CN2846703Y - Antomatic anti-inclination well drilling tool - Google Patents

Abstract

The utility model relates to an automatic anti-inclination well drilling tool which comprises a drill collar body and an eccentric sleeve, wherein the eccentric sleeve is axially and fixedly sheathed on the drill collar body, a ring groove is arranged on the inner wall of the end part of the eccentric sleeve, a dummy club which is attached to the outside of the drill collar body is arranged at a thin edge position on the end part in an extending mode along an axial direction, an arc-shaped groove which is communicated with the ring groove is arranged in the dummy club, and both ends of the arc-shaped groove are sealed; a through hole which is communicated with an inner cavity of the drill collar body is arranged at the corresponding position of the ring groove on the drill collar body, a diversion hole is arranged at the corresponding position of the arc-shaped groove on the drill collar body, a piston cavity is also arranged on the drill collar body, the bottom of the piston cavity is communicated with the diversion hole by a flow passage which is arranged in a shell body of the drill collar body and a piston is arranged in the piston cavity in a matching mode. The tool can automatically use hydraulic pressure force to generate inclination decreasing force in order to prevent the inclination of a borehole.

Description

Automatic Anti-deviation Drilling Tools

technical field

The utility model relates to an automatic anti-deviation drilling tool, in particular to a drilling tool which can automatically use hydraulic power to prevent the deviation of the borehole by setting an eccentric mechanism on the drill collar body.

Background technique

Drilling is the basic method for the exploration and development of underground resources such as oil and natural gas, and vertical drilling is one of the technical problems often encountered in drilling sites. When drilling vertical wells, if the well deviation is too large, the wellbore will deviate from the underground design target, disrupting the layout of oil and gas field development. In deviated wells, the drill string tends to lean against one side of the well wall, and severe friction occurs during rotation, which may cause the drill string to wear and break, and may also cause accidents such as well wall collapse and keyway sticking. Excessive well inclination will also affect the quality of cementing. Excessive well inclination will directly affect the normal operation of downhole layered production and water injection, and often cause wear and breakage of tubing and sucker rods in pumping wells. Therefore, excessive well deviation will do great harm to the exploration and development of oil and gas fields.

The current drilling tools, including pendulum drilling tools, tower drilling tools, full hole drilling tools, off-axis drilling tools, etc., mainly rely on the weight of the drill string itself to generate the declination force. When the inclination angle is small, the declination force is generally very small. Small, it cannot meet the anti-deviation requirements when drilling in some blocks.

Utility model content

The purpose of the utility model is to provide a drilling tool that can automatically use hydraulic power to generate a descending force, thereby preventing the deviation of the borehole.

In order to achieve the above object, the utility model provides an automatic anti-deviation drilling tool, which includes a drill collar body, and also includes an eccentric sleeve, and the eccentric sleeve is fixedly sleeved on the drill collar body in the axial direction. An annular groove is provided on the inner wall of one end of the sleeve, and the end is located at the thin edge and extends axially with a boss that fits on the outside of the drill collar body. An arc-shaped groove that is closed at both ends of the ring groove; the drill collar body is provided with a through hole that communicates with the inner cavity of the drill collar corresponding to the ring groove; the drill collar body is connected to the arc-shaped groove A diversion hole is provided at the corresponding place; a piston chamber is also provided on the drill collar body, and the bottom of the piston chamber communicates with the diversion hole through a flow channel provided in the shell of the drill collar body; the piston chamber The inner match is provided with a piston.

The utility model utilizes the tumbler principle and the jack principle, when the well inclination exceeds a certain value, the piston protrudes from the high side of the wellbore under the action of hydraulic pressure, pushes the drill bit to the low side of the wellbore, and pushes the drill bit to the low side of the wellbore. The well deviates down so that the wellbore will not deviate from the underground design target and meet the layout design requirements of oil and gas field development. When the drill string rotates, it will not be worn and broken due to severe friction, and will not cause the well wall to collapse and the keyway to get stuck. At the same time, accidents such as drilling will not affect the normal operation of downhole layered mining and water injection. For pumping wells, it will not cause wear and breakage of oil pipes and sucker rods.

The technical solutions of the present utility model will be further described in detail through the drawings and embodiments below.

Description of drawings

Fig. 1 is the sectional view of the utility model embodiment;

Fig. 2 is a partially enlarged view of the hydraulic control part in Fig. 1;

Fig. 3 is the sectional view of drill collar body, piston, bolt in the utility model embodiment;

Fig. 4 is a cross-sectional view of the eccentric sleeve in the embodiment of the utility model.

In the picture:

1 drill collar body 11 drill collar body cavity 12 through hole 13 diversion hole

14 Runner 15 Piston cavity 16 Track groove 2 Eccentric sleeve

21 Ring groove 22 Semi-ring groove 23 Boss 24 Track groove

3 steel balls 4 pistons 41 limit slots 5 bolts

Detailed ways

As shown in Figure 1 and Figure 2, Figure 1 is a cross-sectional view of the utility model embodiment, Figure 2 is a partial enlarged view of the hydraulic control part in Figure 1, the track groove on the eccentric sleeve 2 is in line with the track groove on the drill collar body 1 A plurality of steel balls 3 are arranged in the formed ring, and the eccentric sleeve 2 is axially and fixedly sleeved on the drill collar body 1 by means of the plurality of steel balls 3 . The inner wall of one end of the eccentric sleeve 2 is provided with an annular groove 21, and the end is located at the thin edge and is also provided with a boss 23 extending axially. The section of the boss 23 is fan-shaped, and the arc of the fan is 180 degrees. Cheng semi-tube body shape, it is provided with an arc groove that runs through with ring groove 21 and both ends are closed, and the radian of arc groove can be 160 degree, namely half ring groove 22. On the drill collar body 1 corresponding to the annular groove 21, there is a through hole 12 connected with the internal cavity 11 of the drill collar, and on the drill collar body 1, there is a diversion hole 13 corresponding to the semi-annular groove 22. 1 is also provided with a piston cavity 15, the bottom of the piston cavity 15 communicates with the diversion hole 13 through the flow channel 14 provided in the shell of the drill collar body 1, and a piston 4 is matched in the piston cavity 15.

As shown in Figure 3 and Figure 4, Figure 3 is a cross-sectional view of the drill collar body, piston, and bolt in the embodiment of the utility model, and Figure 4 is a cross-sectional view of the eccentric sleeve in the embodiment of the utility model, the inner wall of the eccentric sleeve 2 is opened There is an arc-shaped orbital groove 24 with a cross-sectional shape, and an arc-shaped orbital groove 16 with an arc-shaped cross-sectional shape is correspondingly provided on the outer surface of the drill collar body 1. The orbital groove formed by the orbital groove 24 and the orbital groove 16 has Multiple steel balls. A limiting groove 41 is provided on the side surface of the piston 4 , and a bolt 5 is provided in the drill collar body 1 , and one end of the bolt 5 is sunk into the limiting groove 41 to limit the moving distance of the piston 4 in the piston cavity 15 .

During the drilling process, the drill collar body 1 rotates. Since the eccentric sleeve 2 and the drill collar body 1 are connected by steel balls 3, the eccentric sleeve 2 will not rotate synchronously with the drill collar body 1. Since the wall thickness of the eccentric sleeve 2 is uneven, its center of gravity is not on the centerline of the drill collar body 1 . When the inclination angle is small and the frictional force on the eccentric sleeve 2 is greater than the gravity component of the eccentric sleeve 2, the eccentric sleeve 2 rotates slowly under the action of the friction force; when the inclination angle reaches a certain value, the eccentric sleeve When the gravitational component of the cylinder 2 is greater than the frictional force, according to the less than Weng principle, the eccentric sleeve 2 stops rotating, and the thick side stops at the low side of the wellbore, and the thin side stops at the high side of the wellbore.

At this time, since the diversion hole 13 is arranged on the drill collar body 1, the diversion hole 13 must rotate together with the drill collar body 1, and the half-ring groove 22 is arranged on the eccentric sleeve 2, so it does not rotate, and The radian of the semi-annular groove 22 is 160 degrees, so the diversion hole 13 sometimes communicates with the semi-annular groove 22, and sometimes directly communicates with the outer annulus of the drill collar body 1 outside the semi-annular groove 22. The boss 23 is arranged at the lower end of the thin side of the eccentric sleeve 2, and the thin side of the eccentric sleeve 2 stops at the high side of the borehole, so the diversion hole 13 communicates with the semi-annular groove 22 only at the high side of the wellbore. Annular groove 21 is communicated with drill collar inner chamber 11 constantly, and at this moment piston chamber 15 is communicated with drill collar inner chamber 11 through runner 14, guide hole 13, semi-annular groove 22, annular groove 21, through hole 12. Since the mud pressure in the internal cavity 11 of the drill collar is higher than the external pressure, according to the principle of the jack, the hydraulic pressure of the mud will act on the piston 4, push the front end of the piston 4 out of the piston cavity 15, and push it against the well wall, resulting in a reaction The force pushes the drill bit to the low side to achieve the declination effect.

When the diversion hole 13 is at the low side of the wellbore, it is directly connected with the outer annular space, and the piston cavity 15 is also directly connected with the outside. At this time, the pressure on both sides of the piston 4 is the same, and no hydraulic pressure acts on it. above, it will be knocked back by the well wall.

One end of the bolt 5 is in the limit groove 41 provided on the surface of the piston 4, which can limit the movable distance of the piston 4, prevent the piston 4 from falling out of the piston cavity, and prevent the piston 4 from retreating too much to block the lower port of the flow channel 14.

In this way, when the drill collar body 1 rotates once, there will be hydraulic pressure acting on the piston 4 at the high side of the wellbore, and the piston 4 will protrude and push against the well wall. The last time the drill bit is pushed to the lower side of the wellbore, under the action of this periodical force, the well deviation will be lowered quickly.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model without limitation. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be The new technical solution shall be modified or equivalently replaced without departing from the spirit and scope of the technical solution of the present utility model.

Claims (4)

1, a kind of automatic anti-oblique well drilling tool, comprise the drill collar body, it is characterized in that: also comprise eccentric adjusting sleeve, this eccentric adjusting sleeve axial restraint is set on the described drill collar body, the inwall of this eccentric adjusting sleeve one end is provided with an annular groove, and be positioned at the featheredge place on this end and extend vertically and be provided with a boss that is fitted in the external side of described drill collar, be provided with the deep-slotted chip breaker of a closed at both ends that connects with described annular groove in this boss; Be provided with the through hole that connects with this drill collar intracoelomic cavity with described annular groove corresponding position on the described drill collar body; Be provided with pod apertures with described deep-slotted chip breaker corresponding position on the described drill collar body; Also be provided with a plunger shaft on the described drill collar body, the bottom of this plunger shaft is communicated with described pod apertures by the runner that is provided with in the housing of described drill collar body; Coupling is provided with a piston in the described plunger shaft.

2, automatic anti-oblique well drilling tool according to claim 1, it is characterized in that: correspondingly respectively on the external surface of the inwall of described eccentric adjusting sleeve and described drill collar body offer the rail groove that cross sectional shape is a circular arc, be provided with a plurality of steel balls in this rail groove around the annular of described drill collar body.

3, automatic anti-oblique well drilling tool according to claim 1 is characterized in that: described boss cross section is fan-shaped.

4, automatic anti-oblique well drilling tool according to claim 1 is characterized in that: described piston face is provided with stopper slot, is provided with a bolt in the described drill collar body, and the end of this bolt is absorbed in the described stopper slot.

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