US3129760A - Hot caustic treatment of earth formations - Google Patents

Hot caustic treatment of earth formations Download PDF

Info

Publication number
US3129760A
US3129760A US705795A US70579557A US3129760A US 3129760 A US3129760 A US 3129760A US 705795 A US705795 A US 705795A US 70579557 A US70579557 A US 70579557A US 3129760 A US3129760 A US 3129760A
Authority
US
United States
Prior art keywords
formation
pressure
aluminum
oil
induce
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.)
Expired - Lifetime
Application number
US705795A
Inventor
Gambill Marvin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US705795A priority Critical patent/US3129760A/en
Application granted granted Critical
Publication of US3129760A publication Critical patent/US3129760A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60Compositions for stimulating production by acting on the underground formation
    • C09K8/84Compositions based on water or polar solvents
    • C09K8/845Compositions based on water or polar solvents containing inorganic compounds
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • E21B43/2405Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection in association with fracturing or crevice forming processes
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • E21B43/267Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping

Definitions

  • This invention relates to a method and composition for treatment of earth formations around oil wells to assist in improving the flow of oil coming from the formation.
  • Acidizing techniques for relieving these congested conditions in oil wells have been developed to a highly scien tific level, in general identifiable as the matching of the reactive capacity of an acid under high pressure high temperature conditions for the chemical compounds making up the oil formation.
  • the use of caustic alkalis in the treatment of oil formations has also been developed to a certain extent, but inasmuch as relatively few conditions yield to caustic disintegration, the technique is not common.
  • Another object of the invention is to provide a fluid medium suitable for use in fracture treatments, either by pressure alone or by heat, pressure and even explosive treatment at the underground level.
  • the invention accordingly, is embodied in a process for the hot caustic treatment of an oil well and the earth formation surrounding the well in which, first, a finely divided metal such as aluminum in an oil suspension or in water is injected into the oil well under pressure, which pressure may be of fracturing levels, and is followed by a solution of caustic alkali, which may beat any temperature from ambient to boiling at the surface.
  • a finely divided metal such as aluminum in an oil suspension or in water
  • caustic alkali which may beat any temperature from ambient to boiling at the surface.
  • an optional additional step of the operation involves, after a period of time, the introduction of an oxidizing agent,
  • ingredients are forced into the formation under high pressure, the pressure is main tained and when a sudden pressure drop occurs it is taken as an indication of fracture in the formation.
  • aqueous sodium hydroxide solution which need be only at ambient temperature, but may be at any temperature up to boiling.
  • concentration of the sodium hydroxide solution is about 2030 percent solids for in this range an adequate quantity of the chemical can be introduced to the earth formation in a reasonable volume of the liquid.
  • Typical quantities for using in the treatment of an oil well are the following:
  • the presence of hydrogen in the formation creates a certain explosive hazard at the well head, and the hazard can be converted to the advantage of the operator in the treatment of the earth formation,,as noted above. That is, the sodium hydroxide can be added in portions and by introducing regulated amounts of potassium chlorate, for example, by introducing an occasional few gallons of concentrated solution in the stream of the sodium hydroxide being pumped into the well, the potassium chlorate reaches the earth formation virtually intact and upon contacting the earth formation the combustible organic matter, including the hydrogen, is burned by the potassium (or sodium) chlorate with explosive violence, thus inducing further additional mechanical fracturing of the formation.
  • the sodium hydroxide can be added in portions and by introducing regulated amounts of potassium chlorate, for example, by introducing an occasional few gallons of concentrated solution in the stream of the sodium hydroxide being pumped into the well, the potassium chlorate reaches the earth formation virtually intact and upon contacting the earth formation the combustible organic matter, including the hydrogen, is burned
  • a real advantage of this treatment of the oil wells resides in the fact that caustic solutions, although not pleasant to handle by operators, are relatively non-corrosive in their contact with the metal parts around oil wells,
  • the chemicals useful in the operation may be any technical or commercial grades.
  • the sodium hydroxide may be purchased as a solution in about the concentration desired.
  • the aluminum may be used as a powder of the finely divided type used in paints or as a chemical reagent. However, this may be economically impracticable on a very large scale. Actually the preferred form of aluminum is a relatively crude mixture of pellets, cuttings, powder, etc.
  • the source may be from chemical reagent pellets, powders, foil cuttings to the much less exotic machine shop shavings or macerated pots and pans.
  • the method of treating earth formations to induce fractures therein to promote flow of oil comprises, injecting into such formations under high pressure sufficient to induce fracture of said formation a liquid characterized by its carrying solid aluminum particles suspended therein, maintaining said pressure for a predetermined interval of time, to cause aluminum particles to enter said formation, introducing thereafter an aqueous caustic alkali solution under high pressure to contact said aluminum particles, thereby to induce an exothermic gas generating reaction in said earth formation, and, thereafter, releasing said pressure.
  • the method of fracture treating earth formations which comprises injecting into such formations under high pressure sufiicient to induce fracture of said formation a liquid containing about 5-25 percent by weight of finely divided metallic aluminum particles suspended therein, said aluminum at coarsest being about inch diameter particles, maintaining said pressure for a predetermined interval of time, injecting under pressure after said aluminum at least sufficient aqueous caustic alkali solutions in 550 percent concentration to dissolve all of said aluminum, forming a gas generating system maintaining said system in a closed formation until a sudden drop in pressure from the maximum pressure generated is experienced and then releasing pressure.

Description

XR 3129760 5R 3,129,760 HOT CAUSTIC TREATMENT OF EARTH FORMATIONS Marvin Gambill, 1300 Lano Drive, Hobbs, N. Mex. No Drawing. Filed Dec. 30, 1957, Ser. No. 705,795 7 Claims. (Cl. 166-38) This invention relates to a method and composition for treatment of earth formations around oil wells to assist in improving the flow of oil coming from the formation.
It is a characteristic of an oil well that the rate of flow diminishes with time and, unfortunately, altogether too frequently the economic point at which pumping of the well should be stopped as unprofitable is reached while there still remains a very substantial quantity of oil in the formation. Reasons for the loss of flow are varied and complex but are related generally to the chemical nature of the formation, porosity, and the accumulation of wax or asphaltic deposits in the pores of the formation, as well as the accumulation of scale and other corruption in the tubes in the bottom of the well.
Acidizing techniques for relieving these congested conditions in oil wells have been developed to a highly scien tific level, in general identifiable as the matching of the reactive capacity of an acid under high pressure high temperature conditions for the chemical compounds making up the oil formation. The use of caustic alkalis in the treatment of oil formations has also been developed to a certain extent, but inasmuch as relatively few conditions yield to caustic disintegration, the technique is not common.
It is a fundamental object of this invention to provide a modified hot caustic treatment for earth formations surrounding an oil well in which the chemical and physical properties of the caustic solution are used to maximum advantages in the downhole location.
Another object of the invention is to provide a technique by which mechanical pressure and blasting at the underground levels can be accomplished.
Another object of the invention is to provide a fluid medium suitable for use in fracture treatments, either by pressure alone or by heat, pressure and even explosive treatment at the underground level.
Other objects and advantages of the invention will in part be obvious and in part appear hereinafter.
The invention, accordingly, is embodied in a process for the hot caustic treatment of an oil well and the earth formation surrounding the well in which, first, a finely divided metal such as aluminum in an oil suspension or in water is injected into the oil well under pressure, which pressure may be of fracturing levels, and is followed by a solution of caustic alkali, which may beat any temperature from ambient to boiling at the surface. With contact between the caustic and the aluminum in the underground formation, a highly exothermic reaction occurs in which hydrogen is generated together with much heat so that the formation and the solution are heated, and mechanical and chemical effects are obtained simultaneously in the earth formation. The result is a large buildup of hydrogen pressure and steam pressure in the earth formation, which produces fracturing and mechanical loosening of extraneous deposits, reducing the porosity of formation. T improve the effectiveness of the mechanical effect, an optional additional step of the operation involves, after a period of time, the introduction of an oxidizing agent,
such as sodium or potassium chlorate into the caustic solution, for example, into the last 20 or 30 percent of the caustic solution, with the result that when the oxidizing agent reaches the earth formation, hydrogen is explosively burned and actual combustion of organic compositions occurs. In general, this latter procedure is not necessary and in view of the hazards involved, it is not desirable,
3,129,760 Patented Apr. 21, 1964 except as a last final drastic measure in an effort to open the well.
In my co-pending application, Serial No. 663,915, now Patent No. 3,000,442, I describe a fracture treatment for earth formations in which sodium chloride pellets are injected under pressure in preferred medium into the earth formation. In accordance with this invention, the aqueous medium or liquid medium used in my co-pending applicationnamely, the brine or the oil may serve as the vehicle for bringing aluminum powder or pellets down into the earth formation, where it is subjected to heavy pressure for such mechanical fracture as fast as can be induced by that technique. It is to be understood that the technique described in my said application is useful in conjunction with the process described herein.
In any fracture treatment, ingredients are forced into the formation under high pressure, the pressure is main tained and when a sudden pressure drop occurs it is taken as an indication of fracture in the formation.
In the preferred practice of my invention, therefore, following the introduction of an appropriate quantity of aluminum, I add aqueous sodium hydroxide solution which need be only at ambient temperature, but may be at any temperature up to boiling. The preferred concentration of the sodium hydroxide solution is about 2030 percent solids for in this range an adequate quantity of the chemical can be introduced to the earth formation in a reasonable volume of the liquid. Typical quantities for using in the treatment of an oil well are the following:
Since the reaction of aluminum with caustic alkali is on a mole-per-mole basis, quantities may be calculated accordingly. Generally it is preferable to operate with an excess of alkali.
Following the introduction of the sodium hydroxide a very intense chemical reaction is induced in the exact areas to which the aluminum pellets penetrate, and the generation of heat at the actual site of the reaction, to gether with the generation of steam and hydrogen, induces additional fracturing and loosening of the formation.
The presence of hydrogen in the formation creates a certain explosive hazard at the well head, and the hazard can be converted to the advantage of the operator in the treatment of the earth formation,,as noted above. That is, the sodium hydroxide can be added in portions and by introducing regulated amounts of potassium chlorate, for example, by introducing an occasional few gallons of concentrated solution in the stream of the sodium hydroxide being pumped into the well, the potassium chlorate reaches the earth formation virtually intact and upon contacting the earth formation the combustible organic matter, including the hydrogen, is burned by the potassium (or sodium) chlorate with explosive violence, thus inducing further additional mechanical fracturing of the formation.
Where it is desired to use the chlorate treatment to induce additional fracturing, it is best carried out after about /z% of the caustic alkali has been added.
A real advantage of this treatment of the oil wells resides in the fact that caustic solutions, although not pleasant to handle by operators, are relatively non-corrosive in their contact with the metal parts around oil wells,
so that little attention need be paid to the prevention of corrosion. This is in direct contrast to oil well acidizing techniques where a major problem and major limitation on the use of an acid is the reduction of the extent to which it will dissolve the metal parts in the Well and associated pumps.
The chemicals useful in the operation may be any technical or commercial grades. The sodium hydroxide may be purchased as a solution in about the concentration desired.
The aluminum may be used as a powder of the finely divided type used in paints or as a chemical reagent. However, this may be economically impracticable on a very large scale. Actually the preferred form of aluminum is a relatively crude mixture of pellets, cuttings, powder, etc.
to obtain a rather random distribution of particle size to give recognition to the fact that the earth formation fissures etc., will be penetrated by such variety of sizes. Mixtures with particles of aluminum as large as /2 inch in diameter may be used. The source, as noted, may be from chemical reagent pellets, powders, foil cuttings to the much less exotic machine shop shavings or macerated pots and pans.
Though the invention has been described in relation to a single embodiment, it is to be understood that variations thereof may be practiced Without departing from its spirit or scope.
What is claimed is:
1. The method of treating earth formations to induce fractures therein to promote flow of oil which comprises, injecting into such formations under high pressure sufficient to induce fracture of said formation a liquid characterized by its carrying solid aluminum particles suspended therein, maintaining said pressure for a predetermined interval of time, to cause aluminum particles to enter said formation, introducing thereafter an aqueous caustic alkali solution under high pressure to contact said aluminum particles, thereby to induce an exothermic gas generating reaction in said earth formation, and, thereafter, releasing said pressure.
2. The method in accordance with claim 1 in which the liquid medium carrying the aluminum particles is a hydrocarbon.
3. The method in accordance with claim 1 in which the liquid medium carrying the aluminum particles is water.
4. The method in accordance with claim 1 in which the aluminum is followed by the addition of at least the stoichiometric amount of caustic alkali needed to dissolve it.
5. The method of fracture treating earth formations which comprises injecting into such formations under high pressure sufiicient to induce fracture of said formation a liquid containing about 5-25 percent by weight of finely divided metallic aluminum particles suspended therein, said aluminum at coarsest being about inch diameter particles, maintaining said pressure for a predetermined interval of time, injecting under pressure after said aluminum at least sufficient aqueous caustic alkali solutions in 550 percent concentration to dissolve all of said aluminum, forming a gas generating system maintaining said system in a closed formation until a sudden drop in pressure from the maximum pressure generated is experienced and then releasing pressure.
6. The method in accordance with claim 5 in which the liquid medium carrying the aluminum is oil.
7. The method in accordance with claim 5 in which the liquid medium carrying the aluminum is water.
References Cited in the file of this patent UNITED STATES PATENTS Barrett July 5, 1960

Claims (1)

1. THE METHOD OF TREATING EARTH FORMATION TO INDUCE FRACTURES THEREIN TO PROMOTE FLOW OF OIL WHICH COMPPRISES, INJECTING INTO SUCH FORMATIONS UNDER HIGH PRESSURE SUFFICIENT TO INDUCE FRACTURE OF SAID FORMATION A LIQUID CHARACTERIZED BY ITS CARRYING SOLID ALUMINUM PARTICLES SUSPENDED THEREIN, MAINTAINING SAID PRESSURE FOR A PREDETERMINED INTERVAL OF TIME, TO CAUSE ALUMINUM PARTICLES TO ENTER SAID FORMATION, INTRODUCING THEREAFTER AN AQUEOUS CAUSTIC ALKALI SOLUTION UNDER HIGH PRESSURE TO CONTACT SAID ALUMINUM PARTICLES, THEREBY TO INDUCE AN EXOTHERMIC GAS GENERATING REACTION IN SAID EARTH FORMATION, AND, THEREAFTER, RELEASING SAID PRESSURE.
US705795A 1957-12-30 1957-12-30 Hot caustic treatment of earth formations Expired - Lifetime US3129760A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US705795A US3129760A (en) 1957-12-30 1957-12-30 Hot caustic treatment of earth formations

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US705795A US3129760A (en) 1957-12-30 1957-12-30 Hot caustic treatment of earth formations

Publications (1)

Publication Number Publication Date
US3129760A true US3129760A (en) 1964-04-21

Family

ID=24834982

Family Applications (1)

Application Number Title Priority Date Filing Date
US705795A Expired - Lifetime US3129760A (en) 1957-12-30 1957-12-30 Hot caustic treatment of earth formations

Country Status (1)

Country Link
US (1) US3129760A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3270815A (en) * 1963-09-11 1966-09-06 Dow Chemical Co Combination hydraulic-explosive earth formation fracturing process
US3386511A (en) * 1966-06-27 1968-06-04 Frank J. Messina Production stimulation method for oil wells
US4330037A (en) * 1980-12-12 1982-05-18 Shell Oil Company Well treating process for chemically heating and modifying a subterranean reservoir
US4590997A (en) * 1985-01-28 1986-05-27 Mobil Oil Corporation Controlled pulse and peroxide fracturing combined with a metal containing proppant
US20050167104A1 (en) * 2004-01-30 2005-08-04 Roddy Craig W. Compositions and methods for the delivery of chemical components in subterranean well bores

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1351945A (en) * 1919-11-01 1920-09-07 John R Dulany Method of cleaning oil and gas wells
US1736440A (en) * 1929-11-19 Method fob cleaning oil-pipe lines
US2207184A (en) * 1937-09-29 1940-07-09 White Harry Calvin Method of conditioning wells
US2228629A (en) * 1938-12-20 1941-01-14 Walter M Jarrell Method of treating oil and gas wells
US2766828A (en) * 1953-07-20 1956-10-16 Exxon Research Engineering Co Fracturing subsurface formations and well stimulation
US2799342A (en) * 1954-07-30 1957-07-16 California Research Corp Process for treating oil well formations
US2889884A (en) * 1956-10-12 1959-06-09 Gulf Research Development Co Process for increasing permeability of oil bearing formation
US2943681A (en) * 1957-04-29 1960-07-05 Michael W Barrett Fracturing using calcium carbide

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1736440A (en) * 1929-11-19 Method fob cleaning oil-pipe lines
US1351945A (en) * 1919-11-01 1920-09-07 John R Dulany Method of cleaning oil and gas wells
US2207184A (en) * 1937-09-29 1940-07-09 White Harry Calvin Method of conditioning wells
US2228629A (en) * 1938-12-20 1941-01-14 Walter M Jarrell Method of treating oil and gas wells
US2766828A (en) * 1953-07-20 1956-10-16 Exxon Research Engineering Co Fracturing subsurface formations and well stimulation
US2799342A (en) * 1954-07-30 1957-07-16 California Research Corp Process for treating oil well formations
US2889884A (en) * 1956-10-12 1959-06-09 Gulf Research Development Co Process for increasing permeability of oil bearing formation
US2943681A (en) * 1957-04-29 1960-07-05 Michael W Barrett Fracturing using calcium carbide

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3270815A (en) * 1963-09-11 1966-09-06 Dow Chemical Co Combination hydraulic-explosive earth formation fracturing process
US3386511A (en) * 1966-06-27 1968-06-04 Frank J. Messina Production stimulation method for oil wells
US4330037A (en) * 1980-12-12 1982-05-18 Shell Oil Company Well treating process for chemically heating and modifying a subterranean reservoir
US4590997A (en) * 1985-01-28 1986-05-27 Mobil Oil Corporation Controlled pulse and peroxide fracturing combined with a metal containing proppant
US20050167104A1 (en) * 2004-01-30 2005-08-04 Roddy Craig W. Compositions and methods for the delivery of chemical components in subterranean well bores
US7204312B2 (en) * 2004-01-30 2007-04-17 Halliburton Energy Services, Inc. Compositions and methods for the delivery of chemical components in subterranean well bores

Similar Documents

Publication Publication Date Title
US3195634A (en) Fracturing process
US3396107A (en) Composition for fracturing process
US2094479A (en) Treatment of wells
US4454917A (en) Thermal acidization and recovery process for recovering viscous petroleum
US2966457A (en) Gelled fracturing fluids
US1806499A (en) Method
US3233672A (en) Acidizing a petrolific formation
US2672201A (en) Increasing production of oil wells
US3129760A (en) Hot caustic treatment of earth formations
US3063499A (en) Treating an underground formation by hydraulic fracturing
US2146480A (en) Process of shutting off water or other extraneous fluid in oil wells
US3712380A (en) Method for reworking and cleaning wells
US3354957A (en) Method of acid treating wells
US2880802A (en) Recovery of hydrocarbons from oil-bearing strata
CA1109659A (en) Method for acidizing high temperature subterranean formations
US3358763A (en) Liquid nitrogen in well operations
US3645336A (en) Method for plugging highly permeable zones
US2366373A (en) Acid treating wells
US1532826A (en) Treatment of coal
US3121462A (en) Method of formation consolidation
US1911446A (en) Method of treating deep wells
US2204224A (en) Process for treating oil wells
US2679294A (en) Increasing production of oil wells
US3193014A (en) Apparatus for fracturing subsurface formations
US2135909A (en) Process for removing mud sheaths from geological formations