A wellhead oil scraping and cleaning device for the outer wall of an oil pipe

Abstract

The present invention relates to a device, and specifically to a wellhead oil scraping and cleaning device for the outer wall of an oil pipe. The technical scheme of the present invention is as follows: A wellhead oil scraping and cleaning device for the outer wall of an oil pipe, comprising a shell, a pressure cap, a pressure ring, a self-sealing core of an oil pipe, a nozzle shell, a nozzle, a water inlet high-pressure ball valve and a blowout prevention mechanism, wherein an inclined platform is provided on the upper part of the inner wall of the shell, the pressure cap is installed on the upper end of the shell, and the pressure cap presses the self-sealing core of the oil pipe on the inclined platform through the pressure ring; the nozzle shell is installed on the lower part of the inner wall of the shell, and a plurality of nozzles are evenly inlaid on the nozzle shell; the side of the shell is connected to the water inlet high-pressure ball valve; the blowout prevention mechanism is used to prevent blowout and well gushing accidents. The wellhead oil scraping and cleaning device for the outer wall of an oil pipe provided by the present invention can scrape and clean the outer wall of the oil pipe while lifting the oil pipe, so as to realize pollution-free operation of conventional well repair and pump inspection operations.

Description

Technical Field

[0001] The invention relates to a device, in particular to a device for scraping and cleaning oil from an outer wall of an oil pipe at a wellhead. Background Art

[0002] At present, during well repair and pump inspection operations in oil fields, the oil pipes pulled out from the oil wells are always stained with residual oil, and the pulled out oil pipes are discharged on the ground at the construction well site. Although some anti-pollution measures have been taken, such as laying anti-seepage plastic sheets under the oil pipes, there is still a risk of ground environmental pollution. Summary of the invention

[0003] The invention provides an oil pipe outer wall wellhead oil scraping and cleaning device, which can scrape oil and clean the outer wall of the oil pipe while lifting the oil pipe, so as to realize pollution-free operation of conventional well repair and pump inspection operations.

[0004] The technical solution of the present invention is as follows:

[0005] A wellhead oil scraping and cleaning device for the outer wall of an oil pipe comprises a shell, a pressure cap, a pressure ring, a self-sealing core of the oil pipe, a nozzle shell, a nozzle, a water inlet high-pressure ball valve and a blowout prevention mechanism, wherein an inclined platform is provided on the upper part of the inner wall of the shell, the pressure cap is mounted on the upper end of the shell, and the pressure cap presses the self-sealing core of the oil pipe onto the inclined platform through the pressure ring; the nozzle shell is mounted on the lower part of the inner wall of the shell, and a plurality of the nozzles are evenly inlaid on the nozzle shell; the side of the shell is connected to the water inlet high-pressure ball valve; and the blowout prevention mechanism is used to prevent blowouts and well gushing accidents.

[0006] The oil scraping and cleaning device for the outer wall of the oil pipe, its preferred embodiment is that the blowout prevention mechanism includes a blowout prevention flange, a hanging joint, a high-pressure cock, a lifting short circuit and M30 bolts, the lower part of the blowout prevention flange is connected to the hanging joint, the upper part of the blowout prevention flange is connected to the high-pressure cock, and the upper part of the high-pressure cock is connected to the lifting short circuit; when in use, the blowout prevention flange is connected to the pressure cap through the M30 bolts, and the hanging joint is connected to the oil pipe.

[0007] The oil scraping and cleaning device for the outer wall of the oil pipe, its preferred embodiment is that the outer wall of the nozzle housing is provided with an annular groove, the outer wall of the nozzle housing is tightly engaged with the inner wall of the housing, and a water inlet chamber is formed at the annular groove; the lower end of the nozzle housing is evenly provided with a plurality of water outlet holes along the circumference, the water outlet holes are communicated with the water inlet chamber, and the nozzle is embedded at the end of the water outlet hole; the water inlet high-pressure ball valve is communicated with the water inlet chamber.

[0008] The oil scraping and cleaning device for the outer wall of the oil pipe, its preferred embodiment is that the material of the oil pipe self-sealing core is oil-resistant rubber; the middle section of the oil pipe self-sealing core is a circular sleeve shape, and the two ends are respectively trumpet-shaped; the inner hole of the middle section of the oil pipe self-sealing core and the oil pipe can be fitted and installed; an annular pointed protrusion is provided at one end of the oil pipe self-sealing core, and the annular pointed protrusion is fitted and installed with the inclined platform.

[0009] The working process of the above-mentioned oil scraping and cleaning device for the outer wall of the oil pipe is as follows: the high-temperature steam and hot water output by the steam boiler pump truck is used to pump the high-temperature steam and hot water into the water inlet cavity formed by the shell and the nozzle shell through the water inlet high-pressure ball valve connected to the side of the shell; the high-temperature steam and hot water is sprayed to the outer wall of the oil pipe through the nozzle, and the impact force generated by the temperature of the high-temperature steam and hot water and the speed of the nozzle spraying fluid is used to wash the crude oil on the outer wall of the oil pipe; at the same time, the residual oil on the outer wall of the oil pipe is scraped clean by the oil pipe self-sealing core during the lifting process; and the sewage and crude oil generated during the cleaning process flow into the casing annulus.

[0010] The beneficial effects of the present invention are as follows: the oil pipe outer wall wellhead scraping and cleaning device of the present invention can scrape oil and clean the outer wall of the oil pipe while lifting the oil pipe, so as to realize pollution-free operation of conventional well repair and pump inspection operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a structural diagram of a wellhead oil scraping and cleaning device for the outer wall of an oil pipe without a blowout prevention mechanism;

[0012] Figure 2 This is the structural diagram of the blowout prevention mechanism;

[0013] Figure 3 It is the structural diagram of the nozzle housing;

[0014] Figure 4 for Figure 3 Cross-section along BB direction;

[0015] Figure 5 This is the structural diagram of the oil pipe self-sealing core;

[0016] Figure 6 This is a schematic diagram of the on-site installation and working status of the wellhead oil scraper and cleaning device on the outer wall of the oil pipe;

[0017] Figure 7 Schematic diagram of the wellhead oil scraping and cleaning device for the outer wall of the oil pipe with part of the blowout preventer installed. DETAILED DESCRIPTION

[0018] like Figure 1-7As shown, a wellhead oil scraping and cleaning device for the outer wall of an oil pipe comprises a shell 1, a pressure cap 2, a pressure ring 3, an oil pipe self-sealing core 4, a nozzle shell 5, a nozzle 6, a water inlet high-pressure ball valve 7 and a blowout prevention mechanism. The upper part of the inner wall of the shell 1 is provided with an inclined platform, the pressure cap 2 is installed at the upper end of the shell 1, and the pressure cap 2 presses the oil pipe self-sealing core 4 on the inclined platform through the pressure ring 3; the material of the oil pipe self-sealing core 4 is oil-resistant rubber; the middle section of the oil pipe self-sealing core 4 is a circular sleeve shape, and the two ends are respectively in a trumpet shape; the inner hole of the middle section of the oil pipe self-sealing core 4 can be fitted with the oil pipe 16; an annular sharp protrusion 15 is provided at one end of the oil pipe self-sealing core 4, and the annular sharp protrusion 15 is fitted with the inclined platform; the nozzle shell 5 is installed at the lower part of the inner wall of the shell 1, and the outer wall of the nozzle shell 5 is provided with an annular groove 14, and the outer wall of the nozzle shell 5 is fitted with the shell 1 The inner wall of the nozzle housing 5 is tightly connected, and the annular groove 14 forms a water inlet chamber; the lower end of the nozzle housing 5 is evenly provided with twelve water outlet holes 13 along the circumference, and the water outlet holes 13 are communicated with the water inlet chamber, and the nozzle 6 is embedded at the end of the water outlet hole 13; the side of the housing 1 is connected to the water inlet high-pressure ball valve 7, and the water inlet high-pressure ball valve 7 is communicated with the water inlet chamber; the blowout prevention mechanism includes a blowout prevention flange 10, a hanging joint 11, a high-pressure cock 9, a lifting short circuit 8 and an M30 bolt 12, the lower part of the blowout prevention flange 10 is connected to the hanging joint 11, the upper part of the blowout prevention flange 10 is connected to the high-pressure cock 9, and the upper part of the high-pressure cock 9 is connected to the lifting short circuit 8; the blowout prevention mechanism is used to prevent blowouts and well gushes; when used, such as Figure 7 As shown, the blowout prevention flange 10 is connected to the pressure cap 2 via M30 bolts 12 , and the suspension joint 11 is connected to the oil pipe 16 .

[0019] like Figure 6 As shown, the working process of the above-mentioned oil pipe outer wall wellhead scraper cleaning device is as follows:

[0020] 1) The flange on the housing 1 is connected to the large four-way 17 of the Christmas tree to complete the installation of the oil pipe outer wall scraping and cleaning device.

[0021] 2) The water inlet high-pressure ball valve 7 is connected to the steam boiler pump truck through the water inlet pipeline 18.

[0022] 3) The first oil pipe 16 is pulled out from the well, and the steam boiler pump truck inputs high-temperature steam and hot water into the annular water inlet cavity formed by the shell 1 and the nozzle shell 5 through the water inlet high-pressure ball valve 7, and flushes the oil pipe 16 through the nozzle 6.

[0023] 4) The oil pipe 16 is lifted up, and the oil pipe self-sealing core 4 is used to scrape the residual oil stains on the outer wall of the oil pipe 16.

[0024] 5) Each oil pipe 16 is flushed and scraped of oil until all the oil pipes 16 are removed.

[0025] 6) When a blowout or well kick accident occurs, the blowout prevention flange 10 is connected to the pressure cap 2 via the M30 bolts 12, the suspension joint 11 is connected to the oil pipe 16, and the high-pressure cock 9 is closed.

Claims

1. A wellhead oil scraping and cleaning device for the outer wall of an oil pipe, characterized in that: It includes a shell, a pressure cap, a pressure ring, a self-sealing core of the oil pipe, a nozzle shell, a nozzle, a water inlet high-pressure ball valve and a blowout prevention mechanism. The upper part of the inner wall of the shell is provided with an inclined platform. The pressure cap is installed at the upper end of the shell. The pressure cap presses the self-sealing core of the oil pipe on the inclined platform through the pressure ring; the nozzle shell is installed at the lower part of the inner wall of the shell, and a plurality of nozzles are evenly inlaid on the nozzle shell; the side of the shell is connected to the water inlet high-pressure ball valve; the blowout prevention mechanism is used to prevent blowouts and well kicks; The outer wall of the nozzle housing is provided with an annular groove, the outer wall of the nozzle housing is tightly joined with the inner wall of the housing, and a water inlet cavity is formed at the annular groove; a plurality of water outlet holes are evenly arranged along the circumference of the lower end of the nozzle housing, the water outlet holes are communicated with the water inlet cavity, and the nozzle is embedded at the end of the water outlet hole; the water inlet high-pressure ball valve is communicated with the water inlet cavity; The material of the oil pipe self-sealing core is oil-resistant rubber; the middle section of the oil pipe self-sealing core is a circular sleeve shape, and the two ends are respectively trumpet-shaped; the inner hole of the middle section of the oil pipe self-sealing core can be fitted with the oil pipe; an annular pointed protrusion is provided at one end of the oil pipe self-sealing core, and the annular pointed protrusion is fitted with the ramp.

2. The oil scraping and cleaning device for the outer wall of the oil pipe according to claim 1, characterized in that: The blowout prevention mechanism comprises a blowout prevention flange, a suspension joint, a high-pressure cock, a lifting short circuit and M30 bolts. The lower part of the blowout prevention flange is connected to the suspension joint, the upper part of the blowout prevention flange is connected to the high-pressure cock, and the upper part of the high-pressure cock is connected to the lifting short circuit. When in use, the blowout prevention flange is connected to the pressure cap through the M30 bolts, and the suspension joint is connected to the oil pipe.

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