CN203701951U - Torsion impact generator - Google Patents

Torsion impact generator Download PDF

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Publication number
CN203701951U
CN203701951U CN201420040141.1U CN201420040141U CN203701951U CN 203701951 U CN203701951 U CN 203701951U CN 201420040141 U CN201420040141 U CN 201420040141U CN 203701951 U CN203701951 U CN 203701951U
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CN
China
Prior art keywords
pulse generator
anvil block
chamber
torsional pulse
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201420040141.1U
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Chinese (zh)
Inventor
宋洵成
李同同
管志川
陆桃妹
许海超
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.)
China University of Petroleum Beijing CUPB
China University of Petroleum UPC East China
Original Assignee
China University of Petroleum UPC East China
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China University of Petroleum UPC East China filed Critical China University of Petroleum UPC East China
Priority to CN201420040141.1U priority Critical patent/CN203701951U/en
Application granted granted Critical
Publication of CN203701951U publication Critical patent/CN203701951U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a torsion impact generator which comprises a torsion impact generator body, the upper end of the torsion impact generator body is provided with a conversion connector for connecting with a drill collar, the lower end of the torsion impact generator body is provided with a drill sleeve for connecting with a drill, the torsion impact generator body comprises a shell body, a flow guide sleeve, an anvil block, a hammerhead, a positioning sleeve and a screen pipe. An anti-falling step shoulder is arranged inside the shell body, the anti-falling step shoulder is connected with the upper portion of the drill sleeve, the flow guide sleeve is located inside the shell body and is located below the conversion connector, the anvil block is located inside the shell body and is located below the flow guide sleeve, and a sealed cover is arranged between the anvil block and the flow guide sleeve. According to the torsion impact generator, structure is compact, moving parts are less, directly acting the torsion impact conversed from drilling fluid energy on the drill can be achieved, the rate of penetration is improved, meanwhile, stick-slip vibration of the drill is eliminated, and drilling stability of the drill is improved.

Description

A kind of torsional pulse generator
Technical field
The utility model belongs to oil and gas well drilling apparatus field, relates in particular to a kind of torsional pulse generator.
Background technology
At present, the trend that China's land oil-gas exploration and development presents from east to west and develops to deep-well, ultradeep well, meanwhile, offshore and gas development progressively turns to deep-sea by sea, beach with shallow sea.Along with oil-gas exploration progressively develops to territory, bottom fish deep-sea, deep, drill-well operation faces the BOTTOM LAYER ENVIRONMENT and the drilling technology difficult problem that become increasingly complex, exploration exploitation difficulty continues to increase, in the drilling process of deep-well, ultradeep well, along with the increase of well depth, formation hardness and plasticity increase, and abrasiveness strengthens, drillability variation, the vibrations of lower drilling tool stick-slip are violent.The stick-slip oscillation phenomenon of drilling tool not only causes rate of penetration to reduce, and also may cause the generation of down-hole accident, has a strong impact on the carrying out of oil-gas exploration and development.
Patent US6742609B2 discloses the turbo-driven impact structure of a kind of employing, patent CN103075097 discloses a kind of driving beater mechanism that adopts runner conversion to form high-low pressure chamber, the two all can form high-frequency torsional pulse and this impact is directly reached to drill bit, but both Shortcomings parts, the former weak point is: the wearing and tearing of the impulse member that geometry mechanism is ratchet are very fast, the pressure drop consuming is larger, the application life of having reduced whole instrument; The latter's weak point is: (1) landwaste likely enters the gap between shell spline and drill holder spline, causes tool failures; (2) spring, in falling-proof apparatus is easily out of shape or fractures in high frequency motion, makes to move in anti-lost, causes falling brill phenomenon; (3), according to disclosed structure, seal cover and flow guide sleeve are structure as a whole, and have unreasonable part, have accelerated the inefficacy of instrument; (4), throttle nozzle and screen casing be that integral type relates to, be not easy to pressure and regulate.
As can be seen here, prior art awaits further improving.
Utility model content
The utility model is the weak point of avoiding above-mentioned prior art to exist, and a kind of torsional pulse generator is provided.
The technical scheme that the utility model adopts is:
A kind of torsional pulse generator, comprise torsional pulse generator body, the upper end of described torsional pulse generator body is provided with the crossover sub for being connected with drill collar, the lower end of torsional pulse generator body is provided with the drill holder for being connected with drill bit, described torsional pulse generator body comprises housing, flow guide sleeve, anvil block, tup, positioning sleeve and screen casing, the inside of described housing is provided with anti-lost shoulder, anti-lost shoulder is connected with the top of drill holder, described flow guide sleeve is positioned at the inside of housing and is positioned at the below of above-mentioned crossover sub, described anvil block is positioned at the inside of housing and is positioned at the below of above-mentioned flow guide sleeve, between anvil block and flow guide sleeve, be provided with seal cover, described anvil block is hollow structure, anvil block inside is provided with two and impacts chamber, described screen casing is positioned at anvil block and its upper end and described flow guide sleeve and is tightly connected, the bottom of lower end and anvil block is connected, described positioning sleeve is between anvil block and screen casing and on it, bottom is connected with screen casing by the axle collar respectively, the arranged outside of described positioning sleeve has two to start chamber, inside and its upper end that described tup is positioned at anvil block are connected with described seal cover, lower end is fixed on anvil block by the axle collar, tup comprises impact tup and starts tup, described impact tup is positioned at above-mentioned impact chamber and can rotates, starting tup is positioned at startup chamber and can rotates.
On described anvil block, be distributed with four guiding gutters, wherein two guiding gutters start runner by forehand and are connected with above-mentioned startup chamber, and two other starts runner by counterattack and is connected with above-mentioned startup chamber.
Described positioning sleeve is hollow structure, is provided with and starts chamber forehand sump pit and start chamber counterattack sump pit on described positioning sleeve.
Described screen casing is cylindrical, and its middle part is evenly equipped with effluent groove, bottom is evenly equipped with outage, on described screen casing, throttle nozzle is also installed, and described throttle nozzle is between above-mentioned effluent groove and outage.
Described housing is cylindric, and the lower end of housing is evenly equipped with the housing spline of four 45 ° and the housing spline of four 45 ° corresponding with each housing spline respectively; The lower end of described drill holder is evenly equipped with the drill holder spline of four 40 ° and the drill holder spline of four 50 ° corresponding with each drill holder spline respectively, between described housing spline and drill holder spline, forms matched in clearance.
On described flow guide sleeve, be evenly equipped with multiple splitter boxs.
Described torsional pulse generator body also comprises desander, and described desander comprises above-mentioned flow guide sleeve and is arranged on the funnel in described flow guide sleeve.
The inside of described crossover sub offers water conservancy diversion through hole from top to bottom.
The arranged outside of described drill holder has protective sleeve.
The sealing that described seal cover comprises top blind flange and is connected with described top blind flange, on described top blind flange and sealing, offer the through hole that can pass through for above-mentioned screen casing top, in top blind flange, offer through hole, described sealing comprises the clamping projection suitable with above-mentioned impact chamber.
Owing to having adopted technique scheme, the obtained beneficial effect of the utility model is:
1, the utility model can convert the fluid energy that bores liquid to shaft bottom circumferential torsion, impingement mechanical rock breaking power, and drill holder structure in the present invention, can ensure that this shaft bottom mechanical rock breaking power can be delivered to drill bit in time, the stability that drill bit creeps into strengthens, in addition, in the utility model without other drilling tools such as turbine and worms, few easy workout part, the pressure drop consuming is few, long service life.
2, the anti-lost shoulder in the utility model improves the safety of creeping into, the one-piece design of seal cover and flow guide sleeve, make hydraulic structure more reasonable, improve the application life of instrument, and the one-piece design of throttle nozzle can meet in drilling process because pressure needs are changed the requirement using to nozzle.
3, compact conformation of the present utility model, moving component is few, and the torsional pulse that the fluid energy that bores liquid can be converted acts directly on drill bit, when having improved rate of penetration, has eliminated the stick-slip vibration of drill bit, has improved the stability that drill bit creeps into.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is that the A-A of Fig. 1 is to sectional view.
Fig. 3 is that the B-B of Fig. 2 is to sectional view.
Fig. 4 is the structural representation of tup in the utility model.
Fig. 5 is the structural representation of flow guide sleeve in the utility model.
Fig. 6 is the structural representation of positioning sleeve in the utility model.
Fig. 7 is the structural representation of seal cover in the utility model.
Fig. 8 is the structural representation of screen casing in the utility model.
Fig. 9 is the structural representation of anvil block in the utility model.
Figure 10 is the schematic diagram of the utility model the first duty.
Figure 11 is the schematic diagram of the utility model the second duty.
Figure 12 is the schematic diagram of the third duty of the utility model.
Figure 13 is the schematic diagram of duty in the utility model the 4th.
Figure 14 is that the C-C of Fig. 2 is to sectional view.
Wherein,
1, drill holder 2, housing 3, screen casing 4, throttle nozzle 5, the axle collar 6, positioning sleeve 7, tup 8, anvil block 9, seal cover 10, flow guide sleeve 11, funnel 12, crossover sub 13, water conservancy diversion through hole 14, desander 15, effluent groove 16, outage 17, anti-lost shoulder 18, positive shock surface 19, positioning sleeve runner 20, anti-shock surface 21, impact chamber 22, guiding gutter 23, dredging flow groove 24, forehand runner 25, impact chamber forehand sump pit 26, impact chamber counterattack sump pit 27, impact tup 28, start chamber 29, start chamber counterattack sump pit 30, counterattack starts runner 31, start tup 32, start chamber forehand sump pit 33, protective sleeve 34, splitter box 35, top blind flange 36, sealing 37, clamping projection 38, through hole 39, housing spline 40, drill holder spline
Detailed description of the invention
Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail, but the utility model is not limited to these embodiment.
As shown in Fig. 1 to Figure 14, a kind of torsional pulse generator, comprise torsional pulse generator body, the upper end of described torsional pulse generator body is provided with the crossover sub 12 for being connected with drill collar, the inside of described crossover sub 12 offers water conservancy diversion through hole 13 from top to bottom, the lower end of torsional pulse generator body is provided with the drill holder 1 for being connected with drill bit, described torsional pulse generator body comprises housing 2, flow guide sleeve 10, anvil block 8, tup 7, positioning sleeve 6 and screen casing 3, the inside of described housing 2 is provided with anti-lost shoulder 17, anti-lost shoulder 17 is connected with the top of drill holder 1, described housing 2 is cylindric, the lower end of housing 2 is evenly equipped with the housing spline of four 45 ° and the housing spline of four 45 ° corresponding with each housing spline 39 respectively, the lower end of described drill holder 1 is evenly equipped with the drill holder spline 40 of four 40 ° and the drill holder spline of four 50 ° corresponding with each drill holder spline 40 respectively, between described housing spline 39 and drill holder spline, form matched in clearance, described flow guide sleeve 10 is positioned at the inside of housing 2 and is positioned at the below of above-mentioned crossover sub 12, on described flow guide sleeve 10, be evenly equipped with multiple splitter boxs 34, described torsional pulse generator body also comprises desander 14, and described desander 14 comprises above-mentioned flow guide sleeve 10 and is arranged on the funnel 11 in flow guide sleeve 10, described anvil block 8 is positioned at the inside of housing 2 and is positioned at the below of above-mentioned flow guide sleeve 10, between anvil block 8 and flow guide sleeve 10, be provided with seal cover 9, the sealing 36 that described seal cover 9 comprises top blind flange 35 and is connected with described top blind flange 35, on described top blind flange 35 and sealing 36, offer the through hole that can pass through for above-mentioned screen casing 3 tops, in top blind flange 35, offer through hole 38, described anvil block 8 is hollow structure, anvil block 8 inside are provided with two and impact chamber 21, described sealing 36 comprises the clamping projection 37 suitable with above-mentioned impact chamber 21, described screen casing 3 is positioned at anvil block 8 and its upper end and described flow guide sleeve 10 and is tightly connected, the bottom of lower end and anvil block 8 is connected, described screen casing 3 is cylindrical, its middle part is evenly equipped with effluent groove 15, bottom is evenly equipped with outage 16, on described screen casing 3, throttle nozzle 4 is also installed, described throttle nozzle 4 is between above-mentioned effluent groove 15 and outage 16, described positioning sleeve 6 is between anvil block 8 and screen casing 3 and on it, bottom is connected with screen casing 3 by the axle collar 5 respectively, the arranged outside of described positioning sleeve 6 has two to start chamber 28, inside and its upper end that described tup 7 is positioned at anvil block 8 are connected with described seal cover 9, lower end is fixed on anvil block 8 by the axle collar 5, tup 7 comprises impact tup 27 and starts tup 31, described impact tup 27 is positioned at above-mentioned impact chamber 21 and can rotates, starting tup 31 is positioned at startup chamber 28 and can rotates, on described anvil block 8, be distributed with four guiding gutters 22, wherein two guiding gutters start runner 24 by forehand and are connected with above-mentioned startup chamber 28, two other starts runner 30 by counterattack and is connected with above-mentioned startup chamber 28, described positioning sleeve 6 is hollow structure, on described positioning sleeve 6, be provided with positioning sleeve runner 19, start chamber forehand sump pit 32 and start chamber counterattack sump pit 29, the arranged outside of described drill holder 1 has protective sleeve 33, in order to avoid entering housing 2, sandstone hinders the rotation of drill holder 1, in described impact chamber 21, be provided with positive shock surface and anti-shock surface, on described anvil block 8, be also provided with dredging flow groove 23, impact chamber forehand sump pit 25 and impact chamber counterattack sump pit 26.
Operating principle of the present utility model is: drill collar drives housing 2 to rotate, housing 2 is driven drill holder 1 and then is driven the continuous rotational shear formation rock of drill bit by housing spline 39, simultaneously, drilling fluid enters torsional pulse generator body through crossover sub, flow into directly the flow through central passage of screen casing 3 of a torsional pulse generator intrinsic drilling fluid part and flow to drill bit, a part flows into forehand by guiding gutter 22 and starts runner 24 or counterattack startup runner 30, after entering startup chamber 28, be left to dredging flow groove 23 and discharged by outage 16, another part drilling fluid is by the effluent groove 15 positioning sleeve runner of flowing through, after entering impact chamber 21, discharged by outage 16.
The course of work of the present utility model is: Figure 10 is that tup 7 forwards complete the sectional drawing that moment impact tup 27 frontal impact anvil block 8 initial times, in rotation process, positioning sleeve 6 rotates with tup 7, on the one hand impact anvil block 8 and stop when clockwise positioning sleeve 6 because effect of inertia continuation is clockwise when impacting tup 27, on the other hand, start chamber 28 and be transferred to gradually startup tup 31 opposite sides, high-pressure fluid starts runner 30 by guiding gutter 22 by counterattack, enter the startup chamber of new formation through starting chamber counterattack sump pit 29 again, accelerate the clockwise of positioning sleeve 6, fluid in startup chamber 28 is because the clockwise of positioning sleeve 6 compresses, drain into dredging flow groove 23 by starting chamber forehand sump pit 32.When clockwise the completing of cover 6 to be positioned, torsional pulse generator body enters the duty shown in Figure 11, now tup 7 and positioning sleeve 6 all cannot be clockwise, the high-pressure fluid promotion tup 7 that is entered the new startup chamber 28 forming by counterattack startup runner 30 starts to reverse, positive shock surface 18 starts to depart from anvil block 8 and form impact chamber 21, now enter and impact chamber 21 and accelerate the reverse of tup 7 by the fluid of positioning sleeve counterattack runner impact chamber forehand sump pit 25, 21, the impact chamber that the opposite side of impact tup 27 is formed by anti-shock surface 20 and anvil block 8 constantly dwindles, internal flow is discharged by impacting chamber counterattack sump pit 26, treat that tup 7 has reversed, torsional pulse generator body enters the duty shown in Figure 12, in tup 7 reversal procedures, tup 7 drives positioning sleeve 6 to rotate together, on the one hand in the time impacting tup 27 and impact anvil block 8 and stop reversing positioning sleeve 6 because effect of inertia continues reverse, on the other hand, start chamber 28 and be transferred to the opposite side that starts tup 31, high-pressure fluid starts runner 24 by guiding gutter 22 by forehand, enter startup chamber 28 through starting chamber forehand sump pit 32 again, accelerate the reverse of positioning sleeve 6, fluid in startup chamber 28 is because the reverse of positioning sleeve 6 is compressed, drain into dredging flow groove 23 by starting chamber counterattack sump pit 29.When cover 6 to be positioned has reversed, torsional pulse generator enters the duty described in Figure 13, now tup 7 and positioning sleeve 6 all cannot reverse, the high-pressure fluid promotion tup 7 that is entered startup chamber 28 by forehand startup runner 24 starts to reverse, anti-shock surface 20 starts to depart from anvil block 8 and form impact chamber 21, now enter impact chamber 21 and accelerate the clockwise of tup 7 through the fluid that impacts chamber counterattack sump pit 26 by positioning sleeve forehand runner, until tup 7 is clockwise while completing, instrument enters again the duty shown in Figure 10, like this under the driving of fluid, impacting the clockwise impact process of tup 27 can hocket with counterclockwise impact process.
The part of not addressing in the utility model adopts or uses for reference prior art and can realize.
Although more use herein such as drill holder 1, screen casing 3, the axle collar 5, crossover sub 12, water conservancy diversion through hole 13, anti-lost shoulder 17, dredging flow groove 23, impact chamber counterattack sump pit 26, start the terms such as chamber 28, protective sleeve 33, clamping projection 37, do not get rid of the possibility that uses other term.Use these terms to be only used to describe more easily and explain essence of the present utility model; They are construed to any additional restriction is all contrary with the utility model spirit.
Need to further illustrate, specific embodiment described herein is only to spiritual example explanation of the present utility model.The utility model person of ordinary skill in the field can make various amendments or supplements or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.

Claims (10)

1. a torsional pulse generator, it is characterized in that: comprise torsional pulse generator body, the upper end of described torsional pulse generator body is provided with the crossover sub for being connected with drill collar, the lower end of torsional pulse generator body is provided with the drill holder for being connected with drill bit, described torsional pulse generator body comprises housing, flow guide sleeve, anvil block, tup, positioning sleeve and screen casing, the inside of described housing is provided with anti-lost shoulder, anti-lost shoulder is connected with the top of drill holder, described flow guide sleeve is positioned at the inside of housing and is positioned at the below of above-mentioned crossover sub, described anvil block is positioned at the inside of housing and is positioned at the below of above-mentioned flow guide sleeve, between anvil block and flow guide sleeve, be provided with seal cover, described anvil block is hollow structure, anvil block inside is provided with two and impacts chamber, described screen casing is positioned at anvil block and its upper end and described flow guide sleeve and is tightly connected, the bottom of lower end and anvil block is connected, described positioning sleeve is between anvil block and screen casing and on it, bottom is connected with screen casing by the axle collar respectively, the arranged outside of described positioning sleeve has two to start chamber, inside and its upper end that described tup is positioned at anvil block are connected with described seal cover, lower end is fixed on anvil block by the axle collar, tup comprises impact tup and starts tup, described impact tup is positioned at above-mentioned impact chamber and can rotates, starting tup is positioned at startup chamber and can rotates.
2. a kind of torsional pulse generator according to claim 1, it is characterized in that: on described anvil block, be distributed with four guiding gutters, wherein two guiding gutters start runner by forehand and are connected with above-mentioned startup chamber, and two other starts runner by counterattack and is connected with above-mentioned startup chamber.
3. a kind of torsional pulse generator according to claim 1, is characterized in that: described positioning sleeve is hollow structure, is provided with and starts chamber forehand sump pit and start chamber counterattack sump pit on described positioning sleeve.
4. a kind of torsional pulse generator according to claim 1, it is characterized in that: described screen casing is cylindrical, its middle part is evenly equipped with effluent groove, bottom is evenly equipped with outage, on described screen casing, throttle nozzle is also installed, and described flow nipple is between above-mentioned effluent groove and outage.
5. a kind of torsional pulse generator according to claim 1, is characterized in that: described housing is cylindric, and the lower end of housing is evenly equipped with the housing spline of four 45 ° and the housing spline of four 45 ° corresponding with each housing spline respectively; The lower end of described drill holder is evenly equipped with the drill holder spline of four 40 ° and the drill holder spline of four 50 ° corresponding with each drill holder spline respectively, between described housing spline and drill holder spline, forms matched in clearance.
6. a kind of torsional pulse generator according to claim 1, is characterized in that: on described flow guide sleeve, be evenly equipped with multiple splitter boxs.
7. a kind of torsional pulse generator according to claim 6, is characterized in that: described torsional pulse generator body also comprises desander, and described desander comprises above-mentioned flow guide sleeve and is arranged on the funnel in described flow guide sleeve.
8. a kind of torsional pulse generator according to claim 1, is characterized in that: the inside of described crossover sub offers water conservancy diversion through hole from top to bottom.
9. a kind of torsional pulse generator according to claim 1, is characterized in that: the arranged outside of described drill holder has protective sleeve.
10. a kind of torsional pulse generator according to claim 1, it is characterized in that: the sealing that described seal cover comprises top blind flange and is connected with described top blind flange, on described top blind flange and sealing, offer the through hole that can pass through for above-mentioned screen casing top, in top blind flange, offer through hole, described sealing comprises the clamping projection suitable with above-mentioned impact chamber.
CN201420040141.1U 2014-01-22 2014-01-22 Torsion impact generator Expired - Fee Related CN203701951U (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104481396A (en) * 2014-11-14 2015-04-01 刘国经 Injection-type hydraulic dive-hole hammer of plunger valve
CN104533283A (en) * 2014-12-26 2015-04-22 长江大学 Hydraulic circumferential torque impact generator
CN105443034A (en) * 2015-12-03 2016-03-30 克拉玛依市新锋锐金刚石钻头制造有限公司 Frequency-adjustable torque force impact acceleration device
CN105840098A (en) * 2016-04-16 2016-08-10 东北石油大学 Hydraulic impactor
CN107842307A (en) * 2017-11-24 2018-03-27 中石化石油工程技术服务有限公司 A kind of drilling well torsion impact device and method
CN105178846B (en) * 2015-09-28 2018-10-16 中国石油天然气集团公司 Damping rock crushing tool
CN109555471A (en) * 2018-11-21 2019-04-02 中国石油大学(华东) A kind of rotation type torsion impact generating device and its working method
CN110295847A (en) * 2019-07-02 2019-10-01 周廷荪 Drilling well with drop preventing mechanism mentions effect device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104481396A (en) * 2014-11-14 2015-04-01 刘国经 Injection-type hydraulic dive-hole hammer of plunger valve
CN104481396B (en) * 2014-11-14 2016-06-22 刘国经 Plunger valve jet absorption type hydraulic hole drilling hammer
CN104533283A (en) * 2014-12-26 2015-04-22 长江大学 Hydraulic circumferential torque impact generator
CN105178846B (en) * 2015-09-28 2018-10-16 中国石油天然气集团公司 Damping rock crushing tool
CN105443034A (en) * 2015-12-03 2016-03-30 克拉玛依市新锋锐金刚石钻头制造有限公司 Frequency-adjustable torque force impact acceleration device
CN105840098A (en) * 2016-04-16 2016-08-10 东北石油大学 Hydraulic impactor
CN105840098B (en) * 2016-04-16 2018-02-23 东北石油大学 Hydraulic impacter
CN107842307A (en) * 2017-11-24 2018-03-27 中石化石油工程技术服务有限公司 A kind of drilling well torsion impact device and method
CN109555471A (en) * 2018-11-21 2019-04-02 中国石油大学(华东) A kind of rotation type torsion impact generating device and its working method
CN110295847A (en) * 2019-07-02 2019-10-01 周廷荪 Drilling well with drop preventing mechanism mentions effect device
CN110295847B (en) * 2019-07-02 2020-04-07 周廷荪 Well drilling effect lifting device with anti-falling mechanism

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