Guar gum grafted copolymer nanocomposite gel fracturing fluid and preparation method thereof

A graft copolymer and jelly fracturing fluid technology is applied in the field of guar gum graft copolymer nanocomposite jelly fracturing fluid and its preparation, and can solve the problem of insufficient viscoelastic performance and stability, temperature resistance and shear resistance. problems such as poor cutting properties, to achieve the effect of increasing interaction, stabilizing performance, and solving dispersion problems

Active Publication Date: 2020-12-22
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned problems existing in the prior art, the present invention provides a kind of guar gum graft copolymer nanocomposite jelly fracturing fluid and its preparation method, can make the guar gum graft copolymer n...

Method used

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  • Guar gum grafted copolymer nanocomposite gel fracturing fluid and preparation method thereof
  • Guar gum grafted copolymer nanocomposite gel fracturing fluid and preparation method thereof
  • Guar gum grafted copolymer nanocomposite gel fracturing fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] A kind of guar gum graft copolymer nanocomposite jelly fracturing fluid, comprises following mass percentage components: guar gum graft copolymer thickener 0.5%, nano silicon dioxide powder 0.1% and borax 0.3%, remainder The amount is water.

[0044] Wherein, the guar gum graft copolymer thickener is synthesized by the following components by weight: 3 parts of guar gum powder, 8 parts of acrylamide, 0.8 part of cerium ammonium nitrate and 900 parts of water.

[0045] Guar gum graft copolymer thickener is synthesized by the following method:

[0046] (1) Slowly add guar gum powder under a water bath condition of 40° C. and 600 r / min, stir for 30 minutes and then stand at 30° C. for 4 hours to obtain an aqueous solution of guar gum;

[0047] (2) dissolving acrylamide in water, and adjusting the pH value to 7±0.5 with 25wt% sodium hydroxide solution to obtain a monomer solution;

[0048] (3) Add the monomer solution obtained in step (2) into the guar gum aqueous solutio...

Embodiment 2

[0055] A guar graft copolymer nanocomposite jelly fracturing fluid, comprising the following components in mass percentage: 0.6% of guar graft copolymer thickener, 0.1% of cellulose nanofiber and triethanolamine boron crosslinking agent 0.8%, the balance is water.

[0056] Wherein, the guar gum graft copolymer thickener is synthesized by the following components by weight: 5 parts of guar gum powder, 7 parts of acrylamide, 6 parts of 2-acrylamido-2-methylpropanesulfonic acid, nitric acid 1 part of ammonium cerium and 1200 parts of water.

[0057] Guar gum graft copolymer thickener is synthesized by the following method:

[0058] (1) Slowly add guar gum powder under a water bath condition of 40°C and 800r / min, stir for 60min and then stand at 30°C for 4h to obtain an aqueous solution of guar gum;

[0059] (2) dissolving acrylamide and 2-acrylamido-2-methylpropanesulfonic acid in water, and adjusting the pH value to 7±0.5 with 25 wt% sodium hydroxide solution to obtain a monom...

Embodiment 3

[0067] A guar gum graft copolymer nanocomposite jelly fracturing fluid, comprising the following components in mass percentage: 0.5% of guar gum graft copolymer thickener, 0.2% of sodium montmorillonite powder and zirconium lactate crosslinking Agent 0.5%, the balance is water.

[0068] Wherein, the guar gum graft copolymer thickener is synthesized by the following components by weight: 6 parts of hydroxypropyl guar gum powder, 9 parts of acrylamide, 1 part of acrylic acid, 2-acrylamido-2-methyl 10 parts of propanesulfonic acid, 0.5 parts of potassium persulfate and 1000 parts of water.

[0069] Guar gum graft copolymer thickener is synthesized by the following method:

[0070] (1) Slowly add hydroxypropyl guar gum powder under a water bath condition of 40°C and 1000r / min, stir for 60 minutes and then stand at 30°C for 4 hours to obtain an aqueous solution of guar gum;

[0071] (2) dissolving acrylamide, acrylic acid, and 2-acrylamido-2-methylpropanesulfonic acid in water, a...

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Abstract

The invention provides a guar gum grafted copolymer nanocomposite gel fracturing fluid and a preparation method thereof. The fracturing fluid comprises the following components in percentage by mass:0.4-1.2% of a guar gum grafted copolymer thickening agent, 0.05-0.5% of a nanomaterial and 0.2-1% of a cross-linking agent, with the balance being water. According to the invention, guar gum or a derivative thereof and acrylamide monomers are used as raw materials to synthesize a guar gum graft copolymer, the guar gum graft copolymer is used as the thickening agent, a nanomaterial dispersion liquid is added, and the nanocomposite gel fracturing fluid is prepared under the action of the cross-linking agent. Hydrophilic flexible polymer branched chains are introduced to semi-rigid macromolecularchains of guar gum, so mutual entanglement and adsorption between the guar gum and the nanomaterial are facilitated, the compatibility of the guar gum and the nanomaterial can be greatly improved, and interaction between the nanomaterial and a polymer matrix is further improved; and the prepared nanocomposite gel fracturing fluid has better temperature resistance, shearing resistance, sand carrying property and filtrate loss reduction property.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a guar gum graft copolymer nanocomposite jelly fracturing fluid and a preparation method thereof. Background technique [0002] Hydraulic fracturing is an important stimulation measure in the development of low permeability oil and gas reservoirs. It uses surface high-pressure pumps to inject viscous liquid into the well, and builds up high pressure at the bottom of the well. When the pressure exceeds the in-situ stress near the well wall and the tensile strength of the rock, cracks will be generated in the formation near the bottom of the well, and the belt will continue to be damaged. The sand-carrying fluid with proppant is injected into the fracture, which extends forward and fills the fracture with proppant. After the pump is stopped, the high-viscosity liquid gradually breaks and returns to the ground, while the proppant stays in the fract...

Claims

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Application Information

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IPC IPC(8): C09K8/68C09K8/66C09K8/90C09K8/88C09K8/70C08F251/00C08F220/56C08F220/58C08F220/06
CPCC09K8/68C09K8/665C09K8/685C09K8/887C09K8/90C09K8/882C09K8/70C08F251/00C09K2208/10C08F220/56C08F220/585C08F220/06
Inventor 丁瑜辜思曼
Owner SOUTHWEST PETROLEUM UNIV
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