CN109750992B - Screw drill tool face stabilizer - Google Patents
Screw drill tool face stabilizer Download PDFInfo
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- CN109750992B CN109750992B CN201711056166.5A CN201711056166A CN109750992B CN 109750992 B CN109750992 B CN 109750992B CN 201711056166 A CN201711056166 A CN 201711056166A CN 109750992 B CN109750992 B CN 109750992B
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Abstract
The invention relates to a tool face stabilizer of a screw drill, belonging to the field of drilling tools, comprising a shell and a mandrel, wherein the middle part of the mandrel penetrates through the shell, and two ends of the mandrel are positioned outside the shell; a borehole wall friction assembly disposed on the housing, the borehole wall friction assembly configured to cause the housing to generate a frictional force with a borehole wall; and a friction plate assembly disposed between the outer shell and the spindle, the friction plate assembly being configured to enable a frictional force to be generated between the outer shell and the spindle. The well wall friction assembly is clamped on the well wall to offset the reaction torque of the screw drilling tool. The friction force is controlled by the discharge of the drilling fluid and is not influenced by the motion state and the underground environment, so that the friction force is more stable, and the working surface of the screw drilling tool is more stable; meanwhile, the friction force of the well wall friction assembly is convenient to control, and the magnitude of the friction force is controlled according to different requirements.
Description
Technical Field
The invention relates to a tool face stabilizer of a screw drill, which is used for directional well drilling.
Background
The screw drilling tool is widely applied to directional wells and horizontal wells, and when the screw drilling tool works, a rotor of the screw drilling tool drives a drill bit to rotate clockwise under the driving of drilling fluid energy, and a certain torque is generated to crush rocks. The reaction torque has been produced simultaneously on the stator of screw rod drilling tool, the reaction torque act on with stator and shell, the shell is connected with the drilling string, when drilling string one end was pinned, because the elasticity of drilling string, reaction torque can make screw rod drilling tool and drilling string anticlockwise rotation certain angle. Because the tool face of the screw drill is disposed on the housing, counterclockwise rotation of the housing can cause a change in the tool face, thereby affecting control of the borehole trajectory.
To solve the above problem, a stabilizer is generally used to suppress the reaction torque. The stabilizer is located in the drill string as part of the drill string, and has a diameter greater than the diameter of the drill string and close to the diameter of the borehole, the weight of the auger and the drill string creating friction where the stabilizer contacts the borehole wall. The friction force can effectively restrain the reaction torque of the screw drill. Among the conventional stabilizers, both the straight edge stabilizer and the spiral stabilizer have a certain effect of suppressing the reaction torque, but the strength of suppressing the reaction torque is insufficient. The slip type tool face stabilizer is a counter-torque controller specially used for stabilizing a tool face, certain drilling fluid energy needs to be consumed, slips are directly clamped on a well wall, and if the counter-torque is large, the slips can be directly driven to damage the well wall, so that the accident of well wall collapse is caused.
Disclosure of Invention
In order to solve the problems, the invention provides a tool face stabilizer of a screw drill, which can offset the reaction torque borne by the screw drill, improve the strength for inhibiting the reaction torque and is safer.
The invention provides a tool face stabilizer of a screw drill, which comprises:
the outer shell is provided with a plurality of grooves,
a mandrel passing through the housing and having both ends located outside the housing;
a borehole wall friction assembly disposed on the housing, the borehole wall friction assembly configured to cause the housing to generate a frictional force with a borehole wall; and
a friction plate assembly disposed between the outer shell and the spindle, the friction plate assembly configured to enable a frictional force to be generated between the outer shell and the spindle.
In a further development of the invention, the mandrel is provided with a pressure transfer opening in the radial direction, the outlet of which is aligned with the inner wall of the housing.
A further improvement of the present invention is that the sidewall friction assembly includes a radial bore through the outer wall of the housing and a thrust piston sealingly disposed within the radial bore.
A further development of the invention is that the radial bore comprises an inner section close to the centre of the mandrel and an outer section remote from the centre of the mandrel, wherein the diameter of the inner section is larger than the diameter of the outer section.
A further development of the invention is that the thrust piston comprises a piston cap movable in the inner section, and a piston rod movable in the outer section.
The invention has the further improvement that the shell is cylindrical, one end of the inner cavity of the shell is provided with an annular groove, and the annular groove is sealed by a sealing cover;
wherein the friction plate assembly is disposed within the annular groove.
The friction plate assembly comprises a plurality of friction dynamic plates arranged on the outer wall of the mandrel and a plurality of friction static plates arranged on the inner wall of the shell; wherein the friction rotor and the friction stator are arranged at intervals.
The friction plate assembly further comprises a disc spring arranged in the annular groove, one end of the disc spring is connected to the end wall of the annular groove, and the other end of the disc spring is connected with the friction plate at the outermost edge.
The invention is further improved in that the mandrel is provided with two positioning bolts which are respectively arranged on two sides of the shell.
A further development of the invention is that the two ends of the housing are connected to the mandrel by sealing means.
Compared with the prior art, the invention has the advantages that:
when the well wall friction assembly in the tool surface stabilizer of the screw drilling tool works, friction force is generated between the pushing piston and the well wall. The friction force enables the well wall friction assembly to be clamped on the well wall, and counteracts the reaction torque of the screw drilling tool. The friction force is controlled by the discharge of the drilling fluid and is not influenced by the motion state and the underground environment, so that the friction force is more stable, and the working surface of the screw drilling tool is more stable; meanwhile, the friction force of the well wall friction assembly is convenient to control, and the magnitude of the friction force is controlled according to different requirements.
In the tool surface stabilizer of the screw drilling tool, the friction force generated by the friction plate assembly is smaller than the friction force generated by the well wall friction assembly, and when the reaction torque of the screw drilling tool is transmitted to the mandrel during directional drilling, the friction force generated by the friction plate prevents the mandrel from moving. Thereby maintaining the stability of the tool face of the screw drill. When the composite drilling is carried out, the friction force generated by the friction plate is smaller than the friction force between the well wall friction assembly and the well wall, when the turntable is started to drive the drill rod to move, the drill rod drives the mandrel and the screw drilling tool to rotate, but the shell and the piston are fixed and do not rotate. Therefore, the phenomenon that the rotary motion of the piston damages the well wall to cause the collapse of the well wall is prevented, and the underground safety is improved.
Drawings
FIG. 1 is a schematic view of a progressive cavity tool face stabilizer according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1, showing a schematic cross-sectional view of a wellbore wall friction assembly in accordance with the present invention;
FIG. 3 is a cross-sectional view B-B of FIG. 1, showing a cross-sectional schematic view of a friction plate assembly according to the present invention
FIG. 4 is a schematic view of a friction rotor attachment according to one embodiment of the present invention;
FIG. 5 is a schematic representation of a friction stator connection according to one embodiment of the present invention.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
The meaning of the reference symbols in the drawings is as follows: 10. the friction plate assembly comprises a shell, 11, an annular groove, 12, a sealing cover, 20, a mandrel, 21, a pressure transmission hole, 13, a sealing device, 22, a lower joint, 23, a positioning bolt, 30, a well wall friction assembly, 31, a radial hole, 32, an inner section, 33, an outer section, 34, a pushing piston, 36, a piston cap, 37, a piston rod, 40, a friction plate assembly, 41, a friction moving plate, 42, a friction static plate, 43, a disc spring, 44, teeth, 45, a tooth socket, 46, a rectangular protrusion, 47 and a rectangular groove.
Detailed Description
The invention will be further explained with reference to the drawings.
FIG. 1 schematically illustrates a progressive cavity tool face stabilizer according to one embodiment of the present invention. The screw drill tool face stabilizer according to the invention can be used for directional drilling and composite drilling.
As shown in fig. 1, the helicoidal drill tool face stabilizer of the present embodiment includes a housing 10. The housing 10 is cylindrical. The short section of the embodiment further comprises a mandrel 20, and the middle part of the mandrel 20 is sleeved in the shell 10. Further, one end of the mandrel 20 is connected to the drill pipe through a standard drill pipe pin, and the other end is connected to the drill pipe or the screw drill through a lower joint 22. The sub of the present embodiment further comprises a borehole wall friction assembly 30, wherein the borehole wall friction assembly 30 is configured to enable the casing 10 to generate friction with a borehole wall. The short joint of the embodiment further comprises a friction plate assembly 40, wherein the friction plate assembly 40 is configured to generate friction force between the outer shell 10 and the mandrel 20.
In use of the screw drill tool face stabilizer according to the plate embodiment, the borehole wall friction assembly 30 provides friction between the casing and the borehole wall, securing the casing within the borehole wall. The friction plate assembly 40 creates friction between the outer shell and the spindle. During directional drilling, the screw drill generates reaction torque and transmits the reaction torque to the mandrel 20, and the friction force generated by the friction plate assembly 40 between the mandrel 20 and the shell 10 is greater than the reaction torque, so that the mandrel 20 is ensured not to rotate under the action of the reaction torque, and the stability of a tool face is ensured. During composite drilling, the rotary table drives the drill string, the mandrel 20 and the screw to rotate together. Because the torsional force of the rotary table driving the drill string and the mandrel 20 is greater than the friction force generated by the friction plate assembly 40 and less than the friction force generated by the well wall friction assembly 30, the friction plates still rub, the mandrel 20 rotates in the outer shell 10, but the outer shell 10 and the well wall are kept still, so that the well wall is prevented from collapsing.
In one embodiment, the mandrel 20 is provided with a pressure transfer hole 21 along the radial direction, and the outlet of the pressure transfer hole 21 is aligned with the inner wall of the housing 10. In this embodiment, the drilling fluid flows within the mandrel 20 and is transmitted between the housing 10 and the mandrel 20 through the pressure transmitting holes 21. The pressure of the drilling fluid is applied to the wellbore wall friction assembly 30 to control the friction between the well casing 10 and the wellbore wall.
In a preferred embodiment, as shown in FIG. 2, the sidewall friction assembly 30 includes a radial bore 31 extending through the outer wall of the housing 10, and a thrust piston 34 sealingly disposed within the radial bore 31. Preferably, the number of the radial holes 31 is three, and the radial holes are uniformly arranged on the circumference of the outer wall of the housing 10. In operation of the sidewall friction assembly 30 according to the present embodiment, drilling fluid is communicated between the casing 10 and the mandrel 20 through the pressure transfer holes 21 through the mandrel 20. The push piston 34 extends outward along the radial bore 31 under the pressure of the drilling fluid, thereby bringing the push piston 34 into contact with the borehole wall and creating friction.
In a preferred embodiment, the radial bore 31 includes an inner section 32 proximate to one end of the mandrel 20 and an outer section 33 distal to one end of the mandrel 20. Wherein the diameter of the inner section 32 is larger than the diameter of the outer section 33. Further, the push piston comprises a piston cap 36 movable in the inner section 32, and a piston rod 37 movable in the outer section 33. Wherein the piston cap 36 has a diameter greater than the diameter of the outer section 33. Thus, the push piston cannot slide out of the radial hole 31. Further, the two ends of the housing 10 are connected to the spindle 20 through sealing devices 13.
In order to increase the friction force of the borehole wall friction assembly 30 and to fix the casing 10 in the borehole wall when using the tool face stabilizer of the screw drill according to the present embodiment, the flow rate of the drilling fluid may be increased first, so that the drilling fluid is transmitted between the casing 10 and the mandrel 20 through the pressure transmitting hole 21. The pushing piston extends outward along the radial hole 31 under the push of the drilling fluid. The end of the push piston extends out of the housing 10 and presses against the borehole wall. Thereby securing the housing 10 within the borehole wall.
In one embodiment, as shown in fig. 1 and 3, the housing 10 is cylindrical, and an annular groove 11 is formed at one end of the inner cavity of the housing 10, and the outer end of the annular groove 11 is sealed by a sealing cover 12. Preferably, the housing 10 is divided into two sections, a section near the screw drill and a section far from the screw drill. Wherein, a section close to the screw drill is at the lower end in work and is provided with an annular groove 11. For mounting friction plate assembly 40. The section far away from the screw drill is at the upper end in work and is used for installing a well wall friction assembly 30. The outer casing 10 of this embodiment is divided into two sections so that the friction plate assembly 40 and the borehole wall friction assembly 30 are arranged in different positions and are not affected by each other.
In one embodiment, as shown in fig. 1 and 3, the friction plate assembly 40 includes a plurality of friction plates 41. The friction rotor 41 is provided on the outer wall of the spindle 20, and is capable of rotating with the rotation of the spindle 20. In a preferred embodiment, as shown in FIG. 4, the friction rotor 41 is provided with teeth 44 on its inner periphery and the spindle 20 is provided with splines 45 on its outer periphery for mating with the friction rotor 41. In this embodiment, the friction plate assembly 40 further includes a plurality of friction static plates 42, and the friction static plates 42 are fixed on the inner wall of the outer shell 10. In a preferred embodiment, as shown in fig. 5, the friction stator 42 is provided with at least three rectangular protrusions 46 at its outer edge and the same number of rectangular recesses 47 in the inner wall of the housing 10. The rectangular protrusion 46 is fixed in the rectangular groove 47. In the friction plate assembly 40 of the present embodiment, the surfaces of the static friction plate 42 and the dynamic friction plate 41 are rough. The static friction plate 42 and the dynamic friction plate 41 are arranged at intervals.
In one embodiment, the friction plate assembly 40 further includes a disc spring 43. The disc spring 43 is disposed between the spindle 20 and the housing 10. One end of the disc spring 43 is connected to the end of the housing 10, and the other end is connected to the friction plate 41. In this embodiment, the disc spring 43 presses the static friction plate 42 to make the static friction plate 42 close to the dynamic friction plate 41, thereby increasing the friction force of the friction plate assembly 40.
In one embodiment, two positioning bolts 23 are provided on the core shaft 20, and the two positioning bolts 23 are respectively provided on both sides of the housing 10. The positioning bolt 23 is used to position the connection position of the housing 10 and the spindle 20, and ensure that the housing 10 does not separate from the spindle 20.
The invention relates to a method for drilling by using a tool face stabilizer of a screw drill. Which comprises the following steps.
First, the above-described screw drill tool face stabilizer is assembled and installed upstream of the screw drill.
During directional drilling, the borehole wall friction assembly 30 generates friction between the casing 10 and the borehole wall, so that the casing 10 is in a static state. The friction force of the friction plate assembly 40 is increased, so that the mandrel 20 and the outer shell 10 are in a relative static state. At this time, when the reaction torque of the screw drill is transmitted to the spindle 20, the friction force generated by the friction plate prevents the movement of the spindle 20. Thereby maintaining the stability of the tool face of the screw drill.
In the composite drilling, the wall friction assembly 30 generates friction between the casing 10 and the wall of the borehole, so that the casing 10 is in a static state. The rotary table drives the drill column, the mandrel and the screw rod to rotate together. Because the torsional force of the rotary table driving the drill string and the mandrel is greater than the friction force generated by the friction plate assembly 40 and less than the friction force generated by the well wall friction assembly 30, the friction plates still rub, the mandrel 20 rotates in the outer shell 10, but the outer shell 10 and the well wall are kept still, so that the well wall is prevented from collapsing.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (7)
1. A screw drill tool face stabilizer, comprising:
a housing (10) for holding a plurality of components,
a mandrel (20), wherein the mandrel (20) penetrates through the shell (10) and two ends of the mandrel are positioned outside the shell (10);
a well wall friction assembly (30) arranged on the outer shell (10), wherein the well wall friction assembly (30) is configured to enable the outer shell (10) to generate friction force with a well wall, the well wall friction assembly (30) comprises a radial hole (31) penetrating through the outer wall of the outer shell (10), and a pushing piston (34) arranged in the radial hole (31) in a sealing mode; the radial bore (31) comprises an inner section (32) near the centre of the mandrel (20) and an outer section (33) remote from the centre of the mandrel (20), wherein the diameter of the inner section (32) is greater than the diameter of the outer section (33); and
a friction plate assembly (40) disposed between the outer shell (10) and the mandrel (20), the friction plate assembly (40) configured to enable friction between the outer shell (10) and the mandrel (20);
wherein the push piston comprises a piston cap (36) movable in the inner section (32), and a piston rod (37) movable in the outer section (33); the push piston (34) extends outwardly along the radial bore (31) under pressure of the drilling fluid.
2. The positive displacement drill tool face stabilizer according to claim 1, characterized in that a pressure transfer hole (21) is provided in the mandrel (20) in a radial direction, and the outlet of the pressure transfer hole (21) is aligned with the inner wall of the housing (10).
3. The screw drill tool face stabilizer according to claim 1 or 2, characterized in that the housing (10) is cylindrical, an annular groove (11) is provided at one end of the inner cavity of the housing (10), and the annular groove (11) is sealed by a sealing cover (12);
wherein the friction plate assembly (40) is disposed within the annular groove (11).
4. The screw drill tool face stabilizer according to claim 3, characterized in that the friction plate assembly (40) comprises a plurality of friction dynamic plates (41) disposed on the outer wall of the mandrel (20) and a plurality of friction static plates (42) disposed on the inner wall of the housing (10); wherein the friction rotor (41) and the friction stator (42) are arranged at intervals.
5. The screw drill tool face stabilizer according to claim 4, characterized in that the friction plate assembly (40) further comprises a disc spring (43) disposed in the annular groove (11), one end of the disc spring (43) being connected to the end wall of the annular groove (11) and the other end being connected to the outermost friction plate (41).
6. The screw drill tool face stabilizer according to claim 1 or 2, characterized in that two positioning bolts (23) are provided on the mandrel (20), the two positioning bolts (23) being provided on both sides of the housing (10), respectively.
7. A progressive cavity tool face stabilizer according to claim 1 or 2, wherein both ends of the housing (10) are connected to the mandrel (20) by sealing means (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711056166.5A CN109750992B (en) | 2017-11-01 | 2017-11-01 | Screw drill tool face stabilizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711056166.5A CN109750992B (en) | 2017-11-01 | 2017-11-01 | Screw drill tool face stabilizer |
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| Publication Number | Publication Date |
|---|---|
| CN109750992A CN109750992A (en) | 2019-05-14 |
| CN109750992B true CN109750992B (en) | 2020-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711056166.5A Active CN109750992B (en) | 2017-11-01 | 2017-11-01 | Screw drill tool face stabilizer |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112943096B (en) * | 2021-03-10 | 2023-05-05 | 盘锦卓汇钻井技术开发有限责任公司 | Screw drilling tool reactive torque damper |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1239255A1 (en) * | 1984-06-20 | 1986-06-23 | Всесоюзный Ордена Трудового Красного Знамени Научно-Исследовательский Институт Буровой Техники | Centering device for hole-bottom motor |
| CN200949423Y (en) * | 2005-11-23 | 2007-09-19 | 中国石化集团中原石油勘探局钻井工程技术研究院 | Hydraulic reduced drilling tool stabilizer |
| CN102268961A (en) * | 2011-08-01 | 2011-12-07 | 西南石油大学 | Screw drill transmission shaft assembly with vibration reduction function |
| CN106437514A (en) * | 2016-10-18 | 2017-02-22 | 裴绪建 | Tool surface stabilizer |
| CN106895076A (en) * | 2015-12-18 | 2017-06-27 | 中国石油化工股份有限公司 | A kind of controllable bearing of moment of torsion |
-
2017
- 2017-11-01 CN CN201711056166.5A patent/CN109750992B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1239255A1 (en) * | 1984-06-20 | 1986-06-23 | Всесоюзный Ордена Трудового Красного Знамени Научно-Исследовательский Институт Буровой Техники | Centering device for hole-bottom motor |
| CN200949423Y (en) * | 2005-11-23 | 2007-09-19 | 中国石化集团中原石油勘探局钻井工程技术研究院 | Hydraulic reduced drilling tool stabilizer |
| CN102268961A (en) * | 2011-08-01 | 2011-12-07 | 西南石油大学 | Screw drill transmission shaft assembly with vibration reduction function |
| CN106895076A (en) * | 2015-12-18 | 2017-06-27 | 中国石油化工股份有限公司 | A kind of controllable bearing of moment of torsion |
| CN106437514A (en) * | 2016-10-18 | 2017-02-22 | 裴绪建 | Tool surface stabilizer |
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| CN109750992A (en) | 2019-05-14 |
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