Seal device of oil pumping machine well elastic dynamic seal well head
A technology for pumping wells and sealing devices, which is applied in sealing/isolation, wellbore/well parts, earthwork drilling and production, etc., and can solve problems such as increased crude oil production costs, increased energy consumption, and increased frictional resistance
Active Publication Date: 2008-12-24
DAQING OILFIELD CO LTD +1
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Problems solved by technology
[0003] However, in the actual application process, the sealing effect is directly proportional to the tightening degree of the packing, that is, to ensure a good sealing effect, the packing must be tightened, and the friction between the O-shaped rubber ring and the polished rod after the packing is tightened Increased resistance increases the energy consumption generated by the packing seal, which in turn increases the cost of crude oil extraction
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[0022] Such as figure 2 As shown, the pumping well elastic and dynamic sealing wellhead sealing device of the present invention comprises:
[0023] A packing box 6, the outer side of its upper part has threads, the lower part is open, and the inner side has a screw thread for connecting to the existing wellhead;
[0024] The cup body 4 is built into the packing box 6. There are a plurality of elongated openings 41 on the side wall of the cup body 4. There is an interval between the side wall of the cup body 4 and the inner wall of the packing box 6. The upper edge of the cup body 4 is in contact with the disc The upper edge of the root box 6 is pressed against each other;
[0025] A lined steel frame 2, on which an elastic sealing sleeve 3 is set, the elastic sealing sleeve 3 is built in the cup body 4, and the upper edge of the elastic sealing sleeve 3 is pressed against the edge of the cup body 4;
[0026] A plurality of sealing rings 5 are graphite sealing rings, and e...
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The invention discloses an elastic dynamic seal wellhead sealing device for oil pumping wells, comprising a press cap, a lining steel skeleton, a cup body, a plurality of sealing rings and a packing box, wherein an elastic sealing sleeve is arranged on the lining steel skeleton; the sealing rings are respectively provided with a 45-degree oblique mouth and are arranged inside the elastic sealing sleeve in a mode with the oblique mouth positions staggered for 180 degrees; the elastic sealing sleeve is arranged inside the cup body; the cup body is arranged inside the packing box; and the lower part of the packing box is provided with a screw thread connected with the prior wellhead. The pressure inside a well is transmitted to the elastic sealing sleeve through the bottom of the packing boxand a hole of the cup body, and then the elastic sealing sleeve contracts upon stress, so as to squeeze the sealing rings, the clearance between the sealing rings and a polish rod is contracted to strengthen sealing, which changes sealing conditions along with the pressure changes inside the well and dynamically adjusts the frictional resistance between the sealing rings and the polish rod along with the pressure changes inside the well. The sealing device solves the problem that the prior wellhead sealing device is high in frictional resistance, thereby reducing consumed energy.
Description
technical field [0001] The invention relates to a wellhead sealing device for an oil pumping well, in particular to an elastic and dynamic sealing wellhead sealing device for an oil pumping well. Background technique [0002] The wellhead seal of the pumping well usually adopts the packing seal, which is composed of multiple O-shaped rubber rings. figure 1 As shown, each O-shaped rubber ring 11 cuts a 45° bevel 15, and then staggers it by 180° according to the bevel position and installs it in the packing box 12, and the pressing cap 13 is screwed tightly to compress the packing sealing polished rod 14. [0003] However, in the actual application process, the sealing effect is directly proportional to the tightening degree of the packing, that is, to ensure a good sealing effect, the packing must be tightened, and the friction between the O-shaped rubber ring and the polished rod after the packing is tightened The resistance increases, and the energy consumption generated b...
Claims
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Inventor 韩修廷董喜贵刘建军刘卫东周方惠郑国忠贾志平侯德艳
Owner DAQING OILFIELD CO LTD