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US3354958A - Oil recovery using steam - Google Patents

Oil recovery using steam Download PDF

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Publication number
US3354958A
US3354958A US49609065A US3354958A US 3354958 A US3354958 A US 3354958A US 49609065 A US49609065 A US 49609065A US 3354958 A US3354958 A US 3354958A
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stratum
steam
well
liquid
oil
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Harry W Parker
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ConocoPhillips Co
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ConocoPhillips Co
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    • 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

Description

Nov. 28, 1967 H. w. PARKER OIL RECOVERY USING STEAM STEAM as g VOLATILE LIQUID HOT WAT R INVENTOR H. W. PARKER W A TTORNEVS United States Patent 3,354,958 OIL RECOVERY USING STEAM Harry W. Parker, Bartlesville, 0kla., assignor'to Phillips Petroleum Company, a corporation of Delaware Filed Oct. 14, 1965, Ser. No. 496,090 11 Claims. (Cl. 166-40) This invention relates to a process for recovering oil from an oil-bearing stratum utilizing steam injection.

In the huff and puff method of steam stimulation for oil wells, there is a soaking period during which heat is transferred by conduction from the steam invaded area deeper into the stratum surrounding the injection well. In the Morichal Field in Venezuela, which contains a heavy viscous crude oil, the normal steam injection period is about 21 days, and this is followed by a soak period of about six day-s after which the well is put on flow or pump. These injection and soak periods will vary substantially, depending upon the characteristics of the oil stratum in which the butt and puif steam method is applied. During the soaking period the steam contained in the steam invaded area condenses. This causes a flow of fluids from the stratum toward the steam zone, thereby decreasing the rate at which heat flows by conduction into the stratum away from the injection well. During the soaking period the well bore remains very hot and in the event it is necessary to service the well, it must first be killed with water to lower its temperature at a considerable loss of thermal energy.

The instant invention provides a simple procedure for minimizing both of the foregoing problems.

Accordingly, the principal object of the invention is to provide an improved huff aand puff method of producing oil from an oil stratum using steam as the heat stimulation medium. Another object is to provide a huff and puff steam stimulation method which prevents flow of fluids toward the injection well during the soak period. A further object of the invention is to provide a steam injection butt and puff method for oil recovery which substantially decreases the downhole temperature during the soaking period without susbtantial loss of thermal energy. Other objects of the invention will become apparent to one skilled in the art upon consideration of the accompanying disclosure.

In accordance with the invention, a volatile liquid is injected into the injection Well in a huff and puff steam operation during the soaking period, whereby the volatile liquid is volatilized so as to cool the well bore downhole and create pressure in the surrounding stratum which maintains the pressure built up by the steam injection as steam condenses in the steam invaded area during the soaking period. Thus, at the end of the steam injection period, a liquid more volatile than water is injected into the well so that the heat stored in the stratum adjacent the well vaporizes the injected liquid and creates additional pressure downhole to compensate for the loss of pressure due to steam condensation in the steam invaded area. This technique has the effect of pushing the steam zone deeper into the stratum than is the case without the injection of volatile liquid.

The volatile liquid injected subsequent to the steam injection comprises any non-deleterious liquid more volatile than water. Examples of volatile liquids having utility in the process are propane, butane, LP Gas, natural gasoline, and other hydrocarbons of high volatility. Liquids other than hydrocarbons such as alcohols are also cflective in the process.

The rate of injection of the volatile liquid is controlled so as to maintain the pressure within the stratum adjacent the well bore at least as high, and preferably higher, than the stratum pressure in the end of the steam injection phase of the operation. In one embodiment of the invention, propane or other highly volatile liquid is injected at a sufiicient rate to maintain the well bore pressure slightly above that of the stratum to prevent flow of fluids toward the Well during the soaking period. When the well is open to production after the soaking period during the puff stage, the propane or other injected liquid is produced and condensed above ground for re-use in the process.

It is also feasible to inject a mixture of propane, or other volatile liquid, and water in order to reduce the volume of volatile liquid required and the cost of the operation. The water is also volatilized and helps dissolve heavy oxidized products in the startum. In the first test of the huff and puff method in the Morichal Field, the well would not flow after the soak period because of deposits of oxidized hydrocarbons. After the well was placed on pump and the oxidized products immediately around the well removed, the well reached a maximum production level far in excess of that experienced prior to the steam injection. The amount of volatile liquid to be injected during the soak period will usually vary from about 5 barrels to 500 barrel-s, depending upon the characteristic of the stratum, the quantity of steam injection, the pressure built up in the stratum, the length of the huff period, etc.

A more complete understanding of the invention may be had by reference to the accompanying schematic drawing which is an elevation through a well penetrating a heavy crude oil stratum with equipment for performing the process of the invention.

Referring to the drawing, a stratum 10 is penetrated by a well 12 which is provided with a casing 14 and a tubing string 16. A packer 18 is positioned around tubing 16 so as to seal off the annulus 20 and restrict the injected fluids to the stratum 10. The casing 14 is provided with perforations 22 below packer 18.

A boiler 24 is provided above ground and a steam line 26 containing a control valve 28 connects the boiler with tubing string 16 through line 29 and valve 30. A volatile liquid supply tank 32 is connected by line 34 with line 29 and contains a valve 35 and a pump 36 for forcing volatile liquid into tubing string 16. Production line 37 containing valve 39 connects with tubing string 16 for recovery of oil during the puff stage of the process.

In the huff and puff method, steam from boiler 24 is forced into the stratum through tube 16 for a substantial period of time so as to cause the steam to invade an annular section of the stratum 38 which may extend out a distance in the range of 5 to 20 feet or more, initially. Steam injection is terminated and volatile liquid is injected from tank 32 by the means shown in the drawing so as to provide a mass of liquid 40 downhole. Thus, liquid vaporizes and the vapor invades the stratum behind the steam, pushing the steam and heated zone deeper into the stratum. While the drawing illustrates the volatile liquid in liquid form downhole, the injection of volatile liquid may be controlled at a rate such that it is volatilized as fast as it is introduced downhole.

After a substantial soak period during which volatile liquid is vaporized to maintain the pressure in the stratum and prevent flow of fluids toward the well, the well is opened to flow whereby fluids, including oil made less viscous by the heating provided, flow into the well and are forced up tubing 16 and into production line 37 containing valve 39 from which the fluids pass to conventional recovery means not shown. It is also feasible to position a pump on tubing 16 in the event the pressure downhole is insuflicient to produce the fluids at an adequate rate.

The hulf phase (steam injection), the soak phase, and the putt phase (production phase) are repeated so as to extend the heated zone deeper into the stratum, opening e3 up more stratum to production and recovering more oil therefrom. The process of the invention may be effected around a plurality of wells in any d;sired well pattern, either simultaneously or consecutively, so as to open up the stratum within the well pattern to relatively high fluid flow rates so that a direct steam drive between wells can be effected, or either a direct or inverse in situ combustion drive can be utilized to produce further quantities of oil from the stratum.

During the butt phase of the process, steam, which may range in temperature from about 350 to 700 F. or higher, substantially heats the borehole wall from ground level down thru the tubing, annulus and easing, most of this heat is transferred to the stratum during injection of volatile liquid by vaporization of the liquid in the tubing and downhole area and movement thereof into the steaminvaded area of the stratum where at least a portion of the vapor condenses. Thus heat from the borehole and stratum immediately surrounding the borehole is cooled by vaporization of the injected liquid and the heat lost is delivered to the stratum more remote from the borehole and steam and hot condensate deeper into the stratum.

Generally, the longer the huff period and the higher the steam temperature, the larger the volume of volatile liquid can be injected effectively. Larger volumes of injected liquid promote more heat drive into the stratum.

Certain modifications of the invention will become apparent to those skilled in the art and the illustrative details disclosed are not to be construed as imposing unnecessary limitations on the invention.

I claim:

1. A process for producing oil from a permeable oil stratum penetrated by a well which comprises the steps of:

(l) injecting steam into said stratum thru said well for a substantial period to heat said stratum and build up pressure therein;

(2) terminating the injection of steam and injecting into said stratum a liquid more volatile than water which is volatile at downhole temperature;

(3) maintaining said well closed in for a substantial soaking period so as to vaporize at least a substantial portion of the liquid injected in step 2 and drive heat deeper into said stratum from said well; and

(4) thereafter, opening said well to flow and producing oil therefrom.

2. The process of claim 1 wherein said liquid comprises low-boiling hydrocarbon.

3. The process of claim 2 wherein said hydrocarbon comprises essentially propane.

4. The process of claim 2 wherein said hydrocarbon comprises essentially butane.

5. The process of claim 2 wherein said hydrocarbon comprises essentially natural gasoline.

6. The process of claim 2 wherein said hydrocarbon comprises essentially LP gas.

7. The process of claim 1 wherein low-boiling hydrocarbon and water are injected in step 2.

8. A process for producing oil from a permeable straturn containing a viscous oil and penetrated by a well, which comprises the steps of:

(1) injecting steam at a temperature of at least 350 F. into said stratum thru said well for a substantial period so as to heat and pressurize said stratum;

(2) terminating steam injection and injecting low-boiling liquid hydrocarbon into said well so that said hydrocarbon is vaporized downhole and maintains pressure in said well, thereby preventing any substantial flow of fluids toward said well;

(3) terminating step 2 after a substantial period and opening said well to flow of fluids, thereby producing oil in said well; and

(4) recovering the fluids, including oil, from said well.

9. The process of claim 8 wherein injection in step 2 is controlled so as to maintain substantially the pressure existing in said stratum at the end of step 1.

10. The process of claim 8 wherein a hydrocarbon liquid of intermediate volatility is introduced for a substantial period .in step (2) and a liquid hydrocarbon of high volatility is thereafter introduced for substantial period.

11. The process of claim 10 wherein the liquid of intermediate volatility is natural gasoline and that of high volatility is LP gas.

FOREIGN PATENTS 8/1939 Great Britain.

CHARLES E. OCONNELL, Primary Examiner.

STEPHEN J. NOVOSAD, Examiner.

Claims (1)

1. A PROCESS FOR PRODUCING OIL FROM A PERMEABLE OIL STRATUM PENETRATED BY A WELL WHICH COMPRISES THE STEPS OF: (1) INJECTING STEAM INTO SAID STRATUM THRU SAID WELL FOR A SUBSTANTIAL PERIOD TO HEAT SAID STRATUM AND BUILD UP PRESSURE THEREIN; (2) TERMINATING THE INJECTION OF STEAM AND INJECTING INTO SAID STRATUM A LIQUID MORE VOLATILE THAN WATER WHICH IS VOLATILE AT DOWNHOLE TEMPERATURE; (3) MAINTAINING SAID WELL CLOSED IN FOR A SUBSTANTIAL SOAKING PERIOD SO AS TO VAPORIZE AT LEAST A SUBSTANTIAL PORTION OF THE LIQUID INJECTED IN STEP 2 AND DRIVE HEAT DEPPER INTO SAID STRATUM FROM SAID WELL; AND (4) THEREAFTER, OPENING SAID WELL TO FLOW AND PRODUCING OIL THEREFROM.
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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3405761A (en) * 1967-05-12 1968-10-15 Phillips Petroleum Co Steam flooding oil-bearing limestone strata
US3420298A (en) * 1967-08-04 1969-01-07 Phillips Petroleum Co Avoiding casing damage during direct steam drive oil production
US3434544A (en) * 1966-12-22 1969-03-25 Pan American Petroleum Corp Method for conducting cyclic steam injection in recovery of hydrocarbons
US3455392A (en) * 1968-02-28 1969-07-15 Shell Oil Co Thermoaugmentation of oil production from subterranean reservoirs
US3459265A (en) * 1967-07-28 1969-08-05 Pan American Petroleum Corp Method for recovering viscous oil by steam drive
US3500931A (en) * 1968-08-20 1970-03-17 Tenneco Oil Co Method for heating an oil reservoir by injecting alternate slugs of steam and higher specific heat material
US3524502A (en) * 1969-02-03 1970-08-18 Tenneco Oil Co Steam injection method for producing oil
US3782470A (en) * 1972-08-23 1974-01-01 Exxon Production Research Co Thermal oil recovery technique
US3954141A (en) * 1973-10-15 1976-05-04 Texaco Inc. Multiple solvent heavy oil recovery method
US3994345A (en) * 1974-12-05 1976-11-30 Phillips Petroleum Company Method of recovering oil using steam
US4004636A (en) * 1975-05-27 1977-01-25 Texaco Inc. Combined multiple solvent and thermal heavy oil recovery
US4280559A (en) * 1979-10-29 1981-07-28 Exxon Production Research Company Method for producing heavy crude
US4399868A (en) * 1981-09-30 1983-08-23 Shell Oil Company Unplugging brine-submerged perforations
US4465138A (en) * 1981-12-16 1984-08-14 Mobil Oil Corporation Cyclic thermal solvent recovery method utilizing visbroken produced crude oil
USRE38642E1 (en) * 1993-01-04 2004-11-02 Halliburton Energy Services, Inc. Downhole equipment, tools and assembly procedures for the drilling, tie-in and completion of vertical cased oil wells connected to liner-equipped multiple drainholes
US20110067858A1 (en) * 2009-09-24 2011-03-24 Conocophillips Company Fishbone well configuration for in situ combustion
US20120234537A1 (en) * 2010-09-14 2012-09-20 Harris Corporation Gravity drainage startup using rf & solvent
US20150345271A1 (en) * 2014-05-29 2015-12-03 Quinn Solutions Inc. Apparatus, system, and method for controlling combustion gas output in direct steam generation for oil recovery
US9249649B2 (en) * 2011-12-06 2016-02-02 Halliburton Energy Services, Inc. Bidirectional downhole fluid flow control system and method

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB511768A (en) * 1937-11-19 1939-08-24 Mark Benson Improvements in or relating to extraction of petroleum
US2862558A (en) * 1955-12-28 1958-12-02 Phillips Petroleum Co Recovering oils from formations
US3042114A (en) * 1958-09-29 1962-07-03 Company Jersey Produc Research Process for recovering oil from underground reservoirs
US3064728A (en) * 1960-01-04 1962-11-20 California Research Corp Heavy oil production by thermal methods
US3126961A (en) * 1964-03-31 Recovery of tars and heavy oils by gas extraction
US3131759A (en) * 1959-06-19 1964-05-05 Socony Mobil Oil Co Inc Method of treating oil-productive subterranean formations
US3259186A (en) * 1963-08-05 1966-07-05 Shell Oil Co Secondary recovery process
US3266569A (en) * 1962-09-14 1966-08-16 Marathon Oil Co Recovery of viscous unsaturated crude by intermittent gas injection

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3126961A (en) * 1964-03-31 Recovery of tars and heavy oils by gas extraction
GB511768A (en) * 1937-11-19 1939-08-24 Mark Benson Improvements in or relating to extraction of petroleum
US2862558A (en) * 1955-12-28 1958-12-02 Phillips Petroleum Co Recovering oils from formations
US3042114A (en) * 1958-09-29 1962-07-03 Company Jersey Produc Research Process for recovering oil from underground reservoirs
US3131759A (en) * 1959-06-19 1964-05-05 Socony Mobil Oil Co Inc Method of treating oil-productive subterranean formations
US3064728A (en) * 1960-01-04 1962-11-20 California Research Corp Heavy oil production by thermal methods
US3266569A (en) * 1962-09-14 1966-08-16 Marathon Oil Co Recovery of viscous unsaturated crude by intermittent gas injection
US3259186A (en) * 1963-08-05 1966-07-05 Shell Oil Co Secondary recovery process

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3434544A (en) * 1966-12-22 1969-03-25 Pan American Petroleum Corp Method for conducting cyclic steam injection in recovery of hydrocarbons
US3405761A (en) * 1967-05-12 1968-10-15 Phillips Petroleum Co Steam flooding oil-bearing limestone strata
US3459265A (en) * 1967-07-28 1969-08-05 Pan American Petroleum Corp Method for recovering viscous oil by steam drive
US3420298A (en) * 1967-08-04 1969-01-07 Phillips Petroleum Co Avoiding casing damage during direct steam drive oil production
US3455392A (en) * 1968-02-28 1969-07-15 Shell Oil Co Thermoaugmentation of oil production from subterranean reservoirs
US3500931A (en) * 1968-08-20 1970-03-17 Tenneco Oil Co Method for heating an oil reservoir by injecting alternate slugs of steam and higher specific heat material
US3524502A (en) * 1969-02-03 1970-08-18 Tenneco Oil Co Steam injection method for producing oil
US3782470A (en) * 1972-08-23 1974-01-01 Exxon Production Research Co Thermal oil recovery technique
US3954141A (en) * 1973-10-15 1976-05-04 Texaco Inc. Multiple solvent heavy oil recovery method
US3994345A (en) * 1974-12-05 1976-11-30 Phillips Petroleum Company Method of recovering oil using steam
US4004636A (en) * 1975-05-27 1977-01-25 Texaco Inc. Combined multiple solvent and thermal heavy oil recovery
US4280559A (en) * 1979-10-29 1981-07-28 Exxon Production Research Company Method for producing heavy crude
US4399868A (en) * 1981-09-30 1983-08-23 Shell Oil Company Unplugging brine-submerged perforations
US4465138A (en) * 1981-12-16 1984-08-14 Mobil Oil Corporation Cyclic thermal solvent recovery method utilizing visbroken produced crude oil
USRE38642E1 (en) * 1993-01-04 2004-11-02 Halliburton Energy Services, Inc. Downhole equipment, tools and assembly procedures for the drilling, tie-in and completion of vertical cased oil wells connected to liner-equipped multiple drainholes
US20110067858A1 (en) * 2009-09-24 2011-03-24 Conocophillips Company Fishbone well configuration for in situ combustion
US8381810B2 (en) 2009-09-24 2013-02-26 Conocophillips Company Fishbone well configuration for in situ combustion
US20120234537A1 (en) * 2010-09-14 2012-09-20 Harris Corporation Gravity drainage startup using rf & solvent
US8978755B2 (en) * 2010-09-14 2015-03-17 Conocophillips Company Gravity drainage startup using RF and solvent
US9249649B2 (en) * 2011-12-06 2016-02-02 Halliburton Energy Services, Inc. Bidirectional downhole fluid flow control system and method
US20150345271A1 (en) * 2014-05-29 2015-12-03 Quinn Solutions Inc. Apparatus, system, and method for controlling combustion gas output in direct steam generation for oil recovery
US9447667B2 (en) * 2014-05-29 2016-09-20 Quinn Solutions Inc. Apparatus, system, and method for controlling combustion gas output in direct steam generation for oil recovery
US20160290628A1 (en) * 2014-05-29 2016-10-06 Quinn Solutions Inc. Apparatus, system, and method for controlling combustion gas output in direct steam generation for oil recovery
US9702543B2 (en) * 2014-05-29 2017-07-11 Qsi Technologies Inc. Method for controlling combustion gas output in direct steam generation for oil recovery

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