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Whole oil-based drilling fluid viscosifier and preparation method thereof

A drilling fluid and all-oil-based technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems affecting the use of low-density all-oil-based drilling fluids, and cannot achieve viscosity increase and cutting, and achieve improvement The effects of rheological properties, high dynamic shear force, and easy availability of raw materials

Inactive Publication Date: 2017-05-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, drilling fluid viscosifiers at home and abroad are mainly used for water-based drilling fluids, but because all-oil-based drilling fluids do not contain water, these water-based drilling fluid viscosifiers are difficult to use in all-oil-based viscosifiers. Dissolving and stretching, so it cannot play the role of thickening and cutting
Therefore, when using full oil-based drilling fluid at this stage, the viscosity shear requirement of the drilling fluid is mainly achieved by adding organic soil and asphalt to it, but organic soil, asphalt and other substances will significantly increase the viscosity of the full oil-based drilling fluid. The density seriously affects the use of low-density oil-based drilling fluids in low-pressure reservoirs

Method used

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  • Whole oil-based drilling fluid viscosifier and preparation method thereof
  • Whole oil-based drilling fluid viscosifier and preparation method thereof
  • Whole oil-based drilling fluid viscosifier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Preparation of polyester polyol

[0032] In the autoclave, add 80g of n-butanol and 180g of phthalic anhydride, blow nitrogen for 10min to get rid of the air in the reaction environment, and then under the condition of nitrogen protection, control the stirring rate to 2000r / min to raise the temperature of the system to 100°C until the reaction The system is a transparent solution, then add 0.6g of p-toluenesulfonic acid, react for 1 hour, raise the temperature to 180°C, continue the reaction for 2 hours, then stop the reaction, cool down, and seal the prepared polyester polyol for storage.

[0033] 2) Preparation of tackifier

[0034] At room temperature, 40 g of the polyester polyol prepared above, 10 g of sulfoisophthalate and 240 g of toluene were added to the reaction kettle, and mixed uniformly to obtain a mixture;

[0035] Raise the temperature of the above mixture to 55°C, control the stirring rate to 2000r / min, add 80g of cyclohexyl isocyanate dropwise at a ...

Embodiment 2

[0038] 1) Preparation of polyester polyol

[0039] In the autoclave, add 80g of ethylene glycol and 150g of adipic acid, feed argon for 10 minutes to get rid of the air in the reaction environment, then under the condition of argon protection, control the stirring rate to 2500r / min to raise the temperature of the system to 120 ℃, until the reaction system is a transparent solution, then add 0.8g titanium tetraisopropoxide, react for 1 hour, then raise the temperature to 160 ℃, stop the reaction after continuing the reaction for 2 hours, cool down, and seal the prepared polyester polyol for storage.

[0040] 2) Preparation of tackifier

[0041] At room temperature, 20 g of the polyester polyol prepared above, 4 g of sulfoisophthalate and 100 g of ethyl acetate were added to the reaction kettle, and mixed uniformly to obtain a mixture;

[0042] Raise the temperature of the above mixture to 40°C, control the stirring rate to 2000r / min, add 32g of toluene diisocyanate dropwise at...

Embodiment 3

[0045] 1) Preparation of polyester polyol

[0046] In the autoclave, add 40g of the mixture of ethylene glycol and 1,2-butanediol and 50g of the mixture of adipic acid and sebacic acid, feed argon for 10min to get rid of the air in the reaction environment, and then protect the mixture under argon Under certain conditions, control the stirring rate to 3000r / min to raise the temperature of the system to 100°C until the reaction system is a transparent solution, then add 0.3g of benzoyl peroxide, react for 1 hour, heat up to 200°C, continue the reaction for 4 hours, then stop the reaction , cooled, and the prepared polyester polyol is sealed and preserved.

[0047] 2) Preparation of tackifier

[0048] At room temperature, 15 g of the mixture of polyester polyol, diamide and sulfoisophthalate, 140 g of the mixture of ethyl acetate and ethanol, and 140 g of the mixture of polyester polyol, diamide and sulfoisophthalate prepared above were added to the reaction kettle, and mixed u...

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Abstract

The invention provides a whole oil-based drilling fluid viscosifier and a preparation method thereof. The preparation method for the whole oil-based drilling fluid viscosifier comprises the steps: 1) uniformly mixing 15-50 parts by weight of polyester polyol, 5-15 parts by weight of a polymerization promoter and 50-150 parts by weight of a solvent at room temperature so as to obtain a mixture; 2) heating the mixture to 40-60 DEG C, adding 15-80 parts by weight of isocyanate and 0.3-1.0 part of a polymerization catalyst under a stirring condition, and continuing to heat the mixture to 70-90 DEG C and enabling the mixture to react for 3-5 h so as to obtain an intermediate product; and 3) cooling the intermediate product to 40-50 DEG C, adding 5-15 parts by weight of a polymerization promoter, heating to 60-80 DEG C and continuing a reaction for 2-3 h so as to obtain the whole oil-based drilling fluid viscosifier. The whole oil-based drilling fluid viscosifier prepared by the preparation method can effectively improve suspension stability of a drilling fluid and improve the rheological property of the drilling fluid without changing the density of the drilling fluid; and therefore, the whole oil-based drilling fluid viscosifier is suitable for exploration and development of low pressure reservoirs.

Description

technical field [0001] The invention relates to oil exploitation technology, in particular to an all-oil-based drilling fluid viscosifier and a preparation method thereof. Background technique [0002] At present, the exploration and development of oil and gas fields around the world has shifted from good exploration and development conditions such as large integrated oil fields, high pressure and conventional pressure, medium and high permeability homogeneous sandstone reservoirs, to complex small and medium oil and gas fields, fault block oil and gas fields, thin oil layers, low pressure and low permeability Low-yield oilfields, heavy oil and super-heavy oil reservoirs and other harsh exploration and development conditions, and due to the long-term efficient development of old oilfields, formation pressure gradually reduced and large-scale development of buried hill reservoirs, low-density all-oil-based drilling fluid Came into being. The all-oil-based drilling fluid not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/32C08G18/42C08G18/76C08G18/75
CPCC09K8/32C08G18/4211C08G18/423C08G18/4236C08G18/751C08G18/7614
Inventor 陈军向兴金熊方明史茂勇段永贤何思龙李有伟
Owner PETROCHINA CO LTD
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