Plug for master control valve pressure replacement for well head assembly

• Main Authors: JUNWEN YANG, YING XU, SHANGREN LIANG, GUOJUN YANG, CHAO YU, YINGQIANG LI, GUIRONG MA
• Format: Patent
• Language: English
• Published: 21.09.2005
• Edition: 7
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The utility model belongs to a plug device for master control valve pressure replacement for an oil or gas extraction wellhead device, which comprises a belt fixed head, a housing body, a bearing and a nut sleeve arranged in the housing body, a plug device main body of a hand wheel base, a screw pipe, a neck, a pressure testing and relief mechanism, a transitional fixing rack which comprises a fixed rod group, a fixed base and a fixed plate of the fixed rod and is fixedly connected with an oil pipe head in a removable type, a fixed clamp which can be arranged in the neck to connect the screw pipe with an outlet end flange of the oil pipe head for disassembling the master control valve, a cup ring adjusting rod and a cup ring. The utility model has the characteristics of convenient operation for valve replacement, safety, reliability, a wide application range, capability of construction under any pressure state, short construction time, low cost, no well killing downtime, no block for formation pores, etc., and overcomes the shortages of well killing downtime which leads to the block for the formation pores, or poor safety, difficult operation and use only for low pressure wellhead devices, or only partial maintenance for the master control valve and impossibility of valves change, etc. of background technique.