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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 and other directions, can solve problems such as affecting the fracturing effect, achieve high conductivity, low gel breaking residue, low concentration effect

Active Publication Date: 2012-01-25
西安长庆化工集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new type of hydraulic fracture liquid used for oil wells can be made by modifying certain chemical compounds called cathode rayon or adding other substances like calcium chloride during production. These modifications help make it more resistant against breaking down over time when exposed to harsh environments such as acid rain without losing its ability to effectively transport fluids into pores within rocks that are being create through drilling operations.

Problems solved by technology

This patented technical problem addressed by this patents relates to improving the efficiency of oil wells during production operations through improved methods involving injected fluids that can help prevent damage caused by excessive pressure or heat buildup on equipment such as pipes.

Method used

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  • Low-concentration carboxymethyl fracturing fluid and preparation method thereof
  • Low-concentration carboxymethyl fracturing fluid and preparation method thereof

Examples

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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 stirrer, 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

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Claims

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Application Information

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Owner 西安长庆化工集团有限公司
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