DE102008002835A1 - hooks catcher - Google Patents

Abstract

Hook catcher, with which an object, which is equipped at its head end with a mandrel, caught in a drill string and loosened and released, characterized in that the hook catcher in the drill string the mandrel securely engages while outside the drill string by a simple strain relief on Rope can be released from the thorn.

Description

The The invention relates to a hook catcher comprising an article can catch or grab in a drill string and the outside the drill string by relieving the pull rope from the object can be solved.

I. Technical area

E21B 31/18 "Catching and gripping or loosening objects attacking in the borehole from the outside, z. Cross-over ".

II. State of the art

• 1. "Well tool placement and hositing implementation" (Stokes, 1921) It is known to loosen the connection between hook catcher and tool in a drill string by a cylindrical sleeve is passed over the rope and pressed by gravity on the upper end of the hook catcher so that it opens and releases the mandrel ( US1,442,188 ).
• Second "Overshot" (Stokes, 1928) It is also known to change the hook shape of the hook catcher to avoid snagging in a drill string ( US1,719,144 ).
• Third "Overshot" (Sherman, 1936) In order to prevent jamming of the tool when pulling in the drill string, it is also known to break a defined element in a spring element in the hook catcher, so that it is released and can be recovered without the tool ( US2,128,102 ).
• 4th "Overshot" (Lang, 1938) To protect against the tearing of the pull rope by overloading, due to a jammed tool, it is also known to achieve an automatic release of the hook catcher from the tool ( US2,266,873 ).
• 5th "Dry hole wire core barrel apparatus" (Anderson / Svendsen, 1974) It is also known to use two different hook catchers respectively for inserting a tool into a drill string and for catching or pulling ( US3,930,679 ).
• 6th "Overshot" (Taylor, 1975) For independently releasing the hook catcher of a tool or core tube in the drill string, it is known to modify the principle of the hook catcher so that the sleeve is now part of the hook catcher and is operated by spring force ( US4,004,835 ).
• 7th "Releasing device in core barrel grapplers" (Eriksson / Egnelov, 1981) For mechanically releasing the overshot of the inner core tube in the drill string, it is also known that once the overshot has reached its working position by a groove is incorporated in the drill string at a defined distance from the working position, the opening of a locking hook is allowed in the hook catcher. ( US4431225 )
• 8th. "Cable Overshot Apparatus" (Able, 1998) For safe recovery of a tool or a core tube is also known to pull this on the hook catcher from the pipe and store horizontally. The hook catcher is removed manually by the drill master ( US6,109,373 ).
• 9th "Lockable Overshot" (Beach, 2002) In order to prevent uncontrolled opening when recovering the closure sleeve of the hook catcher, it is known to place the hook of the hook catcher in a protective sleeve, which can be locked by a closure sleeve ( US2004 / 0195852A1 ).
• 10th "Overshot for Down Hole Drilling Operations" (Anderson, 2006) In addition, it is known to provide hook catcher with a sprocket, with the aid of which the hooks in the drill string are opened by repeated pulling ( WO2007 / 041778A1 ).

III. Basic technical problem / question

Of the The invention defined in claim 1 is based on the problem a way of unlocking the safety gear of To develop objects, for example of rope core tubes, in the remote controlled operation without manual assistance outside the drill string can be performed. All require current, commercially available safety gears a manual release by the drill guide. In the standard method of rope core drilling, the drill master secures the inner core tube after pulling out of the drill string, then manually To separate the hook catcher from the thorn (eg in which he the Snap hook opens by finger pressure against the spring resistance).

IV. Solution

This Problem is indicated by the in claim 1 Feature that the hook catcher by a simple strain relief can be solved on the rope, solved.

V. Advantages of the invention

With This invention allows the hook catcher outside a drill string solved without additional manipulation will not have to be reset before next use become. This is especially true for remote-controlled drilling rigs important, which are used, for example, in the Seilkernbohrverfahren.

VI. Figure bullet

The drawings illustrate a particularly suitable for cable core drilling Aus Guidance Example of the invention:

1 is a three-dimensional drawing of the hook catcher.

2 is a partially cutaway side view of the hook catcher.

VII. Embodiment

at the invention is a hook catcher, with a cable core inner tube or other tool (eg Borehole gauge), which at its head end with a thorn equipped, seized in the drill string and with the help a rope can be pulled out of the drill string. To Secure the inner core of the rope core or the tool against a Relapse into the drill string, the hook catcher can be released from the mandrel by simple strain relief on the rope.

Central part of the hook catcher ( 01 ) are two opposite snap hooks ( 02 ) centered by a bolt ( 03 ) with a basic body ( 04 ) are connected. The bolt is fitted with a split pin ( 05 ) secured. The snap hooks are in this suspension in the upper part of the snap hook, by a spring ( 06 ) pressed apart, bringing the hooks ( 07 ) in the lower part of the snap hook ( 02 ) stand firmly opposite.

Meets the hook catcher ( 01 ) in the drill string when lowered onto the mandrel ( 08 ), the snap hooks ( 02 ) by the weight of the hook catcher ( 01 ) pressed apart against the spring force and push over the mandrel ( 08 ). The geometry of the hooks ( 07 ) is to the thorn ( 08 ), which is flat or convex shaped at the bottom, in order to ensure secure gripping of the snap hooks ( 02 ) to ensure. The snap hooks ( 02 ) are connected to the main body ( 04 ), which is tuned with its outside diameter and minimum length to the drill string so that it can slide up and down the drill string and be centered by the drill string. This will ensure that the snap hooks ( 02 ) safely over the centric spine ( 08 ) and after passing over the spine ( 08 ) in the drill string can not solve this. The hook catcher ( 01 ) is with a mounting option ( 09 ) for a rope with which the hook catcher ( 01 ) is guided up and down the drill pipe. The cylindrical basic body ( 04 ) can be parallel to its longitudinal axis with generous grooves ( 10 ) to ensure a rapid lowering of the hook catcher ( 01 ) on the rope in a water-filled drill string. By choice of material and length of the cylindrical body ( 04 ), the weight can be optimized when lowering.

After catching the thorn ( 08 ) Through the hook catcher this is pulled out of the drill string on the rope. In the next step, the rope core inner tube or the tool pulled out of the drill string is secured against slipping off. This can be done for example by a gripping arm, which can also be used for the vertical parking of the tool in a rod magazine. Because the hook catcher ( 01 ) is constructed open at the bottom of the snap hook, just outside the drill string a simple strain relief on the rope, so that the hook ( 07 ) from the thorn ( 08 ) and the hook catcher ( 01 ) is released from the inner core of the rope core or the tool. This slipping in Zugentlasten can z. B. by an asymmetric weight distribution in the hook catcher ( 01 ) are additionally supported. Furthermore, the base ( 11 ) of the cylindrical base body ( 04 ) concave or with an inclined plane, so that the main body ( 04 ) after putting the base ( 11 ) on the thorn ( 08 ) slips sideways.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - US 1442188 [0002]
• US 1719144 [0002]
• - US 2128102 [0002]
• - US 2266873 [0002]
• US 3930679 [0002]
• US 4004835 [0002]
• US 4431225 [0002]
• - US 6109373 [0002]
• US 2004/0195852 A1 [0002]
• - WO 2007/041778 A1 [0002]

Cited non-patent literature

• - "Well tool placement and hositing implementation" (Stokes, 1921) [0002]
• - "Overshot" (Stokes, 1928) [0002]
• - "Overshot" (Sherman, 1936) [0002]
• - "Overshot" (Lang, 1938) [0002]
• "Dry hole wire core barrel apparatus" (Anderson & Svendsen, 1974) [0002]
• - "Overshot" (Taylor, 1975) [0002]
• "Releasing device in core barrel grapplers" (Eriksson / Egnelov, 1981) [0002]
• - "Cable Overshot Apparatus" (Able, 1998) [0002]
• - "Lockable Overshot" (Beach, 2002) [0002]
• Overshot for Down Hole Drilling Operations (Anderson, 2006) [0002]

Claims (14)

Hook catcher, with which an object, which is equipped at its head end with a mandrel, caught in a drill string and loosened and released, characterized in that the hook catcher in the drill string the mandrel securely engages while outside the drill string by a simple strain relief on Rope can be released from the thorn. Hook catcher according to claim 1, characterized that it consists of at least two snap hooks. Hook catcher according to claim 1, characterized that it consists of two opposite snap hooks, which are connected by a bolt to the base body. Hook catcher according to one of the preceding claims, characterized in that the bolt secured with a split pin becomes. Hook catcher according to one of the preceding claims, characterized in that the two opposite Close snap hook by spring force. Hook catcher according to one of the preceding claims, characterized in that the basic body with at least a groove is provided. Hook catcher according to one of the preceding claims, characterized in that the groove parallel to the longitudinal axis runs. Hook catcher according to one of the preceding claims, characterized in that the main body has an outer diameter, a minimum length and a minimum weight, so he in the drill string can slide up and down and centered in the drill string becomes. Hook catcher according to one of the preceding claims, characterized in that at the head of the body a holder is attached to which the hook catcher with a rope can be attached. Hook catcher according to one of the preceding Claims, characterized in that the base of the body forms an inclined plane. Hook catcher according to one of the preceding Claims, characterized in that the snap hook, when lowering in the drill string on the mandrel, through the weight of the hook catcher against the spring force be pressed apart and look over the Push the thorn. Hook catcher according to one of the preceding Claims, characterized in that the snap hook adapted to the geometry of the mandrel. Hook catcher according to one of the preceding Claims, characterized in that the snap hooks over be guided the centric thorn and after crossing of the spine does not detach itself from the drill pipe can. Hook catcher according to one of the preceding Claims, characterized in that the hook catcher in the lower part of the snap hook is open, so that the snap hooks outside the drill string from Thorn slip, as soon as the pull rope is relieved, whereby the hook catcher of Object is solved.