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Installation process for back well drilling type platform sleeving-free wellhead

An installation process and drilling technology, which is applied in the field of offshore petroleum engineering to achieve the effect of saving workload

Inactive Publication Date: 2017-05-24
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there is no christmas tree on the top of the riser casing when this type of platform block is installed, the ultra-difficult hoisting of the riser casing through the horizontal slices of the two-layer block is still required when the block is installed

Method used

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  • Installation process for back well drilling type platform sleeving-free wellhead

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Embodiment Construction

[0020] Such as figure 1 As shown, the present invention adopts the following installation steps:

[0021] Step 1: Optimize the 2 sections of the riser sleeve, divide the riser 2 into three or four sections, and make the first two or three (depending on the specific design requirements) penetrate the seabed to reach the design entry Mud depth, and reserve the end section of the riser 2;

[0022] Step 2: Install jacket 1 at sea;

[0023] Step 3: Install the first two sections or the first three sections (depending on the specific design requirements) of the water riser 2 at sea to reach the design depth of mud penetration and meet the design standards after penetrating into the seabed;

[0024] The fourth step: construct the upper module 3 on land, and install and fix the last section of the riser 2 in the wellhead area of ​​the upper module 3;

[0025] The fifth step: marine transportation of the upper module 3 and the terminal water-proof casing 2 fixed on the upper module 3;

[0026] ...

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Abstract

The invention provides an installation process for a back well drilling type platform sleeving-free wellhead. The installation process comprises the following installation steps that 1, a water insulation casing pipe is divided into three or four sections of water insulation casing pipe bodies, the first two or three sections of water insulation casing pipe bodies are made to reach the designed driving depth after penetration into the seabed, and the tail section of water insulation casing pipe body is reserved; 2, a pipe guide frame is installed on the sea; 3, the first two or three sections of water insulation casing pipe bodies which reach the designed driving depth after penetration into the seabed are installed on the sea; 4, an upper assembling block is built on the land, and the tail section of water insulation casing pipe body is installed and fixed to a wellhead area of the upper assembling block; 5, the upper assembling block and the tail section of water insulation casing pipe body fixed to the upper assembling block are transported on the sea; and 6, after the upper assembling block is installed on the sea, fixing of the tail section of water insulation casing pipe body is removed, and the tail section of water insulation casing pipe body is connected back to the first two or three sections of water insulation casing pipe bodies. According to the installation process for the back well drilling type platform sleeving-free wellhead, the problems that the lifting difficulty of the upper assembling block on the sea is large, and the requirements for a weather window and the sea conditions are high are solved; and in addition, wellhead sleeving is avoided, so that the installation risk of the upper assembling block on the sea is reduced.

Description

Technical field [0001] The invention relates to offshore installation of a drilling platform, in particular to an installation process for a casing-free wellhead of a rear drilling platform, and belongs to the field of offshore oil engineering. Background technique [0002] At present, with the popularization and application of modular drilling rigs, the number of platforms for pre-drilling and completion of traditional drilling ships after the jacket installation is gradually reduced. Correspondingly, the design and installation technology of floating jack-driving riser casing is adopted. , Has always used the form that matches the pre-drilling of the drilling ship, that is, during the offshore installation of the jacket, the riser is penetrated to the designed depth of mud at one time (the top elevation is generally about 23 meters). Although there is no Christmas tree on the top of the riser during the installation of this type of platform module, the installation of the modul...

Claims

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Application Information

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IPC IPC(8): E02B17/00
CPCE02B17/00E02B2017/0039
Inventor 韩延波许南张秀林马德强王文龙李中华鞠文杰高飞于泽强梁光强曹一然李树升张大伟王长林
Owner CHINA NAT OFFSHORE OIL CORP
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