[특허]System and method for mapping deep anomalous zones of electrical resistivity

GroundMetrics, Inc.

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내보내기 페이스북 공유 트위터 공유 카카오톡 공유

System and method for mapping deep anomalous zones of electrical resistivity

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01V-003/00 G01V-003/02 G01V-003/24 G01V-003/20 E21B-047/12 E21B-017/00 E21B-049/00
출원번호	US-0119064 (2015-02-13)
등록번호	US-9823379 (2017-11-21)
국제출원번호	PCT/US2015/015805 (2015-02-13)
국제공개번호	WO2015/123515 (2015-08-20)
발명자 / 주소	Morrison, H. Frank
출원인 / 주소	GroundMetrics, Inc.
대리인 / 주소	Diederiks & Whitelaw, PLC
인용정보	피인용 횟수 : 0 인용 특허 : 9

초록
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A system and method are provided for delivering current to a lower exposed end of a well in which a source of current is connected to a middle section of a well casing or tubing inserted in the casing with the middle section being electrically isolated from a first or upper section by an insulative coupler and treated to be electrically resistive. A cable is attached to the middle section and used to deliver current along the wall of the middle section to the lower exposed end such that the lower exposed end is used to generate an electric field in nearb...

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1. A system for transmitting an electric current from a bottom section of a well comprising: a well conduit including a first segment proximate a well head, a second segment including an inner portion which is electrically conductive and an outer portion which is electrically resistive, and a third segment which is located at or near the bottom section of the well and is electrically conductive;a power source for providing the electric current;an electrical connection between the power source and the inner portion of the second segment for transmitting the electric current from the power source to the second segment, through the second segment to the third segment, and into nearby geological zones from the third segment; andsurface sensors located at the Earth's surface configured to sense changes in electric fields generated utilizing the third segment as a downhole electrode, with the changes resulting from a nature of materials in a vicinity of the well, and wherein the system is configured to detect or delineate subsurface features based on the changes. 2. The system according to claim 1, further comprising: an insulative coupler interposed between said first segment and said second segment, said insulative coupler being formed from a non-conductive material, wherein the first segment is electrically isolated from the electric current by the insulative coupler. 3. The system according to claim 2, wherein the electrical connection is made through an electrically insulated cable connected to the second segment proximate the insulative coupler. 4. The system according to claim 3, wherein the electrical connection to the second segment is made directly adjacent said insulative coupler. 5. The system according to claim 3, wherein the outer portion of the second segment is treated to be electrically resistive in order to limit dissipation of the electric current to around the well along the second segment. 6. The system according to claim 5, wherein the outer portion is treated to include an electrically resistive coating. 7. The system according to claim 6, wherein the outer electrically resistive coating is constituted by a corrosion resistive material. 8. The system according to claim 7, wherein the outer electrically resistive coating includes a polymeric resin. 9. The system according to claim 8, wherein the polymeric resin comprises an epoxy resin. 10. The system according to claim 2, wherein the non-conductive material of said insulative coupler includes fiberglass. 11. The system according to claim 2, wherein the non-conductive material of said insulative coupler includes a resin impregnated Kevlar. 12. The system according to claim 2, wherein the insulative coupler includes an inner threaded ring threadably attached to one of the second segment or the third segment. 13. The system according to claim 12, wherein the inner threaded ring is made of steel. 14. The system according to claim 1, wherein each of the first, second and third segments constitute portions of a well casing. 15. The system according to claim 14, wherein the outer portion of the second segment is treated to be electrically resistive in order to limit dissipation of the electric current to around the well along the second segment. 16. The system according to claim 1, wherein each of the first, second and third segments constitute portions of a tubing inserted into a well casing. 17. A method for transmitting an electric current from a bottom section of a well comprising: connecting, below a first, upper segment of a well conduit, a current source to an electrically conductive inner portion of a second, lower segment of the well conduit, with the second segment also including an outer portion which is electrically resistive;providing electric current from the current source to the inner portion of the second segment such that the electric current travels from the current source through the second segment to an electrically conductive bottom segment of said well conduit;transmitting the electric current from the bottom segment into nearby geological zones;sensing changes in electric fields generated utilizing the bottom segment as a downhole electrode, with the changes resulting from a nature of materials in a vicinity of the well, at the Earth's surface by surface sensors; anddetecting or delineating subsurface features based on the changes. 18. The method of claim 17, further comprising: interconnecting the first segment to the second segment with an insulative coupler made from a non-conductive material, wherein the first segment is electrically isolated from the electric current by the insulative coupler. 19. The method of claim 18, further comprising: providing the electric current to the inner portion of the second segment directly adjacent the insulative coupler. 20. The method of claim 17, further comprising: treating the outer portion of the second segment to be electrically resistive. 21. The method of claim 20, wherein treating the outer portion includes coating the outer portion of the second segment with an electrically resistive material to limit dissipation of the electric current to around the well along the second segment. 22. The method of claim 21, wherein coating with the electrically resistive material also makes the outer portion of the second segment corrosion resistant. 23. The method of claim 17, wherein the well conduit is a production casing. 24. The method of claim 17, wherein the well conduit is a tubing inserted into a well casing.

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System and method for mapping deep anomalous zones of electrical resistivity

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System and method for mapping deep anomalous zones of electrical resistivity

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