CN2500793Y

CN2500793Y - Follow-type centralising pumping polish rod well head sealer

Info

Publication number: CN2500793Y
Application number: CN 01233567
Authority: CN
Inventors: 崔学政; 马强; 陈义保
Original assignee: China University of Petroleum East China
Current assignee: China University of Petroleum East China
Priority date: 2001-08-20
Filing date: 2001-08-20
Publication date: 2002-07-17
Anticipated expiration: 2011-08-20

Abstract

The utility model provides a follow-up centering smooth oil pumping rod wellhead sealing device. The outside of a disk-root box body is made into a flange shape and is arranged in a disk-root follow-up mechanism. A concave groove or ring groove is arranged on the disk surface of the flange. An adjusting disk with a convex platform is arranged above the concave groove, or an O shaped rubber ring is arranged in the ring groove. The disk-root box body is arranged on a holding body. The upper end of the holding body is screwed tightly by a pressing cover and the lower end is screwed on the bottom seat of a sluice gate. A rubber sluice gate is arranged under the disk-root sealing follow-up mechanism to seal the wellhead when the upper disk-root is replaced. The disk-root refers to a polytetrafluoroethylene disk-root.

Description

Servo-actuated centering oil pumping polish rod well mouth sealing device

Rod pumping system is the main mode of production of crude oil in China, and the quality of wellhead polish rod sealing device overall performance in this system's ground installation directly influences the work quality of ground installation.The oil field pumping well mouth sealing device mainly uses fixed conventional type wellhead polish rod sealing device at present.Wellhead polish rod sealing device, scene are polished rod sealer, well head packing box or well head blowout prevention box etc. again.During installation, this polished rod sealer is installed in the top threeway of well head production tree, the packing (rubber seal) of cutting 45 ° of angles is packed in the packing box inner chamber of sealer main body top, utilize Ge Lan and seal box pressure cap to compress then, thereby make sealing ring internal circular surfaces and the obvolvent of polished rod external surface, and then the annular chamber that seal box main body and polished rod form sealed, to prevent the leakage of well head place crude oil.This device was used till today from the sixties.See from form of structure and aspect such as operation requirements etc. the conventional type wellhead sealing device have simple in structure, easy to maintenance, when operating to workman's technical requirements advantages of higher not.

This device is fixed in the threeway of well head production tree through gate base or thread connection, and the position that in a single day well head installs sealer is relative fixed also.But oil pumper since foozle, alignment error and carrying when changing deformation of members can cause polished rod axis and sealer main body axis to produce fixing and random offset, according to statistics, existence 3～10mm journal offset more than 80% of sucker rod pumping well sum.Because the conventional type wellhead polish rod sealer that is installed in the well head threeway can not tuningout, will force polished rod and well head centering, so just form a very big lateral force fulcrum at the sealed packing place, thereby make polished rod very big with sealing ring (being packing) stressed difference on circumferential fitting face in pumping, a stressed bigger side is is then worn and torn very soon, and be directed at the seal failure of whole group packing, serious even the polished rod through hole of packing pressure cap and rubber gate worn into ellipse.According to field investigation result statistics, in average about 10 days of application life of conventional well head sealed packing, MaLS is 3 wheat harvesting periods, and short life less than 24 hours.In process of production, this conventional type wellhead polish rod sealing device has exposed that seal friction power is big, sealing frequent failure, crude oil are run leakage, contaminated environment, oil recovery workman need regularly tight packing or stop well and change problems such as packing, thereby the oil well production rate is reduced greatly, influenced the crude output in oil field.

For a long time, people are always at the various novel well mouth sealing devices of design studies, to solve the problem that oil pumping polish rod axis and well head axis misalign.Show that from the data that retrieves some tuningout sealer can only be adjusted the constant offset that produces in the oil pumper installation process, but can not adjust the random offset that produces in the oil pumper motion process, and some is in fact inoperative.Domestic have only the tracking mode polished rod sealer of Jianghan Petroleum College's nineteen ninety development to have the constant offset of adjustment and random offset function, its core technology is that utilize high-pressure rubber pipe flexible realizes following the tracks of oil pumping polish rod, packing is installed in the sebific duct, thereby realized the servo-actuated centering of sealed packing and polished rod, but because high-pressure rubber pipe is a flexible element, changing packing relatively requires great effort, and the new clothes sealed packing also is difficult to compacting, in addition, make the sealer complex structure for solving the polished rod annexes such as outer sleeve that sebific duct pressurized problem designs when descending, so the sealing device fails to be extensive use of.In the external wellhead assembly, the initial stage also is to adopt fixedly conventional type well mouth sealing device, progressively adopts various deviation adjustment type well mouth sealing devices afterwards.Mainly contain two kinds of comparatively typical well mouth sealing devices in the U.S., a kind of is the spheroid deviation adjustment type, this also has multiple like product at home, in fact can not eliminate the eccentric wear between packing and the polished rod after the spheroid deflection, and just changed lateral force position of the fulcrum in the packing structure, so the effect of this kind well mouth sealing device tuningout is little.Another kind of for following the tracks of deviation adjustment type, use comparatively extensive.Its core technology is that the polished rod seal body floats and to be installed in the fixing seal box, so seal can follow the tracks of position of polished rod automatically, to reach the function of adjusting constant offset and random offset.This type well mouth sealing device exists complex structure, changes problems such as packing trouble, cost height.

The purpose of this utility model is to develop a kind of servo-actuated centering oil pumping polish rod well mouth sealing device, solves the problem that oil pumping polish rod axis and well head axis misalign, and eliminates constant offset and random offset.

The purpose of this utility model is achieved in that device is made up of three parts, comprises packing_seal device, packing box body servo-actuated centralising device and servo-actuated rubber valve system.The packing_seal device is that the polytetrafluoroethylene (PTFE) packing is packed in the packing box body, and Ge Lan is housed in the packing top and pressure cap constitutes.Screw pressure cap and apply axial compression to packing, make and produce sealing between packing and polished rod and the packing box by Ge Lan.Packing box body servo-actuated centralising device is to stretch out a flange in packing box body bottom, constitute jointly with supporter and gland, on the flange surface of packing box body, have groove or annular groove, the adjustment dish and the groove fit of a band boss are installed on the card, at the flange and the outside, adjustment dish contact position flexible thin-walled glue ring is housed, or in the flange annular groove dress O type rubber ring and teflon seal ring, with supporter that flange contact on also have annular groove, installation O type rubber ring and teflon seal ring in the groove; The packing box body is installed on the externally threaded supporter of top band, and the lower internal thread of supporter is screwed in outside the gate base body, and tapped gland is screwed in outside the supporter.Servo-actuated rubber valve system is housed below the packing_seal follower, Follow-up rubber gate is made of three compression plate, rubber ring and double-screw bolts of installing up and down, be positioned between top T shape compression plate and the middle L shaped compression plate O type rubber ring is housed, following dull and stereotyped compression plate is positioned at the gate intracavity bottom, and double-screw bolt is screwed on the gate base.

According to the packing box body portion that contacts with oil pumping polish rod in the designed well mouth sealing device of the utility model is follower structure, can with polished rod servo-actuated centering, so just solved the fixing and random offset of polished rod, eliminate horizontal fulcrum power problem, keep sealed packing only to bear axial friction, and stressed all around even, adopt the packing of new structure and material to reduce seal friction power significantly.

Describe the concrete structure of the servo-actuated centering oil pumping polish rod well mouth sealing device that proposes according to the utility model in detail below in conjunction with drawings and Examples.

Fig. 1 is the structural representation of the servo-actuated centering oil pumping polish rod well mouth sealing device of the band adjustment dish that proposes according to the utility model.

Fig. 2 is the structural representation of the servo-actuated centering oil pumping polish rod well mouth sealing device that proposes according to the utility model.

Servo-actuated centering oil pumping polish rod well mouth sealing device adopts the packing_seal oil pumping polish rod, and packing 5 is packed in the packing box body 4, and Ge Lan 3 and packing pressure cap 2 are installed in the packing top.Above part-structure design is similar to conventional formula well mouth sealing device.Shown in Figure 1 is one of embodiment according to the designed servo-actuated centering oil pumping polish rod well mouth sealing device of the utility model, is suitable for the bigger operating mode of well head pressure.Stretch out a flange in packing box body 4 bottoms, place adjustment dish 7 above the flange, adjustment is coiled 7 outsides and is inserted in the annular space between gland 9 and the packing box supporter 10.Before wellhead assembly is installed, between adjustment dish 7 inboards and packing box body 4, put into positioning sleeve 6, can make not produce between adjustment dish 7 and the packing box body 4 to relatively move.During the mounting shaft mouth sealing device, adjustment dish 7 will carry out laterally adjusting automatically in the annular space between gland 9 and the packing box supporter 10, just can finish fixedly tuningout of well head, screw the screw thread between gland 9 and the packing box supporter 10 then, adjustment this moment dish 7, gland 9 and packing box supporter 10 become one and do not have relative motion.Remove positioning sleeve 6 then, tuningout structure is at random formed with packing box body 4 in adjustment this moment dish 7 inboards.Flexible thin-walled glue ring is fastened on below the adjustment dish 7 respectively and packing box body 4 outsides in both sides about in the of 8, can realize the Follow-up seal between adjustment dish 7 and packing box body 4 sliding contact surfaces, it is excessive and damage flexible thin-walled glue ring 8 that rounded convex-concave combines the relative motion that can prevent between the two between adjustment dish 7 and the packing box body 4.Above hermetically-sealed construction advantage is can realize adjusting the constant offset of polished rod and the random offset of following the tracks of polished rod, and owing to adopted flexible thin-walled glue ring to realize Follow-up seal, between adjustment dish 7 and packing box body 4, need not the axial compression sealing, therefore when the packing box body moves laterally, only have very little side-friction, this situation is very suitable when well head pressure is big.

Be according to another embodiment of the designed servo-actuated centering oil pumping polish rod well mouth sealing device of the utility model as shown in Figure 2, be suitable for the less operating mode of well head pressure.The flange portion outside that stretch out packing box body 4 bottoms is provided with an annular groove, groove inner bottom part dress O type rubber ring 19, a teflon seal ring 18 is adorned on groove top, inboard bulge loop part on the packing box supporter 10 below packing box body 4 flanges is also processed an annular groove, O type rubber ring 21 and teflon seal ring 20 are housed in it equally, after screwing the screw thread between gland 9 and the packing box supporter 10, move laterally in the annular space of the flange portion of packing box body 4 between gland 9 and packing box supporter 10, just can with polished rod with motion tracking, to realize the fixing tuningout at random that reaches of polished rod, by

teflon seal ring

18 and 20 contact with packing box body 4 can realize the packing box body and screw gland 9 and packing box supporter 10 between Follow-up seal, the polytetrafluoroethylene (PTFE) friction factor is lower, can reduce side-friction.Compression bounce by O

type rubber ring

19 and 21 applies required sealing load to teflon seal ring, owing between the flange portion of packing box body 4 and teflon seal ring, need apply certain sealing load, well head pressure is big more, then required sealing load is just big more, this will produce bigger side-friction, so scheme 2 hour is proper in well head pressure.But this hermetically-sealed construction advantage is the constant offset and the random offset of real-time tracking polished rod, and is simple in structure, easy for installation, and reliable operation does not need flexible thin-walled glue ring to finish Follow-up seal.

The bottom of packing box body servo-actuated centralising device is a servo-actuated rubber valve system, need close servo-actuated rubber gate when changing the top packing.Gate base 17 also is the supporter of packing box body servo-actuated centralising device simultaneously, to be bound up between packing box supporter 10 and the gate base 17 by screw thread, dull and stereotyped compression plate 15 is positioned at the gate intracavity bottom, can only move axially, L type compression plate 14 is entrenched togather mutually with T type compression plate 12 and can moves axially and laterally move with polished rod, in O type rubber ring 13 is arranged, an annular groove is arranged at T type compression plate top, in adorn an O type rubber ring 11.During closed shutter, double-screw bolt 16 rotates four circles, each

compression plate

15,14 and 12 of jack-up successively, the double-screw bolt 16 that continues to rotate four circles just can compress O

type rubber ring

13 and 11, after O type rubber ring 13 is compelled to distortion, just can shut the gap between polished rod and the T type compression plate, just can realize the sealing between T type compression plate and the packing box supporter 10 after O type rubber ring 11 compresses, so just can finish closing of gate.The rubber gate is in open mode when ordinary production, and O type rubber ring 13 does not contact with polished rod 1, with avoid and polished rod between produce axial friction,

compression plate

14 and 12 can be in gate with polished rod with motion tracking.

But adopt servo-actuated centering oil pumping polish rod well mouth sealing device to substitute the conventional formula well mouth sealing device significant prolongation packing_seal life-span, reduce tight packing and replacing packing number of times, reduced labor strength, improve oil pumper productivity ratio, reduce original leakage, avoid contaminated environment, reduce the frictional force between packing and the polished rod significantly, reduce harmful power consumption, improve efficiency of the pumping unit.Estimate that this device can guarantee to reach 12～18 months application life.According to preresearch estimates, as adopt novel servo-actuated centering oil pumping polish rod sealing device, a bite well is annual cost-saved and increase the wound output value and add up to more than 4000 yuan, and more than 60,000 mouthful of bar rod-pumped well is being equipped with, wherein about 98% well mouth sealing device that oil pumper is joined or conventional type in the whole nation.As the novel well mouth sealing device of 50% employing, then a year wound benefit will reach hundred million yuan.

Claims

1. servo-actuated centering oil pumping polish rod well mouth sealing device, by the packing (5) that is contained in the packing box body (4) polished rod is sealed, it is characterized in that flanged packing box body (4) is installed in the packing_seal follower, Follow-up rubber gate is housed below the packing_seal follower.

2. servo-actuated centering oil pumping polish rod well mouth sealing device as claimed in claim 1, it is characterized in that, said packing_seal follower comprises flanged packing box body (4), supporter (10) and gland (9), on the flange card of packing box body (4), have groove or annular groove, the adjustment dish (7) and the groove fit of a band boss are installed on the card, or in annular groove, adorn O type rubber ring (19) and teflon seal ring (18); The packing box body is installed in the externally threaded supporter of top band (10), and it is external that the lower internal thread of supporter (10) is screwed in gate base (17), and tapped gland (9) is screwed in outside the supporter.

3. servo-actuated centering oil pumping polish rod well mouth sealing device as claimed in claim 1, it is characterized in that, Follow-up rubber gate is made of three compression plate, rubber ring and double-screw bolts of installing up and down, be positioned between top two compression plates (12,14) O type rubber ring is housed, nethermost compression plate (15) is installed in the gate intracavity bottom, and double-screw bolt (16) is screwed on the gate base (17).

4. servo-actuated centering oil pumping polish rod well mouth sealing device as claimed in claim 1 or 2 is characterized in that, when the adjustment dish (7) of mounting strap boss on the packing pod flanges groove, at the flange and the outside, adjustment dish contact position flexible thin-walled glue ring (8) is housed.

5. servo-actuated centering oil pumping polish rod well mouth sealing device as claimed in claim 1 or 2, it is characterized in that, when in the packing box body flanged ring groove O type rubber ring (19) and teflon seal ring (18) being installed, the supporter that contacts with flange also has annular groove on (10), and O type rubber ring (21) and teflon seal ring (20) are installed in the groove.

6. servo-actuated centering oil pumping polish rod well mouth sealing device as claimed in claim 1 is characterized in that said packing (5) is meant the polytetrafluoroethylene (PTFE) packing.