Drilling type underwater horizontal Christmas tree and wellhead system

Abstract

The invention relates to a drilling type underwater horizontal Christmas tree and wellhead system. The drilling type underwater horizontal Christmas tree and wellhead system comprises a drilling type underwater Christmas tree, an underwater wellhead system and an underwater blowout preventer unit, wherein the underwater wellhead system comprises a guide pipe head, a high-pressure wellhead head, a drilling type conversion connector and a casing hanger which are arranged in sequence from outside to inside in a sleeving mode, the lower end of the guide pipe head is connected with a guide pipe, the lower end of the high-pressure wellhead head is connected with a surface casing, the lower end of the drilling type conversion connector is connected with an intermediate casing, the lower end of the casing hanger is connected with a production casing, and the guide pipe, the surface casing, the intermediate casing and the production casing are arranged in sequence from outside to inside in the sleeving mode; and the lower end of the drilling type underwater Christmas tree is connected with the upper end of the high-pressure wellhead head of the underwater wellhead system, and the upper end of the drilling type underwater Christmas tree is connected with the lower end of the underwater blowout preventer unit. The drilling type underwater horizontal Christmas tree and wellhead system has the passing capacity of a 12-1 / 4" drill bit, and the underwater blowout preventer unit only needs to be installed once in the installation process, so that the installation operation efficiency and the project economy are obviously improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a drill-through underwater horizontal Christmas tree and wellhead system. Background technique [0002] The underwater horizontal Christmas tree equipment needs to be installed on a drilling platform, and the equipment installation cost may even exceed the equipment purchase cost. The equipment purchase cost and the equipment installation cost are roughly the same for the application within 600 meters, but when the application water depth reaches 2000 meters, the equipment installation cost will be twice the equipment purchase cost. The main reason is that the installation process of the underwater horizontal tree needs to be installed Two underwater blowout preventer sets, based on the comprehensive daily cost of the drilling platform, is about 1 million US dollars, and the installation time of a single underwater blowout preventer set in 2 to 4 days will cost a...

AI Technical Summary

Problems solved by technology

The equipment purchase cost and the equipment installation cost are roughly the same for the application within 600 meters, but when the application water depth reaches 2000 meters, the equipment installation cost will be twice the equipment purchase cost. The main reason is that the installation process of the underwater horizontal tree needs to be installed Two underwater blowout preventer groups, based on the comprehensive daily cost of the drilling platform, is about 1 million U.S. dollars, and the installation time of a single underwater BOP group in 2 to 4 days will cost about 2 to 4 million U.S. dollars, so the installation cost is extremely high. High, which will seriously affect the economics of deepwater oil and gas field development

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