CN108895237A - A kind of electric-heating belt is placed in the combustible ice Primordial Qi standpipe device in standpipe - Google Patents

Abstract

The invention provides a combustible ice raw gas standpipe device in which the electric heating cable is placed in the standpipe. The device integrates a layer of electric heating cable wound in the standpipe, a thermal insulation layer and a set of power supply communication system between the standpipes , the system ensures that the riser joint and the heating cable joint are connected at one time; the heating heating contact is set outside the thread sealing surface, and does not contact the flammable fluid in the riser, so that the flammable ice riser has a safe electric heating function ; and the electric heating cable is located inside the production casing, which greatly improves the thermal efficiency and reduces the power load required for the heat tracing of the standpipe, thus solving the technical problem that the pipeline is easy to be blocked during the mining of combustible ice.

Description

A combustible ice raw gas standpipe device with electric heating cable placed in the standpipe

technical field

The invention belongs to the marine energy mining manufacturing industry, and relates to a combustible ice-formed gas transmission standpipe device in which an electric heating cable is placed in the standpipe.

Background technique

With the exploration of marine energy, the equipment used to exploit marine combustible ice energy is also more and more favored by major marine equipment manufacturers in the world. Among them, the riser device used for the transmission of combustible ice raw gas is one of the key components for combustible ice mining. 1. Four basic methods of mining combustible ice: decompression mining method, heat shock mining method, chemical agent injection mining method, carbon dioxide replacement method, or a combination of these four methods, all of which make combustible ice decompose to generate methane and Water, and then the mixture of methane and water is transported to the sea surface through the riser, and the following risks exist in the process of transporting the combustible ice fluid to the sea surface in the riser: 1. When the combustible ice is mined, most of the fluid in the oil reservoir riser is methane and The mixture of water, when the fluid is transported to the sea surface through the riser, the temperature will gradually decrease due to heat exchange with the outside world, and natural gas hydrate (combustible ice) may be formed again to block the pipeline; 2. In the plan or plan During the outage period, because the temperature of the fluid in the vertical pipeline of the oil layer will gradually drop to the ambient temperature (water temperature), the risk of natural gas hydrate blocking the pipeline will be formed; 3. Due to the deep water depth of deep sea development, it is necessary to use The submersible pump pressurizes the downhole fluid to overcome hydrostatic pressure and pipeline resistance. The increased pressure and the gradual drop in fluid temperature may also lead to the re-formation of gas hydrates and block the standpipe.

The above risks are one of the bottleneck problems in the mining process of combustible ice. It is necessary to find an economical solution to reduce the risk of standpipe blockage in the mining process of combustible ice and pave the way for the commercial exploitation of combustible ice resources. Petroleum The most commonly used heat tracing method in the industry is to use high voltage to heat the pipe itself or to use externally wound heating tape. The former needs to establish effective insulation between multi-layer casings, which is technically difficult. Although the latter is technically feasible, it is often due to corrosion , anti-erosion, etc. to set a thicker lining layer, this method will lead to slow heat transfer and low heat tracing efficiency, such as placing the electric heating cable inside the standpipe, only by isolating the anti-corrosion and anti-wear layer from the medium, it can improve Heat tracing efficiency, to solve the problem of heat tracing efficiency reduction caused by winding the heating tape outside the pipe.

Contents of the invention

The present invention proposes a combustible ice raw gas transmission riser device with an electric heating cable placed in the riser, with the purpose of reducing the risk of riser blockage during the mining of combustible ice and paving the way for the commercial exploitation of combustible ice resources.

The technical solution adopted in the present invention is: a combustible ice-formed gas standpipe device with an electric heating cable placed in the standpipe, the device includes the following content: a riser connecting the subsea wellhead to the production tree on the water, one end of the standpipe is an external thread Joint, the other end is an internal threaded joint; an anti-corrosion and wear-resistant lining pipe placed in the standpipe, the anti-corrosion and wear-resistant lining pipe is made of polymer material; a layer of electric heating cable wound outside the anti-corrosion and wear-resistant lining pipe; In the gap between the inner liner pipe and the standpipe that has been wound with the electric heating cable, pour the inner lining bottom material; a thermal insulation layer, placed outside the standpipe; a set of power connection system between the riser pipe sections, in the external threaded joint A groove is processed on the outer surface, and insulating material is filled in the groove, and a conductor is embedded in the center of the insulating material. The conductor extends to the end of the standpipe and is connected with a power contact; The head finally stops at the same position, touches each other, and the power supply is connected; the bottom lining is located between the lining pipe and the standpipe, and is molded by polymer material, which is used for bonding the lining pipe and the standpipe. Insulation, strong bonding ability, no chemical reaction with the covering layer of the electric heating cable.

Preferably, the thermal insulation layer is polyethylene or polypropylene material.

As a preference, the riser device includes an oil layer riser 108, a bottom lining 106, an electric heating cable 107, a surface layer lining pipe 105, an external threaded joint 101A, and a plurality of heating cable wire contacts; according to the requirements of the thermal insulation layer, it can also be Add a set of outer protection pipe 110 and the outer thermal insulation layer 109 of the standpipe. The thermal insulation layer can be a thermal insulation material or a vacuum layer. One end of the standpipe is an external threaded joint 101A, and the other end of the pipe section One end is an internally threaded joint 101B, and the surface lining pipe 105 is made of polymer material through extrusion molding, and its outer diameter is smaller than the inner diameter of the oil layer riser 108; the electric heating cable 107 is wound on the outer surface of the lining pipe 105, and then wound The lining pipe 105 of the electric heating cable 107 is installed in the oil layer riser 108; the bottom lining material 106 is poured in the gap between the surface layer lining pipe 105 and the oil layer riser 108, so as to realize the reliable production of the casing pipe 108 and the inner liner pipe 105. Connect and protect the electric heating cable 107; the surface lining material 105 should not only have good wear resistance, but also have good thermal conductivity, so as to ensure that most of the heat generated by the electric heating cable 107 is absorbed by the combustible ice Absorption, if the bottom liner 106 has the function of heat preservation, the heat insulation layer 109 and the outer sleeve 110 are not needed.

As a preference, at the externally threaded joint 101A, a plurality of holes are drilled laterally, and the polymer insulating material 104 is filled in the holes first, and then a hole is drilled inside the polymer insulating material 104, and the conductor 103 is filled inside, and each heating cable The root wire is connected to the filled conductor 103 at the joint to form electrical conduction with the contact.

As a preference, process a groove on the outer surface of the externally threaded joint, fill the polymer insulating material 104 into it, and make it connect with the insulating material in the side hole; process a groove on the insulating material 104, and embed the conductor 103, extending to the contact 102, and then covering the conductor 103 with polymer insulating material.

As a preference, corresponding to the externally threaded joint 101A, a corresponding contact is made on the internally threaded joint 101B. When the externally threaded joint and the internally threaded joint are coupled, the connection of the thread sealing surface can be ensured, and the electrical connection between the riser pipe sections can be ensured. The heating cable is turned on.

As a preference, the joints between the oil layer risers can be in the form of flanges. At the flange joint 101C, a plurality of holes are drilled laterally. First, the polymer insulating material 104 is filled in the holes, and then a hole is drilled inside 104. The interior is filled with a conductor 103, and all wires of the heating cable are connected to the conductor 103 at the joint to achieve conduction with the contact. In addition to good wear resistance, the surface lining should also have good thermal conductivity to ensure that the electric heating cable 107 All the heat generated is absorbed by the fluid.

As preferably, slots are made on the outer surface of the flange joint, and the polymer insulating material 104 is filled therein so that it is connected with the insulating material in the side hole, so as to ensure the insulation of the conductor 103 and the production bushing, and then the insulating material 104 Slots are made on the top, the conductor 103 is embedded, and extends to the contact 102C, and then the insulating material is used to cover the conductor 103 .

The beneficial effects of the invention are: the design can complete the riser connection at one time, improve the construction efficiency on site, and have high reliability. The device can ensure the current conduction of the heating cable and reduce the risk of standpipe blockage during the mining of combustible ice.

Description of drawings

Figure 1 is a schematic diagram of a combustible ice raw gas standpipe device with an electric heating cable placed in the standpipe and the external threaded joint end of the standpipe;

Fig. 2 is the A direction view of Fig. 1;

Fig. 3 is a schematic diagram of the structure of the internally threaded joint end of the riser;

Fig. 4 is a B-direction view of the internally threaded joint of the riser in Fig. 3;

Fig. 5 is a schematic diagram of a combustible ice raw gas standpipe device and a standpipe flange sealing joint in which the electric heating cable is placed in the standpipe;

Fig. 6 is a C-direction view of the riser flange joint in Fig. 5 .

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be mechanical connection or electrical connection, or two The internal communication of a component can be directly connected or indirectly connected through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations.

The present invention describes a combustible ice raw gas standpipe device in which the electric heating cable is placed in the standpipe. The device includes the following contents: a riser connecting the subsea wellhead to the production tree on the water. One end of the standpipe is an external threaded joint, and the other end It is an internal threaded joint; an anti-corrosion and wear-resistant lining pipe placed in the standpipe, the anti-corrosion and wear-resistant lining pipe is made of polymer material; a layer of electric heating cable wound outside the anti-corrosion and wear-resistant lining pipe; In the gap between the inner liner pipe and the standpipe of the heating cable, pour the inner lining bottom material; a thermal insulation layer, placed outside the standpipe; a set of power connection system between the riser pipe sections, processed on the outer surface of the external threaded joint The groove is filled with insulating material, and the conductor is embedded in the center of the insulating material. The conductor is extended to the end of the riser and connected with a power contact; after two adjacent riser pipe sections are connected by threads, the two power contacts finally stop at At the same position, they are in contact with each other, and the power supply is connected; the bottom lining is located between the lining pipe and the standpipe, and is cast and formed with polymer materials, which is used to bond the lining pipe and the standpipe. It has good thermal insulation performance, electrical insulation, and relatively Strong adhesive ability, no chemical reaction with the covering layer of the electric heating cable.

Preferably, the thermal insulation layer is polyethylene or polypropylene material.

Fig. 1 is a schematic diagram of an external thread joint of an oil layer riser, which includes an oil layer riser 108, a bottom lining 106, an electric heating cable 107, a surface layer inner liner 105, an external thread joint 101A, and a plurality of heating cable wire contacts in this embodiment point; according to the requirements of the heat insulation layer, a set of outer protection pipe 110 and the outer heat insulation layer 109 of the standpipe can also be added, and the heat insulation layer can be a heat insulation material or a vacuum layer; One end is an externally threaded joint 101A, and the other end of the pipe section is an internally threaded joint 101B (Fig. 3). The surface lining pipe 105 is made of polymer material through extrusion molding, and its outer diameter is smaller than the inner diameter of the oil reservoir riser 108; Wrap the heating cable 107 on the outer surface of the liner pipe 105, then install the liner pipe 105 wrapped with the electric heating cable 107 in the oil layer riser 108, and pour the bottom liner in the gap between the surface layer liner pipe 105 and the oil layer riser 108 material 106, to realize the reliable connection between the production sleeve 108 and the inner liner 105, and to protect the electric heating cable 107. The surface lining material 105 should not only have good wear resistance, but also have good thermal conductivity, to It is ensured that most of the heat generated by the electric heating cable 107 is absorbed by the combustible ice raw gas. In this embodiment, if the bottom lining 106 also has the function of heat preservation, the heat insulation layer 109 and the outer casing 110 are not required.

At the externally threaded joint 101A, there are multiple holes drilled laterally (determined according to the number of heating wires, in this embodiment, there are 2 holes). First, fill the holes with polymer insulating material 104, and then drill a The hole is filled with a conductor 103 inside, and each wire of the heating cable is connected with the filled conductor 103 at the joint to form electrical conduction with the contacts 102A1 and 102A2.

Fig. 2 is an A-direction view of the externally threaded joint 101A, a groove is processed on the outer surface of the externally threaded joint, a polymer insulating material 104 is filled therein, and it is connected with the insulating material in the side hole; A groove is processed on the top, the conductor 103 is embedded, and extends to the contact 102, and then the polymer insulating material is used to cover the conductor 103.

Fig. 3 is a schematic diagram of an internally threaded joint 101B of a threaded internal electric heating riser structure, corresponding to the externally threaded joint 101A, and corresponding contacts are made on the internally threaded joint 101B, when the externally threaded joint and the internally threaded joint are coupled, both can To ensure the connection of the thread sealing surface, and to make the electric heating cables conduction between the riser pipe sections.

In another embodiment (see Figure 5), the joints between the risers in the oil layer adopt flange type, and at the flange joint 101C, there are multiple holes drilled laterally (determined according to the number of heating wires, in this embodiment, there are 2 holes) ), first fill the hole with polymer insulating material 104, then drill a hole inside 104, fill the inside with conductor 103, and all the wires of the heating cable are connected to the conductor 103 at the joint to achieve conduction with the contacts 102C1 and 102C2 . In addition to good wear resistance, the surface lining should also have good thermal conductivity to ensure that all the heat generated by the electric heating cable 107 is absorbed by the fluid.

Figure 6 is a C-direction view of the flange joint of the flanged internal electric heat tracing riser. Grooves are made on the outer surface of the flange joint, and polymer insulating material 104 is filled into it to connect it with the insulating material in the side hole , so as to ensure the insulation between the conductor 103 and the production sleeve, and then slot the insulating material 104, insert the conductor 103, extend to the contact 102C, and then cover the conductor 103 with the insulating material.

In the description of this specification, descriptions referring to terms such as "one embodiment", "example", or "some examples" mean that specific features, structures, materials or characteristics described in connection with the embodiment or examples are included in the scope of the present invention. In at least one embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the invention is defined by the claims and their equivalents.

Claims (8)

1. A combustible ice raw gas standpipe device with an electric heating cable placed in the standpipe, characterized in that the device includes the following content: a riser connecting the subsea wellhead to the production tree on the water, one end of the standpipe is an external threaded joint, The other end is an internal thread joint; an anti-corrosion and wear-resistant lining pipe placed in the standpipe, the anti-corrosion and wear-resistant lining pipe is made of polymer materials; a layer of electric heating cable wound outside the anti-corrosion and wear-resistant lining pipe; In the gap between the inner liner pipe and the standpipe of the winding electric heating cable, pour the inner lining bottom material; a thermal insulation layer, placed outside the standpipe; a set of power connection system between the riser pipe sections, on the outer surface of the external thread joint A groove is processed, and insulating material is filled in the groove, and a conductor is embedded in the center of the insulating material. The conductor extends to the end of the standpipe and is connected with a power contact; Stop at the same position, contact each other, and connect the power supply; the bottom lining is located between the lining pipe and the standpipe, and is cast and formed with polymer materials, which is used to bond the lining pipe and the standpipe. It has good thermal insulation performance, electrical insulation, It has strong bonding ability and does not chemically react with the covering layer of the electric heating cable. 2. The combustible ice raw gas standpipe device according to claim 1, characterized in that the thermal insulation layer is made of polyethylene or polypropylene. 3. The combustible ice raw gas riser device according to claim 1, characterized in that the riser device includes an oil layer riser, a bottom lining, an electric heating cable, a surface layer lining pipe, an external threaded joint, and a plurality of heating cable wires Contact; according to the requirements of the thermal insulation layer, a set of outer protective tube and the outer thermal insulation layer of the standpipe can be added. The thermal insulation layer can be thermal insulation material or a vacuum layer, at one end of the standpipe It is an external threaded joint, and the other end of the pipe section is an internal threaded joint. The surface lining pipe is made of polymer material through extrusion molding, and its outer diameter is smaller than the inner diameter of the oil layer riser; the electric heating cable is wound on the outer surface of the lining pipe, Then install the inner liner pipe wound with the electric heating cable in the oil layer riser; pour the bottom liner material in the gap between the surface layer liner pipe and the oil layer riser to realize the reliable connection between the production casing and the inner liner pipe, and ensure the electric The heating cable forms a protection; the surface lining material should not only have good wear resistance, but also have good thermal conductivity to ensure that most of the heat generated by the electric heating cable is absorbed by the combustible ice. Thermal insulation function, then do not need thermal insulation layer and outer casing. 4. The combustible ice raw gas standpipe device according to claim 3, characterized in that, at the externally threaded joint, a plurality of holes are drilled laterally, first filling the holes with polymer insulating material, and then filling the polymer insulating material A hole is drilled inside, and the conductor is filled inside, and each wire of the heating cable is connected to the filled conductor at the joint to form electrical conduction with the contact. 5. The combustible ice raw gas standpipe device according to claim 4, characterized in that, a groove is processed on the outer surface of the external thread joint, and a polymer insulating material is filled therein, and made to be in contact with the insulating material in the side hole Connected; then process a groove on the insulating material, embed the conductor, extend to the contact, and then cover the conductor with a polymer insulating material. 6. The combustible ice raw gas standpipe device according to claim 5, characterized in that, corresponding to the external threaded joint, a corresponding contact is made on the internal threaded joint, and when the external threaded joint and the internal threaded joint are coupled, both can ensure The connection of the threaded sealing surface can also make the electric heating cables conduction between the riser pipe sections. 7. The combustible ice raw gas standpipe device according to claim 1, characterized in that the joints between the oil layer risers can adopt the flange type, and at the flange joints, a plurality of holes are drilled laterally, first in the holes Fill the polymer insulation material, drill a hole inside, and fill the conductor inside. All the wires of the heating cable are connected to the conductor at the joints to achieve conduction with the contacts. In addition to good wear resistance, the surface lining should also It has good thermal conductivity to ensure that all the heat generated by the electric heating cable is absorbed by the fluid. 8. The combustible ice raw gas standpipe device according to claim 7, characterized in that grooves are made on the outer surface of the flange joint, and polymer insulating material is filled therein so that it is connected with the insulating material in the side hole, In order to ensure the insulation between the conductor and the production sleeve, slots are then made on the insulating material, the conductor is embedded, and extended to the contact, and then the insulating material is used to cover the conductor.