RU2544688C2 - Fitting assembly for multichannel pipelines - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: fitting assembly of multichannel pipelines comprises a pair of couplings connected on the one side to internal and external pipes forming central and intertube channels. Each of the couplings is provided with an axial and peripheral longitudinal channels communicating with the central and intertube channels of the internal and external pipes being connected pairwise. An inner branch pipe is fixed on the other side of one of the couplings in the axial channel, and an outer branch pipe is fixed outside. An inner smooth union nipple is fixed in the axial channel of the other coupling and an outer smooth union nipple is fixed outside, the latter nipples are fitted by collar gaskets near the open end providing for pairwise telescopic sealed connection of the union nipples with mating branch pipes forming a ring-shaped channel which communicates with the central channels via the axial channels of the couplings and with intertube channels of pairwise connected internal and external pipes via the peripheral channels. For this purpose the open ends of the union nipples are provided with outer guiding cones, and the open ends of the branch pipes - with inner guiding cones to catch the union nipples at their axial connection.

EFFECT: fast replacement of geophysical equipment.

4 cl, 2 dwg

Description

The invention relates to mechanical engineering, in particular to quick-disconnect connections of multichannel pipes, ensuring the normal operation of installations, and can be used when completing exploration and development wells that require a quick change of geophysical equipment.

Known for the docking station of multichannel pipelines containing installed on the ends of the inner tubes of an elastic sleeve having a supporting flange with windows for fluid flow. The supporting flange is made of elastic material in one piece with the body of the sleeve and is located between the thrust surfaces of the threaded connection of the outer pipes connected by a sleeve. The elastic sleeve is reinforced with two rows of longitudinal plates located with overlapping gaps between the plates of one row with the plates of the other row. For ease of installation, the inner tubes are preliminarily threaded from one end into the outer tubes. At the other end of the inner pipes, a ring is mounted that slides freely along the inner surface of the outer pipe. The rings have windows for the passage of flushing fluid. Due to the gaps, the plates prevent the extrusion of the elastic seal material into the gaps between the ends of the pipes, thereby ensuring high sealing strength (Copyright certificate SU No. 1361296. Device for connecting double drill string pipes. - IPC: E21B 17/18, 17/02. - Publ. 12/23/1987 Bull. No. 47). A disadvantage of the known technical solution is the difficulty of pairing the outer and inner pipes, which requires constant lifting of the pipe string with the packer to the surface, which takes considerable time and high maintenance costs.

Known for the docking station of multichannel pipelines, including external and internal pipes forming three channels, concentrically located relative to each other nodes connecting internal and external pipes with transverse partitions at the ends, and seals. The connection unit of the internal pipes is made in the form of two telescopically mounted pipes in pairs, one end of which is rigidly connected to the connection unit of the external pipes (Copyright certificate SU No. 1105602. Drill string. - IPC: E21B 17/18. - Publish. 30.07.1984. Bull. No. 28). This technical solution is taken as a prototype.

A disadvantage of the known technical solution adopted for the prototype is the complexity of the design, in which the outer and inner pipes have autonomous connections, the connection and disconnection of which requires lifting the pipe string with the packer to the surface, which takes considerable time and high operating costs that reduce efficiency well operation.

The main task to be solved by the claimed invention is directed is to simplify the design of the docking unit, which makes it possible in real time to quickly change the geophysical equipment of the well depending on the physical parameters of the formation fluids to be studied.

The technical result is the reduction of operating costs associated with the completion of exploratory wells.

The specified technical result is achieved by the fact that in the known docking unit of multichannel pipelines containing telescopically mounted with seals pipes and nipples connecting pairs of inner and outer pipes forming central and annular channels, according to the proposed technical solution

the ends of the joined pipes are coaxial and connected to their respective couplings, in each of which there are axial and peripheral longitudinal channels communicating with the central and annular channels of the joined pipes, while on the other side of one of the couplings in the axial channel an inner pipe is fixed and the outside is external pipe, and in the opposite coupling - internal and external smooth nipples, the latter near the free end are equipped with annular cuffs with the possibility of telescoping them in pairs with openings nite pipes with the formation of an annular channel communicating through axial channels of couplings with central and through peripheral channels with annular channels of pairwise joined inner and outer pipes, for which outer guide cones are made on the free ends of the nipples, and inner guide cones for catching on the free ends of the pipes axial coupling nipples;

the free end of the inner pipe is provided with a centering collar of its axial position in the outer nipple, and through the grooves of the collar are made through grooves of communication between the peripheral channels of both couplings through the annular channel;

the free ends of the nipples and nozzles are made at an axial distance equal to at least the depth of the guide cones, with the possibility of alternating their axial joining in pairs with each other;

an annular groove of the trapezoidal profile is made on the inner surface of the outer pipe to engage the pipe with cams of the mounting tool.

The analysis of the prior art by the applicant has made it possible to establish that there are no analogs characterized by sets of features that are identical to all the features of the claimed docking station for multichannel pipelines. Therefore, the claimed technical solution meets the condition of patentability "novelty."

The search results for known solutions in the art in order to identify features that match the distinctive features of the prototypes of the claimed technical solution have shown that they do not follow explicitly from the prior art. From the prior art determined by the applicant, the influence of the transformations provided for by the essential features of the claimed technical solution on the achievement of the specified technical result is not revealed. Therefore, the claimed technical solution meets the condition of patentability "inventive step".

The claimed technical solution can be used in the oil industry to connect pairwise internal and external pipes of well installations. Therefore, the claimed technical solution meets the condition of patentability "industrial applicability".

Figure 1 schematically shows the proposed docking station multi-channel piping assembly; figure 2 is the same in the open position.

The docking unit of multi-channel pipelines contains a pair of couplings 1 and 2, connected on one side with pairwise joined inner tubes 3 and 4 and outer tubes 5 and 6, respectively, with central channels 7 and annular channels 8, the ends of which are located coaxially between each other. In each of the couplings 1 and 2, an axial channel 9 is made, communicating with the central channel 7, and peripheral longitudinal channels 10, communicating with the annular channel 8 of the inner tubes 3 and 4 joined in pairs and the outer tubes 5 and 6. On the other side of one of the couplings, for example, couplings 1, an inner pipe 11 is fixed in the axial channel 9, and an outer pipe 12 is fixed outside the coupling 1. In the opposite coupling 2, an smooth inner nipple 13 is fixed to the axial channel 9, provided with ring cuffs 14 located near the free end of the nipple 13, and c outside the sleeve 2, an external smooth nipple 15 is fixed, equipped with annular cuffs 16 located near the free end of the nipple 15, with the possibility of pairwise telescopic hermetic connection of the nipples 13 and 15 with the mating tubes 11 and 12 with the formation of an annular channel 17 communicating through the peripheral channels 10 with the annular channels 8 pairwise joined inner tubes 3 and 4 and outer tubes 5 and 6. Telescopically pairwise joined inner nipple 13 with inner branch pipe 11 forms a communication channel between the central channels 7 in the inner pipes 3 and 4 through the axial channels 9 of the couplings 1 and 2 (Figure 1). To increase the reliability of joining in pairs of nipples 13 and 15 with nozzles 11 and 12, outer guide cones 18 and 19 are made on the free ends of the nipples 13 and 15, and inner guide cones 20 and 21 are used on the free ends of the nozzles 11 and 12 to catch the ends of the nipples 13 and 15 with axial docking. The free end of the inner pipe 11 is provided with a centering collar 22 of its axial position in the outer nipple 15. On the periphery of the collar 22 there are through grooves 23 of the communication between the peripheral channels 8 of both couplings 1 and 2 through the annular channel 17. The free ends of the nipples 13 and 15 and the pipes 11 and 12 are made at an axial distance l equal to at least a depth h of the guide cones on the nipples 13 and 15 and on the nozzles 11 and 12, i.e. l≥h, with the possibility of alternating their axial docking in pairs with each other. On the inner surface of the outer pipe 12, an annular groove 24 of the trapezoidal profile is made for engaging the pipe 12 with the cams of an installation tool (not shown) (Figure 2).

Docking node multichannel pipelines works as follows.

The inner pipes 3 and 4 and the outer pipes 5 and 6 are joined in pairs in the axial direction by alternately telescoping the inner pipe 11 and the outer pipe 12 connected to the coupling 1, on the one hand, to the internal smooth nipple 13 and the external smooth nipple 15 connected to the coupling 2, on the other hand, is hermetically sealed by means of ring cuffs 14 and 16. In this case, the end of the outer nipple 15 is first pre-inserted with the outer guide cone 19 into the inner guide cone 21 at the end of the outer pipe 12, thereby capturing at the end of the nipple 15 when they are axially joined, after which the axial sliding of the nipple 15 inside the pipe 12 at a length l is continued. Then, the end of the inner nipple 13 with the outer guide cone 18 is inserted into the inner guide cone 20 at the end of the inner pipe 11, thereby catching the end of the nipple 13, after which the axial sliding of the nipple 15 with the ring cuffs 16 inside the pipe 12 and the nipple 13 with the ring cuffs 14 inside continues pipe 11, the latter during axial docking, in turn, penetrates the centering collar 22 into the external nipple 15, thereby fixing the axial position of the pipe 11 in the external nipple 15. Thus, the docking pairs of inner and outer tubes of multi-channel pipeline without imposing additional constraints.

During the supply of various agents in the well, flows move along the channels of the docking unit between the central and annular channels of the multichannel pipeline.

The extraction of the downhole equipment is carried out in turn: first, the upper part with the sleeve 2 is removed with nipples 13 and 15 using a multi-channel pipe, then the lower part is removed with the mounting tool, cams hooking on the annular groove 24 of the trapezoidal profile on the inner surface of the outer pipe 12.

The proposed docking unit of multichannel pipelines is characterized by speed and increased reliability of sealing cavities of paired pipes, which dramatically reduces operating costs.

Claims (4)

1. Docking assembly of multichannel pipelines, containing telescopically mounted pipes and seals and nipples for pairwise connecting inner and outer pipes forming central and annular channels, characterized in that the ends of the joined pipes are coaxial and connected to their respective couplings, in each of which axial and peripheral longitudinal channels communicating with the central and annular channels of the joined pipes, while on the other side of one of the couplings in the axial channel is fixed inside the front pipe and the outside pipe are the external pipe, and in the opposite sleeve there are internal and external smooth nipples, the latter near the free end are equipped with ring cuffs with the possibility of telescoping them in pairs with mating pipes with the formation of an annular channel communicating through the axial channels of the couplings with the central and peripheral channels with annular channels of pairwise joined inner and outer pipes, for which outer guide cones are made on the free ends of the nipples, and on the free pipe ends - internal guide cones for catching nipples during axial docking. 2. The connecting assembly according to claim 1, characterized in that the free end of the inner pipe is provided with a centering collar of its axial position in the outer nipple, and through the grooves of the collar are made through the communication grooves between the peripheral channels of both couplings through the annular channel. 3. The docking node according to claim 1, characterized in that the free ends of the nipples and nozzles are made at an axial distance equal to at least the depth of the guide cones with the possibility of alternating their axial docking in pairs with each other. 4. The docking assembly according to claim 1, characterized in that an annular groove of the trapezoidal profile is made on the inner surface of the outer pipe to engage the pipe with cams of the mounting tool.

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