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Fracturing fluid which resists temperature of 200 DEG C

A fracturing fluid and temperature-resistant technology, applied in the field of fracturing fluids, can solve the problems of jelly-carrying performance drop, guar gum viscosity drop, etc. high intensity effect

Inactive Publication Date: 2012-03-07
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The viscosity of the fracturing fluid is closely related to the temperature. The thermal degradation of the polymer chain at high temperature will lead to a decrease in the viscosity of the guar gum and a decrease in the sand-carrying performance of the jelly. At present, the domestic fracturing fluid system cannot adapt to the reservoir pressure above 160°C Technical requirements for fracturing stimulation, high temperature resistant fracturing fluid (above 180°C), large-scale fracturing scale optimization, and fracturing effect evaluation technology have become the "bottleneck" that restricts the realization of the benefits of exploration and development of such oil and gas fields. The fracturing fluid system of ultra-high temperature reservoirs is the basis for fracturing in these blocks

Method used

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  • Fracturing fluid which resists temperature of 200 DEG C
  • Fracturing fluid which resists temperature of 200 DEG C
  • Fracturing fluid which resists temperature of 200 DEG C

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Preparation and Performance Evaluation of Thickener Modified Guar Gum

[0034] 1. Preparation of thickener modified guar gum

[0035] Install a stirrer, condenser, titration device and thermometer in a 500mL four-hole reaction bottle; add 220mL industrial ethanol at room temperature; add 100g of guacamole collagen powder after stirring; then slowly add NaOH solution (the solution Stirring 30g of sodium hydroxide and 55mL of water), that is alkalization; after the alkalization reaction is completed, start to rise to the set temperature of 55°C, slowly add 35mL of chloroacetic acid and 20mL of ethylene oxide dropwise, and at the same time put the flask on In a water bath, the temperature was raised to a predetermined temperature of 75°C and maintained, and the reaction was continued for 4 hours; after the reaction was completed, the flask was cooled to room temperature, and neutralized by adding hydrochloric acid while stirring. When the pH value was 7.0, the ...

Embodiment 2

[0044] Embodiment 2: Preparation of organo-titanium-zirconium composite crosslinking agent

[0045] 1) Put 200 mL of zirconium oxychloride and water mixture into a four-necked reaction flask equipped with a reflux condensing device according to the compounding ratio of 1:10, stir until completely dissolved, add 10 mL of isopropanol, and pass through N 2 , heated up to the reaction temperature of 80 ° C, stirred for 1 hour; stop passing N 2 , add glycerol 15g and polyalkyl carboxylate sodium R 2 COONa 15g, continue to stir the reaction, neutralize the reaction product to a pH value of 3 to 4, and obtain the organic zirconium crosslinking agent;

[0046] 2) Take organic zirconium crosslinking agent and organic titanium crosslinking agent respectively (purchased from Daqing Qixing Petroleum Technology Co., Ltd., specification WD-51B), mix according to the molar ratio of titanium to zirconium of 40~50:1, stir 30 min, the organic titanium zirconium composite crosslinking agent wa...

Embodiment 3

[0048] Embodiment 3: Determination of rheological properties of high temperature fracturing fluid

[0049] First, measure 100mL of tap water, weigh 1.0g of thickener, dissolve the thickener into a beaker, stir until completely dissolved, and let it stand for 5-10min. After the thickener is completely swollen, measure 100mL of base liquid, and add 0.5 Stir fully after g high-temperature stabilizer, then add 0.45g cross-linking accelerator to it, add clay stabilizer 1.0g, drainage aid 0.1g, demulsifier 0.08g to it respectively after fully stirring, fully stir, after dissolving completely Add 0.8g of high-temperature cross-linking agent to it, stir for about 3 minutes, and put it on the machine after the solution can be hung. Fill the fracturing fluid into the HAKE RS6000 instrument, heat it up to 200°C in a sealed chamber, and then keep the temperature constant. -1 Under continuous shearing for 150min, the change of apparent viscosity with time is measured as figure 2 .

[...

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Abstract

The invention relates to a fracturing fluid which resists temperature of 200 DEG C and solves the problem that present fracturing fluid systems can not adapt to the reservoir fracturing reconstruction technology over 160 DEG C. According to the fracturing fluid, self-made modified guar gum is used as a densifier which has good temperature toleration; and a self-made organic Ti-Zr composite cross-linking agent, which has good crosslinking density and strength, is adopted. Based on the above two components, a high-temperature stabilizing agent, a crosslinking promoter and other auxiliary agentsare added for the preparation of the fracturing fluid. With optimal combination of each component, the product still has good shearing resistance at the temperature of 200 DEG C through a test. The invention provides a high-temperature resistant fracturing fluid for the oil field development.

Description

technical field [0001] The invention relates to an oilfield additive used in the process of oilfield exploration and development, in particular to a fracturing fluid used in the implementation of fracturing reconstruction technology. Background technique [0002] In recent years, with the increasing demand for energy in the world and the advancement of exploration technology, the exploration and development of oil and gas resources has continued to develop in depth. The number of deep wells with abnormal high temperature of 170°C is increasing day by day. At present, the existing technology series are mainly aimed at the exploration and development of shallow and medium-deep tight sandstone gas reservoirs (well depth less than 4000m), but there are still gaps in adapting to increasingly complex engineering geological objects (deep wells, ultra-high pressure, ultra-high temperature, ultra-tight). There are few limitations, such as long deep well drilling cycle, deep well dri...

Claims

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Application Information

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IPC IPC(8): C09K8/68C08B37/00
Inventor 王继刚范振忠娄艳敏刘庆旺万家瑰
Owner NORTHEAST GASOLINEEUM UNIV
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