workover rig components free sample
Download Workover & Drilling Rig Inspection Checklist As we mentioned in the Rig Audit Article, rig inspection is an important process that shall be done from time to time. Especially, after the rig moving to a new drilling location.
Are you looking for a more convenient way to conduct inspections of drill rigs and drilling equipment? This easy to use app for drilling rigs and drilling rig components makes it easy to complete inspections from anywhere. Simply open a new inspection checklist form using your smartphone or tablet, and you"ll be prompted to inspect the drilling equipment and drill rigs before they are used in the field.
The checklist covers the important safety considerations for land drilling rigs, including checking the drill bit, drill rod, drilling fluid and drill collars for wear and tear and inspecting the drill pipe for erosion. With the app, any drilling company or individual who offers drilling services can quickly and easily perform inspections and save them electronically for their records.
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A pit in the ground to provide additional height between the rig floor and the well head to accommodate the installation of blowout preventers, ratholes, mouseholes, and so forth. It also collects drainage water and other fluids for disposal.†
A small enclosure on the rig floor used as an office for the driller or as a storehouse for small objects. Also, any small building used as an office or for storage.†
The hoisting mechanism on a drilling rig. It is essentially a large winch that spools off or takes in the drilling line and thus raises or lowers the drill stem and bit.†
On diesel electric rigs, powerful diesel engines drive large electric generators. The generators produce electricity that flows through cables to electric switches and control equipment enclosed in a control cabinet or panel. Electricity is fed to electric motors via the panel.†
Shallow bores under the rig floor, usually lined with pipe, in which joints of drill pipe are temporarily suspended for later connection to the drill string.†
A diesel, Liquefied Petroleum Gas (LPG), natural gas, or gasoline engine, along with a mechanical transmission and generator for producing power for the drilling rig. Newer rigs use electric generators to power electric motors on the other parts of the rig.†
A hole in the rig floor 30 to 35 feet deep, lined with casing that projects above the floor. The kelly is placed in the rathole when hoisting operations are in progress.†
Shallow bores under the rig floor, usually lined with pipe, in which joints of drill pipe are temporarily suspended for later connection to the drill string.†
The hose on a rotary drilling rig that conducts the drilling fluid from the mud pump and standpipe to the swivel and kelly; also called the mud hose or the kelly hose.†
The top drive rotates the drill string end bit without the use of a kelly and rotary table. The top drive is operated from a control console on the rig floor.†
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Drill floor (#21) is the area on the rig where the tools are located to make the connections of the drill pipe, bottom hole assembly, tools and bit. It is considered the main area where work is performed.
Setback (#17) is a part of the drill floor (#21) where the stands of drill pipe are stood upright. It is typically made of a metal frame structure with large wooden beams situated within it. The wood helps to protect the end of the drill pipe.
Stand (#16) is a section of 2 or 3 joints of drill pipe connected and stood upright in the derrick. When they are pulled out of the hole, instead of laying down each joint of drill pipe, 2 or 3 joints are left connected and stood in the derrick to save time.
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The present application is a utility conversion of provisional patent application Ser. No. 61/126,011 filed 30 Apr. 2008, for Mobile Hydraulic Workover Rig, by Troy A. Rogers and herein incorporated by reference.
The following relates to workover and drilling rigs, and more particularly relates to a novel and improved method and apparatus adaptable for use in the servicing and treatment of oil or gas wells.
An important consideration in the design and construction of workover rigs in the servicing and treatment of wells is the ability to move efficiently between wells which are located a short distance from one another, such as, for example, wells in a cluster or in one or more rows in directional drilling operations.
In the past, workover rigs have been so constructed and arranged that the derrick and its substructure must be disassembled to move between each well. It has also been proposed to utilize skids without disassembling the structure but has required some disassembly of the derrick and is undesirable from a number of standpoints including but not limited to the time and cost of installation each time that the rig has to be moved; and in the past such installation has involved the utilization of cables or guidewires anchored in the ground to stabilize the derrick.
Accordingly, there is a need for a portable workover rig which does not require cables or guidewires to support or anchor the derrick and to provide for a derrick and substructure which is completely hydraulic and can be advanced on skids between wellheads without pivoting or disassembling the derrick or other parts of the rig and can be utilized on land as well as off-shore. Further, it is desirable to construct the derrick in such a way as to facilitate mechanical side-loading and unloading of pipe from and to raised pipe rack sections at the base of the derrick without necessity of threading or loading manually upward and downward through the base of the derrick.
It is therefore an object to provide for a novel and improved rig which is conformable for use in servicing wells which are located on land or offshore in a reliable and efficient manner.
Another object is to provide for a novel and improved portable workover rig which is completely fluid-actuated, is extremely stable and does not require the use of guidewires or cables to anchor to the ground.
A further object is to provide for a novel and improved workover rig which includes a hollow base structure containing the necessary pumps and reservoirs for hydraulic actuation while at the same time greatly stabilizing the entire structure; and further wherein the entire rig including the derrick and base structure can be advanced between wells without disassembly of any of the rig structure.
In a first embodiment, as shown in FIGS. 1 to 25, a workover rig 10 is broadly comprised of a derrick 12 mounted on a work floor 13 above a base structure made up of one or more housings 14 adapted to be mounted on elongated skids or guideways 16. The guideways 16 are arranged in pairs to flank one or more rows of wellheads represented at W in FIGS. 1 and 5. As a setting for the embodiment shown, the wellheads W may be for gas wells in which directional drilling has enabled the wellheads W to be spaced very short distances apart, such as, on the order of 3 to 6 feet. Fluid-actuated, double-acting cylinders 18 are mounted behind the base structure housings 14 on each pair of skids 16 for the purpose of advancing the rig 10 along the row or rows of wellheads W. Standard snub cylinders S are also positioned on the work floor 13 and hydraulically controlled through a main control panel to be hereinafter described.
FIG. 13 illustrates the catwalk 48 and grating spacer assembly mounted on the base structure as represented by the rectangular housing members 14. In addition to the crossbeams 46 referred to earlier, upper beams 49 extend along the entire length of the base structure and securely anchor the upper work floor 13 hereinabove described to the housing members 14. In the embodiment herein shown, the housing members 14 are made up of large shipping containers on the order of 8 feet wide by 20 feet long. As shown in FIGS. 5 to 10, the shipping containers 14 are of elongated, rectangular configuration and each pair is mounted in end-to-end relation to one another with a grade bolt 50 between adjoining ends of the beams 49 to interconnect each pair of containers 14 into flush, aligned relation to one another. The skids 16 are firmly anchored in the ground in spaced parallel relation to one another and each pair of skids 16 extends beneath the inboard and outboard undersurfaces of the containers 14, as best seen from FIG. 8. Further, each pair of skids 16 is rigidly interconnected by crosstube members 17 at spaced intervals along the entire length of the skids 16.
In order to advance the housing members or containers 14 along the skids 16, as shown in FIGS. 6, 7 and 10, low-friction shoes 58 each include an upper guide plate or rod 59 inserted into a recess 60 in the undersurface of the front and rear corner of each of the housing members 14 so that the entire weight of the housing members 14 is applied through the slide members 58 to the skids 16. Low-friction plastic insert plates 61, as best seen from FIG. 10, are positioned between each shoe and skid to enable the entire rig to slide easily along the guideways or skids 16 with a minimum of friction. A double-acting cylinder 62 includes a piston rod 63 bearing against a stop 64 which is adjustably positioned on the skid by an adjustment bolt 66, and the opposite end of the cylinder 62 is affixed to a pusher 66 in direct proximity to and behind one of the corner slides 58. The stops 64 are inserted into one of a series of adjustment openings 65 along the length of each skid 16 and spaced apart a distance corresponding to the maximum length of extension of the cylinder. When fluid under pressure is applied in a direction causing extension of the cylinder 62 away from the stop 64, the housing members 14 will be advanced a distance corresponding to the axial movement of the cylinder 62, bearing in mind that the four cylinders 62 will be activated in unison behind the housing members to advance them along the skids 16. Also, the housing members 14 will be advanced incrementally by successively advancing and retracting the cylinders 62 and moving the stops 64 and 66 to the next adjustment opening 65.
There is shown for the purpose of illustration but not limitation in FIGS. 20 to 25 a hydraulic control circuit for operation of the rig and its accessories beginning with one form of lift cylinder in FIG. 20 and continuing with the various controls and control panels in FIGS. 21 to 25 forming part of the hydraulic control circuit. In FIG. 20, the lift cylinder 20 has its lower end mounted on the top plate 38 of the derrick 12 with the piston rod 92 extending downwardly through the notch 40 in the top plate of the derrick. The cylinder is double-acting with flow lines 93 and 94 extending between a lower directional control box 95 via lower ports 96 and upper ports 97 into the upper end of the cylinder. The lower end of the piston rod 92 is notched at 98 for suspension of a standard, hydraulically-actuated elevator 99, as illustrated in FIG. 1. FIG. 21 schematically illustrates a flow control valve 101 for the lift cylinder 20, the valve 102 for a standard rotary table control mounted over the slide plates 21 and 44, and pressure relief valves 104 for the lift cylinder 20, rotary table, snub cylinders S and the conventional upper and lower slips on the work basket. A four-bank control represented at 105 operates the slips and pusher cylinders 62 on the derrick. FIG. 22 merely illustrates the various pressure gauges on the panel as designated at 106 for the lift cylinder 20, snub cylinders S, slips and rotary table. In addition, a pump gauge 107 is provided for the pump from the reservoir and a weight gauge 108 is provided for sensing the weight of the pipe string.
FIG. 25 illustrates the engine, gear box and hydraulic pumps including a dual stage pump 120 to operate the main lift cylinder 20, a three-stage pump 122 for the blow-out preventers, catwalk and tongs, another dual stage pump 124 for the elevators E, rotary drive table and lift cylinder 20, and a dual stage pump 126 for the snub cylinders S and lift cylinder 20. A flywheel and shaft 128 are mounted on the gear box 130 of the engine 132. The engine, for example, may be a Detroit 8V92 575 horsepower (Detroit Diesel, Detroit, Mich.), and utilizes a three-stage commercial gear pump with three relief valves. The gear box may be a Durst PH 9 (Durst, Shopiere, Wis.). In addition, although not shown, a series of Denison vane pumps (Parker Hannifin HPD, Marysville, Ohio) are provided off of the engine together with 3000 psi relief valves. Another feature of the invention is that the complete engine power pack may be stored in one of the containers 14, the pumps housed in another container 14, the reservoir or tank in one of the containers 14, and the remaining container 14 being utilized as a tool house. In this way, the various engine, pump, and control components will contribute to the weight necessary to stabilize the entire rig and establish a low center of gravity to more than counterbalance the weight of the derrick 12, pipe sections P and lift cylinder 20.
After each well workover operation is completed, the pusher cylinders are activated to advance the rig along the guideways 16 until the center bore 44 is alongside or aligned with the next wellhead to be serviced. The hydraulic control circuit for the pusher cylinders is represented in FIG. 7 and includes a two-bank control 132 in order to simultaneously activate the cylinders 62 behind the containers 14. The cylinders 62 are push-pull cylinders to advanced the entire base structure in either direction along the guideways. A pair of handle controls, not shown, may be mounted on the end of the one of the containers 14 to control the flow of fluid from one of the pumps referred to in FIG. 25 to activate the cylinders 62 as referred to earlier. If necessary, the derrick slide plate is activated to adjust the derrick laterally into alignment over the well to be serviced.
An offshore drilling 10′ is illustrated in FIG. 26 wherein like parts are correspondingly enumerated with prime numerals. Again, the rig 10′ is made up of a derrick 12′ mounted on base housing members or containers, not shown, which can be affixed or mounted on the standard offshore drilling platform, not shown, and therefore can utilize the existing positioning controls on the drilling platform to advance the derrick into position for the workover operation. The work floor 13′ has the same components including the catwalk, grating spacers, and pipe racks as described in the first embodiment.