CN107564395A - Simulated experiment well - Google Patents
Simulated experiment well Download PDFInfo
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- CN107564395A CN107564395A CN201710880058.3A CN201710880058A CN107564395A CN 107564395 A CN107564395 A CN 107564395A CN 201710880058 A CN201710880058 A CN 201710880058A CN 107564395 A CN107564395 A CN 107564395A
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Abstract
The invention discloses a kind of simulated experiment well, including pit shaft in wellhead assembly, experiment and experiment outer shaft wall, pit shaft and experiment outer shaft wall are in erectility in the experiment, shaft sleeve is in the experiment outer shaft wall in the experiment, the wellhead assembly is arranged at the top of the experiment outer shaft wall, the wellhead assembly is connected with the upper end of pit shaft in the experiment, the lower end of pit shaft is connected with the lower end of the experiment outer shaft wall by rotation-preventing mechanism in the experiment, and rotation-preventing mechanism connection can prevent that pit shaft rotates relative to the experiment outer shaft wall in the experiment.The simulated experiment well can be arranged at underground, solve existing test well construction period length investment greatly, maintain the problem of inconvenient.
Description
Technical field
The present invention relates to oil exploitation experimental test technical field, a kind of particularly simulated experiment well.
Background technology
The common method for building conventional test well is installed above using indoor construction ground 204, general during using this method
Logical test well must supporting infrastructure to ensure working environment to be indoor, as shown in figure 1, the construction conventional test well contains well
Mouth four-way 201, ground flow pipeline 202 and experimental wwll cylinder 203.If (it is installed outdoors by force to cause frequently to maintain,
Increase project operation cost, reduce service life.) this method the shortcomings that be the project construction cycle length, supporting funds are big, take
Soil is more.And limited by operating space, the maintenance of equipment and replacing parts are all extremely difficult.
The content of the invention
Build that the experiment well construction period is long, and the invention provides one kind to simulate in order to solve the problems, such as existing more than ground
Experiment well, the simulated experiment well can be arranged at underground, solve existing test well construction period length investment greatly, maintenance is not
Just the problem of.
The technical solution adopted for the present invention to solve the technical problems is：
Pit shaft and experiment outer shaft wall, pit shaft and examination in the experiment in a kind of simulated experiment well, including wellhead assembly, experiment
It is in erectility to test outer shaft wall, and in the experiment outer shaft wall, the wellhead assembly is arranged at shaft sleeve in the experiment
The top of the experiment outer shaft wall, the wellhead assembly are connected with the upper end of pit shaft in the experiment, pit shaft in the experiment
Lower end is connected with the lower end of the experiment outer shaft wall by rotation-preventing mechanism, and rotation-preventing mechanism connection can prevent well in the experiment
Cylinder rotates relative to the experiment outer shaft wall.
The beneficial effects of the invention are as follows：
1st, well construction period, short expense was low
Pile foundation test well is installed using outdoor construction underground, it is not necessary to which supporting infrastructure, well construction period foreshorten to 7~15
My god, while its construction cost is greatly reduced.Because installed in underground, equipment dependability is high, and operating cost is low, supporting funds
It is few, save soil.
2nd, it is convenient to change experiment process
Pit shaft can need to change according to experiment in branch's number of pile foundation test well branch flow and experiment.Change experiment stream
Experimental wwll cylinder and whole flows are connected in the experiment outer shaft wall of tripping in again on ground during journey.Operating space is big, easy to operate.
In addition, rear cementing is welded in built-in fitting, has higher intensity.It can undertake at the trial most
Tensile or Compressive Loading, pit shaft need to only undertake very small load in experiment.The mesh of protection outer shaft wall closed test equipment is so reached
, extension device service life.
3rd, possesses anti-rotating function
Guide pad and guide groove are the polygonal cross-section coordinated.Their effect is when preventing from testing interior pit shaft by moment of torsion
Rotate, be a kind of anti-rotation device.Guide groove is welded on experiment outer tube after machining with its in the lump lower going-into-well.And
Guide pad is then arranged on pit shaft bottommost in experiment.The angle of guide pad and guide groove need to be aligned in tripping in experiment during pit shaft, really
Protect guide pad tripping in guide groove certain depth.
Brief description of the drawings
The Figure of description for forming the part of the application is used for providing a further understanding of the present invention, and of the invention shows
Meaning property embodiment and its illustrate be used for explain the present invention, do not form inappropriate limitation of the present invention.
Fig. 1 is the use state diagram of existing conventional test.
Fig. 2 is the schematic diagram for the simulated experiment well that the building method of pile foundation type test well of the present invention is built up.
Fig. 3 is schematic diagram when simulated experiment well of the present invention is vertical cold test well.
Fig. 4 is the schematic diagram of wellhead assembly in Fig. 3.
Fig. 5 is the schematic diagram of bearing in Fig. 3.
Fig. 6 is along A-A directions schematic cross-sectional view in Fig. 3.
Fig. 7 is schematic diagram when simulated experiment well of the present invention is vertical hot test well.
Fig. 8 is the schematic diagram of wellhead assembly in Fig. 7.
1st, hollow stem；2nd, gland；3rd, seal；4th, spacer ring；5th, hollow cylinder；6th, wellhead tee joint；7th, upper flange；8th, laxative remedy
It is blue；9th, experiment thimble；10th, guide pad；11st, guide groove；12nd, branch's flow pipe；13rd, outer tube；14th, bearing；15th, key；16th, push up
Flange；17th, interior wellbore section；18th, bottom flange；19th, pretension disk；20th, friction top；21st, the first bolt hole；22nd, the second bolt leads to
Hole；23rd, wedge shape sealing ring；24th, packing ring；25th, pressure ring；26th, well head built-in fitting；27th, pretension bolt；28th, high temperature seal；
71st, radial direction duct；
141st, apical ring；142nd, vertical tube；143rd, bottom plate；144th, first annular groove；145th, the second annular groove；
201st, well head four-way；202nd, ground flow pipeline；203rd, experimental wwll cylinder；204th, ground.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
A kind of building method of pile foundation type test well, comprises the following steps：
Step 1, by rig in ground drilling；
Step 2, the rig is removed, the tripping in experiment outer shaft wall into the well being drilled, make the position for testing outer shaft wall
Put fixation；
Step 3, to it is described experiment outer shaft wall in tripping in experiment in pit shaft, the upper end of pit shaft in the experiment is hung on institute
The upper end of experiment outer shaft wall is stated, the lower end of pit shaft is connected with the lower end for testing outer shaft wall by rotation-preventing mechanism in the experiment
Connect, rotation-preventing mechanism connection can prevent that pit shaft rotates relative to the experiment outer shaft wall in the experiment；
Step 4, wellhead assembly is installed in the upper end of pit shaft in the experiment.
Below to be described in detail exemplified by the pile foundation type test well for building φ 660mm：
Step 1, make rig in place, the deep wells of 20m are drilled out according to design vertical depth 20m, cleaned 2 times after being drilled, it is ensured that well
Wall cleans；
Step 2, it is drilled after well and plays out drill string and remove the rig, outside the experiment that tripping in assembles into the well being drilled
Pit shaft, the position of the experiment outer shaft wall is set to fix and (use existing cement slurry cementing)；
Pit shaft in step 3, the φ 177.8mm experiment that tripping in assembles into the experiment outer shaft wall, makes the experiment
The upper end of interior pit shaft hangs on the upper end of the experiment outer shaft wall, the lower end of pit shaft and the experiment outer shaft wall in the experiment
Lower end is connected by rotation-preventing mechanism, and rotation-preventing mechanism connection can prevent that pit shaft is relative to the experiment outer shaft wall in the experiment
Rotate；
Step 4, wellhead assembly is installed in the upper end of pit shaft in the experiment, such as installs wellhead tee joint, well head adpting flange
With ground flow pipeline, as shown in Figure 2.
Between step 1, in addition to the step of determination drilling well position, well is such as determined using hand-held GPS or total powerstation
Position (A511.70, B565.98) and unwrapping wire；
In step 1, the rig be major diameter pile foundation rig, a diameter of 660mm of the well of drilling well, the well of drilling well
The depth of eye is 20m；
Before step 2, according to the prefabricated experiment outer shaft wall φ 660mm × 20000mm of experiment demand and internal and external anti-corrosive is carried out；
Material is 20G, thickness 30mm；Corrosion resistant coating welds bottom plate, well head built-in fitting 26 and the guide groove 11 of experiment outer shaft wall, weldering after parching
Mouth 100% is detected a flaw；
In step 2, after outer shaft wall is tested described in the tripping in into the well being drilled, the position of the experiment outer shaft wall is made
Before fixation, in addition to the position of the repetition measurement well and the step of measure the perpendicularity of the well, such as repetition measurement well coordinate after solidifying
(A511.70, B565.98), and measure perpendicularity (<1/300)；Index is in error range.
The simulated experiment well built up using the building method of pile foundation type test well of the present invention is as shown in Figure 3 and Figure 7.
I.e. described simulated experiment well can be vertical cold test well, as described in example 1 below.Or the simulated experiment well
Can be vertical hot test well, as described in example below 2.
Embodiment 1
In the present embodiment, the simulated experiment well can be vertical cold test well, and suitable use temperature range is
25 DEG C~120 DEG C.The experiment outer shaft wall contains the bearing 14 and outer tube 13 being vertically connected with, the external diameter and well of outer tube 13
Diameter match, the external diameter of outer tube 13 is 660mm, and the depth of outer tube 13 is 20m, and the upper end of outer tube 13 is externally provided with well
Mouth built-in fitting 26, outer tube 13 are the tubular column structure of upper end open lower closing, and bearing 14 is the open tubular of upper and lower ends
Structure, in step 3, the upper end of pit shaft hangs on the upper end of bearing 14 in the experiment, as shown in Figures 3 to 6.
In the present embodiment, bearing 14 is located at ground more than 104, and bearing 14 is tubular structure, bearing 14 contain on to
Under the apical ring 141, vertical tube 142 and the bottom plate 143 that set gradually, the upper end of pit shaft hangs on the upper end of apical ring 141 in the experiment
Interior, the upper end of apical ring 141, which is provided with, is used for the first annular groove 144 that the upper end of pit shaft in the experiment is inserted, in the experiment
The upper end of pit shaft is connected with apical ring 141 by key 15, key 15 can prevent in the experiment pit shaft and the experiment outer shaft wall it
Between rotation, the lower surface of first annular groove 144 is provided with the second annular groove 145.After installation, pit shaft in the experiment
Upper end and wellhead assembly between the end of connecting bolt be inserted into the second annular groove 145, the center line of vertical tube 142 with
The center line of pit shaft overlaps in the experiment, as shown in Figure 5.
In the present embodiment, pit shaft contains the top flange 16 set gradually from the top down, interior wellbore section 17 in the experiment
With bottom flange 18, the center line of interior wellbore section 17 and the centerline parallel of outer tube 13, the center line of interior wellbore section 17 deviate outside
The center line of sleeve pipe 13, top flange 16 hang on the upper end of bearing 14, and bottom flange 18 passes through the rotation-preventing mechanism and the experiment
The lower end connection of outer shaft wall.It is preferred that it is provided with multiple interior wellbore sections 17, multiple interior wellbore sections 17 between top flange 16 and bottom flange 18
Vertically it is arranged in order, interior wellbore section 17 contains the experiment thimble 9 and upper flange 7 being vertically connected with, all interior wellbore sections 17
The center line of experiment thimble 9 overlap, be tightly connected between adjacent two interior wellbore sections 17 by lower flange 8, topmost
The experiment thimble 9 of interior wellbore section 17 be connected with top flange 16, the upper flange 7 of the interior wellbore section 17 of bottom and bottom flange
18 are connected, as shown in Figure 3.
In the present embodiment, be provided with radial direction duct 71 in the ring flange of upper flange 7, the central axis in radial direction duct 71 in
The center line of upper flange 7, the one end in radial direction duct 71 connect with the inner chamber of upper flange 7, and pit shaft also contains branch in the experiment
Flow pipe 12, branch's flow pipe 12 are vertically set, and the lower end of branch's flow pipe 12 connects with radial direction duct 71, affluent-dividing
The upper end of journey pipe 12 is located at the top of outer tube 13.Pile foundation type test well of the present invention contains multiple branch's flow pipes 12,
The lower end of branch's flow pipe 12 connects one to one with the radial direction duct 71 of upper flange 7, is parallel to each other between branch's flow pipe 12,
Stagger certain angle between two adjacent upper flanges 7, as shown in Figure 6.
In the present embodiment, the rotation-preventing mechanism contains guide pad 10 and guide groove 11, and guide groove 11 is in straight structure, is led
It is upright column structure to block 10, the bottom matching of guide pad 10 is plugged in the top of guide groove 11, guide pad 10
The section of bottom is regular polygon, and the bottom flange 18 on the top of guide pad 10 and the lower end of pit shaft in the experiment is connected,
The lower end of guide groove 11 and the lower end of outer tube 13 are connected.
In the present embodiment, the wellhead assembly contains the hollow stem 1 being arranged successively from inside to outside, hollow cylinder 5 and well head
Threeway 6, hollow stem 1 and hollow cylinder 5 are upright tubular structure, and wellhead tee joint 6 is in erectility, the top of hollow stem 1 and sky
The top of heart cylinder 5 is respectively positioned on outside the upper end of wellhead tee joint 6, and the upper end of hollow stem 1 is located at outside the upper end of hollow cylinder 5, hollow cylinder 5
Upper end is fixed with gland 2, and gland 2 is sheathed on outside hollow stem 1, and seal 3 and spacer ring are arranged between hollow stem 1 and hollow cylinder 5
4, gland 2, which can compress seal 3 and spacer ring 4, to be made to realize sealing between hollow stem 1 and hollow cylinder 5, as shown in Figure 4.
In the present embodiment, outer tube 13 uses major diameter sleeve pipe, under being drilled out when building by ground after Pile-Well in advance
Enter, play a part of protecting closed test device.Bearing 14 is used to hang pit shaft and wellhead assembly in the experiment, reduces well head
The stress of device.Test casing 9 can be changed at any time according to experiment demand.Branch's flow pipe 12 also can be according to test technology not
With being turned on or off at any time, reach and close note, close and adopt, dispense, dividing the test objective adopted.
In the present embodiment, upper flange 7, lower flange 8 are eccentric flange, according to branch's number adjustment of branch's flow pipe 12
Quantity and position of opening, it is easy to the installation of branch's flow pipe.Guide pad 10 and guide groove 11 are the polygonal cross-section coordinated.It is oriented to
Groove 11 is welded on experiment outer tube 13 after machining with its in the lump lower going-into-well.And guide pad 10 is then arranged on well in experiment
Cylinder bottommost.The angle of guide pad 10 and guide groove 11 need to be aligned in tripping in experiment during pit shaft, it is ensured that the tripping in of guide pad 10 is oriented to
The certain depth of groove 11.Their effect is to prevent from rotating when testing interior pit shaft by moment of torsion, is a kind of anti-rotation device.
In the present embodiment, key 15 is arranged between top flange 16 and bearing 14, also for preventing pit shaft by moment of torsion
When rotate, there is certain anti-rotation effect.The bottom joint test tubing string of hollow stem 1.Hollow cylinder 5 is machined with groove up and down
For installing seal 3.Seal 3 can be installed multigroup, and between which is separated with spacer ring 4 and prevents from influencing each other.Seal 3 is pacified
Compressed after the completion of dress with gland 2, prevent seepage.Except the seal inside sealing drum, between sealing drum and wellhead tee joint, pit shaft
Seal is also equipped between flange.Due to the sealing function of these seals, test string is carrying out put-on and delegated, rotation
Leakage will not be produced Deng when acting.
Embodiment 2
In the present embodiment, the simulated experiment well can be vertical hot test well, and suitable use temperature range is
25 DEG C~350 DEG C.The wellhead assembly contains the hollow cylinder 5 and wellhead tee joint 6 being arranged successively from inside to outside, hollow cylinder 5 and well
Mouth threeway 6 is in erectility, and pretension disk 19, friction top 20 and sealing ring, friction top are arranged with successively from the top down outside hollow cylinder 5
20 and the sealing ring be respectively positioned between hollow cylinder 5 and wellhead tee joint 6, friction top 20, which can compress the sealing ring, makes hollow cylinder
Sealing is realized between 5 and wellhead tee joint 6.
In the present embodiment, the upper end of friction top 20 and pretension disk 19 are respectively positioned on the top outside wellhead tee joint 6, friction top 20
It can be moved up and down relative to hollow cylinder 5, pretension disk 19 is threadedly coupled with hollow cylinder 5, along the circumference of pretension disk 19, pretension disk 19
Edge be provided with multiple first bolt holes 21, the center line of the first bolt hole 21 is vertically set, along friction top 20
Circumference, the upper end of friction top 20 is provided with multiple second bolt holes 22, center line and the hollow cylinder 5 of the second bolt hole 22
Center line is intersecting and vertical, and pretension bolt 27, the sealing ring are plugged with the first bolt hole 21 and the second bolt hole 22
For wedge shape sealing ring 23, packing ring 24 is provided between friction top 20 and pretension disk 19, is set between friction top 20 and wedge shape sealing ring 23
There is pressure ring 25.By screwing the pretension bolt 27 in the first bolt hole 21 and the second bolt hole 22, can be fixed and clamped lid
20 position, friction top 20 is compressed wedge shape sealing ring 23, realize the sealing effectiveness between hollow cylinder 5 and wellhead tee joint 6.
In the present embodiment, hollow cylinder 1 is hollow structure, and the lower end of hollow cylinder 5 is also associated with insertion pipe, hollow cylinder 5
Center line overlaps with the center line of the insertion pipe.Pretension bolt 27 is arranged on pretension disk 19 and pretightning force can be passed through to compression
Lid 20 is delivered on high temperature seal.High temperature seal is made up of pressure ring 25 and wedge shape sealing ring 23, wedge shape sealing ring 23
With lozenges structure.Slight deformation is produced after its stress and reaches sealing effectiveness.In addition to above-mentioned seal, vertical hot test well
Sealed at also two：When the thread seal between hollow cylinder 5 and wellhead tee joint 6, second, the upper flange 7 and lower flange of interior pit shaft
High temperature seal 28 between 8 seals.It is similar with vertical cold test well, key 15 be arranged on bearing 14 and top flange 16 between with
Reach anti-rotation effect.
In the present embodiment, pit shaft and experiment outer shaft wall part and vertical cold test in the experiment of vertical hot test well
Well is identical.That is experiment outer shaft wall is made up of experiment outer tube 13, bearing 14.Pit shaft is by top flange 16, the and of bottom flange 18 in experiment
Multiple interior wellbore sections 17 form.With vertical cold test well be a difference in that composition experiment in pit shaft and test outer shaft wall it is each
Part makes by high temperature resistant material.
Other technical characteristics in the present embodiment are same as Example 1, and in order to save length, the present embodiment is no longer detailed
Introduce.
It is described above, it is only the specific embodiment of the present invention, it is impossible to the scope implemented is invented with its restriction, so it is equivalent
The displacement of component, or the equivalent variations made according to scope of patent protection of the present invention and modification, it should all still fall within what this patent was covered
Category.In addition, between technical characteristic and technical characteristic in the present invention, between technical characteristic and technical scheme, technical scheme with
It can be used between technical scheme with independent assortment.
Claims (10)
1. a kind of simulated experiment well, it is characterised in that the simulated experiment well is outer including pit shaft in wellhead assembly, experiment and experiment
Pit shaft, pit shaft and experiment outer shaft wall be in erectility in the experiment, and shaft sleeve is located at experiment well outside in the experiment
Cylinder in, the wellhead assembly be arranged at it is described experiment outer shaft wall top, the wellhead assembly with the experiment pit shaft it is upper
End is connected, and the lower end of pit shaft is connected with the lower end of the experiment outer shaft wall by rotation-preventing mechanism in the experiment, the rotation-preventing mechanism
Connection can prevent that pit shaft rotates relative to the experiment outer shaft wall in the experiment.
2. simulated experiment well according to claim 1, it is characterised in that the experiment outer shaft wall contains the branch being vertically connected with
Seat (14) and outer tube (13), outer tube (13) are the tubular column structure of upper end open lower closing, and bearing (14) is upper and lower ends
Open tubular structure, the upper end of pit shaft hangs on the upper end of bearing (14) in the experiment.
3. simulated experiment well according to claim 2, it is characterised in that bearing (14) contains what is set gradually from the top down
Apical ring (141), vertical tube (142) and bottom plate (143), the upper end of pit shaft is hung in the upper end of apical ring (141) in the experiment, is pushed up
The upper end of ring (141), which is provided with, is used for the first annular groove (144) that the upper end of pit shaft in the experiment is inserted, well in the experiment
The upper end of cylinder is connected with apical ring (141) by key (15), and the lower surface of first annular groove (144) is provided with the second annular groove
(145)。
4. simulated experiment well according to claim 2, it is characterised in that pit shaft contains from the top down successively in the experiment
Top flange (16), interior wellbore section (17) and the bottom flange (18) of setting, center line and the outer tube (13) of interior wellbore section (17)
Centerline parallel, the center line of interior wellbore section (17) deviate the center line of outer tube (13), and top flange (16) hangs on bearing
(14) upper end, bottom flange (18) are connected by the rotation-preventing mechanism with the lower end of the experiment outer shaft wall.
5. simulated experiment well according to claim 4, it is characterised in that be provided between top flange (16) and bottom flange (18)
Multiple interior wellbore sections (17), multiple interior wellbore sections (17) are vertically arranged in order, and interior wellbore section (17), which is contained, to be vertically connected with
Experiment thimble (9) and upper flange (7), the center line of the experiment thimble (9) of all interior wellbore sections (17) overlaps, adjacent two
It is tightly connected between individual interior wellbore section (17) by lower flange (8), experiment thimble (9) and the top of the interior wellbore section (17) of the top
Flange (16) is connected, and upper flange (7) and the bottom flange (18) of the interior wellbore section (17) of bottom are connected.
6. simulated experiment well according to claim 4, it is characterised in that be provided with radial hole in the ring flange of upper flange (7)
Road (71), the central axis of radial direction duct (71) is in the center line of upper flange (7), the one end of radial direction duct (71) and upper flange
(7) inner chamber connects, and pit shaft also contains branch's flow pipe (12) in the experiment, and branch's flow pipe (12) is vertically set
Put, the lower end of branch's flow pipe (12) connects with radial direction duct (71), and the upper end of branch's flow pipe (12) is located at outer tube (13)
Top.
7. simulated experiment well according to claim 1, it is characterised in that the rotation-preventing mechanism contains guide pad (10) and is oriented to
Groove (11), guide groove (11) are in straight structure, and guide pad (10) is upright column structure, and the bottom of guide pad (10) matches
Be plugged in the top of guide groove (11), the section of the bottom of guide pad (10) is regular polygon, the top of guide pad (10)
It is connected with the lower end of pit shaft in the experiment.
8. simulated experiment well according to claim 1, it is characterised in that the wellhead assembly contains to be covered successively from inside to outside
If hollow stem (1), hollow cylinder (5) and wellhead tee joint (6), hollow stem (1) and hollow cylinder (5) are upright tubular structure, well
Mouth threeway (6) is in erectility, and the top of hollow stem (1) and the top of hollow cylinder (5) are respectively positioned on the upper end of wellhead tee joint (6)
Outside, the upper end of hollow stem (1) is located at outside the upper end of hollow cylinder (5), and the upper end of hollow cylinder (5) is fixed with gland (2), gland (2)
It is sheathed on hollow stem (1) outside, seal (3) and spacer ring (4), gland (2) energy is arranged between hollow stem (1) and hollow cylinder (5)
Enough compressing seal (3) and spacer ring (4) makes to realize sealing between hollow stem (1) and hollow cylinder (5).
9. simulated experiment well according to claim 1, it is characterised in that the wellhead assembly contains to be covered successively from inside to outside
If hollow cylinder (5) and wellhead tee joint (6), hollow cylinder (5) and wellhead tee joint (6) are in erectility, hollow cylinder (5) outside on to
Under be arranged with pretension disk (19), friction top (20) and sealing ring successively, friction top (20) and the sealing ring are respectively positioned on hollow cylinder
(5) between wellhead tee joint (6), friction top (20), which can compress the sealing ring, to be made between hollow cylinder (5) and wellhead tee joint (6)
Realize sealing.
10. simulated experiment well according to claim 9, it is characterised in that the upper end of friction top (20) and pretension disk (19)
The top of wellhead tee joint (6) outside is respectively positioned on, pretension disk (19) is threadedly coupled with hollow cylinder (5), along the circumference of pretension disk (19), in advance
The edge of tight disk (19) is provided with multiple first bolt holes (21), and the center line of the first bolt hole (21) is vertically set
Put, along the circumference of friction top (20), the upper end of friction top (20) is provided with multiple second bolt holes (22), the first bolt hole
(21) and in the second bolt hole (22) it is plugged with pretension bolt, the sealing ring is wedge shape sealing ring (23), friction top (20)
Packing ring (24) is provided between pretension disk (19), pressure ring (25) is provided between friction top (20) and wedge shape sealing ring (23).
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| CN110853475A (en) * | 2019-11-25 | 2020-02-28 | 中国海洋石油集团有限公司 | Deep sea drilling process pit shaft oil gas invasion simulation test device |
| CN113062714A (en) * | 2019-12-31 | 2021-07-02 | 中国石油天然气股份有限公司 | Medium double-circulation thermal production tool test cased well |
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| CN107564395B (en) | 2019-12-10 |
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