Guanidine gum fracturing fluid gel capable of reducing pH dependence, guanidine gum fracturing fluid system and preparation method and application thereof

A fracturing fluid and gel technology, applied in chemical instruments and methods, drilling compositions, titanium organic compounds, etc., can solve the problems of extensive use of fracturing construction, cumbersome synthesis methods, human injury, etc. The size of the joint agent, the effect of simple method and easy operation

Active Publication Date: 2022-01-21
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Compared with ordinary organoboron crosslinking agents, the performance of the above-mentioned crosslinking agent synthesized by surface grafting is greatly improved, but the synthesis method is more cumbersome, and the monomers during synthesis may cause harm to the human body, which is not conducive to fracturing heavy use of construction

Method used

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  • Guanidine gum fracturing fluid gel capable of reducing pH dependence, guanidine gum fracturing fluid system and preparation method and application thereof
  • Guanidine gum fracturing fluid gel capable of reducing pH dependence, guanidine gum fracturing fluid system and preparation method and application thereof
  • Guanidine gum fracturing fluid gel capable of reducing pH dependence, guanidine gum fracturing fluid system and preparation method and application thereof

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Effect test

Embodiment 1

[0061] A preparation method of guar gum fracturing fluid gel system, the steps are as follows:

[0062] (1) Dissolve isopropanol and triethanolamine in ethylene glycol according to the mass ratio of 1:2 and mix evenly. The mass ratio of ethylene glycol to boric acid is 20:1. According to 1:2 (isopropanol: boric acid ) to a mass ratio of boric acid, adjust the temperature to 65°C and continue to stir until the boric acid is completely dissolved to form a mixed solution. According to the mass ratio of 1:20 (tetraisopropyl titanate: mixed solution), tetraisopropyl titanate was added to the above mixed solution, the temperature was raised to 75°C, and a stable organic Boron-titanium crosslinker solution.

[0063] (2) prepare concentration 0.3% hydroxypropyl guar gum solution and make it fully swell, add 0.1% average particle diameter and be the nano-silica (Shanghai Naiou Nano Technology Co., Ltd., 99.9%) containing active hydroxyl of 20nm and mix Evenly, the nanoparticles are c...

Embodiment 2

[0065] A preparation method of guar gum fracturing fluid gel system, the steps are as follows:

[0066] Propanol and triethanolamine are dissolved in ethylene glycol according to the ratio of 1:2 and mixed evenly. The mass ratio of ethylene glycol and borax is 15:1. Add borax according to the ratio of 1:2 (propanol: borax), adjust The temperature is 65°C and the stirring is continued until the borax is completely dissolved to form a mixed solution. Add butyl titanate to the above mixed solution at a mass ratio of 1:30 (butyl titanate: mixed solution), raise the temperature to 75°C, and continue the reaction for 3 hours to obtain a stable organic boron titanium crosslinking agent solution .

[0067] Prepare concentration 0.25% hydroxypropyl guar gum solution and make it fully swell, add 0.12% average particle diameter and be the nano-titanium dioxide (Aladdin reagent (Shanghai) Co., Ltd., anatase, hydrophilic lipophilic type, 99.8%) and mix uniformly, so that the nanoparticle...

Embodiment 3

[0069] A preparation method of guar gum fracturing fluid gel system, the steps are as follows:

[0070] Dissolve glycerol and triethanolamine in ethylene glycol at a ratio of 1:3 and mix evenly. The mass ratio of ethylene glycol to boric acid is 18:1. Add boric acid at a ratio of 1:2 (glycerol: boric acid) , adjust the temperature to 65°C and keep stirring until the boric acid is completely dissolved to form a mixed solution. Add tetraisopropyl titanate to the above mixed solution at a ratio of 1:30 (tetraisopropyl titanate: mixed solution), raise the temperature to 75°C, and continue the reaction for 3 hours to obtain a stable organic boron titanium Crosslinker solution.

[0071] Prepare concentration 0.15% hydroxypropyl guar gum solution and make it fully swell, add 0.08% diameter and be 50nm, the nano-cellulose (Jiangsu North Century Cellulose Material Co., Ltd.) that length is 400nm and mix homogeneously, make nanoparticle be dispersed in completely In the guar gum solut...

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Abstract

The invention relates to guanidine gum fracturing fluid gel capable of reducing pH dependence, a guanidine gum fracturing fluid system and a preparation method and application thereof. The fracturing fluid gel is prepared from the following components in percentage by weight: 0.01 to 0.2 percent of nano material, 0.1 to 0.5 percent of guanidine gum, 0.1 to 0.5 percent of organic boron-titanium cross-linking agent and the balance of water. The fracturing fluid gel is more stable in network structure and good in temperature resistance and shear resistance. The invention further provides the preparation method and application of the fracturing fluid gel. According to the guanidine gum fracturing fluid system, the dependence on pH is reduced, and the damage degree of the high pH value to a reservoir is reduced.

Description

technical field [0001] The invention relates to a guar gum fracturing fluid gel capable of reducing pH dependence, a guar gum fracturing fluid system, a preparation method and application thereof, and belongs to the technical field of oil field chemical additives in oil and gas field development. Background technique [0002] The development of low-permeability reservoirs is a difficult problem facing the development of oil and gas fields in my country. Fracturing technology can effectively improve the permeability of reservoirs, increase the seepage channels of oil and gas, and thus improve the recovery factor. The most basic components of hydraulic fracturing fluid include thickener, crosslinking agent and gel breaker. According to the fracturing requirements of different reservoirs, some targeted additives, such as temperature stabilizers and fungicides, need to be added. Guar gum and its derivatives are widely used due to their good water solubility and low cost, but in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/90C07F7/28
CPCC09K8/685C09K8/887C09K8/905C07F7/28C09K2208/10C09K2208/26
Inventor 王彦玲张传保梁雷刘斌汤龙皓巩锦程许宁
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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