Wellhead system for mining underwater resources

Abstract

The invention relates to a wellhead system for mining underwater resources. The wellhead system comprises a sleeve, a sleeve head and a suction pile, wherein the sleeve is used for mining the underwater sources; the sleeve head is arranged at the top end of the sleeve; the suction pile is arranged on the periphery of the sleeve in a covering mode; and a sleeve catcher is arranged at the upper end,covering the inner side of the periphery of the sleeve, of the suction pile, a locking structure matched with the sleeve catcher is arranged on the periphery of the sleeve, and the locking structureand a slope surface of the inner circumference of the upper end of the sleeve catcher realize structural matching through a slope surface of the periphery of the lower end of the locking structure toenable the locking structure to be matched with the sleeve catcher to form a ''double hanging'' structure for reducing water flow resistance when the sleeve moves downwards. According to the wellhead system for mining the underwater resources, the installation levelness can be controlled within + / -1degree, and well cementation is not needed, so that marine operating time is shortened; and the underwater wellhead system can be completely recycled, and using is quite convenient.

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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