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Low-concentration hydroxypropyl guanidine gum fracturing fluid and preparation method thereof

A hydroxypropyl guar gum and fracturing fluid technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problem of inability to meet the application of ultra-low concentration guar gum fracturing fluid, complex preparation process, poor stability, etc. problem, to achieve good sand-carrying performance, wide application prospects, and low cross-linking agent dosage.

Active Publication Date: 2020-05-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The nano-crosslinking agent in the current technology has problems such as complicated preparation process, high cost, and poor stability, which cannot meet the application of ultra-low concentration guar gum fracturing fluid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0056] Preparation of nano silica organoboron crosslinking agent:

[0057] Nano silica organoboron crosslinking agent A

[0058]Step 1) Add 4 mass parts of 30nm nano-silica to 100 mass parts of ethanol solvent, then ultrasonically half an hour to fully disperse the nano-silica, then add silane coupling agent 3-aminopropyltriethoxysilane 4 parts by mass, reflux reaction for 13 hours, and rotary evaporation to remove ethanol to obtain nano-silica whose surface is covalently modified as amino groups;

[0059] Step 2) Disperse the amino-modified silica into 40 parts by mass of methanol solution, then add 15 parts by mass of 2-formylphenylboronic acid, and stir and react at 25°C for 3.5 hours;

[0060] Step 3) Add 4 parts by mass of sodium borohydride to the solution in step 2, and react for 2 hours at 25°C to prepare nano-silica organoboron crosslinking agent A;

[0061] Nano silica organoboron crosslinking agent B

[0062] Step 1) Add 6 mass parts of 30nm nano-silica to 100 ma...

Embodiment 1

[0070] Hydroxypropyl guar gum fracturing fluid, in parts by weight, includes the following components:

[0071] 100 parts of hydroxypropyl guar gum aqueous solution (concentration by weight is 0.15%);

[0072] 0.5 part of drainage aid;

[0073] 0.5 parts of anti-swelling agent;

[0074] 0.1 part of fungicide;

[0075] 0.125 parts of nano-silica organoboron crosslinking agent A;

[0076] In this example, a mixture of sodium carbonate and sodium hydroxide is used as the pH regulator, and other additives are commonly used additives for fracturing fluids of hydroxypropyl guar gum.

[0077] The fracturing fluid preparation method provided in this embodiment comprises the following steps:

[0078] According to water: hydroxypropyl guar gum: KCl is the weight ratio of 100:0.2:2, under stirring condition, add KCl in water, then slowly add hydroxypropyl guar gum, then add pH adjuster (sodium carbonate: hydroxide Sodium=3:1), adjust the pH value to 11, stir for 30min, and obtain an...

Embodiment 2

[0083] Hydroxypropyl guar gum fracturing fluid, in parts by weight, includes the following components:

[0084] 100 parts of hydroxypropyl guar gum aqueous solution (concentration by weight is 0.3%);

[0085] 0.5 part of drainage aid;

[0086] 0.5 parts of anti-swelling agent;

[0087] 0.1 part of fungicide;

[0088] 0.35 parts of nano-silica organoboron crosslinking agent B;

[0089] In this example, a mixture of sodium carbonate and sodium hydroxide is used as the pH regulator, and other additives are commonly used additives for fracturing fluids of hydroxypropyl guar gum.

[0090] The fracturing fluid preparation method provided in this embodiment comprises the following steps:

[0091] According to water: hydroxypropyl guar gum: KCl is the weight ratio of 100:0.2:2, under stirring condition, add KCl in water, then slowly add hydroxypropyl guar gum, then add pH adjuster (sodium carbonate: hydroxide Sodium=3:1), adjust the pH value to 11, stir for 30min, and obtain an a...

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Abstract

The invention discloses a low-concentration hydroxypropyl guanidine gum fracturing fluid and a preparation method thereof. The fracturing fluid comprises the following components in parts by weight: 100 parts of a hydroxypropyl guanidine gum aqueous solution, and 0.1-0.5 part by weight of a nano silicon dioxide organic boron cross-linking agent, wherein the weight concentration of the hydroxypropyl guanidine gum in the hydroxypropyl guanidine gum aqueous solution is 0.15-0.5%, the nano silicon dioxide organic boron cross-linking agent is nano silicon dioxide with the surface modified with an organic phenylboronic acid group, and the organic boric acid group and the nano silicon dioxide are combined in a covalent bond mode through amino. According to the invention, the fracturing fluid system with low hydroxypropyl guanidine gum concentration is formed, effective cross-linking of the fracturing fluid system is achieved under the low hydroxypropyl guanidine gum concentration of 0.15-0.5%, and the fracturing fluid system has good temperature resistance, shearing resistance and filtration performance and can meet fracturing of oil and gas fields at the temperature of 80-170 DEG C.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a low-concentration hydroxypropyl guar gum fracturing fluid and a preparation method. Background technique [0002] The research on the application of nanotechnology in fracturing fluid is becoming more and more popular, but the current research mainly focuses on enhancing the performance of VES fracturing fluid, and there are no related patents for the research on cross-linked gel fracturing fluid system. Lafitte et al. (Lafitte L, Tusin G, Drochon B, et al.Nanomaterials in Fracturing Applications[C].SPE 155533,2012.) synthesized borate nanofunctional compounds by microemulsion polymerization, and investigated its crosslinking nature. The study found that compared with ordinary borate, the nanomaterial has excellent crosslinking performance due to more crosslinking sites, and can obtain a stronger jelly structure in a low concentration of polymer, proving ...

Claims

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Application Information

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IPC IPC(8): C09K8/68
CPCC09K8/685C09K2208/10
Inventor 贾文峰蒋廷学姚奕明陈作刘建坤魏娟明李洪春吴春方徐胜强
Owner CHINA PETROLEUM & CHEM CORP
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