RU2164582C2 - Configuration of lower part of drill pipe string to drive inclined or horizontal holes by screw face motor - Google Patents

Abstract

FIELD: drilling equipment. SUBSTANCE: telescopic system made of cylinder housing piston is positioned between lower pipe of drill pipe string and face motor. Lower part of cylinder has holes communicating its internal space with pipe clearance. Cylinder is connected to drill pipe string and piston is linked to body of motor. Upper butt of piston carries location seat to house stationary or cast off headpiece provided with shank fitting overshot. EFFECT: adjustment of load on face in process of drilling. 5 dwg

Description

 The invention relates to drilling equipment and can be used for drilling directional and horizontal wells.

 The known layout of the downhole motor, which descends into the well on a drill pipe string [1].

 Also known is the layout of the bottom of the drill string for drilling directional and horizontal wells, consisting of a string of drill pipes, a bit, a downhole motor and a telescopic device installed between the bottom pipe of the drill string and the downhole motor [2].

 However, the technical solution for A.S. N 268341 is structurally very complex and does not allow for the regulation of the load on the bottom during drilling.

 The problem is solved due to the fact that the layout of the bottom of the drill string for drilling directional and horizontal wells with a downhole motor, consisting of a drill string, a bit and a downhole motor with support-centering elements on its body, is equipped with a telescopic system installed between the lower drill pipe columns and screw downhole motor and consisting of a cylinder and a piston located inside it, and the cylinder is made in the lower part with holes communicating its internal a cavity with an annulus and is connected to the drill string, and the piston is connected to the engine housing, while a saddle is installed on the upper end of the piston to accommodate a stationary or discharged nozzle made with an overshank.

 The essence of the invention is to equip the layout with a telescopic device consisting of a cylinder made with holes connected to a drill string and a piston connected to the engine body. These signs ensure the creation of a hydraulic load on the engine casing regardless of the position of the engine in the well, followed by its transfer to the bit and maintaining a given axial load on the bit, while making holes in the lower part of the cylinder due to a change in pressure in the system allows you to have information on the surface of the engine passage . In addition, the placement on the upper end of the piston of the landing saddle allows you to adjust the load on the bit by installing a stationary or reset nozzle.

 In FIG. 1 shows a layout diagram, FIG. 2 is a cross-sectional view of the apparatus AA, in FIG. 3 shows a fragment of a piston with a nozzle installed in it; FIG. 4 is a fragment of a piston with a nozzle of a discharge type, and in FIG. 5 - pressure line on the riser of the pump during drilling.

 The layout (Fig. 1) consists of drill pipes 1, a downhole motor 2 with a support-centering element 3 and a chisel 4. The lower end of the drill pipe 1 is connected through a sub 5 to a cylinder 6, in the lower part of which holes 7 are made connecting its inner cavity with annulus.

 Inside the cylinder there is a piston 9 with a shank 10 having a through central channel 11. The shank 10 is connected by a thread to the upper sub 12 of the engine 2.

 In the bore of the lower part of the cylinder (Fig. 2), a spline or other connection is made in contact with a similar connection on the outer surface of the shank.

 The output shaft 13 of the engine 2 is connected with the bit 4.

 When the drilling fluid is supplied, the pressure determined by the differential in the engine and the bit, acting on the upper end of the piston, is transferred to the engine housing and creates an axial load on the bit, proportional to the area of the piston and the differential pressure.

 As the bottom hole is drilled, the bit together with the engine and piston moves down until the internal cavity of the pipes is depressurized through windows 7.

 At this point, the pressure drop in the discharge line begins (Fig. 5), which is an indicator of engine penetration equal to the stroke of the piston group N.

 To bring the arrangements into working position, it is necessary to lower the drill string 1 so that the piston 9 occupies the upper position (shown in Fig. 1).

 Next, the cycle will be repeated.

 In order to regulate the axial load on the bit during drilling, a saddle 14 is made in the piston channel 9, into which a stationary 15 or dumped 16 nozzle with a shank 17 can be inserted (Fig. 4), which will allow to regulate the pressure drop and, ultimately, the load on the bit.

 The proposed layout of the bottom of the drill string gives an economic effect with directional and horizontal drilling (maintaining a given axial load on the bit) and drilling on a flexible continuous pipe (eliminating the need for heavier pipes).

Sources of information
1. Guzman M.T. etc. Downhole screw motors for drilling wells. - M .: Nedra, 1981, p. 16-35.

 2. Tagiev E.I., Zalkin S.L. The method of supplying the bit and setting the load on the face during turbine drilling and a device for its implementation. A. s. N, 268341.

Claims (1)

 The layout of the bottom of the drill string for drilling a well with a downhole motor, consisting of a drill string, a bit and a downhole motor and a telescopic system installed between the bottom pipe of the drill string and the engine and consisting of a cylinder connected to the drill string and a piston located inside it with an engine casing, characterized in that in the lower part of the cylinder there are openings communicating the internal cavity of the cylinder with the annulus, while at the upper end the piston is equipped with a landing saddle for placement of a stationary or discharged nozzle, made with a shank for overshot.

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