Drill bit with oscillating nozzle

Abstract

A drill bit with a swing nozzle comprises a drill bit body, a nozzle interface, a flow channel groove, a nozzle hole, a fixed blade, and a swing nozzle assembly. The swing nozzle assembly is installed in the flow channel groove, and the swing nozzle assembly comprises a fixed outer shell, a movable nozzle, an inner sleeve, an outer sleeve, a connecting rod, a pin shaft, and a spring. It is characterized in that: a swing nozzle assembly is installed on the drill bit body, the drill bit body has a nozzle hole, and the swing nozzle assembly is installed in the nozzle hole of the flow channel groove. Under the drive of the drilling fluid, the movable nozzle realizes reciprocating swing under the drive of the swing nozzle assembly. This structure enables the nozzle jet range to cover multiple cutting teeth, fully clean multiple cutting teeth, improve the rock carrying capacity of the drill bit, reduce the temperature of the cutting teeth, and increase the life of the drill bit and the drilling efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of drilling tools, in particular to a drill bit, specifically a drill bit with a swing nozzle. Background Art

[0002] The drill bit has high mechanical penetration rate, long service life and low drilling cost in soft to medium-hard formations, so it is widely used in drilling oil and gas wells. In the process of drilling in mudstone or bottom layers with high mud content, the drill bit needs to have good hydraulic performance to meet the needs of cuttings transportation and bottom hole cleaning during high-speed drilling. Summary of the invention

[0003] In view of the above problems, the present invention provides a drill bit with a swinging nozzle, which can fully clean the cutting teeth through the reciprocating swing of the movable nozzle, thereby achieving the purpose of improving the rock carrying capacity of the drill bit, reducing the temperature of the cutting teeth, increasing the life of the drill bit, and improving the drilling efficiency.

[0004] The technical solution of the present invention is as follows:

[0005] The drill bit of the prior art usually includes a drill body, fixed blades, water holes or fixed nozzles. The drill bit of this patent is different in that: a swing nozzle assembly is provided in the flow channel groove, and the swing nozzle assembly is installed in the nozzle hole of the flow channel groove.

[0006] In this patent, there is a swing nozzle assembly in the nozzle hole of the flow channel groove, and the swing nozzle assembly includes a fixed shell, a movable nozzle, an inner sleeve, an outer sleeve, a connecting rod, a pin and a spring. The drilling fluid flows into the inner sleeve chamber and pushes the inner sleeve to move. When the axial hole of the inner sleeve is blocked, the side hole of the inner sleeve is connected with the side inlet hole of the outer sleeve, and the drilling fluid flows into the outer sleeve chamber. A part of the drilling fluid flows out of the axial hole of the outer sleeve and pushes the outer sleeve to move, and a part of the drilling fluid flows out of the side outlet hole and pushes the inner sleeve to return to move. Then, the two sleeve side holes are disconnected, the axial hole of the inner sleeve is opened, and the drilling fluid continues to push the inner sleeve to move, achieving the reciprocating motion state of the inner and outer sleeves, and driving the reciprocating swing of the movable nozzle through the connecting rod. Through the reciprocating swing of the nozzle, the cutting teeth are fully cleaned, so as to improve the rock carrying capacity of the drill bit, reduce the temperature of the cutting teeth, increase the life of the drill bit, and improve the drilling efficiency.

[0007] As a preferred embodiment, the movable nozzle and the fixed housing form a rotating pair, and the movable nozzle swings back and forth in a plane.

[0008] As a preferred embodiment, the movable nozzle has a spray range of θ≤120°, and faces a cutting tooth position including a drill crown and a gauge section, so that a single swing nozzle assembly can clean multiple cutting teeth.

[0009] As a preferred embodiment, the internal flow channel of the movable nozzle is convergent, and the nozzle outlet can be elliptical, rectangular, circular, etc.

[0010] As a preferred mode, the inner sleeve of the swing nozzle assembly is arranged in the through hole of the outer sleeve, and the inner sleeve and the outer sleeve are connected to the movable nozzle through a connecting rod, and the two ends of the connecting rod are connected by pins. The structure is simple and reliable, and can adapt to the harsh environment underground.

[0011] As a preferred embodiment, the inner and outer sleeves are connected to the fixed outer shell through a spring, and the spring force helps the reciprocating motion of the inner and outer sleeves to be smoother, thereby increasing the stability of the overall system.

[0012] As a preferred embodiment, the inner sleeve contains an axial hole and a side hole, and the outer sleeve contains an axial hole, a side inlet hole and a side outlet hole. When the axial hole of the inner sleeve is opened and the side hole of the inner sleeve is disconnected from the side inlet hole of the outer sleeve, the inner sleeve is pushed to move axially. When the axial hole of the inner sleeve is closed and the side hole of the inner sleeve is connected to the side inlet hole of the outer sleeve, the drilling fluid of the inner sleeve flows into the outer sleeve and pushes the outer sleeve to move. It is necessary to ensure that the axial hole of the inner sleeve is completely blocked and the two side holes are connected, so that the inner and outer sleeves can achieve reciprocating motion.

[0013] As a preferred embodiment, a plurality of oscillating nozzle assemblies can be installed in the flow channel groove, and the oscillating directions thereof can be used in combination and can be the same or different to ensure that the cutting teeth can be cleaned in all directions and comprehensively.

[0014] The present invention is beneficial in that:

[0015] (1) The reciprocating swing of the nozzle can fully clean the cutting teeth on the fixed blade, thereby improving the rock carrying capacity of the drill bit, reducing the temperature of the cutting teeth, increasing the life of the drill bit, and improving the drilling efficiency.

[0016] (2) The swing nozzle assembly realizes nozzle swing through the flow of drilling fluid. It has a simple and reliable structure and does not require additional external energy input equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the external three-dimensional structure of a drill bit with a swing nozzle of the present invention;

[0018] Figure 2 It is a schematic diagram of the external three-dimensional structure of a drill bit used in combination with the multi-directional swing nozzle assembly of the present invention;

[0019] Figure 3 is a cross-sectional view of a drill bit provided with an oscillating nozzle;

[0020] Figure 4 is a cross-sectional schematic diagram of the swing nozzle assembly of the present invention;

[0021] Figure 5is a schematic diagram of a nozzle outlet of the present invention;

[0022] Figure 6 It is a three-dimensional structural schematic diagram of the fixed housing of the present invention;

[0023] Figure 7 It is a three-dimensional structural schematic diagram of the movable nozzle of the present invention;

[0024] Figure 8 It is a three-dimensional structural schematic diagram of the outer sleeve of the present invention;

[0025] Fig. 9 It is a three-dimensional structural schematic diagram of the inner sleeve of the present invention;

[0026] Fig.10 It is a three-dimensional structural schematic diagram of the connecting rod of the present invention;

[0027] Markings in the figure: 1-drill bit body; 2-fixed blade; 21-fixed blade PDC tooth; 3-swinging nozzle assembly; 31-fixed shell; 311-fixed shell flow channel; 312-plunger; 32-movable nozzle; 321-movable nozzle inlet; 322-movable nozzle pin hole; 33-inner sleeve; 331-inner sleeve side hole; 332-inner sleeve axial hole; 333-inner sleeve pin; 34-outer sleeve; 341-outer sleeve pin hole; 342-outer sleeve through hole; 343-outer sleeve side inlet hole; 344-outer sleeve axial hole; 345-outer sleeve side outlet hole; 35-inner sleeve spring; 36-outer sleeve spring; 37-connecting rod; 371-connecting rod pin hole Specific implementation plan

[0028] In order to facilitate the discussion of the application and working mode of the nozzle assembly, the present invention is explained using a PDC drill bit, but the patent is not limited to PDC drill bits, but also includes three-cone drill bits, impregnated drill bits, etc.

[0029] like Figure 1 , 2 As shown in Figures 3 and 4, a drill bit with a swing nozzle comprises a drill bit body, a nozzle interface, a flow channel groove, a nozzle hole, a fixed blade, and a swing nozzle assembly. The swing nozzle assembly is installed in the flow channel groove. The swing nozzle assembly comprises a fixed shell, a movable nozzle, an inner sleeve, an outer sleeve, a connecting rod, a pin and a spring. The characteristic is that the drill bit body is provided with a swing nozzle assembly, the drill bit body is provided with a nozzle hole, and the swing nozzle assembly is installed in the nozzle hole of the flow channel groove.

[0030] Preferably, the movable nozzle 32 and the housing 31 form a rotation pair, such as Figure 4 shown.

[0031] Preferably, the spray range of the movable nozzle covers multiple cutting teeth, the spray range is θ≤120°, and the facing cutting teeth position includes the drill crown and the gauge section, etc. Figure 2 shown.

[0032] As a preference, the flow channel inside the nozzle is convergent, such as Figure 4 shown.

[0033] As a preference, the nozzle outlet may be oval, rectangular, circular, etc. Figure 5 shown.

[0034] Preferably, an inner and outer sleeve are provided in the swing nozzle assembly, the inner sleeve 33 moves axially in the outer sleeve through hole 342, and the outer sleeve 34 moves axially in the fixed outer shell 31. Figure 4 , 6 , 8, and 9.

[0035] Preferably, two connecting rods 37 are provided in the swing nozzle assembly 4 to convert the axial repetitive movement of the inner and outer sleeves into the reciprocating swing of the movable nozzle. Figure 4 , 10 shown.

[0036] Preferably, the inner sleeve 33 and the outer sleeve 34 are connected to the fixed housing 31 via springs 35 and 36, respectively. Figure 4 shown.

[0037] Preferably, a plurality of swing nozzle assemblies can be installed in the flow channel groove, and the swing directions thereof can be used in combination and can be the same or different, such as Figure 2 shown.

[0038] As a preference, the reciprocating frequency and reciprocating angle of the movable nozzle can be adjusted by adjusting the length of the connecting rod, the eccentric distance of the through hole of the outer sleeve, and the size of the side hole. Figure 4 shown.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A drill bit with an oscillating nozzle, characterized in that: It includes a drill body, a nozzle interface, a flow channel groove, a nozzle hole, a fixed blade, and a swing nozzle assembly. The swing nozzle assembly is installed in the flow channel groove. The swing nozzle assembly includes a fixed shell, a movable nozzle, an inner sleeve, an outer sleeve, a connecting rod, a pin shaft, and a spring. In the swing nozzle assembly, the inner sleeve is arranged in the through hole of the outer sleeve, the inner sleeve and the outer sleeve are connected to the movable nozzle via a connecting rod, the two ends of the connecting rod are connected by pins, the movable nozzle (32) and the outer shell (31) form a rotating pair, the outer sleeve (34) moves axially in the fixed outer shell (31), two connecting rods (37) are arranged in the swing nozzle assembly (4), the axial repeated movement of the inner and outer sleeves is converted into the reciprocating swing of the movable nozzle, the inner sleeve (33) and the outer sleeve (34) are connected to the fixed outer shell (31) via springs (35, 36) respectively; A swing nozzle assembly is provided on the drill body, the drill body has a nozzle hole, and the swing nozzle assembly is installed in the nozzle hole of the flow channel groove; The movable nozzle and the fixed housing form a revolving pair, and the movable nozzle reciprocates in a plane; The internal flow channel of the movable nozzle is convergent, and the nozzle outlet is elliptical, rectangular or circular; A plurality of swing nozzle assemblies are installed in the flow channel groove, and the swing directions thereof are the same or different, and they can be used in combination.

2. A drill bit with an oscillating nozzle as claimed in claim 1, characterized in that: The spray range of the movable nozzle covers multiple cutting teeth, the spray range is θ≤120°, and the facing cutting tooth positions include the drill crown and the gauge section.

3. A drill bit with an oscillating nozzle as claimed in claim 1, characterized in that: The inner sleeve in the swing nozzle assembly is installed in the through hole of the outer sleeve. The inner sleeve and the outer sleeve are connected with the movable nozzle through a connecting rod, and the two ends of the connecting rod are connected by pins.

4. A drill bit with an oscillating nozzle as claimed in claim 1, characterized in that: The inner and outer sleeves are connected to the fixed outer shell through springs.

5. A drill bit with an oscillating nozzle as claimed in claim 1, characterized in that: The drilling fluid flows into the inner sleeve chamber and pushes the inner sleeve to move. When the axial hole of the inner sleeve is blocked, the side hole of the inner sleeve is connected with the side inlet hole of the outer sleeve, and the drilling fluid flows into the outer sleeve chamber. A part of the drilling fluid flows out of the axial hole of the outer sleeve and pushes the outer sleeve to move, and a part of the drilling fluid flows out of the side outlet hole and pushes the inner sleeve to return to motion. Subsequently, the two sleeve side holes are disconnected, the axial hole of the inner sleeve is opened, and the drilling fluid continues to push the inner sleeve to move, achieving a reciprocating motion state of the inner and outer sleeves, and driving the movable nozzle to swing back and forth through the connecting rod.

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