Biodegradable additive concentrate improving the lubricity of aqueous sludges, use thereof and aqueous sludge for drilling

Abstract

Biodegradable additive concentrate with pour point according to standard ASTM D 97 below −5° C., improving the lubricity of water-based muds, comprising at least one compound selected from the group consisting of: the diglycerol mono- and diesters, the acids and the ester derivatives of monocarboxylic fatty acids comprising from 16 to 22 carbon atoms per chain, the acids and the ester derivatives of resin acids, the monoesters of polyol comprising more than 4 hydroxylated groups and of carboxylic fatty acids comprising from 6 to 12 carbon atoms, saturated and unsaturated by at least one unsaturation, and the mono- and polyalkoxylated esters of saturated and unsaturated dicarboxylic acids comprising from 6 to 12 carbon atoms. The use of this concentrate in a water-based mud and the water-based mud containing said concentrate that can be used for drilling.

Claims

1. Biodegradable additive concentrate with a pour point according to standard ASTM D97 below −5° C., which improves the lubricity of water-based muds, characterized in that it comprises at least one compound selected from the group consisting of: the diglycerol mono- and diesters, the acids and the ester derivatives of monocarboxylic fatty acids comprising 16 to 22 carbon atoms per chain, and the acids and the ester derivatives of resin acids, mixed with at least one compound with solvation properties selected from the group consisting of: the monoesters of polyol comprising more than 4 hydroxylated groups and of carboxylic fatty acids comprising from 6 to 12 carbon atoms, saturated and unsaturated by at least one unsaturation, the mono- and polyalkoxylated esters of saturated and unsaturated dicarboxylic acids comprising from 6 to 12 carbon atoms, and a mixture thereof.

2. Concentrate according to claim 1, in which the diglycerol monoesters and diesters are added together to said concentrate, the diglycerol monoester content varying from 30 to 60% by weight of the mixture and the diglycerol diester content varying from 40 to 70% by weight of the mixture, the ester group being obtained from at least one saturated and/or unsaturated linear fatty acid comprising from 16 to 22 carbon atoms.

3. Biodegradable concentrate according to claim 1 comprising up to 50% by weight of at least one acid or ester derivative of linear monocarboxylic fatty acids comprising from 16 to 22 carbon atoms optionally mixed with at least one resin acid selected from the group of abietic acid and derivatives thereof.

4. Concentrate according to claim 1 comprising from 50 to 99% by weight of at least one compound with solvation properties selected from the monoesters of polyol comprising from 5 to 10 hydroxylated groups and of carboxylic fatty acids comprising from 6 to 12 carbon atoms, saturated and unsaturated by at least one unsaturation, or also from the polyethoxylated esters of linear dicarboxylated acids.

5. Concentrate according to claim 1, characterized in that it comprises from 50 to 100% by weight of the diglycerol mono- and diester mixture and from 0 to 50% of at least one acid or linear monocarboxylic fatty acid ester derivative comprising from 16 to 22 carbon atoms, optionally mixed with at least one resin acid selected from the group of abietic acid and ester derivatives thereof.

6. Concentrate according to claim 1, characterized in that it comprises from 1 to 50% by weight of at least one acid or linear monocarboxylic fatty acid ester derivative comprising from 16 to 22 carbon atoms optionally mixed with at least one resin acid and/or an ester derivative of said acid selected from the group of abietic acid and derivatives thereof, and from 50 to 99% by weight of at least one compound with solvation properties selected from the monoesters of polyol comprising from 5 to 10 hydroxylated groups and of carboxylic fatty acids comprising from 6 to 12 carbon atoms, saturated and unsaturated by at least one unsaturation, or also from the polyethoxylated esters of linear dicarboxylated acids.

7. Concentrate according to claim 6, characterized in that the compound with solvation properties is sorbitan laurate.

8. Concentrate according to claim 1, characterized in that it comprises a mixture of acids or of esters obtained from a composition mainly constituted by a mixture of linear C16 to C22 monocarboxylic fatty acids, optionally mixed with at least one resin acid.

9. Concentrate according to claim 8, characterized in that the composition mainly constituted by a mixture of fatty acids is of natural origin, i.e. of vegetable and/or animal origin.

10. Concentrate according to claim 8, characterized in that the composition mainly constituted by a mixture of fatty acids comprises up to 40% by weight of the composition of resin acids and preferably less than 5% by weight of resin acids.

11. Use of the additive concentrate according to claim 1 in a water-based mud comprising up to a content of 10,000 ppm by weight of said additive concentrate in the water in order to improve the lubricity of said water-based mud.

12. Use according to claim 11, characterized in that the additive concentrate content varies from 200 to 5000 ppm by weight relative to the water of said mud.

13. Water-based mud comprising 200 to 5000 ppm by weight of additive concentrate according to claim 1 in the presence of compounds capable of adjusting the pH and density of the mud envisaged, in particular in combination with functional additives suitable for the type of application of the mud.

Description

EXAMPLE 1

(1) The present example aims to describe the various additive concentrates according to the invention and the water-based muds that it is possible to prepare from them.

(2) The additive concentrates will be referenced Ci and the muds according to the invention Bi: they are presented in the following Tables I and II, respectively.

(3) TABLE-US-00001 TABLE I Ester of glycerol Diglycerol and of Sorbitan Nycobase esters PC32 PC32 laurate 618 (% by (% by (% by (% by (% by weight) weight) weight) weight) weight) C1 100 C2 100 C3 50 50 C4 100 C5 50 50 C6 1 99 C7 10 90 C8 1 99 C9 10 90 C10 50 50 C11 1 99 C12 10 90

(4) The water-based muds prepared from the additive concentrates in Table I are shown in Table II. For each of the muds, the wear diameter was measured by an HFRR method derived from ISO 12156-1. This wear diameter is supplemented with a measurement of coefficient of friction.

(5) TABLE-US-00002 TABLE II Content of Additive concentrate Wear diameter Coefficient of Mud concentrate (ppm by mass) (microns) friction B0 — — 458 0.419 B1 C1 200 239 0.186 B2 C1 500 207 0.177 B3 C1 10000 178 0.123 B4 C2 200 344 0.210 B5 C2 500 260 0.190 B6 C2 10000 210 0.185 B7 C3 200 180 0.064 B8 C3 10000 130 0.051 B8 C4 200 194 0.164 B9 C4 500 174 0.132 B10 C4 10000 131 0.102 B11 C5 200 260 0.218 B12 C5 10000 174 0.073 B13 C6 200 352 0.284 B14 C6 10000 188 0.182 B15 C7 200 387 0.286 B16 C7 500 230 0.237 B17 C7 10000 177 0.148 B18 C8 200 453 0.258 B19 C8 500 245 0.264 B20 C8 10000 190 0.185 B21 C9 200 379 0.287 B22 C9 500 250 0.255 B23 C9 10000 213 0.179 B24 C10 200 237 0.215 B25 C10 500 224 0.197 B26 C10 10000 163 0.139 B27 C11 200 180 0.064 B28 C12 200 352 0.261 B29 C12 500 234 0.245 B30 C12 10000 175 0.182

(6) It can be seen from Table II that the use of the additive concentrate makes it possible to reduce the coefficient of friction. In fact, the coefficient of friction obtained for the additives according to the invention is always less than 0.419, which is the reference value for mud B0. When the additive concentrate in the water reaches 500 ppm by weight, the lubricity of the fluid is improved significantly, which is reflected in a reduction in the wear diameter and coefficient of friction.

EXAMPLE 2

(7) This example aims to compare the performance of the water-based muds according to the invention in terms of improvement of the lubricity of these muds by HFRR measurement and determination of the coefficient of friction relative to the performance of a commercially available “Radiagreen EME salt” additive. The results are presented in Table III

(8) TABLE-US-00003 TABLE III Concentrate Wear Additive content (ppm diameter Coefficient of Mud concentrate by weight) Salinity (microns) friction B′0 — — — B′1 C1 10000 — 178 0.123 B′2 C4 10000 — 131 0.102 B′3 Radiagreen 10000 — 157 0.139 EME Salt B′4 — — TH30.sup.1 610 0.387 B′5 C1 200 TH30 627 — B′6 C1 10000 TH30 223 0.129 B′7 C4 200 TH30 442 — B′8 C4 500 TH30 200 — B′9 C4 10000 TH30 158 0.102 B′10 C5 200 TH30 492 — B′11 C5 500 TH30 195 — B′12 C5 10000 TH30 151 0.119 B′13 C10 200 TH30 477 — B′14 C10 500 TH30 181 — B′15 C10 10000 TH30 140 0.125 B′16 Radiagreen 200 TH30 204 — EME Salt B′17 Radiagreen 500 TH30 190 — EME Salt B′18 Radiagreen 10000 TH30 160 0.120 EME Salt Corresponds to a CaCl.sub.2 content of 0.333 g/L

(9) The wear results obtained with the additive concentrates according to the invention demonstrate performance similar to the commercial additives starting from 500 ppm by weight.