SU1469094A1 - Bypass valve - Google Patents

Abstract

The invention relates to the mining industry and is intended for drilling wells. The goal is to improve the operation of Shch1nogo qualities due to the provision of mechanical control of the valve and eliminating unproductive losses of hydraulic power and energy to act. For this purpose, the valve seat 10 is installed with a BOZ-:

Description

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. The invention relates to the mining industry, in particular to the technique of drilling squats, and can be used to bypass the flow of fluid in the drill string.

The purpose of the invention is to improve the performance characteristics of the complete use of mechanical control of its operation and the elimination of unproductive losses of hydraulic power and energy to act.

Fig. 1 shows the valve design; FIG. 2 shows a valve seat, an example of embodiment.

The bypass valve includes a housing 1 with the upper 2 and lower 3 inner annular projections inside the housing and radial holes 4 with filters 5 installed in them, a plate 6 with a sealing element 7 on the working surface and a seal located between the projections 2 and 3. body element 8 on the outer side surface. Above the plate 6 mounted elastic element (spring)

9, with its upper end resting in the upper inner annular protrusion 2 of the body, and the lower end in the upper end of the plate 6, Under the plate 6, a saddle 10 is installed, having the possibility of reciprocating motion and fixed by turning with a key 11,

The key 11 is designed to transfer torque from the body 1 to the valve seat 10. Instead of a thin connection of the body 1 to the saddle

10klapa "and can be made any other connection, providing reciprocating movement of the valve seat 10 and the transfer of the circle

0

five

0

five

0

. The moment from body 1 to valve seat 10.

The stroke of the valve seat 10 should satisfy the inequality v 1 1 to press the seat 10 tightly against the plate 6 when the valve seat 10 is moved. .

The spring 9 provides a constant contact of the working surfaces of the plate 6 and the seat 10 when drilling. Instead of spring 9: another elastic element can be used.

The lower part of the saddle 10 protruding from the housing can be performed with a step 12 (for example, as shown in FIG. 2), with the diameter d of the step 12 being larger than the diameter of the saddle 10 itself, which makes it possible to obtain the bearing surface 12 of the saddle 10 contacting the drilling process with the bearing surface of the lower end 13 of the valve body. At the same time, the connecting thread 14 can be made both external and internal (FIG. 2). In the case of a stepped version of the seat

10 valve distance 1, between the lower end 13 of the housing 1 and the upper cut of the stage 12 of the saddle 10 with the lowest position of the saddle 10 relative to the housing 1 is equal to or less than

11 valve seats 10, but more

Running the bottom of the saddle 10

step-shaped with a value of 1} allows, when drilling, to remove a part of the axial load from the spring 9 and transfer it to the valve body t, which facilitates the operation of the spring. i

us 9,

 works as follows.

A bypass valve is installed above the drill bit in any technologically based part of the bottom hole assembly (directly above the Gallows, between the fit drill pipes, etc.). When lowering the bit into the well saddle 10. The valve is almost constantly in the lowest position due to its own weight and the weight of the bottom-hole assembly elements attached to its lower part. The valve plate 6 is also in the extreme low position due to the action of the spring 9 on it. At the same time, there is a sufficiently large gap between the working surfaces of the plate 6 and the seat 10 and the drilling fluid from the annulus through the filter 5, the radial hole 4 and this gap flows inward valve and fills the internal cavity of all elements of the drill string. Chisel down to the bottom and turn on the mud pump. The drilling fluid from the pump enters the drill string and enters the annular space through the radial holes A, filter 5 and the top

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As a result of creating an axial load on the bit, the valve seat 10 moves upwards relative to the housing 1, which causes the working surfaces of the plate 6 and the seat 10 to close. At the same time, the spring 9 is compressed, 5 ft ensuring smoothness of this closure and contact of the working surfaces of the plate 6 and the saddle 10.

The force elements 7 and 8 prevent drilling fluid from escaping from the internal cavity of the valve into the annular space. As a result, the drilling fluid from the pump enters the annular space only through the bit nozzles.

When the valve body 1 rotates, the steep moment is transmitted to the drill bit through the tongue 11.

In order to flush the wells (for example, before lifting the tool for changing the spent bit), the bit is raised above the face to a certain height. In this case, the plate 6 occupies the lowest position due to the action of the spring on it. 55 9 and hydraulic load acting down. The saddle 10 also occupies the lowest position due to the forces of its own weight, the weight of the joining

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to the bottom of the elements of the layout of the bottom of the drill. columns and hydraulic load acting down. As a result, a gap is formed between the working surfaces of the plate 6 and the seat 10, through which the drilling fluid is directed into the annular space through the radial holes A and the filter 5. This causes the flushing to take place with a small value of the pressure drop at the bit nozzles and If the valve is above a hydraulic downhole motor, it practically prevents idle operation of the engine when flushing.

When the instrument is lifted to the surface, the valve elements are in the same position as when flushing. This ensures quick emptying of the upper part of the drill string due to unhindered intensive flow of drilling fluid from the drill string to the annular space through the gap between the working surfaces of the disk 6 and the valve seat 10, radial holes 4 and filter 5, preventing loss of drilling mud and contamination the floor of the drill (workplace drillers) after unscrewing the lead pipe (square) or the upper candle of the drill pipe string.

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the invention

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1, A by-pass valve comprising a housing with radial openings, upper and lower inner annular projections, a seat, a plate with an axial through channel and sealing elements on the working and outer side, an elastic element, and installed in the housing valve sooaio with radial bore-. ti mi filter ,, distinguishing - p. so that, in order to improve performance by providing mechanical control of it. work and eliminate unproductive losses of hydraulic power and energy to act, the valve seat is installed with the possibility of reciprocating limited movement relate the valve body piston, the elastic element is installed above the valve plate and the abutment with its upper end in the upper inner annular protrusion of the body and the lower to the upper end of the plate, and the value. limited valve seat travel satisfies the inequality

1, H,:

where 1, is the stroke value of the valve seat; ij is the axle distance from the working surfaces of the plate and the valve seat when they are in extreme position relative to the KJtanaHa body. 2, Valve jio 1, distinguished by the fact that in the lower part of the valve seat protruding its body

Sa, a sunflower stage, the diameter of which is larger than the diameter of the saddle, and the distance C between the lower end of the body and the upper cut of the saddle stage at the extreme n ({the saddle's position relative to the body meets the inequality

ten ,

. . N

where 1, g is the distance. between the lower end of the body and the upper cut of the seat of the saddle at the extreme lower position of the saddle relative to the body.

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Claims (2)

Claim 1, Bypass valve, comprising a housing with radial holes, upper and lower inner annular protrusions, a seat, a plate with an axial through channel and sealing elements on the working and on. the outer side surfaces, an elastic element and a filter installed in the valve body soooo with radial openings, characterized in that, in order to improve performance by providing mechanical control thereof. operation and elimination of unproductive losses of hydraulic power and energy for actuation, the valve seat is installed with the possibility of reciprocating limited movement relative to the valve body, the elastic element is installed above the valve plate and with its upper end stop in the upper inner annular protrusion of the body, and the lower 5 1469094 6 in the upper end of the plate, and the value of the limited stroke of the valve seat satisfies the inequality ₅ where 1, is the size of the stroke of the saddle; tj is the value of the axial distance from one of the working surfaces of the plate and valve seat when they are ₁₀ in the extreme position relative to the body of the valve. 2, Valve according to π, 1, characterized in that in the lower part of the valve seat protruding from the housing ₁₅ °, a step is made, the diameter of which is larger than the diameter of the seat, and the distance 1 ^ between the lower end of the body and the upper cut of the seat stage when the saddle is in the lowest position relative to the body, it satisfies the inequality 1-r> 1 pl j, where 1, t is the distance between the lower end of the body and the upper section of the saddle stage at the lowermost position of the seat relative to the body. FIG. 2