IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0305807
(2006-10-11)
|
등록번호 |
US-8298998
(2012-10-30)
|
국제출원번호 |
PCT/US2006/039612
(2006-10-11)
|
§371/§102 date |
20081219
(20081219)
|
국제공개번호 |
WO2007/149112
(2007-12-27)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- Contact Marketing Solutions, LLS
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
10 |
초록
▼
An aqueous mixture of a non-toxic, low pH, antimicrobial, acidic composition having a pH between approximately 0.5 and approximately 3.5 is used in a drilling fluid and a stuck pipe additive. One embodiment of the stuck pipe additive composition includes an alkali metal halide salt in a range of app
An aqueous mixture of a non-toxic, low pH, antimicrobial, acidic composition having a pH between approximately 0.5 and approximately 3.5 is used in a drilling fluid and a stuck pipe additive. One embodiment of the stuck pipe additive composition includes an alkali metal halide salt in a range of approximately 10-35 weight %; a sequenching agent in a range between 2-8 weight %, a low pH, non-toxic acid composition in a range of 0.5-20 weight percent and water in a range of 7-88.5 weight %. As a drilling fluid, it maintains well control and removes drill cuttings from holes drilled into the earth. As a spotting fluid, it frees a stuck drill stem in the annulus of a bore hole in minutes.
대표청구항
▼
1. A spotting fluid for releasing stuck drill pipe, comprising (a) an aqueous based continuous phase that has the characteristics of brine; and (b) a non-toxic, low pH acidic composition with antimicrobial properties prepared by the process of combining a high purity inorganic acid with water and a
1. A spotting fluid for releasing stuck drill pipe, comprising (a) an aqueous based continuous phase that has the characteristics of brine; and (b) a non-toxic, low pH acidic composition with antimicrobial properties prepared by the process of combining a high purity inorganic acid with water and a metallic sulfate compound, heating the mixture to approximately 140° F. to form mixture (I), placing mixture (I) in a pressurized vessel and heating the mixture, under pressure, to temperatures in a range between approximately 200° F. and 400° F., cooling the mixture, and adding a stabilizing amount of the starting mixture (I) to the cooled mixture, wherein the pH of the spotting fluid is less than 6.5. 2. The spotting fluid of claim 1, wherein the aqueous based continuous phase is brine. 3. The spotting fluid of claim 1, wherein the aqueous based continuous phase is sea water. 4. The spotting fluid of claim 3, wherein the mixing ratio of sea water to low pH acidic composition is in a range between approximately 3 ml to approximately 20 ml of low pH acid to one gallon of sea water. 5. The spotting fluid of claim 1, wherein the high purity acid is selected from the group consisting of sulfuric acid, phosphoric acid, fumaric acid and acetic acid. 6. The spotting fluid of claim 1, wherein the metallic sulfate is selected from the group consisting of sodium sulfate, magnesium sulfide, zinc sulfate, manganese sulfate, and copper sulfate. 7. A stuck pipe additive composition for releasing a stuck drill pipe in subterranean drilling, comprising the spotting fluid of claim 1, an alkali metal halide salt, and at least one of sodium acid pyrophosphate and calcium acid pyrophosphate. 8. The stuck pipe additive composition of claim 7, wherein the aqueous based continuous phase is at least one of brine and sea water. 9. The stuck pipe additive composition of claim 8, wherein the mixing ratio of sea water to low pH acidic composition is in a range between approximately 3 ml to approximately 20 ml of low pH acid to one gallon of sea water. 10. The stuck pipe additive composition of claim 7, wherein the high purity acid is selected from the group consisting of sulfuric acid, phosphoric acid, fumaric acid and acetic acid. 11. The stuck pipe additive composition of claim 7, wherein the metallic sulfate is selected from the group consisting of sodium sulfate, magnesium sulfate, zinc sulfate, manganese sulfate, and copper sulfate. 12. The stuck pipe additive composition of claim 7, wherein the alkali metal halide salt is selected from potassium chloride, sodium chloride and magnesium chloride. 13. A method for releasing a stuck drill pipe, comprising contacting an interval of a borehole in which a drill string has become stuck due to the formation of a wall cake with the spotting fluid of claim 1; allowing a time interval of from approximately 5 minutes to approximately 1 hour for the spotting fluid to break down the wall cake; and releasing the stuck drill string. 14. A drilling fluid comprising the low pH acidic composition of claim 1 and a viscosifier selected from the group consisting of a gum, a gypsum and a gel. 15. A method for releasing a stuck drill pipe comprising contacting an interval of a borehole in which a drill string has become stuck with a spotting fluid comprising (a) an aqueous based continuous phase and (b) a low pH acidic composition prepared by the process of combining a high purity inorganic acid with water and an ammonium compound, heating the mixture to approximately 140° F. to form mixture (I), placing mixture (I) in a pressurized vessel and heating the mixture, under pressure, to temperatures in a range between approximately 200° F. and 400° F., then cooling the mixture, after the mixture is cooled adding a stabilizing amount of the starting mixture (I), wherein the pH of the spotting fluid is less than 6.5. 16. The method of claim 15, wherein the ammonium compound is selected from the group consisting of anhydrous ammonia, ammonium sulfate, and buffered ammonium nitrate.
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