SU812823A1 - Drilling mud - Google Patents

Description

. The invention relates to drilling (oil and gas wells in the North).

Muds are known in which a used antifreeze kachostve ⁵ are various organic and inorganic substances, in particular known drilling mud, water-based, wherein the required components are heteropolysaccharide formed as a result of bacteria of the genus Xanthomonas and oxidized hydrocarbon dispersant which can be represented by polyhydric alcohol, for example, this Yaengliksglem. Ethylene glycol promotes the dispersion of the heteropolysaccharide in the aquatic environment and acts as a freezing point reducer for the drilling fluid 20. The freezing temperature of this solution is only (-2) - (~ 3) ° C. However, due to the fact that the minimum temperature of permafrost rocks is -10 ° С, there is a need for developing drilling fluids that are not freezing at this temperature [I].

However, the use of ethylene glycol and other organic antifreezes (dy-30 ethylene glycol, xylitane, methanol, etc.) to reduce the freezing temperature to -10 ° C is difficult due to their high cost and scarcity, as well as the need to create large concentrations in solution.

Known drilling fluid, freezing to -10 ° C, containing inorganic salt as antifreeze. This solution is a clay suspension, an aqueous phase, which is mineralized with sodium chloride [2].

The disadvantage of this solution is the difficulty of regulating its technological parameters. The introduction of large amounts of inorganic antifreeze NaCI into a clay suspension sharply worsens the structural-mechanical and filtration properties of the solution, which leads to the need for its processing by a system of reagents-regulators of properties. To reduce filtration, a significant consumption of the KMC-600 stabilizer (2%) is required.

The purpose of the invention is to improve the quality of the solution by increasing the stability of its properties in the temperature range of 10-20 ° C.

This goal is achieved in that as an antifreeze solution contains sodium acetate in the following ratio of components, wt.%:

Bentonite clay 5-6

Carboxymethyl cellulose-600

Sodium Acetate

Water.

1-1,2

16-17 The rest.

To improve lubricating properties, the solution can be treated with oil in combination with a non-ionic emulsifier op-y.

As antifreeze in drilling fluids, waste from the production of polyvinyl alcohol can be used, | _with up to 70% sodium acetate. Their consumption to reduce the freezing temperature to ~ 10 ° C is 25%.

Example. Drilling fluid is prepared as follows. A homogeneous suspension is prepared from the calculated quantities of water and the Sarigyukh bento * 0 nit (bentonite clay), which is then treated with stirring with the required amount of CMC-600 in dry form (or in the form of a 10% solution). In 25 stabilized clay suspension, the calculated amount of antifreeze is introduced; the reagent is added gradually; after entering each portion, the solution is stirred until complete dissolution. Reagents manufactured by industry are used to prepare the solution.

To measure technological parameters, standard instruments 35 and techniques are used. Cooling solutions to -10 ° C is carried out in a special climatological cabinet type 3001.

Before measurement, the solution and instruments are placed in a cabinet and thermostated at a given temperature for several hours.

Upon cooling to -10 ° С, the structural-mechanical parameters of solutions slightly increase, and the filtration decreases:. At the same time, all the properties of the solutions are within the specified limits. When /, cooling and heating, the solutions do not undergo irreversible changes.

Studies show that when sodium acetate is used as an antifreeze, the consumption of KMC-600 stabilizer is almost halved, the use of viscosity reducers is not required, the bone is not treated with alkali, since sodium acetate, being a weak acid salt, is hydrolyzed in the solution , increasing the pH to optimal values (9.0-9.5) ./ The proposed solution has satisfactory technological parameters in a wide temperature range, is easy to prepare, consists of a minimum number of inexpensive and non-deficient components, which greatly facilitates its use when drilling wells in the North.

Claims (2)

. The invention relates to the drilling of oil and gas wells in the North. There are known clay solutions in which various organic and inorganic substances are used as antifreeze, c. In particular, a water-based drilling mud is known, in which the necessary components include a heteropolysaccharide formed as a result of the activity of the Xanthomonas bacteria and an oxidized carbohydrate dispersing agent, which can be represented by a polyhydric alcohol, for example, these. Ethylene glycol contributes to the dispersion of the heteropolysaccharide in an aqueous medium and acts as a low temperature freezing agent, a drilling mud. The freezing point of this solution is only (-2) - (-3) ° C. However, in connection with the fact that the temperature of multi-frozen rocks of -10 ° C is minimal, it becomes necessary to develop drilling solutions that are not freezing at this temperature l. However, the use of ethylene glycol and other organic antifreezes (e-ethylene glycol, xylitane, methanol, etc.) to lower the freezing temperature to –10 ° C is difficult because of. their high cost and scarcity, as well as the need to create large concentrations in the solution. Known drilling fluid, non-freezing, containing as an antifreeze inorganic salt. This solution is a clay slurry, the aqueous phase of which is mineralized with sodium chloride izj. The disadvantage of this solution is the difficulty of adjusting its process parameters. The introduction of large amounts of inorganic antifreeze NaCI into the clay suspension dramatically impairs the structural, mechanical and filter properties of the solution, which leads to the need for treatment with a system of reagents-regulators of properties. To reduce filtration, a significant consumption of the CMC-BPO stabilizer is required (2%). The purpose of the invention is to improve the quality of the solution by increasing the stability of its properties in the temperature range of 10-20 ° C. This goal is achieved by the fact that as an antifreeze solution contains acetate sodium at the following ratio of Components, wt.%: Clay bentonite 5-6 Carboxymethylcellulose. Luloea-BOO1-1,2 Sodium acetate 16-17 Water. Others. To improve the lubricating properties, the solvent can be Oil-treated in combination with the non-ionic emulsifier OP-10. Waste may be used as antifreeze in drilling fluids; polyvinyl alcohol production, content up to 70% sodium acetate. Their flow to lower the freezing point to -H is 25%. Example. The drilling fluid x-off is as follows. From the calculated amounts of water and sarigyuh-bentonite (bentonite clay), a homogeneous suspension is prepared, which is then treated with the necessary amount of CMC-BOO in dry form (or as a solution) with stirring. A calculated amount of antifreeze is introduced into the stabilized clay slurry; the reagent is added gradually; after the introduction of each portion, the solution is stirred until the salt is completely dissolved. Reagents from industry are used to prepare the solution. Standard instruments and methods are used to measure technological parameters. Cooling solutions up to. -10 ° C is produced in a special climatological cabinet type 3001. Before measuring, the solution and instruments are placed in the cabinet and thermostatically controlled at a given temperature for several hours. When cooled to -10 ° C, the structural mechanical parameters of the solutions slightly increase, and the filtration decreases. At the same time, all properties of the solutions remain within the specified limits. When chilling and heating solutions do not undergo Irreversible changes. Studies show that when sodium acetate antifreeze is used, the consumption of the CMC-BPO stabilizer is almost halved, the use of scavengers in g- is not required, the bones exclude treatment of the mud with the alkali, as sodium acetate, being a salt of a weak acid, hydrolyzes in the solution , raising the pH to the optimal values (9.0-9.5) .; The proposed solution has satisfactory technological parameters in a wide range of temperatures, is characterized by ease of preparation, consists of a minimum number of inexpensive and non-deficient components, which greatly facilitates its use in drilling wells in the North. Claim 1. Bore mud containing bentonite clay, carboxymethylcellulose-600, antifreeze and water, o. It is distinguished by the fact that, with the aim of improving the quality of the solution by increasing the stability of its properties in the temperature range -1020 °, as an antifreeze solution contains sodium acetate in the following ratio of ingredients, weight. %: Bentonite Clay 5-6 Carboxymethylcellulose-6001-1, 2 Sodium acetate 16-17 Water Else. . 2. A solution according to claim 1, characterized in that, as an antifreeze, the solution contains polyvinyl alcohol production wastes containing up to 70% sodium acetate. 3. The solution according to claim 1, from l and h ayusch and with the fact that, With the goal of obespe-. chenii lubricating properties, the solution contains oil and OP-10. . Information sources information taken into account during the examination 1. US Patent No. 3633689, CL; 175-65, published. 1972: 2. Zhukhovitsk-s S.Yu. Wash fluids in drilling. M., Nedra, 1976., P.82.