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Underwater Christmas tree installing method and system

A technology for underwater Christmas trees and installation methods, which is applied in the fields of production fluids, earthwork drilling, wellbore/well components, etc., and can solve the problems of difficulty in meeting the installation requirements of underwater Christmas trees, high daily rates of drilling platforms, and scarcity of resources, etc. question

Inactive Publication Date: 2017-01-11
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

[0003] At present, for the second mining method, the mainstream practice in the world is to use drilling platforms for operations, but the daily rate of using drilling platforms is too high, and resources are scarce, so it is difficult to meet the growing demand for underwater Christmas tree installation
In addition, the more advanced installation methods of overseas subsea trees mainly include: the Heave Compensated Landing System (HCLS) method invented by the Shell deepwater service technical team in the United States, and the HCLS (Heave Compensated Landing System) method designed and invented by the deepwater mooring experts of the InterMoor Company in the United States. CASIM (Compensated Anchor-handler Subsea Installation Method) method, both of these two methods have automatic heave compensation devices, and the installation and positioning accuracy is high. Working in shallow water

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  • Underwater Christmas tree installing method and system
  • Underwater Christmas tree installing method and system
  • Underwater Christmas tree installing method and system

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Embodiment Construction

[0082] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings, which cannot be used to limit the protection scope of the present invention.

[0083] Currently, semi-submersible drilling platforms are used to install underwater Christmas trees in offshore oilfield production. Semi-submersible drilling platforms do not have self-propelled capabilities and need towage. The mobilization and demobilization speed is slow, and the daily cost of semi-submersible drilling platforms is high. And resources are scarce. Semi-submersible drilling platforms use drill pipes to carry underwater Christmas trees to the wellhead. During the lowering process, it takes a lot of time to connect the drill pipes, and the installation efficiency is low; semi-submersible drilling platforms use drill pipes to carry underwater Christmas trees. , the outer diameter of the drill pipe is large, a...

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Abstract

The invention discloses an underwater Christmas tree installing method and system. The underwater Christmas tree installing method comprises the steps that marine arrangement is conducted on a single engineering ship loaded with an underwater Christmas tree, a main underwater robot ROV and an auxiliary ROV; then, a build-in crane of the single engineering ship is adopted and is aided by the main ROV to put the underwater Christmas tree at an underwater preset position, and the underwater Christmas tree is aided by the main ROV and the auxiliary ROV to be installed on a well mouth. By the adoption of the scheme, the single engineering ship having self-propulsion capability can be adopted to perform operation, daily payment is reduced, and ship resources are sufficient. In addition, the build-in crane of the single engineering ship carries the underwater Christmas tree to reach the well mouth and can be continuously and rapidly put down, the putdown efficiency is very high, and the diameter of a steel wire rope is small and facilitates reduction of the interference of environment load to the installing process.

Description

technical field [0001] The invention relates to the field of offshore oil exploration and development, in particular to an installation method and system for an underwater Christmas tree. Background technique [0002] There are usually two ways to exploit offshore oilfields, one is the combination of fixed or floating oil production platforms and water (dry) Christmas trees, and the other is the use of floating production storage and offloading devices (FPSO) Or a mining method that combines an external pipeline with an underwater (wet) Christmas tree. The subsea (wet) Christmas tree is an important part of the second production method. [0003] At present, for the second mining method, the mainstream practice in the world is to use drilling platforms for operations, but the daily rate of using drilling platforms is too high, and resources are scarce, so it is difficult to meet the growing demand for underwater Christmas tree installation. In addition, the more advanced in...

Claims

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Application Information

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IPC IPC(8): E21B43/013
CPCE21B43/013
Inventor 任翔汪雷沈星星逯晶晶李俊赵槊武林
Owner CHINA NAT OFFSHORE OIL CORP
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