wireline overshot quotation

The Wireline Releasable Overshot is a slip type overshot used to retrieve a fish lost in the well bore that does not have a conventional fishing neck.

Once latched onto a fish the overshot can be released by jarring downwards provided the overshot has a solid footing upon which the core can be driven against.

The Wireline Releasable Overshot is composed of the top sub, cylinder, nut, main spring, mandrel, auxiliary spring, adapter sleeve, slips etc., simple structure,easy to use.

Overshots are a key component of wireline coring systems. To retrieve the core sample, the overshot is lowered into the hole on a wire cable until it comes in contact with the spearhead point on the head assembly. Positive latching lifting dogs securely attach, and the inner tube assembly is pulled from the hole to retrieve the core. V-lock Overshots Hole Products" V-lock overshots are safe, reliable, fast, and easy to use. The automatic safety feature is designed to reduce the chance of an accidental release. When the inner tube assembly is attached and lifted, the lifting dogs automatically retract into position. No extra manual steps are required to activate the safety feature, thus reducing the potential for human error. Standard Overshots Hole Products" standard overshots feature a manual safety lock pin. Once the core filled inner tube is hoisted above the top of the drill rods the safety lock pin can be inserted through the overshot head and under the spearhead point. This will allow the operator to hoist and remove the core sample from the inner tube.

Baoji Ruixin Energy Equipment Co., Ltd. was established in 2012. It is an IS0: 9001-2015 and API Q1 system certified technology research and development organization specializing in the design and manufacture of steel wire, cable and coiled tubing tools. With strong new product research and development capabilities, it has obtained 12 national utility model patent certificates and 1 invention patent certificate. Undertook two prefecture-level and provincial-level scientific research projects. Our products include wireline wireline wellhead blowout prevention equipment, wireline downhole tools and coiled tubing downhole tools. At present, we have provided professional equipment and technical support to more than 50 oilfield service companies in various regions at home and abroad.

The slip overshot is used to salvage tools or objects that have no conventional salvage necks in the well. After being shaken down, the salvaged objects can be caught, and then the tools can be lifted out. The structure is simple and easy to use.

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.

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.

Wireline series: Geobor S, WLA, WLB, WLN, WLH, WLP, WLB3, WLN3, WLH3, WLP3, WLN2, AQ, BQ, NQ, HQ, PQ, SQ, PQ3, HQ3, NQ3, BQ3, NQ2, WL-56, WL-66, WL-76

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Since Boart Longyear introduced the Q™ Wireline system in 1966, retrieving the inner tube from the core barrel has been handled the same way: an overshot with lifting dogs (spring loaded hooked “fingers”) is lowered or pumped into the hole until it snaps over a pivoting spearhead mechanism affixed to the inner tube assembly. Once the head assembly has been removed from the hole, the driller uses the pivoting spearhead to position the head assembly on their workspace and squeezes the back of the lifting dogs to release.

Inner Tube Handling: When hoisting the inner tube assembly, elastic action of the wireline cable or accidental impact during handling can un-load cable tension and overcome spring loads which allows the hooked lifting dogs to accidentally release the spearhead. The surface ‘Ezy-Lock™’ overshot includes a twist-sleeve that locks onto the spearhead even without cable tension, whereas competing overshots require cable tension to maintain a lock.

Boart Longyear currently provides a secondary safety pin that clips through the overshot, passing just under the spearhead tip. This adds an extra layer of protection in case the lifting dogs are excessively worn or deformed. However, spearheads are loaded cyclically and often loaded ‘off-pivot’, which deforms the components over time, to the point of disassembly. While the more recent MKII™ version of the spearhead assembly is much more robust, in the case of spearhead failure, the head assembly will release from the overshot regardless of lifting dog or safety pin use or condition.

This patent-pending overshot leverages our previous experience with Roller Latch™ head assemblies to create a more reliable and longer lasting system that eliminates spearheads and lifting dogs entirely. The spearhead assembly is replaced by a one-piece socket receptacle (spearhead adapter) that accepts the overshot itself, which has rollers that latch into an internal groove in the spearhead adapter.

The increased toughness and hardness of the bearing quality latch rollers have a proven history of outlasting traditional pivoting latches for wear life. The new overshot will also feature the same Nitreg™-ONC surface treatment as Roller Latch head assemblies that drastically improves corrosion resistance (Nitreg is a trademark of Nitrex Inc.).

Safety pin integration in the new underground Quick Pump-In™ overshot now pulls double duty of both locking the overshot from accidentally releasing while hoisting, as well as holding the head assembly and overshot together in case of component failure due to excessive wear. Also, the socket and rollers are not affected by side loading and ‘off-pivot’ loading during tube handling outside the hole, eliminating gradual deformation or disassembly. The new surface overshot will also include a one-hand twist-lock sleeve to maintain a locked position while hoisting outside the hole, even with a loss of wireline cable tension.

It’s also easy to use.  Instead of pushing the backs of the lifting dogs together, the driller pushes the two halves of the assembly together, retracting the rollers and releasing the head assembly. This operation takes about the same amount of force as the current overshot, so drillers won’t miss a beat.

Additional benefits have been included[CA1]  apart from the elimination of the spearhead and lifting dogs. While the current design uses a solid pivot pin that is peened into place (making it difficult to re-build), the Roller Latch Overshot has no pins whatsoever. Everything is held in place by simple threaded connections for easy maintenance.

First, in the event of a stuck tube, the driller needs to disengage and retrieve wireline cable in order to pull rods. Today, that is done by overloading and breaking a shear pin placed just underneath the cable swivel. In theory this pin breaks at under half the wireline cable’s max load capacity, but in practice its strength is highly variable because shear pins are inherently weak and ductile. Many operators remove the shear pin, which removes release capability and may result in excessive wireline cable replacement.

The Roller Latch Overshot features a brand new pump-in cable release system, originally conceptualized and prototyped by one of our expert underground drillers in Canada. A slotted sleeve and pumping seal assembly is placed over the wireline and pumped up to the overshot. The sleeve engages a quick-release mechanism and releases the wireline. This system has proven to be much more reliable, and may be the feature drillers are most thrilled to have going forward.  Reports of fewer broken wirelines have been received from several sites testing the pump-in cable release system.

To combat this and make Q/P Roller Latch easier to use while maintaining its safety features, a ‘brake release spring’ was created. This spring assembles quickly inside of the spearhead adapter on the head assembly. While tripping on its own, the head assembly brake works normally, but when the overshot latches into it this spring is compressed, disengaging the brake. This feature has also been received very positively by drillers in the field.

A surface-style overshot is also in development in B/N/H sizes. In addition to many of the features outlined in this article, the aim is to add more innovations, including:

• An improved lock sleeve to disable accidental head assembly release and stop drillers from accidentally sending the overshot down the hole while locked.

Excitement is high as testing continues. Drillers are noting the various positive developments: it’s easier to use, saves on wireline, and makes working with Q/P Roller Latch head assemblies much easier in difficult conditions. We’re looking forward to further field success as testing begins on the surface design.

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

The BT Casing Overshot Housing is designed to house a conventional pulling tool while giving the user the versatility of having a larger OD while trying to latch a small fishneck.

The BT Casing Overshot Housing is generally used when there is a need to latch a small fishneck in larger diameter pipe or tubing, by inserting a conventional pulling tool into the top sub, and installed the proper size bell on the overshot housing, the ability to latch a small fishneck in larger bores is possible with great ease.

The BT Casing Overshot Housing is also valuable during fishing operations, the bell on the bottom of the overshot eliminates the risk of travelling past the desired target during fishing operations, bells can be machined to specific sizes to accommodate job specifics.

Designed to complement the Sonic Dual Tube 6 in. (SDT60) system for sonic applications, the SDT60 Weighted Wireline (WWL) core drilling system from Geoprobe® adds yet another innovative tool to the Geoprobe® sonic tool box. While conventional wireline core drilling systems with various latching mechanisms have proven themselves in the coring world, their adaptation to sonic applications has not been without its challenges.

Jed Davis, lead engineer for the new system, said that conventional wireline core drilling systems utilize a mechanical latch to hold a core barrel in place inside of the core rod at the bottom of the tool string. “The tool string (core barrel and core rod) is advanced through the sampling interval,” Davis explained. “A release tool (overshot) is then lowered down to release the mechanical latch so the core barrel can be retracted.”

The ‘secret’ behind the SDT60 Weighted Wireline design is ... Mass. The core barrel uses a simple weight system to hold it in place at the bottom of the tool string rather than a mechanical latch. In other words, the latching mechanism is replaced by a weight system.

According to Davis, one critical design feature of this wireline core drilling system is the adaptation of the modular weight system to the Geoprobe® rod handler. “Once the weight system is initially put into the tool string, it’s not handled by us again until after the last sample has been retrieved from the borehole,” he said. During every sample extraction at ground surface, the weight system is easily handled by the rod handler and never by the driller or driller’s helper. “Coming from someone who spends their days outside working with tools, that’s a great thing!” Davis added.

The SDT60 Weighted Wireline system is designed to complement the standard SDT60 tooling. Davis recommends using standard SDT60 tooling with 2.25-in. center rods in softer, shallower formations. When deeper intervals (50 feet plus) or consolidated formations are encountered, “the weighted wireline core drilling system can easily be implemented without pulling the casing,” Davis added.

The SDT45 and SDT60 and the SDT45 and SDT60 Weighted Wireline systems are designed by and available exclusively through Geoprobe Systems®, and can be used under most sonic rigs.

The Coil Solutions Overshots are used to engage and pull a fish from the well bore. It uses a grapple to bite into the outside of the fish and releases by following through a predetermined rate to disengage the grapple. The tool comes with a range of grapples to accommodate various fish sizes.