed of 570m before profile control 3 / D. conduct test injection. When the injection pressure reaches or even exceeds the maximum injection pressure allo...

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PUM

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Abstract

The invention discloses a profile control method for low-speed discontinuous injection. The profile control method comprises the following slug stages: trying to inject a slug, injecting a polymer solution, carrying out trying to inject at the water injection speed before profile control, and testing the maximum injection speed of the polymer solution; the profile control system is injected into the profile control slugs, the profile control system is divided into a plurality of small slugs to be injected, after the profile control system is injected into each small slug, the polymer solution is injected to protect the slug, and the well is closed for cement waiting; the injection speed of the profile control system is 50%-70% of the maximum injection speed of the polymer solution in the injection testing slug; protecting a slug, and injecting a polymer solution; displacing the slug, and injecting water. Different fluids are injected into an injection well in sequence, a profile control system is divided into a plurality of slugs for low-speed injection, and after injection of each small slug is completed, the well is closed for cement waiting. By means of the method, the injection performance and the gelling effect of the profile control system in the stratum can be improved, the water flooding swept volume can be further enlarged, the water flooding oil washing efficiency is improved, and the oil reservoir recovery efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of profile control of oil field water injection wells, in particular to a profile control method of low-speed discontinuous injection. Background technology [0002] At present, water injection development is one of the main means to improve oil recovery in the process of oilfield development. With the continuous water injection development of the oilfield, the heterogeneity of the reservoir increases, and there are dominant channels, large pores and serious water channeling between production wells and injection wells, which even cause the phenomenon of "overpressure" in production wells and seriously affect oilfield production. The practice shows that profile control of injection well is the main technical measure to improve the water absorption profile of reservoir, improve the effect of water drive development, and realize oil stability and water control in old oilfields. [0003] However, with the extension ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B43/22
CPCE21B33/13E21B43/16
Inventor 赵文森张健苏彦春周文胜薛新生靖波朱玥珺王大威梁守成张世仑
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD