wireline overshot tool made in china

Overshot is one of the necessary equipment for wireline drilling which could be put into the hole. This fishing tool is used to connect with the inner tube assembly and lift it up. Overshot is attached to drill rod and lowered over the pipe or stuck in the borehole. Hardened and self-cutting threads inside overshot firmly grasp the pipe, allowing the fish (such as inner tube and core) to be pulled from the hole.

5.The rotary overshot is a non-releasable tool and should normally be run below a safety joint in order to have positive release mechanism from the fish.

CDG’S overshot is an external catch fishing tool designed to catch the inner tube and core from the hole. Once the inner tube of a wireline core barrel is full of core sample, overshot is released from the top. Wireline overshot assembly slides inside the wireline drill rods and locks the spear head of core barrel. Along with inner tube, it is pulled out with steel wire rope.

China Drilling Geological Equipment Ltd. is a professional manufacturer of drilling tools. Main products cover impregnated synthetic diamond core bits, surface-set diamond bits, PDC core and noncoring bits, rod shoes & casing shoes, reaming shells, drill rods, core barrels, fishing tools (like overshots or wireline overshot assembly), water swivels, hoisting plugs, casing cutter assembly, adapter subs, wrenches, recovery tools and foot clamps. 80% of our products are sold abroad.

The Q series overshot assembly is a kind of tool specially used to salvage and place inner tube assembly. At present, we have four kinds of Q series overshot assembly: BQB, NQB, HQB and PQB.

Its main components are salvage frame and salvage hook. Regarding those to be exported, the Q series overshot assembly will be packed by export-standard plywood boxes.

A wide variety of overshot fishing tools options are available to you, such as swivel, fishing plier and spool.You can also choose from ocean boat fishing, lake and river overshot fishing tools,

Our tungsten carbide products mainly include tungsten carbide cutting blades and tungsten carbide geological mining cutting tools. And these tungsten carbide tools are widely used in a wide range of fields, like cutting, geological drilling, petroleum, coal mining, and construction industry....

Core barrel is a complex tool, technically, it is an assembly drilling tool, which is one part of the machinery. It is always used for drilling the hole that are extra hard, like mineral formation. ROSCHEN company offers three types, including the triple tube core barrels, double tube and singe tube core barrels, The sizes are among 1.5 to 3 meters. The core barrel always is used to take the mineral and rock samples.Wireline diamond core bits, metricl diamond impregnated drill bits specifications

We focus on manufacturing Drill Rods, Casings, Core barrels, Diamond bits, Reaming shells, Drill rigs, PDC bits and other drilling tools for mining, geotechnical, dam grouting, water well and horizontal directional drilling.

After pumping a 50 barrel high viscosity mud sweep, a short wiper trip was made from TD to just above the basement contact (786.3 mbsf) with the top drive installed. While tripping back to the bottom, the hole had to be reamed from 847.4 to 858.5 mbsf. We then pumped another 50 barrel mud sweep to further clean the hole. Our next step was to release the bit in the bottom of the hole so we could log. The rotary shifting tool (RST) was picked up and run in the hole (RIH). An attempt was made to engage the sleeve in the mechanical bit release (MBR). After being unable to engage the shifting sleeve, the RST was retrieved to the surface. Examination at the surface revealed that the RST did not come back with the core line sinker bars. An overshot (fishing tool) was made up and lowered into the hole to fish for the RST. After securing the RST tool, the MBR sleeve was engaged and the bit dropped from the drill string. The RST tool also dropped off the fishing tool on release, leaving the RST tool in the bottom of the hole. The core line was pulled back to surface and the RST tool for shifting the sleeve back into the original position was deployed. With the bit released, the drill string was raised up to 5196.3 mbrf (805.7 mbsf) with the top drive. The top drive was then set back and the drill string raised up to 5079.7 mbrf (689.1 mbsf). The circulating head was picked up and the hole displaced from 689.1 mbsf to the seafloor with 10.5 ppg high viscosity mud intended to improve logging conditions. The drill string was then raised up and spaced out so that the end of the pipe was at 4490.7 mbrf (100.1 mbsf) for logging operations.

After holding a logging safety meeting for rig floor personnel, the triple combo logging tool string was rigged up and deployed. It reached a total depth of 5236.0 mbrf (845.4 mbsf) on 18 March. The hole was then logged and the tool string pulled to surface and rigged down. After rigging down the triple combo tool string, the FMS-sonic tool string was rigged up and deployed to 5233.0 mbrf (842.4 mbsf). The basement section of the hole was logged five times with three passes with the calipers open. On the last pass, the tool become stuck, but was eventually worked free. The rest of the open hole was logged up to the end of the drill pipe and the tool string was then pulled to the surface and rigged down. All logging equipment was rigged down by 1300 h on 19 March. The drill string and bottom hole assembly (BHA) were recovered and we were secured for transit at 2300 h on 19 March. Total time spent on Hole U1433B was 211.5 h.

The microbiologists collected additional whole-round and split core samples from Hole U1433B for microbiological analysis. Seven samples were taken from the basalt basement, some of which were very massive with low porosity. These samples showed no evidence of fractures and may be impermeable to microbial colonization. Estimates of the geothermal gradient for Site U1433 based on downhole temperatures made by the advanced piston corer temperature tool (APCT-3) suggest that temperatures at the bottom of the hole are approximately 70°C, which is still permissible for microbial survival.

The modified triple combo and FMS-sonic tool strings were run in Hole U1433B on 18 and 19 March. Both tool strings reached 830 m wireline depth below seafloor (WSF), about 18 m above the bottom of the hole. Between 100–550 m WSF, there were rapid variations in borehole diameter from ~25 cm to wider than 43 cm. Below 550 m WSF, the hole diameter tended to be in gauge, with fewer washed out zones. There is a trend of increasing density and sonic velocity from the top of the logs at 100 m WSF down to 750 m WSF due to compaction and cementation with depth. Superimposed on this trend, excursions to higher velocity and photoelectric factor (PEF) and to lower NGR mark the occurrence of carbonate beds. This information was used to infer lithology in the non-recovered intervals of Hole U1433B. In the red clay (Unit III), from ~750 to 800 m WSF, high values in the PEF log indicate that hematite and other oxides increase in concentration downhole toward the top of the basalt at ~800 m WSF. Pillow basalt, a massive basalt flow, fractures, and veins are seen in the FMS images in the basement.

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.

Wireline drill tools can lift drill core from drill rods without picking up bits. All the tools include principal parts of the drill tools, overshotassembly, drill rods, holding dog, circle wrench...

Q3 wireline systems consisit of the same groups as the Q series but utilize a third tube called an inner-tube liner or split tube. The liner is placed inside the inner-tube.

Wireline triple core barrel system consist of the same groups as the double tube core barrel but utilize a third tube help integral core recovery when drilling coal, clay bearing or highly...

Fishing tool is a special fishing drilling tool used to retrieve fallen objects from the borehole. At any stage of the operation, the drill rig operator will encounter unexpected situations, such as falling drill string, stuck pipe, missing drill bit, etc. The equipment that falls into the well is called "fish" or "trash", and the tools used to remove the equipment are called "fishing tools." Sometimes it may be necessary to use "fishing tools" to retrieve older wellbore equipment, such as packers, liners, tubing, or any stuck objects in the well. The drilling tools for fishing must be retrieved from the borehole in order to continue drilling operations.

Overshot is a very common fishing tool. The main fishing object is a smooth tube fish, which belongs to the external fishing type (i.e. catching the external surface of the fish).

Taper tap and die collar are common fishing tools for fishing the inner hole of the string. They are used for fishing the inner hole with holes such as tubing, drill pipe, casing milling pipe, packer, water distributor, etc. It is made of high-quality alloy steel and especially heats treated. It has the advantages of high strength, high toughness, and simple buckle making.

If the 2000 lbs overpull maintained on the cable drops while stripping over, this could indicate that the tool or cable has become free. The following programme shall be adhered to:

6. Lower the drillstring and lartch onto the fish. Do not locate or engage the logging tool with more than 20 000 lbs or the weight advised by the Logging Contractor. A pressure increase shall indicate if the fish is caught in the overshot. A cable head tension increase when lowering the drillstring, or a decrease when pulling the drillstring indicates that the fish is connected.

7. Observe the cable tension. If the tension drops, there is a good chance that the fish has been latched on. Repeat this procedure a few times to make sure this is the case. If there is no drop in tension, Go down with the overshot a little deeper than before and repeat the procedure.