CN214365979U - Wellhead protection device for underwater large-diameter steel cylinder open caisson - Google Patents

Abstract

The utility model discloses an underwater large-diameter steel cylinder open caisson wellhead protection device, which comprises a steel cylinder, wherein the steel cylinder is vibrated and sunk into a seabed mud layer, a cylinder top opening of the steel cylinder is positioned above the mud layer, a water-proof guide pipe penetrating into the mud layer is arranged at the cylinder bottom of the steel cylinder, and a concrete back cover is poured on the mud layer between the inner wall at the bottom of the steel cylinder and the water-proof guide pipe; the riser pipe comprises at least three sections of pipes which are connected with each other in a threaded manner or in a quick buckling manner. The utility model aims at providing a major diameter steel drum open caisson well head protector that is suitable for protection navigation area or sensitive area underwater production system production safety.

Description

Wellhead protection device for underwater large-diameter steel cylinder open caisson

Technical Field

The utility model relates to an ocean engineering technology field especially relates to an underwater major diameter steel drum open caisson well head protector.

Background

The development of the oil and gas resource sensitive area in the sea area can not be carried out above the water surface in principle, the navigation area is limited by the navigation limit of ships, the development is carried out through a fixed drilling platform, the navigation of the ships can be greatly influenced, meanwhile, the platform also faces a great ship collision risk, and in order to avoid or reduce the safety accidents between the navigation ships and the offshore platform, the offshore platform cannot be established in most sensitive areas.

The underwater production system is developed in a navigation area, the risk probability that the underwater production system with the protective cover is possibly damaged by activities such as anchor dropping and dragging of past ships is larger than that of a sensitive area, and meanwhile, seabed foundation treatment or foundation pit supporting and stability problems of structures and foundation pits, safety problems of drilling and underwater protection facilities and the like are difficult to evaluate. Therefore, a wellhead protection device of a large-diameter steel cylinder open caisson, which is suitable for protecting the production safety of underwater production systems in navigation areas or sensitive areas, is needed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome not enough among the above-mentioned prior art, aim at providing one kind and be suitable for the safe major diameter steel drum open caisson well head protector of protection navigation area or sensitive area underwater production system production.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a wellhead protection device for an underwater large-diameter steel cylinder open caisson comprises a steel cylinder, wherein the steel cylinder is vibrated and sunk into a seabed mud layer, a cylinder top opening of the steel cylinder is positioned above the mud layer, a waterproof guide pipe penetrating into the mud layer is arranged at the cylinder bottom of the steel cylinder, and a concrete back cover is poured on the mud layer between the inner wall of the bottom of the steel cylinder and the waterproof guide pipe; the riser pipe comprises at least three sections of pipes which are connected with each other in a threaded manner or in a quick buckling manner.

Further, the steel cylinder is composed of at least two sections of cylinders which are detachably connected.

Furthermore, the top of the steel cylinder is detachably provided with a cylinder top cover capable of passing through a pipeline.

Furthermore, a wellhead connector, a guiding base plate and an underwater Christmas tree production system are arranged at the position of the waterproof guide pipe of the concrete back cover.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model provides an underwater production system at the regional safety protection problem of restricted area, channel, the steel drum that constitutes is connected through multisection drum shakes in advance at the seabed mud layer in the oil field of waiting to develop and sinks, forms the steel drum that surrounds the oil field well drilling position and carry out the protection. And the cylinders above the water surface and between the water surface and the mud layer are reduced in a mode of only keeping the lowest end cylinder by removing the cylinders sinking into the mud layer cylinder at the lowest end in a vibrating mode, so that the channel is prevented from being blocked, convenience is provided for sailing of passing ships, and accidents are reduced. The utility model discloses arrangement ocean engineering and the well drilling process effective configuration of well steel drum, with the ocean engineering construction merge into the overall design of boring the well completion, reduce the construction degree of difficulty, reduce the expense.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of a steel casing hoisted by an ocean engineering ship;

FIG. 3 is a schematic view of a steel casing being vibrated down to a seabed mud layer;

fig. 4 is a schematic structural diagram of the installation of the present invention on the seabed mud layer.

Description of reference numerals:

1-ocean engineering ship, 2-sea level, 3-mud layer, 4-steel cylinder, 5-concrete back cover, 6-water-resisting guide pipe, 7-wellhead, 8-wellhead connector, 9-guiding base plate, 10-subsea production system and 11-cylinder top cover.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1, the underwater large-diameter steel cylinder open caisson wellhead protection device comprises a steel cylinder 4, wherein the steel cylinder 4 is vibrated and sunk into a seabed mud layer 3, a cylinder top opening of the steel cylinder 4 is positioned above the mud layer 3, a waterproof guide pipe 6 penetrating into the mud layer 3 is arranged in a cylinder of the steel cylinder 4, and a concrete back cover 5 is poured on the mud layer 3 between the inner wall of the bottom of the steel cylinder 4 and the waterproof guide pipe 6; the riser pipe 6 is composed of at least three sections of pipes which are connected with each other in a threaded manner or in a quick buckling manner; and the concrete back cover 5 is provided with a wellhead, a wellhead connector 8, a guide base plate 9 and an underwater Christmas tree production system 10 at the position of the riser pipe 6.

The steel cylinder 4 is composed of at least two sections of cylinders which are detachably connected, the steel cylinder 4 is detachably connected and assembled by utilizing a plurality of sections of cylinders, the processing difficulty of manufacturing the steel cylinder 4 can be reduced, and the steel cylinder 4 which can extend to the seabed mud layer 3 is formed by section connection.

The top of the steel cylinder 4 is fixedly provided with a cylinder top cover 11 capable of penetrating through a pipeline, the cylinder top cover 11 can protect an underwater production system in the cylinder, and a cylinder opening capable of penetrating through the pipeline is reserved for being connected with a drilling platform or other platforms when needed.

The implementation method of the utility model comprises the following steps:

(1) as shown in fig. 2, a steel cylinder 4 with at least two sections of cylinders is lifted up and lowered to a set position of a submarine well by a marine engineering vessel 1, and each section of the steel cylinder 4 is 9-13m in length and can be used for accommodating and installing a submarine production system;

(2) as shown in fig. 3, the steel cylinder 4 is vibrated and sunk into the seabed mud layer 3 through a multi-hammer linkage system, so that the top opening of the steel cylinder 4 at the lowest end is 0.5-1m higher than the seabed mud layer, submarine stones or mud are prevented from being flushed into the steel cylinder, and the multi-hammer linkage system can use a YCS series double-acting underwater full hydraulic hammer forged by a medium machine to vibrate and sink the steel cylinder 4;

(3) as shown in fig. 4, the seawater and sludge in the steel cylinder 4 are pumped out by using pumping equipment, the water-resisting conduit 6 is penetrated into the mud layer 3 in the steel cylinder 4 by using a multi-hammer linkage system, the conduit which is in threaded connection or quick buckling connection can be directly vibrated and sunk in the mud layer, each section of conduit is sequentially vibrated and sunk downwards, the water-resisting conduit 6 is penetrated into the seabed mud layer 3 more deeply, concrete is continuously poured to the bottom of the steel cylinder 4 by using a delivery pump, a concrete back cover 5 which surrounds the water-resisting conduit 6 and seals the water-resisting conduit 6 and the inner wall of the steel cylinder 4 is formed, and the height of the concrete back cover 5 is 2-3 m;

(4) dismantling the cylinders above the lowest end steel cylinder 4 and hoisting the cylinders by the ocean engineering ship 1, moving the ocean engineering ship 1 away, leaving the steel cylinders 4 hammered into the mud layer, and forming a drilling protection space below the mud layer 3 in the steel cylinders 4;

(5) dragging the drilling platform to the position of the steel cylinder 4, communicating the top of the riser 6 with a lifting riser of the drilling platform to complete the drilling and completion operation, and installing a wellhead 7, a wellhead connector 8, a guide base plate 9 and an underwater Christmas tree production system 10 at the position of the riser 6 through the drilling platform;

(6) the top of the steel cylinder 4 is provided with a cylinder top cover 11 which can penetrate through the lifting vertical pipe, the drilling protection space surrounded by the steel cylinder 4 is covered by the cylinder top cover 11, the collision of the past ships with the underwater production system caused by the actions of anchor dropping, anchor dragging and the like is avoided, the whole safety inside the steel cylinder 4 is protected, and the steel cylinder 4 and the underwater production system can be put into production after the whole installation.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (4)

1. The utility model provides an underwater major diameter steel drum open caisson well head protector, includes the steel drum, its characterized in that: the steel cylinder is vibrated and sunk into the seabed mud layer, the cylinder top opening of the steel cylinder is positioned above the mud layer, the cylinder bottom of the steel cylinder is provided with a water-resisting guide pipe penetrating into the mud layer, and a concrete back cover is poured on the mud layer between the inner wall of the bottom of the steel cylinder and the water-resisting guide pipe; the riser pipe comprises at least three sections of pipes which are connected with each other in a threaded manner or in a quick buckling manner.

2. The wellhead protection device for the underwater large-diameter steel cylinder open caisson according to claim 1, characterized in that: the steel cylinder is composed of at least two sections of cylinders which are detachably connected.

3. The wellhead protection device for the underwater large-diameter steel cylinder open caisson according to claim 2, characterized in that: the top of the steel cylinder is detachably provided with a cylinder top cover capable of penetrating through a pipeline.

4. The wellhead protection device for the underwater large-diameter steel cylinder open caisson according to claim 1, characterized in that: and the concrete back cover is provided with a wellhead, a wellhead connector, a guiding base plate and an underwater Christmas tree production system at the position of the riser.

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