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Preparation method of composite biological weak gel plugging agent

A technology of water shutoff agent and weak gel, which is applied in the field of preparation of composite biological weak gel water shutoff agent, can solve problems such as inability to unblock recovery, unfavorable downhole operation of water shutoff agent, and irreversible misplugging of oil layers, etc., to achieve saving The effect of job time and cost

Inactive Publication Date: 2015-09-16
关良钰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention solves the problems that existing water blocking agents are not conducive to downhole operations, irreversible plugging of oil layers, and incapable of plugging recovery by providing a preparation method of a composite biological weak gel water blocking agent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 25kg of xanthan gum, 2kg of chromium acetate, 11kg of formaldehyde with a concentration of 36%, and 6kg of sodium thiosulfate, and then mix the weighed substances with 10000kg of water at 30°C and stir evenly to make agent A, and then put them into the glue The barrel is sealed and stored in a cool place until use;

[0032] Weigh 10kg of polyacrylamide, 1.2kg of aluminum citrate, 0.8kg of sodium sulfite, 100kg of sodium silicate with a modulus greater than 3 and a content of 30%, and then mix all the weighed substances with 10000kg of water and stir evenly to make B agent. Then put it into a plastic barrel to seal it, and store it in a cool place for later use;

[0033] Weigh Agent A and Agent B according to the mass ratio of 1:1, and then mix all the Agents A and B that have been weighed evenly to obtain the water shutoff agent of the present invention.

Embodiment 2

[0035] Weigh 30kg of xanthan gum, 2.2kg of potassium dichromate, 11.5kg of formaldehyde with a concentration greater than 36%, 5kg of sodium thiosulfate, and then mix the weighed substances with 10000kg of water at 30°C and stir evenly to make A agent , and then put it into a plastic barrel to seal it, and store it in a cool place for later use;

[0036] Weigh 15kg of polyacrylamide, 1kg of aluminum citrate, 1kg of sodium thiosulfate, 128kg of sodium silicate with a modulus greater than 3 and a content of 30%, and then mix all the weighed substances with 10000kg of water and stir evenly to prepare B agent, then put it into the plastic barrel and seal it, and store it in a cool place for later use;

[0037] Weigh agent A and agent B according to the mass ratio of 1:1, and then mix all the agents A and B that have been weighed evenly to complete the preparation of the water blocking agent of the present invention.

Embodiment 3

[0039] Weigh 50kg of xanthan gum, 2.3kg of potassium dichromate, 12kg of formaldehyde with a concentration greater than 36%, and 7kg of sodium sulfite, and then mix the weighed substances with 10000kg of water at 30°C and stir evenly to prepare Agent A. Then put it into a plastic barrel to seal it, and store it in a cool place for later use;

[0040] Weigh 20kg of polyacrylamide, 0.8kg of aluminum citrate, 1.2kg of sodium sulfite, 150kg of sodium silicate with a modulus greater than 3 and a content of 30%, and then mix all the weighed substances with 10,000kg of water and stir evenly to make B agent , and then put it into a plastic barrel to seal it, and store it in a cool place for later use;

[0041] Weigh agent A and agent B according to the mass ratio of 1:1, and then mix all the agents A and B that have been weighed evenly to complete the preparation of the water blocking agent of the present invention.

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PUM

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Abstract

The invention discloses a preparation method of a composite biological weak gel plugging agent. The method utilizes xanthan gum, sodium silicate, aluminum citrate, or trivalent organic Cr<3+> ions to form weak gel to block high permeability water-yielding stratum of oil reservoir. The plugging agent prepared by the method is applicable to plugging of high permeability zone in conventional oil wells, also applies to water injection wells profile and profile control and displacement; the water-yielding stratum does not need to be found, and the plugging agent can plug everywhere it goes, thus saving a lot of work time and costs. The weak gel can be degraded by sodium hypochlorite or hydrogen peroxide; if the wrong place is plugged, the weak gel can be degraded; therefore, the composite biological weak gel plugging agent is a solvable readable excellent plugging agent with high resistance to salinity.

Description

technical field [0001] The invention belongs to the technical field of water shutoff agents for oil exploitation, and in particular relates to a preparation method of a composite biological weak gel water shutoff agent. Background technique [0002] Chemical selective water shutoff of production wells in oil fields is a professional technology, which is often used in the treatment of water injection and water flooding in the later stage of production of oil production wells and the production transformation of water well injection profile control and flooding to increase production. In recent years, chemical water plugging mainly uses series of water blocking agents such as polyacrylamide gel, polyacrylic acid gel, sodium silicate calcium chloride composite gel, TC-1 thixotropic cement plugging agent, high water expansion agent, etc. Better oil increasing effect. However, some problems were also found in the process of field process application, mainly in: [0003] (1) The...

Claims

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Application Information

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IPC IPC(8): C09K8/514
CPCC09K8/514
Inventor 关良钰王素君关建华关良玉
Owner 关良钰
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