CN111827916A - A large-scale deep-water suction anchor for group piles and multiple wellheads - Google Patents

Abstract

The invention relates to the technical field of deepwater drilling, in particular to a large deepwater suction anchor with a group of piles and multiple well mouths, which can effectively reduce the requirement on hoisting equipment, ensure that personnel can command and operate more conveniently, avoid accident risks and reduce use limitations; including central pile body and the supplementary spud leg of multiunit, the fixed mounting all around of central pile body has the supplementary spud leg of multiunit, and supplementary spud leg does not have the quantity restriction, the top of central pile body is provided with breather valve and central well head, the top of the supplementary spud leg of multiunit all is provided with supplementary well head, the top of the supplementary spud leg of multiunit all communicates and is provided with the mouth that absorbs water, the inside intercommunication of central pile body is provided with central inner tube, the inside of the supplementary spud leg of multiunit all is provided with supplementary inner tube, and central inner tube and central well head intercommunication, the supplementary inner tube of multiunit communicates with the.

Description

A large-scale deep-water suction anchor for group piles and multiple wellheads

technical field

The invention relates to the technical field of deep-water drilling, in particular to a large-scale deep-water suction anchor with group piles and multiple wellheads.

Background technique

In deepwater drilling engineering, the stability of the wellhead is the basic condition to ensure successful well construction. At present, the most commonly used techniques to improve the stability of the wellhead include the catheter injection technology and the deepwater suction anchor wellhead technology. The limitation of the catheter injection is the depth of the catheter into the mud. The requirements are high, and it is not suitable for shallow buried deposits, while the deep water suction anchor wellhead technology solves the limitation of conduit jetting and is very suitable for deep water shallow drilling engineering.

The current deepwater suction anchor wellhead technology, in order to increase the number of drilling, mainly uses single pile multiple suction anchors for drilling operations, to achieve the purpose of drilling multiple wells at one time, replacing the well construction work of a single deepwater wellhead suction anchor, but this This kind of single-pile multi-port suction anchor, due to the large internal space of the wellhead and the relatively large overall weight, found in the use process that the requirements for lifting equipment are high, the command and operation of personnel is inconvenient, and it is easy to cause accident risks, resulting in high use limitations. .

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides a large-scale deep-water suction anchor with multiple wellheads for group piles, which can effectively reduce the requirements for lifting equipment, make the command and operation of personnel more convenient, avoid accident risks, and reduce use limitations.

A large-scale deep-water suction anchor with group piles and multiple wellheads of the present invention includes a central pile body and multiple sets of auxiliary pile legs, and multiple sets of auxiliary pile legs are fixedly installed around the central pile body, and the number of auxiliary pile legs is unlimited. The top is provided with a central wellhead, the tops of multiple sets of auxiliary legs are provided with auxiliary wells, the tops of multiple sets of auxiliary legs are connected with a water suction port, the interior of the central pile body is communicated with a central inner cylinder, and the multiple sets of auxiliary legs are provided with a central inner cylinder. Auxiliary inner cylinders are arranged in the interior of each of them, and the central inner cylinder is communicated with the central wellhead, and multiple sets of auxiliary inner cylinders are respectively communicated with multiple sets of auxiliary wellheads.

A large-scale deep-water suction anchor with multiple wellheads in a group pile of the present invention further comprises a ventilation valve, which is fixedly installed on the top of the central pile body.

In the large-scale deep-water suction anchor with multiple wellheads in a group pile of the present invention, upper centralizers and lower centralizers are arranged on the inner walls of the central inner cylinder and the multiple sets of auxiliary inner cylinders, which can be set or canceled according to practical application needs.

In a large-scale deep-water suction anchor with multiple wellheads in a group pile of the present invention, both the central inner cylinder and the auxiliary inner cylinder can have two structures of a vertical inner cylinder and a pre-curved inner cylinder.

In the large-scale deep-water suction anchor with multiple wellheads in a group pile of the present invention, the central pile body and the auxiliary pile legs are made of hard alloy steel, and the surface is treated with anti-corrosion and anti-rust.

Compared with the prior art, the beneficial effects of the present invention are: when the device is lowered under negative pressure, the deep-water suction pump is connected to the suction port provided at the top of the auxiliary leg, and the central inner cylinder and the interior of the auxiliary leg are provided inside the central pile. The auxiliary inner cylinders set are all channels for drilling and lowering the pipe string. By setting the auxiliary inner cylinder on the auxiliary pile legs, the function of drilling multiple wells can be completed by the suction anchor next time. It is necessary to adjust the number of auxiliary pile legs and the setting of the central wellhead to realize the structural design most suitable for practical applications. There are obvious advantages in the overall diameter, which can reduce the requirements for lifting equipment, make the command and operation of personnel more convenient, avoid the risk of accidents, and reduce the limitations of use.

Description of drawings

Fig. 1 is the axonometric schematic diagram of three piles of the present invention;

Fig. 2 is the upper side schematic diagram of three piles of the present invention;

Fig. 3 is the A-A sectional structure schematic diagram of three piles of the present invention;

Fig. 4 is the B-B sectional structure schematic diagram of three piles of the present invention;

Fig. 5 is the A-A sectional schematic diagram of the three-pile pre-bent inner cylinder of the present invention;

Fig. 6 is the B-B sectional schematic diagram of the three-pile pre-bent inner cylinder of the present invention;

7 is a three-pile axonometric schematic diagram of the present invention without a center wellhead;

Fig. 8 is the axonometric schematic diagram of the multi-pile of the present invention;

Symbols in the drawings: 1. central pile body; 2. auxiliary pile legs; 3. central wellhead; 4. auxiliary wellhead; 5. water suction port; 6. central inner cylinder; 7. auxiliary inner cylinder; 8. ventilation valve; 9 , upper centralizer; 10, lower centralizer.

Detailed ways

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are intended to illustrate the present invention, but not to limit the scope of the present invention.

As shown in FIGS. 1 to 8 , a large-scale deep-water suction anchor with multiple wellheads in a group pile of the present invention includes a central pile body 1 and multiple sets of auxiliary pile legs 2, and a plurality of sets of auxiliary pile legs 2 are fixedly installed around the central pile body 1. , and there is no limit to the number of auxiliary legs 2, the top of the central pile body 1 is provided with a central wellhead 3, the tops of multiple sets of auxiliary legs 2 are provided with auxiliary wells 4, and the tops of multiple sets of auxiliary legs 2 are connected with a water absorbing Orifice 5, the interior of the central pile body 1 is communicated with a central inner cylinder 6, the interior of multiple groups of auxiliary legs 2 are provided with auxiliary inner cylinders 7, and the central inner cylinder 6 is communicated with the central wellhead 3, and multiple groups of auxiliary inner cylinders 7 Connect with multiple sets of auxiliary wellheads 4 respectively; when the device is under negative pressure, the deep water suction pump is connected to the suction port 5 provided at the top of the auxiliary pile leg 2, and the central inner cylinder 6 and the auxiliary pile leg 2 set inside the central pile body 1 are connected. The auxiliary inner cylinder 7 provided inside is the channel for drilling and lowering the pipe string. By setting the auxiliary inner cylinder 7 on the auxiliary pile leg 2, the function of drilling multiple wells can be completed by the suction anchor next time. , The number of auxiliary pile legs 2 and the setting of the central wellhead 3 can be adjusted according to actual needs to achieve the most practical structural design. The present invention has obvious advantages in weight and overall diameter of the structure, thereby reducing the requirements for hoisting equipment, making it more convenient for personnel to command and operate, avoiding accident risks and reducing usage limitations.

A large-scale deep-water suction anchor with multiple wellheads in a group pile of the present invention further includes a ventilation valve 8, which is fixedly installed on the top of the central pile body 1; by setting the ventilation valve 8, during seabed installation, the closed space and seawater can be separated. Connected to reduce the resistance of running, it is convenient for the suction anchor to be quickly installed in place, and it can also be set or canceled according to the actual situation to reduce the limitations of use.

In a large-scale deep-water suction anchor with multiple wellheads in a group pile of the present invention, an upper centralizer 9 and a lower centralizer 10 are arranged on the inner walls of the central inner cylinder 6 and the multiple sets of auxiliary inner cylinders 7; The centralizer 10 can effectively center the inner pipe string, reduce stress concentration points, avoid collapse of the inner pipe string, and reduce usage limitations, and can be set or canceled according to actual application needs.

In a large-scale deep-water suction anchor with multiple wellheads in a group pile of the present invention, both the central inner tube 6 and the auxiliary inner tube 7 can have two structures of a vertical inner tube and a pre-bent inner tube; by using the pre-bent wellbore, the deflection can be effectively reduced It is beneficial to the implementation of deep-water and shallow horizontal wells, and can be selected according to actual conditions to reduce the limitations of use.

In a large-scale deep-water suction anchor with multiple wellheads in a group pile of the present invention, the central pile body 1 and the auxiliary pile legs 2 are made of hard alloy steel, and the surface is treated with anti-corrosion and anti-rust; The hardness and strength of the central pile body 1 and the auxiliary pile legs 2 are enhanced, rust and corrosion are prevented, the service life is prolonged, and the use reliability is improved.

A large-scale deep-water suction anchor with multiple wellheads in a group pile of the present invention, when working, firstly when the device is lowered under negative pressure, the deep-water suction pump is connected to the water suction port 5 provided at the top of the auxiliary pile leg 2, and the central pile body 1 is arranged inside. The central inner cylinder 6 and the auxiliary inner cylinder 7 provided inside the auxiliary leg 2 are both channels for drilling and lowering the pipe string, and the upper centralizer 9 and the lower centralizer 10 are used to centralize the pipe string to realize the next suction anchor. It can complete the function of drilling multiple wells, and can adjust the number of auxiliary legs 2 and the setting of the central wellhead 3 according to actual needs, so as to realize the structural design most suitable for practical applications.

A large-scale deep-water suction anchor with group piles and multiple wellheads of the present invention is installed, connected or set up by common mechanical methods, and can be implemented as long as its beneficial effects can be achieved; The ventilation valve of the suction anchor is purchased on the market, and the technicians in the industry only need to install and operate it according to the accompanying instruction manual.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present invention, several improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (5)

1. a large-scale deep-water suction anchor with multiple wellheads in group piles, is characterized in that, comprises center pile body (1) and multiple groups of auxiliary pile legs (2), and the periphery of center pile body (1) is fixedly installed with multiple groups of auxiliary pile legs ( 2), and there is no limit on the number of auxiliary legs (2), the top of the central pile body (1) is provided with a central wellhead (3), and the tops of multiple sets of auxiliary legs (2) are provided with auxiliary wells (4), and many The tops of the sets of auxiliary legs (2) are all communicated with water suction ports (5), the interior of the central body (1) is communicated with a central inner cylinder (6), and the interiors of the plurality of sets of auxiliary legs (2) are provided with An auxiliary inner cylinder (7), and the central inner cylinder (6) is communicated with the central wellhead (3), and multiple sets of auxiliary inner cylinders (7) are respectively communicated with multiple sets of auxiliary wellheads (4). 2 . The large-scale deep-water suction anchor with multiple wellheads in a group pile according to claim 1 , further comprising a vent valve ( 8 ), which is fixedly installed on the top of the central pile body ( 1 ). 3 . 3. a kind of pile group multi-wellhead large-scale deep-water suction anchor as claimed in claim 2, is characterized in that, the inner wall of described central inner cylinder (6) and multiple groups of auxiliary inner cylinders (7) are all provided with upper centralizer ( 9) and the lower centralizer (10), which can be set or canceled according to actual application needs. 4. A large-scale deep-water suction anchor with multiple wellheads in a group pile as claimed in claim 3, characterized in that both the central inner cylinder (6) and the auxiliary inner cylinder (7) can have both a vertical inner cylinder and a pre-bent inner cylinder. kind of structure. 5. A kind of large-scale deep-water suction anchor with multiple wellheads in group piles as claimed in claim 4, is characterized in that, described central pile body (1) and auxiliary pile legs (2) are all made of hard alloy steel, and the surface is made of hard alloy steel. Anti-corrosion and anti-rust treatment.

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