CN108166941B

CN108166941B - TLP double-layer vertical pipe drilling well completion construction operation method

Info

Publication number: CN108166941B
Application number: CN201711420323.6A
Authority: CN
Inventors: 畅元江; 李家仪; 张伟国; 陈斌; 陈国明
Original assignee: China University of Petroleum East China
Current assignee: China University of Petroleum East China
Priority date: 2017-12-25
Filing date: 2017-12-25
Publication date: 2020-11-24
Anticipated expiration: 2037-12-25
Also published as: CN108166941A

Abstract

The invention belongs to the technical field of ocean oil and gas development, and particularly relates to a TLP double-layer riser well drilling and completion construction operation method. According to the construction operation method, all drilling work is completed before temporary well abandoning, the drilling riser is not recovered after the temporary well abandoning, and the production riser is installed in the drilling riser before well completion operation, so that the TLP double-layer riser well drilling and completion construction operation method is formed, the problem that the TLP well drilling and completion operation process is fuzzy is solved, leakage in the production and well repair operation process is avoided, and TLP safety operation is guaranteed.

Description

TLP double-layer vertical pipe drilling well completion construction operation method

Technical Field

The invention belongs to the technical field of ocean oil and gas development, and particularly relates to a TLP double-layer riser well drilling and completion construction operation method.

Background

With the rapid development of deepwater marine oil and gas exploration and development, floating production and drilling equipment are widely applied, a tension leg platform (namely a TLP platform) is used as one of platforms selected for marine development and generally consists of four parts, namely a platform main body, a mooring system, an anchoring system and a drilling production system, wherein the platform main body provides the pre-tension of a stand pipe, supports loads of production, drilling equipment and the like; the mooring system is connected with the platform main body and the seabed anchoring system, so that the platform is ensured to have good motion performance, and the motion response of the platform is controlled; the anchoring system provides anti-pulling force, and ensures good stability and heave performance of the tension leg platform. In addition, the tension leg platform has cluster well development, greatly improves the operating efficiency, and the dry production tree and the blowout preventer are adopted, so that the well completion, well repair and well adjustment operations are greatly facilitated, and the platform has the characteristics of small drifting and heaving and the like.

The tension leg platform has good movement performance, high efficiency and economy, and becomes one of the main platform types selected for deep sea oil and gas exploitation at present. In the prior art, the double-layer riser drilling and completion operation by using the tension leg platform is a development trend of the industry, but in the prior art, the research on the TLP drilling and completion technology is still in an initial stage, and the problem that the drilling and completion operation process is unclear exists, particularly the operation using the double-layer riser is performed.

Disclosure of Invention

In view of the problems in the prior art, the invention provides a TLP double-layer vertical tubular drilling completion construction operation method, which provides technical support for TLP double-layer vertical tubular drilling completion operation.

The invention realizes the purpose through the following technical scheme:

a TLP double-deck riser drilling completion construction method, comprising:

lowering the guide pipe to a predetermined first depth below the mudline;

drilling a first wellbore within the conduit to a predetermined second depth, the second depth being below the first depth;

running a first casing in the first wellbore to a predetermined third depth;

installing an underwater wellhead at the top of the conduit;

pulling a TLP platform directly above the subsea wellhead and installing a drilling riser between the TLP platform and the subsea wellhead;

drilling a second wellbore within the first casing to a predetermined third depth, the third depth being below the second depth;

lowering a second layer of casing within the second wellbore to a third depth;

drilling a third wellbore within the second casing to a predetermined fourth depth, the fourth depth being below the third depth;

performing temporary well abandoning operation in the second layer of casing, and forming two cement plugs from top to bottom in the second layer of casing;

producing a riser within the drilling riser installation;

drilling through the cement plug in the second layer of casing pipe, and arranging corresponding well completion devices;

and installing the Christmas tree for production operation.

Further, the lowering the conduit to a predetermined first depth below the mudline comprises:

the guide pipe is lowered by means of jetting or drilling to a predetermined first depth below the mudline.

Further, said drilling the first wellbore within the conduit to a predetermined second depth comprises:

drilling the first wellbore into the conduit to a predetermined second depth using a method of riser-less drilling.

Further, the installing a drilling riser between the TLP platform and the subsea wellhead comprises:

installing a wellhead tieback connector on the underwater wellhead;

installing a stress nipple on the wellhead tieback connector;

installing a drilling riser on the stress nipple;

a tension ring is sleeved on the periphery of the drilling riser and connected to a tensioner deck of the TLP platform through tension ropes on two sides;

installing a blowout preventer between the drilling riser and a drilling deck of the TLP platform.

Preferably, the stress short section is a tapered stress short section or a trapezoidal stress short section.

The invention has the beneficial effects that:

the invention establishes a TLP double-layer riser well drilling and completion construction operation method, which completes all well drilling work before temporary well abandoning, does not recover the well drilling riser after temporary well abandoning, and installs a production riser in the well drilling riser before well completion operation to form a TLP double-layer riser well drilling and completion construction operation method, thereby solving the problem of fuzziness of the TLP well drilling and completion operation process, ensuring no leakage in the production and well repair operation processes and ensuring the safe operation of TLP.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic flow chart of a TLP double-riser drilling and completion operation method according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a TLP double-layer vertical tubular drilling completion operation process after temporary well abandoning;

FIG. 3 is a schematic structural diagram of a TLP double-riser completion construction operation according to an embodiment of the present invention;

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a schematic flow diagram of a TLP double-riser drilling and completion construction operation method according to an embodiment of the present invention, fig. 2 is a schematic structural diagram of a TLP double-riser drilling and completion construction operation process according to an embodiment of the present invention after a well is temporarily abandoned, fig. 3 is a schematic structural diagram of a TLP double-riser drilling and completion construction operation according to an embodiment of the present invention after completion, referring to fig. 1, fig. 2, and fig. 3, a construction operation method according to an embodiment of the present invention includes:

lowering the conductor 1 to a predetermined first depth below the mudline;

drilling the first borehole in the guide tube 1 to a predetermined second depth, the second depth being below the first depth;

lowering a first casing 2 in the first wellbore to a predetermined second depth;

an underwater wellhead 3 is arranged at the top of the guide pipe 1;

towing the TLP platform 4 directly above the subsea wellhead 3 and installing a drilling riser 5 between the TLP platform 4 and the subsea wellhead 3;

drilling a second borehole into the first casing 2 to a predetermined third depth, the third depth being below the second depth;

lowering a second layer of casing 6 in the second wellbore to a third depth;

drilling a third wellbore into the second casing 6 to a predetermined fourth depth, the fourth depth being below the third depth;

performing temporary well abandoning operation in the second layer of casing 6, and forming two cement plugs 7 (shown in figure 2) from top to bottom in the second layer of casing 6;

installing an inner production riser 13 within the drilling riser 5;

the cement plug 7 in the second layer of casing is opened, and corresponding well completion devices are arranged;

the tree 14 is installed for production operations (as shown in fig. 3).

In an embodiment of the invention, the guide pipe 1 may be lowered by means of jetting or drilling to a predetermined first depth below the mudline.

In embodiments of the invention, the method of riser-less drilling may be used to drill a first wellbore into the conductor 1 to a predetermined second depth.

In an embodiment of the invention, installing a drilling riser between a TLP platform and a subsea wellhead comprises:

installing a wellhead tieback connector 8 on the underwater wellhead 3;

a stress nipple 9 is arranged on the wellhead tieback connector 8;

installing a drilling riser 5 on the stress nipple 9;

a tension ring 10 is sleeved on the periphery of the drilling riser 5, and the tension ring 10 is connected to a tensioner deck of the TLP platform 4 through tension ropes 11 positioned on two sides;

a blowout preventer 12 is installed between the drilling riser 5 and the drilling deck of the TLP platform 4 to prevent a blowout accident of oil during the drilling and completion operation.

In the embodiment of the invention, the stress short section 9 is a tapered stress short section or a trapezoidal stress short section.

In the embodiment of the invention, all drilling work is completed before temporary abandoning the well, the drilling riser is not recovered after temporary abandoning the well, and the production riser is installed in the drilling riser before completion operation, so the design has the advantages that: the temporary well abandoning operation is simple, potential danger of pollution to an oil reservoir or an open hole screen pipe does not exist, the production vertical pipe can only be used for well completion and is not subjected to load and abrasion related to well drilling, the installation quality of the production vertical pipe is improved, the drilling vertical pipe is not disassembled, the pipeline recovery and installation time is saved, and the operation cost is saved.

In summary, the embodiment of the invention establishes a TLP double-layer riser drilling and completion construction operation method, which can solve the problem that the TLP drilling and completion operation process is unclear, ensure that no leakage occurs in the production and workover operation processes, and ensure the safe operation of TLP. The above-mentioned embodiments are only for convenience of description, and are not intended to limit the present invention in any way, and those skilled in the art will understand that the technical features of the present invention can be modified or changed by other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A TLP double-layer vertical pipe drilling completion construction operation method is characterized by comprising the following steps:

lowering the guide pipe to a predetermined first depth below the mudline;

running a first casing in the first wellbore to a predetermined second depth;

installing an underwater wellhead at the top of the conduit;

lowering a second layer of casing within the second wellbore to a third depth;

producing a riser within the drilling riser installation;

and installing the Christmas tree for production operation.

2. The TLP dual riser completion construction operation method of claim 1, wherein the lowering the conduit to the predetermined first depth below the mudline comprises:

3. The TLP dual-riser drilling completion construction operation method of claim 1, wherein the drilling a first wellbore to a predetermined second depth within the conduit comprises:

4. The TLP dual riser drilling completion operation method of claim 1, wherein installing a drilling riser between the TLP platform and the subsea wellhead comprises:

installing a wellhead tieback connector on the underwater wellhead;

installing a stress nipple on the wellhead tieback connector;

installing a drilling riser on the stress nipple;

installing tension rings on the periphery of the drilling riser, wherein the tension rings are connected to a tensioner deck of the TLP platform through tension ropes on two sides;

a blowout preventer is installed between the upper end of the drilling riser and the drilling deck of the TLP platform.

5. The TLP double-deck riser drilling completion construction operation method as recited in claim 4, wherein the stress sub is a tapered stress sub or a trapezoidal stress sub.