Pneumatic isobaric multi-stage sealing device for wellhead of oil pumping unit

A technology for pumping wells and sealing devices, used in sealing/packing, drilling equipment, wellbore/well components, etc., can solve the problems of oil leakage pollution, high frequency of replacement of packing, and large power consumption, etc. Extended service life, long sealing cycle, energy saving effect

Active Publication Date: 2022-06-28
DAQING DANNUO PETROLEUM TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problems that the existing wellhead sealing device consumes a lot of power, oil leakage pollutes the environment, and the frequency of pa

Method used

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  • Pneumatic isobaric multi-stage sealing device for wellhead of oil pumping unit
  • Pneumatic isobaric multi-stage sealing device for wellhead of oil pumping unit
  • Pneumatic isobaric multi-stage sealing device for wellhead of oil pumping unit

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[0023] The present invention will be further described below in conjunction with the accompanying drawings:

[0024] Depend on figure 1 combine Figure 2~3 As shown in the figure, the pneumatic isobaric multi-stage sealing device for the wellhead of the pumping unit includes an upper section 1, the lower end of the upper section 1 is connected to the middle section 2 by flanges and bolts, and a packing 15 is clamped between the upper section 1 and the middle section 2, An air bag 18 is installed in the space between the upper section 1 and the middle section 2 outside the packing 15;

[0025] The more traditional packing box airbag 18 has energy storage function. Inflatable sealing packing is used in the design, which is filled with high-pressure gas, and the packing 15 is pressurized with a continuous and uniform force, and can shrink under the action of pressure to ensure the packing. The close coupling between 15 and the sucker rod avoids the increase in the load of the p...

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Abstract

The invention discloses a pneumatic equal-pressure multi-stage sealing device for a wellhead of a pumping unit. Relates to the technical field of oil-gas well equipment. The lower end of the upper section is connected with the middle section through a flange and a bolt, the packing is clamped between the upper section and the middle section, and the air bag is installed in the space between the upper section and the middle section on the outer side of the packing. The device has the following beneficial effects that the air bag has an energy storage function, the packing is pressurized by continuous and uniform force, close coupling of the packing and a sucker rod is guaranteed, the hollow ball is arranged to be pushed to the center hole along the conical surface of the middle section by the pressure of the bottom of a wellhead after the rod is broken, blowout accidents are prevented, the deviation adjusting and follow-up function mechanism is automatically coaxial with the sucker rod, and the operation is convenient. The eccentric wear phenomenon is avoided, the service life of the packing and the sucker rod is prolonged, the sucker rod pushes the packing box through the centralizing sleeve, the deviation adjusting mechanism and the follow-up mechanism move flexibly along with the sucker rod, it is guaranteed that the follow-up mechanism and the sucker rod work coaxially all the time, eccentric wear is eradicated, and the service life of the sucker rod and the packing is prolonged.

Description

Technical field: [0001] The invention relates to the technical field of oil and gas well equipment, in particular to a pneumatic iso-pressure multi-stage sealing device for a wellhead of a pumping unit. Background technique: [0002] The petroleum industry has been developed for nearly a hundred years, and the wellhead sealing device used for pumping units has also developed simultaneously for nearly a hundred years. Although there are nearly dozens of wellhead seals with different design concepts, different prices, different shapes and types on the market device, its sealing device has the following main problems: [0003] 1. Large power consumption: the function of the packing box is the wellhead sealing device of the annular space between the tubing and the sucker rod. Due to the sealing effect, the process of the packing holding the sucker rod must increase the motor load of the pumping unit; at the same time, the sucker rod is misaligned, swings, and translates, causin...

Claims

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Application Information

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IPC IPC(8): E21B33/03E21B17/10
CPCE21B33/03E21B17/1071
Inventor 高帅
Owner DAQING DANNUO PETROLEUM TECH DEV
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