CN2575291Y - Drilling well plugging leaks analog experiment apparatus - Google Patents

Abstract

The utility model provides a multifunctional follow-up centering sealing device of an oil pumping wellhead. The outer side of a packing box body which is installed in a packing sealing follow-up mechanism is made into a convex flange shape, and balls are arranged between a flange disk face and a gland. One side of a press cap of a packing box is made into a tubular shape, a steel ball and a spring are arranged in the press cap of the packing box, a top cover is used for sealing, and the lower end of the press cap of the packing box is screwed on a gate base. A rubber gate is arranged below the packing sealing follow-up mechanism so that a wellhead is sealed at the time of the replacement of packings arranged at an upper part. A follow-up type rubber gate is composed of two press disks respectively arranged at an upper position and a lower position, a rubber ring, a gate cavity body, and a support body, wherein, the O-shaped rubber ring is arranged between the upper and the lower press disks, the lower press disk is installed at the bottom part of the inner cavity of the gate, the bottom part of the cavity body of the gate forms a spherical body shape, and the cavity body of the gate is installed on the base which forms a spherical body shape.

Description

Multi-functional servo-actuated centering mouth of pumped oil well sealing device

Technical field: the utility model relates to a kind of mouth of pumped oil well water-tight equipment.

Background technology: 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, therefore use the effect of spheroid deviation correcting device little separately.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.Petroleum Univ. (East China) once proposed the patent application (01233567.3 of " servo-actuated centering oil pumping polish rod well mouth sealing device " by name August 20 calendar year 2001, and get permission to authorize) on July 17th, 2002, it is that flanged packing box body is installed in the packing_seal follower, Follow-up rubber gate is housed below follower, the packing box body that oil pumping polish rod contacted like this is a follower structure, can with polished rod servo-actuated centering, the constant offset and the random offset of polished rod have been solved, eliminated horizontal fulcrum power problem, make packing only bear axial friction, and stressed all around even.Though but this device has solved the offset problem of oil pumping polish rod, the oil well blowout prevention problem after not solving that well head deflection and polished rod are disconnected and taking off.

Technology contents: the purpose of this utility model is to develop a kind of multi-functional servo-actuated centering mouth of pumped oil well sealing device, when solving the oil pumping polish rod offset problem, and the oil well blowout prevention problem after solving that well head deflection and polished rod are disconnected and taking off.

The purpose of this utility model is to realize like this.It is that servo-actuated centering oil pumping polish rod well mouth sealing device is carried out architecture advances, and whole device comprises blowout hookup, packing_seal device, packing box body servo-actuated centralising device, servo-actuated rubber valve system and well head accent ramp five parts.The packing_seal device is the packing of packing 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, constitutes jointly with supporter and gland, between the flange surface of packing box body and gland ball is installed; One side of packing pressure cap is made tubulose, and interior dress steel ball and bullet Huang seal with top cover.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 two compression plate, rubber rings of installing up and down, between last compression plate and the following compression plate O type rubber ring is housed, following compression plate is positioned at the gate intracavity bottom, the bottom of gate cavity is spheroid, is installed on the base that is spheroid equally.

The packing box body portion that contacts with oil pumping polish rod according to the designed well mouth sealing device of the utility model is a 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 it is stressed all around even, the steel ball of packing pressure cap side adds spring mechanism, oil well blowout prevention problem after can solving that polished rod is disconnected and taking off, sphere-like fit structure between base and the gate cavity, constitute wellhead assembly and transfer oblique mechanism, can solve well head deflection problem.

The specific embodiment: the concrete structure of describing the servo-actuated centering mouth of pumped oil well sealing device that proposes according to the utility model below in conjunction with drawings and Examples in detail.

Accompanying drawing is the structural representation of the multi-functional servo-actuated centering mouth of pumped oil well sealing device that proposes according to the utility model.

This pumping wellhead sealing device adopts packing_seal oil pumping polish rod 3, and packing 1 is packed in the packing box body 8, packing Ge Lan 2 and packing pressure cap 4 are installed in the top. Above part-structure design is similar to conventional formula well mouth sealing device. A flange is stretched out in packing box body 8 bottoms, places ball 10 above the flange, and gland 11 is arranged on it, consists of follow-up centering Device. Can roll between packing box body 8 and the gland 11 like this, to reduce friction. At packing box body 8 external pressures On the lid 11 over cap 9 is housed. Side at packing pressure cap 4 is designed to tubulose, in-built steel ball 5 and spring 6, With top cover 7 sealings. When oil pumping polish rod is disconnected when taking off, steel ball 5 moves on to well head in spring 6 effect bottom rails, can Effectively prevent blowout.

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 is made of last compression plate 14, O type rubber ring 13,15, following compression plate 16, gate cavity 18 and supporter 17.O type rubber ring 15 is installed in up and down between the compression plate.Another O type rubber ring 13 is installed between compression plate 14 and the supporter 17.Compression plate is installed in the gate cavity up and down, and supporter 17 is installed on outside the gate cavity 18, and supporter 17 is used to support packing box body servo-actuated centralising device.The rubber gate is in open mode when ordinary production, O type rubber ring 15 does not contact with polished rod 3, with avoid and polished rod between produce axial friction, O type rubber ring 13 does not contact with supporter 17 yet, avoiding producing frictional force, compression plate 14 and 16 can be in the gate cavity with polished rod with motion tracking.When needs are changed top packing 3, will closed shutter, can turn supporter 17 to moving down, compression plate 14 is to moving down in the compressing, and compression plate 16 is fixed down, and O type rubber ring 15 just can be shut the gap between polished rod and the compression plate after being compelled to distortion, the gap between compression plate 14 and the supporter 17 is gone up in the 13 oppressed back sealings of O type rubber ring, just can finish closing of gate.Spherical is made in the bottom of gate cavity 18, be installed in to make on the onesize spherical base 19 and constitute wellhead assembly and transfer oblique mechanism, the effect of transferring oblique mechanism is corrected the installation of well head base 19 is crooked, rather than wellhead assembly adjusted to the deflection that adapts with polished rod, studies show that as previously mentioned, use separately and transfer oblique mechanism can not eliminate packing lateral force fulcrum problem.Therefore, transfer oblique mechanism to be used just and can reach ideal effect with servo-actuated centering well mouth sealing device.

Adopt multi-functional servo-actuated centering mouth of pumped oil well sealing device to solve the constant offset and the random offset of oil pumping polish rod, the deflection that also can correct mouth of pumped oil well.But the significant prolongation packing_seal life-span reduces tight packing and replacing packing number of times, has 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.Can also under the disconnected situation of taking off of polished rod, effectively prevent oil-well blowing simultaneously.

Claims (2)

1. multi-functional servo-actuated centering mouth of pumped oil well sealing device, by the packing (1) that is contained in the packing box body (8) polished rod (3) is sealed, comprise that blowout hookup, packing box servo-actuated centralising device, rubber gate sealing device and well head transfer oblique mechanism, flanged packing box body (8) is installed in the packing_seal follower, Follow-up rubber gate is housed below the packing_seal follower, it is characterized in that, between the flange of packing box body (8) and the gland (11) ball (10) is installed; One side of packing box pressure cap (4) becomes tubulose, and interior dress steel ball (5) and spring (6) seal with top cover (7); The bottom of Follow-up rubber gate cavity (18) is sphere-like, and the base (19) that is installed in sphere-like upward constitutes well head and transfers oblique mechanism.

2. multi-functional servo-actuated centering mouth of pumped oil well sealing device as claimed in claim 1, it is characterized in that, said Follow-up rubber gate is made of two compression plate, rubber ring, gate cavity and supporters of installing up and down, between the compression plate (14,16) O type rubber ring 15 is housed up and down, between last compression plate (14) and the supporter (17) O type rubber ring (13) is housed, following compression plate (16) is installed in the gate intracavity bottom, and supporter is installed in outside the gate cavity.

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