RU2199570C1 - Complex-action reagent for process fluids employed in boring and major repair of wells - Google Patents

Abstract

FIELD: drilling engineering. SUBSTANCE: reagent containing lubricating and stabilizing component and solvent is characterized by that the former is ethanolamine-modified vat residue of synthetic fatty acids production and components are taken in following proportions, wt.%: vat residue, 47.0-50.0; ethanolamines, 1.0-3.0; and solvent, 49.0-50.0. Ethanolamines are, in particular, monoethanolamine, diethanolamine, or triethanolamine, and solvent is diesel fuel or kerosene. EFFECT: improved lubricating properties of visco-plastic washing fluids and stabilized inert emulsions utilized in boring and repair of wells. 3 cl, 2 tbl, 4 ex

Description

 The invention relates to the field of complex chemicals for process fluids used in drilling and workover.

 Known reagent for drilling fluids - "SNPCH-6016" containing 90% oleic acid and 10% of the bottom residue of the production of butyl alcohols / G. A. Orlov, M.Sh. Kendis, V.N. Glushchenko. The use of inverse emulsions in oil production. M .: Nedra, 1991, p. 421 /. A known reagent is obtained by simple mixing of the starting components.

The disadvantages of the known reagent "SNPCH-6016" are:
1) low storage stability due to a change in the composition of the lubricant additive due to the polymerization of oleic acid, as well as the polycondensation and oxidation of butyric and isobutyric aldehydes contained in the bottoms of butyl alcohols;
2) a sufficiently high toxicity and carcinogenicity of bottoms of butyl alcohols;
3) the heterogeneity of the composition and, as a consequence, the need to mix thoroughly before use;
4) the absence of any structure-forming properties;
5) low filtration characteristics;
6) a high value of the wear rate of steel (tribological parameter) 48 mm / min.

 Closest to the claimed composition (prototype) is a reagent for drilling fluids "SMAD-1", which is a 50% solution of oxidized petrolatum in diesel fuel / V. I. Tokunov. I.B. Heifetz. Hydrophobic-emulsion drilling fluids. M .: Nedra, 1983, p. 75 /. "SMAD-1" is intended to improve the lubricating properties of clay solutions and stabilize invert emulsions.

The disadvantages of the known reagent "SMAD-1" are:
1) the use of oxidized petrolatum in the composition of the reagent, which is an oxidized mixture of ceresin and oil of variable composition, adversely affects the production and regulation of the properties of drilling fluids;
2) insufficiently small filtrate recovery during stabilization of invert emulsions;
3) tribotechnical parameters (wear rate of steels) more than 0.47 mm / min;
4) the electrical stability of the invert emulsion based on "SMAD-1" is not higher than 250 V.

5) low structural and mechanical properties of invert emulsions;
6) heterogeneity of the composition associated with low selectivity for the oxidation of ceresin and oil, which are part of the petrolatum;
7) the floating value of the acid number "SMAD-1", which is poorly reflected in the quality of the lubricant additive and leads to inconsistency in the characteristics of manufactured batches of "SMAD-1".

 The present invention solves the technical problem of improving the lubricating properties of viscous-plastic washing fluids and stabilization of invert emulsions used in drilling and well repair.

This problem is solved in that the complex action reagent for process fluids used in drilling and workover, containing a lubricating-stabilizing component and a solvent, according to the invention as a lubricating-stabilizing component contains ethanolamine-modified bottoms of synthetic fatty acids in the following ratio of ingredients, wt.%:
VAT residue of synthetic fatty acids - 47.0 ... 50.0
Ethanolamines - 1.0 ... 3.0
Solvent - 49.0 ... 50.0
Moreover, as ethanolamines, the reagent contains either monoethanolamine, or diethanolamine, or triethanolamine, and as a solvent, either diesel fuel or kerosene.

The proposed reagent is obtained by mixing the components in the indicated ratios of the ingredients at a temperature of 65-95 ^o C and stirring for 0.5-1 hours. At a temperature above 95 ^o C the physico-chemical characteristics of the reagent deteriorate.

 The content of bottoms of synthetic fatty acids (CFCFA) and ethanolamines in kerosene or diesel fuel is selected in the range of 48 ... 53 wt.%. When their content in the solution is above 53%, the pour point of the proposed reagent increases, which creates technological difficulties associated with the need to reheat the reagent. The use of a reagent with a concentration of CFCFA and ethanolamines below 48% is not rational, as the expense rates and transportation costs increase.

 Physico-chemical characteristics of the reagent are presented in table 1.

As the ingredients used:
- VAT residue of synthetic fatty acids (TU 38.1071231 -89)
- kerosene (TU 38.601-22-70-97)
- diesel fuel (GOST 305-82)
- monoethanolamine (TU 6-02-915-84)
- diethanolamine (TU 6-09-2652-91)
- triethanolamine (TU 6-02-916-79)
Performance indicators are presented in table.2.

 The amount of ethanolamine chosen by us 1.0 ... 3.0 wt.% Is optimal, since under these conditions the formation of ethanolamine salt KOSZHK and, as a result, the acid number of the proposed reagent is reduced to the desired value. The use of more ethanolamine leads to an increase in the pour point of the reagent, which is undesirable. Ethanolamine salts KOSZHK improve the operational properties of the reagent.

 Examples of the reagent.

 Example 1

To a solution of 47.36 wt. % bottoms of synthetic fatty acids (acid number 82) in 50 wt.% kerosene was added at 75 ^{° C.} 2.62 wt.% triethanolamine and stirred for 0.5-1 hours. After cooling, a dark-liquid reagent was obtained brown, T _zast. = 5 ^o C, the electrical stability of the invert emulsion = 300 V, viscosity = 30.

Example 2. To a solution of 50 wt.% VAT residues of synthetic fatty acids (acid number 82) in 49 wt.% Diesel fuel was added at 95 ^o With 1 wt. % monoethanolamine and stirred for 0.5-1 hours. After cooling, a reagent was obtained, which is a dark brown liquid, T _zast. = 4 ^o C, the electrical stability of the invert emulsion = 290 V, viscosity = 27.

Example 3. To a solution of 48 wt.% Cubic residues of synthetic fatty acids (acid number 82) in 50 wt.% Kerosene, 2 wt.% Diethanolamine was added at 65 ^{° C.} and stirred for 1.5 hours. After cooling, a liquid reagent was obtained dark brown, T _zast. = 5 ^o C, the electrical stability of the invert emulsion = 300 V, viscosity = 33.

Example 4. To a solution of 47 wt.% VAT residues of synthetic fatty acids (acid number 90) in 50 wt.% Diesel fuel was added at 75 ^{° C.} 3 wt. % triethanolamine and stirred for 0.5-1 h. After cooling, a reagent was obtained, which is a dark brown liquid, T _zast. = 0 ^o C, the electrical stability of the invert emulsion = 280 V, viscosity = 32.

 The advantages of the proposed reagent in comparison with the prototype are the following.

 1. High performance: filtration, structural-mechanical, tribotechnical, electrical stability of more than 280 V.

 2. According to the degree of exposure to the human body, the reagent is a low-hazard substance and, in accordance with the classification of GOST 12.007-76, refers to substances of hazard class IV.

 3. The use of affordable and cheap raw materials, the industrial production of which is established in the Russian Federation.

 4. The quantitative yield of the target product.

 5. The ability to regulate its acid number.

 6. One-stage receipt.

 7. Lack of production waste.

 The proposed reagent is intended as a stabilizer of hydrophobic emulsion solutions, as well as to increase the lubricity of viscoplastic washing fluids used in drilling and well repair.

Claims (2)

1. The complex action reagent for process fluids used in drilling and workover, containing a stabilizing lubricant component and a solvent, characterized in that it contains a cubic residue of synthetic fatty acids modified with ethanolamines in the following ratio of components, wt. .%:
VAT residue of synthetic fatty acids - 47.0-50.0
Ethanolamines - 1.0-3.0
Solvent - 49.0-50.0
2. The reagent according to claim 1, characterized in that it contains monoethanolamine, or diethanolamine, or triethanolamine as ethanolamines.  3. The reagent according to claim 1, characterized in that it contains diesel fuel or kerosene as a solvent.

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