GB2265646A - True oil drilling liquid - Google Patents
True oil drilling liquid Download PDFInfo
- Publication number
- GB2265646A GB2265646A GB9306665A GB9306665A GB2265646A GB 2265646 A GB2265646 A GB 2265646A GB 9306665 A GB9306665 A GB 9306665A GB 9306665 A GB9306665 A GB 9306665A GB 2265646 A GB2265646 A GB 2265646A
- Authority
- GB
- United Kingdom
- Prior art keywords
- drilling liquid
- carbon atoms
- oil drilling
- alcohol
- true oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/32—Non-aqueous well-drilling compositions, e.g. oil-based
- C09K8/34—Organic liquids
Abstract
True oil drilling liquid essentially comprising an oil phase, wherein the oil phase includes an ester prepared by the esterification of a carboxylic acid or an anhydride, amide or an acid chloride of a carboxylic acid with an alcohol.
Description
TRUE OIL DRILLING LIQUID
The present invention relates to a true oil drilling liquid which essentially comprises an oil phase in which there is no substantial aqueous phase and which does not include an emulsifier.
A true oil drilling liquid differs from an emulsion drilling liquid in that an emulsion drilling liquid has a continuous phase (oil or aqueous) and a dispersed phase (water or oil) emulsified in the continuous phase.
A drilling liquid performs several functions, for example aiding the production of cuttings in a borehole drilled in an underground formation, removing cuttings from the borehole, cleaning the bottom of the borehole, controlling the subsurface pressure, cooling and lubricating the bit, drill pipe and drill collar, and, if the drill bit is actuated by a downhole motor, driving the downhole motor.
As a true oil drilling liquid does not include water, such a drilling liquid is very suitable for drilling through underground formations which are sensitive to water, such as shale or clay layers or salt layers.
Conventional oils for a true oil drilling liquid are hydrocarbon oils such as diesel oil or aromatic-free hydrocarbon oils. Due to environmental restrictions the use of hydrocarbon oils is becoming less attractive.
It is an object of the present invention to provide a true oil drilling liquid which is environmentally more acceptable and which has similar properties as the hydrocarbon oil containing true oil drilling liquid.
To this end the true oil drilling liquid according to the invention essentially comprises an oil phase, wherein the oil phase includes an ester of a carboxylic acid and an alcohol.
The ester can be prepared in a conventional manner, for example by the esterification of a carboxylic acid or an anhydride, amide or an acid chloride of a carboxylic acid with an alcohol.
In an embodiment of the invention the carboxylic acid is a polycarboxylic acid and the moiety to which the carboxyl groups are connected contains between 2 and 26 carbon atoms.
Alternatively the carboxylic acid is a dicarboxylic acid and the moiety to which the carboxyl groups are connected contains between 2 and 10 carbon atoms. Examples of suitable dicarboxylic acids having a saturated group are adipic acid, pimelic acid, suberic acid and azelic acid, and an example of a dicarboxylic acid having an unsaturated group is maleic acid. Suitably the esters made from such a dicarboxylic acid are diesters.
Alternatively the carboxylic acid is a dicarboxylic acid and the moiety to which the carboxyl groups are connected contains between 4 and 26 carbon atoms and wherein the distance between the carboxyl groups is bridged by a chain having between 2 and 10 carbon atoms and suitably between 2 and 5 carbon atoms. An example of such a dicarboxylic acid is an alkenyl succinic acid wherein the alkenyl group contains between 17 and 19 carbon atoms.
In a further alternative embodiment of the invention the carboxylic acid is a monocarboxylic acid and the moiety to which the carboxyl group is connected contains between 1 and 26 carbon atoms. Examples of such carboxylic acids are lauric acid, tetradecanoic acid and pentadecanoic acid.
The moiety to which the carboxyl group(s) is (are) connected can be saturated or unsaturated having up to 3 carbon-carbon double bonds.
The alcohol can be a polyfunctional alcohol containing between 2 and 10 carbon atoms. An example of such an alcohol is trimethylolpropane.
Alternatively the alcohol is a monofunctional alcohol having between 1 and 16 carbon atoms, and more suitably between 1 and 11 carbon atoms. An example is C H2 +1OH, wherein n is between 12 and
n 13.
In a further embodiment of the invention the alcohol is an alkoxylated alcohol comprising an alkyl group of between 1 and 16 carbon atoms and an average number of between 0.5 and 9 alkoxy groups, and more suitably between 3 and 11 carbon atoms and between 0.5 and 9 alkoxy groups. An example of such an alkoxylated alcohol is diethylene glycol monobutyl ether (2-(2-butoxyethoxy)ethanol).
Suitably the alkoxy groups are ethoxy groups, an example of such an alcohol is CnH2n+l-O-(C2H4O)m-H, wherein n is between 12 and 13 and the average of m is 0.8.
Suitably are used esters made from acetic acid and a monofunctional alcohol containing between 10 and 15 carbon atoms and esters from a monocarboxylic acid having between 10 and 15 carbon atoms and a monofunctional alcohol having between 5 and 10 carbon atoms.
The following table summarizes a comparison of the physical properties of several esters for use in the composition of the present invention with a hydrocarbon oil having a low aromatics content used as a drilling liquid.
Table. Comparison of physical properties.
Physical SHELLSOL DMA Ester Ester Ester Ester property (Trade name) A B C D
Flash point ("C) 95 126 130 179 81
Pour point ("C) < -30 -30 -12 -30 < -50 **
Density (kg/l) 0.80 0.86 0.86 0.86 0.86 Kinematic viscosity at 0 "C (cSt) - 8 14 19 3.9 at 20 "C (cSt) 3.05 4 7 9 2.4 at 40 C (cSt) 2.05 2.6 4 6 1.6
Aromatic content (%m) < 0.2 nil nil nil nil *
determined at 15 OC.
determined at 20 "C.
Ester A is made from acetic acid and a mixture of monofunctional alcohols having between 7 and 12 carbon atoms. Ester B is made from acetic acid and a mixture of monofunctional alcohols having between 11 and 14 carbon atoms. Ester C is made from a mixture of monocarboxylic acids having between 6 and 14 carbon atoms and 2-ethylhexanol. Ester D is made from acetic acid and a mixture of monofunctional alcohols having between 5 and 10 carbon atoms.
From the above Table it can be concluded that the esters have properties that are similar to the properties of a hydrocarbon oil and that therefore they can replace hydrocarbon oils in a true oil drilling liquid.
The drilling drilling liquid can further contain additives which are known in the art, such as viscosifiers and fluid loss control agents.
Claims (11)
1. True oil drilling liquid essentially comprising an oil phase, wherein the oil phase includes an ester of a carboxylic acid and an alcohol.
2. True oil drilling liquid according to claim 1, wherein the carboxylic acid is a polycarboxylic acid and wherein the group to which the carboxyl groups are connected contains between 2 and 26 carbon atoms.
3. True oil drilling liquid according to claim 1, wherein the carboxylic acid is a dicarboxylic acid and wherein the moiety to which the carboxyl groups are connected contains between 2 and 10 carbon atoms.
4. True oil drilling liquid according to claim 1, wherein the carboxylic acid is a dicarboxylic acid and wherein the moiety to which the carboxyl groups are connected contains between 4 and 26 carbon atoms and wherein the distance between the carboxyl groups is bridged by a chain having between 2 and 10 carbon atoms.
5. True oil drilling liquid according to claim 1, wherein the carboxylic acid is a monocarboxylic acid and wherein the moiety connected to the carboxyl group contains between 1 and 26 carbon atoms.
6. True oil drilling liquid according to any one of the claims 1-5, wherein the alcohol is a polyfunctional alcohol containing between 2 and 10 carbon atoms.
7. True oil drilling liquid according to any one of the claims 1-5, wherein the alcohol is a monofunctional alcohol containing between 1 and 16 carbon atoms.
8. True oil drilling liquid according to any one of the claims 1-5, wherein the alcohol is an alkoxylated alcohol comprising an alkyl group of between 1 and 16 carbon atoms and an average number of between 0.5 and 9 alkoxy groups.
9. True oil drilling liquid according to claim 8, wherein the alkoxy groups are ethoxy groups.
10. The use of the true oil drilling liquid according to any one of the claims 1-9 for drilling a borehole in an underground formation.
11. The use of an ester of a carboxylic acid and an alcohol as true oil drilling liquid.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP92302889 | 1992-04-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9306665D0 GB9306665D0 (en) | 1993-05-26 |
| GB2265646A true GB2265646A (en) | 1993-10-06 |
Family
ID=8211310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9306665A Withdrawn GB2265646A (en) | 1992-04-02 | 1993-03-31 | True oil drilling liquid |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2265646A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6599863B1 (en) | 1999-02-18 | 2003-07-29 | Schlumberger Technology Corporation | Fracturing process and composition |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991019771A1 (en) * | 1990-06-16 | 1991-12-26 | Henkel Kommanditgesellschaft Auf Aktien | Fluid borehole-conditioning agent based on polycarboxylic acid esters |
-
1993
- 1993-03-31 GB GB9306665A patent/GB2265646A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991019771A1 (en) * | 1990-06-16 | 1991-12-26 | Henkel Kommanditgesellschaft Auf Aktien | Fluid borehole-conditioning agent based on polycarboxylic acid esters |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6599863B1 (en) | 1999-02-18 | 2003-07-29 | Schlumberger Technology Corporation | Fracturing process and composition |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9306665D0 (en) | 1993-05-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |