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|국가/구분||United States(US) Patent 등록|
|국제특허분류(IPC7판)||E21B-019/00 E21B-033/03 E21B-043/26|
|발명자 / 주소||
|인용정보||피인용 횟수 : 35 인용 특허 : 2|
A bypass attachment is provided to prevent damage to the valves of a well tree when fluid at high pressure is passed into a well, such as during a fracturing process. The bypass attachment is formed of a piston rod removably mounted to the well tree and offset from it, a piston mounted on the piston rod, a cylinder movable on the piston, the cylinder bearing a piece of high-pressure tubing aligned with the passage through the well-head tree, a high-pressure valve to close off the high-pressure tubing and sealing means to seal the space between the exteri...
Apparatus for inserting high-pressure fluid through a well tree having a vertical passage therethrough including at least one valve and into a well having well tubing aligned with said vertical passage, which apparatus comprises: a piston rod removably mountable in a position offset from the vertical passage, a piston fixed to the piston rod, a cylinder movable on the piston, a piece of high-pressure tubing mounted for movement with one of the cylinder and the piston rod and said high-pressure tubing being positioned for axial alignment with said vertica...