검색연산자 | 기능 | 검색시 예 |
---|---|---|
() | 우선순위가 가장 높은 연산자 | 예1) (나노 (기계 | machine)) |
공백 | 두 개의 검색어(식)을 모두 포함하고 있는 문서 검색 | 예1) (나노 기계) 예2) 나노 장영실 |
| | 두 개의 검색어(식) 중 하나 이상 포함하고 있는 문서 검색 | 예1) (줄기세포 | 면역) 예2) 줄기세포 | 장영실 |
! | NOT 이후에 있는 검색어가 포함된 문서는 제외 | 예1) (황금 !백금) 예2) !image |
* | 검색어의 *란에 0개 이상의 임의의 문자가 포함된 문서 검색 | 예) semi* |
"" | 따옴표 내의 구문과 완전히 일치하는 문서만 검색 | 예) "Transform and Quantization" |
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) | E21B-037/06 |
미국특허분류(USC) | 166/369 ; 166/105 ; 166/902 |
출원번호 | US-0052997 (1987-05-22) |
발명자 / 주소 | |
인용정보 | 피인용 횟수 : 8 인용 특허 : 2 |
A gas anchor is attached to the lower end of a downhole pump located downhole in a borehole so that fluid must flow from the lower borehole, into the gas anchor, to the suction of the pump, and to the surface of the ground. The gas anchor has a metal rod located within an outer housing. An annulus is formed between the housing interior and the outer surface of the rod. Both the housing and rod are made of a special alloy. The housing has a multiplicity of ports formed therein. Formation fluid located in the bottom of the borehole flows through the ports,...
A downhole pump for use in a borehole which extends through a formation from which formation fluid flows into the borehole, said pump is located in said borehole and has a suction end for receiving formation fluid and an outlet end through which produced fluid flows into a tubing string and to the surface of the ground; the improvement comprising: a gas anchor attached to the suction end of the pump through which formation fluid must flow; said gas anchor a perforated housing and a core, said housing has attachment means at an upper end thereof by which...