CN203729934U - Expansion cone - Google Patents

Abstract

The utility model provides an expansion cone, include that a first section awl section of thick bamboo (1), a second section awl section of thick bamboo (2) and a third section awl section of thick bamboo (3) that connect gradually along the axis of this expansion cone are equipped with in this expansion cone along axial through-hole (4) that link up, and the external diameter of a first section awl section of thick bamboo (1) is less than the external diameter of a third section awl section of thick bamboo (3), and a second section awl section of thick bamboo (2) is oval spheroidal partial surface with the adjacent partial surface of a first section awl section of thick bamboo (1). The expansion cone is beneficial to reducing abrasion resistance in the expansion process, the strength of the expansion cone can be enhanced, the elasticity of the expansion cone is guaranteed, and the occurrence of accident conditions such as expansion cone fracture and excessive abrasion caused by long-distance expansion construction can be avoided.

Description

an expanding cone

technical field

The utility model relates to the field of oil exploitation equipment, in particular to an expansion cone used in an expansion pipe.

Background technique

Expandable pipe technology is a new technology that has been booming in recent years, and it can be applied to drilling, well completion, oil production, workover and other operations. The expansion tube subsidy technology is very mature at present, and expansion tube completion has become a relatively popular completion scheme recently. The expansion tube used as the completion casing is long in length, and the expansion operation is difficult, and the performance requirements of the expansion cone are higher. For example, Wear resistance, high strength, impact resistance, reliability, etc., not only must have sufficient elasticity to ensure the reliability of the impact resistance of the expanding cone, but also must have sufficient rigidity and wear resistance to ensure the completion of long-distance expansion actions . The working surface of the existing expansion cone tool is generally a conical surface, which is prone to built-up edge during work, and is a single material entity. The performance improvement of the expansion cone is mainly completed by optimizing the material and improving the heat treatment process. The existing expansion cone Shape and structure and the form of a single material entity are difficult to achieve.

Utility model content

In order to solve the technical problem that the expansion cone in the prior art is prone to produce built-up edge phenomenon. The utility model provides an expansion cone, which is helpful to reduce the friction resistance in the expansion process, can not only enhance the strength of the expansion cone, but also ensure the elasticity of the expansion cone, and can avoid the expansion cone rupture and excessive The occurrence of accidents such as excessive wear and tear.

The technical solution adopted by the utility model to solve the technical problem is: an expansion cone, including a first section of cone, a second section of cone and a third section of cone sequentially connected along the axis of the expansion cone, the expansion There is a through hole through the cone in the axial direction, the outer diameter of the first section of the cone is smaller than the outer diameter of the third section of the cone, and the part of the surface of the second section of the cone adjacent to the first section of the cone is an elliptical sphere part of the surface.

In a preferred embodiment, the expansion cone is installed in the expansion tube, and the included angle θ between the tangent of the partial surface of the elliptical sphere in contact with the expansion tube and the axis of the expansion tube is 13-15 degrees.

In a preferred embodiment, the part of the second section of the cone adjacent to the third section of the cone is cylindrical.

In a preferred embodiment, the outer diameter of the cylinder is smaller than the outer diameter of the third-stage cone.

In a preferred embodiment, a plurality of alloy blocks are arranged on the second section of the cone.

In a preferred embodiment, the bottom end of the alloy block is set inside the second section of the cone, and the top end of the alloy block is set outside the second section of the cone.

In a preferred embodiment, the part adjacent to the second section of the cone and the third section of the cone is cylindrical, the outer diameter of the cylinder is smaller than the outer diameter of the third section of the cone, and the alloy block exposes the second section of the cone. The length of the barrel portion is equal to the difference between the outer diameter of the barrel and the outer diameter of the third section cone.

In a preferred embodiment, the alloy block is cylindrical, and the axis of the cylinder is perpendicular to the axis of the expansion cone.

In a preferred embodiment, the compressive strength of the alloy block is greater than the compressive strength of the second section of the cone.

In a preferred embodiment, the third section of the cone is provided with at least one annular groove for placing a sealing ring.

The characteristics and advantages of the expansion cone of the present utility model are:

1. In the expansion cone of the present utility model, after the part of the surface adjacent to the second section of the cone and the first section of the cone is set as a part of the surface of the elliptical sphere, the expansion process of the expansion cone to the expansion tube will be eased, Part of the surface of the elliptical sphere transitions smoothly with the gauge section, and the expansion process moves forward along the sphere, which effectively eases the entire expansion process, thereby avoiding the phenomenon of built-up edge during the expansion process. The expansion cone effectively avoids the stress concentration on the cone surface, eases the expansion process, uniforms the expansion cone stress, and prevents the expansion cone from breaking.

2. The expansion cone of the present utility model changes the solid structure of the single material of the original expansion cone into a structure inlaid with a hard alloy block, adopts a matrix with strong elastoplasticity, inlays an alloy block with high hardness, and combines the properties of the two materials. It achieves the effects of anti-wear, impact resistance and high strength, and achieves more excellent performance of the expansion cone.

3. In the expansion cone of the present invention, the alloy blocks are arranged in a net shape on the expansion cone, so as to achieve the effect of full-cone expansion of the solid expansion cone, reduce the expansion contact area, and reduce the expansion friction.

4. In the expansion cone of the present invention, the gaps between the alloy blocks are filled with lubricating grease, which effectively improves the lubrication conditions of the expansion cone surface, reduces friction, and reduces expansion pressure.

Description of drawings

The expansion cone described in the utility model will be further described in detail below in conjunction with the accompanying drawings.

Fig. 1 is a front view of the expansion cone in the first embodiment.

Fig. 2 is a partial surface of the elliptical sphere corresponding to the second section of the cone cylinder of the expansion cone in the first embodiment.

Fig. 3 is a front view of the expansion cone in the second embodiment.

Fig. 4 is a sectional view along A-A direction in Fig. 3 .

Fig. 5 is a perspective view of an expansion cone in a second embodiment.

Wherein 1. first section of cone, 2. second section of cone, 3. third section of cone, 4. through hole, 5. alloy block, 6. annular groove.

Detailed ways

The expansion cone described in the utility model will be described in further detail below in conjunction with the accompanying drawings. An expansion cone, the expansion cone is cylindrical, including the first section of the cone 1, the second section of the cone 2 and the third section of the cone 3 connected in sequence along the axis of the expansion cone, the expansion cone is provided with The through hole 4 penetrating in the axial direction, the outer diameter of the first section of the cone 1 is smaller than the outer diameter of the third section of the cone 3, and the part of the surface of the second section of the cone 2 adjacent to the first section of the cone 1 is elliptical The partial surface of sphere, as shown in Figure 1, promptly the surface shape of the right section A of the second section cone cylinder 2 is a part of the surface of an ellipse sphere, as shown in Figure 1, right section A and the right section represented by the solid line in Figure 2 Corresponding to A, the dotted line in Fig. 2 represents the elliptical sphere where the right section A is located.

In the prior art, the working surface of the expansion cone is conical, and the conical surface and the gage section transition through rounded corners. The transitional rounded corners still have a cutting effect on the expansion tube, and built-up edge is prone to occur. The generation of built-up edge is not good for long-distance expansion. Secondly, the original expanding cone structure will form stress concentration in the fillet transition section during the expansion process, while the stress on the front end of the cone surface is small; the stress distribution of the expanding cone is uneven. All or part of the second section of the cone 2 can be set to a part of the elliptical sphere, after the part of the surface adjacent to the second section of the cone 2 and the first section of the cone 1 is set as a part of the ellipse, the expansion cone The expansion process of the expansion tube will be eased, the part of the surface of the elliptical sphere and the gauge section will transition smoothly, and the expansion process will move forward along the sphere, effectively relieving the entire expansion process, thereby avoiding the phenomenon of built-up edge during the expansion process.

In one embodiment, as shown in FIG. 4 , the expansion cone is installed in the expansion tube 7 , and the angle θ between the tangent of the partial surface of the elliptical sphere in contact with the expansion tube 7 and the axis of the expansion tube 7 is 13-15 degrees, that is, when the expansion cone penetrates the expansion tube 7 and starts to expand the expansion tube 7, the part surface of the elliptical sphere of the expansion cone first contacts the inner wall of the expansion tube 7 is a tangent point, and the angle θ between the tangent line at the tangent point and the axis of the expansion tube 7 is 13-15 degrees. The second section of the cone 2 includes two sections of the cone, as shown in Figure 1, the dotted line divides the second section of the cone 2 into the right section A and the left section B, and the second section of the cone 2 is in phase with the third section of the cone 3 The adjacent part is cylindrical, that is, the left section B is cylindrical. The outer diameter of the cylinder is slightly smaller than the outer diameter of the third stage cone 3 .

In one embodiment, a plurality of alloy blocks 5 are arranged on the second section of the cone 2 . The bottom end of the alloy block 5 is set inside the second section of the cone 2, and the top end of the alloy block 5 is set outside the second section of the cone 2, as shown in Fig. 3, Fig. 4 and Fig. 5 . The single material entity structure of the original expansion cone is changed into a structure embedded with cemented carbide block 5, and a matrix with strong elastoplasticity is used to inlay the alloy block 5 with high hardness. The properties of the two materials are combined to achieve wear resistance, impact resistance, High intensity effect. Finally, the alloy blocks are neatly arranged on the surface of the second-stage cone 2 in a manner similar to a hexagonal close-packed lattice, forming a full-scale circumferential structure in the axial direction, which can achieve the effect of full-cone expansion of the solid expansion cone.

In addition, the part adjacent to the second section of the cone 2 and the third section of the cone 3 is cylindrical, and the outer diameter of the cylinder is smaller than the outer diameter of the third section of the cone 3, that is, the outer diameter of the left section B in Fig. 1 The diameter is smaller than the outer diameter of the third section of the cone 3, and the length of the part of the alloy block 5 exposed to the second section of the cone 2 is equal to the difference between the outer diameter of the cylinder and the outer diameter of the third section of the cone 3, that is The length of the portion of the alloy block 5 exposed from the second section of the cone 2 is equal to the difference between the outer diameter of the left section B and the outer diameter of the third section of the cone 3 .

Preferably, the alloy block 5 is cylindrical, and the axis of the cylinder is perpendicular to the axis of the expansion cone. The compressive strength of the alloy block 5 is greater than that of the second section of the cone 2 . In addition, during the expansion process, the gap between the alloy blocks is filled with grease, which effectively improves the lubrication conditions of the expanding cone surface, reduces friction, and reduces expansion pressure. The third segment cone 3 is also provided with at least one annular groove 6 for placing a sealing ring.

The above is only a specific embodiment of the utility model, and it cannot limit the scope of utility model implementation, so the replacement of its equivalent components, or the equivalent changes and modifications made according to the patent protection scope of the utility model should still belong to areas covered by this patent. In addition, the technical features and technical features, technical features and technical solutions, and technical solutions and technical solutions in the utility model can be used in free combination.

Claims (10)

1. an expansion cone, it is characterized in that, comprise the first paragraph cone cylinder (1), second segment cone cylinder (2) and the 3rd section of cone cylinder (3) that connect successively along the axis of this expansion cone, in this expansion cone, be provided with the through hole (4) connecting vertically, the external diameter of first paragraph cone cylinder (1) is less than the external diameter of the 3rd section of cone cylinder (3), the part surface that the part surface that second segment cone cylinder (2) is adjacent with first paragraph cone cylinder (1) is oval-shaped ball.

2. expansion cone according to claim 1, is characterized in that: this expansion cone is located in expansion tube, and the angle theta between the tangent line that the part surface of its oval-shaped ball contacts with expansion tube and expansion tube axis is 13～15 degree.

3. expansion cone according to claim 1, is characterized in that: the part that second segment cone cylinder (2) is adjacent with the 3rd section of cone cylinder (3) is cylindrical shape.

4. expansion cone according to claim 3, is characterized in that: the external diameter of this cylinder is less than the external diameter of the 3rd section of cone cylinder (3).

5. expansion cone according to claim 1, is characterized in that: second segment cone cylinder (2) is provided with multiple alloy blocks (5).

6. expansion cone according to claim 5, is characterized in that: the bottom of alloy block (5) is arranged in second segment cone cylinder (2), and the top of alloy block (5) is arranged on outside second segment cone cylinder (2).

7. expansion cone according to claim 6, it is characterized in that: the part that second segment cone cylinder (2) is adjacent with the 3rd section of cone cylinder (3) is cylindrical shape, the external diameter of this cylinder is less than the external diameter of the 3rd section of cone cylinder (3), and the length that alloy block (5) exposes the part of second segment cone cylinder (2) equals the difference between the external diameter of this cylinder and the external diameter of the 3rd section of cone cylinder (3).

8. expansion cone according to claim 5, is characterized in that: alloy block (5) is for cylindrical, and the axis of this cylinder is perpendicular to the axis of this expansion cone.

9. expansion cone according to claim 5, is characterized in that: the compressive strength of this alloy block (5) is greater than the compressive strength of second segment cone cylinder (2).

10. expansion cone according to claim 1, is characterized in that: the 3rd section of cone cylinder (3) is provided with at least one for placing the annular groove (6) of sealing ring.