Foamed fluid additive for underbalance drilling
View Patent ↗A method of drilling or gas-lifting is disclosed where the methods including the use of a foaming agent and a gas, where the foaming agent is a keratin and the hydrostatic pressure of the fluid in the well is for a portion of the drilling or gas-lift operation less than an hydrostatic pressure of the formation being drilled or under production.
1. A method for drilling comprising the steps of
drilling an oil and/or gas well with a drilling fluid including an effective amount of a bio-degradable foaming composition and an effective amount of a gas, where the foaming composition comprises at least one hydrolyzed keratin and the amounts are sufficient to reduce a hydrostatic pressure of the drilling fluid to a value at or below a hydrostatic pressure of the formation being drilled, where the effective amount of bio-degradable foaming composition is between 0.42 lb/bbl and 4.2 lb/bbl having a foam height between 160 mL and 530 mL and foam half-lives between 0:22 and 21:48.
2. The method of claim 1 , wherein the foaming composition further comprises at least one additive selected from the group consisting of sulfur scavengers, corrosion inhibitors, scale inhibitors, oxygen control agents, hydrocarbon accumulation agents and mixtures or combinations thereof, where the foam improves an activity of the at least one additive and the additive may improve foaming characteristics of the at least one hydrolyzed keratin.
3. The method of claim 1 , wherein the foaming composition further comprises a foaming additive selected from the group consisting of winterizing agents, foam boosters, anti-freeze agents, solvents, sodium salt of alpha olefin sulfonates (AOSs), acid salts, fatty acids, foam enhancers and mixtures or combinations thereof.
4. The method of claim 3 , wherein the winterizing agents are selected from the group consisting of lithium formate, sodium formate, potassium formate, cesium formate, triethyanolamine formate, and mixtures or combinations; the foam boosters comprise a cellosolve of the general formula R 9 OCH 2 CH 2 OH where R 9 is an alkyl group having between about 2 and about 8 carbon atoms and mixtures or combinations; the anti-freeze agents selected from the group consisting of alcohols, glycols or other freezing point depressing agents and mixtures or combinations; the solvents selected from the group consisting of water, alcohols, ethers, esters or mixtures or combinations thereof; the sodium salt of alpha olefin sulfonates (AOSs) selected from the group consisting of short chain alpha olefin sulfonates having between about 2 and about 10 carbon atoms, longer chain alpha olefin sulfonates having between about 10 and about 24 carbon atoms and mixtures or combinations thereof; the acid salts selected from the group consisting of cyclamic acid salts such as sodium (cyclamate), potassium, salts of sulfonated methyl esters having between about 12 and about 22 carbon atoms, where the salt is sodium, potassium, ammonium, alkylammonium, salts of 2-aminoethane sulfonic acids, where the salt is an alkali metal, ammonium, or alkylammonium, and mixtures or combinations thereof; the fatty acids are selected from the group consisting of lauric acid, oleic acid, stearic acid and mixtures or combinations; and the foam enhancers are selected from the group consisting of a linear dodecyl benzene sulfonic acid salt, a sarcosinate salt, and mixtures or combinations thereof.
5. A method for drilling comprising the steps of
drilling an oil and/or gas well with a drilling fluid while changing an effective amount of a bio-degradable foaming composition and an effective amount of a gas so that a hydrostatic pressure of the drilling fluid is maintained at a desired level at or below a hydrostatic pressure of the formation being drilled, where the foaming composition comprises at least one hydrolyzed keratin, where the effective amount of bio-degradable foaming composition is between 0.42 lb/bbl and 4.2 lb/bbl having a foam height between 160 mL and 530 mL and foam half-lives between 0:22 and 21:48.
6. The method of claim 5 , wherein the foaming composition further comprises at least one additive selected from the group consisting of sulfur scavengers, corrosion inhibitors, scale inhibitors, oxygen control agents, hydrocarbon accumulation agents and mixtures or combinations thereof, where the foam improves an activity of the at least one additive and the additive may improve foaming characteristics of the at least one hydrolyzed keratin.
7. The method of claim 5 , wherein the foaming composition further comprises a foaming additive selected from the group consisting of winterizing agents, foam boosters, anti-freeze agents, solvents, sodium salt of alpha olefin sulfonates (AOSs), acid salts, fatty acids, foam enhancers and mixtures or combinations thereof.
8. The method of claim 7 , wherein the winterizing agents is selected from the group consisting of lithium formate, sodium formate, potassium formate, cesium formate, triethyanolamine formate, and mixtures or combinations; the foam boosters comprise a cellosolve of the general formula R 9 OCH 2 CH 2 OH where R 9 is an alkyl group having between about 2 and about 8 carbon atoms and mixtures or combinations; the anti-freeze agents selected from the group consisting of alcohols, glycols or other freezing point depressing agents and mixtures or combinations; the solvents selected from the group consisting of water, alcohols, ethers, esters or mixtures or combinations thereof; the sodium salt of alpha olefin sulfonates (AOSs) selected from the group consisting of short chain alpha olefin sulfonates having between about 2 and about 10 carbon atoms, longer chain alpha olefin sulfonates having between about 10 and about 24 carbon atoms and mixtures or combinations thereof; the acid salts selected from the group consisting of cyclamic acid salts such as sodium (cyclamate), potassium, salts of sulfonated methyl esters having between about 12 and about 22 carbon atoms, where the salt is sodium, potassium, ammonium, alkylammonium, salts of 2-aminoethane sulfonic acids, where the salt is an alkali metal, ammonium, or alkylammonium, and mixtures or combinations thereof; the fatty acids are selected from the group consisting of lauric acid, oleic acid, stearic acid and mixtures or combinations; and the foam enhancers are selected from the group consisting of a linear dodecyl benzene sulfonic acid salt, a sarcosinate salt, and mixtures or combinations thereof.
9. A method for drilling comprising the steps of
drilling a first section of an oil and/or gas well with a drilling fluid, where a hydrostatic pressure of the drilling fluid is maintained at a desired level above a hydrostatic pressure of the formation being drilled, and
drilling a second section of the well with a drilling fluid including an effective amount of a bio-degradable foaming composition and an effective amount of a gas so that a hydrostatic pressure of the drilling fluid is maintained at a desired level at or below a hydrostatic pressure of the formation being drilled, where the foaming composition comprises at least one hydrolyzed keratin and where the effective amount of bio-degradable foaming composition is between 0.42 lb/bbl and 4.2 lb/bbl having a foam height between 160 mL and 530 mL and foam half-lives between 0:22 and 21:48.
10. The method of claim 9 , wherein the foaming composition further comprises at least one additive selected from the group consisting of sulfur scavengers, corrosion inhibitors, scale inhibitors, oxygen control agents, hydrocarbon accumulation agents and mixtures or combinations thereof, where the foam improves an activity of the at least one additive and the additive may improve foaming characteristics of the at least one hydrolyzed keratin.
11. The method of claim 9 , wherein the foaming composition further comprises a foaming additive selected from the group consisting of winterizing agents, foam boosters, anti-freeze agents, solvents, sodium salt of alpha olefin sulfonates (AOSs), acid salts, fatty acids, foam enhancers and mixtures or combinations thereof.
12. The method of claim 11 , wherein the winterizing agents are selected from the group consisting of lithium formate, sodium formate, potassium formate, cesium formate, triethyanolamine formate, and mixtures or combinations; the foam boosters comprise a cellosolve of the general formula R 9 OCH 2 CH 2 OH where R 9 is an alkyl group having between about 2 and about 8 carbon atoms and mixtures or combinations; the anti-freeze agents selected from the group consisting of alcohols, glycols or other freezing point depressing agents and mixtures or combinations; the solvents selected from the group consisting of water, alcohols, ethers, esters or mixtures or combinations thereof; the sodium salt of alpha olefin sulfonates (AOSs) selected from the group consisting of short chain alpha olefin sulfonates having between about 2 and about 10 carbon atoms, longer chain alpha olefin sulfonates having between about 10 and about 24 carbon atoms and mixtures or combinations thereof; the acid salts selected from the group consisting of cyclamic acid salts such as sodium (cyclamate), potassium, salts of sulfonated methyl esters having between about 12 and about 22 carbon atoms, where the salt is sodium, potassium, ammonium, alkylammonium, salts of 2-aminoethane sulfonic acids, where the salt is an alkali metal, ammonium, or alkylammonium, and mixtures or combinations thereof; the fatty acids are selected from the group consisting of lauric acid, oleic acid, stearic acid and mixtures or combinations; and the foam enhancers are selected from the group consisting of a linear dodecyl benzene sulfonic acid salt, a sarcosinate salt, and mixtures or combinations thereof.
13. A method for foaming a fluid comprising the steps of:
inserting at least one capillary coiled tubing into a well borehole to a desired depth below a fluid level in the borehole and
injecting an effective amount of a bio-degradable foaming composition and an effective amount of a gas into the fluid to produce a foam,
where the foaming composition comprises at least one hydrolyzed keratin and where the effective amounts are sufficient to decrease a fluid column weight and to increase well fluids flow out of the well and where the effective amount of bio-degradable foaming composition is between 0.42 lb/bbl and 4.2 lb/bbl having a foam height between 160 mL and 530 mL and foam half-lives between 0:22 and 21:48.
14. The method of claim 13 , wherein the injecting comprises a single injection, multiple injections, periodic injections, continuation injections or mixtures or combinations thereof, depending on well requirements and desired flow rates.
15. The method of claim 13 , wherein the foaming composition further comprises at least one additive selected from the group consisting of sulfur scavengers, corrosion inhibitors, scale inhibitors, oxygen control agents, hydrocarbon accumulation agents and mixtures or combinations thereof, where the foam improves an activity of the at least one additive and the additive may improve foaming characteristics of the at least one hydrolyzed keratin.
16. The method of claim 13 , wherein the foaming composition further comprises a foaming additive selected from the group consisting of winterizing agents, foam boosters, anti-freeze agents, solvents, sodium salt of alpha olefin sulfonates (AOSs), acid salts, fatty acids, foam enhancers and mixtures or combinations thereof.
17. The method of claim 16 , wherein the winterizing agents are selected from the group consisting of lithium formate, sodium formate, potassium formate, cesium formate, triethyanolamine formate, and mixtures or combinations; the foam boosters comprise a cellosolve of the general formula R 9 OCH 2 CH 2 OH where R 9 is an alkyl group having between about 2 and about 8 carbon atoms and mixtures or combinations; the anti-freeze agents selected from the group consisting of alcohols, glycols or other freezing point depressing agents and mixtures or combinations; the solvents selected from the group consisting of water, alcohols, ethers, esters or mixtures or combinations thereof; the sodium salt of alpha olefin sulfonates (AOSs) selected from the group consisting of short chain alpha olefin sulfonates having between about 2 and about 10 carbon atoms, longer chain alpha olefin sulfonates having between about 10 and about 24 carbon atoms and mixtures or combinations thereof; the acid salts selected from the group consisting of cyclamic acid salts such as sodium (cyclamate), potassium, salts of sulfonated methyl esters having between about 12 and about 22 carbon atoms, where the salt is sodium, potassium, ammonium, alkylammonium, salts of 2-aminoethane sulfonic acids, where the salt is an alkali metal, ammonium, or alkylammonium, and mixtures or combinations thereof; the fatty acids are selected from the group consisting of lauric acid, oleic acid, stearic acid and mixtures or combinations; and the foam enhancers are selected from the group consisting of a linear dodecyl benzene sulfonic acid salt, a sarcosinate salt, and mixtures or combinations thereof.
18. A method comprising the steps of:
injecting into a downhole fluid an aqueous solution comprising a first effective amount of a bio-degradable foaming composition and an effective amount of a gas to produce a foam;
bringing the foam to a surface of the well;
adding a defoaming agent to the foam at the surface to break the foam and produce a two phase system;
separating production or organic fluids from the two phase system; and
optionally second adding a supplemental effective amount of the bio-degradable foaming composition to reform a foam, and
repeating the injecting, bringing, adding, separating and optional second adding steps,
where the foaming composition comprises at least one at least one hydrolyzed keratin and where the effective amounts are sufficient to decrease a fluid column weight and to increase well fluids flow out of the well and where the effective amount of bio-degradable foaming composition is between 0.42 lb/bbl and 4.2 lb/bbl having a foam height between 160 mL and 530 mL and foam half-lives between 0:22 and 21:48.
19. The method of claim 18 , further comprising the steps of:
repeating the injecting, bringing, adding, separating and optional second adding steps a desired number of times.
20. The method of claim 18 , wherein the foaming composition further comprises at least one additive selected from the group consisting of sulfur scavengers, corrosion inhibitors, scale inhibitors, oxygen control agents, hydrocarbon accumulation agents and mixtures or combinations thereof, where the foam improves an activity of the at least one additive and the additive may improve foaming characteristics of the at least one hydrolyzed keratin.
21. The method of claim 18 , wherein the foaming composition further comprises a foaming additive selected from the group consisting of winterizing agents, foam boosters, anti-freeze agents, solvents, sodium salt of alpha olefin sulfonates (AOSs), acid salts, fatty acids, foam enhancers and mixtures or combinations thereof.
22. The method of claim 21 , wherein the winterizing agents are selected from the group consisting of lithium formate, sodium formate, potassium formate, cesium formate, triethyanolamine formate, and mixtures or combinations; the foam boosters comprise a cellosolve of the general formula R 9 OCH 2 CH 2 OH where R 9 is an alkyl group having between about 2 and about 8 carbon atoms and mixtures or combinations; the anti-freeze agents selected from the group consisting of alcohols, glycols or other freezing point depressing agents and mixtures or combinations; the solvents selected from the group consisting of water, alcohols, ethers, esters or mixtures or combinations thereof; the sodium salt of alpha olefin sulfonates (AOSs) selected from the group consisting of short chain alpha olefin sulfonates having between about 2 and about 10 carbon atoms, longer chain alpha olefin sulfonates having between about 10 and about 24 carbon atoms and mixtures or combinations thereof; the acid salts selected from the group consisting of cyclamic acid salts such as sodium (cyclamate), potassium, salts of sulfonated methyl esters having between about 12 and about 22 carbon atoms, where the salt is sodium, potassium, ammonium, alkylammonium, salts of 2-aminoethane sulfonic acids, where the salt is an alkali metal, ammonium, or alkylammonium, and mixtures or combinations thereof; the fatty acids are selected from the group consisting of lauric acid, oleic acid, stearic acid and mixtures or combinations; and the foam enhancers are selected from the group consisting of a linear dodecyl benzene sulfonic acid salt, a sarcosinate salt, and mixtures or combinations thereof.