US3877680A - Cylinder synchronizer for drilling equipment - Google Patents
Cylinder synchronizer for drilling equipment Download PDFInfo
- Publication number
- US3877680A US3877680A US402145A US40214573A US3877680A US 3877680 A US3877680 A US 3877680A US 402145 A US402145 A US 402145A US 40214573 A US40214573 A US 40214573A US 3877680 A US3877680 A US 3877680A
- Authority
- US
- United States
- Prior art keywords
- hook
- pair
- main frame
- frame
- cylinders
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 13
- 239000012530 fluid Substances 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 244000145845 chattering Species 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/02—Rod or cable suspensions
Definitions
- a cylinder synchronizer is especially useful in drilling equipment having a main frame.
- a hook frame is mounted to rise and fall along a vertical center line relative to the main frame under the influence of a pair of vertically disposed, hydraulically interconnected cylinders.
- the plungers of the cylinders are each provided with one of a pair of pulleys over which flexible straps extend.
- One end of each strap is connected to the main frame while the other end of each strap passes over a respective one of the pulleys and at its other end is connected by connecting pins to one of a pair of spaced, selected points on the hook frame.
- the selected points are on opposite sides of the center of the hook frame and are at about the same elevation.
- On the hook frame is a hook support connected at a point substantially midway between the selected points and disposed at an elevation lower than that of the selected points.
- a further object of the invention is to provide a cylinder synchronizer that utilizes a pair of cylinders each exerting substantially the same lifting load on the material being handled and occupying the same travel positions despite free hydraulic interconnection between the cylinders.
- a further object of the invention is to provide a cylinder synchronizer that will maintain cylinder plungers approximately in the same horizontal point in the vertical path location when subjected to a joint vertical load, despite hydraulic interconnection of the cylinders.
- Another object of the invention is in general to provide an improved cylinder synchronizer.
- a still further object of the invention is in general to provide an improved arrangement of hydraulic mechanism in drilling or other hoisting equipment.
- FIG. 1 is in part a diagram showing important portions of a cylinder synchronizer constructed in accordance with the invention and incorporated in a drilling device;
- FIG. 2 is a diagram illustrating terms, forces, moments and positions involved in the mechanism of FIG. 1 and its explanation.
- the cylinder synchronizer pursuant to the invention is incorporated in hoisting or drilling equipment.
- This includes a supporting structure 6 carried by any suitable arrangement at an appropriate elevation from the ground or from the water.
- a main frame 7 Connected to the holding mechanism 6 is a main frame 7 symmetrical about a vertical center line 8.
- the main frame 7 includes on one side a first hydraulic cylinder 9 and on the other side, about equally spaced from the center line, includes a comparable, second hydraulic cylinder 11.
- the cylinders are appropriately connected to the usual hydraulic mechanism so that the cylinders can be filled and emptied under control and the cylinders are hydraulically interconnected through a cross duct 12 so that there is relatively free hydraulic interflow therebetween.
- each of the cylinders is also provided with a pneumatic chamber 13 interconnected therewith.
- a pneumatic chamber 13 is shown only on the left cylinder 9 in FIG. 1 in order to improve the clarity of the showing, although a comparable chamber is usually afforded for the cylinder 11.
- first plunger 14 Adapted to reciprocate vertically in the cylinder 9 is a first plunger 14 and arranged similarly to reciprocate vertically within the second cylinder 11 is a second plunger 16.
- the plungers are preferably about the same bore as the cylinders and project from the upper end therefrom. It is equally feasible to provide pistons in each of the cylinders connected by relatively smaller piston rods to the outside. In any event, the vertically movable members extend upwardly from the cylinders 9 and 11.
- the plunger 14 at its upper end carries a pulley 17 rotatable about a journal pin 18 on the plunger center line, while similarly the plunger 16 carries a pulley l9 connected'thereto by a journal pin 21 disposed on the center line.
- a flexible strap 23 Fastened to the main frame 7 at one end by a securing device 22, preferably adjustable, is a flexible strap 23 conveniently a length of multiple chain having considerable flexibility with respect to the curvature of the pulley 17 and effective to act as a multiplier for the motion of the plunger 14.
- a second, flexible strap 24 at one end connected to the main frame by an adjustable connector 26 and running over the pulley 19.
- the strap 23 has a relatively long, vertically extending flexible portion 27, whereas the strap 24 has a relatively long, vertically extending portion 28.
- both of the straps are secured to a hook frame 31.
- This is a body disposed generally symmetrically with respect to the center line 8 and provided with a connector 32 for receiving a hook 33 or equivalent hoisting device.
- the lower end of the strap 23 is secured to the hook frame 31 at one side of the center line 8 by means of a pivot pin 34 so that there may be relative rotary motion between the lower end of the flexible strap and one side of the hook frame.
- the other strap 24 adjacent its lower end is connected by a pivot pin 36 to the hook frame 31.
- the pins 34 and 36 are preferably disposed about equidistantly from the center line 8 on opposite sides thereof and are located at about the same elevation or in the same horizontal plane.
- the connector 32 is preferably located about on the center line 8 midway between the pins 34 and 36 but at an elevation substantially lower than that of the pins 34 and 36.
- the center line 8 is represented by a solid line L while the connecting points of the hook frame 31 are generally represented by an isosceles triangle defined by three apices, the upper lefthand one of which is designated point 1 and corresponds with the axis of the first pin 34.
- the triangle has a second apex at point 2 corresponding to the center line of the second pin 36.
- the third apex, point 3 is representative of the hook connector 32 and is generally on the center line at a substantially lower elevation than the common horizontal elevation points 1 and 2 occupy.
- the hook frame 31 is a relatively heavy, symmetrical body, the center of gravity of which is disposed at point 4 on the center line L (or 8) at an elevation between that of the points 1 and 2 and that of the point 4.
- the effect of the arrangement, as shown in FIG. 1, is that if one of the plungers moves higher, for example,
- the hook frame 31 twists slightly changing the moments in a direction to restore the synchronization. This operation can be analyzed pursuant to the foregoing values in accordance with the following analysis.
- R The angle of hook frame rotation due to unbalanced forces F, The force exerted by the first plunger (at point F The force exerted by the second plunger (at point 2) DP The force difference between F, and F W, The reaction load due to F, and F B The horizontal distance between points 1 and 2 A The horizontal distance from point 2 (force F to the vertical center line L (8) H The height of the triangle W,- The force exerted by the weight of the hook frame C The vertical distance from the base line (plane of point 2) to the center of gravity of the hook frame (point 4) X, The horizontal distance from point 2 to point 1 due to rotation of frame B cos R X, The horizontal distance from point 2 to point 3 due to rotation of frame A cos R H sin R X, The horizontal distance from point 2 to point 4 due to rotation of frame A cos R C sin R Y, The vertical displacement of point 1 with respect to point 2 B sin R DX, The horizontal displacement of point 1 due to rotation of the frame X, A DX,, The horizontal displacement of point
- a cylinder synchronizer for drilling equipment comprising a main frame, means for pendulously suspending said mainframe, a hook frame, a pair of fluid motor cylinders mounted on said main frame with means for equalizing fluid pressures therein, a pair of plungers each reciprocably mounted in a respective one of said cylinders and extending upwardly there from, a pair of pulleys each rotatably mounted at the upper end of a respective one of said plungers, a pair of flexible straps each secured at one end to said main frame then passing over a respective one of said pulleys and at the other end disposed adjacent said hook frame, a pair of pivot pins each connecting said other ends of said straps to said hook frame at selected laterally spaced points on opposite sides of said hook frame for supporting a hook at a support point substantially midway between said selected points and at an elevation lower than that of said selected points.
- a cylinder synchronizer for drilling equipment comprising a main frame, means for pendulously suspending said main frame, a hook frame having a vertical center line, a pair of interconnected hydraulic motor cylinders mounted on said main frame, a pair of plungers each reciprocably mounted in a respective one of said cylinders, a pair of flexible straps each having a portion extending substantially vertically from said main frame, means for moving each of said portions relative to said main frame in accordance with reciprocation of a respective one of said plungers, means for articulating each of said straps to a respective one of two selected points on said hook frame disposed on opposite sides of said center line at approximately the same elevation, and means on said hook frame for supporting a hook at a support point on said center line and at an elevation lower than that of said selected points.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
Description
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US402145A US3877680A (en) | 1973-10-01 | 1973-10-01 | Cylinder synchronizer for drilling equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US402145A US3877680A (en) | 1973-10-01 | 1973-10-01 | Cylinder synchronizer for drilling equipment |
Publications (1)
Publication Number | Publication Date |
---|---|
US3877680A true US3877680A (en) | 1975-04-15 |
Family
ID=23590717
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US402145A Expired - Lifetime US3877680A (en) | 1973-10-01 | 1973-10-01 | Cylinder synchronizer for drilling equipment |
Country Status (1)
Country | Link |
---|---|
US (1) | US3877680A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4027854A (en) * | 1975-10-15 | 1977-06-07 | Mounton Jr William J | Self-equalizing linkage for well derricks |
US4341373A (en) * | 1977-05-25 | 1982-07-27 | Mouton Jr William J | Hydraulic well derrick with cable lifts |
US4501219A (en) * | 1983-04-04 | 1985-02-26 | Nl Industries, Inc. | Tensioner apparatus with emergency limit means |
US4620692A (en) * | 1984-10-31 | 1986-11-04 | Nl Industries, Inc. | Crown block compensator |
US4688764A (en) * | 1984-10-31 | 1987-08-25 | Nl Industries, Inc. | Crown block compensator |
US4759256A (en) * | 1984-04-16 | 1988-07-26 | Nl Industries, Inc. | Tensioner recoil control apparatus |
US4867418A (en) * | 1986-03-03 | 1989-09-19 | N.L. Industries, Inc. | Apparatus for increasing the load handling capability of support and manipulating equipment |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US464786A (en) * | 1891-12-08 | Hoisting mechanism | ||
US1379378A (en) * | 1917-08-15 | 1921-05-24 | Zastrow Machine Company Inc | Crane |
US2240794A (en) * | 1940-03-11 | 1941-05-06 | Mason John Conley | Drilling lift |
US2786361A (en) * | 1953-01-09 | 1957-03-26 | English Electric Co Ltd | Gimbal mechanisms |
US3355993A (en) * | 1965-11-17 | 1967-12-05 | Soule Steel Company | Drive balancing apparatus |
-
1973
- 1973-10-01 US US402145A patent/US3877680A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US464786A (en) * | 1891-12-08 | Hoisting mechanism | ||
US1379378A (en) * | 1917-08-15 | 1921-05-24 | Zastrow Machine Company Inc | Crane |
US2240794A (en) * | 1940-03-11 | 1941-05-06 | Mason John Conley | Drilling lift |
US2786361A (en) * | 1953-01-09 | 1957-03-26 | English Electric Co Ltd | Gimbal mechanisms |
US3355993A (en) * | 1965-11-17 | 1967-12-05 | Soule Steel Company | Drive balancing apparatus |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4027854A (en) * | 1975-10-15 | 1977-06-07 | Mounton Jr William J | Self-equalizing linkage for well derricks |
US4341373A (en) * | 1977-05-25 | 1982-07-27 | Mouton Jr William J | Hydraulic well derrick with cable lifts |
US4501219A (en) * | 1983-04-04 | 1985-02-26 | Nl Industries, Inc. | Tensioner apparatus with emergency limit means |
US4759256A (en) * | 1984-04-16 | 1988-07-26 | Nl Industries, Inc. | Tensioner recoil control apparatus |
US4620692A (en) * | 1984-10-31 | 1986-11-04 | Nl Industries, Inc. | Crown block compensator |
US4688764A (en) * | 1984-10-31 | 1987-08-25 | Nl Industries, Inc. | Crown block compensator |
US4867418A (en) * | 1986-03-03 | 1989-09-19 | N.L. Industries, Inc. | Apparatus for increasing the load handling capability of support and manipulating equipment |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: BAROID TECHNOLOGY, INC., 3000 NORTH SAM HOUSTON PA Free format text: ASSIGNS THE ENTIRE INTEREST, SUBJECT TO LICENSE;ASSIGNOR:RUCKER COMPANY, THE;REEL/FRAME:005023/0909 Effective date: 19890210 |
|
AS | Assignment |
Owner name: CHASE MANHATTAN BANK (NATIONAL ASSOCIATION), THE Free format text: SECURITY INTEREST;ASSIGNOR:BAROID CORPORATION, A CORP. OF DE.;REEL/FRAME:005196/0501 Effective date: 19881222 |
|
AS | Assignment |
Owner name: BAROID CORPORATION, TEXAS Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CHASE MANHATTAN BANK, THE;REEL/FRAME:006085/0590 Effective date: 19911021 |
|
AS | Assignment |
Owner name: VARCO SHAFFER, INC., TEXAS Free format text: ASSIGNS THE ENTIRE RIGHT, TITLE AND INTEREST. SUBJECT TO LICENSE RECITED.;ASSIGNOR:BAROID TECHNOLOGY, INC.;REEL/FRAME:006308/0956 Effective date: 19920716 |