SU956538A1 - Process for producing reagent for treating drilling muds - Google Patents

Description

The invention relates to the drilling of oil and gas wells, in particular, to the technology of preparation of drilling fluids.

Methods are known for preparing reagents for drilling fluids based on polyacrylamide and polyacrylonitrile by alkaline hydrolysis at a temperature close to boiling.,

However, to obtain these reagents, scarce and expensive raw materials (nitrile of acrylic acid, polyacrylamide) are used, which makes drilling mud more expensive.

  There is also known a method for preparing a stabilizing agent for drilling fluids based on acrylic polymer - wet waste fiber nitrone, which is a ternary copolymer of nitrilacrylic acid and methyl acrylic ester. In this method, the reagent is prepared as follows. In 1 liter of water, 40 g of sodium hydroxide is charged and 200 g of waste is charged. The mixture is boiled for 1.5-2 hours. The prepared polymer reagent is a homogeneous liquid 2.

The disadvantages of the reagent obtained by this method are its low stabilizing and inhibiting properties under conditions of elevated temperatures and mineralization, which is expressed by a sharp increase in fluid loss of the drilling fluid.

The purpose of the invention is to increase the stabilizing and inhibiting properties of the reagent under conditions of higher temperatures and mineralization.

The goal is achieved by

10 that, according to the method of preparing a reagent for drilling fluids, after 2.5 h from the start of hydrolysis, heating of the reaction mixture is stopped and neutralized with sulfuric acid and sodium bichromate or potassium bichromate in a quantity of 1.3 wt.% And 1-4 wt. % by weight of the mixture, respectively, with stirring for at least 45-65 minutes

20

As acrylic polymer, powdered polyacrylonitrile, waste fabrics from fiber nitrone or fibers from fiber 25 nitron l can be used.

The proposed reagent is a homogeneous product of a light brown color with an ammonic odor. with density p1,04,0,06 g / cm3, water-h

30 cottages 2-4 cm in 30 minutes.

The complete dissolution of the pore of acyclic polyacrylonitrile and nitro fiber yarns occurs at a temperature of 85-100 ° C for 2-2.5 hours. Tissue waste from the fiber nitron dissolves within 4 hours. An increase in the heating time of the polymer mixture with alkali does not affect the change in the properties of the reagent.

With an increase in tissue waste content of over 15%, a pasty consistency agent is formed, which is not removed from the cutter container.

The intensity of movement of the reaction mixture does not have a significant effect on the quality of the reagent.

Table 1 lists the compositions of the studied reagents based on hydrolized tissue waste from fiber from nitron. To prepare composition 1, 50 g of a nitron fiber graft, 450 g of a 7% aqueous solution of alkali are mixed in a conical flask.

Table i

The mixture was incubated in a water bath at 85-100 ° C until the flaps were completely dissolved. Thereafter, the heating is turned off and the reagent is left Yo alone for a day.

When the reagent is neutralized, sulfuric acid is injected after the heating is turned off. Sulfuric acid reagent is stirred for 5

hours Thus obtained compounds 2 - 6.

When processing the reagent with a bottle of liquid, the latter is introduced immediately after the heating is turned off and. the mixture is stirred for 1 hour (formulations, 7-11).

In the preparation of the reagent, we propose the sulfur method immediately after the heating has been extinguished.

after the chromium is injected. Mixing time 1 hour (compounds D2 ..- iSjL

The agglutinosity of the reagent is estimated by its ability to reduce the water yield of a high-energy solution containing 7% bentonite clay base 7% bentonite solution + 20% NaCl + 1.5% CaClQ,. 1.01

solution + 2% 1, (prototype) 1.16

solution + 2% 2

solution + 2% 3

co-solution + 2% 5

solution + 2% 6

solution + 2% 7

solution + 2% 8

solution 4-2% 9

solution + 2% 10

solution + 2% 11

solution + 2% 12

solution + 2%. 13

solution + 2% 14

solution + 2% 15

powder, 20% ratri chloride and calcium chloride (basic solution). The addition of the reagent to the drilling fluid is 2 wt.%, Fl calculated on the dry waste. At the same time, the inhibitory effect of reagents, ta, is evaluated. The results are given by & Table 2 .......

 table 2

22/28 26

956538

Separate treatment of the solution Composition 1 Base solution + 2% of reagent of composition 1+ 0.1% sulfuric acid 1.18 Base solution of reagent of composition I – f. 0.3% sulfuric acid 1.18 64 Base solution + 2.0% reagent of composition 1+ 60 0.6% sulfuric acid 1.18 Base solution + 2.0% reagent composition 1+ G% sulfuric acid - 1.18 62 Basic solution + 2.0% reagent of composition 1+ 56 2% sulfuric acid. 1.18 Base Solution + 2.0% Reagent Composition 1 + 3% Sulfuric Acid 1.1856 Base Solution + 2.0% Reagent Composition 1 + 4% 52 Sulfuric Acid 1.19 Base Solution + 2.0% Composition Reagent 1 + 6% 50 sulfuric acid 1.19 Separated and b Base solution + 2.0% of reagent of composition 1 + 0.1 chromic1.18, 56 Base solution + 2.0% of reagent of composition 1 + 0.3 chrompic1.18 42 Base solution + 2.0% of reagent composition 1 + 0.6 chromic1.18 49 Base solution + 2.0% reagent composition 1 + 1 chromic1.18 33 Base solution + 2.0% reagent composition 1 + 2 chrompic.1, 18 31

8 Continuation of table 2 and sulfuric acid

63 28/36 40 26/38 40 20/32 40 22/36 40 20/42 32 20/42 32 18/38 28 18/38 28 Treatment of the solution with the composition of 1 potassium 26/36: 40 40 19/24 40 40 13/19 40 40, 17/25 25 40 8/14 25 40

Base solution “9p j + 2.0% reagent 1 + 3.0 chrompica Base solution + 2.0% reagent 1 + 4 chrompica

Separate treatment of the solution with composition 1, sulfuric acid and potassium bichromate

Base solution + 2.0% reagent 1 + 0.1 sulfuric acid. + 0.1 chrompeak Base solution + 2.0% reagent: 1 + 0.3% sulfuric acid + 0.3% chrompeak

Base solution + 2.0% reagent 1 + 0.5% sulfuric acid + 0.5% From table 2 it can be seen that when the reagent is neutral with sulfuric acid with a chromium peak, the resistance of the reagent is significantly increased. Thus, when a solution of 2 wt.% Of the reagent neutralized with sulfuric acid with a bichropeak is introduced into a highly mineralized Yurok, the water loss decreases to 4–5 cm –30 min. After thermostating with the iBopa plant at 120 ° C, the water loss is almost not increased. This indicates a high. Salt-resistant. ty chemical reagent. Separating the introduction of sulfuric acid, bromine 1 and chemical prepared by a known method into the drilling mud does not provide low values of the Continuation Table. 2

 34

40

65

38 16/20

69

40

26.5

45 .15 / 19

14/18

40

40

62

16/22

40

40

67 dachk. Water loss is at the same time. S limits Ya6-3.0 min. The reagent prepared by the proposed method has a significantly greater inhibitory effect than the reagent prepared by a known method. This is evidenced by the high stability coefficient of argillite in the model of the filtrate (.79-83%) .- Table 3 presents data showing the influence of the material containing acrylic polymer on the stabilization of the properties of the reagent obtained by its healing hydrolysis. As can be seen from yes: the data listed in Table 3, one can successfully use three different materials as the basis for the preparation of the reagent. ,

th

Breed

polyacrylonitrile: 1.18 68 9/23

Acrylonitrile

Tissue waste

from fiber

 nitron 1.18 62 8/19

Claims (2)

Yarn from fiber Nitron Donetsk worsted combine1,18. 67 11/24 The use of the salt-resistant reagent obtained by the proposed method makes it possible to reduce complexity in deep drilling, to increase the drilling rate and to reduce the cost of drilling mud treatment. According to preliminary estimates, the economic effect is 350 thousand rubles. The invention The method of preparation of the reagent for drilling fluids, including the hydrolysis of acrylic polymer with caustic soda at 85-100 ° C, is distinguished. u and with the fact that, with the aim of higher stabilizing and inhibiting T a b l i. ci i. properties of the reagent under conditions of elevated temperatures and mineralization, through. , 2.5-4 hours from the start of hydrolysis, heating of the reaction mixture is stopped and neutralized with sulfuric acid and sodium bichromate or bichromate. mat porridge in the amount of 1-3 wt.% and 1-4 wt.% by weight of the mixture, respectively, with stirring c. for at least 45-65 minutes Sources of information taken into account in the examination 1. KisterE.G. Chemical treatment of drilling pacTBt5pOB.M., Nedra, 1972, pp. 190-193. . 2. USSR author's certificate No. 663708, cl. C 09 K 7/02, 1975 (prototype K