slickline overshot 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.

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.

Incrementally sized grapples can be selected to suit the outside diameter of the fish whilst the adjustable core feature of the Overshot can be altered to suit the reach required to engage the fish. Due to the interchangeable nature between the LiMAR® Releasable and Non-Releasable Overshot versions, the top sub can also be removed and fitted with a releasable type top sub for both running and retrieval.

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.

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.

Leveraging the high-strength pulling power of a heavy-duty wireline fishing unit, our skilled wireline fishing teams can quickly retrieve virtually any fish in any wellbore environment. With more than 25 years of experience, our specialized teams arrive with an array of equipment―including power-assisted jars and heavy-duty pulling tools, releasable spears, and releasable overshots―that minimize downtime for your well.

I debated on where to go next, but at the end of the day the most widely used fishing tool has to be an overshot. Some will say why not a spear? Well if you must ask, always go with the strongest fishing tool you can run to catch the fish. And if you run a spear, never plug the I.D. of your fish by breaking it off. Done with that!

The info that follows has been taken from the manuals published on overshots. I realize that paper manuals are a thing of the past, yes, yes at one time fishing tool hands carried massive catalog brief cases full of reference material. Now you have the luxury of your laptop loaded with information. If you have never sat down and read an overshot manual, now might be a good time.

The overshot is highly versatile and efficient tool. There are several different types of overshots, however each overshot is designed to engage a specific size of tubing, pipe, coupling, tool joint, drill collar or smooth OD tool.

The original overshot was developed by Bowen Oil Tools, which is now part of NOV. One thing I will point out is that in the catalogs you will see more than one assembly number for a given OD of Overshot, this came about due to the two locations developing their own variations. I found this information on NOV’s website and thought it was interesting to share.

Bowen™ became a leader in innovation with the creation of the first overshot, the Series 150, in 1935. This tool set the standard for fishing equipment, and the quick acceptance of the tool assured the company partners that their business would be successful. The company continued to create new products, building a reputation for their well tool design and construction.

Currently there are several manufacturers of overshots, NOV (Bowen), Rubicon (Logan) and Applied Oil Tools (Gotco). These overshots are designated by a series number as follows:Series 10 - Sucker Rod Overshot

Overshots may be identified by one of the following, known as “type”:Full Strength (FS) - engineered to withstand all pulling, jarring and torsional strain

The basic overshot (from top down) consists of a top sub, a bowl, grapple, control, and a guide. In addition to the basic components, some overshots (Series 10 and 150) can be dressed with either a:Spiral grapple used if the fish diameter is near the maximum catch of the overshot, or a

The Series 150 Overshot features the ability to packoff on the fish. When the circulating packoff is not used, the fluid circulates down the drillpipe, aroundthe top outside of the fish, through the slip or grapple assembly, around the guide shoe and up the annulus.

When the circulating packoff is used, the annular space between the top outside of the fish and the inside of the lower part of the overshot is packed off, diverting the fluid flow down into the fish, making it easier to release and recover the fish. Packoffs usually are not high pressure devices but will often withstand sufficient pressure to establish circulation through the fish. Third party high pressure packoffs are available from various sources.

The extension can be installed between the top sub and the bowl of the Series 10, 70, and 150 overshots. It is used to extend the overshot bowl to:Allow the grapple to catch farther down on a fish that may be necked down at the top by having been pulled in two, or latched by an overshot and released several times, or to

A stop ring must be used where a fish OD reduces immediately below the catch area to allow the grapple to bite on full-size pipe.Example - catching a Hydril upset or EUE collar. If the upset of collar should pass completely through the grapple, the overshot may not be releasable.

The Series 10 Sucker Rod Overshot is designed to engage and recover sucker rods, couplings, and similar items from inside tubing strings.Basket grapples are recommended for fishing for hardened and ground boxes (Sucker Rod Box).

The Series 20 Sucker Rod Overshot is a short catch tool which provides a means for engaging the exposed portion of a fish too short to be engaged with a Series 10 overshot.Uses basket grapples only

The Series 70 Short Catch Overshot is designed to engage the exposed portion of a fish too short to engage with Series 150 overshots.Uses basket grapple only

The Series 150 Releasing and Circulating Overshot is used to engage, packoff, and retrieve twisted-off lost tubing, drillpipecoupling, tool joint, casing or other similar fish.

A right hand wicker grapple converts a normal right release overshot to left hand release. This grapple is used where you expect to apply excessive right hand torque to release a packer, safety joint, etc. Note: Overshot will have to be released by left hand rotation.

High Pressure Packoff Assemblies:The High Pressure Packoff Assembly is an accessory to the Series 150 Overshots. It is used when high pressure circulation to the fish is required. It consists of a packoff sub with packing and packing rings and is installed between the top sub and bowl of the overshot. By running the packoff sub above the bowl, this design prevents the application of high internal pressures to the overshot bowl. The design of the High Pressure Packoff Assembly allows pressures two to three times the standard overshot packoff to be applied to the fish.

This information comes directly from the NOV manual for the Wide Catch Overshot. This is probably the first and only change to this common tool I know of in my career.

The Wide Catch Overshot provides the strongest tool available to externally engage, pack-off, and pull a fish that has been significantly worn. This tool has similar rugged design features and construction as the industry standard, Bowen Series 150 overshot, with the ability to interchange the Bottom Guide with the full range of existing components used with the standard Bowen Series 150 overshot.

In service, the Wide Catch Overshot (WCOS) takes a positive grip over a large area of fish and is capable of withstanding heavy pulling, torsion, and jarring strains without damage to the tools or the fish.

The WCOS has been designed to significantly increase the catch range of the OD of the fish to be caught, compared to the standard overshot. This enables a greater opportunity for a successful fishing operation in a reduced number of trips, thus reducing overall intervention costs for the operator. In addition to the large catch range, the WCOS has the ability to seal across very large extrusion gaps at both standard and high pressure and provide full circulation through the fish, should it be required.

Connections between the Top Sub/Bowl and Extension Sub have been designed to create a seal. This will prevent the connection from washing out should the overshot be required to be flowed through for a long period of time. In order to lock the Top Sub/Extension Sub to the Bowl from backing off during operation, set screws have become standard and will gall the threads should the connection break free.

The operation of all overshots is identical. The exception being that the Series 150 carries a packoff which provides circulation through the fish. First, determine that the overshot is properly assembled and dressed with the proper size grapple. Make up the overshot on the fishing string (normally it is run connected to the bottom of the bumper sub) and run it into the well. As the top of the fish is reached make sure circulation has been established to clear overshot ID of any plugging. Lower the overshot onto the top of the fish with no rotation at first. A 5,000 pound set down weight will be sufficient to engage the grapple. While lowering the overshot over the top of the fish watch for pressure build up, shut off pumps if any pressure build up is noticed. Should any back pressure be noticed, release the back pressure to allow the grapple to engage the fish. By elevating the string it can be determined, if the grapple went over and engaged the fish. If unable to work overshot over top of fish without rotation, then slowly rotate the fishing string to the right and gradually lower the overshot over the fish. Combined rotation and lowering over top of the fish are important to keep the grapple in the release position. This provides the maximum clearance between the grapple and fish. While lowering the overshot over the top of the fish, watch for torque build up and an increase in pump pressure. A pump pressure build up indicates the overshot has gone over the top of the fish thereby reducing the flow area. Stop rotation (continued rotation could dull the wickers of the grapple) enabling the grapple to set. Allow the right hand torque to slack out of the string and then pull on the string by elevating the string to set the grapple.

To release from the fish, bump down, then simultaneously rotate to the right and slowly elevate the fishing string. It is best to have a clean fishing top before running the overshot.

Overshot is a necessary device in wireline drilling. It"s dropped on a cable and directly couples onto and lift up the inner tube assembly, eliminating the need to couple and uncouple the rod string each time the core is retrieved.

Ezy Lock Overshot is a modified product based on compact overshot. It protects against accidental release of the core barrel. This is ideal for suface application when hoisting above ground. Q series overhshot are available in A, B, N, H and P size.

As a professional manufacturer of BQ NQ HQ PQ SQ series overshot assembly in China, we still provide customers worldwide with China overshot assembly, hoisting plug, foot clamp, circle wrench, etc.

1. Drill rod: BQ NQ HQ PQ SQ and AW, BW, NW, HW, BTW, NTWCasing tube: BW, NW, HW, HWT2. Core barrel: BQ NQ HQ PQ & head assembly and core barrel assembly3. BQ NQ HQ PQ , BTW, NTW, HTW etc. Diamond core bit, reaming shell & shoe bit (Imp. and surface-set, PDC) , oversize supplied4. Drill tool: hoisting plug, water swivel, overshot, outer tube & inner tube wrench, foot clamp,etc.