CN202731811U - Oil pumping well polished rod anti-eccentric wear sealed packing box - Google Patents

Abstract

The packing box is used in oil well head for oil extraction. Is characterized in that: a partition wall is arranged in the middle of the cylindrical shell, and a central hole is formed in the partition wall; an inner cylinder is arranged in a cylindrical cavity in the shell and at the lower part of the partition wall, and the diameter of a central hole at the bottom of the upper end of the inner cylinder is 2-5 mm larger than that of the polished rod; a secondary sealing packing is arranged in the inner cylinder; the lower wall of the shell is symmetrically provided with deviation adjusting screws; a primary sealing packing is arranged in a cylindrical cavity in the shell and at the upper part of the partition wall; the upper part of the upper plane of the first-stage sealing packing is provided with a nylon lining; a pressing cap is sleeved on the outer wall of the nylon lining; a gland is arranged on the upper plane of the gland and the nylon lining. The effect is as follows: the deviation adjusting screw is used for adjusting, so that the problem of eccentric wear of a polished rod and a packing box of the oil pumping unit is solved. The leakage of oil gas at the well mouth is reduced, the environmental pollution is reduced, and the yield loss caused by the production stop of the oil well due to the leakage of the oil gas is reduced.

Description

Oil pumping well polished rod anti-eccentric wear sealed packing box

technical field

The utility model relates to the technical field of oil production equipment in an oil field, in particular to a sealed packing box for a polished rod at the head of an oil pumping well, which is a sealed packing box for preventing partial wear of a polished rod in an oil pumping well. Service life of polished rod and packing box.

Background technique

At present, in the rod pump oil production method, the blowout prevention facilities at the oil production wellhead are composed of rubber gates, packing boxes, packing, packing pressure caps, packing box outer glands, etc. Wellhead sealing of pumping wells during production. The packing is made of rubber, and the polished rod is made of steel. With the lubricating effect of lubricating oil, it can achieve a good wellhead seal theoretically. However, in actual production, the polished rod not only rubs against the packing, but sometimes also rubs against the packing cap. Since both are made of steel, it is easy to cause damage to the smooth surface of the polished rod, affecting the sealing effect between the polished rod and the packing, resulting in Oil and gas leaks at the wellhead, and the polished rod needs to be replaced when the polished rod is severely damaged. The reasons for the friction between the polished rod and the packing pressure cap are as follows: first, the packing pressure cap is skewed when the packing pressure cap is pressed against the rubber packing, and then rubs against the polished rod; Due to loose soil in the Gobi Desert, loose ore caused by pumping unit vibration and mechanical wear, the rope suspension device of the pumping unit is displaced, causing the polished rod to deflect and rub against the packing cap. At present, there are two main means to solve the eccentric wear: one is to fix and adjust the pumping unit to keep the polished rod in the center as much as possible; the other is to use the packing box to fine-tune the top wire to adjust the packing box so that the packing pressure cap is in the center. From the actual application effect, because the stability of the pumping unit is not ideal, it is difficult to keep the polished rod in the center. Due to the continuous wear and tear of the packing, the packing pressure cap is constantly moving, so that the packing pressure cap cannot maintain the centered state. The above two methods have unsatisfactory effects in practical application, causing serious damage to the sealing surface of the polished rod, causing oil and gas leakage at the wellhead, causing the oil well to stop production, polluting the environment, and affecting safe production. When the polished rod is seriously damaged, it is necessary to depressurize the oil well and replace the polished rod, which is labor-intensive and increases the cost of oil production.

Utility model content

The purpose of the utility model is to provide an anti-eccentric wear sealing packing box for the polished rod of an oil pumping well, so as to solve the problem of polished rod wear caused by the eccentric wear of the well head during the oil production process of the rod pump.

The technical solution adopted by the utility model is: the anti-eccentric wear sealing packing box of the polished rod of the pumping well, including the gland, the connecting cylinder, the pressure cap, the nylon lining, the shell, the first-level sealing packing, the inner cylinder, the adjustment screw and The secondary sealing packing is characterized in that: a partition wall is arranged in the middle of the cylindrical shell, and the partition wall has a central hole through which the polished rod can pass. There is an inner cylinder in the cylindrical cavity at the lower part of the housing and the partition wall. The upper end of the inner cylinder has a bottom, and the upper end of the inner cylinder has a central hole. The diameter of the central hole at the upper end of the inner cylinder is 2 to 5 mm larger than the diameter of the polished rod ; There is a secondary sealing packing in the inner cylinder; there are symmetrical screw holes on the lower wall of the shell, and a deviation adjustment screw is connected in the screw hole, and the inner end of the deviation adjustment screw is pushed against the outer wall of the inner cylinder; The screw can make the inner cylinder move in the housing. There is a first-level sealing packing in the cylindrical cavity inside the shell and on the upper part of the partition wall; there is a nylon lining on the upper plane of the first-level sealing packing, and the nylon lining is composed of two half linings, two and a half The inner liner is relatively composed of a cylinder with a tapered outer wall, and the nylon inner liner has a central hole; a pressure cap is set on the outer wall of the nylon inner liner, and the pressure cap has a tapered central hole; the pressure cap and the nylon liner There is a gland on the upper plane of the inner liner, the outer wall of the gland is threaded, the gland thread is fixed on the upper end of the connecting cylinder, and the gland has a central hole.

Beneficial effects of the utility model: the utility model uses the anti-eccentric wear sealing packing box of the polished rod of the pumping well, and uses the deviation adjusting screw to adjust, so as to solve the problem of eccentric wear of the polished rod and the packing box of the pumping unit. The oil and gas leakage at the wellhead is reduced, the environmental pollution is reduced, and the production loss caused by the shutdown of the oil well due to the oil and gas leakage is reduced.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the structure of the polished rod anti-eccentric wear sealing packing box of the utility model of the pumping well.

In the figure, 1-gland, 2-connecting cylinder, 3-pressure cap, 4-nylon lining, 5-housing, 6-primary sealing packing, 7-inner cylinder, 8-adjustment screw, 9- Secondary sealing packing, 10-polished rod.

Detailed ways

Embodiment 1: Taking a pumping well polished rod anti-eccentric wear sealing packing box as an example, the utility model is further described in detail.

See Figure 1. The utility model oil pumping well polished rod anti-eccentricity sealing packing box includes a gland 1, a connecting cylinder 2, a pressure cap 3, a nylon lining 4, a shell 5, a first-stage sealing packing 6, an inner cylinder 7, and a deflection adjustment screw 8 and secondary sealing packing 9.

There is a partition wall in the middle part of the cylindrical housing 5, and the partition wall has a central hole with a diameter of 32mm, and the polished rod can pass through the central hole of the partition wall. There is an inner tube 7 in the cylindrical cavity of the lower part of the housing 5 and the partition wall. The upper end of the inner tube 7 has a bottom, and the bottom of the upper end of the inner tube 7 has a central hole. The diameter of the central hole at the bottom of the inner tube 7 is 5mm greater than the diameter of the polished rod. There is a secondary sealing packing 9 in the inner cylinder 7 . There are screw holes symmetrically on the lower wall of the housing 5, and a deviation adjustment screw 8 is connected in the screw hole, and the inner end of the deviation adjustment screw 8 is pushed on the outer wall of the inner cylinder 7; There is a first-level sealing packing 6 in the shaped cavity. There is a nylon lining 4 on the upper part of the upper plane of the primary sealing packing 6. The nylon lining 4 is composed of two half linings, and the two half linings are relatively formed into a cylinder with a tapered outer wall. The lining 4 has a central hole; a pressure cap 3 is set on the outer wall of the nylon lining 4, and the pressure cap 3 has a tapered central hole; of the same taper. There is a gland 1 on the upper plane of the gland 3 and the nylon liner 4, the outer wall of the gland 1 is threaded, and the gland 1 is threadedly fixed on the upper end of the connecting cylinder 2, and the gland 1 has a central hole. The lower end of housing 5 is threaded and can be connected with the well head. The polished rod 10 passes through the secondary sealing packing 9 , the upper bottom of the inner cylinder 7 , the partition wall of the casing 5 , the primary sealing packing 6 , the nylon lining 4 and the central hole of the gland 1 .

Claims (1)

1. An anti-eccentric wear sealing packing box for polished rods in oil pumping wells, including a gland (1), a connecting barrel (2), a gland (3), a nylon lining (4), a casing (5), and a primary seal Packing (6), inner cylinder (7), deflection adjustment screw (8) and secondary sealing packing (9), are characterized in that: there is a partition wall in the middle of the cylindrical shell (5), and the partition wall has a center hole, the polished rod can pass through the central hole of the partition wall; there is an inner cylinder (7) in the cylindrical cavity of the lower part of the housing (5) and the partition wall, and the upper end of the inner cylinder (7) has a bottom, There is a central hole at the bottom of the upper end of the inner cylinder (7), and the diameter of the central hole at the upper end of the inner cylinder (7) is 2 to 5 mm larger than the diameter of the polished rod; there is a secondary sealing packing (9) in the inner cylinder (7); (5) There are screw holes symmetrically on the lower wall, and a deviation adjustment screw (8) is connected in the screw hole, and the inner end of the deviation adjustment screw (8) is pushed on the outer wall of the inner cylinder (7); There is a first-level sealing packing (6) in the cylindrical cavity on the top of the inner and partition wall; there is a nylon lining (4) on the upper plane of the first-level sealing packing (6), and the nylon lining (4) has Composed of two half-lines, the two half-lines are relatively formed into a cylinder whose outer wall is tapered, and the nylon liner (4) has a central hole; a pressure cap ( 3), the pressure cap (3) has a tapered central hole; there is a gland (1) on the upper plane of the pressure cap (3) and the nylon lining (4), and the outer wall of the gland (1) has threads , the gland (1) is threadedly fixed on the upper end of the connecting cylinder (2), and the gland (1) has a central hole.

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