Unlock instant, AI-driven research and patent intelligence for your innovation.

Viscosity reducer for reducing the viscosity of vegetable glue temporary plugging base fluid 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: 2022-08-05
PETROCHINA CO LTD
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Viscosity reducer for reducing the viscosity of vegetable glue temporary plugging base fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

Embodiment 2

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

[0049] Add 12V / V% (60mL) borax to a mixed solvent of 500mL water and glycerol (mixing ratio is 1:3 by volume), heat up 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 were used to adjust the pH of the reaction to an alkaline value, the mixture was heated to 90°C, and the temperature was kept substantially constant during this period, and 25V was added under low-speed stirring conditions. / V% (125 mL) sodium alginate, react for 4.5 hours to obtain an organic boron solution. After the organic boron solution is cooled, borax is added, and the two are mixed in a volume ratio of 1:1 to form a semi-solid substance; the semi-solid substance is put into a dry...

Embodiment 3

[0051] The present embodiment provides a vegetable glue temporary plugging base liquid, which is prepared by adopting a method comprising steps:

[0052] The viscosity-reducing agent A obtained in Example 1 is added to the guar gum to form a mixture, wherein the volume ratio of the viscosity-reducing agent A and the guar gum is 0.8:5;

[0053] The mixture was then dissolved in water, and the volume ratio of the two was 6:100 to prepare the vegetable glue temporary plugging base liquid, which was recorded as base liquid A.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
viscosityaaaaaaaaaa
Login to View More

Abstract

The present invention provides a viscosity reducer for reducing the viscosity of vegetable glue temporary plugging base liquid and a preparation method thereof. The method includes the following steps: (1) adding a boron compound to a mixed solvent, and making the boron compound completely Dissolving to obtain solution A; (2) adding alkali to the solution A to adjust the system to be alkaline; then heating the system, and adding polyhydroxy acid salts under stirring conditions to react to obtain an organic boron solution; ( 3) after the described organic boron solution is cooled, add borax to it again to obtain a semi-solid substance; (4) dry the semi-solid substance, and then grind the obtained solid substance into powder and spheronize after the drying , to obtain the viscosity reducing agent for reducing the viscosity of the vegetable glue temporary plugging glue plug base fluid. The viscosity reducer is a boron ion-rich viscosity reducer, which can improve the construction difficulties caused by the rapid swelling and high viscosity of the vegetable glue temporary plugging plug base liquid.

Description

technical field [0001] The invention relates to a viscosity reducing agent for reducing the viscosity of a temporary plugging rubber stopper base liquid with vegetable glue and a preparation method thereof, and belongs to the technical field of petroleum exploitation. Background technique [0002] Due to the seepage ability between fractures or the heterogeneity of the reservoir, it will be used in the re-fracturing of old wells, volume fracturing of unconventional reservoirs, stratified fracturing of vertical wells, staged fracturing of horizontal wells and well stimulation in complex situations. The chemical temporary plugging plugs the old fractures, and changes the direction of the fractured fractures without strongly blocking the pores of the formation rock, creating new fractures, improving the oil flow channel, and achieving the purpose of increasing production. Plant glue temporary plugging plugs are an important type of temporary plugging plugs, which are high-stren...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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