CN104153733A - Continuous circulating drilling system - Google Patents
Continuous circulating drilling system Download PDFInfo
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- CN104153733A CN104153733A CN201410349769.4A CN201410349769A CN104153733A CN 104153733 A CN104153733 A CN 104153733A CN 201410349769 A CN201410349769 A CN 201410349769A CN 104153733 A CN104153733 A CN 104153733A
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Abstract
The invention provides a continuous circulating drilling system. An annular pipeline is formed by starting from a circulating medium inlet and sequentially passing through a first switching valve, a main bypass valve, an auxiliary bypass valve, an auxiliary riser valve, a third switching valve and a second switching valve along the clockwise direction prior to returning to the circulating medium inlet, the pipeline between the first switching valve and the main bypass valve is connected to the pipeline between the auxiliary riser valve and the third switching valve through the main riser valve, the pipeline between the first switching valve and the main bypass valve is further connected to the pipeline between the auxiliary bypass valve and the auxiliary riser valve sequentially through a supercharging switching valve and a supercharging valve, all of the main bypass valve, the auxiliary bypass valve, the auxiliary riser valve, and the main riser valve are switching valves, and the supercharging valve is an overflow valve. By the continuous circulating drilling system, pressure stability in a main path and a bypass path in the operation process can be better guaranteed.
Description
Technical field
The present invention relates to continuous cyclic drilling technical field, in particular to a kind of Continuous Circulation Drilling System.
Background technology
In drilling operation course, when making up a joint or column and while making a trip, due to termination of pumping or turn on pump, can cause the fluctuation of down-hole pressure, thereby bring a series of borehole problems.Continuous cyclic drilling technology proposes in order to address this problem, this technology is switched drilling well circulatory mediator circulation path by Remote, continuous circulation while unloading single or column in conjunction with the continuous circulation valve realization on drill string, maintain constant drilling well circulation discharge capacity and equal yield density, while preventing from unloading single or column, stop the generation of the accident complexity such as cave-in, overflow, sand setting bit freezing that circulation causes; Simultaneously can also continually carry the formation water entering in pit shaft during gas drilling, anti-sealing gathers, soaks the borehole wall in well, avoids occurring too high injection pressure, avoids the generation of gas drilling down-hole complexity; When inflation, foam drilling, can avoid in drilling tool and annular space gas-liquid separation, guarantee to maintain constant fluid column pressure and injection pressure in pit shaft.
At present, the diverter that continuous cyclic drilling adopts both at home and abroad can be realized easy runner shunting handoff functionality, but does not consider the difference of gas and liquid.Due to the compressibility of gas, while adopting gas continuous cyclic drilling, conventional simple and easy diverter can meet the demands, but for liquid phase or air-filling well-drilling, conventional diverter exposes series of problems.As when primary path circulation time, from upstream arterial road, bypass is directly shunted, now can cause the uncontrolled bypass that enters of a large amount of fluids of arterial road, thereby cause primary path flow to reduce, fall in pressure wink seriously; Or bypass circulation time, from upstream arterial road, primary path is directly shunted, now can cause the uncontrolled primary path that enters of a large amount of fluids of arterial road, thereby cause bypass flow to reduce, fall seriously in pressure wink.These problems finally have influence on drilling well circulatory mediator equivalent circulating density, have lost the meaning of continuous circulation.
Therefore, need a kind of new Continuous Circulation Drilling System, can guarantee better the pressure stability in primary path and bypass in operation process.
Summary of the invention
Technical problem to be solved by this invention is, a kind of Continuous Circulation Drilling System that can guarantee better the pressure stability in primary path and bypass in operation process is provided,
In view of this, the invention provides a kind of Continuous Circulation Drilling System, from circulatory mediator entrance, start along clockwise direction successively by the first switch valve, bypass main valve, the secondary valve of bypass, the secondary valve of standpipe, after the 3rd switch valve and second switch valve, be back to described circulatory mediator and enter interruption-forming annulus line, on the pipeline between described bypass main valve and the secondary valve of described bypass, be provided with bypass pressure table and remove by-pass connection, on the pipeline between the secondary valve of described bypass and the secondary valve of described standpipe, be provided with relief valve and relief fittings, on the pipeline between the secondary valve of described standpipe and described the 3rd switch valve, be provided with primary path pressure meter, on the pipeline between described the 3rd switch valve and described second switch valve, be provided with stem joint, pipeline between described the first switch valve and described bypass main valve is connected to the pipeline between the secondary valve of described standpipe and described the 3rd switch valve by standpipe main valve, pipeline described in described the first switch valve and between bypass main valve is also connected to the pipeline between the secondary valve of described bypass and the secondary valve of described standpipe by supercharging switch valve and pressure charging valve successively, and the pipeline between described the first switch valve and described bypass main valve and the tie point of described standpipe main valve and described supercharging switch valve between tie point between, described bypass main valve, the secondary valve of described bypass, the secondary valve of described standpipe, described standpipe main valve is switch valve, described pressure charging valve is overflow valve.
Wherein, all switch valves all can adopt flap type; Described the first switch valve, described second switch valve and described the 3rd switch valve all can adopt hand-operated valve; Described bypass main valve, the secondary valve of bypass, the secondary valve of standpipe, described standpipe main valve, described pressure charging valve and described supercharging switch valve all can adopt hydraulic valve.
When described bypass main valve, the secondary valve of bypass, the secondary valve of standpipe, described standpipe main valve, described pressure charging valve and described supercharging switch valve all can adopt hydraulic valve, described Continuous Circulation Drilling System also comprises hydraulic control box and is connected to the operation bench of described hydraulic control box, described hydraulic control box is connected to each hydraulic valve and described primary path pressure meter, described bypass pressure meter, for controlling each hydraulic valve.
Further, described Continuous Circulation Drilling System also comprises continuous circulation valve, described in described continuous circulation valve is connected to by bypass line, removes by-pass connection.
Further, described continuous circulation valve comprises body, is arranged on intrinsic ball valve and bypass valve, described ball valve is positioned at intrinsic top, comprise upper ball base, lower ball base and ball core, wherein: the top of described upper ball base is by the spelling loop mapping that embeds body, the inner side of spelling ring is provided with support set, and locate by embedding the baffle ring of spelling in encircling on the internal diameter of support set and support set top identical with upper ball base internal diameter; The outer peripheral face of described lower ball base forms an annular shoulder, and this annular shoulder is sitting on the step forming in body, in the hole of annular shoulder bottom, spring is installed; Described ball core rotates under the effect of a ball valve operated key, realizes the ON/OFF of ball valve; Described bypass valve comprises bypass valve seat, bypass valve plate and bearing pin and torsion spring assembly, and described bypass valve plate is tightly pressed on bypass valve seat under the effect of torsion spring, forms sealing between bypass valve plate and bypass valve seat.
Further, described bypass valve plate part is stretched in described bypass valve seat port, and the two forms respectively the conical surface in contact position, between two conical surfaces, forms metal sealing.
Further, on the wall at described bypass valve seat next-door neighbour bypass valve plate two ends, be formed with respectively cutting, in described cutting, rubber ring be installed, between bypass valve seat and bypass valve plate, form sealing.
Further, between described bypass valve seat and body and between described upper ball base, lower ball base and body, all form sealing.
Described continuous circulation valve has following beneficial effect:
1, the ball valve internal diameter at this continuous circulation valve center is large, is convenient to the use of inclinometer;
2, avoid the erosion of rubber seal part, in the application life of having improved bypass valve, be suitable for the continuous cyclic drilling under gas, inflation and drilling fluid drilling condition;
3. easy for installation, reliable, making up a joint or column and making a trip in process, by upper ball valve, close primary path, from the bypass of continuous circulation valve, continuously inject drilling well circulatory mediator, can guarantee the stable of equivalent circulating density, the down hole problem of having avoided bottom hole pressure surge to cause, thus shortened drilling period, reduced drilling cost.
The present invention has following beneficial effect: install easy for installation, reliable; No matter adopt which kind of drilling well circulatory mediator, all can automatic or manual control filling supercharging path, after pressure and another peripheral passage balance, close filling supercharging path and open master/bypass, guarantee that injection pressure realizes the switching of runner stably under prerequisite; Not affecting normally creep in the situation that, can overhaul whole diverter.
Accompanying drawing explanation
Fig. 1 is according to the structural representation of the Continuous Circulation Drilling System of inventive embodiments.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.It should be noted that, in the situation that not conflicting, the application's embodiment and the feature in embodiment can combine mutually.
As shown in Figure 1, Continuous Circulation Drilling System according to an embodiment of the invention, from circulatory mediator entrance 1, start along clockwise direction successively by the first switch valve 2, bypass main valve 7, the secondary valve 14 of bypass, the secondary valve 11 of standpipe, after the 3rd switch valve 9 and second switch valve 6, be back to described circulatory mediator entrance 1 and form annulus line, on the pipeline between described bypass main valve 7 and the secondary valve 14 of described bypass, be provided with bypass pressure table 15 and remove by-pass connection 16, on the pipeline between the secondary valve 14 of described bypass and the secondary valve 11 of described standpipe, be provided with relief valve 13 and relief fittings 12, on the pipeline between the secondary valve 11 of described standpipe and described the 3rd switch valve 9, be provided with primary path pressure meter 10, on the pipeline between described the 3rd switch valve 9 and described second switch valve 6, be provided with stem joint 8, pipeline between described the first switch valve 2 and described bypass main valve 7 is connected to the pipeline between the secondary valve 11 of described standpipe and described the 3rd switch valve 9 by standpipe main valve 3, described in described the first switch valve 2 and the pipeline between bypass main valve 7 also by supercharging switch valve 4 and pressure charging valve 5, be connected to the pipeline between the secondary valve 14 of described bypass and described standpipe pair valve 11 successively, and the pipeline between described the first switch valve 2 and described bypass main valve 7 and the tie point of described standpipe main valve 3 and described supercharging switch valve 4 between tie point between, described bypass main valve 7, the secondary valve 14 of described bypass, the secondary valve 11 of described standpipe, described standpipe main valve 3 is switch valve, described pressure charging valve 5 is overflow valve.
Wherein, all switch valves all can adopt flap type; Described the first switch valve 2, described second switch valve 6 and described the 3rd switch valve 9 all can adopt hand-operated valve; Described bypass main valve 7, the secondary valve 14 of bypass, the secondary valve 11 of standpipe, described standpipe main valve 3, described pressure charging valve 5 and described supercharging switch valve 4 all can adopt hydraulic valve.
When described bypass main valve 7, the secondary valve 14 of bypass, the secondary valve 11 of standpipe, described standpipe main valve 3, described pressure charging valve 5 and described supercharging switch valve 4 all can adopt hydraulic valve, described Continuous Circulation Drilling System also comprises hydraulic control box 17 and is connected to the operation bench 18 of described hydraulic control box 17, described hydraulic control box 17 is connected to each hydraulic valve and described primary path pressure meter 10, described bypass pressure meter 15, for controlling each hydraulic valve.
Further, described Continuous Circulation Drilling System also comprises continuous circulation valve, described in described continuous circulation valve is connected to by bypass line 19, removes by-pass connection 16.
Diverter has the primary path being connected with standpipe, the bypass being connected with bypass valve, the pressure release path being connected with gas-liquid separator and filling supercharging path.Primary path is drilling fluid entrance 1, the first switch valve 2, standpipe main valve 3, the 3rd switch valve 9, removes stem joint 8; Bypass is drilling well circulatory mediator inlet attack 1, the first switch valve 2, bypass main valve 7, removes by-pass connection 16, bypass line 19; Pressure release path is divided into two kinds, to primary path pressure release, is the secondary valve 11 of standpipe, relief valve 13 and relief fittings 12, to bypass pressure release, is the secondary valve 14 of bypass, relief valve 13 and relief fittings 12; Filling supercharging path is divided into two kinds, to primary path filling supercharging, is the secondary valve 11 of supercharging switch valve 4, pressure charging valve 5 and standpipe, to bypass filling supercharging, is the secondary valve 14 of supercharging switch valve 4, pressure charging valve 5 and bypass.
Further, described continuous circulation valve comprises body, is arranged on intrinsic ball valve and bypass valve, described ball valve is positioned at the top of body 22, comprise upper ball base 27, lower ball base 30 and ball core 28, wherein: the top of described upper ball base 27 is by spelling ring 24 location that embed body 22, the inner side of spelling ring 24 is provided with support set 25, and locate by embedding the baffle ring 23 of spelling in ring 24 on the internal diameter of support set 25 and support set 25 tops identical with upper ball base 27 internal diameters; The outer peripheral face of described lower ball base 30 forms an annular shoulder, and this annular shoulder is sitting on the step of body 22 interior formation, and spring 31 is installed in the hole of annular shoulder bottom; Described ball core 28 rotates under the effect of a ball valve operated key 29, realizes the ON/OFF of ball valve; Described bypass valve comprises bypass valve seat 34, bypass valve plate 36 and bearing pin and torsion spring assembly 35, and described bypass valve plate 36 is tightly pressed on bypass valve seat 34 under the effect of torsion spring, forms sealing between bypass valve plate 36 and bypass valve seat 34.
Further, described bypass valve plate 36 parts are stretched in described bypass valve seat 34 ports, and the two forms respectively the conical surface in contact position, between two conical surfaces, form metal sealing.
Further, on the wall at described bypass valve seat 34 next-door neighbour bypass valve plate 36 two ends, be formed with respectively cutting, rubber ring 37 is installed in described cutting, between bypass valve seat 34 and bypass valve plate 36, form sealing.
Further, between described bypass valve seat 34 and body 22 and between described upper ball base 27, lower ball base 30 and body 22, all form sealing.
Continuous circulation valve upper end is connected with drilling rod by drilling rod box 21, and lower end is connected with drilling rod by drilling rod pin thread 38.Continuous circulation valve top is provided with ball valve, and bottom one side is provided with bypass valve.By rotary ball valve operated key 19, make 18 rotations of ball core, realize the ON/OFF of ball valve, reach the object of primary path on/off.
Between the body 22 of upper ball base 27 and continuous circulation valve, sealing ring 26 is housed, upper ball base 27 tops, by spelling ring 24 location that embed body 22, are spelled ring 24 inner sides and are provided with support set 25, and support set 25 upper ends are by embedding baffle ring 23 location of spelling in ring 24.Between lower ball base 30 and body 22, lower seal 32 is housed, is provided with spring 31 in the shoulder of lower ball base 30, spring 31 is sitting on the step in body 22.
Described bypass valve by by bypass sealing ring 33, with body 22 between form sealing bypass valve seat 34 and the bypass valve plate 36 being connected with bypass valve seat 34 by bearing pin and torsion spring assembly 35 form.Bypass valve plate 36 parts are stretched in described bypass valve seat 34 ports, and bypass valve seat 34 is the conical surface with the contact surface of bypass valve plate 36, and position corresponding with the conical surface on bypass valve plate 36 forms the conical surface, between two conical surfaces, forms metal sealing.
On the wall at bypass valve seat 34 next-door neighbour bypass valve plate 36 two ends, be formed with respectively cutting, rubber ring 37 is installed in cutting, what on bypass valve plate 36, contact with rubber ring 37 is plane, seals between the two by rubber ring 37.Bypass valve plate 36 is tightly pressed on bypass valve seat 34 under the effect of torsion spring, by the dual structure realization sealing of metal conical surface seal and seal with elastometic washer.In addition, bypass valve plate 36, under the external pressure effect that overcomes torsion spring pressure, can be opened to the inner side of body 22 around bearing pin, realizes the unlatching of bypass.
In addition, between bypass valve seat 34 and body 22 and between described upper ball base 27, lower ball base 30 and body 22, by sealing ring 33,26,32, seal respectively.
Described continuous circulation valve has following beneficial effect:
1, the ball valve internal diameter at this continuous circulation valve center is large, is convenient to the use of inclinometer;
2, avoid the erosion of rubber seal part, in the application life of having improved bypass valve, be suitable for the continuous cyclic drilling under gas, inflation and drilling fluid drilling condition;
3. easy for installation, reliable, making up a joint or column and making a trip in process, by upper ball valve, close primary path, from the bypass of continuous circulation valve, continuously inject drilling well circulatory mediator, can guarantee the stable of equivalent circulating density, the down hole problem of having avoided bottom hole pressure surge to cause, thus shortened drilling period, reduced drilling cost.
Described continuous circulation valve operating principle is as follows:
In normally creeping into, continuous circulation valve upper ball valve is in open mode.The bypass valve plate 36 of bypass valve is tightly pressed on bypass valve seat 34 under the effect of bearing pin and torsion spring 35 and drill string internal pressure, because both have the double sealing structure of metal conical surface seal and rubber seal, so improved sealing effectiveness.
Bypass valve plate 36 rotates around bearing pin 35 under the external pressure effect that overcomes torsion spring and drill string internal pressure, to a side in drill string, opens, and sets up bypass circulation; Rotary ball valve operated key 29 is closed ball valve simultaneously, closes circulation primary path.
After newly drill string and continuous circulation valve connect, new drill string is carried out to filling and suppress, then rotary ball valve operated key cover 29 is opened ball valve, sets up circulation primary path.Finally, reduce the injection pressure of bypass, bypass valve plate 36 rotates around bearing pin under torsion spring and the effect of drill string internal pressure, contact with bypass valve seat 34, rely on the double sealing structure of metal conical surface seal and rubber seal, realize closing of bypass valve, close bypass.
By this continuous circulation valve, can realize the continuous cyclic drilling under different drilling well circulatory mediator conditions, a series of borehole problems of having avoided the fluctuation of equivalent circulating density to cause, thus reach the object that shortens drilling period, effectively reduces drilling cost.
Continuous Circulation Drilling System in the present invention, can realize the continuous cyclic drilling operation under the different drilling well circulatory mediator conditions such as gas, inflation, foam, drilling fluid.It can make up a joint or column and the process that makes a trip in guarantee the continuously injection of drilling well circulatory mediator, guarantee the stable of equivalent circulating density, realized make up a joint or column and the process that makes a trip in the steady switching of pressure, the borehole problems of having avoided bottom hole pressure surge to cause, thus reach the object that shortens drilling period, reduces drilling cost.
As shown in Figure 1, continuous circulation drilling device, circulatory mediator entrance 1 with borehole pump or/and gas-booster be connected; Go stem joint 8 to be connected with standpipe; Relief fittings 12 is connected with gas-liquid separator; Go by-pass connection 16 to be connected with bypass valve by bypass line 19; Console 18 carrys out the switch of each hydraulic operated valve of remote control by hydraulic control box 17.
The specific works principle of the Continuous Circulation Drilling System in the present invention is as follows:
In the time of need to adopting continuous cyclic drilling, open the first switch valve 2, standpipe main valve 3 and the 3rd switch valve 9, then close second switch valve 6, enter continuous cyclic drilling flow process.Now the ball valve on continuous circulation valve is in opening, and drilling medium enters in drill string by primary path.
When needs make up a joint or column and while making a trip, bypass line 19 is connected with the bypass valve of well head.Open the secondary valve 14 of bypass and supercharging switch valve 4, when selecting automatic filling boost mode on console, and primary path pressure oscillation bound is set, the interior control section of hydraulic control box 17 will regulate the aperture of pressure charging valve 5 automatically, realizes the filling supercharging to bypass; When selecting manual filling boost mode on console, just can Remote hydraulic control box 17 apertures that regulate pressure charging valves 5, realize the filling supercharging to bypass.After bypass pressure is identical with primary path pressure, close the filling supercharging path to bypass.Open bypass main valve 7, bypass valve plate 36 around bearing pin 35 Unscrews, is realized the circulation of bypass under pressure.Close standpipe main valve 3 and ball valve operated key 29 and primary path is carried out to pressure release, closing primary path pressure release path.
Unloaded after single or column, open the secondary valve 11 of standpipe and supercharging switch valve 4, when selecting automatic filling boost mode on console, and bypass pressure oscillation bound is set, the interior control section of hydraulic control box 17 will regulate the aperture of pressure charging valve 5 automatically, realizes the filling supercharging to primary path; When selecting manual filling boost mode on console, just can Remote hydraulic control box 17 apertures that regulate pressure charging valves 5, realize the filling supercharging to primary path.After primary path pressure is identical with bypass pressure, close the filling supercharging path to primary path.Open supervisor's main valve 3 and ball valve operated key 29 and realize the circulation of primary path.Close bypass main valve 7 and bypass is carried out to pressure release, bypass valve plate 36 is closed under the effect of bearing pin and torsion spring 35, finally dismantles being connected of bypass line 19 and bypass valve, closes bypass pressure release path.
Continuous circulation round trip process is identical with said process principle, repeats no more.
By using described Continuous Circulation Drilling System, realized the continuous cyclic drilling under different drilling well circulatory mediator conditions, and when runner switches, pressure smooth transition, a series of borehole problems of having avoided the fluctuation of equivalent circulating density to cause, thus reach the object that shortens drilling period, effectively reduces drilling cost.
The present invention has following beneficial effect: install easy for installation, reliable; No matter adopt which kind of drilling well circulatory mediator, all can automatic or manual control filling supercharging path, after pressure and another peripheral passage balance, close filling supercharging path and open master/bypass, guarantee that injection pressure realizes the switching of runner stably under prerequisite; Not affecting normally creep in the situation that, can overhaul whole diverter.
In sum, content of the present invention is not limited in the above-described embodiment, and those skilled in the art can propose other embodiment within technological guidance's thought of the present invention, but this embodiment comprises within the scope of the present invention.
Claims (10)
1. a Continuous Circulation Drilling System, it is characterized in that, from circulatory mediator entrance (1), start along clockwise direction successively by the first switch valve (2), bypass main valve (7), the secondary valve (14) of bypass, the secondary valve (11) of standpipe, after the 3rd switch valve (9) and second switch valve (6), be back to described circulatory mediator entrance (1) and form annulus line, on the pipeline between described bypass main valve (7) and the secondary valve of described bypass (14), be provided with bypass pressure table (15) and remove by-pass connection (16), on the pipeline between the secondary valve (14) of described bypass and the secondary valve of described standpipe (11), be provided with relief valve (13) and relief fittings (12), on the pipeline between the secondary valve (11) of described standpipe and described the 3rd switch valve (9), be provided with primary path pressure meter (10), on the pipeline between described the 3rd switch valve (9) and described second switch valve (6), be provided with stem joint (8), pipeline between described the first switch valve (2) and described bypass main valve (7) is connected to the pipeline between the secondary valve (11) of described standpipe and described the 3rd switch valve (9) by standpipe main valve (3), pipeline described in described the first switch valve (2) and between bypass main valve (7) is also connected to the pipeline between the secondary valve (14) of described bypass and the secondary valve of described standpipe (11) by supercharging switch valve (4) and pressure charging valve (5) successively, and the pipeline between described the first switch valve (2) and described bypass main valve (7) and the tie point of described standpipe main valve (3) is positioned at and described supercharging switch valve (4) between tie point between, described bypass main valve (7), the secondary valve (14) of described bypass, the secondary valve (11) of described standpipe, described standpipe main valve (3) is switch valve, described pressure charging valve (5) is overflow valve.
2. Continuous Circulation Drilling System according to claim 1, is characterized in that, all switch valves are flap type.
3. Continuous Circulation Drilling System according to claim 1, is characterized in that, described the first switch valve (2), described second switch valve (6) and described the 3rd switch valve (9) are hand-operated valve.
4. according to the Continuous Circulation Drilling System described in any one in claims 1 to 3, it is characterized in that, described bypass main valve (7), the secondary valve (14) of bypass, the secondary valve (11) of standpipe, described standpipe main valve (3), described pressure charging valve (5) and described supercharging switch valve (4) are hydraulic valve.
5. Continuous Circulation Drilling System according to claim 4, it is characterized in that, also comprise hydraulic control box (17) and be connected to the operation bench (18) of described hydraulic control box (17), described hydraulic control box (17) is connected to each hydraulic valve and described primary path pressure meter (10), described bypass pressure meter (15), for controlling each hydraulic valve.
6. Continuous Circulation Drilling System according to claim 4, is characterized in that, also comprises continuous circulation valve, described in described continuous circulation valve is connected to by bypass line (19), removes by-pass connection (16).
7. Continuous Circulation Drilling System according to claim 6, it is characterized in that, described continuous circulation valve comprises body, is arranged on intrinsic ball valve and bypass valve, described ball valve is positioned at the top of body (22), comprise upper ball base (27), lower ball base (30) and ball core (28), wherein:
The top of described upper ball base (27) is by spelling ring (24) location that embeds body (22), the inner side of spelling ring (24) is provided with support set (25), and locate by embedding the baffle ring (23) of spelling in ring (24) on the internal diameter of support set (25) and support set (25) top identical with upper ball base (27) internal diameter; The outer peripheral face of described lower ball base (30) forms an annular shoulder, and this annular shoulder is sitting on the step forming in body (22), and spring (31) is installed in the hole of annular shoulder bottom; Described ball core (28) rotates under the effect of a ball valve operated key (29), realizes the ON/OFF of ball valve;
Described bypass valve comprises bypass valve seat (34), bypass valve plate (36) and bearing pin and torsion spring assembly (35), it is upper that described bypass valve plate (36) is tightly pressed in bypass valve seat (34) under the effect of torsion spring, forms sealing between bypass valve plate (36) and bypass valve seat (34).
8. continuous circulation valve according to claim 7, is characterized in that, described bypass valve plate (36) part is stretched in described bypass valve seat (34) port, and the two forms respectively the conical surface in contact position, between two conical surfaces, forms metal sealing.
9. continuous circulation valve according to claim 7, it is characterized in that, on the wall at described bypass valve seat (34) next-door neighbour bypass valve plate (36) two ends, be formed with respectively cutting, rubber ring (37) is installed in described cutting, between bypass valve seat (34) and bypass valve plate (36), forms sealing.
10. continuous circulation valve according to claim 7, is characterized in that, all forms sealing between described bypass valve seat (34) and body (22) and between described upper ball base (27), lower ball base (30) and body (22).
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| CN201410349769.4A CN104153733A (en) | 2014-07-22 | 2014-07-22 | Continuous circulating drilling system |
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| CN201410349769.4A CN104153733A (en) | 2014-07-22 | 2014-07-22 | Continuous circulating drilling system |
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| CN108756787A (en) * | 2018-05-25 | 2018-11-06 | 中国石油大学(华东) | Auxiliary device, Continuous Circulation Drilling System and its boring method |
| CN114622857A (en) * | 2021-07-16 | 2022-06-14 | 中国石油天然气集团有限公司 | Pressure-regulating circulating switching device and method suitable for gas continuous circulating drilling |
| CN114622851A (en) * | 2021-07-16 | 2022-06-14 | 中国石油天然气集团有限公司 | One-button continuous cycle switching device with high reliability and method thereof |
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| CN103032040A (en) * | 2012-12-21 | 2013-04-10 | 成都欧迅海洋工程装备科技有限公司 | Continuous cycle short circuit suitable for air drilling |
| CN203476262U (en) * | 2013-07-24 | 2014-03-12 | 深圳市远东石油钻采工程有限公司 | Liquid/gas dual-medium continuous cycle control system and well-drilling system |
| CN103670307A (en) * | 2013-12-09 | 2014-03-26 | 中国石油集团长城钻探工程有限公司 | Short circuit guaranteeing drilling fluid continuous circulation and drilling fluid continuous circulation process thereof |
| CN203626662U (en) * | 2013-12-28 | 2014-06-04 | 中国石油集团渤海钻探工程有限公司 | Gas-liquid dual-purpose continuous circulation drilling distribution manifold |
| CN204024543U (en) * | 2014-07-22 | 2014-12-17 | 中国石油集团渤海钻探工程有限公司 | continuous circulation drilling system |
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| CN108756787A (en) * | 2018-05-25 | 2018-11-06 | 中国石油大学(华东) | Auxiliary device, Continuous Circulation Drilling System and its boring method |
| CN108756787B (en) * | 2018-05-25 | 2020-06-19 | 中国石油大学(华东) | Auxiliary device, continuous circulation drilling system and drilling method thereof |
| CN114622857A (en) * | 2021-07-16 | 2022-06-14 | 中国石油天然气集团有限公司 | Pressure-regulating circulating switching device and method suitable for gas continuous circulating drilling |
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