WO1987003643A1 - Process for increasing the degree of oil extraction - Google Patents
Process for increasing the degree of oil extraction Download PDFInfo
- Publication number
- WO1987003643A1 WO1987003643A1 PCT/NO1986/000080 NO8600080W WO8703643A1 WO 1987003643 A1 WO1987003643 A1 WO 1987003643A1 NO 8600080 W NO8600080 W NO 8600080W WO 8703643 A1 WO8703643 A1 WO 8703643A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- oil
- formations
- reservoir
- water
- degree
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2401—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection by means of electricity
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/003—Vibrating earth formations
Definitions
- the present invention relates to a process for increasing the degree of extraction for oil or other volatile liquids in oil reservoirs on land or at sea by the aid of vibrations and heat. y the aid of electrical high-frequency pulses.
- the degree of re- covery can vary from approximately 17% and up to approximatel 50%.
- the degree of recovery from the EKOFISK field is, e.g. estimated at approximately 20%.
- a natural manner of increasing the degree of recovery would be to overcome the above mentioned binding forces with an in- crease of the pressure within the formations, and not with a pressure front of water or another expelling medium.
- the first part of the process has the object of establishing vibrations of an oil reservoir to achieve the same effect of the oil trapped in the formations.
- such evaporation of the oil may be achieved by heating the field by the aid of electrical high- frequency currents passing between the different wells that are commonly drilled from a production rig. Since there is always a little brine in an oil field and/or such brine can be supplied by injection and to the extend water break-through is achieved between the separate wells an electroconductive medium will be obtained which will act as an electrode furnace when electric energy is supplied. The resulting energy will cause evaporation of oil/water and will, thus, increase the pressure so that more oil can be recovered.
- Figure 1 shows a sectional view of an oil reservoir where several wells a have been drilled.
- mercury b or another heavy electroconductive liquid was poured into the lower portion of the well, where oil recovery takes place.
- the function of said liquid is both to conduct vibrations to the surrounding formations c, to conduct electric current from one well to another, and also to "flash" out oil/water, and possibly mud produced below liquid level d.
- a high-frequency vibrator is via a cable e provided in liquid b and is supplied with energy from the surface by a high- frequency convertor which is, in turn supplied with energy from a generator h. This energy is conducted down to said vibrator by conductors in the center of cable e. Said conduct- ors are surrounded by an insulator j onto which a conductor k is wound which is connected in an electroconductive manner to the surface 1 of said vibrator.
- Conductor k receives energy from a high-frequency convertor n which, -in turn, receives its energy from a generator o.
- Said generator and frequency convertor can supply- both single phase and polyphase current. In case of single phase curred each phase goes to a well and in case of three-phase current 3 wells are connected to phases R, S, T.
- Electric current may also be conducted down to the well through pipes s made from steel or another electroconductive material conventionally used for well liners. In this case only con ⁇ ductors for supplying energy to the vibrator itself by the aid of conductor i are required. Liquid b, also, does not have to be electroconductive in this case.
- Figure 2 shows an enlarged view of the lower portion of two wells p with an auxiliary well q, and an illustration of a break-through of water r.
- said vibrator When said vibrator receives energy it will oscillate the mercury b with vibrations adapted to the natural frequency of the formations, it will cause resonant vibrations in said form ⁇ ations which vibrations will propagate outwards and will, literally shake off the oil from the formations.
- the energy from vibrations will also supply the formations with heat as frictional heat between separate particles of the formation and between the formations and the oil flowing out, and it will contribute to maintaining the pressure by evaporating some oil and water.
- Figure 3 shows a sectional view of three wells indicating how vibrations t and the electric field u propagate between wells.
- Figure 4 is a sectional view of two wells indicating the "finger problem" that may arise when water is injected.
- Figure 5 shows a section of a well illustrating an arrangement comprising two vibrators and indicating the waves of vibration and the field lines from the electric voltage going down into the mercurv.
Abstract
A process for increasing the degree of extraction of oil or other volatile liquids in oil reservoirs on land or at sea, by making the formations in said reservoir vibrate as close to the natural frequency of said formations as possible, so that the binding forces between formations and oil are degraded and oil is, thus more easily recovered from the formations. Furthermore, the pressure in said reservoir is maintained by evaporating some oil and water in the reservoir, due to the fact that heating is achieved both as a consequence of said vibrations, and by the aid of electrical high frequency pulses causing the reservoir to perform like an electrode furnace.
Description
A process for increasing the degree of oil extraction
The present invention relates to a process for increasing the degree of extraction for oil or other volatile liquids in oil reservoirs on land or at sea by the aid of vibrations and heat. y the aid of electrical high-frequency pulses.
In connection with recovery of oil from any oil field only part of the oil present can be recovered. The degree of re- covery can vary from approximately 17% and up to approximatel 50%. The degree of recovery from the EKOFISK field is, e.g. estimated at approximately 20%.
The cause of the fact that it is not possible to recover all oil from a field, or at least a larger portion of such oil, i involved with the manner in which oil is bound in the format¬ ions. Oil in the pores of the formations is bound to said for ations by capillary forces, surface tensions, polar forces, and adhesive forces. At the beginning of oil production said binding energy will be overcome by the natural pressure pre¬ vailing in said oil reservoirs, but as this pressure graduall decreases said forces will exceed the expelling pressure, resulting in a decreased oil production even though most of the oil is left in the formations.
Considerable effort was made over the years and is still made to increase the degree of recovery, and the best known approach is to inject water into the reservoires. Additionall a series of chemicals was developed, all of them more or less intended for breaking up the adhesion forces between oil and formations. Besides being very expensive the known methods only contribute very little to increase the degree of recover E.g., the above mentioned degree of recovery is calculated after injection of water into the reservoir. Without such in- jection the degree of recovery is calculated to be approximat ly 17%.
Apart from the fact that a relatively small increase of the
degree of recovery is achieved, water injection requires ex¬ tensive control of injection wells. This is associated with the so called "finger problem" arising when water penetrates. The water front moving in the oil field will not appear as a sharp front, but rather like a front with extended "fingers", due to the fact that water will always seek to find the line of least resistance in the formation. This may be compared with observations made when water is spurted onto a mound of gravel. You will soon observe that the water digs depressions where water can pass. The hazard of water injection is that * such a "finger" reaches the production well. In that case only water will be produced from the injection. In order to over¬ come these problems much work is done to develop very sofist- icated computer models of these so called front movements in order to permit control of both volume and pressure of water to prevent break-through to production wells.
A natural manner of increasing the degree of recovery would be to overcome the above mentioned binding forces with an in- crease of the pressure within the formations, and not with a pressure front of water or another expelling medium.
It is an object of the present invention to disclose a process for achieving this aim on the basis of comprehension of the binding forces acting in a typical oil reservoir.
The process should state the necessary elements for achieving the intended effect and the technique used to this end.
From physics it is known that the frictional force between bodies will decrease dramatically if one body is rapidly moved normally to the direction of movement of the other body. This fact is, inter alia, used when certain instruments are support ed, i.e. a marker of an instrument for detecting some physical change is mounted on a slide bearing on a round rod. When said rod is rotated the frictional force between said bearing and rod will be approximately 0. The same effect may, indeed, be observed when we hit the cover of, e.g. an oil drum, if there
is a little sand and water on said cover. Both sand and water will "float" on the cover like small drops, and there is only a minimum force needed to blow the drops away.
The first part of the process has the object of establishing vibrations of an oil reservoir to achieve the same effect of the oil trapped in the formations.
So long as there is a natural pressure in the reservoir this will be enough to squeeze out considerably more oil than from a reservoir "in piece and quiet". Even though a considerably lower pressure is necessary to recover more oil from the field, sooner or later, there will be a limit of how much oil you can recover from the field. When the natural pressure disappears there are two conceivable manners of recovering oil - pumping by sucktion, which is e.g. used in socalled "nodding pumps" and/or creating a new pressure inside the reservoir.
Since there is still a considerable volume of oil remaining in the reservoir it represents a liquid which could, by evaporation, create the necessary internal pressure to in¬ crease the degree of recovery.
It is suggested that such evaporation of the oil may be achieved by heating the field by the aid of electrical high- frequency currents passing between the different wells that are commonly drilled from a production rig. Since there is always a little brine in an oil field and/or such brine can be supplied by injection and to the extend water break-through is achieved between the separate wells an electroconductive medium will be obtained which will act as an electrode furnace when electric energy is supplied. The resulting energy will cause evaporation of oil/water and will, thus, increase the pressure so that more oil can be recovered.
The process is now explained in more detail with reference to the drawing:
Figure 1 shows a sectional view of an oil reservoir where several wells a have been drilled. Into the lower portion of the well, where oil recovery takes place, mercury b or another heavy electroconductive liquid was poured. The function of said liquid is both to conduct vibrations to the surrounding formations c, to conduct electric current from one well to another, and also to "flash" out oil/water, and possibly mud produced below liquid level d.
A high-frequency vibrator is via a cable e provided in liquid b and is supplied with energy from the surface by a high- frequency convertor which is, in turn supplied with energy from a generator h. This energy is conducted down to said vibrator by conductors in the center of cable e. Said conduct- ors are surrounded by an insulator j onto which a conductor k is wound which is connected in an electroconductive manner to the surface 1 of said vibrator.
Conductor k receives energy from a high-frequency convertor n which, -in turn, receives its energy from a generator o. Said generator and frequency convertor can supply- both single phase and polyphase current. In case of single phase curred each phase goes to a well and in case of three-phase current 3 wells are connected to phases R, S, T.
Electric current may also be conducted down to the well through pipes s made from steel or another electroconductive material conventionally used for well liners. In this case only con¬ ductors for supplying energy to the vibrator itself by the aid of conductor i are required. Liquid b, also, does not have to be electroconductive in this case.
Figure 2 shows an enlarged view of the lower portion of two wells p with an auxiliary well q, and an illustration of a break-through of water r.
When said vibrator receives energy it will oscillate the mercury b with vibrations adapted to the natural frequency of
the formations, it will cause resonant vibrations in said form¬ ations which vibrations will propagate outwards and will, literally shake off the oil from the formations. The energy from vibrations will also supply the formations with heat as frictional heat between separate particles of the formation and between the formations and the oil flowing out, and it will contribute to maintaining the pressure by evaporating some oil and water.
When energy is supplied to the surface of vibrators it will be conducted outwards to the surrounding formations through the mercury and it will propagate further outwards in the field to next pair of poles in the next well. The same will happen if the current is conducted down into the well through the liners. Conductivity will increase if there is a break-through of water and this will, in fact, contribute to increase the development of heat in the formations. If the formations are such that it is impossible to achieve electrical contact between two product¬ ion wells p so called auxiliary wells may be drilled in which the same kind of vibrators/electric conductors are provided.
Figure 3 shows a sectional view of three wells indicating how vibrations t and the electric field u propagate between wells.
Figure 4 is a sectional view of two wells indicating the "finger problem" that may arise when water is injected.
Figure 5 shows a section of a well illustrating an arrangement comprising two vibrators and indicating the waves of vibration and the field lines from the electric voltage going down into the mercurv.
Claims
PATENT CLAIM:
A process for increasing the degree of recovery of oil from an oil reservoir, either used alone or as a supplement to 5. injection of water where brine is injected into the reservoir in so called injection wells, c h a r a c t e r i z e d i n that the formations in the reservoir, together with the oil in said reservoir are made to vibrate at the same time as heat is supplied.
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IN867/CAL/86A IN164735B (en) | 1985-12-03 | 1986-12-01 | |
BR8607011A BR8607011A (en) | 1985-12-03 | 1986-12-03 | PROCESS TO INCREASE THE DEGREE OF OIL EXTRACTION |
DE8686906967T DE3682902D1 (en) | 1985-12-03 | 1986-12-03 | METHOD FOR INCREASING THE DEGREE OF OIL EXTRACTION. |
UA4203126A UA15919A1 (en) | 1985-12-03 | 1986-12-13 | Method for increase of level of oil or other evaporated liquids extraction from oil beds in earth or at sea |
SU874203126A RU1838594C (en) | 1985-12-03 | 1987-07-31 | Method for increase of recovery ratio of oil of other volatile fluids from land and offshore oil reservoirs |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO854852 | 1985-12-03 | ||
NO854852A NO161697C (en) | 1985-12-03 | 1985-12-03 | PROCEDURE FOR INCREASING THE EXTRACTION RATE OF OIL OTHER VOLATILE LIQUIDS FROM OIL RESERVES. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1987003643A1 true WO1987003643A1 (en) | 1987-06-18 |
Family
ID=19888615
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NO1986/000080 WO1987003643A1 (en) | 1985-12-03 | 1986-12-03 | Process for increasing the degree of oil extraction |
Country Status (21)
Country | Link |
---|---|
US (1) | US4884634A (en) |
EP (1) | EP0249609B1 (en) |
JP (1) | JPS63502195A (en) |
CN (1) | CN1009672B (en) |
AR (1) | AR243966A1 (en) |
AU (1) | AU594402B2 (en) |
BR (1) | BR8607011A (en) |
CA (1) | CA1281058C (en) |
DE (1) | DE3682902D1 (en) |
DZ (1) | DZ1012A1 (en) |
EG (1) | EG17669A (en) |
IL (1) | IL80854A (en) |
IN (1) | IN164735B (en) |
MX (1) | MX170511B (en) |
MY (1) | MY100625A (en) |
NO (1) | NO161697C (en) |
NZ (1) | NZ218496A (en) |
RU (1) | RU1838594C (en) |
TR (1) | TR23787A (en) |
UA (1) | UA15919A1 (en) |
WO (1) | WO1987003643A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0676530A1 (en) * | 1992-12-28 | 1995-10-11 | Aktsionernoe Obschestvo Zakrytogo Tipa "Biotekhinvest" | Method of extracting gas from fluid-bearing strata |
CN107605472A (en) * | 2017-08-10 | 2018-01-19 | 中国石油天然气股份有限公司 | A kind of method and device for determining oil recovery |
US20220243572A1 (en) * | 2021-02-03 | 2022-08-04 | Ypf Tecnología S.A. | Method of oil recovery by impressed current |
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US5370477A (en) * | 1990-12-10 | 1994-12-06 | Enviropro, Inc. | In-situ decontamination with electromagnetic energy in a well array |
BR9102789A (en) * | 1991-07-02 | 1993-02-09 | Petroleo Brasileiro Sa | PROCESS TO INCREASE OIL RECOVERY IN RESERVOIRS |
US5460223A (en) * | 1994-08-08 | 1995-10-24 | Economides; Michael J. | Method and system for oil recovery |
US6227293B1 (en) | 2000-02-09 | 2001-05-08 | Conoco Inc. | Process and apparatus for coupled electromagnetic and acoustic stimulation of crude oil reservoirs using pulsed power electrohydraulic and electromagnetic discharge |
US6427774B2 (en) | 2000-02-09 | 2002-08-06 | Conoco Inc. | Process and apparatus for coupled electromagnetic and acoustic stimulation of crude oil reservoirs using pulsed power electrohydraulic and electromagnetic discharge |
US6619394B2 (en) | 2000-12-07 | 2003-09-16 | Halliburton Energy Services, Inc. | Method and apparatus for treating a wellbore with vibratory waves to remove particles therefrom |
JP4662232B2 (en) * | 2003-11-10 | 2011-03-30 | 鹿島建設株式会社 | Gas hydrate production method and system |
US7059413B2 (en) * | 2004-03-19 | 2006-06-13 | Klamath Falls, Inc. | Method for intensification of high-viscosity oil production and apparatus for its implementation |
US8113278B2 (en) | 2008-02-11 | 2012-02-14 | Hydroacoustics Inc. | System and method for enhanced oil recovery using an in-situ seismic energy generator |
US20090283257A1 (en) * | 2008-05-18 | 2009-11-19 | Bj Services Company | Radio and microwave treatment of oil wells |
EA017335B1 (en) * | 2009-09-18 | 2012-11-30 | Анатолий Яковлевич КАРТЕЛЕВ | Method of powering of electrodeischarge well devices |
US8230934B2 (en) * | 2009-10-02 | 2012-07-31 | Baker Hughes Incorporated | Apparatus and method for directionally disposing a flexible member in a pressurized conduit |
US8646527B2 (en) | 2010-09-20 | 2014-02-11 | Harris Corporation | Radio frequency enhanced steam assisted gravity drainage method for recovery of hydrocarbons |
RU2450119C1 (en) * | 2010-11-10 | 2012-05-10 | Общество с ограниченной ответственностью "СоНовита" (ООО "СоНовита") | Equipment complex for production of high-viscosity oil |
US8839856B2 (en) | 2011-04-15 | 2014-09-23 | Baker Hughes Incorporated | Electromagnetic wave treatment method and promoter |
WO2016167666A1 (en) | 2015-04-15 | 2016-10-20 | Resonator As | Improved oil recovery by pressure pulses |
WO2016187193A1 (en) * | 2015-05-19 | 2016-11-24 | Shell Oil Company | Method of treating a subterranean formation with a mortar slurry designed to form a permeable mortar |
RU2631451C1 (en) * | 2016-07-29 | 2017-09-22 | федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский ядерный университет МИФИ" (НИЯУ МИФИ) | Method to increase oil recovery of formation with high viscosity oil |
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-
1986
- 1986-11-29 MY MYPI86000156A patent/MY100625A/en unknown
- 1986-12-01 IN IN867/CAL/86A patent/IN164735B/en unknown
- 1986-12-02 CA CA000524269A patent/CA1281058C/en not_active Expired - Fee Related
- 1986-12-03 AU AU66297/86A patent/AU594402B2/en not_active Ceased
- 1986-12-03 WO PCT/NO1986/000080 patent/WO1987003643A1/en active IP Right Grant
- 1986-12-03 IL IL80854A patent/IL80854A/en unknown
- 1986-12-03 BR BR8607011A patent/BR8607011A/en not_active IP Right Cessation
- 1986-12-03 NZ NZ218496A patent/NZ218496A/en unknown
- 1986-12-03 CN CN86108326A patent/CN1009672B/en not_active Expired
- 1986-12-03 DE DE8686906967T patent/DE3682902D1/en not_active Expired - Fee Related
- 1986-12-03 DZ DZ860230A patent/DZ1012A1/en active
- 1986-12-03 AR AR86306076A patent/AR243966A1/en active
- 1986-12-03 JP JP61506332A patent/JPS63502195A/en active Granted
- 1986-12-03 EP EP86906967A patent/EP0249609B1/en not_active Expired - Lifetime
- 1986-12-03 TR TR86/0669A patent/TR23787A/en unknown
- 1986-12-03 MX MX004529A patent/MX170511B/en unknown
- 1986-12-03 EG EG751/86A patent/EG17669A/en active
- 1986-12-03 US US07/084,793 patent/US4884634A/en not_active Expired - Lifetime
- 1986-12-13 UA UA4203126A patent/UA15919A1/en unknown
-
1987
- 1987-07-31 RU SU874203126A patent/RU1838594C/en active
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0676530A1 (en) * | 1992-12-28 | 1995-10-11 | Aktsionernoe Obschestvo Zakrytogo Tipa "Biotekhinvest" | Method of extracting gas from fluid-bearing strata |
EP0676530A4 (en) * | 1992-12-28 | 1997-07-23 | N Proizv Biotekhinvest | Method of extracting gas from fluid-bearing strata. |
CN107605472A (en) * | 2017-08-10 | 2018-01-19 | 中国石油天然气股份有限公司 | A kind of method and device for determining oil recovery |
US20220243572A1 (en) * | 2021-02-03 | 2022-08-04 | Ypf Tecnología S.A. | Method of oil recovery by impressed current |
US11920447B2 (en) * | 2021-02-03 | 2024-03-05 | Ypf Tecnología S.A. | Method of oil recovery by impressed current |
Also Published As
Publication number | Publication date |
---|---|
NO161697C (en) | 1989-09-13 |
CA1281058C (en) | 1991-03-05 |
BR8607011A (en) | 1987-12-01 |
CN1009672B (en) | 1990-09-19 |
TR23787A (en) | 1990-09-13 |
NZ218496A (en) | 1989-05-29 |
EG17669A (en) | 1990-08-30 |
MY100625A (en) | 1990-12-29 |
IL80854A (en) | 1990-11-05 |
CN86108326A (en) | 1987-07-01 |
EP0249609B1 (en) | 1991-12-11 |
UA15919A1 (en) | 1997-06-30 |
AU6629786A (en) | 1987-06-30 |
JPS63502195A (en) | 1988-08-25 |
JPH0443560B2 (en) | 1992-07-16 |
NO854852L (en) | 1987-06-04 |
IN164735B (en) | 1989-05-20 |
DZ1012A1 (en) | 2004-09-13 |
IL80854A0 (en) | 1987-03-31 |
RU1838594C (en) | 1993-08-30 |
AR243966A1 (en) | 1993-09-30 |
EP0249609A1 (en) | 1987-12-23 |
DE3682902D1 (en) | 1992-01-23 |
NO161697B (en) | 1989-06-05 |
US4884634A (en) | 1989-12-05 |
MX170511B (en) | 1993-08-27 |
AU594402B2 (en) | 1990-03-08 |
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