High-temperature-resistant ground cross-linked acid liquor and preparation method thereof

A high-temperature-resistant, ground-based technology, applied to chemical instruments and methods, and drilling compositions, can solve the problems of complex preparation process, high cost, and high toxicity of cross-linking agents, and achieve simple process, low toxicity, and low breakage. Effect of Glue Viscosity

Inactive Publication Date: 2014-10-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Generally speaking, the prior art has realized the ground crosslinking of crosslinking agents and thickeners under acidic conditions to a certain extent, but the crosslinking agents used in the prior art generally have high toxicity, complicated preparation process and high cost. Shortcomings

Method used

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  • High-temperature-resistant ground cross-linked acid liquor and preparation method thereof
  • High-temperature-resistant ground cross-linked acid liquor and preparation method thereof

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Embodiment

[0039] This embodiment provides a high-temperature-resistant ground cross-linking acid solution. In terms of mass percentage, the acid solution includes the following components:

[0040] Hydrochloric acid 23wt%, polyacrylamide polymer 0.6wt%, aldehyde crosslinking agent urotropine 0.25wt%, phenolic crosslinking agent resorcinol 0.15wt%, crosslinking accelerator tetramethylethylenediamine 0.01wt%, corrosion inhibitor benzotriazole 1.5wt%, iron ion stabilizer erythorbic acid 1.0wt%, ammonium persulfate 0.05wt%, the balance is water; the acid is calculated as pure substance.

[0041] The high temperature resistant ground crosslinking acid solution of this embodiment is prepared by the following method:

[0042] Use conventional methods to coat ammonium persulfate particles with a film to form capsules;

[0043] Preparation of the base liquid: add water, ammonium persulfate (capsule), corrosion inhibitor and iron ion stabilizer into the reaction vessel, then slowly pour the acid, and slo...

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Abstract

The invention provides high-temperature-resistant ground cross-linked acid liquor. The acid liquor comprises the following components in percentage by mass: 15-28 weight percent of acid, 0.4-1.0 weight percent of polyacrylamide polymer, 0.1-0.5 weight percent of aldehyde cross-linking agent, 0.05-0.25 weight percent of phenol cross-linking agent, 0.05-0.02 weight percent of crosslinking promoter, 0.5-2.0 weight percent of corrosion inhibitor, 0.5-2.0 weight percent of ferric ion stabilizer, 0.01-0.1 weight percent of ammonium persulfate and the balance of water, wherein the acid is calculated based on pure substances. The invention also provides a method for preparing the high-temperature-resistant ground cross-linked acid liquor. Industrial raw materials which are low in toxicity and low in price are taken as cross-linking agents and cross-linking promoter, the toxicity of the cross-linking agents can be reduced, the process for preparing the high-temperature-resistant ground cross-linked acid liquor is simple, further synthesis is not needed, the field operability is high, the cost is effectively reduced, and application of acid fracturing is further widened.

Description

Technical field [0001] The invention relates to a high-temperature-resistant ground cross-linking acid solution and a preparation method thereof, and belongs to the technical field of oil and gas field reconstruction additives. Background technique [0002] In the prior art, acid fracturing and sand fracturing are the main production stimulation measures for oil and gas reservoir reconstruction. Each has its own technical characteristics and technical advantages, but each also has obvious technical defects. [0003] Acid fracturing is widely used in carbonate formations as a conventional and effective oil and gas stimulation measure. The conventional acid fracturing liquid has low viscosity, strong filtration loss, and fast acid rock reaction speed, which makes it difficult to achieve the purpose of communicating fracture (cavity) reservoirs in remote well zones. At present, a series of acid liquid systems suitable for reservoir reconstruction in carbonate formations have been dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
CPCC09K8/74C09K8/725
Inventor 王超欧阳坚朱卓岩王风王源源陈国浩薛俊杰
Owner PETROCHINA CO LTD
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