Method for preventing proppants in water-base fracturing fluid from settling in transfer process

A water-based fracturing and proppant technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as proppant settlement that is not completely solved

Inactive Publication Date: 2016-06-15
CHENGDU LEARN PRACTICES TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But none of them completely solved the problem of proppant settlement

Method used

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  • Method for preventing proppants in water-base fracturing fluid from settling in transfer process
  • Method for preventing proppants in water-base fracturing fluid from settling in transfer process
  • Method for preventing proppants in water-base fracturing fluid from settling in transfer process

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preparation example Construction

[0046] The preparation method of this organic zirconium crosslinking agent comprises the steps:

[0047] 1) Warm up deionized water to 50-90°C, add zirconium trichloride, sodium chloride, and ammonium chloride in sequence, and stir at a speed of 20-40 rpm to obtain transparent liquid A;

[0048] 2) Add ethylene glycol into the transparent liquid A and stir at a speed of 20-40 rpm to obtain the transparent liquid B;

[0049] 3) Add lactic acid to the transparent liquid B to react, and drop lye to adjust the pH value to 4-8;

[0050] 4) React at constant temperature for 45min-480min to obtain a colorless and transparent organic zirconium crosslinking agent.

Embodiment 1

[0053] formula:

[0054] Deionized water: 40 parts;

[0055] 4 parts of zirconium trichloride;

[0056] 13 parts of ethylene glycol;

[0057] 6 parts of lactic acid;

[0058] Sodium chloride 0.1 part;

[0059] 0.01 parts of ammonium chloride.

[0060] The preparation steps are: heat 40 parts of deionized water to 50°C, add 4 parts of zirconium trichloride, 0.1 part of sodium chloride, and 0.01 part of ammonium chloride in sequence, stir at a speed of 20-40 rpm, and wait for the trichloride to After the zirconium is completely dissolved, add 13 parts of ethylene glycol and stir at a speed of 20-40 rpm. After fully dissolving, continue to add 6 parts of lactic acid, and then drop in 20% sodium hydroxide lye to adjust the pH value to 6. React at constant temperature for 480 minutes to obtain a colorless and transparent organic zirconium crosslinking agent.

[0061] Performance evaluation: the effect of using the above organic zirconium crosslinking agent in water-based fractu...

Embodiment 2

[0063] formula:

[0064] Deionized water: 70 parts;

[0065] 5 parts of zirconium trichloride;

[0066] 12 parts of ethylene glycol;

[0067] 6 parts of lactic acid;

[0068] Sodium chloride 0.1 part;

[0069] 0.01 parts of ammonium chloride.

[0070] The preparation steps are: heat 70 parts of deionized water to 50°C, add 5 parts of zirconium trichloride, 0.1 part of sodium chloride, and 0.01 part of ammonium chloride in sequence, stir at a speed of 20-40 rpm, and wait for the trichloride to After the zirconium is completely dissolved, add 12 parts of ethylene glycol and stir at a speed of 20-40 rpm. After fully dissolving, continue to add 6 parts of lactic acid, and then drop in 20% sodium hydroxide lye to adjust the pH value to 4. React at a constant temperature for 480 minutes to obtain a colorless and transparent organic zirconium crosslinking agent.

[0071] Performance evaluation: the effect of using the above organic zirconium crosslinking agent in water-based fr...

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Abstract

The invention discloses a method for preventing proppants in water-base fracturing fluid from settling in a transfer process. By enhancing the strength of a spatial network structure, the spatial network structure cannot be destroyed in a proppant transfer process, and the proppants always maintain a suspension state instead of settling in the fluid. Technical measures for enhancing the strength of the spatial network structure are as follows: crosslinking agents are used for being crosslinked with polyacrylamide polymers, wherein the crosslinking agents comprise a crosslinking agent A and a crosslinking agent B, the crosslinking agent A is an organic zirconium crosslinking agent, and the crosslinking agent B is a conventional crosslinking agent; the crosslinking agent B and the polyacrylamide polymers are subjected to physical crosslinking, and surfactant hydrophobic groups in the crosslinking agent B and hydrophobic groups in the polymers are subjected to a hydrophobic effect, so that the strength of the system spatial network structure is enhanced; the crosslinking agent A and the polyacrylamide polymers are subjected to chemical crosslinking, organic zirconium is subjected to hydration, hydrolysis and olation in a solution, and mutinuclear olation complex ions are formed and crosslinked with amide groups in the polymers, accordingly, the strength of the spatial network structure is further enhanced.

Description

technical field [0001] The invention relates to oil and gas well formation fracture fracturing fluid, specifically, a method for preventing proppant in water-based fracturing fluid from settling during transportation. Background technique [0002] Hydraulic fracturing requires the use of special fluids, the purpose of which is to produce a suitable fracture size while transporting the proppant. The key to the fracturing fluid is to carry the proppant from the wellbore through the perforation to the designated position at the front of the fracture. Therefore, the fracturing fluid The ability to carry proppant is its basic requirement. It is very complicated to affect the proppant delivery capacity of fracturing fluid. Viscosity, flow rate, proppant concentration and density, etc., all affect the settling velocity of proppant. Most fracturing fluids are non-Newtonian fluids, and the viscosity of the liquid decreases with the increase of the shear rate, while the general polym...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/70
CPCC09K8/602C09K8/604C09K8/685C09K8/70C09K8/887C09K2208/06
Inventor 任山寇将张邵彬唐朝钧康毅
Owner CHENGDU LEARN PRACTICES TECH CO LTD
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