wireline overshot tool in stock

The Hunting Releasable Overshot is designed to engage tools that have damaged or have no fish necks. The Overshot is designed to withstand high impacts associated with fishing operations.

The unique design of the core allows the reach to be altered to suit the required length without the need to carry extra cores. The quantity of slips has been minimised providing greater coverage of different tool OD’s.

Hunting Releasable Overshots are available in all common industry toolstring sizes and are manufactured with either sucker rod or integral quick connections as per customer requirements

The overshot is “planted” onto the fish to provide a new fish neck profile. This is then engaged with a standard releasable pulling tool or a Peak HD FRC pulling tool for heavy jarring applications.

In order to fish for wireline tools out of the hole, we must use different equipment than would be used for pipe recovery. Common wireline tool issues center around the cable being tangled or wadded in the hole, as well as the fact that attempts at fishing can pull the wireline out of the rope socket or part, further complicating tool retrieval.

As soon as a wireline assembly becomes stuck, the operator will need to determine whether the problem is in the cable or the tool. Usually, one would apply normal logging tension on the cable and allow it to sit for a few minutes. During this time, four things should be recorded:

The cable will be marked at the rotary table, and a T-bar clamp will also be securely fitted to the cable just above the table. Should the cable break, then the clamp holds on to the cable end at the surface, so that the whole cable does not fall down the hole and cause additional blockage. The operator will then need to apply 1000 lbf of tension on the cable, and make a note of the distance that the cable mark moves at the rotary table. This figure shows the stretch produced in the elastic cable. It is then possible to estimate the length of free cable, using a stretch chart or from prior knowledge of the cable’s stretch coefficient. Should the length of free cable be the same as the current logging depth, then the problem does not lie with the cable; rather, the tool is stuck, and not the cable. If the length of free cable is less than current logging depth, then the cable is stuck at some higher point in the hole.

If it is the tool which is stuck, and not the cable, then pulling on the cable will cause one of three results. The tool may come free, the weakpoint can break and the tool will remain in the hole but the cable can be removed, or the cable will break at the point of maximum tension.

When the cable cuts through mud cake, differential pressure sticking may occur. This is because one side of the cable is exposed to some degree of formation pressure, whereas the other is exposed to the hydrostatic mud column. Due to this significant difference in pressure, the cable will be pressed harshly into the formation, and friction against the formation stops the cable from moving any longer. Other reasons why sticking may occur include ledges, particularly severe doglegs, borehole caving, or the borehole becoming corkscrewed. As the length of the tool increases, as well as when there has been a long amount of time since the last conditioning trip, the chances of sticking will go up.

One option is a side-door overshot as shown in Figure 1. This method is similar to a regular overshot, except that it features a removable side door, so that the tool can be put together around the wireline at the well head itself. It is then possible to run the tool on some tubing or on the drillpipe, downhole alongside the wireline in order to make direct contact with the tool. This stops the wireline from being at risk of parting. It is not recommended that side-door overshots are used with deep open hole intervals. This is because it introduces the potential for keyseating, or differential sticking in the mud cake.

Throughout modern drilling, the most successful method to retrieve stuck logging tools is through the cut-and-thread method. This involves cutting the wireline at the surface, and then threading it through a pipe string while the pipe is lowered, until it engages with the logging tool. The line must be secured at the surface, and rope sockets need to be fitted to each end to form a spearhead both emerging from the top of the well, and a spearhead overshot at the logging end. A stand of pipe will then be hung in the derrick, allowing enough of an overshot at the bottom to catch the logging tool, or at least the wireline rope socket. When the upper end of the line is spooled down through the interior of the pipe until the overshot connects with the spearhead at the bottom, then the pipe will be run into the hole. This is repeated with additional stands until the bottom of the string is close enough to the fish. When this is achieved, the spearhead overshot can be disengaged and the overshot can be circulated clean, before it engages with the tool. When the fish has been grasped securely, the wireline will be pulled free from the rope socket, and then spooled out of the hole, and the tool itself recovered with the fishing string. Although the cut-and-thread method takes a lot of time, and comes with a certain amount of risk, it vastly improves the chances of recovering the wireline and tool fully, and is much quicker than trying to engage with the wireline in an open hole.

If it is not possible to use either a side-door overshot or a cut-and-thread, then an alternative is to break the weakpoint, and then recover the cable and use the drill pipe to fish for the logging tool. If tool recovery is not an option, then a last resort is to push it to the very bottom of the hole, and then plug it using cement.

Wirelines that are wadded or tangled can be retrieved with a wireline barb or rope spear. This penetrates the debris, engages with it, and then allows the debris to be pulled away, as shown in Figure 2. This is one of the most basic forms of fishing tool, and gives strong results when used in the right way.

Junk refers to any objects or debris which have been dropped into or lost in the hole. Junk can include all manner of things, from downhole tools and bottomhole assembly components, to bit cones, or even hand tools which have been accidentally dropped into the hole. In some cases, it may be clear what the junk is, such as when something has been visibly dropped down the hole. On the other hand, though, it may sometimes be unclear just what is causing the problem. While drilling is taking place, junk can be detected by an irregular torque, or by the drill being unable to move ahead when a new bit has been run. There are three main ways that junk can be dealt with; which method is chosen will depend on the size of the junk itself, and how hard the formation is. The junk can be recovered whole, split into smaller pieces so that these pieces can be recovered or that they are too small to cause any additional issues, or finally pushed into the side of a soft formation or the bottom of a formation with a large enough rathole. If none of these are possible and the junk continues to interfere with well operations, then the well made need to be sidetracked or abandoned.

The tools might penetrate the formation and cut a relatively short core, digging out debris from the bottom of the hole and then trapping it inside of an inner barrel.

Alternatively, tools can perform reverse circulation, leading to drilling fluid circulating around the exterior of the basket, and thereby sweeping junk into the top part of the tool before moving further up the annulus. It is also possible for these tools to cut small cores.

Magnets can be run either on a wireline or on a drill pipe. Smaller ones can pull around 2 lbf, while larger ones can pull up to 3000 lbf, equivalent to 13345 N. These magnets are designed to only exert their magnetic field downwards, so they do not cause any damage when they are lowered through casing. Permanent magnets will be run on a drill pipe, and include circulating ports to allow for cuttings to be washed away so that the magnet can make contact with metal fish. On the other hand, electromagnets are run on wirelines, and only switched on when they reach the fish. They can be run in and out of holes quickly, but a disadvantage is that they lack any fill-cleaning capabilities, and therefore cannot engage fish that are covered with debris or fill. They are useful for retrieving iron-containing metal objects.

DeGeare, J. (2003). The Guide to Oilwell Fishing Operations: Tools, Techniques, and Rules of Thumb (Gulf Drilling Guides). 1st ed. Houston: Gulf Professional Publishing.

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When you can’t reliably engage your fish with drillpipe, rely on the reliability and flexibility of fishing internal and external engagement tools from Baker Hughes.

Externally engage, pack off, and pull a fish with our wide range of overshot tools. The first fishing choice when screwing into the fish is not an option, our overshot tools are simply designed but ruggedly built. Choose from options including:

Kelo socket overshots are proven to catch small-diameter workstrings and sucker rods inside casing as well as recover coiled tubing that has parted and remains in hole.

The t-dog, mouse-trap, and flipper-dog (TMF) overshot can be dressed in three different ways for different washover applications. Deploy the t-dog assembly option to washover and recover mud-stuck or sanded-up square-collared pipe in one trip. Use the mouse-trap assembly to catch sucker rods, integral joint tubing, or cables. And with the flipper-dog assembly, you can confidently catch a fish with different ODs.

If your fish cannot be externally engaged, our range of releasable spears provide a viable retrieval option. These internal engagement tools come in a variety of designs, including:

Overshots are lifting devices used commonly in wire-line drill jobs. The overshot is dropped using a cable into the inner tube assembly where it lifts up the drill rods from the drill holes. Doing so eliminates the need to couple or uncouple rod strings each time the core needs retrieval.

overshots include spare parts of eye bolt, cable swivel collar, thrust bearing, castle nut, cotter pin, grease fitting, cable swivel body, jar staff, jar tube, hex nut 3/4 UNC, washer, nord lock, cap, ezy lock O/shot, spring, ezy lock O/shot, sleeve, ezy lock O/shot, compression spring, ball 11/32”, ezy lock overshot head, lifting dog, plain pin 1/2”*2-1/8”, spring pin 1/4”*2”, locking pin, set screw, 3/8 UNF*3/4 nyloc, locking sleeve.

One variation of the overshots is the continuous tubing model. This type of overshot is fitted with a grapple system that turns 340 degrees and is ideal for catching slick-wall fish. The overshot also provides circulation back to the fish while pulling out the drill rods. Circulation is restored by using a highly pressurized pack-off which is fitted above the overshot.

The second type of overshots is the hydraulic release model. This one is a bit more advanced and uses set-down weight and differential pressure to activate it mechanically. The overshot pumps fluids into the fish and tools below before latching onto them and pulling. This prior fluid injection washes away debris and any other particles from the surface of the fish making latching easy and the grip tighter. The set-down weight and differential pressure mechanism makes this overshot perfect for horizontal fishing projects.

Another popular overshot in drilling projects is the 150 Release overshot. It uses a huge bore with wire-line tools for fishing out parted drill pipes and their collars. The 150 Release overshots come in different strength levels for varied applications in drill sites. On the other hand, the 70 type overshots are used where the 150 release overshot is not applicable. The 70 type overshot is more accurate in pulling out drill rods that are a bit too narrow to be latched with the 150 overshot.

Two other overshots currently in the market today are the Type 10 and Type 20 overshot. The type 10 overshot is specially designed to retrieve tubular fish 2 inches in diameter. This same overshot can also be used for retrieving 1 5/8 inch drill rods as well, but on a much smaller 2 3/8 tube. The type overshot evenly distributes loads on tool and fish thanks to the internal helix construction that is tapered to provide a 360 degree wall contact. For the 20 Type overshot, this one comes in handy when the fish" top is too short for the 10 Type overshot to pull. The 20 Type grapple fastens to the bottom of the tool thus makes this overshot successful for most projects that use short-neck drill rods.

Technology continues to see newer inventions of the overshots being released to perform even more specific jobs with unparalleled accuracy. Other kinds of overshots you will find in the market include the Chinese Standard Wire-line overshot, HQ overshot, WLP overshot, NQ overshot and the WLH overshot.

Quick Connectsallow the connection of the tool string to be made when not able to rotate the full assembly. Primarily used when pressure deploying long BHAs.

Impact Toolsallow an amplification of up or down force downhole of what is applied by CT weight & at surface by the injector.Jarsfire a single burst of energy at 1 time and can be reset downhole.Impact Hammersfire multiple times utilizing both weight & pump rate.Intensifierscreate a larger more immediate transfer of energy to the Jar or Hammer and also serve as a re-coil shock absorber.

Nipple Locator or Tubing End Locator allows a profile in the wellbore to be identified by a slight indication on surface on the CT weight indicator. This is used when depth correlation is critical.Indexing Tools allow for the lower BHA to cycle 540 degrees which is used when a fish is leaning against the tubing wall or when entering a tight restriction.Bow Spring Centralizers are used to keep the BHA central in the wellbore. The have a high expansion when passing thru restrictions.Shifting Tools allow the engagement for a profile of a sliding sleeve in the completion. The sleeve can be moved in either direction the open or close position.