CN106401514A - Backpressure valve capable of achieving automatic slurry injecting - Google Patents

Backpressure valve capable of achieving automatic slurry injecting Download PDF

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Publication number
CN106401514A
CN106401514A CN201611159813.0A CN201611159813A CN106401514A CN 106401514 A CN106401514 A CN 106401514A CN 201611159813 A CN201611159813 A CN 201611159813A CN 106401514 A CN106401514 A CN 106401514A
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China
Prior art keywords
valve
mud
valve body
base
valve base
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CN201611159813.0A
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CN106401514B (en
Inventor
陈伦俊
池振华
邹益文
卢伟
周强强
刘飞鹏
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CHENGDU ZHUOXIN INDUSTRY Co Ltd
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CHENGDU ZHUOXIN INDUSTRY Co Ltd
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Publication of CN106401514A publication Critical patent/CN106401514A/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/10Valve arrangements in drilling-fluid circulation systems

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Check Valves (AREA)

Abstract

The invention discloses a backpressure valve capable of achieving automatic slurry injecting, and belongs to the technical field of drilling equipment. The backpressure valve comprises a valve body, a valve element and a support base and a valve base which are arranged in the valve body, wherein the support base is located under the valve base. The backpressure valve is characterized in that a piston is arranged in the valve body and arranged on the valve element in a sleeving mode, the valve base comprises an upper valve base body and a lower valve base body, the upper valve base body is located between the piston and the valve body, a slurry reflux tank hole is formed in the upper valve base body and communicated with an inner cavity of the valve body, and a slurry reflux hole is formed in the valve body and communicated with the slurry reflux tank hole. According to the backpressure valve, due to the fact that slurry in a well can be automatically injected into a drill pipe and does not need to be injected into the drill pipe by connecting a slurry injection device to the drill pipe whenever a part of the drill pipe is put down, the work amount is greatly decreased, the slurry injecting cost is effectively reduced, the condition that the slurry in the well is reversely sprayed into the drill pipe through an inner cavity of the valve body is effectively prevented, and then well drilling safety is guaranteed.

Description

A kind of back pressure valve that is certainly in the milk
Technical field
The present invention relates to drilling equipment technical field, more particularly, to a kind of back pressure valve that is certainly in the milk.
Background technology
Back pressure valve is the device of spray in one of drilling process is prevented, is a kind of ball-and-seat, back pressure valve can be effective Prevent formation fluid by bit port enter drilling tool in.Existing back pressure valve mainly include valve body, fulcrum bearing, valve element and Valve seat.Its structural principle is that have a taper movable valve plug in instrument hydrophthalmia, during installation its big end down, small end upward, when Mud by hydrophthalmia from top to down when, flow resistance is less, can pass through;The from bottom to top anti-channeling flowing in drill string when mud When, the thrust that its big end is subject to is larger, and promotes taper head to move up, until the valve element conical surface is pasted with the valve seat conical surface Close, thus reaching the purpose of closure hydrophthalmia.Generally kill-job, drilling make up a joint and going down process in can play and prevent mud anti- The effect of spray.
Publication No. CN 203547660U, publication date is that the Chinese patent literature of on 04 16th, 2014 discloses one kind Back pressure valve it is characterised in that:Including valve body, Compounded rubber plug, eyelet;Described valve body is cylinder, along its axis direction It is provided with slurry channel;It is provided with annular projection, described Compounded rubber plug is placed in described annular projection on described valve body one end, will Described slurry channel closure;It is provided with annular groove, described eyelet is placed in described ring on the inwall of described slurry channel In connected in star;On described Compounded rubber plug, towards described eyelet direction, it is provided with connecting portion;Described connecting portion is placed in described In slurry channel, its free end is provided with block;When described Compounded rubber plug blocks described slurry channel, described block is worn Cross described eyelet, described eyelet can stop described block towards the direction motion of described annular projection.
Back pressure valve disclosed in this patent documentation, although good sealing and choked flow effect can be played, prevents from regurgitating, keeps away Exempt to cause engineering accident.But, the prior art with this patent documentation as representative, all there is following defect:
1st, in lower brill, often put down a part of drilling rod it is necessary to connect provisions for grouting to pour into mud into drilling rod, after having filled, then Take off provisions for grouting, put into next and save drilling rod, so repeat just to complete lower brill action, quantities is very big, wastes time and energy, need Pour into substantial amounts of mud, high cost of being in the milk.
The 2nd, spring is installed between the valve element of back pressure valve and base, spring is socketed on the valve rod of valve element, spring one end It is connected on base, the other end is connected on the circular cone of valve element, because the diameter of valve rod is less, back pressure valve is in life-time service During, valve element moves up and down, spring also can ceaselessly return and compression, spring easily deforms by excessive compression, Lead to valve element circular cone cannot fast and effectively parking position accuracy it is impossible to valve seat conical surface good fit, and then do not reach and block The purpose of hydrophthalmia;And spring is in compression and reset, spring swings, and ceaselessly clashes into the valve rod of valve element, leads to valve rod to fracture, Valve element is ineffective, leads to mud to be regurgitated, and causes extremely serious consequence.
Content of the invention
The present invention in order to overcome the defect of above-mentioned prior art, provide a kind of from the back pressure valve that is in the milk, the present invention can be by In well, mud pours in drilling rod automatically, need not often put down a part of drilling rod and just connect provisions for grouting pouring into mud, pole into drilling rod Big reduces quantities, effectively reduces grouting cost, and can effectively prevent the inner chamber through valve body for the mud in well regurgitate to In drilling rod, ensure drilling safety.
The present invention is achieved through the following technical solutions:
A kind of from the back pressure valve that is in the milk, includings valve body, valve element and be arranged on the fulcrum bearing in valve body and valve seat, fulcrum bearing is positioned at valve Seat lower section it is characterised in that:It is provided with piston, on valve element, described valve seat includes upper valve base to described piston bush in described valve body And lower valve base, upper valve base be located between piston and valve body, described upper valve base has mud backflow slotted eye, mud backflow slotted eye with The inner space of valve body, described valve body has mud return port, and described mud return port is connected with mud backflow slotted eye.
Described valve element includes upper valve rod, circular cone and lower valve rod from top to bottom successively, and the upper end of upper valve rod is provided with fixation Nut, lower end is connected with the small end of circular cone, and lower valve rod one end is connected with the big end of circular cone, and the other end stretches in fulcrum bearing.
Back-moving spring is cased with described lower valve rod, back-moving spring is contacted with fulcrum bearing.
It is provided with the first O-ring seals, the first O-ring seals are nested in circular cone between described circular cone and lower valve base On big end.
Spring groove is had on the big end of described circular cone, one end of back-moving spring is contacted with the bottom of spring groove, the other end Contact with fulcrum bearing.
Mounting groove is had on described upper valve base, mounting groove is connected with mud return port and mud backflow slotted eye respectively, installs Check valve is installed in groove.
Described check valve includes limit spring and backflow steel ball, one end of limit spring and the top contact of mounting groove, The other end is contacted with backflow steel ball, and backflow steel ball is stuck on the bottom of mounting groove.
Locating slot is had on described piston, retaining spring and locking ball is installed in locating slot, upper valve base is at least opened There are two groups of grooves being adapted with locking ball.
Step is provided with the inwall of described valve body, step is provided with pressure cap, pressure cap is located above piston, pressure cap and valve Body is threaded connection.
It is provided with the second O-ring seals, the second O-ring seals are enclosed within lower valve base between described lower valve base and valve body.
It is provided with the 3rd O-ring seals, the 3rd O-ring seals are enclosed within upper valve base between described upper valve base and valve body.
It is provided with the 4th O-ring seals, the 4th O-ring seals are enclosed within piston between described piston and upper valve base.
Opening is had on described circular cone, opening is connected with spring groove.
Described upper valve base and lower valve base are formed in one and form, and lower valve base is adapted with circular cone.
The operation principle of the present invention is as follows:
Lower brill:By drilling tool together with from grouting back pressure valve G.I.H, in well mud under the effect of the pressure, i.e. annular space pressure In the case of being higher than body cavity by force, in well, mud enters into the mud on upper valve base through the mud return port on valve body from outside to inside At slurry backflow slotted eye, overcome the elastic force of limit spring to act on and backflow steel ball is backed down upwards, mud backflash hole path is beaten Open, in well, mud enters the inner chamber of valve body along mud backflow slotted eye, mud is back to brill from bottom to top by the inner chamber of valve body In bar;With constantly descending drilling tool, in well, mud constantly flows back in drilling rod, until lower drilling tool finishes, fluid pressure inside and outside drilling rod Balance, in well mud no longer to drilling rod internal reflux, complete in drilling rod from grouting action.Instantly drilling tool finishes, and in well, mud is not Again to drilling rod internal reflux, the backflow steel ball in upper valve base moves down cut out mud backflow slotted eye under the elastic force effect of limit spring Passage, in case during postorder direct circulation mud, prevent mud from letting out through mud backflow slotted eye.
Direct circulation mud:Mud in grouting equipment on ground is squeezed into drilling rod together with mud in the well in drilling rod by slush pump Enter from the valve body being in the milk back pressure valve, mud promotes valve element to overcome the elastic force of back-moving spring, by the circular cone of valve element down Promote, make circular cone depart from lower valve base, direct circulation slurry channel is opened;Meanwhile, valve element is driven by fixing nut and lives Plug moves down, and mud backflow slotted eye is blocked by piston, makes to close from grouting channel;Mud in grouting equipment on ground and drilling rod In interior well, mud, through flowing through whole drilling tool from the back pressure valve that is in the milk, from bottom bit port out, and bores within well Annular space beyond bar flows on ground, and sandstone that thus shaft bottom can be come outbreak out etc. are taken away.
Blowout and well kick:When there is blowout or well kick, in well, mud or gas enter valve through fulcrum bearing reflux from bottom to top In vivo, all valve element can be produced under mud or gas and back-moving spring self-acting in well with thrust, the circular cone of valve element to On be pushed in lower valve base, by direct circulation slurry channel close;In addition from grouting channel be also close, therefore, it is possible to effective Prevent mud in well from regurgitating.
Beneficial effects of the present invention are mainly manifested in following aspect:
First, the present invention, is provided with piston in valve body, on valve element, valve seat includes upper valve base and lower valve base, upper valve seat to piston bush Between piston and valve body, upper valve base has mud backflow slotted eye, the inner space of mud backflow slotted eye and valve body, on valve body Have mud return port, mud return port is connected with mud backflow slotted eye, by arranging mud return port on valve body, in upper valve Setting mud backflow slotted eye on seat, makes the inner chamber of mud return port, mud backflow slotted eye and valve body form one and supplies mud in well The passage of slurry backflow, during lower brill, by by drilling tool, together with from grouting back pressure valve G.I.H, in well, mud is in pressure Effect is lower just can be back in drilling rod through mud return flow line in well, complete in drilling rod from grouting action;With prior art Compare, need not often put down a part of drilling rod and just connect provisions for grouting pouring into mud into drilling rod, after having filled, take off provisions for grouting again, Put into next and save drilling rod, be greatly reduced quantities, time saving and energy saving, and effectively reduce grouting cost;Valve element with Due to decreasing spring so that during direct circulation mud, valve element need not overcome the resistance of spring just can be promoted, and beats between bearing Open direct circulation slurry channel, direct circulation mud is more smooth, piston blocks mud backflow slotted eye under valve element drive simultaneously;When There is blowout or during well kick, in well mud or gas from bottom to top through in fulcrum bearing reflux inlet valve body, mud or gas in well In the presence of valve element be pushed in valve seat, by direct circulation slurry channel close;Mud flows back what slotted eye was blocked by piston again, because This can effectively prevent the inner chamber through valve body for the mud in well from regurgitating to drilling rod, ensures drilling safety.
2nd, the present invention, valve element includes upper valve rod, circular cone and lower valve rod, the upper end setting of upper valve rod from top to bottom successively There is fixing nut, lower end is connected with the small end of circular cone, lower valve rod one end is connected with the big end of circular cone, and the other end stretches into supporting In seat, can be matched with the inclined-plane of lower valve base by the big end toper face of circular cone, direct circulation slurry channel is blocked;Logical Cross be arranged on upper valve rod upper end fixing nut band piston move down such that it is able to block mud backflow slotted eye, when occur well When spray or well kick, mud in well can be prevented effectively from and regurgitate.
3rd, the present invention, lower valve rod is cased with back-moving spring, and back-moving spring is contacted with fulcrum bearing, by setting up back-moving spring, When direct circulation mud, after the circular cone of valve element is washed open by mud, because back-moving spring is contacted with fulcrum bearing, the work of back-moving spring Firmly a part can offset the impulse force that mud produces to circular cone, it is to avoid circular cone clashes into fulcrum bearing, being capable of effective protection cone Shape block, and then ensure the normal use of valve element;When there is blowout or well kick, the active force of back-moving spring can accelerate taper again The movement of block, makes valve element and valve seat rapid closing, prevents mud from regurgitating.
4th, the present invention, is provided with the first O-ring seals between circular cone and lower valve base, the first O-ring seals are nested in cone On the big end of shape block, after long-time use, easily produce gap between circular cone and lower valve base, by the first O-ring seals energy Enough carry out good sealing, and then can effectively prevent mud in well from entering direct circulation slurry channel regurgitating into drilling rod, enter one Step ensures drilling safety.
5th, the present invention, the big end of circular cone has spring groove, and one end of back-moving spring is contacted with the bottom of spring groove, The other end is contacted with fulcrum bearing, and during life-time service, valve element moves up and down, and back-moving spring also can ceaselessly compress and answer Position, by setting up spring groove, when direct circulation mud, a part for back-moving spring is contained in spring groove, when back-moving spring pressure When being reduced to a certain degree, the big end end face of circular cone is contacted with fulcrum bearing, is prevented from back-moving spring and is overly compressed and deforms, Ensure the stability in use of back-moving spring, enable circular cone parking position accuracy to carry out good fitting with lower valve base, prevent in well Mud is regurgitated;Back-moving spring will not be overly compressed it becomes possible to reduce the swinging such that it is able to reduce reset of back-moving spring The probability of spring slam lower valve rod, extends the service life of whole valve element.
6th, the present invention, upper valve base has mounting groove, and mounting groove is connected with mud return port and mud backflow slotted eye respectively Logical, check valve is installed in mounting groove, by the setting of check valve, in a permission well, mud enters it is impossible to from interior from outside to inside To external leakage;During state of being certainly in the milk, in well, mud can enter through mud return port, check valve and mud backflow slotted eye successively The inner chamber of valve body, after through valve body inner chamber enter drilling rod, complete in drilling rod from be in the milk, direct circulation slurry condition, when a large amount of Mud pours in valve body, and check valve just can stop and enters into mud backflash in the hole by the gap between upper valve base and valve body Mud, further pass through check valve from mud return port let out such that it is able to save grouting cost.
7th, the present invention, check valve includes limit spring and backflow steel ball, one end of limit spring and the top of mounting groove Contact, the other end contacts with backflow steel ball, and backflow steel ball is stuck on the bottom of mounting groove, using specific limit spring with Backflow steel ball as check valve, from grouting state when, in well mud through mud return port enter mud backflow slotted eye when, in well In the presence of interior mud, backflow steel ball is extruded limit spring by thrust upwards, so that backflow steel ball departs from peace The bottom plate rabbet of tankage, mud return port is connected with mud backflow slotted eye, completes drilling rod from grouting;And in direct circulation muddy State, backflow steel ball is in the presence of self gravitation and limit spring it becomes possible to block the bottom plate rabbet of mounting groove, backflow Steel ball is curved surface, it is possible to increase plugging effect, and then prevents mud from leaking;Additionally, adopting limit spring and backflow steel ball, tool There is installation simple, the low feature of maintenance cost.
8th, the present invention, piston has locating slot, is provided with retaining spring and locking ball, on upper valve base in locating slot At least have two groups of grooves being adapted with locking ball, from grouting back pressure valve when not using, locking ball is positioned bullet Spring is squeezed in the groove of upper valve base, and piston can be positioned, and when direct circulation mud, mud squeezes to retaining spring Pressure, retaining spring is compressed, and locking ball departs from groove, drives lower piston just can move down in the fixing bolt of valve element, enters And open direct circulation slurry channel, when piston moves to next and organizes groove, locking ball is just embedding in the presence of retaining spring Enter in groove, stop piston from moving down further, reduce piston shift motion, it is to avoid the big end end face of circular cone clashes into Bearing, can not only extend the service life of whole valve element, and be prevented from circular cone because clash into impaired and can not be with lower valve Seat carries out good laminating such that it is able to prevent mud in well from regurgitating further.
9th, the present invention, the inwall of valve body is provided with step, and step is provided with pressure cap, and pressure cap is located above piston, pressure Cap is threaded connection with valve body, piston and upper valve base can be carried out by setting pressure cap spacing, prevent from grouting state When, in well, piston and upper valve base are washed from valve body by mud, can ensure the whole stability in use from the back pressure valve that is in the milk.
Tenth, the present invention, is provided with the second O-ring seals between lower valve base and valve body, the second O-ring seals are enclosed within lower valve base On, by increasing capacitance it is possible to increase the sealing between lower valve base and valve body, in blowout or well kick, prevent in well mud through lower valve base and valve body Between gap backflow, mud counter-jetting resistance effect in well can be strengthened.
11, the present invention, is provided with the 3rd O-ring seals between upper valve base and valve body, the 3rd O-ring seals are enclosed within upper valve On seat, by increasing capacitance it is possible to increase the sealing between upper valve base and valve body, in blowout or well kick, prevent mud in well from passing through down further Flowing back through the gap between upper valve base and valve body in gap between valve seat and valve body, improves counter-jetting resistance effect.
12, the present invention, is provided with the 4th O-ring seals between piston and upper valve base, the 4th O-ring seals are enclosed within piston On, by increasing capacitance it is possible to increase the sealing between piston and upper valve base, when preventing direct circulation mud, mud is through between piston and upper valve base Gap is flowed into mud backflash in the hole, can effectively prevent mud from leaking.
13, the present invention, circular cone has opening, and opening is connected with spring groove, is easy to liquid during direct circulation mud The flowing of body, ensures the smoothness of direct circulation mud.
14, the present invention, upper valve base and lower valve base are formed in one and form, and structural strength is high, can extend upper valve base and The service life of lower valve base, reduces replacement cost;Lower valve base is adapted with circular cone, can play good in blowout or well kick Plugging effect, prevent mud in well from regurgitating.
Brief description
Below in conjunction with specification drawings and specific embodiments, the present invention is described in further detail, wherein:
Fig. 1 is the structural representation of the present invention;
Fig. 2 is the structural representation of the embodiment of the present invention 2;
Fig. 3 is the structural representation of the embodiment of the present invention 3;
Fig. 4 is the structural representation of the embodiment of the present invention 4;
Fig. 5 is from structural representation when being in the milk in the embodiment of the present invention 5;
Fig. 6 is structural representation during direct circulation mud in the embodiment of the present invention 5;
Fig. 7 is structural representation when blowout in the embodiment of the present invention 5 or well kick;
In figure labelling:1st, valve body, 2, valve element, 3, fulcrum bearing, 4, valve seat, 5, piston, 6, upper valve base, 7, lower valve base, 8, mud returns Chute hole, 9, mud return port, 10, upper valve rod, 11, circular cone, 12, lower valve rod, 13, fixing nut, 14, back-moving spring, 15, First O-ring seals, 16, spring groove, 17, mounting groove, 18, check valve, 19, limit spring, 20, backflow steel ball, 21, positioning Groove, 22, retaining spring, 23, locking ball, 24, groove, 25, step, 26, pressure cap, the 27, second O-ring seals, the 28, the 3rd O Shape sealing ring, the 29, the 4th O-ring seals, 30, opening.
Specific embodiment
Embodiment 1
Referring to Fig. 1, a kind of from the back pressure valve that is in the milk, including valve body 1, valve element 2 and be arranged on fulcrum bearing 3 and valve seat in valve body 1 4, fulcrum bearing 3 is located at below valve seat 4, is provided with piston 5, described piston 5 is enclosed within valve element 2, described valve seat 4 in described valve body 1 Including upper valve base 6 and lower valve base 7, upper valve base 6 is located between piston 5 and valve body 1, and described upper valve base 6 has mud backflash Hole 8, mud backflow slotted eye 8 and the inner space of valve body 1, described valve body 1 has mud return port 9, described mud return port 9 Connect with mud backflow slotted eye 8.
The present embodiment is most basic embodiment, is provided with piston in valve body, and on valve element, valve seat includes piston bush Valve seat and lower valve base, upper valve base be located between piston and valve body, upper valve base has mud backflow slotted eye, mud backflow slotted eye with The inner space of valve body, valve body has mud return port, mud return port is connected with mud backflow slotted eye, by valve body Setting mud return port, setting mud backflow slotted eye on upper valve base, make mud return port, mud backflow slotted eye and valve body Inner chamber formed one supply well in mud backflow passage, during lower brill, by by drilling tool together with from grouting back pressure valve one remove into In well, in well, mud just can be back in drilling rod through mud return flow line in well under the effect of the pressure, completes in drilling rod From grouting action;Compared with prior art, need not often put down a part of drilling rod and just connect provisions for grouting and pour into mud into drilling rod, Take off provisions for grouting again after having filled, put into next and save drilling rod, be greatly reduced quantities, time saving and energy saving, and effectively reduce Grouting cost;Due to decreasing spring so that during direct circulation mud, valve element need not overcome spring between valve element and fulcrum bearing Resistance just can be promoted, open direct circulation slurry channel, direct circulation mud is more smooth, simultaneously piston valve element drive under Block mud backflow slotted eye;When there is blowout or well kick, in well, mud or gas enter valve through fulcrum bearing reflux from bottom to top In vivo, in well, in the presence of mud or gas, valve element is pushed in valve seat, and direct circulation slurry channel is closed;Mud backflash Hole is blocked by piston again, therefore, it is possible to effectively prevent the inner chamber through valve body for the mud in well from regurgitating to drilling rod, ensures drilling well Safety.
Embodiment 2
Referring to Fig. 2, a kind of from the back pressure valve that is in the milk, including valve body 1, valve element 2 and be arranged on fulcrum bearing 3 and valve seat in valve body 1 4, fulcrum bearing 3 is located at below valve seat 4, is provided with piston 5, described piston 5 is enclosed within valve element 2, described valve seat 4 in described valve body 1 Including upper valve base 6 and lower valve base 7, upper valve base 6 is located between piston 5 and valve body 1, and described upper valve base 6 has mud backflash Hole 8, mud backflow slotted eye 8 and the inner space of valve body 1, described valve body 1 has mud return port 9, described mud return port 9 Connect with mud backflow slotted eye 8.
Described valve element 2 includes upper valve rod 10, circular cone 11 and lower valve rod 12 from top to bottom successively, and the upper end of upper valve rod 10 sets It is equipped with fixing nut 13, lower end is connected with the small end of circular cone 11, lower valve rod 12 one end is connected with the big end of circular cone 11, another End is stretched in fulcrum bearing 3.
Back-moving spring 14 is cased with described lower valve rod 12, back-moving spring 14 is contacted with fulcrum bearing 3.
It is provided with the first O-ring seals 15, the first O-ring seals 15 are nested between described circular cone 11 and lower valve base 7 On the big end of circular cone 11.
The present embodiment is a better embodiment, and valve element includes upper valve rod, circular cone and lower valve rod from top to bottom successively, on The upper end of valve rod is provided with fixing nut, and lower end is connected with the small end of circular cone, and lower valve rod one end is connected with the big end of circular cone, The other end stretches in fulcrum bearing, can be matched with the inclined-plane of lower valve base by the big end toper face of circular cone, by direct circulation mud Slurry passage plugging is lived;Moved down by the fixing nut band piston being arranged on upper valve rod upper end and return such that it is able to block mud Chute hole, when there is blowout or well kick, can be prevented effectively from mud in well and regurgitating.Back-moving spring is cased with lower valve rod, resets Spring is contacted with fulcrum bearing, by setting up back-moving spring, when direct circulation mud, after the circular cone of valve element is washed open by mud, by Contact with fulcrum bearing in back-moving spring, the active force of back-moving spring a part can offset the impulse force that mud produces to circular cone, Avoid circular cone clash into fulcrum bearing, can effective protection circular cone, and then ensure valve element normal use;When generation blowout or well When gushing, the active force of back-moving spring can accelerate the movement of circular cone again, make valve element and valve seat rapid closing, prevent mud anti- Spray.It is provided with the first O-ring seals, the first O-ring seals are nested on the big end of circular cone between circular cone and lower valve base, long After time uses, between circular cone and lower valve base, easily produce gap, can be carried out by the first O-ring seals good close Envelope, and then can effectively prevent mud entrance direct circulation slurry channel in well from regurgitating into drilling rod, it is further ensured that drilling safety.
Embodiment 3
Referring to Fig. 3, a kind of from the back pressure valve that is in the milk, including valve body 1, valve element 2 and be arranged on fulcrum bearing 3 and valve seat in valve body 1 4, fulcrum bearing 3 is located at below valve seat 4, is provided with piston 5, described piston 5 is enclosed within valve element 2, described valve seat 4 in described valve body 1 Including upper valve base 6 and lower valve base 7, upper valve base 6 is located between piston 5 and valve body 1, and described upper valve base 6 has mud backflash Hole 8, mud backflow slotted eye 8 and the inner space of valve body 1, described valve body 1 has mud return port 9, described mud return port 9 Connect with mud backflow slotted eye 8.
Described valve element 2 includes upper valve rod 10, circular cone 11 and lower valve rod 12 from top to bottom successively, and the upper end of upper valve rod 10 sets It is equipped with fixing nut 13, lower end is connected with the small end of circular cone 11, lower valve rod 12 one end is connected with the big end of circular cone 11, another End is stretched in fulcrum bearing 3.
Back-moving spring 14 is cased with described lower valve rod 12, back-moving spring 14 is contacted with fulcrum bearing 3.
It is provided with the first O-ring seals 15, the first O-ring seals 15 are nested between described circular cone 11 and lower valve base 7 On the big end of circular cone 11.
Spring groove 16 is had on the big end of described circular cone 11, one end of back-moving spring 14 is connect with the bottom of spring groove 16 Touch, the other end is contacted with fulcrum bearing 3.
The present embodiment is another better embodiment, and the big end of circular cone has spring groove, one end of back-moving spring with The bottom contact of spring groove, the other end is contacted with fulcrum bearing, and during life-time service, valve element moves up and down, back-moving spring Also can ceaselessly compress and reset, by setting up spring groove, when direct circulation mud, a part for back-moving spring is contained in spring In groove, when back-moving spring compresses to a certain extent, the big end end face of circular cone is contacted with fulcrum bearing, is prevented from back-moving spring It is overly compressed and deforms, ensure the stability in use of back-moving spring, so that circular cone parking position accuracy and lower valve base is carried out good Good laminating, prevents mud in well from regurgitating;Back-moving spring will not be overly compressed it becomes possible to reduce the left and right pendulum of back-moving spring Move such that it is able to reduce the probability that back-moving spring clashes into lower valve rod, extend the service life of whole valve element.
Embodiment 4
Referring to Fig. 4, a kind of from the back pressure valve that is in the milk, including valve body 1, valve element 2 and be arranged on fulcrum bearing 3 and valve seat in valve body 1 4, fulcrum bearing 3 is located at below valve seat 4, is provided with piston 5, described piston 5 is enclosed within valve element 2, described valve seat 4 in described valve body 1 Including upper valve base 6 and lower valve base 7, upper valve base 6 is located between piston 5 and valve body 1, and described upper valve base 6 has mud backflash Hole 8, mud backflow slotted eye 8 and the inner space of valve body 1, described valve body 1 has mud return port 9, described mud return port 9 Connect with mud backflow slotted eye 8.
Described valve element 2 includes upper valve rod 10, circular cone 11 and lower valve rod 12 from top to bottom successively, and the upper end of upper valve rod 10 sets It is equipped with fixing nut 13, lower end is connected with the small end of circular cone 11, lower valve rod 12 one end is connected with the big end of circular cone 11, another End is stretched in fulcrum bearing 3.
Back-moving spring 14 is cased with described lower valve rod 12, back-moving spring 14 is contacted with fulcrum bearing 3.
It is provided with the first O-ring seals 15, the first O-ring seals 15 are nested between described circular cone 11 and lower valve base 7 On the big end of circular cone 11.
Spring groove 16 is had on the big end of described circular cone 11, one end of back-moving spring 14 is connect with the bottom of spring groove 16 Touch, the other end is contacted with fulcrum bearing 3.
Mounting groove 17 is had on described upper valve base 6, mounting groove 17 is connected with mud return port 9 and mud backflow slotted eye 8 respectively Logical, check valve 18 is installed in mounting groove 17.
Described check valve 18 includes limit spring 19 and backflow steel ball 20, one end of limit spring 19 and mounting groove 17 Top contact, the other end is contacted with backflow steel ball 20, and backflow steel ball 20 is stuck on the bottom of mounting groove 17.
The present embodiment be another better embodiment, upper valve base has mounting groove, mounting groove respectively with mud return port Connect with mud backflow slotted eye, check valve is installed in mounting groove, by the setting of check valve, in a permission well mud from outward to Interior entrance is it is impossible to leak from inside to outside;I.e. from grouting state when, in well mud can successively through mud return port, check valve and Mud flow back slotted eye enter valve body inner chamber, after through valve body inner chamber enter drilling rod, complete in drilling rod from be in the milk, direct circulation Slurry condition, when a large amount of mud pour in valve body, check valve just can stop by the gap entrance between upper valve base and valve body To the mud of mud backflash in the hole, further pass through check valve and let out such that it is able to save grouting from mud return port Cost.Check valve includes limit spring and backflow steel ball, one end of limit spring and the top contact of mounting groove, the other end with Backflow steel ball contacts, and backflow steel ball is stuck on the bottom of mounting groove, is made using specific limit spring and backflow steel ball For check valve, certainly during grouting state, when in well, mud enters mud backflow slotted eye through mud return port, the effect of mud in well Under, backflow steel ball is extruded limit spring by thrust upwards, so that backflow steel ball departs from the base channel of mounting groove Mouthful, mud return port is connected with mud backflow slotted eye, completes drilling rod from grouting;And in direct circulation slurry condition, backflow steel It becomes possible to block the bottom plate rabbet of mounting groove in the presence of self gravitation and limit spring, backflow steel ball is curved surface to ball, Plugging effect can be improved, and then prevent mud from leaking;Additionally, adopting limit spring and backflow steel ball, there is installation simply, The low feature of maintenance cost.
Embodiment 5
Referring to Fig. 5-Fig. 7, a kind of from the back pressure valve that is in the milk, including valve body 1, valve element 2 and be arranged on fulcrum bearing 3 and in valve body 1 Valve seat 4, fulcrum bearing 3 is located at below valve seat 4, is provided with piston 5, described piston 5 is enclosed within valve element 2, described valve in described valve body 1 Seat 4 includes upper valve base 6 and lower valve base 7, and upper valve base 6 is located between piston 5 and valve body 1, and described upper valve base 6 has mud backflow Slotted eye 8, mud backflow slotted eye 8 and the inner space of valve body 1, described valve body 1 has mud return port 9, described mud backflow Hole 9 is connected with mud backflow slotted eye 8.
Described valve element 2 includes upper valve rod 10, circular cone 11 and lower valve rod 12 from top to bottom successively, and the upper end of upper valve rod 10 sets It is equipped with fixing nut 13, lower end is connected with the small end of circular cone 11, lower valve rod 12 one end is connected with the big end of circular cone 11, another End is stretched in fulcrum bearing 3.
Back-moving spring 14 is cased with described lower valve rod 12, back-moving spring 14 is contacted with fulcrum bearing 3.
It is provided with the first O-ring seals 15, the first O-ring seals 15 are nested between described circular cone 11 and lower valve base 7 On the big end of circular cone 11.
Spring groove 16 is had on the big end of described circular cone 11, one end of back-moving spring 14 is connect with the bottom of spring groove 16 Touch, the other end is contacted with fulcrum bearing 3.
Mounting groove 17 is had on described upper valve base 6, mounting groove 17 is connected with mud return port 9 and mud backflow slotted eye 8 respectively Logical, check valve 18 is installed in mounting groove 17.
Described check valve 18 includes limit spring 19 and backflow steel ball 20, one end of limit spring 19 and mounting groove 17 Top contact, the other end is contacted with backflow steel ball 20, and backflow steel ball 20 is stuck on the bottom of mounting groove 17.
Locating slot 21 is had on described piston 5, retaining spring 22 and locking ball 23, upper valve base are installed in locating slot 21 Two groups of grooves being adapted with locking ball 23 24 are at least had on 6.
Step 25 is provided with the inwall of described valve body 1, step 25 is provided with pressure cap 26, pressure cap 26 is located on piston 5 Side, pressure cap 26 is threaded connection with valve body 1.
It is provided with the second O-ring seals 27, the second O-ring seals 27 are enclosed within lower valve base between described lower valve base 7 and valve body 1 On 7.
It is provided with the 3rd O-ring seals 28, the 3rd O-ring seals 28 are enclosed within upper valve base between described upper valve base 6 and valve body 1 On 6.
It is provided with the 4th O-ring seals 29, the 4th O-ring seals 29 are enclosed within piston 5 between described piston 5 and upper valve base 6 On.
Opening 30 is had on described circular cone 11, opening 30 is connected with spring groove 16.
Described upper valve base 6 and lower valve base 7 are formed in one and form, and lower valve base 7 is adapted with circular cone 11.
The present embodiment is preferred forms, piston has locating slot, is provided with retaining spring and positioning in locating slot Steel ball, upper valve base is at least had two groups of grooves being adapted with locking ball, from grouting back pressure valve when not using, positioning Steel ball is positioned spring and is squeezed in the groove of upper valve base, and piston can be positioned, and when direct circulation mud, mud is to fixed Position spring is extruded, and retaining spring is compressed, and locking ball departs from groove, drives lower piston just can in the fixing bolt of valve element Move down, and then open direct circulation slurry channel, when piston moves to next and organizes groove, locking ball is just in retaining spring In the presence of be embedded in groove, stop piston move down further, reduce piston shift motion, it is to avoid the big end of circular cone End face clashes into fulcrum bearing, can not only extend the service life of whole valve element, and is prevented from circular cone because shock is impaired Good fitting such that it is able to prevent mud in well from regurgitating further can not be carried out with lower valve base.It is provided with the inwall of valve body Step, step is provided with pressure cap, and pressure cap is located above piston, and pressure cap is threaded connection with valve body, by arranging pressure cap energy Enough piston and upper valve base are carried out spacing, prevent from be in the milk state when, in well, piston and upper valve base are washed from valve body, energy by mud Enough stability in uses ensureing the whole back pressure valve that is certainly in the milk.It is provided with the second O-ring seals between lower valve base and valve body, second O-ring seals are enclosed within lower valve base, by increasing capacitance it is possible to increase the sealing between lower valve base and valve body, in blowout or well kick, prevent well Interior mud flows back through the gap between lower valve base and valve body, can strengthen mud counter-jetting resistance effect in well.Upper valve base and valve body it Between be provided with the 3rd O-ring seals, the 3rd O-ring seals are enclosed within upper valve base, by increasing capacitance it is possible to increase close between upper valve base and valve body Feng Xing, in blowout or well kick, prevents in well mud through the gap lower valve base and valve body through upper valve base and valve further Gap backflow between body, improves counter-jetting resistance effect.It is provided with the 4th O-ring seals, the 4th O shape is close between piston and upper valve base Seal is enclosed within piston, by increasing capacitance it is possible to increase the sealing between piston and upper valve base, when preventing direct circulation mud, mud through piston with Gap between upper valve base is flowed into mud backflash in the hole, can effectively prevent mud from leaking.Opening is had on circular cone, Opening is connected with spring groove, is easy to the flowing of liquid during direct circulation mud, ensures the smoothness of direct circulation mud.Upper valve base and Lower valve base is formed in one and forms, and structural strength is high, can extend the service life of upper valve base and lower valve base, reduction is replaced with This;Lower valve base is adapted with circular cone, can play good plugging effect in blowout or well kick, prevents mud in well anti- Spray.

Claims (14)

1. a kind of back pressure valve that is certainly in the milk, including valve body(1), valve element(2)And it is arranged on valve body(1)Interior fulcrum bearing(3)And valve Seat(4), fulcrum bearing(3)Positioned at valve seat(4)Lower section it is characterised in that:Described valve body(1)Inside it is provided with piston(5), described piston (5)It is enclosed within valve element(2)On, described valve seat(4)Including upper valve base(6)And lower valve base(7), upper valve base(6)Positioned at piston(5)And valve Body(1)Between, described upper valve base(6)On have mud backflow slotted eye(8), mud backflow slotted eye(8)With valve body(1)Inner chamber even Logical, described valve body(1)On have mud return port(9), described mud return port(9)With mud backflow slotted eye(8)Connection.
2. according to claim 1 a kind of from be in the milk back pressure valve it is characterised in that:Described valve element(2)From top to bottom according to Secondary inclusion upper valve rod(10), circular cone(11)And lower valve rod(12), upper valve rod(10)Upper end be provided with fixing nut(13), under End and circular cone(11)Small end connect, lower valve rod(12)One end and circular cone(11)Big end connect, the other end stretches into supporting Seat(3)Interior.
3. according to claim 2 a kind of from be in the milk back pressure valve it is characterised in that:Described lower valve rod(12)On be cased with multiple Position spring(14), back-moving spring(14)With fulcrum bearing(3)Contact.
4. according to claim 2 a kind of from be in the milk back pressure valve it is characterised in that:Described circular cone(11)With lower valve base (7)Between be provided with the first O-ring seals(15), the first O-ring seals(15)It is nested in circular cone(11)Big end on.
5. according to claim 3 a kind of from be in the milk back pressure valve it is characterised in that:Described circular cone(11)Big end on Have spring groove(16), back-moving spring(14)One end and spring groove(16)Bottom contact, the other end and fulcrum bearing(3)Connect Touch.
6. according to claim 1 a kind of from be in the milk back pressure valve it is characterised in that:Described upper valve base(6)On have peace Tankage(17), mounting groove(17)Respectively with mud return port(9)With mud backflow slotted eye(8)Connection, mounting groove(17)Interior installation There is check valve(18).
7. according to claim 6 a kind of from be in the milk back pressure valve it is characterised in that:Described check valve(18)Including spacing Spring(19)With backflow steel ball(20), limit spring(19)One end and mounting groove(17)Top contact, the other end with only Backflow steel ball(20)Contact, backflow steel ball(20)It is stuck in mounting groove(17)Bottom on.
8. according to claim 1 a kind of from be in the milk back pressure valve it is characterised in that:Described piston(5)On have positioning Groove(21), locating slot(21)Retaining spring is inside installed(22)And locking ball(23), upper valve base(6)On at least have two groups with Locking ball(23)The groove being adapted(24).
9. according to claim 1 a kind of from be in the milk back pressure valve it is characterised in that:Described valve body(1)Inwall on set It is equipped with step(25), step(25)On be provided with pressure cap(26), pressure cap(26)Positioned at piston(5)Top, pressure cap(26)With valve body (1)It is threaded connection.
10. according to claim 1 a kind of from be in the milk back pressure valve it is characterised in that:Described lower valve base(7)With valve body (1)Between be provided with the second O-ring seals(27), the second O-ring seals(27)It is enclosed within lower valve base(7)On.
11. according to claim 1 a kind of from be in the milk back pressure valves it is characterised in that:Described upper valve base(6)With valve body (1)Between be provided with the 3rd O-ring seals(28), the 3rd O-ring seals(28)It is enclosed within upper valve base(6)On.
12. according to claim 1 a kind of from be in the milk back pressure valves it is characterised in that:Described piston(5)With upper valve base (6)Between be provided with the 4th O-ring seals(29), the 4th O-ring seals(29)It is enclosed within piston(5)On.
13. according to claim 5 a kind of from be in the milk back pressure valves it is characterised in that:Described circular cone(11)On have Opening(30), opening(30)With spring groove(16)Connection.
14. according to claim 2 a kind of from be in the milk back pressure valves it is characterised in that:Described upper valve base(6)And lower valve base (7)It is formed in one and form, lower valve base(7)With circular cone(11)It is adapted.
CN201611159813.0A 2016-12-15 2016-12-15 A kind of grouting back pressure valve certainly Active CN106401514B (en)

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Publication number Priority date Publication date Assignee Title
CN106996279A (en) * 2017-06-02 2017-08-01 成都市卓新实业有限公司 A kind of self-priming paddle back pressure valve
CN107035334A (en) * 2017-02-24 2017-08-11 西南石油大学 It is a kind of with drilling through well instrument

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CN204040997U (en) * 2014-06-27 2014-12-24 吴宪文 From grouting floating hoop float shoe
CN104314492A (en) * 2014-08-28 2015-01-28 成都市容德建筑劳务有限公司 Application method of bypass valve
CN204729049U (en) * 2015-06-10 2015-10-28 新疆再兴科苑石油科技有限公司 From grouting floating hoop
CN206376774U (en) * 2016-12-15 2017-08-04 成都市卓新实业有限公司 A kind of grouting back pressure valve certainly

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CN2061206U (en) * 1989-08-25 1990-08-29 四川省石油管理局川东钻探公司 Self-injecting mud back-pressure valve
EP1604093A2 (en) * 2003-03-13 2005-12-14 Tesco Corporation Method and apparatus for drilling a borehole with a borehole liner
US7234545B2 (en) * 2003-12-12 2007-06-26 Pinol Hugo Luis Self-blocking safety device
CN2740771Y (en) * 2004-11-27 2005-11-16 四川石油管理局川东钻探公司 Self-pulping arrow back pressure valve
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CN203756117U (en) * 2013-12-31 2014-08-06 田玉龙 Self-grouting rotational flow float collar
CN204040997U (en) * 2014-06-27 2014-12-24 吴宪文 From grouting floating hoop float shoe
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107035334A (en) * 2017-02-24 2017-08-11 西南石油大学 It is a kind of with drilling through well instrument
CN107035334B (en) * 2017-02-24 2019-10-18 四川省威沃敦化工有限公司 One kind is with drilling through well tool
CN106996279A (en) * 2017-06-02 2017-08-01 成都市卓新实业有限公司 A kind of self-priming paddle back pressure valve

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