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Carboxymethyl guar gum acid fracturing fluid

A carboxymethyl guar gum and fracturing fluid technology, applied in the field of fracturing fluid, can solve the problems of rock wettability change, additive performance reduction, adsorption, etc., and achieve the effect of low gel-breaking residue and small formation damage

Active Publication Date: 2012-12-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] ②The supporting additives are mainly cationic, which are prone to adsorption in the formation, causing changes in rock wettability and performance reduction of additives;

Method used

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  • Carboxymethyl guar gum acid fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 30m on site 3 Add 27195kg of water into the container, and slowly add 105Kg of carboxymethyl hydroxypropyl guar gum while stirring with a pump or a stirrer, and then add 1350kg of CJ-12 temperature-resistant enhancer, 600kg of surfactant, and 750kg of COP- SH clay stabilizer, continue to circulate or stir for 30 minutes so that the liquid mixes well to form solution A 1 .

[0025] During fracturing construction, pump solution A 1 At the same time, mix the cross-linking agent with solution A 1 With solution A 1 : crosslinking agent = 100 liters: (1.0 to 2.0) liters volume ratio mixed to form a fracturing fluid.

[0026] The above fracturing fluids are recommended to be used in oil wells where the well temperature is lower than 90°C.

Embodiment 2

[0028] 30m on site 3 Add 29520kg of water into the container, and slowly add 105Kg of carboxymethyl hydroxypropyl guar gum while stirring with a pump or a stirrer, and then add 300kg of CJ-12 temperature-resistant enhancer, 15kg of surfactant, 60kg of COP- SH clay stabilizer, continue to circulate or stir for 30 minutes so that the liquid mixes well to form solution A 1 .

[0029] During fracturing construction, pump solution A 1 At the same time, mix the cross-linking agent with solution A 1 With solution A 1 : crosslinking agent = 100 liters: (1.0 to 2.0) liters volume ratio mixed to form a fracturing fluid.

[0030] The above fracturing fluids are recommended to be used in oil wells where the well temperature is lower than 60°C.

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Abstract

The invention relates to carboxymethyl guar gum acid fracturing fluid, which is prepared from the following components of water, carboxymethyl hydroxypropyl guar gum, a CJ-2 heat-resistant reinforcing agent, a surfactant, a COP-SH clay stabilizer, and a JL-12 crosslinking agent, wherein the JL-12 crosslinking agent is prepared by complexing aluminium chloride and C3-C7 straight chain organic ketone; the COP-SH clay stabilizer is (C4-C8) small cationic quaternary ammonium salt; the CJ-2 heat-resistant reinforcing agent is a mixture of sulfuric acid and citric acid or ethylic acid, which has the pH value of 1-3; the surfactant is a non-ionic fluorocarbon surfactant; a thickening agent of a fracturing fluid system can be used under the acid condition, and the content of water insolubles is more than 5 percent lower than that of the conventional hydroxypropyl guar gum; the matched additives are non-cationic additives, and are difficult to adsorb after entering stratum, so that the wettability of stratum rocks cannot be changed and the performance of the additives cannot be reduced; and the gum-breaking residue of the fracturing fluid system is a little and the damage to the stratum islow.

Description

Technical field: [0001] The present invention relates to a kind of fracturing fluid used in oil well fracturing stimulation technology, specifically a kind of fracturing fluid with carboxymethyl hydroxypropyl guar gum as thickening agent and organic high-valent metal as crosslinking agent. Water-based fracturing fluid that cross-links under extreme conditions. Background technique: [0002] At present, most of the fracturing fluids used in oil and gas field fracturing reconstruction use guar gum and its derivatives (such as hydroxypropyl guar gum) as thickeners, and boron organic or inorganic substances as crosslinking agents. Fracturing fluid has good fracture-making and sand-carrying functions, but the system has the following three deficiencies, which affect the fracturing effect to a certain extent: [0003] ①The characteristics of guar gum and its modified products determine that the fracturing fluid system using it as a thickener can only be cross-linked under alkalin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/90
Inventor 王泽霖杜彪谢璇赵文丁里杨海燕张青伟王俊旭万华牛俊峰
Owner PETROCHINA CO LTD
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