SU1126590A1 - Additive for clay drilling muds - Google Patents

Abstract

The use of waste paper and pulp industry at the stage of processing raw sulphate soap for phytosterol (PPF) as a lubricant and fixing additive to clay drilling fluids. (L I4D CLE; o

Description

 one . The invention relates to the drilling of wells, in particular to compositions of g of drilling fluids with improved lubricating and holding properties. The use of crude oil as a lubricant additive to drilling mud solutions is known. However, crude oil is deficient, flammable, and its additive is multi-toned; In addition, crude oil makes wear of rubber elements of drilling equipment due to the presence of gasoline fractions in its composition and in most cases requires the joint introduction of special emulsifiers, which complicates the processing process and increases the cost of drilling mud. In addition, the use of oil is limited by its negative impact on the environment. Closest to the proposed technical solution is the use of a crude sulphate meat 2j as a lubricant additive. The disadvantages of this lubricant are low lubricating and fixing properties, foaming of the solutions, as well as harmful effects on the health of the staff, due to the presence of bluish sulphurous compounds in the sulphate soap. The purpose of the invention is to improve the lubricating and holding properties of clay drilling fluids. This goal is achieved by using pulp and paper waste as a lubricating and fixing additive and clay drilling mud at the stage of processing raw sulphate soap for phytosterol (PPF). PPF is a homogeneous, easily mobile fluid (viscosity 85 at) brown, without a groin, having the following composition, May. %: Sodium salts of fatty acids 10-22 Sodium salts of resin acids 10-12 Non-washable substances (aliphatic C alcohol (4, hydrocarbons); 1-3 Ethyl alcohol 2-10 Water Total 02 PPF is developed in a new way, which involves the dissolution crude sulphate soap in ethyl alcohol at a ratio of 1: (1.52, 5) and at 50-55 C. After stirring and subsequent settling at the same temperature, the solution is separated from the shaft, diluted with water to an alcohol concentration of 55-60% and produce phytosterol crystallization by lowering the temperature to and 72 hours. The precipitated phytosterol crystals are separated together with other products of the naberable fraction, for example, aliphatic alcohols and hydrocarbons.Alcohol is distilled from the remaining solution to its concentration in PPP 2-10% .The yield of PPF per day is about 700 kg. In order to evaluate the effectiveness of PPF as an additive to drilling fluids, the properties of drilling fluids treated, respectively, Sh1F, sulfanol, and crude sulfate were studied in laboratory conditions. As a result of the research conducted, it was established (Table 1) that the PPF has the best ability, as a stabilizer, to reduce the water loss of the iio drilling mud compared with sulfanol and sulfate soap. An increase in the PPF content of 1.0 wt.% Has practically no effect on its stabilizing ability. In the process of drilling, and at. firing operations, the force of friction and adhesion prevent free movement of the drill string relative to the borehole wall with a filtercake formed on its surface. A stop of a drill string without movement is often accompanied by its sticking to the well wall - sticking. The effectiveness of subsequent anti-seize measures depends on the stability of the rocks in the near-wellbore zone of the well. Collapse} breeds usually ends with the elimination of the trunk of a well, gin. In accordance with this, the study of the adhesion and frictional properties of drilled solutions was carried out on a PT-2 device, which allows us to estimate the total force required to shift the metal disk that simulates the surface of the drill pipe relative to the mudcake that is in direct contact with it and formed similar to its formation on the borehole wall by filtering the drilling fluid through a porous medium. The force is the sum of the adhesive forces and; friction force, determined by the value of the ultimate static shear stress of the mudcake - Pj (Pa). The dependence of P on concentration was studied. additives to the clay compositions of sulfanol, sulfate soap and PPF, as a result of which it was established that the minimum values of P are provided with the addition of PPF in the amount of 1.5 wt. % . The effect of sulfanol, sulfate soap, and PPP on the magnitude P of filtration crusts of drilling fluids, stabilized by the UShR, CSSC, and CMC, is shown in Table. 2. The data of this table indicate that PPF most effectively reduces the PI value {compatible with various reagents of stabilizers. Since there is a close relationship between the energy of the adhesion interaction of the contacting surfaces and the surface tension, the decrease in the surface tension of the mud filtrate from the amount of PPF additives was studied (Table. From Table 3 it follows that the PPF more effectively reduces the surface tension of the filtrate, and the optimum its additives should be considered 0.7–1.0 wt.%, as with a PPF content less than 0.7 wt.%, the surface tension increases, and with an increase in the content above 1.0 wt.%, it practically does not change. Shout sludge drilling, sulfate soaps and PPF drilling resistors on the stability of rocks in the borehole walls were estimated by the coefficient yci of the stability of Cc samples of these rocks (in particular, samples from hydromica clay) in the medium of the indicated solutions under uniaxial compression. ky values correspond to a 03PH solution with the addition of PPF in an amount of more than 0 75 weight. The stability of clay samples in this solution increases 2 times, and in solution with the addition of sulfate soap - 1.5 times compared to the outcome ny & Thus, the addition of PPF in the amount of 0.7-1.5 wt.% Contributes to a better stabilization of drilling fluids, more effectively reduces the surface tension of the mud filtrate and the limiting static shear stress of the mud cake, increases the coefficient of stability of the GLY.TYh samples by 2 times . In addition, the presence of alcohol in the soil of PPF reduces the foaming in the drilling fluid, which partially forms the foam self-extinguishes s for a few minutes. Similar additions of sulfanol and sulfate soap require the combined use of antifoam agent, for example, MAS-200 (Table 1). Field tests showed that due to the lubricating and anti-wear properties of the drilling solution, the working conditions of the rock cutting tool are improved. An increase in the mechanical drilling rate is achieved by the interaction of the lubricant with the metal at high contact pressure and temperature (Table 4). Comparison of the effectiveness of lubricant additives during field drilling is presented in table 4. Table 1

Bentonite 8 Water 92

A solution of 1 + 0.4% sulfate soap + 0.12% MAC - 200 (defoamer)

1.06

13.5

3.0 7.85

40.5

sixteen

1, 06

24.5

2.0 8.3.5

Solution

I 3

A solution of 1 + 0.4% sulfanol + 0.12% MAS-200

4 Solution 1 + 0.2% PPF

5 Mortar.1 + 0.40 PPF

6 Solution 1 + 0.6% PPF

7 Solution 1 + 0.80 PPF

8 Solution 1 + 1.0% PPF

9 Solution 1 + 1.3% PPF 15.0 13 Bentonite 10 CShR-4. 2 Solution 1 + 0, U 12.0 sulfanol

A solution of 1 + 0.3% sulfanol 8.5

A solution of 1 + 0.5% sulfanol 8.0

A solution of 1 + 0.1% sulfate mass 13.0

Continuation of table 1

1.06

sixteen

21.5 2.0 8.21

26.5 2.0 9.05

sixteen

15.7 20.0 2.0 9.40

15.8 19.5 2.0 9.46

16.0 18.0 2.0 9.50

16.1 16.5 2.0 9.52

16.3 16.5 2.0 9.54

Table 2 14

15 Solution 11 + 0.1%

PPF10

16 Solution 11 + 0.3%

PPF6.5

17 Solution 11 + 0.5% PPF Solution 11 + 0.3% sulphate soap 10.5 Solution 11 + 0.5% sulphate soap 6.5

A solution of 1 + 0.3% sulfate soap 11 5

A solution of 1 + 0.5% sulfate soap 7.0 8 Solution. 1 + 0, 11.0. . PPF

Solution 1 + 0.3%

PPF

Solution 1 + 0.5%

5.0 22 PPF

Continuation of table 2

18 Bentonite 10 CMC-600 1.5

B (5 da 88,5

12

19 Solution 18 + 0.1%

10 sulphate soap 20

21

Solution 18 + 0.5%

7.0 sulphate soap

Solution 18 + 0.1% PPF Solution 18 + 0.3% sulfate soap 8.5 1.14 16 Sulfate soap 1.5% 1.14 17 1.08 17 Liquidated due at 815 Sulfate soap 1.5% 1.10 18 27 2 454 1tF-1.3 22 2 1.10 18 1.5% 12/16 186-X 0.88 300. 170 53/60 300 X 1.09 6/12 80- USH 1.02 200 hand tools 8032/54 200 USH 1.28 2028/52 349 USH 1.34