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Low-permeability oil field coupling profile controlling and flooding method

A technology of oil field and water profile control agent, which is applied in the direction of chemical instruments and methods, earthwork drilling and production, and drilling compositions, etc., can solve problems such as unfavorable oil reservoirs, achieve effective unification of water injection volume and oil displacement technology, and improve The effect of oil displacement

Active Publication Date: 2016-10-12
SHAANXI YOUBANG PETROLEUM ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the result of doing so is: no matter how these two technologies for improving water injection effect are carried out, the result is unfavorable for reservoir development

Method used

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  • Low-permeability oil field coupling profile controlling and flooding method
  • Low-permeability oil field coupling profile controlling and flooding method
  • Low-permeability oil field coupling profile controlling and flooding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A low-permeability oilfield coupling control and flooding method is characterized in that: the specific steps of the method are as follows:

[0023] Step 1) Add the water plugging and profile control agent into the carrier liquid uniformly, the amount of the water plugging profile control agent added is 0.1-0.3% of the mass percentage of the carrier liquid, and after mixing, stir evenly to form a stable suspending emulsion;

[0024] Step 2) Open the wellhead of the measure well, and inject the suspoemulsion into the downhole through the variable-drive pump truck;

[0025] Step 3) After the injection operation is completed, the well is not shut in, and the water injection operation is continued, and the suspoemulsion reacts in the depth of the reservoir under the impetus of subsequent water injection, so as to achieve the purpose of regulating flooding and increasing injection;

[0026] Step 4) After 60 days of water injection, according to the control and flooding effec...

Embodiment 2

[0029] The specific steps of a low-permeability oilfield coupling control and flooding method are as follows:

[0030] Step 1) Add water plugging and profile control agent into the carrier fluid evenly, the amount of water plugging and profile control agent added is 0.1-0.3% of the mass percentage of the carrier fluid, and stir evenly after mixing to form a stable suspending emulsion; the The water plugging profile control agent is acrylamide acrylic copolymer, and the particle size of the water plugging profile control agent is 80-200 mesh. The carrying liquid is composed of the following raw materials by mass percentage: 0.3% long-chain carboxylate gemini surfactant, 0.1% sulfosalicylic acid, 0.2% sodium alkylphenol polyoxyethylene ether sulfate and 99.4% clear water ; Wherein, the molecular structural formula of described long-chain carboxylate gemini surfactant is as follows:

[0031]

[0032] Wherein, R is C16-18.

[0033] Step 2) Open the wellhead of the measure wel...

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Abstract

The invention discloses a low-permeability oil field coupling profile controlling and flooding method. The method comprises the following steps that 1, a water shutoff and profile control agent is taken to be uniformly added into carrying fluid, the addition quantity of the water shutoff and profile control agent accounts for 0.1%-0.3% of the mass of the carrying fluid, and the water shutoff and profile control agent and the carrying fluid are mixed and then stirred to be uniform to form stable suspended emulsion; 2, a well mouth of a measure well is opened, the suspended emulsion is injected into the well through a profile controlling and flooding pump truck; 3, after the injection work is finished, the well is not closed, water injection work continues to be conducted, the suspended emulsion reacts at the longitudinal deep position of a reservoir stratum under driving of succeeding water injection, and then the profile controlling and flooding and injection increasing purposes are achieved; 4, after water injection is conducted for 60 days, when the profile controlling and flooding effect is not obvious, that is to say, the water injection pressure is not decreased, or the water content of a peripheral corresponding oil well is not decreased, or the oil yield is not increased, the step 1 to the step 3 are repeatedly conducted according to the profile controlling and flooding effect and stopped until the profile controlling and flooding effect of a well group is obvious; 5, construction is finished. According to the method, water shutoff and profile control on water logging cracks are achieved, the water injection volume of the matrix reservoir stratum is increased, and the oil displacement effect of the matrix reservoir stratum is improved.

Description

technical field [0001] The invention relates to the technical field of profile control, pressure reduction and injection and oil displacement used in oil exploitation, and specifically relates to a low-permeability oilfield coupling regulation and displacement method suitable for low-permeability sandstone reservoirs. Background technique [0002] In the development of low-permeability oilfields, waterflooding is the most efficient and economical enhanced oil recovery technology today. In the process of water injection in oilfields, the contradictions between layers, intralayers and planes caused by injected water are gradually revealed in the later stage of water injection, especially for tight reservoirs with developed fractures and micro-fractures. The formation of network water lines, etc., cause the increase of the development cost of low-permeability oilfields and the decline of the recovery factor. To solve these problems, it is generally necessary to use the technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/138E21B43/20C09K8/584
CPCC09K8/584E21B33/138E21B43/20
Inventor 陈柯全李刚
Owner SHAANXI YOUBANG PETROLEUM ENG TECH CO LTD
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