RU2013518C1 - Wellhead packing device for flexible strap pulling member sealing - Google Patents

Abstract

FIELD: oil producing industry. SUBSTANCE: device includes detachable hollow cylindric body 1 mounted on T- joint 8 and having side branch pipes 2 with clamp nuts 7. Cylindric sleeves 4 (with seals 5) and spring-actuated and collar bushes 6 are disposed inside branch pipes 2. Cooling unit of pulling member 9 is mounted in body 1 below seals 5. The cooling unit is made in the form of removable cover 3 with hinged half-yokes 15. Shaped cylinder 10 is attached to cover 3 and connected to cooling device 12. Cylinder 10 is provided with an axial to accommodate pulling member 9 and with channels 11. The channels are hydraulically connected to the cooling device pipe lines i which cooling agent is circulating. Bode 1 is provided with a window having its vertical lateral sides coinciding with the vertical plane passing through the axis of body 1. A centering assembly of pulling member 9 is disposed below cylinder 10 and is made in the form of rollers 13. A cleaning assembly is placed above cylinder 10 and is made in the form of scrapers 14. Rollers 13 and scrapers 14 are mounted in cover 3 symmetrically to the axial groove of cylinder 10 on axles for rotation and engaging pulling member 9. Cylinder 10 is disposed in body 1 at the window level for engaging its vertical lateral surfaces. As the down-the-hole equipment is running in, cover 3 and sleeves 4 are extracted. After the down-the-hole equipment is run in, pulling member 9 is sealed by seals 5, cover 3 with cylinder 10 is mounted on body 1, with pulling member 9 entering axial groove of cylinder 10. Cooling agent is supplied to channels 11. Rollers 13 center pulling member 9 relative cylinder 10. Scrapers 14 clean pulling member 9 from sticked to it formation fluid. EFFECT: enlarged operating capabilities. 3 dwg

Description

 The invention relates to the mining industry and can be used to seal the mouth of oil wells operated using long-stroke deep-well pumping units (DGU).

 A gland device for sealing a tape traction body [1] is known, in which an automatic change in the gap between the traction body and the rollers burning it is achieved.

 However, this device is structurally difficult and unreliable in operation, as it is designed for the ideal shape of the tape. Defects of the latter: crescent, grooves, etc. - do not allow for reliable sealing of the wellhead.

 Closest to the proposed (prototype) is a wellhead sealing device [2] containing a hollow cylindrical body mounted on a tee, having side nozzles in which cylindrical clips with glands are placed. The tightness of the seals is carried out using spring-loaded chest bolts and pressure nuts. The disadvantages of the device include the low efficiency of the seals, due to their increased wear during the progressive movement of a flexible tape traction body. Defects of manufacture of the latter: crescent, grooves, etc. - practically cannot be eliminated in the future. Because of this, it is impossible to carry out reliable sealing of the traction body. With an increase in the degree of tightening of the seals, their wear is proportionally increased. The short life of the oil seals reduces the efficiency of the diesel generator set, requires frequent inspection and replacement of the oil seals, and increases the risk of environmental pollution by formation fluid.

 The aim of the invention is to increase the reliability of the device by improving the degree of sealing of the wellhead.

 This goal is achieved in that the device containing the detachable hollow cylindrical body mounted on the tee with push nuts and side nozzles having cylindrical clips housed in them with glands and spring-loaded packing followers is equipped with nodes for centering the traction body, cleaning and cooling it, the last of which is made in the form of a removable cover with hinged half-clamps, rigidly connected with a figured cylinder, which is connected to a refrigeration unit having pipelines for cooling circulation a supplying agent, and in the figured cylinder, an axial groove is made to accommodate the traction body and channels for the circulation of the cooling agent, which are hydraulically connected to the piping of the refrigeration unit, while the housing is made with a window, the vertical side surfaces of which coincide with the vertical plane passing through the axis the body, the centering and cleaning nodes of the traction body are located below and above the figured cylinder and are made respectively in the form of axles installed in the cover on the axle with the possibility of rotation of the role s and scrapers, rollers and scrapers which are arranged symmetrically with respect to the axial groove in figure cylinder and are able to interact with the drive elements, wherein the shaped cylinder is mounted in the housing at the level of the window to interact with its vertical side surfaces.

 A comparative analysis of the known technical solutions showed that the proposed device meets the criteria of "novelty" and "significant differences".

 In FIG. 1-3 shows the proposed device.

 The device consists of a detachable hollow cylindrical body 1 with side nozzles 2 and a removable cover 3, sealed relative to the housing 1. In the side nozzles 2 are mounted cylindrical rings 4 with seals 5 and spring-loaded packing rings 6. The nozzles 2 are closed externally with compression nuts 7 to tighten the oil seals 5. The housing 1 is placed on the tee 8. A flexible tape traction body 9 passes in the housing 1 and is sealed at the mouth with the help of glands 5.

 Under the oil seals 5 in the housing 1 there are cooling, centering and cleaning units of the traction member 9. The cooling unit is made in the form of a figured cylinder 10 rigidly attached to the cover 3 from a material with high thermal conductivity. In the figured cylinder 10 there is an axial groove for accommodating the traction member 9 and the channel 11 for circulating the cooling agent. A refrigeration unit 12 is connected to the cover 3 and the figured cylinder 10. Its pipelines are hydraulically connected to the channels 11 in the figured cylinder 10.

 Below the cooling unit there is a centering unit for the traction unit 9 in the form of rollers 13, and above it is a cleaning unit in the form of scrapers 14. The rollers 13 and the scrapers 14 are mounted rotatably on the axes on the cover 3 symmetrically with respect to the axial groove in the figured cylinder 10 and have the possibility of interaction with traction body 9.

 A window is cut out in the housing 1, which is closed by a removable cover 3. To fix the cover 3 on the housing 1, half-clips 15 are pivotally connected to it. The window in the housing 1 is designed so that its vertical side surfaces coincide with the vertical plane passing through the axis of the housing 1. Figure the cylinder 10 is installed in the housing 1 at the window level and can interact with its vertical side surfaces.

 The rollers 13 center the traction member 9, preventing its direct interaction with the figured cylinder 10. The scrapers 14 help to clean the traction member 9 from the formation fluid adhering to it. The selected shape of the scrapers 14 allows them to freely pass the traction body 9 when it moves down and to interact tightly with the outer surface of the traction body 9 when it moves up. The shape of the scrapers 14 eliminates the possibility of jamming in them of the traction body 9.

 The device operates as follows.

 Before the descent of the downhole equipment (not shown), the cylindrical casing 4 is removed from the nozzles 2 of the housing 1, and the cover 3 is removed. Due to this, the internal cavity of the housing 1 allows you to lower the necessary downhole equipment into the well on the traction body 9. After its descent, the cover 3 together with the figured cylinder 10 and the refrigeration unit 12 are installed in their place and fixed on the housing 1 with the help of clamps 15. The traction body 9 is then placed in the axial groove of the figured cylinder 10. In the nozzles 2, clips 4 with glands are installed 5 and ground boxes 6. By tightening the pressure nuts 7, the wellhead is sealed around the traction member 9.

 In the channels 11 from the refrigeration unit 12 serves a cooling agent. After that, the diesel generator set is put into operation. When spouting reservoir fluid through a tee 8 at the wellhead, overpressure occurs. Using a cooling unit, the formation fluid located under the gland 5 is cooled, significantly increasing its viscosity. The rollers 13 contribute to the mutual centering of the traction body 9 relative to the figured cylinder 10. The scrapers 14 prevent the removal of the cooled formation fluid adhering to the traction body 9 through the seals 5.

 If it is necessary to lift the downhole equipment, the clips 4 with oil seals 5 are removed from the nozzles 2, the cover 3 is removed and the downhole equipment can freely pass through the housing 1.

 The proposed device increases the degree of sealing of the wellhead, facilitates the maintenance of wellhead seals and reduces the likelihood of environmental pollution.

Claims (1)

 The mouth SEALING DEVICE FOR SEALING A FLEXIBLE TAPE BRAKE BODY containing a detachable hollow cylindrical body located on the tee with pressure nuts and side pipes with cylindrical clips installed in them with glands and a spring loaded cooling unit that has cooling compartments removable cover with articulated half-clamps, a refrigeration unit with pipelines for circulation of the cooling agent, a figured cylinder with an axial groove for For placement of a traction body and channels for circulation of a cooling agent, which are hydraulically connected to the piping of the refrigeration unit, a centering unit of the traction body made in the form of rollers mounted on the cover, a cleaning unit made in the form of scrapers mounted on the cover, the casing is made with a window, the side surfaces of which are parallel to the axis of the casing, the figured cylinder is installed in the casing at the window level with the possibility of interaction with its side surfaces, centering nodes and very stki placed above and below the figure of the cylinder, and rollers, and scrapers are mounted on the cover rotatably mounted on axes and arranged symmetrically with respect to the axial groove of the cylinder of figure to engage with the traction body.

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