Method for replacing wellhead and wellhead accessories under pressure
The invention discloses a method for replacing a well mouth and well mouth accessories under pressure. The method comprises the steps that S1, safety evaluation is conducted on a pre-construction well; s2, a wellhead square pit is dug, and a freezing box 3 is placed; s3, installing a high-pressure i...
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| creator | XU GUOCHEN SHI KAI SHEN JI LIANG ZHEN DUAN YUTAO HAN CHAO LIU XIAOWEN LIN GANG LYU HAIWEI WANG BO |
| description | The invention discloses a method for replacing a well mouth and well mouth accessories under pressure. The method comprises the steps that S1, safety evaluation is conducted on a pre-construction well; s2, a wellhead square pit is dug, and a freezing box 3 is placed; s3, installing a high-pressure injection device 1 in a standardized manner, and connecting a high-pressure injection pipeline; s4, a refrigerant is added into the freezing box 3, and a temporary plugging agent is injected into the freezing box 3; s5, freezing slug positive/negative pressure testing; s6, a wellhead or wellhead accessories are replaced, and pressure testing is conducted; and S7, unfreezing the well mouth and recovering the original appearance of the well site. The well mouth hidden danger treatment mode is suitable for oil/gas/water wells, well killing is not needed in the operation process, open flow is not needed, a large amount of operation liquid is not generated, operation equipment is few, and the occupied area is small.
本发明公 |
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本发明公</description><subject>EARTH DRILLING</subject><subject>EARTH DRILLING, e.g. DEEP DRILLING</subject><subject>FIXED CONSTRUCTIONS</subject><subject>MINING</subject><subject>OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2024</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZHD1TS3JyE9RSMsvUihKLchJTM7MS1coT83JyUhNTFFIzEtB4iQnpxYX5xdlphYrlOalpBYpFBQBBUqLUnkYWNMSc4pTeaE0N4Oim2uIs4duakF-fGpxQWJyal5qSbyzn6GhuYmJpbmFhaMxMWoACUczlQ</recordid><startdate>20240126</startdate><enddate>20240126</enddate><creator>XU GUOCHEN</creator><creator>SHI KAI</creator><creator>SHEN JI</creator><creator>LIANG ZHEN</creator><creator>DUAN YUTAO</creator><creator>HAN CHAO</creator><creator>LIU XIAOWEN</creator><creator>LIN GANG</creator><creator>LYU HAIWEI</creator><creator>WANG BO</creator><scope>EVB</scope></search><sort><creationdate>20240126</creationdate><title>Method for replacing wellhead and wellhead accessories under pressure</title><author>XU GUOCHEN ; SHI KAI ; SHEN JI ; LIANG ZHEN ; DUAN YUTAO ; HAN CHAO ; LIU XIAOWEN ; LIN GANG ; LYU HAIWEI ; WANG BO</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_CN117449788A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>chi ; eng</language><creationdate>2024</creationdate><topic>EARTH DRILLING</topic><topic>EARTH DRILLING, e.g. DEEP DRILLING</topic><topic>FIXED CONSTRUCTIONS</topic><topic>MINING</topic><topic>OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS</topic><toplevel>online_resources</toplevel><creatorcontrib>XU GUOCHEN</creatorcontrib><creatorcontrib>SHI KAI</creatorcontrib><creatorcontrib>SHEN JI</creatorcontrib><creatorcontrib>LIANG ZHEN</creatorcontrib><creatorcontrib>DUAN YUTAO</creatorcontrib><creatorcontrib>HAN CHAO</creatorcontrib><creatorcontrib>LIU XIAOWEN</creatorcontrib><creatorcontrib>LIN GANG</creatorcontrib><creatorcontrib>LYU HAIWEI</creatorcontrib><creatorcontrib>WANG BO</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>XU GUOCHEN</au><au>SHI KAI</au><au>SHEN JI</au><au>LIANG ZHEN</au><au>DUAN YUTAO</au><au>HAN CHAO</au><au>LIU XIAOWEN</au><au>LIN GANG</au><au>LYU HAIWEI</au><au>WANG BO</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Method for replacing wellhead and wellhead accessories under pressure</title><date>2024-01-26</date><risdate>2024</risdate><abstract>The invention discloses a method for replacing a well mouth and well mouth accessories under pressure. The method comprises the steps that S1, safety evaluation is conducted on a pre-construction well; s2, a wellhead square pit is dug, and a freezing box 3 is placed; s3, installing a high-pressure injection device 1 in a standardized manner, and connecting a high-pressure injection pipeline; s4, a refrigerant is added into the freezing box 3, and a temporary plugging agent is injected into the freezing box 3; s5, freezing slug positive/negative pressure testing; s6, a wellhead or wellhead accessories are replaced, and pressure testing is conducted; and S7, unfreezing the well mouth and recovering the original appearance of the well site. The well mouth hidden danger treatment mode is suitable for oil/gas/water wells, well killing is not needed in the operation process, open flow is not needed, a large amount of operation liquid is not generated, operation equipment is few, and the occupied area is small.
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| 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 |
| title | Method for replacing wellhead and wellhead accessories under pressure |
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