WO2012116460A1 - Sistema de flujo de fluido presurizado para un martillo de fondo de circulación normal y martillo con dicho sistema - Google Patents
Sistema de flujo de fluido presurizado para un martillo de fondo de circulación normal y martillo con dicho sistema Download PDFInfo
- Publication number
- WO2012116460A1 WO2012116460A1 PCT/CL2012/000009 CL2012000009W WO2012116460A1 WO 2012116460 A1 WO2012116460 A1 WO 2012116460A1 CL 2012000009 W CL2012000009 W CL 2012000009W WO 2012116460 A1 WO2012116460 A1 WO 2012116460A1
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- WIPO (PCT)
- Prior art keywords
- chamber
- pressurized fluid
- piston
- hammer
- discharge
- Prior art date
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/06—Down-hole impacting means, e.g. hammers
- E21B4/14—Fluid operated hammers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/36—Percussion drill bits
- E21B10/38—Percussion drill bits characterised by conduits or nozzles for drilling fluids
Definitions
- the present invention relates generally to pressurized fluid flow systems for percussive mechanisms operating with said fluid, particularly for bottom or DTH (Down The Hole) hammers, and more particularly for hammers bottom drilling of the normal circulation type, and for bottom hammers that use such systems.
- DTH Down The Hole
- the bottom hammer generally cylindrical, is used by mounting it on a drilling machine that is at surface level.
- the drilling machine also comprises an arrangement of bars mounted together, the upper end of this arrangement being mounted on a rotating and pushing head and its lower end coupled to the bottom hammer. Through this arrangement of bars the drilling machine supplies the hammer with the pressurized fluid necessary for its operation.
- the main moving part of the hammer is the piston.
- This piece of the hammer has a general cylindrical shape and is arranged coaxially and slidably inside a cylindrical outer shell.
- the piston performs an alternating movement due to the change in the pressure of the pressurized fluid contained within two main chambers, a front chamber and a rear chamber, formed inside the hammer and located at opposite ends of the piston.
- the piston has a front end in contact with the front chamber and a rear end in contact with the rear chamber and has external sliding surfaces, or sliding sections of the outer surface of the piston (as opposed to sections with sunken areas, grooves and holes), and surfaces internal sliders, or sliding sections of the internal surface of the piston (again unlike sections with sunken areas, grooves and holes).
- the external sliding surfaces are designed primarily to ensure the guidance and alignment of the piston inside the hammer. On the other hand, in most of the hammers these surfaces allow, together with the internal sliding surfaces of the piston, in cooperation with other elements as will be described later in this description, the control of the feed and alternate discharge of pressurized fluid to and from inside the front and rear cameras.
- the front part of the hammer that fulfills the function of drilling is called a drill bit, and is slidably arranged at the front end of the hammer, specifically on a chuck that is mounted on the front end of the external housing, in contact with the camera frontal and adapted to receive the impact of the front end of the piston.
- a part called a drill guide is normally used arranged inside the outer casing.
- the rotational movement provided by the drilling machine is transmitted to the drill by means of grooved surfaces both in the back of the drill (or fist) and in the chuck.
- the drill head larger in diameter than the outer casing, than the drill handle and the chuck, has the cutting elements that fulfill the drilling function and that extend forward from the front face of the drill bit
- the sliding of the drill is restricted in its travel backwards by the chuck and in its forward travel by a retaining element arranged especially for said purpose.
- a cylinder head which connects the hammer to the bar arrangement and at the end with the source of pressurized fluid.
- the rear end of the hammer is understood as the end where the cylinder head is located and the front end of the hammer is understood as the end where the drill bit is located.
- the process sequence for the front chamber and the rear chamber are [a -b (expansion) - c - b (compression) - a] and [c - b (compression) - a - b ( expansion) - c], respectively.
- the transition from one state to another is independent for each chamber and is controlled by the position of the piston with respect to other parts of the hammer in such a way that the piston acts in itself as a valve, as well as an impacting element.
- a first mode of operation when pressurized fluid is supplied to the hammer and the hammer is in an impact position, the piston immediately begins an alternating movement and in each cycle the drill is impacted by the piston, the front end of the drill thus fulfilling the function of drilling the rock at each impact.
- the rock fragments produced are evacuated to the surface by the action of pressurized fluid discharged to the bottom of the hole from the front and rear chambers.
- the magnitude of the pressurized fluid column with rock fragments also increases, thus generating greater resistance to the discharge of pressurized fluid from the chambers. This phenomenon negatively affects the drilling process. In some applications the filtration of water or other fluid into the hole further increases this resistance, and the operation of the hammer can stop.
- this mode of operation of the hammer can be complemented by an assisted sweeping system which allows to discharge part of the available flow in the source of pressurized fluid directly to the bottom of the hole without going through the hammer cycle.
- the assisted scanning system allows thorough cleaning of the hole while it is drilled.
- a second mode of operation of the hammer or "sweeping mode" the arrangement of bars and the hammer are lifted by the drilling machine so that the drill loses contact with the rock and all pressurized fluid is discharged through the hammer directly to the bottom of the hole for cleaning purposes without going through the hammer cycle, thus ceasing the alternating movement of the piston.
- the pressurized fluid from the assisted scanning system has an energy level substantially similar to that of the pressurized fluid discharged from the source of pressurized fluid, as opposed to what happens with the pressurized fluid discharged from the chambers, which is at a pressure substantially less product of the exchange of energy with the piston.
- This passage can be divided into two or more ducts that terminate on the front face of the drill, so that the discharge of pressurized fluid is generated mainly from the center and through the front face of the drill towards the peripheral region of this and towards the wall of the hole, and then towards the surface by the annular space formed between the hammer and the wall of the hole and between the bars and the wall of the hole.
- the rock fragments generated are evacuated by drag and are suspended in the pressurized fluid that is discharged to the bottom of the hole.
- Normally circulating hammers are used in mining in underground and open pit fields.
- the use of this type of hammers in the construction of oil, water and geothermal wells has also been extended, due to its ability to drill in rocks of medium to high hardness.
- the soil or rock removed is not used because they are not of interest and suffer contamination in its ascent to the surface.
- the drill bit or a cylindrical seal piece of the hammer that has a diameter substantially equal to that of the drill head and larger than the outer diameter of the outer shell, they fulfill the function of preventing the escape of pressurized fluid and rock fragments into the annular space formed between the hammer and the hole wall and between the bars and the hole wall (as in a normal hammer), forcing these fragments to move to the surface through of the sampling tube and arrangement of bars by the action of the pressurized fluid.
- the drill performs the sealing function, it has a perimeter zone that insulates the front face of the drill from said annular space.
- the parameters used to assess their usefulness and performance are the following: 1) penetration speed, given by the power generated in the cycle of the pressurized fluid in the hammer and whose value depends on two variables: the pressurized fluid consumption and the energy conversion efficiency of the cycle understood as power per mass unit of fluid pressurized consumed;
- pressurized fluid consumption which strongly depends on the dead volume of the front chamber, the dead volume of the rear chamber and the design of the pressurized fluid cycle in the hammer;
- Different pressurized fluid flow systems are used in the hammers for the process of filling the front chamber and the rear chamber with pressurized fluid and discharge of the pressurized fluid from them.
- a feeding chamber formed ' inside the hammer from which, and depending on the position of the piston, the pressurized fluid is directed to the front chamber or to the rear chamber.
- the piston acts as a valve, so that depending on the position in which it is located is the state in which the front chamber and the rear chamber are located, the possible states being those already indicated above: filling, expansion - compression and discharge.
- Type A Flow System represented by US4084646, US5944117 and US6135216
- the designs described in these patents have a jacket mounted inside the outer shell, which creates a flow passage between the outer surface of said jacket and the inner surface of the outer shell.
- This flow passage extends along the rear half of the piston and flows into the feed chamber, which is partially defined by the external sliding surface of the piston, near its midpoint, and the internal surface of the external housing .
- the presence of this shirt requires the use of a dual diameter piston, its diameter being larger at its front end and smaller at its rear end, where the shirt is located.
- the area where the external diameter of the piston changes that is, where there is a projection on the external sliding surface of the piston, is subject to an average pressure equal to the feed pressure of the hammer. Therefore, the net work done by this area on the piston in each cycle is zero, that is, it does not contribute to the process of transferring energy to the piston, resulting in a reduced rear thrust area.
- an air guide is available to control the discharge of the rear chamber, the air guide being a coaxial tubular part with the piston and the external housing and arranged on the rear face of the rear camera.
- this foot valve is a hollow tubular part coaxial with the piston and the external housing that emerges from the rear face of the drill, known as impact face.
- Type B Flow System represented by US5984021, US4312412 and US6454026
- the feed tube interacts with perforations and turning inside the piston.
- the control of the piston on the condition of the chambers is complemented by turning on the external sliding surface of the piston and turning on the internal surface of the external housing.
- the discharge of the front chamber is controlled by a foot valve in the drill (US5984021 and US4312412) or alternatively by a frontal area in the smaller diameter piston that interacts with a piston guide (US6454026).
- This latter solution can also be used as an alternative to the foot valve in the Type A flow system and in the other pressurized fluid flow systems described below.
- the hammers with the Type A flow system have a more robust piston and a simpler manufacturing process than the hammers with the Type B flow system.
- the generation of the feeding chamber inside of the feeding tube causes a delay in the establishment of the flow when the opening of the pressurized fluid feed to the chambers occurs, due to the distance between it and these.
- the perforations also result in an increase in the dead volume of the chambers, the main consequence of this being an increase in the consumption of pressurized fluid and a reduction in the efficiency of energy conversion in the thermodynamic cycle.
- the presence of the feeding tube forces the use of a piston that has a central perforation that extends along it, resulting in the power effects already mentioned for the Type A system.
- the design described in this patent has three different sets of feed ducts built into the wall of the external housing.
- the first set of ducts terminate on the inner surface of the outer shell and generate a feed chamber between the outer sliding surface of the piston and the inner surface of the outer shell.
- the second and third set of ducts allow the flow of pressurized fluid from the feed chamber to the front chamber and the rear chamber, respectively.
- the feeding chamber interacts with recesses in the external sliding surface of the piston and with the second and third set of ducts in the external housing to control the filling of the front chamber and the rear chamber, while the discharge of the front chamber and the rear chamber is controlled with the use of a foot valve and an air guide, respectively (refer to the Type A flow system applied to a normal circulation hammer).
- Type D Flow System represented by US5113950 and US5279371
- a feed chamber is generated at the rear end of the piston, these designs having similar characteristics to the Type A and Type B flow systems.
- the power system Type D flow uses a central feeding tube, but unlike that the feeding chamber does not form inside but, similar to the Type A flow system, the feeding chamber is created and acts on a portion of the rear end of the piston.
- the feeding tube fulfills the function of helping in the conduction of the pressurized fluid to the feeding chamber and does not participate in its formation. All of the above results in a reduction in the area of rear thrust of the piston.
- the need to unload the rear chamber forces the use of a piston with a central perforation that emerges on the front face of the same, thus reducing even more the rear thrust area and the frontal thrust area of the piston, which generates as result in a cycle of even less power.
- Type 1 Flow System represented by US5154244, RE36002 (US), US6702045 and US5685380 These patents describe a flow system where pressurized fluid is conducted from the rear end of the drill to the front end of the drill through cooperatively formed channels between machined grooves on the inner surface of the drill holder and machined grooves on the surface outside the drill handle, and with a ring or sleeve that acts as a seal element to generate closed passages in order to discharge the pressurized fluid to the peripheral area of the front end of the drill.
- a flow system is shown where the pressurized fluid is conducted from the rear end of the drill, to an intermediate point outside it, by means of channels formed in the outside of the drill These channels work cooperatively with the grooves of the chuck to generate closed passages. From this intermediate point the flow of pressurized fluid is diverted through perforations in the chuck to a passage generated between the outer surface of the chuck and the inner surface of the seal ring or jacket such that the pressurized fluid is discharged into the area peripheral of the front end of the drill.
- Type A and Type D From the point of view of the control of the status of the front camera and the rear camera, the commercial designs supported by these patents are Type A and Type D.
- a frontal area in the smaller diameter piston that interacts with a piston guide.
- the discharge of the rear chamber is controlled by means of an air guide which opens or obstructs the passage of air from the rear chamber to a coaxial central channel formed between the internal surface of the piston and the external surface of the sampling tube, this passage extending from the rear chamber to the rear end of the drill.
- the disadvantages of this flow system are the same associated with the Type A and Type D flow systems, and in particular it negatively affects the design of the drill in two aspects.
- the first is the need for multiple machining processes to generate the channels outside the drill which increases its manufacturing cost.
- the second is that due to the presence of these channels, the drag surface of the stretch marks, which depends on the contact area of each groove individually and the total number of grooves, may be insufficient in certain applications.
- This last problem can be compensated by lengthening the drill bit, but this implies increasing the cost of the hammer.
- Type 2 flow system represented by US5407021 and US4819746
- Patents US5407021 and US4819746 describe a flow system where pressurized fluid is conducted from the rear end of the drill, to an intermediate point on the outer surface of the drill, through channels formed cooperatively by machined grooves on the inner surface of the chuck and machined grooves on the outer surface of the drill handle. From this intermediate point the flow of pressurized fluid is diverted through mainly longitudinal perforations created in the drill head so as to discharge the pressurized fluid in the peripheral area of the front end of the drill.
- the drill head additionally performs the function of preventing the escape of pressurized fluid through the annular space formed between the hammer and the hole wall and between the bars and the hole wall.
- the discharge of the rear chamber is controlled by means of an air guide (US4819746) which opens or obstructs the flow of pressurized fluid from the rear chamber to a coaxial central channel formed between the internal sliding surface of the piston and the external surface of the sampling tube, which extends to the rear end of the drill.
- an air guide (US4819746) which opens or obstructs the flow of pressurized fluid from the rear chamber to a coaxial central channel formed between the internal sliding surface of the piston and the external surface of the sampling tube, which extends to the rear end of the drill.
- This third aspect is given by the mechanical weakness induced in the drill product of perforations, mainly longitudinal, created in the head of the drill to channel the pressurized fluid and discharge it in the peripheral area of the front end of the drill, to from the periphery of This generates a flow of pressurized fluid through the front face of the drill into the coaxial central duct of the hammer and bars.
- a further objective of the invention is to obtain a reverse circulation hammer with a greater drilling capacity in depth without a noticeable reduction in penetration speed or in the resilience of rock fragments.
- pressurized fluid flow system of the invention incorporates an assisted scanning system. In this way the depth drilling capacity is achieved.
- the drill has been designed such that the conventional central passage at the rear end of the drill and the two or more passages that converge to this central passage used in normal circulation hammers have been replaced by one or more passages of swept through the drill bit, extending from the cooperatively formed channels between the grooves in the chuck and in the drill's fist to the front face of the drill.
- the pressurized fluid discharge configuration of the invention resembles the Type 1 and Type 2 flow systems in the section of the bit of the drill and henceforth follows a different path to the face of the bit.
- the design provides only a single sliding surface for the piston, thus preventing the failure of this component due to thermal cracks induced by friction between the piston and misaligned parts (air guide, feed tube, foot valve, etc. ).
- the pressurized fluid flow system of the invention is distinguished by having a jacket coaxially disposed between the outer shell and the piston; and two chambers, a feeding chamber and a discharge chamber, delimited by the outer surface of the jacket and the inner surface of the outer shell, and separated by a dividing wall.
- the feed chamber is permanently filled with fluid from the source of pressurized fluid and communicated without interruption with the discharge of said source.
- the discharge chamber that is permanently communicated with the bottom of the hole pierced by the hammer.
- the feed chamber is arranged in series longitudinally with the discharge chamber and both chambers are defined by two recesses on the inner surface of the outer shell.
- first and second means of fluid conduction in the piston and multiple through holes are provided. feed and discharge in the jacket, in which these through-feed and discharge holes face the feed and discharge chambers, respectively.
- the state of the front camera and the rear camera are controlled by the interaction of a single pair of components, compared to the prior art where control is achieved with a larger number of components interacting together.
- the preceding configuration allows optimal use of the cross-sectional area of the hammer purchased with known hammers.
- the sectional area of the hammer is mainly shared by the piston, the outer shell, the sampling tube and fluid flow areas pressurized reserved for the filling of the front chamber and the rear chamber and pressurized fluid flow areas for the discharge of the front chamber and the rear chamber.
- the feeding chamber in series longitudinally with the discharge chamber, it is possible to increase the front thrust area and the rear thrust area of the piston due to the fact that they share the sectional area only with the area occupied by the Discharge chamber and feed chamber, respectively.
- the front thrust area and the rear thrust area of the piston are equal or almost equal in magnitude under the configuration of the invention. Additionally, the control of the discharge of the front chamber and the rear chamber by interaction between the piston and the sleeve, makes it possible to dispense with the use of the foot valve or of a frontal area in the piston of smaller diameter that interacts with a piston guide or an air guide for these purposes, thus avoiding additional losses in the thrust areas as with the prior art flow systems.
- one or more scanning channels can be disposed in the dividing wall to allow part of the available pressurized fluid flow from the power source to be discharged directly to the bottom of the hole to thereby form an assisted scanning system and achieve the desired greater depth drilling capacity without a substantial reduction in penetration speed.
- Said channels are preferably longitudinal channels, more preferably propellers and in a preferred embodiment of the invention the scanning channels are interlocked with slots for mounting them in removable fluid seals which, when mounted in the slots, deactivate the assisted scanning system. .
- a discharge chamber contiguous to the inner surface of the outer shell allows the flow of pressurized fluid that exits the discharge chamber to the outside of the drill fist to be diverted.
- the flow of pressurized fluid is then discharged from these channels to the front end of the drill through one or more sweeping passages pierced through the body of the drill, which extend from said channels to the front face of the drill. This allows you to configure a simpler and more robust drill design for a normal circulation hammer.
- each sweeping passage can be divided into a plurality of secondary sweeping passages before reaching the front face of the drill.
- the normal circulation hammer of the invention is characterized by having the pressurized fluid flow system and the pressurized fluid discharge configuration outside the drill bit described above.
- Figure 1 represents a longitudinal sectional view of a normal circulation hammer according to the invention, specifically showing the piston arrangement with respect to the outer casing, sleeve and drill bit when the front chamber is being fed with pressurized fluid and the rear chamber is discharging pressurized fluid to the bottom of the hole.
- Figure 2 represents a longitudinal sectional view of a normal circulation hammer according to the invention, specifically showing the piston arrangement with respect to the outer casing, sleeve and drill bit when the rear chamber is being fed with pressurized fluid and the front chamber is discharging pressurized fluid to the bottom of the hole.
- Figure 3 represents a longitudinal sectional view of a normal circulation hammer according to the invention, specifically showing the arrangement of the piston and the drill with respect to the outer casing and the sleeve when the hammer is in sweeping mode.
- the hammer flow system has also been shown in relation to the solution designed in the invention to bring the pressurized fluid from the front chamber and the rear chamber to the bottom of the hole, in all modes of operation and states; specifically to the front end of the drill, for the evacuation of rock fragments.
- the direction and direction of the pressurized fluid flow has been indicated.
- a normal circulating DTH hammer comprising the following main components:
- an external cylindrical housing (1) with a rear end and a front end;
- a piston (60) arranged in a sliding and coaxial manner inside said outer casing (1) and capable of moving alternately due to the change in the pressure of the pressurized fluid contained within a front chamber (240) and a rear chamber (230), located at opposite ends of the piston (60), the piston (60) having multiple external sliding surfaces (64); Y
- a drill (90) arranged in a sliding manner in the chuck (110), where the sliding movement of the drill (90) is limited by the drill retainer (210) and the support face of the drill (111) of the drill ( 110); and where the drill (90) comprises a fist (95) at its rear end and a head (96) at its front end, the head of the drill (96) being larger in diameter than the fist (95) having a front face (99); the drill handle (95) having an outer surface (98) with grooves (93) machined thereon; channels (97) cooperatively formed between the grooves (112) on the inner surface (113) of the chuck (110) and the grooves (93) on the outer surface (98) of the drill handle (95).
- the pressurized fluid flow system of the invention includes a jacket (40) arranged coaxially between the outer housing (1) and the piston (60).
- the rear chamber (230) of the hammer is defined by the cylinder head (20), the sleeve (40) and the rear thrust area (62) of the piston (60).
- the volume of this chamber is variable and depends on the position of the piston (60).
- the front chamber (240) of the hammer is defined by the drill bit (90), the sleeve (40), the drill guide (150) and the front thrust area (63) of the piston (60).
- the volume of this last chamber is variable and also depends on the position of the piston (60).
- the external housing (1) has two chambers defined by respective recesses on its internal surface, a feed chamber (2) for supplying pressurized fluid to the front chamber (240) and the rear chamber (230), and a discharge chamber ( 3) to discharge pressurized fluid from the front chamber (240) and the rear chamber (230); both chambers are internally delimited by the shirt (40) and separated by a dividing wall (5).
- a feed chamber (2) for supplying pressurized fluid to the front chamber (240) and the rear chamber (230)
- a discharge chamber ( 3) to discharge pressurized fluid from the front chamber (240) and the rear chamber (230); both chambers are internally delimited by the shirt (40) and separated by a dividing wall (5).
- One or more scanning channels (6) are provided in said dividing wall (5), to allow a direct flow of pressurized fluid from the feed chamber (2) to the discharge chamber (3) such that part of the flow Pressurized fluid available from the source of pressurized fluid can be discharged directly to the bottom of the hole, thereby generating an assisted scanning system.
- the partition wall (5) has annular holder slots (7) with removable fluid seals (170) mounted thereon. These annular grooves (7) are interlocked with said scanning channels (6) and the seals of fluid (170) block the direct flow of pressurized fluid from the feed chamber (2) to the discharge chamber (3), thereby disabling the assisted scanning system. The removal of such fluid seals (170) enables the assisted scanning system.
- the jacket (40) has multiple through feed openings (41, 42) and multiple through discharge openings (43) in front of the feed and discharge chambers (2, 3), respectively.
- the piston (60) has fluid conduction means (66, 67, 80, 81) that allow the flow of pressurized fluid from the cylinder head (20) to the feed chamber (2), from the feed chamber (2) towards the front camera (240) or the rear camera (230) and from the front camera (240) or the rear camera (230) towards the discharge chamber (3).
- the impact face (61) of the piston (60) When in the hammer cycle, the impact face (61) of the piston (60) is in contact with the impact face (91) of the drill bit (90) and the drill bit (90) is at the rearmost point of its path, that is, when the hammer is in an impact position (see Figure 1), the front chamber (240) is in direct fluid communication with the feed chamber (2) through the front set of through-opening openings. feed (42) of the jacket (40); the rear set of radial feed passages (67) of the piston (60) and through one or more central axial feed passages (80) formed in the piston (60). As illustrated, the one or more central axial feed passages (80) are fluidly connected to the set of feed conduits (67). In this way, the pressurized fluid can flow freely from the feed chamber (2) to the front chamber (240) and initiate the recoil movement of the piston (60).
- the front chamber (240) of the hammer will be fluidly communicated with the discharge chamber (3) through the frontal reduction (81) of the piston (60) and through the assembly of through discharge openings (43) of the jacket (40) (see Figure 2).
- the pressurized fluid contained in the front chamber (240) will be discharged into the discharge chamber (3) and from this chamber can flow freely out of the hammer through the channels (97) formed cooperatively between the grooves (93) of the drill handle (95) and the grooves (112) of the chuck (110) and through the sweeping passages (92) of the drill (90) to the front face (99) of the drill (90).
- the drill bit (90) is aligned with the external casing (1) of the hammer by a drill guide (150) having discharge slots (151) as shown in the figures.
- the discharge slots connect the discharge chamber (3) with the channels (97), such that the discharge of pressurized fluid flows through these discharge slots (151) and then reaches the channels (97 ) and subsequently flows through the sweeping passages (92) of the drill (90).
- the invention is not limited to the use of a drill guide and it is possible to use alternative alignment solutions with corresponding pressurized fluid discharge means.
- the impact face (61) of the piston (60) When in the hammer cycle, the impact face (61) of the piston (60) is in contact with the impact face (91) of the drill bit (90) and the drill bit (90) is at the rearmost point of its path, that is, when the hammer is in an impact position (see Figure 1), the rear chamber (230) is in direct fluid communication with the discharge chamber (3) through bifunctional longitudinal passages (66 ) extending through the piston body (60), from the rear thrust area (62) to the external sliding surfaces (64) of the piston (60), and through the set of through discharge openings (43) of the jacket (40).
- the pressurized fluid contained inside the rear chamber (230) can be discharged into the discharge chamber (3), and from the discharge chamber (3) can flow out of the hammer to the front face ( 99) of the drill bit (90) in a similar manner as the pressurized fluid is discharged from the front chamber (240).
- the rear chamber (230) of the hammer By continuing the movement of the piston (60), the rear chamber (230) of the hammer will be fluidly communicated with the feed chamber (2) through the front set of through feed openings (42) of the jacket (40) and through of the bifunctional longitudinal passages (66) of the piston (60). In this way the rear chamber (230) will be supplied with pressurized fluid from the feed chamber (2). Scan mode operation
- the drill bit (90) will reach the front end of its travel then passing the hammer to operate in its scanning mode.
- the pressurized fluid is conducted directly to the front end of the drill bit (90) through the following route: into the feed chamber (2) through the cylinder head (20) and the rear set of through feed openings (41) of the jacket (40); and from the feed chamber (2) to the discharge chamber (3) through the front set of feed through openings (42) of the sleeve (40), through the bifunctional longitudinal passages (66) of the piston ( 60), and through the set of through discharge openings (43) of the jacket (40). From the discharge chamber (3) the pressurized fluid can flow freely out of the hammer to the front face (99) of the drill bit (90) in a similar way as the pressurized fluid is discharged from the rear and front chambers (230, 240).
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MX2013009979A MX2013009979A (es) | 2011-03-03 | 2012-03-02 | Sistema de flujode fluido presurizado para martillo de fondo de circulacion normal y martillo que comprende el sistema. |
BR112013022428A BR112013022428A2 (pt) | 2011-03-03 | 2012-03-02 | sistema de fluxo de fluido pressurizado para um martelo de fundo de circulação normal e martelo que compreende o dito sistema |
KR1020137023192A KR101848117B1 (ko) | 2011-03-03 | 2012-03-02 | 정상순환 천공 해머를 위한 가압된 유체 유동 시스템 및 이러한 시스템을 포함하는 해머 |
EA201300993A EA201300993A1 (ru) | 2011-03-03 | 2012-03-02 | Проточная система нагнетаемой текучей среды для скважинного ударника с прямой промывкой и ударник, содержащий такую систему |
CN201280018529.5A CN103534433B (zh) | 2011-03-03 | 2012-03-02 | 用于正常循环井下锤的加压流体流动系统及包括该系统的锤 |
CA2828790A CA2828790A1 (en) | 2011-03-03 | 2012-03-02 | Pressurised fluid flow system for a normal-circulation down-the-hole hammer and hammer comprising said system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/039,543 | 2011-03-03 | ||
US13/039,543 US8640794B2 (en) | 2008-01-28 | 2011-03-03 | Pressurized fluid flow system for a normal circulation hammer and hammer thereof |
Publications (2)
Publication Number | Publication Date |
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WO2012116460A1 true WO2012116460A1 (es) | 2012-09-07 |
WO2012116460A4 WO2012116460A4 (es) | 2012-11-15 |
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PCT/CL2012/000009 WO2012116460A1 (es) | 2011-03-03 | 2012-03-02 | Sistema de flujo de fluido presurizado para un martillo de fondo de circulación normal y martillo con dicho sistema |
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US (1) | US8640794B2 (es) |
KR (1) | KR101848117B1 (es) |
CN (1) | CN103534433B (es) |
BR (1) | BR112013022428A2 (es) |
CA (1) | CA2828790A1 (es) |
EA (1) | EA201300993A1 (es) |
MX (1) | MX2013009979A (es) |
WO (1) | WO2012116460A1 (es) |
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US11933143B1 (en) * | 2022-11-22 | 2024-03-19 | Jaime Andres AROS | Pressurized fluid flow system for percussive mechanisms |
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- 2012-03-02 MX MX2013009979A patent/MX2013009979A/es active IP Right Grant
- 2012-03-02 CN CN201280018529.5A patent/CN103534433B/zh active Active
- 2012-03-02 KR KR1020137023192A patent/KR101848117B1/ko active IP Right Grant
- 2012-03-02 BR BR112013022428A patent/BR112013022428A2/pt not_active IP Right Cessation
- 2012-03-02 WO PCT/CL2012/000009 patent/WO2012116460A1/es active Application Filing
- 2012-03-02 CA CA2828790A patent/CA2828790A1/en not_active Abandoned
- 2012-03-02 EA EA201300993A patent/EA201300993A1/ru unknown
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US20090188723A1 (en) * | 2008-01-28 | 2009-07-30 | Aros Jaime Andres | Pressurized fluid flow system for a reverse circulation hammer |
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Also Published As
Publication number | Publication date |
---|---|
US20110209919A1 (en) | 2011-09-01 |
CA2828790A1 (en) | 2012-09-07 |
US8640794B2 (en) | 2014-02-04 |
MX2013009979A (es) | 2014-02-27 |
KR101848117B1 (ko) | 2018-05-28 |
BR112013022428A2 (pt) | 2019-09-24 |
WO2012116460A4 (es) | 2012-11-15 |
EA201300993A1 (ru) | 2014-01-30 |
CN103534433B (zh) | 2016-05-04 |
CN103534433A (zh) | 2014-01-22 |
KR20140056152A (ko) | 2014-05-09 |
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