Temperature control fracturing fluid

A fracturing fluid and temperature control technology, applied in chemical instruments and methods, drilling compositions, etc., to achieve good high temperature resistance, damage reduction, and good shear resistance

Active Publication Date: 2020-06-30
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This temperature-controlled fracturing fluid can withstand high temperatures up to 200°C and has good shear stability. However, it can be seen from its high temperature curve that its initial viscosity is 400mPa, and it does not have the effect of delaying crosslinking.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The preparation of embodiment 1 temperature control cross-linking agent

[0067] Mix zirconium tetrachloride, boric acid, glycerin, lactic acid and triethanolamine in water at a mass ratio of 1:2.5:2.5:2:3 and then heat to react to obtain a temperature-controlled crosslinking agent; the heating temperature is 60°C , the time is 6 hours; the temperature of the reaction is 100° C., and the reaction time is 1 hour.

Embodiment 2

[0068] Embodiment 2 Preparation of temperature-controlled crosslinking agent

[0069] Zirconium acetate, borax, glycerin, lactic acid and triethanolamine are mixed in water at a mass ratio of 1:2:3:3:3.5 and then heated for reaction to obtain a temperature-controlled crosslinking agent; the heating temperature is 75°C, and the time was 7 hours; the temperature of the reaction was 110° C., and the reaction time was 2 hours.

Embodiment 3

[0070] Embodiment 3 Preparation of temperature-controlled crosslinking agent

[0071] Mix zirconium nitrate, boric acid, glycerin, lactic acid and triethanolamine in water at a mass ratio of 1:3:3.5:4:5 and then heat to react to obtain a temperature-controlled crosslinking agent; the heating temperature is 80°C, and the time is was 7 hours; the temperature of the reaction was 120° C., and the reaction time was 2 hours.

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Abstract

The invention provides a temperature control fracturing fluid, which comprises the following components: 0.4-0.8 wt% of a vegetable gum thickening agent; 1-1.4 wt% of a temperature control cross-linking agent; 0.1-1.5 wt% of a cross-linking accelerant; 0.3-0.7 wt% of a cleanup additive; 0.3-0.7 wt% of a clay stabilizing agent; 0.08-0.12 wt% of a sterilizing agent; 0.13-0.17 wt% of a pH regulator;0.3-0.7 wt% of a demulsifying agent, and the balance of water. According to the invention, the temperature control fracturing fluid provided by the invention can still realize the effect of delaying cross-linking under a high-temperature condition; and the viscosity release point of the temperature control fracturing fluid can be adjusted between 40 DEG C and 120 DEG C by controlling the adding amount of the cross-linking accelerant, so that the problems that in ultra-deep and ultra-high temperature well fracturing large-displacement construction, the tubular column temperature control fracturing fluid is high in viscosity and friction resistance are solved.

Description

technical field [0001] The invention relates to the field of oilfield chemistry, in particular to a temperature-controlled fracturing fluid. Background technique [0002] For ultra-deep, ultra-high-temperature, ultra-high-pressure oil and gas reservoir transformation, in order to meet the high-temperature reservoir and large-displacement construction, the temperature-controlled fracturing fluid is required to be high-temperature resistant and low-friction. At present, the temperature-controlled fracturing fluid of conventional HPG (guar gum) plant gums has a high temperature resistance of 180°C, and the higher the requirement for high temperature resistance, the stronger the alkalinity of the temperature-controlled fracturing fluid, and its pH value can reach 14. Great damage to high clay reservoirs, which is not conducive to the protection of reservoirs. Although conventional delayed cross-linking agents can show good delayed cross-linking performance at surface temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/685
Inventor 范明福肖兵郭粉娟刘长延董永刚王延平
Owner 中石化石油工程技术服务有限公司
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