Patent US4382002A successfully refreshed from Google Patents.
US4382002A
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Drilling fluids containing an additive composition
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1981-06-24
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Granted: 1983-05-03
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Expires: 2001-06-24
Abstract
Abstract Aqueous drilling fluids containing a minor amount of an additive composition featuring mono- and di-esters of C12-C50 aliphatic hydrocarbon substituted succinic acids or anhydrides, such as octadecenyl succinic anhydride with thio-bis-alkanols such as dithiodiethanol. Such fluids are especially useful where reduced torque drilling fluids are needed. Another embodiment of this invention relates to a method of drilling utilizing the above-described fluids.
Inventors
- 👤 Thad O. Walker
- 👤 Darrell W. Brownawell
- 👤 Antonio Gutierrez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:02
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C07; C07C; C07C323/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
111 words
An alkaline drilling mud comprising particles of clayey material suspended in sufficient water to render it circulatable and an effective amount of an ester compound formed by the reaction of: (a) a thio-bis-alkanol of the formula: ##STR4## wherein R and R' each independently may be hydrogen, methyl or ethyl, x may be 1-4, y may be 0, 1 or 2, a, b, c, and d, each independently maybe 1-3; with (b) 1 to 2 moles, per mole of the thio-bis-alkanol, of an aliphatic hydrocarbon substituted succinic acid or anhydride wherein the aliphatic hydrocarbon group contains from about 12 to 50 carbon atoms whereby the drilling torque of said mud is reduced.
Claim 2
Dependent Claim
111 words
An alkaline drilling mud comprising particles of clayey material suspended in sufficient water to render it circulatable and an effective amount of an ester compound formed by the reaction of: (a) a thio-bis-alkanol of the formula: ##STR4## wherein R and R' each independently may be hydrogen, methyl or ethyl, x may be 1-4, y may be 0, 1 or 2, a, b, c, and d, each independently maybe 1-3; with (b) 1 to 2 moles, per mole of the thio-bis-alkanol, of an aliphatic hydrocarbon substituted succinic acid or anhydride wherein the aliphatic hydrocarbon group contains from about 12 to 50 carbon atoms whereby the drilling torque of said mud is reduced.
Claim 3
Dependent Claim
19 words
A mud according to claim 1 wherein said ester compound is the mono-ester of dithiodiethanol with octadecenyl succinic anhydride.
Claim 4
Dependent Claim
18 words
A mud according to claim 1 wherein said ester compound the di-ester of dithiodiethanol with octadecenyl succinic anhydride.
Claim 5
Dependent Claim
150 words
In a process for drilling a well with well drilling tools wherein there is circulated in the well an alkaline drilling mud containing particles of clayey material suspended in sufficient water to render the same circulatable, the method of reducing the drilling torque of the drilling mud comprising adding to each barrel of said mud from 0.1 to 10 pounds of an ester compound formed by the reaction of: (a) a thio-bis-alkanol of the formula: ##STR5## wherein R and R' each independently may be hydrogen, methyl or ethyl, x may be 1-4, y may be 0, 1 or 2, a, b, c, and d, each independently maybe 1-3; with (b) 1 to 2 moles, per mole of the thio-bis-alkanol, of an aliphatic hydrocarbon substituted succinic acid or anhydride wherein the aliphatic hydrocarbonyl group contains from about 12 to 50 carbon atoms whereby the drilling torque of said mud is reduced.
Claim 6
Dependent Claim
150 words
In a process for drilling a well with well drilling tools wherein there is circulated in the well an alkaline drilling mud containing particles of clayey material suspended in sufficient water to render the same circulatable, the method of reducing the drilling torque of the drilling mud comprising adding to each barrel of said mud from 0.1 to 10 pounds of an ester compound formed by the reaction of: (a) a thio-bis-alkanol of the formula: ##STR5## wherein R and R' each independently may be hydrogen, methyl or ethyl, x may be 1-4, y may be 0, 1 or 2, a, b, c, and d, each independently maybe 1-3; with (b) 1 to 2 moles, per mole of the thio-bis-alkanol, of an aliphatic hydrocarbon substituted succinic acid or anhydride wherein the aliphatic hydrocarbonyl group contains from about 12 to 50 carbon atoms whereby the drilling torque of said mud is reduced.
Claim 7
Dependent Claim
119 words
An additive combination for increasing the lubricity of drilling muds consisting essentially of from 30 to 70 parts by weight of an ester compound dissolved in a hydrocarbon solvent, said ester compound being formed by the reaction of: (a) a thio-bis-alkanol of the formula: ##STR6## wherein R and R' each independently may be hydrogen, methyl or ethyl, x may be 1-4, y may be 0, 1 or 2, a, b, c, and d, each independently maybe 1-3; with (b) 1 to 2 moles, per mole of the thio-bis-alkanol, of an aliphatic hydrocarbon substituted succinic acid or anhydride wherein the aliphatic hydrocarbon group contains from about 12 to 50 carbon atoms whereby the drilling torque of said mud is reduced.
Claim 8
Dependent Claim
119 words
An additive combination for increasing the lubricity of drilling muds consisting essentially of from 30 to 70 parts by weight of an ester compound dissolved in a hydrocarbon solvent, said ester compound being formed by the reaction of: (a) a thio-bis-alkanol of the formula: ##STR6## wherein R and R' each independently may be hydrogen, methyl or ethyl, x may be 1-4, y may be 0, 1 or 2, a, b, c, and d, each independently maybe 1-3; with (b) 1 to 2 moles, per mole of the thio-bis-alkanol, of an aliphatic hydrocarbon substituted succinic acid or anhydride wherein the aliphatic hydrocarbon group contains from about 12 to 50 carbon atoms whereby the drilling torque of said mud is reduced.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-02 | 1986-11-01 | 1987-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-02 | 1990-11-01 | 1991-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-02 | 1994-11-01 | 1995-05-03 | $7700.00 | Window Closed / Lapsed |