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Environmental-friendly organic silicon water blocking prevention agent for drilling fluid and preparation method and application thereof

A technology of waterproof locking agent and organosilicon, applied in the field of petroleum exploration, can solve the problems of high cost, unenvironmental protection and poor effect of waterproof locking agent, and achieve the effects of low foaming rate, improved permeability and safe preparation method

Active Publication Date: 2018-09-04
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the deficiencies of high cost, poor effect, and non-environmental protection of commonly used waterproof locking agents at present, the purpose of the present invention is to provide an environmentally friendly silicone waterproof locking agent for drilling fluid and its preparation method; the purpose of the present invention is also to provide the Application of Silicone Waterproof Locking Agent in Low Permeability Tight Gas Reservoirs

Method used

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  • Environmental-friendly organic silicon water blocking prevention agent for drilling fluid and preparation method and application thereof
  • Environmental-friendly organic silicon water blocking prevention agent for drilling fluid and preparation method and application thereof
  • Environmental-friendly organic silicon water blocking prevention agent for drilling fluid and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] This example provides a method for preparing an environment-friendly silicone waterproof locking agent for drilling fluid. The preparation flow chart is as follows: figure 1 shown, including the following steps:

[0050] Step 1, add 20.0g ethanol, 20.0g dimethyldimethoxysilane, 10.0g dimethyldiethoxysilane, 5.0g methyltrimethoxysilane and 5.0g methyl Triethoxysilane was heated up to 50-60° C., stirred evenly, and then 8.4 g of 10% hydrochloric acid solution was added dropwise, and hydrolysis reaction was carried out for 1 h after the dropwise addition was completed for 5 minutes.

[0051] Step 2, dropwise add 0.5g of vinyltriethoxysilane, 0.5g of methylvinyldimethoxysilane and 1.0g of methylvinyldiethoxysilane, and perform hydrolysis after 0.5h dropwise Condensation reaction 1.5h;

[0052] Step 3, continue to heat up to 60-75 ° C, add dropwise 10 g of 14% 2-acrylamide-2-methylpropanesulfonic acid aqueous solution and 10 g of 0.1% azobisisobutyronitrile (AIBN ) ethano...

Embodiment 2

[0058] This example provides a method for preparing an environment-friendly silicone waterproof locking agent for drilling fluid. The preparation flow chart is as follows: figure 1 shown, including the following steps:

[0059] Step 1, add 20.0g of isopropanol, 20.0g of dimethyldimethoxysilane, 15.0g of dimethyldichlorosilane and 5.0g of diphenyldimethoxy in a 500mL stirred reactor Silane, heated up to 50-60°C, stirred evenly, then added dropwise 7.2g of sulfuric acid solution with a mass fraction of 10%, and carried out hydrolysis reaction for 1h after the dropwise addition was completed for 5 minutes.

[0060] Step 2, dropwise add 1.0g of vinyltriethoxysilane, 0.5g of vinyltris(2-methoxyethoxy)silane and 0.5g of vinyltriisopropoxysilane, add dropwise for 0.5h Carry out hydrolysis condensation reaction 2h after finishing;

[0061] Step 3, continue to heat up to 60-75°C, add dropwise 10g of 14% 2-hydroxy-3-allyloxy-1-propenesulfonic acid aqueous solution and 10g of 0.1% azob...

Embodiment 3

[0067] This example provides a method for preparing an environment-friendly silicone waterproof locking agent for drilling fluid. The preparation flow chart is as follows: figure 1 shown, including the following steps:

[0068] Step 1, add 20.0g toluene, 20.0g dimethyldimethoxysilane, 15.0g dimethyldiethoxysilane and 5.0g dodecyltrichlorosilane to a 500mL stirred reactor, and heat up to 50 -60°C, after stirring evenly, 8.0 g of hydrochloric acid solution with a mass fraction of 10% was added dropwise, and the hydrolysis reaction was carried out for 1 h after the dropwise addition was completed for 5 minutes.

[0069] Step 2: Add 0.4 g of vinyltrichlorosilane, 1.0 g of vinyltriethoxysilane and 1.0 g of vinyltrimethoxysilane dropwise, and carry out hydrolysis and condensation reaction for 1.5 h after the dropwise addition for 0.5 h;

[0070] Step 3, continue to heat up to 60-75°C, add 10g of 14% 2-acrylamide-2-methylpropanesulfonic acid (AMPS) solution and 10g of 0.1% lauryl pe...

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Abstract

The invention provides an environmental-friendly organic silicon water blocking prevention agent for a drilling fluid and a preparation method and application thereof. The organic silicon water blocking prevention agent comprises a hydrophobic group and a hydrophilic group, wherein the hydrophobic group is a polymethyl hydrosiloxane chain; the hydrophilic group is a sulfonic acid group and hydroxyl. The organic silicon water blocking prevention agent is prepared from methylsiloxane and vinyl siloxane through hydrolytic condensation reactions and grafting reactions with sulfonic acid group monomers. By adopting the organic silicon water blocking prevention agent provided by the invention, surface tension can be relatively well reduced, water wetting on the surfaces of pores can be turned into vapor wetting, flow-back of filtrate can be improved, gas permeability can be improved, and water blocking damage caused by a reservoir can be remarkably reduced; in addition, the organic silicon water blocking prevention agent is low in foaming rate, good in foam inhibition and elimination property, easy in preparation raw material obtaining, safe and feasible in reaction condition and easy inindustrial production.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration, and relates to an environment-friendly silicone waterproof locking agent for drilling fluid and a preparation method and application thereof. Background technique [0002] Low-permeability tight gas reservoirs are an important type of oil and gas reservoirs in China's oil and gas basins. my country's cumulative proven low-permeability oil and gas reserves have exceeded 50% of the country's total proven oil and gas reserves. In my country's Tarim, Songliao, Ordos, Junggar and Among the new proven oil and gas reserves in Qaidam and other oil and gas basins, low permeability oil and gas reserves account for the main body of the remaining proven reserves. Low-permeability reservoirs generally have the characteristics of high content of muddy cement, small pore throats, ultra-low permeability, ultra-low porosity, and ultra-low water saturation, resulting in high capillary pressure, strong...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F283/12C08F220/58C08F228/02C08G77/20C08G77/06
CPCC08F283/124C08G77/06C08G77/20C09K8/035C08F220/585
Inventor 张洁姚旭洋王双威赵志良张蝶尹达王立辉李龙王茜李家学
Owner BC P INC CHINA NAT PETROLEUM CORP
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