Low-concentration carboxymethyl fracturing fluid and preparation method thereof

A carboxymethyl fracturing fluid and low-concentration technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as affecting fracturing and reforming effects, and achieve high conductivity, low concentration, and improved effect. Effect

Active Publication Date: 2013-01-30
西安长庆化工集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006]The above factors have affected the effect of fracturing to a certain extent

Method used

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  • Low-concentration carboxymethyl fracturing fluid and preparation method thereof

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preparation example Construction

[0044] (1) Preparation of solution A: Add water to the container, slowly add carboxymethyl guar gum while stirring with a pump or agitator, and then add surfactant, clay stabilizer and fungicide respectively , Continue to circulate or stir for 30 minutes after adding the temperature-resistant enhancer, so that the liquid can be fully mixed to form solution A.

[0045] (2) During fracturing construction, while pumping solution A, mix solution A and L-11 cross-linking agent with the volume of solution A:JL-11 cross-linking agent=100:0.15~100:.025 Mixed to form fracturing fluid. the

Embodiment 1

[0047] First, the following materials are proportioned according to parts by weight:

[0048] 96.15 parts of water

[0049] Carboxymethyl guar gum 0.25 parts

[0050] Organic zirconium crosslinking agent 0.15 parts

[0051] Hydrocarbon emulsifier 0.30 parts

[0052] Trimethylhydroxypropyl quaternary ammonium salt clay stabilizer 0.20 parts

[0053] Dodecyl dimethyl benzyl ammonium chloride 0.05 part

[0054] Monoethanolamine 0.2 part.

[0055] This is achieved through the following steps:

[0056] (1), the preparation of solution A: in 10m 3 Add water to the container, and slowly add carboxymethyl guar gum while stirring with a pump or a stirrer, and then add hydrocarbon emulsifier, trimethylhydroxypropyl quaternary ammonium salt clay stabilizer, dodecyl Continue to circulate or stir for 30 minutes after the addition of alkyl dimethyl benzyl ammonium chloride and monoethanolamine, so that the liquids can be fully mixed to form solution A.

[0057] (2) During fracturi...

Embodiment 2

[0059] First, the following materials are proportioned according to parts by weight:

[0060] 97.5 parts of water

[0061] Carboxymethyl guar gum 0.275 parts

[0062] Organic zirconium crosslinking agent 0.2 parts

[0063] Alkane sulfonate emulsifier 0.65 parts

[0064] Trimethylhydroxypropyl quaternary ammonium salt clay stabilizer 0.6 parts

[0065] Isothiazolinone 0.275 parts

[0066] 0.5 part of triethanolamine.

[0067] This is achieved through the following steps:

[0068] (1), the preparation of solution A: in 10m 3 Add water to the container, and slowly add carboxymethyl guar gum while stirring with a pump or a stirrer, and then add alkylsulfonate emulsifier and trimethylhydroxypropyl quaternary ammonium clay to stabilize Continue to circulate or stir for 30 minutes after adding the agent, isothiazolone and triethanolamine, so that the liquids can be fully mixed to form solution A.

[0069](2) During fracturing construction, while pumping solution A, mix solu...

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Abstract

The invention discloses a low-concentration carboxymethyl fracturing fluid and a preparation method thereof. At present, a hydraulic fracturing mode is adopted for reconstructing a reservoir bed, but a fracturing fluid system has high gel breaking residue content; when the reservoir bed is reconstructed, the using amount of a gel breaking agent is high, and the average increment reaches about 0.03 percent; after the fracturing fluid is subjected to gel breakage at formation temperature and flow-back fluid reaches ground, a certain cross-linking back condition exists due to reduction in temperature. The fracturing fluid consists of 96.15-98.85 parts of water, 0.25-0.3 part of carboxymethyl guar gum, 0.15-0.25 part of JL-11 cross-linking agent, 0.30-1.0 part of surfactant, 0.20-1.0 part of clay stabilizer, 0.05-0.5 part of bactericide and 0.2-0.8 part of temperature-resistant intensifier. Prepared solution A and L-11 cross-linking agent are mixed according to a volumetric ratio of 100:0.15-100:0.25 to form the fracturing fluid. In the water-based fracturing fluid cross-linked under an alkaline condition, due to low concentration of a thickening agent, low gel breakage residue and high flow guide capacity, the damage caused to the reservoir bed by the fracturing fluid is reduced, and production increasing and reconstruction effects are improved.

Description

technical field [0001] The invention relates to a low-concentration carboxymethyl fracturing fluid used in the gas well fracturing stimulation process and a preparation method thereof, specifically a modified carboxymethyl guar gum as a thickening agent, an organic Zirconium is a cross-linking agent, a water-based fracturing fluid cross-linked under alkaline conditions and a preparation method thereof. technical background [0002] At present, the reservoir depth of the Changqing gas field is higher than 3000m, and the reservoir temperature reaches above 90°C. Most of them use hydraulic fracturing for reservoir reconstruction. In order to ensure the smooth progress of fracturing construction, the water-based fracturing fluid system used The thickener hydroxypropyl guar gum has a concentration of 0.50% to 0.55%, which has good fracture-making and sand-carrying functions, but the system has the following shortcomings: [0003] 1. The fracturing fluid system has a high content...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
Inventor 杜彪陆红军谢璇杨海燕万华李建山赵燕红吕俊华叶智胡鹏飞邓卫珍薛小佳吴江王妍琼李强王伟波
Owner 西安长庆化工集团有限公司
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