IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0220372
(2001-03-02)
|
국제출원번호 |
PCT/US01/006951
(2001-03-02)
|
§371/§102 date |
20020830
(20020830)
|
국제공개번호 |
WO01/065055
(2001-09-07)
|
발명자
/ 주소 |
- Stegemeier,George Leo
- Vinegar,Harold J.
- Burnett,Robert Rex
- Savage,William Mountjoy
- Carl, Jr.,Frederick Gordon
- Hirsch,John Michele
|
출원인 / 주소 |
|
인용정보 |
피인용 횟수 :
152 인용 특허 :
87 |
초록
▼
A petroleum well having a well casing, a production tubing, a source of time-varying current, a downhole chemical injection device, and a downhole induction choke. The casing extends within a wellbore of the well. The tubing extends within the casing. The current source is located at the surface. T
A petroleum well having a well casing, a production tubing, a source of time-varying current, a downhole chemical injection device, and a downhole induction choke. The casing extends within a wellbore of the well. The tubing extends within the casing. The current source is located at the surface. The current source is electrically connected to, and adapted to output a time-varying current into, the tubing and/or the casing, which act as electrical conductors for providing downhole power and/or communications. The injection device having a communications and control module, a chemical container, and an electrically controllable chemical injector. The communications and control module is electrically connected to the tubing and/or the casing. The chemical injector is electrically connected to the communications and control module, and is in fluid communication with the chemical container. The downhole induction choke is located about a portion of the tubing and/or the casing. The chemical injector is electrically connected to the communications and control module, and is in fluid communication with the chemical container. The downhole induction choke is located about a portion of the tubing and/or the casing. The induction choke is adapted to route part of the electrical current through the communications and control module by creating a voltage potential between one side of the induction choke and another side of the induction choke. The communications and control module is electrically connected across the voltage potential. Also, a method is provided for controllably injecting a chemical into the well downhole, which may be used to: improve lift efficiency with a foaming agent, prevent deposition of solids with a paraffin solvent, improve a flow characteristic of the flow stream with a surfactant, prevent corrosion with a corrosion inhibitor, and/or prevent scaling with scale preventers.
대표청구항
▼
The invention claimed is: 1. A chemical injection system for use in a well, comprising: a current impedance device being generally configured for positioning about a portion of a piping structure of said well for supplying a time-varying electrical signal transmitted through and along said piping s
The invention claimed is: 1. A chemical injection system for use in a well, comprising: a current impedance device being generally configured for positioning about a portion of a piping structure of said well for supplying a time-varying electrical signal transmitted through and along said piping structure; and an electrically controllable chemical injection device adapted to be electrically connected to said piping structure, adapted to be powered by an electrical signal, and adapted to expel a chemical in response to an electrical signal. 2. A chemical injection system in accordance with claim 1, wherein said piping structure comprises at least a portion of a production tubing of said well. 3. A chemical injection system in accordance with claim 1, wherein said piping structure comprises at least a portion of a well casing. 4. A chemical injection system in accordance with claim 1, wherein said injection device comprises an electric motor and a communications and control module, said electrical motor being electrically connected to and adapted to be controlled by said communications and control module. 5. A chemical injection system in accordance with claim 1, wherein said injection device comprises an electrically controllable valve and a communications and control module, said electrically controllable valve being electrically connected to and adapted to be controlled by said communications and control module. 6. A chemical injection system in accordance with claim 1, wherein said injection device comprises a chemical reservoir and a chemical injector, said chemical reservoir being in fluid communication with said chemical injector, and said chemical injector being adapted to expel from said injection device chemicals from within said chemical reservoir in response to said electrical signal. 7. A chemical injection system in accordance with claim 1, wherein said electrical signal is a power signal. 8. A chemical injection system in accordance with claim 1, wherein said electrical signal is a communication signal. 9. A chemical injection system in accordance with claim 1, wherein said electrical signal is a control signal from a surface computer system. 10. A petroleum well for producing petroleum products, comprising: a piping structure positioned within the borehole of the well; a source of time-varying current electrically connected to said piping structure; an induction choke located about a portion of said piping structure; an electrically controllable chemical injection device coupled to said piping structure downhole in the borehole for receiving power and communication signals via said time-varying current and configured for injecting chemicals. 11. A petroleum well in accordance with claim 10, wherein said induction choke is unpowered and comprises a ferromagnetic material, such that said induction choke functions based on its size, geometry, spatial relationship to said piping structure, and magnetic properties. 12. A petroleum well in accordance with claim 10, wherein said piping structure comprises at least a portion of a production tubing, and an electrical return comprises at least a portion of a well casing. 13. A petroleum well in accordance with claim 10, wherein said piping structure comprises at least a portion of a well casing. 14. A petroleum well in accordance with claim 10, wherein said chemical injection device comprises an electrically controllable valve. 15. A petroleum well in accordance with claim 10, wherein said chemical injection device comprises an electric motor. 16. A petroleum well in accordance with claim 10, wherein said chemical injection device comprises a modem. 17. A petroleum well in accordance with claim 10, wherein said chemical injection device comprises a chemical reservoir. 18. A petroleum well in accordance with claim 17, wherein said chemical reservoir is positioned for injecting chemicals into the piping structure. 19. A petroleum well in accordance with claim 10, wherein said chemical injection device comprises a sensor. 20. A petroleum well for producing petroleum products comprising: a well casing extending within a wellbore of said well; a production tubing extending within said casing; a source of time-varying signals located at the surface, said signal source being electrically connected to, and adapted to output a time-varying signal into, at least one of said tubing and said casing; and a downhole chemical injection device comprising a communications and control module, a chemical container, and an electrically controllable chemical injector, said communications and control module being electrically connected to at least one of said tubing and said casing for receiving time-varying signals therefrom, said chemical injector being electrically connected to said communications and control module, and said chemical container being in fluid communication with said chemical injector. 21. A petroleum well in accordance with claim 20, wherein said chemical injector comprises an electric motor, a screw mechanism, and a nozzle, said electric motor being electrically connected to said communications and control module, said screw mechanism being mechanically coupled to said electric motor, said nozzle extending into an interior of said tubing, said nozzle providing a fluid passageway between said chemical container and said tubing interior, and screw mechanism being adapted to drive fluid out of said chemical container and into said tubing interior via said nozzle in response to a rotational motion of said electric motor. 22. A petroleum well in accordance with claim 20, wherein said chemical injector comprises a gas container filled with a pressurized gas, a pressure regulator, an electrically controllable valve, and a nozzle, and wherein an interior of said chemical container comprises a separator forming a first volume for containing a chemical and second volume, said gas container being in fluidly communication with said second chemical container interior volume via said pressure regulator such that pressurized gas can be in said second volume and outside of said first volume to exert pressure on said chemical in said first volume, said electrically controllable valve being electrically connected to said communications and control module for receiving power and control command signals therefrom, and said electrically controllable valve being adapted to regulate and control a passage of said chemicals from said first volume through said nozzle and into a tubing interior. 23. A petroleum well in accordance with claim 20, wherein said chemical container comprises a separator therein that divides an interior of said chemical container into two volumes, and wherein said chemical injector comprises an electrically controllable valve and a nozzle, a first of said chemical container interior volumes containing a chemical, a second of said chemical container interior volumes containing a pressurized gas such that said gas exerts pressure on said chemical in said first volume, said electrically controllable valve being electrically connected to and controlled by said communications and control module, and said first volume being fluidly connected to an interior of said tubing via said electrically controllable valve and via said nozzle. 24. A petroleum well in accordance with claim 20, wherein said chemical container comprises a separator therein that divides an interior of said chemical container into two volumes, and wherein said chemical injector comprises an electrically controllable valve and a nozzle, a first of said chemical container interior volumes containing a chemical, a second of said chemical container interior volumes containing a spring member such that said spring member exerts a force on said chemical in said first volume, said electrically controllable valve being electrically connected to and controlled by said communications and control module, and said first volume being fluidly connected to an interior of said tubing via said electrically controllable valve and via said nozzle. 25. A petroleum well in accordance with claim 20, wherein said chemical container is adapted to hold a pressurized chemical therein, and wherein said chemical injector comprises an electrically controllable valve and a nozzle, said electrically controllable valve being electrically connected to and controlled by said communications and control module, said nozzle extending into an interior of said tubing, said chemical container being fluidly connected to said tubing interior via said electrically controllable valve and via said nozzle. 26. A petroleum well in accordance with claim 20, wherein said chemical injector comprises an electric motor, a pump, a one-way valve, and a nozzle, said electric motor being electrically connected to and controlled by said communications and control module, said pump being mechanically coupled to said electric motor, said nozzle extending into an interior of said tubing, said chemical container being fluidly connected to said tubing interior via said pump, via said one-way valve, and via said nozzle. 27. A petroleum well in accordance with claim 20, further comprising a chemical supply tubing extending from the surface to the downhole chemical injection device, wherein said chemical container comprises a fluid passageway fluidly connecting said chemical supply tubing to an interior of said tubing via said chemical injector. 28. A petroleum well in accordance with claim 27, wherein said chemical container further comprises a chemical reservoir portion. 29. A petroleum well in accordance with claim 20, wherein said chemical container comprises a self-contained downhole fluid reservoir adapted to supply a chemical for said downhole chemical injection device. 30. A petroleum well in accordance with claim 20, including an unpowered induction choke comprising a ferromagnetic material. 31. A petroleum well in accordance with claim 20, the chemical container being configured for dispersing chemicals into at least one of the tubing or casing. 32. A petroleum well in accordance with claim 20, the chemical container being configured for dispersing chemicals into the formation external to the casing. 33. A petroleum well in accordance with claim 20, wherein said downhole injection device further comprises a sensor, said sensor being electrically connected to said communications and control module. 34. A petroleum well in accordance with claim 20, wherein said communications and control module comprises a modem. 35. A method of operating a petroleum well, comprising the steps of: providing a piping structure; providing a downhole chemical injection system for said well connected downhole to said piping structure, transmitting an AC signal on the piping structure to power and communicate with the downhole chemical injection system; and controllably injecting a chemical in response to an AC signal during operation. 36. A method in accordance with claim 35, wherein said well is a gas-lift well and said chemical comprises a foaming agent, and further comprising the step of improving an efficiency of artificial lift of said petroleum productions with said foaming agent. 37. A method in accordance with claim 35, wherein said chemical comprises a paraffin solvent and the piping structure includes tubing, and further comprising the step of hindering a deposition of solids on an interior of said tubing. 38. A method in accordance with claim 35, wherein said chemical comprises a surfactant, and further comprising the step of improving a flow characteristic of said flow stream. 39. A method in accordance with claim 35, wherein said chemical comprises a corrosion inhibitor, and further comprising the step of inhibiting corrosion in said well. 40. A method in accordance with claim 35, wherein said chemical comprises scale preventers, and further comprising the step of reducing scaling in said well. 41. A method in accordance with claim 35, wherein said chemical comprises fracturing compound, and further comprising the step of injecting said fracturing compound into the formation around said well.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.