Drill rod centralizer

Abstract

The utility model provides a drill rod centralizer, and belongs to the field of drilling equipment. The centralizer solves the problem that an existing centralizer is inconvenient to adapt to drill rods of different sizes. The drill rod centralizer comprises an inner sleeve and an outer sleeve which are connected together through a bearing, a protective sleeve is coaxially fixed to the upper portion of the inner sleeve, the outer sleeve is sleeved with the lower end of the protective sleeve, a nylon sleeve matched with the inner sleeve in shape and size is inserted into the inner sleeve, and the upper end of the nylon sleeve extends into the protective sleeve; an annular protruding shoulder is formed on the outer wall of the upper end of the nylon sleeve, an annular step is arranged on the inner wall of the protective sleeve, the annular step is composed of an annular side wall and an annular bottom wall, and a pressing piece enabling the annular protruding shoulder to be tightly pressed on the annular bottom wall is detachably fixed to the annular side wall. The drill rod centralizer is convenient to adapt to drill rods with different sizes.

Description

Technical Field

[0001] The utility model belongs to the field of drilling equipment, and relates to a centralizer, in particular to a drill pipe centralizer. Background Technique

[0002] The drill pipe centralizer is an important auxiliary tool in drilling operations, mainly used to solve the non-linearity and deflection problems of drill pipes during drilling, so as to improve drilling efficiency and safety.

[0003] Existing centralizers, such as a drill pipe centralizing mechanism for a drilling rig disclosed in the Chinese Patent Database (Application No.: 202222358707.2), include a centralizing sleeve bearing seat, a support cylinder bearing, a drill pipe support cylinder, a support cylinder top cover, a bearing bottom limit snap ring, and a bearing top limit snap ring. An installation chamber for the support cylinder is provided inside the centralizing sleeve bearing seat. The drill pipe support cylinder is installed inside the support cylinder installation chamber. The support cylinder bearing is nested outside the drill pipe support cylinder. The support cylinder top cover is arranged at the top of the drill pipe support cylinder, and a top cover fixing screw is embedded between the support cylinder top cover and the drill pipe support cylinder. The top cover fixing screw passes through the support cylinder top cover and is threadedly engaged with the drill pipe support cylinder. The support cylinder top cover and the drill pipe support cylinder are fixedly connected by the top cover fixing screw.

[0004] The above centralizing mechanism uses the drill pipe support cylinder to centralize the drill pipe. Since there are various sizes of drill pipes in actual use, it is necessary to replace the matching drill pipe support cylinder at this time. However, in the above centralizing mechanism, the drill pipe support cylinder is rotationally matched with the centralizing sleeve bearing seat through bearings, resulting in extremely inconvenient and laborious disassembly and assembly of the drill pipe support cylinder. Summary of the Utility Model

[0005] The purpose of the present utility model is to address the above problems existing in the prior art and propose a drill pipe centralizer that is convenient for adapting to drill pipes of different sizes.

[0006] The purpose of the present utility model can be achieved by the following technical solutions: A drill pipe centralizer includes an inner sleeve and an outer sleeve connected together through bearings. A protective sleeve is coaxially fixed above the inner sleeve, and the lower end of the protective sleeve is sleeved on the outer sleeve. It is characterized in that a nylon sleeve with a shape and size matching the inner sleeve is inserted into the inner sleeve, and the upper end of the nylon sleeve extends into the protective sleeve. An annular shoulder is formed on the outer wall of the upper end of the nylon sleeve, and an annular step is provided on the inner wall of the protective sleeve. The annular step is composed of an annular side wall and an annular bottom wall, and a pressing member for tightly pressing the annular shoulder against the annular bottom wall is detachably fixed on the annular side wall.

[0007] During use, the drill pipe is vertically inserted into the nylon sleeve. The nylon sleeve adheres to the outer wall of the drill pipe through its inner wall to keep the drill pipe in a vertical state, achieving centralization. At the same time, the nylon sleeve, inner sleeve, and outer sleeve rotate with the drill pipe.

[0008] This centralizer can adapt to drill pipes of different sizes only by replacing the type of nylon sleeve. During actual replacement, it only needs to disassemble and assemble the pressing part and insert and remove the nylon sleeve, which has the advantages of convenient and easy replacement.

[0009] In the above drill pipe centralizer, the above pressing part is an annular structure coaxial with the sheath, and the pressing part tightly presses on the top surface of the nylon sleeve to effectively increase the contact area between the pressing part and the nylon sleeve, thereby positioning the nylon sleeve more stably.

[0010] In the above drill pipe centralizer, the type of the pressing part is a circlip, and an annular groove for installing the circlip is formed on the above annular side wall. With the above design, it has the advantages of simple structure and reliable positioning.

[0011] As another solution, in the above drill pipe centralizer, the pressing part is provided with an external thread, and the annular side wall is correspondingly provided with an internal thread, and the pressing part is threadedly connected to the annular side wall. With the above design, the detachable fixation of the pressing part can also be realized.

[0012] In the above drill pipe centralizer, the upper end of the sheath presses on the top surface of the inner sleeve, and the upper end of the sheath is fixedly connected to the inner sleeve by a circle of vertically arranged screws.

[0013] In the above drill pipe centralizer, a convex ring is formed on the bottom surface of the sheath, and the convex ring is coaxial with the sheath. An annular guide groove matching the convex ring is formed on the top surface of the inner sleeve, and the convex ring is inserted into the guide groove. The cooperation of the convex ring and the guide groove plays a role in installation guidance and pre-connection, facilitating the connection between the inner sleeve and the sheath.

[0014] In the above drill pipe centralizer, the inner side walls at both ends of the nylon sleeve are both conical surfaces. The diameter of the conical surface on the upper side gradually decreases from top to bottom, and the diameter of the conical surface on the lower side gradually increases from top to bottom. The conical surfaces are provided for guiding the insertion of the drill pipe, facilitating the insertion of the drill pipe.

[0015] In the above drill pipe centralizer, the top surfaces of the annular shoulder and the nylon sleeve are flush with each other, which is beneficial to the installation of the circlip.

[0016] In the above drill pipe centralizer, the type of the above bearing is an angular contact bearing, enabling the centralizer to have a certain swing angle and better adapting to the working conditions.

[0017] Compared with the prior art, the present drill pipe centralizer has the following advantages:

[0018] 1. This centralizer can adapt to drill pipes of different sizes only by replacing the type of nylon sleeve. During actual replacement, it only needs to disassemble and assemble the pressing part and insert and remove the nylon sleeve, which has the advantages of convenient and easy replacement.

[0019] 2. The pressing part uses a circlip, which not only stably positions the nylon sleeve but also has the advantages of simple structure and convenient disassembly and assembly. Brief Description of the Drawings

[0020] Figure 1 is a three-dimensional schematic diagram of this drill pipe centralizer.

[0021] Figure 2 is a sectional schematic diagram of this drill pipe centralizer.

[0022] Figure 3 is a sectional schematic diagram of the outer sleeve.

[0023] In the figure, 1 is the inner sleeve; 2 is the outer sleeve; 2a is the connecting plate; 3 is the bearing; 4 is the sheath; 4a is the convex ring; 4b is the annular step; 4b1 is the annular side wall; 4b2 is the annular bottom wall; 5 is the screw; 6 is the nylon sleeve; 6a is the annular shoulder; 6b is the conical surface; 7 is the pressing part. Detailed Description of the Preferred Embodiments

[0024] The following are specific embodiments of the present invention and in combination with the attached drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments. Embodiment 1

[0025] As shown in Figure 1 and Figure 2 This drill pipe centralizer includes an inner sleeve 1 and an outer sleeve 2 arranged coaxially, and the inner sleeve 1 is located inside the outer sleeve 2. The inner sleeve 1 and the outer sleeve 2 are rotationally connected together through a bearing 3. Specifically, the bearing 3 is located between the inner ring and the outer ring, and the inner ring and the outer ring of the bearing 3 are fixedly connected to the inner sleeve 1 and the outer sleeve 2 respectively. Preferably, the type of the bearing 3 is an angular contact bearing, so that the centralizer has a certain swing angle and can better adapt to the working conditions.

[0026] Among them,

[0027] On both sides of the lower end of the outer sleeve 2, connecting plates 2a are formed, and bolt holes are vertically penetrated through the connecting plates 2a for the installation and positioning of the outer sleeve 2.

[0028] Above the inner sleeve 1, a sheath 4 is coaxially fixed. Specifically, the upper end of the sheath 4 presses on the top surface of the inner sleeve 1, and the upper end of the sheath 4 is fixedly connected to the inner sleeve 1 through a circle of vertically arranged screws 5. Further explanation, a convex ring 4a is formed on the bottom surface of the sheath 4, and the convex ring 4a and the sheath 4 are coaxially arranged. An annular guide groove matching the convex ring 4a is formed on the top surface of the inner sleeve 1, and the convex ring 4a is inserted into the guide groove. The cooperation of the convex ring 4a and the guide groove plays a role in installation guidance and pre-connection, facilitating the connection between the inner sleeve 1 and the sheath 4. Preferably, the axial cross-section of the guide groove is L-shaped, which is convenient for the design and processing of the guide groove.

[0029] As shown in Figure 2 and Figure 3As shown in the figure, the lower end of the sheath 4 is sleeved on the outer sheath 2 to form a shield on the outside of the outer sheath 2 to provide a certain degree of protection for the bearing 3. A nylon sleeve 6 with the same shape and size as the inner sleeve 1 is inserted into the inner sleeve 1. At this time, the outer side surface of the nylon sleeve 6 is attached to the inner side surface of the inner sleeve 1. The upper end of the nylon sleeve 6 extends into the sheath 4. An annular shoulder 6a is formed on the outer wall of the upper end of the nylon sleeve 6, and the annular shoulder 6a is coaxially arranged with the nylon sleeve 6. An annular step 4b is formed on the inner wall of the sheath 4, and the annular step 4b is coaxially arranged with the sheath 4. The annular step 4b is composed of an annular side wall 4b1 and an annular bottom wall 4b2, and a pressing member 7 for pressing the annular shoulder 6a against the annular bottom wall 4b2 is detachably fixed on the annular side wall 4b1.

[0030] During use, the drill pipe is vertically inserted into the nylon sleeve 6. The nylon sleeve 6 adheres to the outer wall of the drill pipe through its inner wall to keep the drill pipe in a vertical state, achieving the purpose of straightening. Moreover, the nylon sleeve 6, the inner sleeve 1, and the outer sleeve 2 rotate along with the drill pipe.

[0031] This straightener only needs to replace the type of the nylon sleeve 6 to adapt to drill pipes of different sizes. And during actual replacement, only the pressing member 7 needs to be disassembled and assembled, and the nylon sleeve 6 needs to be inserted and pulled out, which has the advantages of convenient and easy replacement.

[0032] Furthermore, the pressing member 7 is an annular structure coaxial with the sheath 4, and the pressing member 7 presses against the top surface of the nylon sleeve 6 to effectively increase the contact area between the pressing member 7 and the nylon sleeve 6, thereby positioning the nylon sleeve 6 more stably. Preferably, the type of the pressing member 7 is a circlip, and an annular groove for installing the circlip is formed on the annular side wall 4b1. With the above design, it has the advantages of simple structure and reliable positioning.

[0033] As Figure 2 shown in the figure, the inner side walls at both ends of the nylon sleeve 6 are both tapered surfaces 6b. The diameter of the upper tapered surface 6b gradually decreases from top to bottom, and the diameter of the lower tapered surface 6b gradually increases from top to bottom. The tapered surfaces 6b are provided for guiding the insertion of the drill pipe to facilitate the insertion of the drill pipe.

[0034] In the actual product, the top surfaces of the annular shoulder 6a and the nylon sleeve 6 are flush with each other, which is beneficial to the installation of the circlip. Embodiment 2

[0035] The structure and principle of this Embodiment 2 are basically the same as those of Embodiment 1. The difference is that: the pressing member 7 is provided with an external thread, and the annular side wall 4b1 is correspondingly provided with an internal thread, and the pressing member 7 is threadedly connected to the annular side wall 4b1. With the above design, the detachable fixation of the pressing member 7 can also be achieved.

[0036] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the art to which the present utility model pertains may make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. A drill pipe centralizer, comprising an inner sleeve (1) and an outer sleeve (2) connected together via a bearing (3), a sleeve (4) being coaxially fixed above the inner sleeve (1), and a lower end of the sleeve (4) being sleeved on the outer sleeve (2), characterized in that: A nylon sleeve (6) having a shape and size matching the inner sleeve (1) is inserted into the inner sleeve (1), and the upper end of the nylon sleeve (6) extends into the protective sleeve (4); an annular boss (6a) is formed on the outer wall of the upper end of the nylon sleeve (6); an annular step (4b) is formed on the inner wall of the protective sleeve (4); the annular step (4b) is composed of an annular side wall (4b1) and an annular bottom wall (4b2); and a pressing piece (7) is detachably fixed on the annular side wall (4b1) for pressing the annular boss (6a) tightly against the annular bottom wall (4b2).

2. The drill pipe centralizer according to claim 1, characterized in that: The pressing piece (7) is an annular structure coaxial with the sheath (4), and the pressing piece (7) is tightly pressed on the top surface of the nylon sleeve (6).

3. The drill pipe centralizer according to claim 2, characterized in that: The type of the pressing piece (7) is a retaining spring, and an annular groove for installing the retaining spring is provided on the annular side wall (4b1).

4. The drill pipe centralizer according to claim 2, characterized in that: The pressing piece (7) is provided with an external thread, the annular side wall (4b1) is correspondingly provided with an internal thread, and the pressing piece (7) and the annular side wall (4b1) are threadedly connected.

5. The drill pipe centralizer according to claim 1, characterized in that: The upper end of the protective sleeve (4) is pressed onto the top surface of the inner sleeve (1), and the upper end of the protective sleeve (4) is fixedly connected to the inner sleeve (1) via a circle of vertically arranged screws (5).

6. The drill pipe centralizer according to claim 5, characterized in that: A convex ring (4a) is formed on the bottom surface of the sleeve (4), and the convex ring (4a) and the sleeve (4) are coaxial. A guide groove in the shape of an annular ring and matching the convex ring (4a) is provided on the top surface of the inner sleeve (1), and the convex ring (4a) is inserted into the guide groove.

7. The drill pipe centralizer according to claim 1, characterized in that: The inner side walls at both ends of the nylon sleeve (6) are both conical surfaces (6b), the diameter of the conical surface (6b) on the upper side gradually decreases from top to bottom, and the diameter of the conical surface (6b) on the lower side gradually increases from top to bottom.

8. The drill pipe centralizer according to claim 3, characterized in that: The top surfaces of the annular boss (6a) and the nylon sleeve (6) are arranged flush with each other.

9. The drill pipe centralizer according to claim 1, characterized in that: The type of the bearing (3) is an angular contact bearing.

Images