CN101363305A - Long-life high performance air hammer - Google Patents

Long-life high performance air hammer Download PDF

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Publication number
CN101363305A
CN101363305A CNA2008100462433A CN200810046243A CN101363305A CN 101363305 A CN101363305 A CN 101363305A CN A2008100462433 A CNA2008100462433 A CN A2008100462433A CN 200810046243 A CN200810046243 A CN 200810046243A CN 101363305 A CN101363305 A CN 101363305A
Authority
CN
China
Prior art keywords
drill bit
casing
spring
shell
distribution seat
Prior art date
Application number
CNA2008100462433A
Other languages
Chinese (zh)
Inventor
祝效华
凌玉梅
童华
高原
Original Assignee
西南石油大学
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 西南石油大学 filed Critical 西南石油大学
Priority to CNA2008100462433A priority Critical patent/CN101363305A/en
Publication of CN101363305A publication Critical patent/CN101363305A/en

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Abstract

The invention relates to a long-life high-performance pneumatic hammer which is used in a petroleum and natural gas drilled hole and can effectively improve the service life and increase the integral performance of the pneumatic hammer. In the technical proposal, the upper end of a casing is connected with an upper joint by screw threads; the lower end of the casing is connected with a lower joint by the screw threads; the lower joint is connected with a drill bit spline; a casing inner cavity is ladder-shaped; a central hole of a distribution base is equipped with an inverted valve and a spring. A disc spring is installed between the upper joint and the distribution base; an inner cylinder is installed in the casing inner cavity; the outer surface of the inner cylinder is symmetrically distributed with four lines of axial flat slots which are processed with radial gas circulating hole; a piston is filled in the inner cylinder; the drill bit is equipped with a ring slot installing snap ring; the outer circle of the drill bit is provided with a circle of gauge teeth; a seal gasket is installed at a matching surface of the inner cylinder and the distribution base. The pneumatic hammer has two characteristics of long life and high performance and can improve the service life and increase the integral performance of the pneumatic hammer; and the pneumatic hammer has simple structure and can be used in the petroleum and natural gas driller hole.

Description

A kind of long-life high performance air hammer
Technical field
The present invention relates to a kind of long-life high performance air hammer that is used for oil and gas well drilling, be suitable for causing the gas drilling operating mode that the air hammer life-span is short, mechanical efficiency is not high owing to seal failure, spring breakage, impact or strong vibration cause the connector inefficacy.
Background technology
Gas drilling is with the drilling technology of gas as circulatory mediator, since 19th-century uses mid-term first, now has been widely used in the probing and exploitation of oil gas well (comprising coal bed gas) all over the world.The air hammer drilling technology is a branch of gas drilling technology, the air hammer drilling technology by universally acknowledged for be shorten drilling period, reduce drilling cost, a kind of practical technique of liberation oil-gas Layer.Be applied to the air hammer drilling technology in the oil-gas drilling at present, showed lot of superiority in using at the scene, as protecting oil-gas Layer, increase substantially rate of penetration and administering leakage or the like.Even like this, also exposed many technical problems, the general life-span of air hammer in promptly using at present is not long, and mechanical efficiency is not high, and failure accidents often takes place.Discover according to in-situ data, the weak point in application life of air hammer, unstable properties, be in particular in that seal and spring part easily lost efficacy, drill bit drops, bore the tooth several aspects such as the decline of complete machine performance is fast behind the certain hour that come off, works, this severe inhibition air hammer drilling technology advantage performance and apply.
Summary of the invention
The objective of the invention is: in order to prevent or significantly to slow down owing to impact, strong vibration, friction cause that gas drilling air hammer seal fails, connector lost efficacy, the internal part friction loss is big, problem such as the fluid energy loss is many, bulk life time is low and performance degradation is serious, for effectively improving air hammer application life and strengthen its overall performance, a kind of long-life high performance air hammer of special proposition.
In order to achieve the above object, the technical scheme that head it off of the present invention adopted is, a kind of long-life high performance air hammer, form by top connection, non retern valve, spring, dish spring group, distribution seat, inner casing, shell, gasket seal, self compensation black box, damping pad group, chuck, snap ring, drill bit, it is characterized in that: the shell upper end is connected with top connection with screw thread, the shell lower end is connected with lower contact with screw thread, and lower contact is connected with the drill bit spline again, and shell inner cavity is stepped; Distribution seat centre bore is equipped with non retern valve, spring, and the non retern valve tip designs coning is equipped with dish spring group between top connection and the distribution seat, and dish spring group adopts the superposed type combination; Inner casing is installed in shell inner cavity, and the upper end is positioned the step of distribution seat, and the lower end is positioned the step of shell inner cavity, and the inner casing external surface is symmetrically distributed with four roads and axially rises as high as the banks, and is processed with gas communication hole radially in the groove, dress piston in the inner casing; Drill bit is processed with annular groove snap ring is installed, and the drill bit cylindrical is provided with a circle gauge teeth; Inner casing and distribution seat fitting face are equipped with gasket seal, and gasket seal is made by the polytetrafluoroethylene (PTFE) rubber ring.
Have 12 gas communication holes on the distribution seat, distribution seat foot piece surface has 5~10 road cannelures.Damping pad is being installed between shell and the lower contact; Damping pad down is installed between lower contact and drill bit.At piston center hole afterbody and top, bit central hole the self compensation black box is installed, the self compensation black box is made up of rubber sleeve, spring and steel bushing; The friction portion that is subjected to of rubber sleeve embeds spring, and the bottom is not subjected to the friction portion diameter to be subjected to friction portion greater than top; The inner headed face of rubber sleeve and steel bushing carry out interference fit, and the outstanding step in steel bushing upper end is pressed in the upper surface of rubber sleeve.Rubber sleeve is selected for use can be high temperature resistant, the material of rub resistance, with polyimides PI or polyether-ether-ketone PEEK.Spring is stretching in the rubber sleeve in advance, rubber sleeve external surface taking up wear, and inner surface is limited by steel bushing, and rubber sleeve is worn in the course of work, and spring produces compression reaction power and drives the rubber sleeve compression, and deformation from inside to outside takes place, and plays self-compensating effect.
Long-life is guaranteed by following measure: 1. housing and axle part adopt CAE software to carry out strength check; 2. seal adopts the self compensation black box, can adapt to the strong friction environment of high temperature; 3. air hammer and air drill bit link can stop impact energy (the descending energy of air hammer on return the upwards impact energy (this energy is provided by the pressure of the drill) that part, irregular shaft bottom produce drill bit) upwards to be transmitted vertically, make the connecting thread (and connecting thread of bottomhole assembly) of air hammer and drill bit not bear or bear impact seldom, thereby can prolong the application life of air hammer and other bottomhole assembly connecting thread, prevent the drill bit well that falls; 4. use the butterfly spring to replace common spring, it is higher to adapt to little draw ratio working space, application life.
High-performance is guaranteed by following measure: 1. the distribution holder structure has 12 through holes, and runner is more unobstructed, distribution efficient height; 2. distribution seat top uses butterfly spring group to replace common spring, and damping property is more steady; 3. distribution seat afterbody has a plurality of annular grooves, when guaranteeing sealing, and the energy loss of reducing friction; 4. piston end and drill bit contact area are moderate, reduce because of the long-pending contact energy loss of bringing of large contact surface, improve energy transfer efficiency; 5. the non retern valve top shape has very strong guide functions, and sealing performance is better.
Compared with prior art, the present invention has following beneficial effect: (1) the present invention has long and performance high two big features of life-span, can effectively improve air hammer application life and strengthen its overall performance; (2) its distribution efficient height, good sealing effect, the frictional dissipation little energy, the functional reliability height, output performance is stable; (3) it is simple in structure, can improve the overall technology economic benefit of air hammer, can be used in the petroleum gas gas drilling.
Description of drawings
Fig. 1 is the structural representation of long-life high performance air hammer of the present invention.
Among the figure: 1 top connection, 2 non retern valves, 3 springs, 4 dish spring groups, 5 gasket seals, 6 distribution seats, 7 inner casings, 8 shells, 9 pistons, 10 pads, 11 self compensation black boies, damping pad on 12,13 snap rings, 14 lower contacts, 15 times damping pads, 16 drill bits, A lower chamber, B upper chamber.
Fig. 2 is the sectional drawing of distribution seat 6 in the air hammer of the present invention.
Fig. 3 is the vertical view of distribution seat 6 in the air hammer of the present invention.
Among the figure: 6a. gas communication hole.
Fig. 4 is the structural representation of self compensation black box 11 in the air hammer of the present invention.
Among the figure: 11a. rubber sleeve, 11b. spring, 11c. steel bushing.
The specific embodiment
According to shown in Figure 1, the operating principle of air hammer is: gas enters from top connection 1 centre bore, divides the two-way operation, and one tunnel radial hole and axial hole through non retern valve 2, the central through hole of distribution seat 6, piston 9 and drill bit 16 cool off drill bit and winding-up landwaste to the shaft bottom; Another road is through the axial hole and the radial hole of distribution seat 6, enter the annular gap of shell 8 and inner casing 7, through the exhaust notch of inner casing 7 lower ends to the annular space between piston 9 and the shell 8, enter air hammer lower chamber A, lower chamber A air inlet this moment, upper chamber B exhaust, the piston 9 that is in bottom dead centre is up under back pressure and lower chamber A effect, contact lower chamber A air inlet this moment, upper chamber B sealing with distribution seat 6 up to piston 9.Back pressure and calm the anger and continue to promote piston and move upward, lower chamber A air inlet, upper chamber B compression is got out of a predicament or an embarrassing situation when contacting with shell 8 internal chamber walls when piston 9, and lower chamber A and upper chamber B seal.Piston 9 is because inertia and back pressure effect continue uply, and lower chamber A sealing up to the internal chamber wall disengaging of piston 9 upper ends and inner casing 7, is calmed the anger through enter upper chamber B between inner casing 7 and the distribution seat 6 of the exhaust notch of inner casing 7 lower ends, and upper chamber B begins air inlet.Piston 9 continues up, and when piston 9 separated with self compensation black box 11, lower chamber A calmed the anger through self compensation black box 11 centre bores, and the gas passage of drill bit 16 (centre bore, steam vent) is discharged.Still air inlet of upper chamber B, lower chamber A exhaust.When piston 9 moved to top dead-centre, backhaul ended.Then upper chamber B calm the anger and the deadweight effect under, piston 9 begins again to move downward, and changes ballistic motion over to.Upper chamber B is in the air inlet state, lower chamber A exhaust.Move downward in the process, lower chamber A exhaust finishes when piston 9 lower surfaces move to contact self compensation black box 11, and piston 9 is descending, lower chamber A sealing, still air inlet of upper chamber B.When piston 9 upper surfaces contact inner casing 7, upper chamber B sealing, it is descending that gas expansion for doing work promotes piston 9, and when getting out of a predicament or an embarrassing situation of piston 9 broke away from shell 9 internal chamber walls, lower chamber A began air inlet, piston 9 continues descending, when its upper surface breaks away from distribution seat 6, upper chamber B exhaust, this moment, lower chamber A continued air inlet, piston 9 continues to come downwards to bottom dead centre, bump drill bit 16.Stroke finishes, and changes next backhaul again over to.Air hammer so moves in circles back, stroke, and drill hammer realizes that broken rock creeps into.
According to shown in Figure 1, it is conical that non retern valve 2 tops of design are, and is more conducive to that gas is unobstructed to flow, and alleviated the erosion effect of gas to non retern valve 2 tops, and fluid energy loses still less, and the application life of non retern valve 2 is higher.
According to shown in Figure 1, the dish spring group 4 between top connection 1 and the distribution seat 6 adopts the superposed type combination, and damping performance is better than common spring, can effectively alleviate piston 9 up impacts to distribution seat 6 and top connection 1.
According to shown in Figure 2, the distribution seat 6 of design has 12 gas communication holes, the flow field is unobstructed, thereby reduced the loss of fluid energy on the distribution seat, distribution seat 6 still has enough safety of structure after opening 12 through holes, the design of slotting of distribution seat 6 foot pieces reduces the frictional force when cooperating with piston, also makes sealing effectiveness better.
According to Fig. 1 and shown in Figure 4, when starting working, rubber sleeve 11a has enough intensity, and rubber sleeve 11a external surface bears uniform wear; Behind the work certain hour, the wearing and tearing of rubber sleeve 11a external surface are serious gradually, rubber sleeve 11a intensity weakens, produced compression reaction power by the spring 11b of prestretched this moment, drive rubber sleeve 11a compression, rubber sleeve 11a inner surface is subjected to the radially restriction of steel bushing 11c, and deformation takes place rubber sleeve 11a by compression from inside to outside, thereby plays self-compensating effect.Rubber sleeve 11a wearing and tearing are serious more, and intensity reduces low more, and compensating action is big more.

Claims (5)

1, a kind of long-life high performance air hammer is made up of top connection, non retern valve, spring, dish spring group, distribution seat, inner casing, shell, gasket seal, self compensation black box, damping pad group, snap ring, drill bit.It is characterized in that: shell (8) upper end is connected with top connection (1) with screw thread, and shell (8) lower end is connected with lower contact (14) with screw thread, and lower contact (14) is connected with drill bit (16) spline again, and shell (8) inner chamber is stepped; Distribution seat (6) centre bore is equipped with non retern valve (2), spring (3), and non retern valve (2) tip designs coning is equipped with dish spring group (4) between top connection (1) and the distribution seat (6), and dish spring group (4) adopts the superposed type combination; Inner casing (7) is installed in shell (8) inner chamber, the upper end is positioned the step of distribution seat (6), and the lower end is positioned the step of shell (8) inner chamber, and inner casing (7) external surface is symmetrically distributed with four roads and axially rises as high as the banks, be processed with gas communication hole (6a) radially in the groove, dress piston (9) in the inner casing (7); Drill bit (16) is processed with annular groove snap ring (13) is installed; Drill bit (16) cylindrical is provided with a circle gauge teeth; Be equipped with gasket seal (5) at inner casing (7) and distribution seat (6) fitting face, gasket seal (5) is made by the polytetrafluoroethylene (PTFE) rubber ring.
2, air hammer according to claim 1 is characterized in that: have 12 gas communication holes (6a) at distribution seat (6), distribution seat (6) foot piece surface has 5~10 road cannelures.
3, air hammer according to claim 1 is characterized in that: between shell (8) and lower contact (14) damping pad (12) is installed; Damping pad (15) down is installed between lower contact (14) and drill bit (16).
4, air hammer according to claim 1, it is characterized in that: at piston (9) centre bore afterbody and drill bit (16) centre bore top self compensation combination sealing assembly (11) is installed, self compensation combination sealing assembly (11) is made up of rubber sleeve (11a), spring (11b) and steel bushing (11c); The friction portion that is subjected to of rubber sleeve (11a) embeds spring (11b), and the bottom is not subjected to the friction portion diameter to be subjected to friction portion greater than top; The inner headed face of rubber sleeve (11a) and steel bushing (11c) carry out interference fit, and the outstanding step in steel bushing (11c) upper end is pressed in the upper surface of rubber sleeve (11a).
5, rubber sleeve according to claim 4 is characterized in that: rubber sleeve (11a) is selected for use can be high temperature resistant, the material of rub resistance, with polyimides PI or polyether-ether-ketone PEEK.
CNA2008100462433A 2008-10-07 2008-10-07 Long-life high performance air hammer CN101363305A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2008100462433A CN101363305A (en) 2008-10-07 2008-10-07 Long-life high performance air hammer

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Application Number Priority Date Filing Date Title
CNA2008100462433A CN101363305A (en) 2008-10-07 2008-10-07 Long-life high performance air hammer

Publications (1)

Publication Number Publication Date
CN101363305A true CN101363305A (en) 2009-02-11

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Family Applications (1)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101781969A (en) * 2010-03-12 2010-07-21 中国石油集团川庆钻探工程有限公司 Self-rotating air hammer
CN101798903A (en) * 2010-04-14 2010-08-11 长沙黑金刚实业有限公司 Large-aperture oil drilling impacter
CN103774998A (en) * 2012-10-18 2014-05-07 张卫星 Inner core opening device of inner-core-detachable drill bit for drilling
CN102686820B (en) * 2009-12-22 2014-10-01 印锡信 Air hammer for a boring machine
CN111236833A (en) * 2019-12-31 2020-06-05 山东天瑞重工有限公司 Hydraulic rock drill air-blast proof buffering system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102686820B (en) * 2009-12-22 2014-10-01 印锡信 Air hammer for a boring machine
CN101781969A (en) * 2010-03-12 2010-07-21 中国石油集团川庆钻探工程有限公司 Self-rotating air hammer
CN101798903A (en) * 2010-04-14 2010-08-11 长沙黑金刚实业有限公司 Large-aperture oil drilling impacter
CN103774998A (en) * 2012-10-18 2014-05-07 张卫星 Inner core opening device of inner-core-detachable drill bit for drilling
CN111236833A (en) * 2019-12-31 2020-06-05 山东天瑞重工有限公司 Hydraulic rock drill air-blast proof buffering system

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Open date: 20090211