Wellhead systems for subsea resource extraction

Abstract

The present invention relates to a wellhead system for mining underwater resources, which includes: a casing, used for mining underwater resources; a casing head, arranged on the top of the casing; a suction pile, covered and arranged on the outer periphery of the casing; wherein, The suction pile is covered with a casing catcher at the inner upper end of the outer periphery of the casing, and the outer periphery of the casing is provided with a locking structure matched with the casing catcher structure. The slope surface of the inner circumference of the upper end of the device realizes structural cooperation, so that the locking structure and the casing catcher cooperate to form a "double suspension" structure that reduces the water flow resistance when the casing moves down. The wellhead system used for underwater resource exploitation provided by the present invention can be installed within ±1°; no cementing is required, so the working time at sea is saved; all underwater wellhead systems can be recycled, which is very convenient to use .

Description

technical field [0001] The invention relates to the technical field of underwater resource exploitation, in particular to a wellhead system for underwater resource exploitation. Background technique [0002] Conventional underwater oil and natural gas exploitation adopts the underwater wellhead system, which consists of multi-layer casing, wellhead base and wellhead head. It needs hundreds of meters of casing to be completely inserted into the seabed mud layer and cemented. There are three methods in this method: Defects: It is difficult to control the horizontality of the wellhead base installation, generally ±3°; the drilling and cementing operations take a long time, and the offshore operation cost is high; the recovery of the underwater wellhead system is difficult, and only the wellhead head and the wellhead base can be recovered Partially, the recycling rate is low. So it is necessary to design a new type of wellhead system for underwater resources exploitation. Con...

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Problems solved by technology

[0002] Conventional underwater oil and natural gas exploitation adopts the underwater wellhead system, which consists of multi-layer casing, wellhead base and wellhead head. It needs hundreds of meters of casing to be completely inserted into the seabed mud layer and cemented. There are three methods in this method: Defects: It is difficult to control the horizontality of the wellhead base installation, generally ±3°; the drilling and cementing operations take a long time, and the offshore operation cost is high; the recovery of the underwater wellhead system is difficult, and only the wellhead head and the wellhead base can be recovered part, low recycling rate

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