RU2271378C2 - Multiple-purpose reagent for process liquids used in boring operation and in pullout of holes - Google Patents

Abstract

FIELD: lubricants and boring engineering.

SUBSTANCE: multiple-purpose reagent containing lubrication-and-stabilization component (70-80%) and solvent (20-30%) contains, as said lubrication-and-stabilization component, oxidized mixture of paraffins, naphthenic and aromatic hydrocarbons at ratio 2:3:4, and, as said solvent, diesel fuel or kerosene.

EFFECT: improved lubrication properties of viscous-plastic drilling fluids and stabilized inverted emulsions used in boring operation and in pullout of hole.

2 cl, 2 tbl, 6 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 reverse 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 the reagent for drilling fluids "SMAD-1", which is a 50% solution of oxidized petrolatum in diesel fuel / V.I. Tolkunov, I. B. Heifits. Hydrophobic emulsion solutions. 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) the heterogeneity of the composition associated with the low selectivity of 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 the manufactured batches of “SMAD-1”.

The technical result of the invention is the improvement of the lubricating properties of viscoplastic washing fluids and the stabilization of invert emulsions used in drilling and well repair.

The complex action reagent for process fluids used in drilling and workover, containing a lubricating stabilizing component and a solvent, contains a oxidized mixture of paraffins, naphthenic and aromatic hydrocarbons in a ratio of 2: 3: 4, respectively, in the following ratio of components, as a lubricating stabilizing component , wt%: the specified mixture of paraffins, naphthenic and aromatic hydrocarbons 70.0 - 80.0, solvent 20.0 - 30.0.

 As a solvent, said reagent contains 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 ° C and stirring for 0.5-1 hours

The content of the oxidized mixture of paraffins, naphthenic and aromatic hydrocarbons in a ratio of 2: 3: 4, respectively (GOST 10585-99) in kerosene or diesel fuel is selected in the range of 70.0-80.0% wt. When their content in the solution is above 80%, the pour point of the proposed reagent increases, which creates technological difficulties associated with the need to heat the reagent. The use of a reagent with a concentration of an oxidized mixture of paraffins, naphthenic and aromatic hydrocarbons in a ratio of 2: 3: 4, respectively (GOST 10585-99) below 48% is not rational, as expenditure rates and transportation costs increase.

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

As the ingredients used

- kerosene (TU 38.601-22-70-97);

- diesel fuel (GOST 305-82);

- an oxidized mixture of paraffins, naphthenic and aromatic hydrocarbons in a ratio of 2: 3: 4, respectively (GOST 10585-99).

Performance indicators of the proposed reagent are presented in table.2.

Reagent Production Examples

Example 1

To 20% wt. kerosene was added at 75 ° C 80% wt. an oxidized mixture of paraffins, naphthenic and aromatic hydrocarbons in a ratio of 2: 3: 4, respectively (GOST 10585-99) (acid number 24) and stirred for 0.5-1 hours. After cooling, a reagent was obtained, which is a dark cinnamon liquid , T _fast = -18 ° C, electrical stability of the invert emulsion = 400 V, viscosity = 30.

Example 2

To 20% wt. diesel fuel was added at 75 ° C. 80% wt. an oxidized mixture of paraffins, naphthenic and aromatic hydrocarbons in a ratio of 2: 3: 4, respectively (GOST 10585-99) (acid number 24) and stirred for 0.5-1 hours. After cooling, a dark brown liquid reagent was obtained , T _fast = -15 ° C, electrical stability of the invert emulsion = 380 V, viscosity = 32.

Example 3

To 20% wt. kerosene was added at 65 ° C 80% wt. an oxidized mixture of paraffins, naphthenic and aromatic hydrocarbons in a ratio of 2: 3: 4, respectively (GOST 10585-99) (acid number 20) and stirred for 1 hour. After cooling, a reagent, which is a dark brown liquid, T _st = -16 ° C, electrical stability of the invert emulsion = 350 V, viscosity = 31.

Example 4

To 20% wt. kerosene was added at 85 ° C 70% wt. an oxidized mixture of paraffins, naphthenic and aromatic hydrocarbons in a ratio of 2: 3: 4, respectively (GOST 10585-99) (acid number 21) and stirred for 0.5-2 hours. After cooling, a reagent representing a dark brown liquid was obtained , T _fast = -20 ° C, electrical stability of the invert emulsion = 360 V, viscosity = 29.

Example 5

When drilling SCR 215 of the Odoptu-Sea field in an invert emulsion drilling fluid containing (in wt.%) Okhta oil 14, an aqueous solution of calcium chloride 38.8, diesel fuel 22.7, SMAD-1 2.8, Emultal 1, 6, lime 0.8, barite weight 11.1, organobentonite 0.8, due to the accumulation of the solution with a colloidal fraction of cuttings in an amount of 7.4% at a depth of 1660 m, the electrostability of the solution decreased from 180 V to 120 V. the drilling speed of the well decreased from 23 to 13 m / h without any changes in the drilling mode.

After processing this drilling fluid directly during drilling with the proposed reagent, obtained according to example 1, through an ejector at the suction line of the pump in an amount of 0.5%, the electrical stability of the solution after two washing cycles increased to 170 V, and the mechanical drilling speed increased to 11.5 m / hour.

For a similar treatment of the solution in order to restore its electrical stability at well No. 118 where the SMAD-1 reagent was used, 1% of this reagent was required.

Example 6

When posting a plot of zenith angle set with an intensity of 1.8 deg / 10 m at a current angle of 47 degrees at a depth of 1711 m, the drill string was planted. The study of the interval did not give a lasting effect. For drilling, a viscoplastic polymer clay solution with a density of 1.17 g / cm ³ based on PMBV grade bentonite treated with 1% Na ₂ CO ₃ , 0.5% KMTS-500 carboxymethyl cellulose and 10% glycoil was used. The stickiness coefficient of the crust of this solution was 0.23. Processing samples of this solution with the proposed reagent in an amount of 1% showed a decrease in the stickiness coefficient of the crust to 0.11. After a similar treatment of the same solution in the well, the drill string tightening stopped, which allowed us to gain the required zenith angle of 86 degrees.

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

1. High performance characteristics: low pour point (no more than -10 ° С) and filtration rate, high structural-mechanical, tribotechnical and stabilizing properties (electrical stability more than 330 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 cheap and affordable raw materials, industrial production of which is established in the Russian Federation.

4. Large quantitative yield of the target product and the absence of production waste.

5. The ability to control the acid number of the target product.

6. One-stage receipt.

The proposed reagent is designed to stabilize hydrophobic-emulsion solutions, as well as to increase the lubricity of viscoplastic flushing fluids used in drilling and well repair.

2004116722/03

Table 1 Name of indicator Value Control method 1. Appearance Dark brown to black oily viscous liquid Visually in transmitted light 2. Acid number, mg KOH / g, not less twenty According to GOST 22386 3. Viscosity at 50 ° C, conventional degrees of oil, not more than 32 According to GOST 6258 4. Pour point, ° С, not higher -10 According to GOST 20287

table 2 Name of indicator Value Control method 1. The electrical stability of the invert emulsion > 330 According to TU 2458-001-50780546-2001 2. The filtration rate, cm ^3/30 min, no more than four "-" 3. The static shear stress of the clay solution after 1 and 10 min of rest, Pa, not more 1.2-2.0 "-" 4. The wear rate of the steel rod in a clay solution containing the additive of the proposed reagent, mm / min, not more 0.31 "-"

Claims (2)

1. The reagent complex action for process fluids used in drilling and workover, containing a lubricating stabilizing component and a solvent, characterized in that as a lubricating stabilizing component it contains an oxidized mixture of paraffins, naphthenic and aromatic hydrocarbons in a ratio of 2: 3 : 4, respectively, in the following ratio of components, wt.%: The specified paraffin mixture,  naphthenic and aromatic hydrocarbons                                         70.0 - 80.0 Solvent                                                      20.0 - 30.0 2. The reagent according to claim 1, characterized in that it contains diesel fuel or kerosene as a solvent.