CN214616392U - Constant-torque and constant-weight-on-bit drilling device - Google Patents

Abstract

The utility model discloses a drilling device with constant torque and drilling pressure, which comprises a spiral mandrel (1); the spiral mandrel (1) is provided with a spiral outer cylinder (2), the inner circle of the spiral outer cylinder (2) is in transmission connection with the spiral mandrel (1) through a spiral transmission pair, and the lower end of the spiral mandrel (1) is in threaded connection with the upper wear-resistant joint (3); the bottom surface of the upper wear-resistant joint (3) is connected with the top surface of the lower wear-resistant joint (4) in a sliding way; the lower end of the spiral outer cylinder (2) is in threaded connection with the outer cylinder (5), and the lower end of the outer cylinder (5) is in threaded connection with the lower joint (6); an energy storage element (7) is arranged between the lower section of the outer cylinder (5) and the lower section of the lower wear-resistant joint (4). The utility model discloses turn into single axial displacement with the motion of axial and circumference and act on energy storage element to store and release energy through energy storage element and slow down the vibration. The drill bit is ensured to rotate at a nearly constant speed, and the mechanical drilling speed of the drill bit is improved. The influence of the bit pressure and the torque on a drill string system can be effectively counteracted, and the drilling efficiency is improved.

Description

Constant-torque and constant-weight-on-bit drilling device

Technical Field

The utility model relates to a moment of torsion and invariable drilling equipment of weight on bit belongs to drilling tool technical field.

Background

With the continuous development and utilization of energy sources and the development of oil and gas extraction technologies, the well depth of a well is increased year by year. In the operation of deep wells and ultra-deep wells, the uncertainty of geological environment is more prominent, and the well body structure is more and more complex due to the fact that the hardness of strata is staggered, the hardness of rocks is increased, the stress of different strata is unevenly distributed, and the like. During the drilling operation of the drill bit under the complex conditions, when the drill bit breaks hard rocks and the drill string and the well wall contact with each other, the drill string system generates vibration in circumferential, transverse and axial forms, wherein the damage of the torsional vibration in the circumferential form and the linear vibration in the axial form is the most serious. The phenomena of circumferential torsional vibration and axial vibration can greatly accelerate the failure of a drill column and a drill bit, and cause the failure of ground equipment, so that underground accidents are caused, the drilling speed of the drill bit is seriously influenced, and the drilling cost is increased. Therefore, there is a need for further improvements in drilling tools to meet the requirements of deep and ultra-deep well operations.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a invariable drilling equipment of moment of torsion and weight on bit to effectively slow down the circumference of drill bit and the vibration phenomenon of axial form, the problem of power insufficiency when effectively solving the drill bit simultaneously and meeting with hard rock can effectively offset the weight on bit and the influence of moment of torsion to the drilling string system and improve drilling efficiency, thereby overcome the not enough of prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model discloses a constant drilling device with torque and drilling pressure, which comprises a spiral mandrel, wherein a spiral outer barrel is arranged on the spiral mandrel, the inner circle of the spiral outer barrel is in transmission connection with the spiral mandrel through a spiral transmission pair, and the lower end of the spiral mandrel is in threaded connection with an upper wear-resistant joint; the bottom surface of the upper wear-resistant joint is connected with the top surface of the lower wear-resistant joint in a sliding manner; the lower end of the spiral outer cylinder is in threaded connection with the outer cylinder, and the lower end of the outer cylinder is in threaded connection with the lower connector; an energy storage element is arranged between the lower section of the outer barrel and the lower section of the lower wear-resistant joint.

In the constant-torque and constant-drilling-pressure drilling device, the upper end of the spiral mandrel is provided with a tapered inner pipe thread connected with a drill rod, the lower end of the spiral mandrel is provided with an external thread connected with the upper wear-resistant joint, and the middle section of the spiral mandrel is provided with an external spiral rib.

In the constant torque and drilling pressure drilling device, a sealing groove is formed in the inner wall of a top opening of the spiral outer cylinder, and a rotary sealing element is arranged in the sealing groove; the lower section of the inner wall of the spiral outer cylinder is provided with an inner spiral groove corresponding to the outer spiral rib; the inner spiral groove is in transmission connection with an outer spiral rib at the middle section of the spiral mandrel; the outer circle of the lower end of the spiral outer barrel is provided with a conical outer pipe thread connected with the outer barrel.

In the drilling device with constant torque and drilling pressure, the outer spiral ribs and the inner spiral grooves are in a multi-line large-lead spiral structure.

In the constant torque and drilling pressure drilling device, a sealing groove is formed in the outer circle of the upper wear-resistant joint; the inner wall of the upper opening of the upper wear-resistant joint is provided with inner pipe threads connected with the spiral core shaft, and the lower end face of the upper wear-resistant joint is a wear-resistant plane.

In the drilling device with constant torque and drilling pressure, the lower wear-resistant joint is a stepped shaft, the end face of a large head at the upper section is a wear-resistant plane, the lower section is a small-outer-diameter shaft, an energy storage element is sleeved on the section of the small-outer-diameter shaft, and the energy storage element is arranged between the shoulder face of the lower wear-resistant joint and the upper end face of the lower joint.

In the constant torque and weight on bit drilling device, the energy storage element is a compression spring or an elastic rubber element or a disc spring.

In the drilling device with constant torque and drilling pressure, the upper opening and the lower opening of the outer cylinder are provided with tapered inner pipe threads; the thread of the conical inner pipe at the upper opening of the outer cylinder is in threaded connection with the thread of the conical outer pipe at the lower end of the spiral outer cylinder; the thread of the conical inner pipe at the lower opening of the outer cylinder is connected with the thread of the conical outer pipe at the upper end of the lower joint.

In the drilling device with constant torque and drilling pressure, the upper end and the lower end of the lower joint are provided with tapered outer pipe threads; the thread of the conical outer pipe at the upper end of the lower joint is connected with the thread of the conical inner pipe at the lower opening of the outer cylinder; the conical outer pipe thread at the lower end of the lower joint is connected with a drill bit.

In the drilling device with constant torque and drilling pressure, the centers of the spiral mandrel, the upper wear-resistant joint, the lower wear-resistant joint and the lower joint are provided with water holes.

Since the technical scheme is used, the utility model discloses a compared with the prior art, the utility model discloses a vice rotation of helical drive makes and produces the spiral displacement between spiral mandrel and the spiral urceolus to turn into single axial displacement through last wear joint and the slip wear surface between the lower wear joint with axial and circumference's motion and act on energy storage element, through energy storage element's storage and release energy slow down the vibration. The vibration phenomenon of the circumferential and axial forms of the drill bit is effectively relieved. The vibration phenomenon of the circumferential and axial forms of the drill bit can be effectively relieved. Meanwhile, the energy storage element stores energy when the vibration amplitude is large, and releases the stored energy when the torque and the bit pressure are insufficient, so that the purpose of automatically adjusting the torque and the bit pressure according to the torque and the bit pressure of the drill bit is achieved, and the effects of constant torque and bit pressure are achieved. The drill bit is ensured to rotate at a nearly constant speed, and the mechanical drilling speed of the drill bit is improved. The problem of power shortage when the drill bit encounters hard rock is effectively solved, the influence of the bit pressure and the torque on a drill column system can be effectively offset, and the drilling efficiency is improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic structural view of the spiral mandrel of the present invention;

FIG. 3 is a schematic structural view of the spiral outer cylinder of the present invention;

fig. 4 is a schematic structural view of an upper wear joint of the present invention;

fig. 5 is a schematic structural view of the lower wear joint of the present invention;

FIG. 6 is a schematic structural view of the outer barrel of the present invention;

fig. 7 is a schematic structural diagram of the lower joint of the present invention.

The labels in the figures are: 1-spiral mandrel, 2-spiral outer cylinder, 3-upper wear-resistant joint, 4-lower wear-resistant joint, 5-outer cylinder, 6-lower joint, 7-energy storage element, 8-tapered inner pipe thread, 9-external thread, 10-external spiral rib, 11-sealing groove, 12-rotary sealing element, 13-internal spiral groove, 14-tapered outer pipe thread, 15-internal thread, 16-small outer diameter shaft and 17-water hole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

The utility model relates to a constant torque and drilling pressure drilling device, as shown in figure 1, comprising a spiral mandrel 1, a spiralouter cylinder 2 is arranged on the spiral mandrel 1, the inner circle of the spiralouter cylinder 2 is in transmission connection with the spiral mandrel 1 through a spiral transmission pair, and the lower end of the spiral mandrel 1 is in threaded connection with an upper wear-resistant joint 3; the bottom surface of the upper wear-resistant joint 3 is connected with the top surface of the lower wear-resistant joint 4 in a sliding manner; the lower end of the spiralouter cylinder 2 is in threaded connection with anouter cylinder 5, and the lower end of theouter cylinder 5 is in threaded connection with a lower connector 6; anenergy storage element 7 is arranged between the lower section of theouter cylinder 5 and the lower section of the lower wear-resistant joint 4. The centers of the spiral mandrel 1, the upper wear-resistant joint 3, the lower wear-resistant joint 4 and the lower joint 6 are all provided withwater holes 17.

As shown in fig. 2, the upper end of the spiral mandrel 1 is provided with a taperedinner pipe thread 8 connected with the drill rod, the lower end of the spiral mandrel 1 is provided with anouter thread 9 connected with the upper wear-resistant joint 3, and the middle section of the spiral mandrel 1 is provided with an outerspiral rib 10.

As shown in fig. 3, asealing groove 11 is arranged on the inner wall of the top opening of the spiralouter cylinder 2, and arotary sealing element 12 is arranged in thesealing groove 11; the lower section of the inner wall of the spiralouter cylinder 2 is provided with an innerspiral groove 13 corresponding to theouter spiral rib 10; the innerspiral groove 13 is in transmission connection with anouter spiral rib 10 at the middle section of the spiral mandrel 1; the outer circle of the lower end of the spiralouter cylinder 2 is provided with a conicalouter pipe thread 14 connected with theouter cylinder 5. Theouter spiral rib 10 and the innerspiral groove 13 are of a multi-thread large-lead spiral structure.

As shown in fig. 4, asealing groove 11 is arranged on the outer circle of the upper wear-resistant joint 3, and arotary sealing element 12 is arranged in the sealinggroove 11; the inner wall of the upper opening of the upper wear-resistant joint 3 is provided with aninner pipe thread 15 connected with the spiral mandrel 1, and the lower end face of the upper wear-resistant joint 3 is a wear-resistant plane.

As shown in fig. 5, the lower wear-resistant joint 4 is a stepped shaft, the end surface of the large head of the upper section is a wear-resistant plane, the lower section is a smallouter diameter shaft 16, theenergy storage element 7 is sleeved on the smallouter diameter shaft 16, and theenergy storage element 7 is arranged between the shoulder surface of the lower wear-resistant joint 4 and the upper end surface of the lower joint 6. Theenergy storage element 7 is a compression spring or an elastic rubber element or a disc spring.

As shown in fig. 6, the upper and lower openings of theouter cylinder 5 are provided with taperedinner pipe threads 8; the conicalinner pipe thread 8 at the upper opening of theouter cylinder 5 is connected with the conicalouter pipe thread 14 at the lower end of the spiralouter cylinder 2; the conicalinner pipe thread 8 at the lower opening of theouter cylinder 5 is connected with the conicalouter pipe thread 14 at the upper end of the lower joint 6.

As shown in fig. 7, the upper and lower ends of the lower joint 6 are provided with taperedouter pipe threads 14; the conicalouter pipe thread 14 at the upper end of the lower joint 6 is connected with the conicalinner pipe thread 8 at the lower opening of theouter cylinder 5; the conicalouter pipe thread 14 at the lower end of the lower joint 6 is connected with a drill bit.

Examples

The drill string torque transfer process in this example is: the tapered inner pipe thread of the screw spindle → the screw transmission pair → the screw outer cylinder → the lower joint → the tapered outer pipe thread of the lower joint.

The helical mandrel 1 ensures the connection of the tool to the upper part of the drill string system by means of the taperedinternal pipe thread 8 at the upper end. The screw transmission pair is a kinematic pair between the screw mandrel 1 and the screwouter cylinder 2, and adopts a multi-thread large-lead screw mechanism, which has two specific functions: first, axial displacement: the multi-thread large-lead screw mechanism effectively avoids a screw self-locking angle and ensures the axial displacement between the screw mandrel 1 and the screwouter cylinder 2. Secondly, torsional motion: the multi-line large-lead screw mechanism ensures circumferential motion and torque transmission.

The spiralouter cylinder 2 is connected with the spiral mandrel 1 in a sliding mode through a spiral transmission pair to transmit torque, and the lower portion of the spiralouter cylinder 2 is in threaded connection with theouter cylinder 5. A rotary sealing structure is arranged between the inner hole of the spiralouter barrel 2 and the upper wear-resistant joint 3, so that effective sealing in the rotary moving process is ensured.

The upper wear-resistant joint 3 is in threaded connection with the spiral mandrel 1, and axial lifting force transmission of the tool is guaranteed. The rotational movement of the tool is converted into an axial displacement by means of a sliding wear surface with thelower wear joint 4. Two sealing grooves are arranged outside the upper wear-resistant joint 3 to install rotary sealing elements, so that bidirectional effective sealing between the rotary joint and theouter cylinder 5 is ensured in the rotary moving process.

The sliding wear-resistant surface between the upper wear-resistant joint 3 and the lower wear-resistant joint 4 is strengthened through heat treatment, and the service life of rotary movement is ensured.

Theenergy storage element 7 is a large-rigidity elastic element and can effectively store and release energy.

The screw drive pair is matched with the lower energy storage element, and has four specific functions: one is to dampen the circumferential form of vibration: during the transmission of the torque of the screw transmission pair, the screw mandrel 1 and the screwouter cylinder 2 generate axial displacement during relative rotation, the axial and axial movement is converted into single axial displacement to act on theenergy storage element 7 through the sliding wear-resistant surface, and the vibration is reduced through the energy stored and released by theenergy storage element 7. Secondly, compensating the insufficient torque: in the process, theenergy storage element 7 stores energy when the vibration amplitude is large, and releases the stored energy when the torque is insufficient, so that the effect of compensating the torque insufficiency is achieved, and the effect of keeping constant torque is achieved. Thirdly, the vibration in the axial form is relieved: during the drilling operation of the drill bit, the change of the bit pressure acts on theenergy storage element 7 through the spiral mandrel 1 → theupper wear joint 3 → thelower wear joint 4, and the vibration is reduced through the energy storage and release of theenergy storage element 7. Fourthly, compensating insufficient bit pressure: in the process, theenergy storage element 7 stores energy when the vibration amplitude is large, and releases the stored energy when the bit pressure is insufficient, so that the effect of compensating the bit pressure insufficiency is achieved, and the effect of keeping the bit pressure constant is achieved.

Thelower wear joint 4 fixes theenergy storage element 7 between the lower joints 6, and converts the rotary movement of the tool into axial displacement by sliding the wear surface with theupper wear joint 3.

Theouter cylinder 5 is in threaded connection with the spiralouter cylinder 2 and the lower connector 6 to form a sealed cavity.

The lower sub 6 secures the tool to the lower portion of the drill string system by means of the taperedexternal pipe thread 14 at the lower end of the lower sub.

The utility model discloses the drill bit bores the operation in-process, and the vibration of drilling string system circumference and axial form produces spiral circumferential motion and axial displacement between messenger's spiral mandrel and the spiral urceolus through the vice rotation action of helical drive, and the wear-resisting face that slides turns into single axial displacement with this kind of motion that contains axial and circumference and acts on energy storage element, slows down the vibration with release energy through energy storage element's storage. The vibration phenomenon of the circumferential and axial forms of the drill bit is effectively relieved.

In the process, the energy storage element stores energy when the vibration amplitude is large, and releases the stored energy when the torque and the bit pressure are insufficient, so that the aim of automatically adjusting the torque and the bit pressure according to the torque and the bit pressure of the drill bit is fulfilled, and the effects of constant torque and bit pressure are achieved. The drill bit is ensured to rotate at a nearly constant speed, and the mechanical drilling speed is improved. The problem of insufficient power when the drill bit encounters hard rock is effectively solved, and the influence of the applicable drilling conditions and other conditions is expanded.

The drilling tool with constant torque and bit pressure can effectively counteract the influence of the bit pressure and the torque on a drill string system and improve the mechanical drilling speed.

Claims (10)

1. A constant torque and weight on bit drilling device comprising a helical mandrel (1), characterized in that: the spiral mandrel (1) is provided with a spiral outer cylinder (2), the inner circle of the spiral outer cylinder (2) is in transmission connection with the spiral mandrel (1) through a spiral transmission pair, and the lower end of the spiral mandrel (1) is in threaded connection with the upper wear-resistant joint (3); the bottom surface of the upper wear-resistant joint (3) is connected with the top surface of the lower wear-resistant joint (4) in a sliding way; the lower end of the spiral outer cylinder (2) is in threaded connection with the outer cylinder (5), and the lower end of the outer cylinder (5) is in threaded connection with the lower joint (6); an energy storage element (7) is arranged between the lower section of the outer cylinder (5) and the lower section of the lower wear-resistant joint (4).

2. Constant torque and weight on bit drilling device as claimed in claim 1, wherein: the drill rod drilling tool is characterized in that a conical inner pipe thread (8) connected with a drill rod is arranged at the upper end of the spiral mandrel (1), an external thread (9) connected with the upper wear-resistant connector (3) is arranged at the lower end of the spiral mandrel (1), and an external spiral rib (10) is arranged at the middle section of the spiral mandrel (1).

3. Constant torque and weight on bit drilling device as claimed in claim 2, wherein: a sealing groove (11) is formed in the inner wall of the top opening of the spiral outer cylinder (2), and a rotary sealing element (12) is arranged in the sealing groove (11); the lower section of the inner wall of the spiral outer cylinder (2) is provided with an inner spiral groove (13) corresponding to the outer spiral rib (10); the inner spiral groove (13) is in transmission connection with an outer spiral rib (10) at the middle section of the spiral mandrel (1); the outer circle of the lower end of the spiral outer cylinder (2) is provided with a conical outer pipe thread (14) connected with the outer cylinder (5).

4. Constant torque and weight on bit drilling device as claimed in claim 3, characterized in that: the outer spiral rib (10) and the inner spiral groove (13) are of a multi-line large-lead spiral structure.

5. Constant torque and weight on bit drilling device as claimed in claim 4, wherein: a sealing groove (11) is formed in the outer circle of the upper wear-resistant joint (3); an inner pipe thread (15) connected with the spiral mandrel (1) is arranged on the inner wall of the upper opening of the upper wear-resistant joint (3), and the lower end face of the upper wear-resistant joint (3) is a wear-resistant plane.

6. Constant torque and weight on bit drilling device as claimed in claim 5, characterized in that: the lower wear-resistant joint (4) is a stepped shaft, the end face of a large head at the upper section is a wear-resistant plane, the lower section is a small outer diameter shaft (16), an energy storage element (7) is sleeved on the section of the small outer diameter shaft (16), and the energy storage element (7) is arranged between the shoulder surface of the lower wear-resistant joint (4) and the upper end face of the lower joint (6).

7. Constant torque and weight on bit drilling device as claimed in claim 6, characterized in that: the energy storage element (7) is a compression spring or an elastic rubber element or a disc spring.

8. Constant torque and weight on bit drilling device as claimed in claim 7, wherein: the upper opening and the lower opening of the outer barrel (5) are provided with conical inner pipe threads (8); a conical inner pipe thread (8) at the upper opening of the outer cylinder (5) is connected with a conical outer pipe thread (14) at the lower end of the spiral outer cylinder (2); the conical inner pipe thread (8) at the lower opening of the outer cylinder (5) is connected with the conical outer pipe thread (14) at the upper end of the lower joint (6).

9. Constant torque and weight on bit drilling device as claimed in claim 8, wherein: the upper end and the lower end of the lower joint (6) are provided with tapered outer pipe threads (14); a conical outer pipe thread (14) at the upper end of the lower joint (6) is connected with a conical inner pipe thread (8) at the lower opening of the outer cylinder (5); the conical outer pipe thread (14) at the lower end of the lower joint (6) is connected with a drill bit.

10. Constant torque and weight on bit drilling device as claimed in claim 9, wherein: the centers of the spiral mandrel (1), the upper wear-resistant joint (3), the lower wear-resistant joint (4) and the lower joint (6) are all provided with water holes (17).

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