CN85202386U - Automatic-drilling hydraulic shock absorber - Google Patents
Automatic-drilling hydraulic shock absorber Download PDFInfo
- Publication number
- CN85202386U CN85202386U CN 85202386 CN85202386U CN85202386U CN 85202386 U CN85202386 U CN 85202386U CN 85202386 CN85202386 CN 85202386 CN 85202386 U CN85202386 U CN 85202386U CN 85202386 U CN85202386 U CN 85202386U
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- China
- Prior art keywords
- piston
- drilling
- fluid cylinder
- piston rod
- expansion link
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Abstract
The utility model relates to an automatic-drilling hydraulic shock absorber, which is a downhole tool used for petroleum well drilling and is composed of mutually superposed multi-stage pistons, the travel ranges of which are approximately more than 0.4 m, and a liquor cylinder machine. The sum of the pushing forces which every stage piston bears under the pressure-drop of a bit nozzle is a drilling pressure. The automatic feed in the travel ranges of the pistons is realized under the pushing forces, and every stage of the piston or liquor cylinder is a shock absorption component. A driller can work without holding a brake handle during normal drilling process, and the bit can stably penetrate; thus, the mechanical drilling rate and the well body quality are increased, and the life time of the drill are extended.
Description
The present invention is a kind of downhole tool that is used for oil drilling.
There is a kind of hydraulic damper can slow down the drilling tool vibrations at present both at home and abroad, the protection drill bit.As " oil drilling and r eoovery machine " 1983, № 1, hydraulic damper 10 described in the 10th page " differential drilling tool damper ", mainly form by a long urceolus and multi-level piston, every grade of piston and urceolus (fluid cylinder) form one with drill string in the isolated low pressure chamber of drilling fluid, low pressure chamber by damping hole and drill string outward borehole wall annular space communicate.Piston strokes at different levels are extremely short, only can when drill bit, drilling tool axial vibrations, do upper and lower reciprocating motion passively, drilling fluid in this motion compressing and the suction drill string, kinetic energy+heat energy conversion weakens shock energy by the elasticity absorption of liquid and the mechanical energy---pressure energy---of bit nozzle and damping hole.The drilling tool on damper top and the drill bit of its underpart be by the spline pair in the damper connect, transfer torque, splined shaft only can transmit axial vibrations, and can not make the sufficiently long stroke of drill bit active propulsion and realize automatic bit feed.This damper only is used for the drilling tool damping and does not have other function.The drill string on damper top is sent to synchronously with drill bit substantially during work, that is to say that the driller is not all the time from brake lever.Like this, manually send brill inhomogeneous, the pressure of the drill is less stable also.Though bit life increases to some extent, rate of penetration does not have obvious raising.
The objective of the invention is on the basis of former fluid power damper shock-absorbing function, development automatic bit feed function, further steady the pressure of the drill improves rate of penetration, and is used for unfreezing temporarily.
The present invention is mainly superimposed by several grades, and the piston head (10), piston rod (11), fluid cylinder (12) mechanism and the stroke that have greater than 0.4 meter stroke are formed greater than 0.4 meter expansion link (1), extending cylinder (7).Piston head (10) and piston rod (11) are referred to as piston.With pitch 3～8 teeth/inch, the non-standard drilling rod of tapering 1:4～1:32 is buckled and is connected and sealing between each fluid cylinder (12).Piston rod (11) hollow can be led to mud.For the ease of salvaging, be integral by screw thread, pin or Bolt Connection between each piston rod.Piston is originally made (11) two of piston heads (10), piston rod part in addition respectively, saves material and also is convenient to change consumable accessory piston head (10).All by rubber seal (4), (8) sealing of Y type or other pattern, the cavity that forms between the three (14) is a low pressure chamber for piston head and fluid cylinder (12), piston rod and fluid cylinder.A piston head (10) also is housed on the expansion link (1), and expansion link and extending cylinder (7) are with spline or from all directions, six sides match, and both the moment of torsion of upper drilling string passed to drill bit, but guarantee the relative top axially-movable of drill bit LAP again.Expansion link (1) stroke of extending cylinder (7) slip relatively should be selected between 0.4～2 meter, also can be longer, for the automatic bit feed hydraulic damper that the well of 8 1/2 inch is used, generally select 0.7～1.5 meter.When being used for the sea, consider heaving of the sea heave effect, optional 1 meter～2.5 meters of stroke.The stroke of the relative fluid cylinder of piston and expansion link stroke should be basic equating usually.Low pressure chamber (14) communicates by the damping hole on the damping screw (3) with borehole wall shape is empty.Every grade of fluid cylinder (12) is gone up the damping hole gross area and is about 1～2% of this grade piston head (10) effective active area.Fluid cylinder of the present invention (12) is formed an independently installation unit with piston head (10) and piston rod (11), and the intensive treatment and the installation and maintenance that utilize fluid cylinder inside are arranged.Fluid cylinder (12) is gone up the pin thread design on the external diameter of fluid cylinder (12) and piston rod (11) cooperation place, and fluid cylinder (12) aperture minimum has guaranteed tube wall strength herein.Between piston head (10) endoporus and the piston rod (11) be 7～11 grades movingly, fitting face dress O RunddichtringO (17) sealing.Piston head (10) is fixed on piston rod (11) by nut (5) or jump ring.Expansion link (1) external surface, extending cylinder (7) inner surface, fluid cylinder (12) inner surface, piston rod (11) external surface quench, and plating high strength chromium, wear-resisting, corrosion protection.Extending cylinder (7) is adorned an endoporus and the identical mud-scraping ring (2) of expansion link surface configuration towards borehole wall annular space opening part, prevents that sand grains, landwaste from entering.High pressure chest (15) and low pressure chamber are communicated with by being contained in hole minimum on the alloy flooding nozzle on the piston rod or on the piston head; can make sub-fraction slurry flows mistake; silt in the flushing low pressure chamber (14); protection fluid cylinder (12) and piston rod (11) and piston head (10), the flooding nozzle tight fit is bumped into piston rod (11) or piston head (10).Be stamped stainless (steel) wire or other net on the hole of damping screw (9), stop landwaste to enter low pressure chamber.Joint (13) on the fluid cylinder (12) of the expansion link (1) and the other end links to each other with drill bit and upper drilling string by API standard drilling rod button respectively.Also can turn this instrument around use in case of necessity, also can not influence its function.The automatic bit feed hydraulic damper that is used for different hole diameters, the external diameter of fluid cylinder (12) is different, this external diameter should with near the drill collar diameter of drill bit about equally.As the desirable 168～85mm of 8 1/2 inch wells, fluid cylinder (12) wall thickness should be greater than 13mm.The progression of piston is mainly determined according to the pressure of the drill, hole diameter, pump capacity etc.Recommend: 6 inch wells, get 4～5 grades; 8 1/2 inch are got 3～4 grades; 9 5/8 inch～12 1/4 inch are got 2～3 grades.
When the automatic bit feed hydraulic damper is gone into well work, the pressure drop △ P that mud forms at bit nozzle promptly is the pressure differential between high pressure chest (15) and the low pressure chamber (14), the effective active area of this pressure differential and piston head (10) and piston rod (11) (area of the area of piston head (10) and piston rod (11) poor) △ P is amass be the suffered hydraulic coupling of this grade piston head and piston rod with joint efforts.Omit frictional resistance, then the suffered thrust (the pressure of the drill) of drill bit is T=△ P(△ S
1+ △ S
2+ △ S
3+ ...).The suffered sum of thrust to another way of fluid cylinders at different levels also is T=△ P(△ S
1+ △ S
2+ △ S
3+ ...) equate with the power of piston rod transmission.Wherein expansion link upper piston head (10) effective active area should be the whole topped area of whole piston head.Under the pressure of the drill that this fluid power causes, drill bit can creep under the situation that this upper tool part drilling tool does not feed downwards automatically.
Hydraulic damper more originally, substantive characteristics of the present invention are that piston rod (11), expansion link (1) are one section longer strokes of active propulsion under mud pressure, rather than only are forced to vibration owing to drill bit shakes.
About 0.5～1.5 meter/hour of general hard formation rate of penetration if tool stroke is 1 meter, has then been beaten a stroke and has been needed 30～90 minutes approximately, drill bit automatic bit feed during this, the driller must not hold up brake lever, has not only alleviated labour intensity greatly, and has reduced the possibility of the generation of accidents such as drilling string not well braked.After adding this instrument, most of drilling time upper drilling string is only rotated not feeding, has eliminated on the weight indicator because the error that the borehole wall and master bushing cause the drilling tool resistance, what reflected is the actual bottom hole WOB value, centripetal force on the drill bit is constant, send and bores evenly, has improved rate of penetration.Test for several times shows that rate of penetration has all improved more than 20%.Send brill stably another direct result be the raising of wellbore quality.After adding this instrument, though upper drilling string suffered on the hydraulic coupling and the pressure of the drill equivalence that push away, wherein the application point of a part of power has improved the bending status of bottom drill collar by moving on the drill collar hydrophthalmia.In marine drilling, offshore boring island rises and fall on the waves bigger, causes harmful lifting of drilling tool.This instrument has shaft bottom heave compensation effect, has cushioned the damage of upper drilling string lifting to drill bit greatly.During circuitous card, movable expansion link causes the drill string jarring, and this instrument is used as releasing tool temporarily.More than effect all is that other hydraulic damper does not have except damping, protection drilling tool.
Only " use " pressure drop of bit nozzle during this tool work, its energy loss is not equal to △ PQ/7.5, only is a very little part among the total flow Q because participate in to the drilling tool work done.Angle from the simple mechanical merit, rate of penetration is generally per hour 1 meter, expansion link stroke each second is extremely short, under 18T the pressure of the drill, this moment, the power that consumed was: N=(1800 * 1)/(3600 * 75)=0.067 horsepower, than be inappreciable in bit HHP (number+to hundreds of horsepower).
In the accompanying drawing: 1, expansion link, 2, mud-scraping ring, 3, pore, 4, rubber seal, 5, nut, 6, pin, 7, extending cylinder, 8, rubber seal, 9, the damping screw, 10, piston head, 11, piston rod, 12, fluid cylinder, 14, low pressure chamber, 15, high pressure chest, 16, pore, 17, sealing ring.
The pressure of the drill can be according to the desired parameter area adjustment of drilling engineering before drilling tool enters well, the scope of requirement is at first fallen according to nozzle exit pressure, remove the effective active area that required the pressure of the drill is piston with this Pressure Drop △ P, determine progression according to the single stage piston effective active area then. Lead to then the accurate gross area inverse △ P under this progression, and under desired discharge capacity, determine at last a water spray eye area. The driller also can change pumpage slightly by adjusting diesel engine throttle after entering well, transfers the pressure of the drill. During operation drilling tool transferred to this instrument expansion link (1) and close up state (drill bit is the end of at), check brake lever and hanged the top drilling tool, start rotating disk and pump, the drill bit automatic feed. Cover the gradually backswing of weight indicator pointer to the contracting throw of lever. Speed is transferred that drilling tool to expansion link holds together or is approached and closes up then, begins second stroke.
Claims (5)
1, a kind of automatic bit feed hydraulic damper of forming by fluid cylinder and several grades of pistons and expansion link, extending cylinder (7), it is characterized in that the relative fluid cylinder of said piston (12) has the haul distance greater than 0.4 meter, the said relatively extending cylinder of said expansion link (1) (7) has the haul distance greater than 0.4 meter.
2, according to the said automatic bit feed hydraulic damper of claim 1, it is characterized in that said piston by (11) two of piston heads (10), piston rod in addition parts form.
3, according to claim 1,2 described automatic bit feed hydraulic dampers, it is characterized in that said fluid cylinder (12) has several, fluid cylinder (12) is gone up near the external diameter fluid cylinder (12) internal diameter and the piston rod portion place of matching pin thread.
4,, it is characterized in that being with on the said expansion link (1) mud-scraping ring (2) according to claim 1,2 described automatic bit feed hydraulic dampers.
5, according to claim 1,2 described automatic bit feed hydraulic dampers, it is logical less than φ 3 one pores and low pressure chamber to it is characterized in that said piston rod (11) has upward been located diameter near said piston head (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85202386 CN85202386U (en) | 1985-06-07 | 1985-06-07 | Automatic-drilling hydraulic shock absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85202386 CN85202386U (en) | 1985-06-07 | 1985-06-07 | Automatic-drilling hydraulic shock absorber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85202386U true CN85202386U (en) | 1986-05-21 |
Family
ID=4798208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85202386 Ceased CN85202386U (en) | 1985-06-07 | 1985-06-07 | Automatic-drilling hydraulic shock absorber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85202386U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106968612A (en) * | 2017-03-07 | 2017-07-21 | 中国石油天然气集团公司 | Circumferential shock absorbing tool and method |
| CN117905395A (en) * | 2024-03-19 | 2024-04-19 | 中石化西南石油工程有限公司 | Multistage adjustable compensation expansion joint for test and use method thereof |
-
1985
- 1985-06-07 CN CN 85202386 patent/CN85202386U/en not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106968612A (en) * | 2017-03-07 | 2017-07-21 | 中国石油天然气集团公司 | Circumferential shock absorbing tool and method |
| CN117905395A (en) * | 2024-03-19 | 2024-04-19 | 中石化西南石油工程有限公司 | Multistage adjustable compensation expansion joint for test and use method thereof |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CE01 | Termination of patent right |