Lubricant for drill fluids

FIELD: oil and gas industry.

SUBSTANCE: lubricant for drill fluids include, wt %: phosphatide concentrate extracted from sunflower oil, 70-90, tar oil received by distillation of fatty acids extracted from soap stocks of light vegetable oils, 30-10.

EFFECT: exclusion of use of food vegetable oils as a part of lubricant, improvement of antifriction and antiwear properties of lubricant under high loads, fat-and-oil industry waste disposal.

5 tbl

 

The invention relates to the drilling of oil wells, and in particular to lubricating additives for treatment of drilling fluids.

Known lubricating additive based soap stocks of vegetable oils and animal fats in combination with a special reagent (as the USSR №1263704, SC 7/02, 1986).

The lack of supplements is a high water content, uneven structure and a high viscosity aqueous suspension complicating transportation and unloading of product.

Known lubricant additive containing phosphatidyl concentrate, cottonseed oil, and water (Patent RF №2092516, SC 7/02, 1997).

The lack of supplements is the water content (up to 50%) and lack of high lubricating properties.

Known lubricating composition to drilling fluids based on vegetable oils containing triglycerides of saturated and unsaturated fatty acids and water (French Patent No. 2395303, SC 7/02, 1979).

The lack of supplements is the use of edible vegetable oils and not enough high shielding properties at high loads.

Closest to the proposed invention in composition and lubricating properties is a lubricating additive to drilling fluids, including oil and phosphatidyl concentrate containing not more than 20% saturated triglycerides (RF patent No. 2130475, SC 7/02, 1999).

The downside of this app is Cai is the use of edible oils, for example, sunflower and rapeseed.

Given that phosphatidy concentrate itself contains from 30 to 50% vegetable oil, additive thereto addition of vegetable oil (for a total of up to 65%) is not only not justified from the point of view of commodity vegetable oils, but adds nothing from the standpoint of lubricity additives, though, and improves the rheological properties of the composition, facilitating its transportation and unloading.

The task of the invention is:

the exception is the use of edible vegetable oils in the lubricating composition additive;

- improving the lubricating properties of the additives under high loads;

- obtaining effective supplements, using waste oil industry.

The technical solution provided by the fact that the lubricating additive to drilling mud, comprising phosphatidyl concentrate, isolated from sunflower oil, additionally contains the residue from the distillation of fatty acids isolated from soap stock light vegetable oils, in the following ratio, wt.%:

Phosphatidy concentrate allocated
from sunflower oil70-90
selected from the soap stock light
vegetable oils30-10

Phosphatides are extracted from vegetable oils in the hydration process.

Phosphatides (phospholipids), extracted from vegetable oils, belong to the group of complex lipids. According to its chemical structure, they are ester compounds of phosphoric acid, diglycerides and aminoalcohols or polyhydric alcohols.

The composition of essential phosphatides are two remnant of fatty acids, therefore, phosphatides, contain virtually all the fatty acids of the respective vegetable oils.

Plant phospholipids represented mainly by fractions phosphatidylcholine (lecithine), phosphatidylethanolamine (Catalina), ofprevention, phosphatidylserine and phosphatidic acids.

Phosphatides hygroscopic. They swell in water, forming first the mucous mass, and then muddy coarse system due to the fact that dissolved in the oil phospholipids flooded anisotropic and isotropic formations of phosphatides.

The interaction energy of glycerides and phosphatides within the mixed layer reaches its maximum value at 70%containing the AI in the layer of phosphatides and 30%content of glycerides, what determines the ratio in dry phosphatide balance [Guide to research methods in the oil industry. Volume 1, book 1, VNIIG, Leningrad, 1967, p.30-45].

Raw hydration precipitate contains 55-70% water, 15-30% of phospholipids and 15-20% oil. It is easily susceptible to biological failure and requires immediate drying.

During drying, there is a significant jump in viscosity with decreasing humidity. The increase in viscosity begins at 20%humidity and reaches its maximum at a moisture content of about 8%, and then decreases rapidly in the range of decreasing humidity from 7 to 1%.

Raw hydration sediment, it is recommended to dry to a moisture content of 1% [Werfel B. the Refinement of soybean oil and waste processing. Moscow, Kolos, 1998. S-14].

Tar is obtained by distillation of fatty acids isolated from soap stock light vegetable oils.

The soap stock formed by alkali refining light vegetable oils and contains 15-30% of the total fat.

The fat part contains a neutral oil and related fatty acids in the form of sodium Soaps.

Soap stock Thomist aqueous solution of sodium hydroxide concentration of 40% to the content of free alkali of 0.5%.

The resulting soap is decomposed with sulfuric acid in a concentration of 92-95% at 20°C, washed with selected fatty acid from sulfuric acid hot what ondensation, remove the water by decantation and dried under vacuum [Manual technology for production and processing of vegetable oils and fats. Volume 4, VNIIG, Leningrad, 1975, P.78-80].

The resulting mixture of fatty acids distil at a residual pressure of 0.66 and 1.33 kPa and a temperature of 220-240°C.

After selection of the head of the faction and distillation commodity fraction of fatty acids get bottoms distillation residue (tar) from the distillation of fatty acids isolated from vegetable oil soap stock.

Tar is a dark brown oily liquid and has the following qualitative characteristics [Leviticus MS Distillation of natural fatty acids. M: Food industry, 1971]:

Acid number, mg KOH/g, not less than50
The saponification number, mg KOH/g140-160
The pour point of fatty acids, °C18-22
Mass fraction of ash, %, max0,04
Mass fraction of moisture, %, max2,0

The lubricating composition is prepared by mixing the components.

For this phosphatidy concentrate, dried to a moisture content of 2-5%, and hydronet distillation of fatty acids, selected from the soap stock light vegetable oils, with a humidity of not more than 2% of serves in a mixing device for the homogenization of the mixture.

Formulations of lubricating additives to drilling mud (FCG) and additives adopted for the prototype (FC-1), are presented in tables 1-3.

Conducted by the applicant's analysis of the prior art, including searching by the patent and scientific information sources, and identify sources that contain information about the equivalents of the claimed invention, has allowed to establish that the applicant is not detected similar, characterized by signs, identical to all the essential features of the claimed invention, and a comparative analysis of the composition of the inventive lubricant additives (FCG) and lubricant additives (FC-1), adopted for the prototype, revealed the essential distinguishing features of the claimed object set forth in the claims.

The test results of the inventive additives FCG in comparison with the addition of FC-1, adopted for the prototype, shown in tables 4, 5.

Tribological properties of lubricating additives were evaluated on a 4-ball machine friction in accordance with GOST 9490-75 "lubricating Materials. Liquid and plastic".

The test time of each sample 120 min when the loading conditions shown in Table 4.

Antifriction properties were characterized by the maximum value of the CoE is ficient friction (f max) for each variant of lubricant additives.

Screening (anti-wear) properties were determined by the diameter of the spot of wear (contact) "d" in mm

As can be seen from table 5, the use of the claimed supplements (FCG) can improve friction properties, reducing the coefficient of friction to 0.19-0,32 (examples 2-4) compared to the prototype (FC-1) - 0,38 (example 1), as well as to improve the shielding properties (anti-wear) properties of the additive, reducing the diameter of the spot of wear to 0.20-0.40 mm (examples 2-4) compared to the prototype (FC-1) at 0.42 mm (example 1).

The reduction of the tar content in the recipe below 10% leads to a reduction in anti-friction and screening (anti-wear) properties of the additive FCG to the level of a prototype - additive FC-1.

The increase in the content of tar in the recipe more than 30% does not increase friction and screening (anti-wear) properties of the claimed supplements FCG and is impractical.

Thus, the use of the proposed lubricant additives (FCG) allows you to:

- exclude the use of edible vegetable oils in the lubricating composition additive;

to increase friction and screening (anti-wear properties of lubricating additives under high loads;

to obtain an effective lubricant additive, using waste oil industry.

Table 1
The lubricant additives
Name of the componentThe additives, %
1 (prototype) FK-12 FCG3 FCG4 FCG
Sunflower oil30---
Phosphatidy concentrate, isolated from sunflower oil70708090
The residue from the distillation of fatty acids isolated from soap stock light vegetable oils-302010

Table 2
Components of lubricating additives
Name of the componentThe composition of the components, %
Triglycer the water PhospholipidsFree fatty acidsPolymerizate fatty acidsWater
Sunflower oil95-5--
Phosphatidy concentrate305510-5
Tar40-5010-

Table 4
The mode of loading sample
Exercise time, min10101010101010101010 1010
Load (kg)10203040

Table 5
The results of the test lubricant additives
No. sampleThe lubricant additives, %Coefficient of friction (f max)The diameter of the spot of wear (d)mm
1 Prototype (FC-1)Sunflower
oil - 30%0,380,42
FC - 70%
2(FCG)FC - 70%0,320,20
Tar - 30%
3(FCG)FC - 80%0,260,34
Tar - 20%
4(FCG)FC - 90%0,190,40
Tar - 10%

Lubricating additive to drilling mud, comprising phosphatidyl concentrate, isolated from sunflower oil, wherein the lubricating additive further comprises a residue from the distillation of fatty acids isolated from soap stock light vegetable oils, in the following ratio, wt.%:

Phosphatidy concentrate, isolated from sunflower
oil70-90
The residue from the distillation of fatty
acids isolated from soap stock
light raises the selected oils 30-10



 

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