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Sand solidification agent prepared from xanthan gum in fracturing flow-back fluid of oil and gas field as well as preparation method and application of sand solidification agent

A fracturing flowback fluid, oil and gas field technology, applied in application, chemical instruments and methods, other chemical processes, etc., can solve the problems of intractable fracturing flowback fluid, achieve wide applicability and innovation, and solve land desertification , the effect of large promotion and application value

Inactive Publication Date: 2021-06-04
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a sand-fixing agent prepared from xanthan gum from fracturing flowback fluid in oil and gas fields and its preparation method and application, so as to solve the problem of difficult treatment of fracturing and flowback fluid in oil and gas fields, protect the environment, save water resources, and solve land desertification and other issues such as soil improvement,

Method used

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  • Sand solidification agent prepared from xanthan gum in fracturing flow-back fluid of oil and gas field as well as preparation method and application of sand solidification agent
  • Sand solidification agent prepared from xanthan gum in fracturing flow-back fluid of oil and gas field as well as preparation method and application of sand solidification agent

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Take oil and gas field fracturing flowback fluid into a three-necked flask, add 0.5wt% demulsification flocculant, stir for 15 minutes, and filter after standing for 2 hours, in which polyaluminum chloride and polymethacryloyloxyethyl trimethyl chloride The mass ratio of ammonium is 1:2. Then add 2wt% of 30% hydrogen peroxide aqueous solution and ferrous phosphate with 0.4 times the mass of hydrogen peroxide, stir and react for 3 hours to obtain pretreated oil and gas field fracturing flowback fluid. The sand-fixing agent is obtained by adding 3wt% of humic acid and 2wt% of xanthan gum to the pretreated oil and gas field fracturing flowback fluid.

Embodiment 2

[0026] Take oil and gas field fracturing flowback fluid into a three-necked flask, add 1.0wt% demulsification flocculant, stir for 25 minutes, and filter after standing for 3 hours, in which polyaluminum chloride and polymethacryloyloxyethyl trimethyl chloride The mass ratio of ammonium is 1:3. Then add 4wt% 30% hydrogen peroxide aqueous solution and ferrous phosphate 0.8 times the mass of hydrogen peroxide, and stir for 4 hours to obtain pretreated oil and gas field fracturing flowback fluid. The sand-fixing agent is obtained by adding 3wt% of humic acid and 2wt% of xanthan gum to the pretreated oil and gas field fracturing flowback fluid.

Embodiment 3

[0028] Take oil and gas field fracturing flowback fluid into a three-necked flask, add 0.8wt% demulsification flocculant, stir for 20 minutes, and filter after standing for 2.5 hours, in which polyaluminum chloride and polymethacryloyloxyethyl trimethyl chloride The mass ratio of ammonium chloride is 1:3. Then add 3wt% 30% hydrogen peroxide aqueous solution and ferrous phosphate with 0.6 times the mass of hydrogen peroxide, stir and react for 3 hours to obtain pretreated oil and gas field fracturing flowback fluid. The sand-fixing agent is obtained by adding 2.5wt% humic acid and 0.7wt% xanthan gum to the pretreated oil and gas field fracturing flowback fluid.

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Abstract

The invention discloses a sand solidification agent prepared from xanthan gum in fracturing flow-back fluid of oil and gas field as well as a preparation method and application of sand solidification agent. The preparation method comprises the following steps: 1) adding a demulsification flocculant into the oil and gas field fracturing flow-back fluid, mixing and stirring for 15-25 minutes, standing for 2-3 hours, filtering, then adding a peroxidant and a catalyst, and stirring and reacting for 3-4 hours to obtain a pretreated oil and gas field fracturing flow-back fluid; and 2) adding a proper amount of modifier into the oil and gas field fracturing flow-back fluid pretreated in the step 1) to obtain the sand solidification agent prepared from the oil and gas field fracturing flow-back fluid. According to the method, after the oil and gas field fracturing flow-back fluid is pretreated, humic acid and xanthan gum are added, the oil and gas field fracturing flow-back fluid is prepared into the sand solidification agent, and by means of the method, the problem that the oil and gas field fracturing flow-back fluid is difficult to treat can be solved, the environment can be protected, water resources can be saved, and the problems of land desertification, soil improvement and the like can be solved.

Description

technical field [0001] The invention belongs to the field of sand-fixing agent preparation, and relates to a sand-fixing agent prepared from oil and gas field fracturing flowback liquid xanthan gum, a preparation method and application thereof. Background technique [0002] Oil and gas field fracturing flowback fluid usually refers to the "fracturing fluid waste liquid" discharged from the wellbore after the fracturing operation is completed during the oil and gas production process, and its main components are guar gum, preservatives, gel breakers and other various chemical additives , due to the characteristics of high COD value, high stability, high viscosity, and large water content, if it is discharged randomly without treatment, it will cause serious pollution to the ecological environment and waste of water resources. Therefore, how to rationally use and treat oil and gas field pressure Fissure flowback fluid has very important socioeconomic significance. At the same...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C02F9/04C05G3/80C02F103/10C09K105/00
CPCC02F1/001C02F1/5236C02F1/56C02F1/722C02F1/725C02F9/00C02F2103/10C05F7/00C09K17/40C09K2105/00C05G3/80C05F11/02
Inventor 韩玉英薛瑜瑜宋洁赵栋王晨牛育华
Owner SHAANXI UNIV OF SCI & TECH
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