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Viscosity reducer for reducing the viscosity of plant gum temporary plugging rubber plug base solution, and preparation method thereof

A technology of rubber stopper base fluid and vegetable glue, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of unexplained high-viscosity base fluid, and achieve the effect of improving construction difficulties and reducing viscosity

Active Publication Date: 2020-03-24
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent CN106350043A mentions that soluble polymers can be used in carboxymethyl starch with self-expanding function to form temporary plugging agents; Chinese patent CN107129560A mentions a method for synthesizing temporary plugging particles with plant gums such as corn starch as raw materials; China Patent CN103725275A mentions a method of mixing polymers and vegetable gums as raw materials to synthesize plugging plugs; however, the above-mentioned methods all inscribe using vegetable gums as raw materials for rubber plugs, but they do not explain how the prepared high-viscosity base liquid is applied instead of Affecting the effect

Method used

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  • Viscosity reducer for reducing the viscosity of plant gum temporary plugging rubber plug base solution, and preparation method thereof

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Effect test

Embodiment 1

[0045] This embodiment provides a viscosity reducer for reducing the viscosity of the base liquid of vegetable glue temporary plugging plugs, which is prepared by a preparation method comprising the following steps:

[0046]Add 10V / V% (25mL) boric acid to 250mL of mixed solvent of water and glycerol (mixing ratio is 1:1 by volume), raise the temperature to 75°C, stir at this temperature for 20min until the boron compound is completely dissolved, then add 2V / V% (2.5mL) sodium hydroxide adjusted the reaction pH value to be alkaline, the mixture was warmed up to 90°C, during which the temperature was kept substantially constant, and 10V / V% (25mL) sodium gluconate was added under low-speed stirring conditions, After reacting for 4 hours, an organic boron solution can be obtained. After the organic boron solution is cooled, add borax, and mix the two at a volume ratio of 1:1 to form a semi-solid substance; put the semi-solid substance in a dryer to dry it into a solid state, and th...

Embodiment 2

[0048] This embodiment provides a viscosity reducer for reducing the viscosity of the base liquid of vegetable glue temporary plugging plugs, which is prepared by a preparation method comprising the following steps:

[0049] Add 12V / V% (60mL) borax to 500mL of mixed solvent of water and glycerol (mixing ratio is 1:3 by volume), raise the temperature to 70°C, stir at this temperature for 20min until the boron compound is completely dissolved, then add 1V / V% (5mL) sodium hydroxide and 3V / V% (15mL) sodium bicarbonate adjusted the pH value of the reaction to be alkaline, the mixture was heated to 90°C, during which the temperature was kept substantially constant, and 25V was added under low-speed stirring / V% (125mL) sodium alginate, react for 4.5 hours to obtain an organoboron solution. After the organic boron solution is cooled, add borax, and mix the two at a volume ratio of 1:1 to form a semi-solid substance; put the semi-solid substance in a dryer to dry it into a solid state...

Embodiment 3

[0051] This embodiment provides a base liquid of vegetable gum temporary stopper, which is prepared by a method comprising steps:

[0052] The viscosity reducer A that obtains in embodiment 1 joins in guar gum and forms mixture with it, wherein, the volume ratio of viscosity reducer A and guar gum is 0.8:5;

[0053] Then dissolve the mixture in water, and the volume ratio of the two is 6:100 to prepare the base liquid of the plant gum temporary stopper, which is designated as base liquid A.

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Abstract

The invention provides a viscosity reducer for reducing the viscosity of a plant gum temporary plugging rubber plug base solution, and a preparation method thereof. The method comprises the followingsteps: (1) adding a boron compound into a mixed solvent, and completely dissolving the boron compound to obtain a solution A; (2) adding an alkali into the solution A to adjust the system to be alkaline, raising the temperature of the system, adding polyhydroxy acid salt under a stirring condition, and carrying out a reaction to obtain an organic boron solution; (3) after the organic boron solution is cooled, adding borax into the organic boron solution to obtain a semi-solid substance; and (4) drying the semi-solid substance, grinding the dried solid substance into powder, and rounding to obtain the viscosity reducer for reducing the viscosity of a plant gum temporary plugging rubber plug base solution. The viscosity reducer is a boron ion-rich viscosity reducer, and can improve the problem of construction difficulty caused by quick swelling and high viscosity of a plant gum temporary plugging rubber plug base solution.

Description

technical field [0001] The invention relates to a viscosity reducer for reducing the viscosity of a base liquid of vegetable glue temporary plugging plugs and a preparation method thereof, belonging to the technical field of petroleum exploitation. Background technique [0002] Due to the seepage capacity between fractures or the heterogeneity of the reservoir, it will be used in refracturing of old wells, volume fracturing of unconventional reservoirs, layered fracturing of vertical wells, staged fracturing of horizontal wells, and well stimulation in complex situations. Chemical temporary plugging plugs seal old fractures, change the direction of fracturing fractures, create new fractures, improve oil flow channels, and achieve the purpose of increasing production without strongly blocking the formation rock pores. Vegetable gum temporary plugs are an important type of temporary plugs, which use high-concentration vegetable gum base liquids and cross-linking agents to form...

Claims

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Application Information

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IPC IPC(8): C09K8/514C09K8/467C09K8/42C09K8/588C09K8/68C09K8/512
CPCC09K8/514C09K8/467C09K8/426C09K8/588C09K8/68C09K8/905C09K8/887
Inventor 管保山刘玉婷梁利才博杨文轩
Owner PETROCHINA CO LTD