The layout for the window cutting in the production string

 

(57) Abstract:

The invention relates to techniques for drilling, namely the recovery of idle or marginal wells by drilling of additional barrels of production casing. The invention consists in that the device for fastening the start of a router on the wedge-diverter is made in the form of a circuit breaker placed in the holes of the starting a router and guide stopper chute whipstock, and the push rod anchor whipstock is located inside the past and has a tapered surface for engagement with a sliding dies, while the push rod is made with emphasis on the face. The invention provides a fast and reliable disconnection of the starting a router with a wedge-diverter. 1 Il.

The invention relates to techniques for drilling, namely the recovery of idle or marginal wells by drilling of additional barrels of production casing.

Recovery wells by drilling of additional barrels of operational colon economically justified and finds more widespread in oil and gas producing areas Rossi who omonovca to cut a window in the production string type MOD includes a set of mill-reamer and the whipstock (Miraliev S. B. and technology sidetracking wells. M., Nedra, 1967, S. 42-56).

The disadvantage of this layout is that the slope and installing a whipstock is made to drain the wedge connected to the wedge-whipstock by means of two bolt connections for cutting which requires additional effort, which may cause damage to the drill pipe, the weight of which creates the necessary load.

In addition, the disadvantage is that you need to make an extra trip to pick up the sling wedge and pull the starter mill to cut the window.

A known arrangement for cutting a window in the production string, which includes the initial mill and whipstock containing the anchor with a pusher, sliding dice and slide guide stopper that is fixed by bolt connection associated with the starting mill. The bolt is placed in the holes of the starting a router and guide stopper chute whipstock (U.S. patent 5341873 published 30.08.94,, N. CL 166/117.5).

The anchor is a hollow cylinder, inside of which is and created the weight of the drilling tool. Pusher, moving up inside the anchor, makes dies on inclined protrusions to contact and traction with the wall of the production string.

The disadvantage of the above arrangement is the possibility of breakage of the drill pipe, through which the force for removal of the bolted connection that secures the starter mill with guide stopper chute whipstock.

Another drawback is the possibility of rotation of the whipstock around the axis of the bore in the unreliable mounting plates anchor whipstock with the wall of the production casing, which is also due to the strength characteristics of drill pipes, the weight of which creates a load on the plunger anchor whipstock.

The present invention is fast, reliable disconnection of the starting a router with a wedge-whipstock and reliable fastening of the anchor whipstock with the wall of the production string.

The solution of this problem is achieved by the fact that in the known arrangement for cutting a window in the production string, which includes the initial mill and whipstock, as the RA and guide stopper chute whipstock, contains an anchor with a pusher and a pull-out dies, according to the invention, the device for fastening made in the form of an isolator placed in the holes of the starting a router and guide stopper chute whipstock, and the push rod is located inside the anchor whipstock and has a tapered surface for engagement with a sliding dies, while the push rod is made with emphasis on the borehole bottom.

NC represents, for example, plunger couple or other separation device located in the holes of the starting a router and guide stopper chute whipstock. The guide stopper is a body breaker. The circuit breaker is triggered when creating a differential pressure of drilling fluid in the hydraulic system proposed layout and produces a fast and reliable separation of the starting mill from the whipstock.

Mounted anchor whipstock is achieved by the fact that the outer working surface of the plunger armature is made conical, as in the case of anchors placed hole die (crackers). Under the influence of the load, the weight of the drilling tool, the plunger into the will idigam die through holes to contact and traction with the wall of the production string.

The starting mill is progolosuju structure having a hollow channel for pumping drilling fluid, the thread for connection with the drill, tubing or downhole motor and carbide cutting edges, employees working bodies for cutting the wall of the production string.

The whipstock includes a cone-shaped groove of the guide stopper and anchor, is a hollow cylinder within which progressively moves the tapered plunger having a cylindrical stem, resting the bottom on the bottom of a well.

The chute and the anchor are connected, for example, threaded, grooved or swivel.

The layout for the window cutting in the production string shown on the accompanying drawing.

The layout for the window cutting in the production string includes: starter mill 1, screw on the pipe or shaft of the downhole motor (not shown) and connected through the circuit breaker 2 with wedge-diverter 3.

NC 2 accommodated in the housing and is at the same time the guide stopper whipstock 3.

Whipstock 3 includes indecency hollow body 7 with holes 8 for cylindrical pointed die 9, held in the depressed condition of the springs 10 to the conical surface of the plunger 11, which is a one or two step truncated cone, having in the lower part of the cylindrical rod 12. Die 9 tapered surfaces of the pusher 11 extended through the openings 8 to contact and introduction of the pointed ends in the wall of the casing 13 when the stop rod 12 to the bottom 14.

The layout for the window cutting in the production string is as follows. The layout down to the bottom 14 of the well (roof cement bridge or straddle packer - not shown) and is fixed in a given direction under the weight of the drill or other tool (not shown). Includes pump (not shown) and the pressure of the flushing fluid actuates the circuit breaker 2, separates the start of a router 1 from the whipstock 3. When the rotor or the rotating shaft of the downhole motor (not shown) is served starting 1 mill down the body of the circuit breaker 2 trough 4 whipstock 3 to contact and introduction of the working surfaces of the start of a router 1 with the wall of the casing 13. Is life ledge and cutting Windows in the walls EMA layout for the window cutting in the production string budget, simple in manufacture and operation, has a rapid and reliable separation of the starting mill from the whipstock without the application of additional load, more reliable fastening anchor whipstock in the wellbore casing, prevents rotation of the whipstock and the likelihood of breakage of the drill pipe or other tool, through which you are loading the layout.

The layout for the window cutting in the production string, which includes the initial mill and whipstock are rigidly connected together by a device for fastening placed in the holes of the starting a router and guide stopper chute whipstock containing the anchor with a pusher and a pull-out dies, characterized in that the device for fastening made in the form of an isolator placed in the holes of the starting a router and guide stopper chute whipstock, and the push rod is located inside the anchor whipstock and has a tapered surface for engagement with a sliding dies, while the push rod is made with emphasis on the face.

 

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