An underwater dry wellhead cabin suitable for offshore oil fields and its installation method

A technology for offshore oilfields and wellhead compartments, which is applied in earthwork drilling, wellbore/well components, sealing/isolation, etc. It can solve problems such as high technical threshold, complex equipment composition, high investment characteristics and reduced economic benefits of oilfields, etc., to achieve Reduced overall investment, low investment in operation and maintenance and workover operations, and improved construction safety

Active Publication Date: 2022-04-08
CNOOC ENERGY TECH & SERVICES
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] Nowadays, the underwater development methods of my country's offshore oilfields mostly use conventional underwater Christmas trees. The equipment composition is complex, the technical threshold is high, and foreign monopoly, and its high investment characteristics greatly reduce the economic benefits of the oilfield.

Method used

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  • An underwater dry wellhead cabin suitable for offshore oil fields and its installation method
  • An underwater dry wellhead cabin suitable for offshore oil fields and its installation method
  • An underwater dry wellhead cabin suitable for offshore oil fields and its installation method

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Embodiment Construction

[0037] The technical solutions of the invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the invention, not all of them. Based on the embodiments of the invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the invention.

[0038] As shown in the figure, the present invention provides an underwater dry wellhead tank suitable for offshore oil fields, including a guide base 1, a Christmas tree mechanism 2 and a mandrel mechanism 3, the guide base 1 is sleeved on the guide pipe, The Christmas tree mechanism 2 includes a cabin body 4, a Christmas tree body 5 and a wellhead head 6. The wellhead head 6 and the Christmas tree body 5 are coaxially sealed and connected, and the wellhead head 6 and the Christmas tree body 5 are arranged in the airtight cabin body 4. The wellh...

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Abstract

The invention provides an underwater dry-type wellhead cabin suitable for offshore oil fields and an installation method, and relates to the field of wellhead devices for offshore oil wells, including a guide base, a Christmas tree mechanism and a mandrel mechanism, and the guide base is sleeved on the guide pipe Above, the Christmas tree mechanism includes the cabin body, the Christmas tree body and the wellhead head. The wellhead head and the Christmas tree body are coaxially sealed and connected, and the wellhead head and the Christmas tree body are arranged in a closed cabin. The lower port of the wellhead head and the guide base The upper port of the Christmas tree body is sealed and connected. The upper port of the tree body is connected with the riser below the drilling through the wellhead connector. The wellhead head and the middle part of the tree body form a through oil delivery cavity. The connector is sealed and installed in the oil delivery cavity. The invention has the advantages of low construction difficulty, simple maintenance and low investment cost.

Description

technical field [0001] The invention relates to the field of wellhead devices for offshore oil wells, in particular to an underwater dry wellhead cabin suitable for offshore oil fields and an installation method. Background technique [0002] The Christmas tree is a wellhead device used to exploit oil such as self-flowing wells and mechanical production wells. It is the main equipment for controlling and regulating oil and gas production at the uppermost part of the oil and gas well. It mainly consists of three parts: casing head, tubing head and Christmas tree body. It has the following main functions: (1) Connect the casings of each layer downhole, seal the annular space of each layer of casings, and bear part of the weight of the casings. (2) Suspend tubing and downhole tools, support the weight of all tubing strings in the well, and seal the annular space between tubing and casing. (3) Control and regulate the production of oil wells. (4) Ensure the construction of va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/035E21B33/038
CPCE21B33/0353E21B33/0355E21B33/038E21B33/0385
Inventor 李艳莉童力李勇薄伟刘学涛王正文王玉山刘振平邹军华高建新张斌窦树霞王道广高洋张霖张伯欣刘振国王莉
Owner CNOOC ENERGY TECH & SERVICES
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