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Preparation method of wetting agent for oil-based drilling fluid and oil-based drilling fluid using the wetting agent

A technology of oil-based drilling fluid and wetting agent, which is applied in the fields of petroleum exploration and development and oil-based drilling fluid, can solve the problem that the drilling fluid is difficult to meet the requirements, and achieve the effects of satisfying on-site construction, improving the ROP and low plastic viscosity.

Active Publication Date: 2019-12-10
北京石大胡杨石油科技发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Drilling high-temperature deep wells, ultra-deep wells, and high-temperature shale gas wells must have matching high-temperature or ultra-high-temperature drilling fluids, but the current drilling fluids are difficult to meet the requirements

Method used

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  • Preparation method of wetting agent for oil-based drilling fluid and oil-based drilling fluid using the wetting agent
  • Preparation method of wetting agent for oil-based drilling fluid and oil-based drilling fluid using the wetting agent
  • Preparation method of wetting agent for oil-based drilling fluid and oil-based drilling fluid using the wetting agent

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] The preparation method of above-mentioned oil base drilling fluid is as follows:

[0031] (1) Measure the base oil (white oil or diesel oil) with a measuring cylinder, pour it into a high stirring cup, add the main emulsifier, auxiliary emulsifier and wetting agent, and stir at high speed for 5 minutes;

[0032] (2) Add 25% calcium chloride aqueous solution and stir for 15 minutes;

[0033] (3) Add calcium oxide, organic soil, and fluid loss control agent, and stir at high speed for 10 minutes;

[0034] (4) Add barite and stir at high speed for 30 minutes.

[0035] The high stirring refers to stirring at 12000 rev / min on a high-speed stirrer.

[0036] According to the following steps, the oil-based drilling fluids prepared in Examples 1-4 and Comparative Examples 5-6 were measured to obtain the following data:

[0037] (1) Pour the prepared oil-based drilling fluid into a measuring cup with a heating jacket, heat it to 66°C, and measure the rheology and demulsificati...

example 1

[0090] In a three-neck flask equipped with a thermometer, condenser and dehydration device, add 140g vegetable oil fatty acid, 25g maleic anhydride and a small amount of iodine, start stirring, heat the mixture to 200-220°C, react for 2-4 hours, and cool down to 130°C ℃, then add 50g of diethylenetriamine, after 160℃, the reactant starts to dehydrate, heat and dehydrate until no water comes out at 260℃, add 176g of vegetable oil fatty acid and heat to 220℃, divide the water until no more water comes out, then cool down To 130°C, add 100ml of xylene, stir evenly, and the reaction is complete.

example 2

[0092] In a three-necked flask equipped with a thermometer, a condenser and a dehydration device, add 140g of vegetable oil fatty acid, 20g of fumaric acid, and 0.3g of iodine, start stirring, heat the mixture to 200-220°C, react for 2-4 hours, and cool down to 130°C, then add 50g of diethylenetriamine, after 160°C, the reactant starts to dehydrate, heat and dehydrate until no water comes out at 260°C, add 176g vegetable oil fatty acid and heat to 220°C, react until no more water comes out. Cool down to 130°C, add 100ml of xylene, stir evenly, and the reaction is complete.

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Abstract

The invention discloses a preparation method of a wetting agent used for an oil-based drilling fluid. The method comprises the following steps: mixing and stirring vegetable oil fatty acid and maleic anhydride or fumaric acid or acrylic acid, heating the obtained mixture to 200-220 DEG C, carrying out a reaction for 2-4 h, and cooling the obtained reaction product to 130 DEG C; adding diethylenetriamine, and carrying out heating dehydration until no water is separated out at 260 DEG C; adding the vegetable oil fatty acid with the amount being 1.1-1.25 times the first-time addition amount of the vegetable oil fatty acid, heating the obtained mixture to 220 DEG C, and separating out water until no water can be separated out; and cooling the obtained material to 130 DEG C, adding xylene with the amount being 0.7 times the weight of the first-time addition amount of the vegetable oil fatty acid in order to realize dilution, and carrying out uniform stirring. The high-temperature and high-pressure filter loss of the oil-based drilling fluid using the wetting agent after 260 DEG C high temperature hot rolling for 16 h is 2.2-4.0 ml, the change of the apparent viscosity and the plastic viscosity before and after the hot rolling is small, the oil-based drilling fluid using the wetting agent has good rheological property and low plastic viscosity, facilitates the improvement of the mechanical drilling speed, and after the hot rolling, the emulsification stability is good, and the demulsification voltage is 1000 V or above.

Description

technical field [0001] The invention relates to the field of petroleum exploration and development, in particular to the field of oil-based drilling fluid. Background technique [0002] As the world's demand for oil, natural gas and shale gas resources increases, oil and natural gas drilling technology is also developing. Drilling high-temperature deep wells, ultra-deep wells, and high-temperature shale gas wells must have matching high-temperature or ultra-high-temperature drilling fluids, but the current drilling fluids are difficult to meet the requirements. Contents of the invention [0003] In view of the defects in the prior art, the invention provides a method for preparing a wetting agent for oil-based drilling fluid, comprising steps: [0004] Mix and stir vegetable oil fatty acid with maleic anhydride or fumaric acid or acrylic acid, heat to 200-220°C for 2-4 hours, then cool down to 130°C; [0005] Add diethylenetriamine, heat and dehydrate until no water come...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C09K8/32
CPCC09K8/035C09K8/32
Inventor 徐同台严海源李银素王伟杨艳荆鹏
Owner 北京石大胡杨石油科技发展有限公司
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