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A kind of desulfonated environment-friendly water-based drilling fluid and preparation method thereof

A water-based drilling fluid, environmentally friendly technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as unknown economy and lack of universality, achieve a wide range of applications and meet field application requirements , the effect of easy availability of materials

Active Publication Date: 2022-04-12
CNPC BOHAI DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the treatment agents used in the former are self-produced by the company and are not universal; the latter is suitable for freshwater drilling fluid systems, but for brine drilling fluid systems, high-density drilling fluid systems, highly deviated / extended reach well drilling fluid systems Applicable, still unknown
Moreover, neither field experiment has been carried out, so it is unknown how effective the field application will be and how economical it will be

Method used

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  • A kind of desulfonated environment-friendly water-based drilling fluid and preparation method thereof
  • A kind of desulfonated environment-friendly water-based drilling fluid and preparation method thereof
  • A kind of desulfonated environment-friendly water-based drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A freshwater well desulfonated environment-friendly water-based drilling fluid product I, its preparation method is as follows:

[0034] S1. Measure 50 parts by weight of solvent water, add 5 parts by weight of calcium-based bentonite sodium-modified bentonite and 0.25 parts by weight of anhydrous sodium carbonate while stirring, stir at a low speed of 3000r / min for 1h, and maintain at room temperature for 24h to prepare into pre-hydrated bentonite slurry;

[0035] S2. Measure 50 parts by weight of solvent water, slowly add 0.2 parts by weight of PAC-LV, 0.1 parts by weight of FA-367, and 0.2 parts by weight of IND30 while stirring, stir at low speed for 1 hour, and maintain at room temperature for 24 hours to make a coating inhibitor glue ;

[0036] S3. Put the pre-hydrated bentonite slurry prepared in step S1 and the coated inhibitor glue prepared in step S2 into a high stirring cup, and add 1 part by weight of GWFL-N, 2 parts by weight of Si-SCMC, 1 part by weight ...

Embodiment 2

[0038] A brine well desulfonated environment-friendly water-based drilling fluid product II, the preparation method of which is as follows:

[0039] S1. Measure 30 parts by weight of solvent water, add 3 parts by weight of natural sodium bentonite and 0.09 parts by weight of anhydrous sodium carbonate while stirring, stir at a low speed of 3000r / min for 1 hour, and maintain at room temperature for 24 hours to make a pre-hydrated bentonite slurry;

[0040] S2. Measure 40 parts by weight of solvent water, slowly add 0.1 parts by weight of PAC-LV, 0.1 parts by weight of PAC-HV, and 0.2 parts by weight of IND30 while stirring, stir at low speed for 1 hour, and maintain at room temperature for 24 hours to make a coating inhibitor glue ;

[0041] S3. Put the pre-hydrated bentonite slurry prepared in step S1, the coating inhibitor glue prepared in step S2, and the remaining 30 parts by weight of solvent water into a high stirring cup, and then add 1 part by weight of HFLD-1, 1 part...

Embodiment 3

[0043] A highly deviated well / extended reach well desulfonated environment-friendly water-based drilling fluid product III, the preparation method of which is as follows:

[0044] S1. Measure 30 parts by weight of solvent water, add 3 parts by weight of calcium-based bentonite sodium-modified bentonite and 0.15 parts by weight of anhydrous sodium carbonate while stirring, stir at a low speed of 3000r / min for 1h, and maintain at room temperature for 24h to prepare into pre-hydrated bentonite slurry;

[0045] S2. Measure 50 parts by weight of solvent water, slowly add 0.2 parts by weight of FA367 and 0.3 parts by weight of IND30 while stirring, stir at a low speed for 1 hour, and maintain at room temperature for 24 hours to prepare a coating inhibitor glue;

[0046] S3. Put the pre-hydrated bentonite slurry prepared in step S1, the coated inhibitor glue prepared in step S2, and the remaining 20 parts by weight of solvent water into a high stirring cup, and then add 2 parts by w...

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Abstract

The invention discloses a desulfonated environment-friendly water-based drilling fluid and a preparation method thereof. The drilling fluid comprises 100 parts by weight of solvent water, 2-5 parts of bentonite, 0.1-0.25 parts of anhydrous sodium carbonate, 0.4- 0.5 parts of coating inhibitor, 3 to 5 parts of fluid loss reducer, 2 to 3 parts of plugging and anti-slump agent, 1 to 3 parts of lubricant, 1 to 3 parts of shielding temporary plugging agent, 0 to 400 parts of barite and 0 ~10 parts of sodium chloride; specifically, by preparing pre-hydrated bentonite slurry; preparing coated inhibitor glue; mixing water, pre-hydrated bentonite slurry, coated inhibitor glue, fluid loss reducer, plugging and anti-collapse The drilling fluid is prepared by mixing and stirring well with the agent, lubricant and shielding temporary plugging agent, and selectively adding sodium chloride and barite; the drilling fluid abandons the sulfonation treatment agent, and the raw materials are widely sourced and easy to obtain, which is not only suitable for freshwater wells , and is suitable for brine wells, high-inclination wells / extended-reach wells, high-temperature and high-density wells, has good field application effects, meets environmental protection requirements, and has a simple preparation method and easy control of conditions, realizing the unity of economic and social benefits.

Description

technical field [0001] The invention relates to the technical field of downhole operations in oil and gas fields, in particular to a desulfonated environment-friendly water-based drilling fluid and a preparation method thereof. Background technique [0002] As the environmental protection situation becomes increasingly severe, government departments have higher and higher requirements for environmental protection, and management efforts are also increasing. The impact of drilling fluid and cuttings on the environment has become the focus of environmental protection departments, and the discharge of drilling waste fluid and solids is also strictly restricted. At present, sulfonated materials account for a considerable proportion of the drilling fluid treatment agents used in the drilling process, and the proportion of sulfonated materials in the temperature-resistant and salt-resistant treatment agents is even higher. The monomers used to synthesize sulfonated materials are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/20C09K8/24C09K8/16C09K8/22
CPCC09K8/206C09K8/24C09K8/16C09K8/22C09K2208/10C09K2208/34
Inventor 田惠张克正黄峰史野黄臣吕东华何鹏田增艳崔节磊邢海楠齐昌利
Owner CNPC BOHAI DRILLING ENG
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