CN105909205A - Novel active hydraulic control packer - Google Patents

Novel active hydraulic control packer Download PDF

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Publication number
CN105909205A
CN105909205A CN201610495456.9A CN201610495456A CN105909205A CN 105909205 A CN105909205 A CN 105909205A CN 201610495456 A CN201610495456 A CN 201610495456A CN 105909205 A CN105909205 A CN 105909205A
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CN
China
Prior art keywords
hydraulic cylinder
mandrel
hydraulic
oil circuit
action
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Granted
Application number
CN201610495456.9A
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Chinese (zh)
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CN105909205B (en
Inventor
李阁强
顾永升
王帅
郭冰菁
李跃松
赵书尚
牛彦杰
刘威
张龙飞
祖晓玲
何社阳
张福寿
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MUDANJIANG XINXIANG PETROLEUM MACHINERY Co.,Ltd.
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Henan University of Science and Technology
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Priority to CN201610495456.9A priority Critical patent/CN105909205B/en
Publication of CN105909205A publication Critical patent/CN105909205A/en
Application granted granted Critical
Publication of CN105909205B publication Critical patent/CN105909205B/en
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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/12Packers; Plugs
    • E21B33/126Packers; Plugs with fluid-pressure-operated elastic cup or skirt

Abstract

The invention discloses a novel active hydraulic control packer. A push hydraulic cylinder, an action hydraulic cylinder and a power hydraulic cylinder which are in threaded connection with one another are arranged on a core shaft in sequence; the oil supply end of an axial plunger pump communicates to a right cavity of the power hydraulic cylinder; an oil path I, an oil path II, an oil path III and an oil path IV are formed in the core shaft; electronic valves controlled by a controller to be opened and closed are respectively arranged on the four oil paths; the left cavity of the power hydraulic cylinder communicates to the left cavity of the action hydraulic cylinder through the oil path I; the right cavity of the action hydraulic cylinder communicates to the vacuum cavity of the push hydraulic cylinder through the oil path II; the left cavity of the power hydraulic cylinder communicates to the right cavity of the action hydraulic cylinder through the oil path III; the left cavity of the action hydraulic cylinder communicates to the vacuum cavity of the push hydraulic cylinder through the oil path IV. The novel active hydraulic control packer comprises a multi-cylinder combination driving module, a pump valve integration module, a core shaft oil path channel, a vacuum cavity setting and the like, so that the complexity of the packer is reduced, and the reliability of a system is improved.

Description

A kind of New Active hydraulic control packer
Technical field
The present invention relates to a kind of down-hole oil layer protection packer, concretely relate to a kind of high temperature height in petroleum production engineering Press and petroleum pipe column can be completely cut off under severe working environment payzone, the active hydraulic control packer of protection sleeve pipe.
Background technology
Packer is in the wellbore different oil reservoirs, water layer to be separated and bear the downhole tool of certain pressure reduction.It is full Foot DP technology requirement, can descend pit shaft precalculated position, and packing is tight, can have durability in down-hole again.
Due to the shortage of current oil resource, the degree of depth of oil exploitation is gradually deepened, thus causes the difficulty of exploitation to increase, The environment of exploitation is more and more severe, and so structure and performance specification to packer is more and more higher.Existing hydraulic control insulates Device there is problems in that in real work operation is loaded down with trivial details mostly, and can not recycled for multiple times, thus when having a strong impact on work Between and efficiency, increase cost;Owing to, in the fluid power system of hydraulic control packer, reliability link is many, structure is complicated, modularity Difference, causes maintenance and installation difficulty, and is difficult to ensure that the reliability worked under the deep-well environment of High Temperature High Pressure, easily cause packing Device lost efficacy in the course of the work or scrapped, thus affected packer and normally work.
Summary of the invention
It is an object of the invention to, for solving that structure present in existing hydraulic control packer is complicated, modularity is poor, can not The problem such as repeatedly recycle, it is proposed that a kind of New Active hydraulic control packer, drive module, pump valve integrated including multi-cylinder combination Module, mandrel asphalt channel and vacuum chamber are arranged, thus reduce the complexity of packer, improve the reliable of system Property.
For achieving the above object, the technical solution adopted in the present invention is: a kind of New Active hydraulic control packer, including: The mandrel being fixedly installed, mandrel is arranged with top connection and lower contact, top connection one end and lower contact one end be in close contact and on The outside of joint and lower contact is threaded by liner ring, and the inner side of top connection and lower contact is by balancing sleeve and mandrel spiral shell Stricture of vagina connects;Being additionally provided with contiguous block on mandrel, threadeds with the other end of lower contact in one end of contiguous block;
Also be sequentially arranged promotion hydraulic cylinder, action hydraulic cylinder and power hydraulic cylinder on described mandrel, above-mentioned three and mandrel it Between be matched in clearance, described power hydraulic cylinder one end and action hydraulic cylinder one end, and the other end of action hydraulic cylinder with push away One end of hydrodynamic cylinder pressure all uses double thread to connect;Also it is arranged with briquetting on mandrel, promotes the other end of hydraulic cylinder to adopt with briquetting Connect by double thread, between contiguous block and briquetting, be provided with packing element;
Being provided with floating piston in the cylinder barrel of described power hydraulic cylinder, the power hydraulic cylinder other end connects has protective cover, in protective cover Being provided with hydraulic manifold block, hydraulic manifold block is all threadeded with protective cover with mandrel and hydraulic manifold block, on hydraulic manifold block It is equiped with motor, decelerator, axial plunger pump and electromagnetic valve;
The fuel feeding end of described axial plunger pump passes sequentially through the oil circuit on hydraulic manifold block and the oil communication being opened on mandrel To the right chamber of power hydraulic cylinder, described mandrel offers oil circuit I, oil circuit II, oil circuit III and oil circuit IV, oil circuit I, oil circuit II, It is respectively arranged with on oil circuit III and oil circuit IV and is controlled its electromagnetic valve b opened and closed, electromagnetic valve c, electromagnetic valve d, electromagnetic valve by controller A, mandrel is provided with for the electromagnetism plug of above-mentioned solenoid valve and power interface, and oil circuit is passed through in the left chamber of power hydraulic cylinder I is communicated to the left chamber of action hydraulic cylinder, and the right chamber of action hydraulic cylinder is communicated to promote hydraulic cylinder vacuum chamber, dynamicliquid pressure by oil circuit II The left chamber of cylinder is communicated to the right chamber of action hydraulic cylinder by oil circuit III, and the left chamber of action hydraulic cylinder is communicated to promote hydraulic cylinder by oil circuit IV Vacuum chamber;
When opening electromagnetic valve b and electromagnetic valve c and simultaneously closing off electromagnetic valve a and electromagnetic valve d, floating piston and each liquid Cylinder pressure cylinder barrel moves simultaneously in the same direction, and under the same time, the displacement of floating piston is the twice of Barrel of Hydraulic Cylinders displacement, and then power The fluid of the left intracavity of hydraulic cylinder is squeezed generation pressure, the fluid entrance left intracavity of action hydraulic cylinder, promotes hydraulic cylinder band Dynamic pressure block, completes to set to extrude packing element to left movement.
As improving further, described mandrel being also arranged with inner support, inner support is threadeded with hydraulic manifold block, Axial plunger pump is arranged on inner support.
As improving further, the inner chamber of described promotion hydraulic cylinder is vacuum chamber structure.
As improving further, between described action hydraulic cylinder and promotion hydraulic cylinder and promotion hydraulic cylinder and briquetting all Use O end face seal.
As improving further, use between described protective cover and top connection and threaded.
As improving further, described contiguous block uses with mandrel threadeds.
As improving further, described balancing sleeve uses with inner support threadeds.
As improving further, between described many group hydraulic cylinders and mandrel, and floating piston with in power hydraulic cylinder Also O is selected to seal between wall.
As improving further, O between described axial plunger pump and inner support, is used to carry out end face seal.
Compared with prior art, the invention have the benefit that
1. the present invention is that multi-cylinder combination drives, this kind of design have machining convenience, low cost of manufacture, be easy to maintenance with And the repeatedly advantage such as recycling;
2. it is attached by double thread between many groups hydraulic cylinder of the present invention, and selects O end face seal, thus ensure liquid Sealing property between cylinder pressure;
3. the present invention is in whole work process, promotes the load suffered by hydraulic cylinder to be eventually transferred to the company of many groups hydraulic cylinder Connecing at screw thread, the shell of many group hydraulic cylinders itself is also that final load bearing component shell afterwards serves as push rod, to play structure letter The purpose changed;
4. require compact due to packer overall structure, in order to save space, each Hydraulic Elements are installed, devise specially Hydraulic manifold block, it is simple to install and debug;
5. the design of the oil circuit on hydraulic manifold block and mandrel, makes hydraulic oil be directly entered the right intracavity of power hydraulic cylinder of packer, Promotion floating piston works, it is possible to increase the work efficiency setting and unsealing, and shortens working hours;
6. promote the structure design of hydraulic cylinder vacuum chamber, the oil return efficiency setting and unsealing can be improved.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the operation principle schematic diagram of the present invention.
Fig. 3 is the operation principle schematic diagram setting process.
Fig. 4 is the operation principle schematic diagram of deblocking process.
Labelling in figure: 1, top connection, 2, balancing sleeve, 3, liner ring, 4, lower contact, 5, contiguous block, 6, packing element, 7, pressure Block, 8, promote hydraulic cylinder, 801, promote hydraulic cylinder vacuum chamber, 9, mandrel, 10, action hydraulic cylinder, 1001, action hydraulic cylinder left Chamber, 1002, the right chamber of action hydraulic cylinder, 11, floating piston, 12, hydraulic manifold block, 13, electromagnetic valve, 14, inner support, 15, slow down Device, 16, motor, 17, electromagnetism plug, 18, power interface, 19, axial plunger pump, 20, protective cover, 21, power hydraulic cylinder, 2101, the right chamber of power hydraulic cylinder, 2102, the left chamber of power hydraulic cylinder.
Detailed description of the invention
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described in further detail.
As depicted in figs. 1 and 2, a kind of New Active hydraulic control packer, including the mandrel 9 being fixedly installed, sheathed on mandrel 9 There are top connection 1 and lower contact 4, top connection 1 one end and lower contact 4 one end to be in close contact and the outside of top connection 1 and lower contact 4 leads to Crossing liner ring 3 threaded, is threadeded with mandrel 9 by balancing sleeve 2 in the inner side of top connection 1 and lower contact 4;On mandrel 9 Being additionally provided with contiguous block 5, threadeds with the other end of lower contact 4 in one end of contiguous block 5, and contiguous block 5 and mandrel 9 use screw thread even Connect.
Also be sequentially arranged promotion hydraulic cylinder 8, action hydraulic cylinder 10 and power hydraulic cylinder 21 on mandrel 9, above-mentioned three with It is matched in clearance between mandrel 9.The present invention is formed by organizing hydraulic cylinder more, if many group cylinder design are become an entirety knot Structure, then inner loop is reduced few, it is possible to improve the reliability of design to a certain extent.But, it is contemplated that machining difficulty or ease become Degree, the factor such as manufacturing cost, therefore will organize hydraulic cylinder separate design, power hydraulic cylinder 21 one end and action hydraulic cylinder 10 1 more Hold, and the other end of action hydraulic cylinder 10 all uses double thread to be connected with the one end promoting hydraulic cylinder 8;On mandrel 9 the most sheathed There is briquetting 7, promote the other end of hydraulic cylinder 8 to use double thread to be connected with briquetting 7, between contiguous block 5 and briquetting 7, be provided with packing element 6;
O end face seal is all used between action hydraulic cylinder 10 and promotion hydraulic cylinder 8 and promotion hydraulic cylinder 8 and briquetting 7.Push away The inner chamber of hydrodynamic cylinder pressure 8 is vacuum chamber structure.
Being provided with floating piston 11 in the cylinder barrel of power hydraulic cylinder 21, power hydraulic cylinder 21 other end connects protective cover 20. Owing to packer overall structure requires compact, in order to save space, each Hydraulic Elements are installed, devise special liquid Pressure integrated package, it is simple to installing and debug, hydraulic manifold block 12 is arranged in protective cover 20, between hydraulic manifold block 12 and mandrel 9 Use threaded, hydraulic manifold block 12 is equiped with motor 16, decelerator 15, axial plunger pump 19 and electromagnetic valve 13, protection Cover 20 is connected with the threaded one end of the top connection 1 of another packer.Protective cover 20 is carried out by screw thread with hydraulic manifold block 12 Connect, play buffer action, thus ensure that electromagnetic valve and control line etc. are not disturbed by extraneous adverse circumstances.
Offering five wire-passing tubes and four oil circuits on mandrel 9, the circumference along mandrel is angularly distributed, hydraulic manifold block 12 The most corresponding with mandrel 9 devises five wire-passing tubes and four oil-outs, and what this hydraulic system was taked is monoblock type fuel tank, shell The interior hydraulic oil being full of serves the effect of fuel tank, and the hydraulic oil of axial plunger pump 19 output, by four electromagnetic valves to each oil Road is controlled.
Offering C hole on the left chamber of power hydraulic cylinder 2102, the left chamber of action hydraulic cylinder 1001 offers B hole, action hydraulic cylinder Right chamber 1002 offers F hole, promotes hydraulic cylinder vacuum chamber 801 to offer E hole, and the left chamber of power hydraulic cylinder 2102 offers G hole, pushes away Hydrodynamic cylinder pressure vacuum chamber 801 offers A hole, and the right chamber of power hydraulic cylinder 2101 offers the D hole entered for hydraulic oil.
The fuel feeding end of described axial plunger pump 19 passes sequentially through the oil circuit on hydraulic manifold block 12 and is opened on mandrel 9 Oil communication, to the right chamber of power hydraulic cylinder 2101, described mandrel 9 offers oil circuit I, oil circuit II, oil circuit III and oil circuit IV, It is respectively arranged with on oil circuit I, oil circuit II, oil circuit III and oil circuit IV and is controlled its electromagnetic valve b opened and closed, electromagnetic valve c, electricity by controller Magnet valve d, electromagnetic valve a, mandrel 9 is provided with for the electromagnetism plug 17 of above-mentioned solenoid valve and power interface 18, power The left chamber of hydraulic cylinder 2102 is communicated to the left chamber of action hydraulic cylinder 1001 by oil circuit I, and the right chamber of action hydraulic cylinder 1002 is by oil circuit II It is communicated to promote hydraulic cylinder vacuum chamber 801, the left chamber of power hydraulic cylinder 2102 to be communicated to the right chamber of action hydraulic cylinder by oil circuit III 1002, the left chamber of action hydraulic cylinder 1001 is communicated to promote hydraulic cylinder vacuum chamber 801 by oil circuit IV;
Also being arranged with inner support 14 on mandrel 9, inner support 14 is threadeded with hydraulic manifold block 12, and axial plunger pump 19 is arranged on On inner support 14, O between axial plunger pump 19 and inner support 14, is used to carry out end face seal.Balancing sleeve 2 and mandrel 9 it Between, and be all attached by screw thread between balancing sleeve 2 and inner support 14.
Its operation principle is:
After starting to set, when opening electromagnetic valve b and electromagnetic valve c and simultaneously closing off electromagnetic valve a and electromagnetic valve d, float Piston 11 and each Barrel of Hydraulic Cylinders move simultaneously in the same direction, and under the same time, the displacement of floating piston 11 is Barrel of Hydraulic Cylinders displacement Twice, i.e. the movement velocity of floating piston 11 is the twice of movement velocity of cylinder barrel, and then in the left chamber of power hydraulic cylinder 2102 Fluid be squeezed generation pressure, fluid enters in the left chamber of action hydraulic cylinder 1001, promotes hydraulic cylinder 8 to drive briquetting 7 to left movement to extrude packing element 6, complete to set.The load of this forces hydraulic cylinder 8 has been eventually transferred to many groups hydraulic cylinder Connecting at screw thread, the shell of many group hydraulic cylinders itself is also that final load bearing component shell afterwards serves as push rod.
Start solution to be honored as a queen, when opening electromagnetic valve a and electromagnetic valve d and simultaneously closing off electromagnetic valve b and electromagnetic valve c, Chamber right with action hydraulic cylinder, the left chamber of power hydraulic cylinder 2,102 1002 connects and the pressure in two chambeies is equal, hydraulic oil propulsion power hydraulic pressure The right chamber of cylinder 2101 drives whole outer cylinder to unseal, and floating piston 11 displacement is approximately 0, and outer cylinder drives briquetting 7 to transport to the right Dynamic, packing element 6 restores, and completes deblocking.
Between many group hydraulic cylinders and mandrel 9, and also select O between floating piston 11 and power hydraulic cylinder 21 inwall Seal.Oil temperature in view of hydraulic oil residing for sealing ring can make rubber have certain expansion, and the change of oil temperature is except expanding system Outside number changes, the elastic mould of rubber also to change.So, the present invention selects according to after actual condition analysis Selecting, fluorubber is applicable to petrochemical industry, and oil resistant is ageing-resistant, is the optimum selection of oil packer use sealing ring.
As shown in Figure 3, it is assumed that floating piston is relative to mandrel motion x1, and power hydraulic cylinder is relative to mandrel motion x2, instrument end End final mean annual increment movement is x3, and oil pocket area is A.
When setting motion, floating piston and power hydraulic cylinder all produce motion, it is assumed that both direction of motion is all downward, and two Person is different due to movement velocity, makes fluid produce extruding and produces flow, and the flow Q of fluid is: Q=(x1-x2) * A, this part The flow squeezed out promotes outer cylinder to move downward in entering into the left chamber of action hydraulic cylinder 1001, so that Q=x3*A
Simultaneous two formula can obtain
(x1-x2)*A= x3*A
I.e. x1-x2=x3 x1=x3+x2
Because cylinder barrel is generally rigidly connected, have
x2=x3
I.e. x1=2x2=2x3
Can be obtained by above result of calculation, the displacement of piston is 2 times of outer cylinder displacement.
It is assumed that floating piston is relative to mandrel motion x1, power hydraulic cylinder is relative to mandrel motion x2, instrument end End final mean annual increment movement is x3, and oil pocket area is A.During deblocking motion, it is assumed that floating piston moves downward relative to mandrel, power hydraulic cylinder Moving upward, make fluid produce extruding and produce flow, the flow Q of fluid is: Q=(x1+x2) * A, the flow that this portion extrusion goes out Outer cylinder is driven to move upward in entering into the right chamber of action hydraulic cylinder 1002, so that
Q=x3*A
Simultaneous two formula can obtain "
(x1+x2)*A= x3*A
I.e. x1+x2=x3 x1=x3-x2
Because cylinder barrel is generally rigidly connected, have:
x2=x3
I.e. x1=0, piston relatively mandrel during deblocking is resting state, power resources on floating piston with ambient pressure The power area being connected.
Be can be seen that the displacement of piston is approximately 0 by above result of calculation, extraneous cylinder barrel motion.

Claims (9)

1. a New Active hydraulic control packer, including: the mandrel (9) being fixedly installed, mandrel (9) is arranged with top connection (1) With lower contact (4), top connection (1) one end and lower contact (4) one end are in close contact and top connection (1) and the outside of lower contact (4) Threaded by liner ring (3), the inner side of top connection (1) and lower contact (4) is by balancing sleeve (2) and mandrel (9) screw thread Connect;Being additionally provided with contiguous block (5) on mandrel (9), threadeds with the other end of lower contact (4) in one end of contiguous block (5), and it is special Levy and be:
Promotion hydraulic cylinder (8), action hydraulic cylinder (10) and power hydraulic cylinder (21) also it has been sequentially arranged on described mandrel (9), on State and between three and mandrel (9), be matched in clearance, described power hydraulic cylinder (21) one end and action hydraulic cylinder (10) one end, with And the other end of action hydraulic cylinder (10) all uses double thread to be connected with the one end promoting hydraulic cylinder (8);Mandrel (9) is upper the most sheathed There is briquetting (7), promote the other end of hydraulic cylinder (8) to use double thread to be connected, between contiguous block (5) and briquetting (7) with briquetting (7) It is provided with packing element (6);
Being provided with floating piston (11) in the cylinder barrel of described power hydraulic cylinder (21), power hydraulic cylinder (21) other end connects protection Cover (20), is provided with hydraulic manifold block (12), hydraulic manifold block (12) and mandrel (9) and hydraulic manifold block in protective cover (20) (12) all threaded with protective cover (20), hydraulic manifold block (12) is equiped with motor (16), decelerator (15), axial plunger Pump (19) and electromagnetic valve (13);
The fuel feeding end of described axial plunger pump (19) passes sequentially through the oil circuit on hydraulic manifold block (12) and is opened on mandrel (9) Oil communication to the right chamber of power hydraulic cylinder (2101), described mandrel (9) offers oil circuit I, oil circuit II, oil circuit III and oil Road IV, oil circuit I, oil circuit II, oil circuit III and oil circuit IV is respectively arranged with and is controlled, by controller, electromagnetic valve b, the electromagnetism that it opens and closes Valve c, electromagnetic valve d, electromagnetic valve a, mandrel (9) is provided with for connecing to the electromagnetism plug (17) of above-mentioned solenoid valve and power supply Mouth (18), the left chamber of power hydraulic cylinder (2102) is communicated to the left chamber of action hydraulic cylinder (1001), the right chamber of action hydraulic cylinder by oil circuit I (1002) being communicated to promote hydraulic cylinder vacuum chamber (801) by oil circuit II, the left chamber of power hydraulic cylinder (2102) is by oil circuit III even Passing to the right chamber of action hydraulic cylinder (1002), the left chamber of action hydraulic cylinder (1001) is communicated to promote hydraulic cylinder vacuum chamber by oil circuit IV (801);
When opening electromagnetic valve b and electromagnetic valve c and simultaneously closing off electromagnetic valve a and electromagnetic valve d, floating piston (11) and each Individual Barrel of Hydraulic Cylinders moves simultaneously in the same direction, the twice that displacement is Barrel of Hydraulic Cylinders displacement of floating piston (11) under the same time, And then the fluid in the left chamber of power hydraulic cylinder (2102) is squeezed generation pressure, the fluid left chamber of entrance action hydraulic cylinder (1001) In, promote hydraulic cylinder (8) to drive briquetting (7) to left movement with extruding packing element (6), complete to set.
A kind of New Active hydraulic control packer the most according to claim 1, it is characterised in that: described mandrel also overlaps on (9) Being provided with inner support (14), inner support (14) and hydraulic manifold block (12) thread connection, axial plunger pump (19) is arranged on inner support (14) on.
A kind of New Active hydraulic control packer the most according to claim 1 and 2, it is characterised in that: described promotion hydraulic cylinder (8) inner chamber is vacuum chamber structure.
A kind of New Active hydraulic control packer the most according to claim 1, it is characterised in that: described action hydraulic cylinder (10) And promote and all use O end face seal between hydraulic cylinder (8) and promotion hydraulic cylinder (8) and briquetting (7).
A kind of New Active hydraulic control packer the most according to claim 1, it is characterised in that: described protective cover (20) is with upper Use threaded between joint (1).
A kind of New Active hydraulic control packer the most according to claim 1, it is characterised in that: described contiguous block (5) and core Axle (9) uses threaded.
A kind of New Active hydraulic control packer the most according to claim 2, it is characterised in that: described balancing sleeve (2) with Inner support (14) uses threaded.
A kind of New Active hydraulic control packer the most according to claim 1, it is characterised in that: described many group hydraulic cylinders and core Between axle (9), and O is also selected to seal between floating piston (11) and power hydraulic cylinder (21) inwall.
A kind of New Active hydraulic control packer the most according to claim 1, it is characterised in that: described axial plunger pump (19) And use O to carry out end face seal between inner support (14).
CN201610495456.9A 2016-06-30 2016-06-30 A kind of New Active hydraulic control packer Active CN105909205B (en)

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Application Number Priority Date Filing Date Title
CN201610495456.9A CN105909205B (en) 2016-06-30 2016-06-30 A kind of New Active hydraulic control packer

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Application Number Priority Date Filing Date Title
CN201610495456.9A CN105909205B (en) 2016-06-30 2016-06-30 A kind of New Active hydraulic control packer

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CN105909205B CN105909205B (en) 2018-04-10

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CN113445957A (en) * 2021-09-01 2021-09-28 东营金昱技术开发有限公司 Packer capable of protecting rubber cylinder for oil field water injection well

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