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Delayed crosslinked chromium gel profile control plugging agent

A technology of profile control water blocking agent and delayed crosslinking, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of increasing construction cost, operation difficulty, and many additives, and achieves long gelation time, High practicability and good thermal stability

Inactive Publication Date: 2015-09-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lin Weimin and others published in the 2003 volume 25 supplement (below) "Journal of Jianghan Petroleum Institute" in the deep profile modification experiment of organic chromium cross-linking agent partially hydrolyzed polyacrylamide gel, by adding pH regulator, stabilizer, retarding Additives have made some improvements to the performance of organic chromium gel plugging agents, but too many additives are added, which increases the construction cost and operation difficulty

Method used

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  • Delayed crosslinked chromium gel profile control plugging agent
  • Delayed crosslinked chromium gel profile control plugging agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 0.08g of sodium thiosulfate, 0.15g of thiourea, and 0.5g of anionic polyacrylamide with a molecular weight of 12 million to 100g of NaCl aqueous solution with a salinity of 10,000 mg / L, and stir at room temperature for 2-3 hours until the anionic polyacrylamide is completely After dissolving, add 0.10g of sodium dichromate and stir evenly to obtain the delayed cross-linked gel profile control and water shutoff agent. The profile control and water shutoff agent freezes for 18 hours at 80°C, and the jelly strength is 0.070MPa. Example 2

Embodiment 2

[0016] Add 0.06 g of sodium sulfite, 0.01 g of m-phenylenediamine, 0.10 g of thiourea, and 0.6 g of anionic polyacrylamide with a molecular weight of 8 million to 100 g of NaCl aqueous solution with a salinity of 10,000 mg / L, and stir at room temperature for 2-3 hours until the anionic polyacrylamide After the acrylamide is completely dissolved, add 0.10 g of sodium dichromate and stir evenly to obtain the delayed crosslinking gel profile control and water shutoff agent. The profile control and water shutoff agent system freezes for 23 hours at 80°C, and the jelly strength is 0.064MPa.

Embodiment 3

[0018] Add 0.10g of sodium hyposulfite, 0.02g of m-phenylenediamine, 0.02g of sodium sulfite, and 0.45g of anionic polyacrylamide with a molecular weight of 10 million to 100g of NaCl aqueous solution with a salinity of 10,000 mg / L, and stir at room temperature for 2-3 hours until the polypropylene After the amide is completely dissolved, add 0.08g of sodium dichromate and stir evenly to obtain the delayed cross-linked gel profile control and water shutoff agent. The profile control and water shutoff system freezes for 26 hours at 80°C, and the jelly strength is 0.074MPa.

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Abstract

The invention relates to a delayed crosslinked chromium gel profile control plugging agent, belonging to the technical field of oilfield profile control plugging. The delayed crosslinked chromium gel profile control plugging agent is formed by crosslinking partially hydrolyzed polyacrylamide and Cr<3+> generated by redox reaction. The delayed crosslinked chromium gel profile control plugging agent is composed of the following components in percentage by weight: 0.3-0.8% of partially hydrolyzed polyacrylamide, 0.02-0.20% of sodium dichromate, 0.15-0.50% of additive and the balance of water. Compared with the reported chromium gel, the delayed crosslinked chromium gel has the advantages of long gelling time, high heat stability and high gel strength. Under the optimal formula, the delayed crosslinked chromium gel has high plugging rate, favorable abrasion resistance and high practicality, and satisfies the demands for on-site construction.

Description

technical field [0001] The invention relates to a delayed cross-linked chromium jelly profile control and water shutoff agent, which belongs to the technical field of oilfield profile control and water shutoff. Background technique [0002] With the development of oilfields, the water cut is increasing year by year, and the conflicts between layers, layers and planes are getting bigger and bigger, so it is imperative to adjust the water injection profile. The research on profile control and water shutoff agent is an extremely important link related to the success of profile control and water shutoff. If the profile control water shutoff agent is unreasonably selected, it will not only be unable to effectively seal the water-bearing hyperpermeable formation, but may also damage the formation. For conventional oil reservoirs, gel profile control agents have been produced on a large scale, and polyacrylamide gel profile control agents are widely used. Chromium-crosslinked pol...

Claims

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Application Information

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IPC IPC(8): C09K8/512C09K8/508
CPCC09K8/512C09K8/5045C09K8/5083
Inventor 贾寒周洪涛张立萍
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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