Forming die and method for integral elastic centralizer

Abstract

The invention relates to a forming die and method for an integral elastic centralizer. The forming die for the integral type elastic centralizer comprises a sleeve main body, the sleeve main body extends in the longitudinal direction, and a hollowed-out slit extending in the longitudinal direction is formed in the side wall of the sleeve main body; the positions of the pushing and pressing die petals correspond to the positions of the hollowed-out slits, and the pushing and pressing die petals are configured to be capable of at least partially retracting into the sleeve main body in the radial direction inwards through the hollowed-out slits and at least partially extending out of the sleeve main body in the radial direction outwards through the hollowed-out slits; the driving piece is constructed to be capable of being inserted into the sleeve main body in the longitudinal direction so as to drive the pushing and pressing die petals to at least partially extend out of the sleeve main body in the radial direction; wherein a rotating bearing is arranged between the driving piece and the pushing and pressing die petal, and the rotating bearing enables the driving piece and the pushing and pressing die petal to be in rolling fit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cementing tools, in particular to a forming die for a monolithic elastic centralizer. BACKGROUND

[0002] A centralizer is a commonly used cementing tool accessory, mainly used to keep the casing in the center of the wellbore and prevent the casing from being eccentric.

[0003] The monolithic elastic centralizer is a high-performance tool designed for modern complex and difficult drilling operations. Through integrated structural design, it fundamentally solves the structural weaknesses of traditional centralizers and has higher reliability and comprehensive performance in harsh working conditions.

[0004] The monolithic elastic centralizer is mainly made by laser cutting and single stamping or single bow piece multiple pressing. At present, the single stamping method is more efficient. However, this method has the following disadvantages. First, the resistance during the expansion of the cone is very large, and high-power equipment is needed to assist stamping, which consumes a lot of energy. Second, the stability of the die is poor, and the workpiece is easy to take out part of the die when demolding. Therefore, the die needs to be manually installed repeatedly, affecting the overall work efficiency. SUMMARY

[0005] To solve the above technical problems, the present application provides a forming die for a monolithic elastic centralizer, which can solve at least one of the above technical problems. The present application also provides a forming method for a monolithic elastic centralizer.

[0006] According to the first aspect of the present application, a forming die for a monolithic elastic centralizer is provided, comprising: a sleeve body extending in a longitudinal direction, a hollow slit extending in the longitudinal direction is configured on the side wall of the sleeve body; a push pressure die, the position of the push pressure die corresponds to the hollow slit, the push pressure die is configured to be at least partially retracted into the sleeve body radially inwardly through the hollow slit, and at least partially extended out of the sleeve body radially outwardly through the hollow slit; and a driving member, the driving member is configured to be inserted into the sleeve body in the longitudinal direction to drive the push pressure die to at least partially extend out of the sleeve body radially outwardly; wherein a rotary bearing is provided between the driving member and the push pressure die, the rotary bearing makes the driving member and the push pressure die in rolling fit.

[0007] By adding the rotating bearing between the driving member and the push mold segment, the cooperation between the driving member and the push mold segment is rolling cooperation when the driving member is inserted into the sleeve body. This can effectively reduce the resistance of the driving member insertion, thereby reducing the energy consumption of the processing process.

[0008] In a preferred embodiment, the rotating bearing is installed on the outside of the driving member, and / or the rotating bearing is installed on the inside of the push mold segment.

[0009] In a preferred embodiment, the push mold segment comprises an upper mold segment and a lower mold segment, the upper mold segment is located above the lower mold segment in the longitudinal direction; the upper end of the upper mold segment is hinged to the sleeve body, the lower end of the lower mold segment is hinged to the sleeve body, the lower end of the upper mold segment and the upper end of the lower mold segment are relatively rotatable; the rotating bearing is installed on the inside of the upper mold segment and / or the lower mold segment.

[0010] In a preferred embodiment, the lower end of the upper mold segment is configured with upper engagement teeth, the upper end of the lower mold segment is configured with lower engagement teeth, the upper engagement teeth and the lower engagement teeth are matched with each other to realize the relatively rotatable cooperation between the lower end of the upper mold segment and the upper end of the lower mold segment.

[0011] In a preferred embodiment, the upper engagement teeth and the lower engagement teeth are sharp teeth or round teeth.

[0012] In a preferred embodiment, the rotating bearing installed on the upper mold segment is close to the lower end of the upper mold segment, and / or the rotating bearing installed on the lower mold segment is close to the upper end of the lower mold segment.

[0013] In a preferred embodiment, the inside of the upper mold segment and / or the lower mold segment is configured with a bearing installation groove, the rotating bearing is partially contained in the bearing installation groove and partially protrudes radially inward relative to the inside surface of the upper mold segment and / or the lower mold segment, the rotating bearing can rotate relative to the upper mold segment and / or the lower mold segment by the tangential passing of the bearing pin through the upper mold segment and / or the lower mold segment and the rotating bearing.

[0014] In a preferred embodiment, a mold segment pin hole extending in the tangential direction is configured at the upper end of the upper mold segment and / or the lower end of the lower mold segment, a body pin hole corresponding to the mold segment pin hole is configured on the cylindrical body, and the upper end of the upper mold segment and / or the lower end of the lower mold segment is hinged to the cylindrical body by the mold segment pin passing through the mold segment pin hole and the body pin hole.

[0015] In a preferred embodiment, the upper end surface of the upper mold segment and / or the lower end surface of the lower mold segment is configured with a limiting surface which is configured to abut against the cylindrical body when the upper mold segment and / or the lower mold segment is retracted radially inward.

[0016] In a preferred embodiment, the upper end face of the upper die half and / or the lower end face of the lower die half is further configured with a relief face, which is connected to the stop face and is radially outside the stop face, and which forms an angle with the stop face, and which is configured to avoid the upper die half and / or the lower die half from abutting against the cylindrical body when the upper die half and / or the lower die half is radially extended outward.

[0017] According to a second aspect of the present application, a forming method for the integral elastic centralizer is provided, which can be performed by using the forming die for the integral elastic centralizer as described above. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be described in more detail below with reference to the drawings. In the drawings: Figure 1 A schematic structural view of a forming die for an integral elastic centralizer according to an embodiment of the present application is shown, which is in a forming state; Figure 2 A schematic structural view of a forming die for an integral elastic centralizer according to an embodiment of the present application is shown, which is in a preparation state; Figure 3 A schematic structural view of the cylindrical body of the forming die in Figure 1 is shown; Figure 4 A schematic structural view of the upper die half of the forming die in Figure 1 is shown; Figure 5 A schematic structural view of the lower die half of the forming die in Figure 1 is shown; Figure 6 An embodiment of an integral elastic centralizer which can be manufactured by using the forming die and the forming method of the present application is shown.

[0019] In the drawings, the same components are designated by the same reference numerals. The drawings are not drawn according to the actual scale. DETAILED DESCRIPTION

[0020] The present application will be described in more detail below with reference to the drawings. In the drawings:

[0021] Figure 1 A forming die for an integral elastic centralizer (hereinafter referred to as “forming die”) 100 according to an embodiment of the present application is shown.

[0022] As shown in Figure 1 and Figure 3As shown, the molding die 100 includes a sleeve body 110. The sleeve body 110 extends in the longitudinal direction. A plurality of longitudinally extending, circumferentially spaced, openwork slits 1101 are formed on the side wall of the sleeve body 110. That is, the sleeve body 110 includes an upper ring portion, a lower ring portion longitudinally spaced from the upper ring portion, and a plurality of support ribs 1102 extending between the upper and lower ring portions. The plurality of support ribs 1102 are evenly spaced in the circumferential direction to form corresponding openwork slits 1101 between adjacent support ribs 1102. The lower ring portion can be connected to the base 140.

[0023] like Figure 1 and Figure 2 As shown, the molding die 100 also includes a drive member 130. The drive member 130 is longitudinally insertable into the sleeve body 110. The drive member includes a longitudinally extending insertion portion 131 and a limiting protrusion 132 connected to the upper longitudinal end of the insertion portion 131. The limiting protrusion 132 extends radially outward relative to the insertion portion 131. When the drive member 130 is fully inserted into the sleeve body 110, the limiting protrusion 132 abuts against the upper end of the sleeve body 110 to prevent the drive member 130 from being inserted further downward.

[0024] The molding die 100 also includes a pressing die flap 120. The pressing die flap 120 is positioned corresponding to the slit. The pressing die flap 120 can be at least partially radially retracted into the sleeve body 110 via the slit 1101, and can also be at least partially radially extended outward from the sleeve body 110 via the slit 1101. The pressing die flap 120 includes an upper die flap 121 and a lower die flap 122. The upper die flap 121 is located longitudinally above the lower die flap 122.

[0025] like Figure 1 and Figure 4 As shown, the upper mold lobe 121 includes an arc-shaped outer arc surface 1211 for engaging with the blank of the stabilizer to form the stabilizer. The upper mold lobe 121 also includes an outer plane 1212 located longitudinally above and connected to the outer arc surface 1211. The upper mold lobe 121 also includes an arc-shaped inner arc surface 1213, and a limiting surface 1214 and a clearance surface 1215 located at its upper end. The limiting surface 1214 abuts against the upper ring portion of the cylindrical body 110 when the upper mold lobe 121 retracts radially inward. The clearance surface 1215 is connected to the limiting surface 1214 and is located radially outside the limiting surface 1214. An angle exists between the clearance surface 1215 and the limiting surface 1214, thereby preventing the upper mold lobe 121 from abutting against the upper ring portion of the cylindrical body 110 when the upper mold lobe 121 extends radially outward.

[0026] The upper end of the upper die segment 121 is further configured with a tangential die segment pin hole 1216. The cylindrical body 110 is configured with a body pin hole 1103 corresponding to the die segment pin hole 1216. Figure 3 The die segment pin can pass through the die segment pin hole 1216 and the body pin hole 1103 to hinge the upper end of the upper die segment 121 with the cylindrical body 110, allowing the upper die segment 121 to rotate in the radial direction around the die segment pin.

[0027] As shown in Figure 4 , a rotary bearing 1219 is mounted on the inner side of the upper die segment 121. The rotary bearing 1219 can rotate relative to the upper die segment 121. Specifically, the inner side of the upper die segment 121 is configured with a bearing mounting groove. The rotary bearing 1219 is partially accommodated in the bearing mounting groove and partially protrudes radially inward relative to the inner side surface (inner arc surface 1213) of the upper die segment 121. A bearing pin hole 1217 is configured at a corresponding position of the upper die segment 121. By passing a bearing pin tangentially through the bearing pin hole 1217 and the rotary bearing 1219, the rotary bearing 1219 can rotate relative to the upper die segment 121.

[0028] Thus, when the driving member 130 is inserted, the insertion portion 131 of the driving member 130 can engage with the rotary bearing 1219. With the insertion of the insertion portion 131 of the driving member 130, the rotary bearing 1219 is in rolling engagement with the insertion portion 131, and the upper die segment 121 is pushed by the insertion portion 131 to move radially outward. In this process, since the rotary bearing 1219 is in rolling engagement with the insertion portion 131, the insertion resistance of the insertion portion 131 can be greatly reduced. This is conducive to reducing the energy consumption of the insertion of the insertion portion 131.

[0029] Preferably, the installed rotary bearing is close to the lower end of the upper die segment 121. Thanks to the leverage effect, the insertion resistance of the insertion portion 131 can be further reduced.

[0030] As shown in Figure 1 and Figure 5 , the lower die segment 122 includes an arc-shaped outer arc surface 1221 for engaging with the blank of the centralizer to form the centralizer. The lower die segment 122 further includes an outer flat surface 1222 located longitudinally below and connected to the outer arc surface 1221. The lower die segment 122 further includes an arc-shaped inner arc surface 1223, a limiting surface 1224 and a relief surface 1225 at the lower end. The limiting surface 1224 can abut against the lower end ring of the cylindrical body 110 when the lower die segment 122 is retracted radially inward. The relief surface 1225 is connected to the limiting surface 1224 and is radially outward of the limiting surface 1224. There is an included angle between the limiting surface 1224 and the relief surface 1225, so that the relief surface 1225 can avoid the lower die segment 122 from abutting against the lower end ring of the cylindrical body 110 when the lower die segment 122 is extended radially outward.

[0031] The lower end of the lower die half 122 is further configured with a tangential die half pin hole 1226. The cylindrical body 110 is configured with a body pin hole 1103 corresponding to the die half pin hole 1226. Figure 3 The die half pin can pass through the die half pin hole 1226 and the body pin hole 1103 to hinge the lower end of the lower die half 122 with the cylindrical body 110, allowing the lower die half 122 to rotate in the radial direction around the die half pin.

[0032] As shown in Figure 4 , a rotary bearing 1229 is mounted on the inner side of the lower die half 122. The rotary bearing 1229 can rotate relative to the lower die half 122. Specifically, the inner side of the lower die half 122 is configured with a bearing mounting groove. The rotary bearing 1229 is partially accommodated in the bearing mounting groove and partially protrudes radially inward relative to the inner side surface (inner arc surface 1223) of the lower die half 122. A bearing pin hole 1227 is configured at a corresponding position of the lower die half 122. By passing a bearing pin tangentially through the bearing pin hole 1227 and the rotary bearing 1229, the rotary bearing 1229 can rotate relative to the lower die half 122.

[0033] Thus, when the driving member 130 is inserted, the insertion portion 131 of the driving member 130 can engage with the rotary bearing 1229. With the insertion of the insertion portion 131 of the driving member 130, the rotary bearing 1229 is in rolling engagement with the insertion portion 131, and the lower die half 122 is pushed by the insertion portion 131 to move radially outward. During this process, since the rotary bearing 1229 is in rolling engagement with the insertion portion 131, the insertion resistance of the insertion portion 131 can be greatly reduced. This is beneficial to reduce the energy consumption of the insertion of the insertion portion 131.

[0034] Preferably, the installed rotary bearing is close to the upper end of the lower die half 122. Thanks to the leverage effect, the insertion resistance of the insertion portion 131 can be further reduced.

[0035] According to needs, the rotary bearing can also be mounted on the outer side of the insertion portion 131.

[0036] As shown in Figure 1 , Figure 4 , and Figure 5As shown, the lower end of the upper die half 121 is configured with an upper engaging tooth 1218, and the upper end of the lower die half 122 is configured with a lower engaging tooth 1228. The upper engaging tooth 1218 and the lower engaging tooth 1228 match each other. On one hand, this can achieve that the lower end of the upper die half 121 and the upper end of the lower die half 122 can be relatively rotatable, so that the upper die half 121 and the lower die half 122 can be smoothly extended radially outward and can be smoothly retracted radially inward. On the other hand, through the articulation between the upper end of the upper die half 121 and the cylindrical body 110, the articulation between the lower end of the lower die half 122 and the cylindrical body 110, and the engaging fit between the upper die half 121 and the lower die half 122, the structure of the upper die half 121 and the lower die half 122 is more stable, so that the upper die half 121 and the lower die half 122 can be avoided to be unexpectedly separated from the cylindrical body 110, or from the expected position. This can effectively improve the reliability of the forming die 100, and avoid manual repeated installation of the die. In this way, the forming die 100 can have higher working efficiency.

[0037] In Figure 1 , Figure 4 and Figure 5 the embodiment shown, the upper engaging tooth 1218 and the lower engaging tooth 1228 are pointed teeth. According to needs, the upper engaging tooth 1218 and the lower engaging tooth 1228 can also be round teeth or other types of teeth.

[0038] Figure 1 and Figure 2 shows a method for processing the centralizer leather material by using the above-mentioned forming die 100.

[0039] In Figure 2 the preparation state shown, the driving member 130 is outside the cylindrical body 110. At this time, the upper die half 121 and the lower die half 121 are not subjected to the radial outward thrust, and thus are in the radially inward retracted state. At this time, since the limiting surfaces 1214 and 1224 abut against the cylindrical body 110, the effective engagement of the upper engaging tooth 1218 and the lower engaging tooth 1228 can be ensured, so that the two die halves are avoided to be separated due to too large retraction angle.

[0040] The centralizer blank is sleeved outside the cylindrical body 110. Then, the driving member 130 is inserted into the cylindrical body 110 by means of the auxiliary stamping equipment. As Figure 1 shown, with the insertion of the driving member 130, the upper die half 121 and the lower die half 122 are gradually extended radially outward, and are deformed by pushing against the centralizer blank. The shapes of the outer cam surfaces 1211 and 1221 match the shape of the centralizer workpiece to be formed. Due to the existence of the avoiding surfaces 1215 and 1225, the die half pin can be avoided to be subjected to the pressure action of the driving member 130, so that the connection stability between the upper die half 121 and the lower die half 122 and the cylindrical body 110 can be improved, and the connection can be avoided to be damaged.

[0041] During or after insertion of the driving member 130, the centralizer blank can be heated to aid in forming.

[0042] After forming is complete, the driving member 130 can be removed from the tubular body 110. The upper die half 121 and the lower die half 122 retract radially inward, losing internal thrust, back to Figure 2 the illustrated state.

[0043] Thereafter, the formed centralizer workpiece can be removed from the forming die 100. Figure 6 An embodiment of a unitary, resilient centralizer 200 that can be formed by the above-described forming die 100 and method is shown.

[0044] In this document, "longitudinal", "circumferential", and "radial" are with respect to the longitudinal axis of the tubular body 110. "Radially inward" refers to a direction pointing toward or toward the axis of the tubular body 110. "Radially outward" refers to a direction away from the axis of the tubular body 110.

[0045] While the present application has been described with reference to the preferred embodiments, the application is not limited to the preferred embodiments but can be variously modified without departing from the scope of the application. That is, the technical features mentioned in each of the embodiments can be arbitrarily combined as long as there is no structural conflict. The application is not limited to the specific embodiments disclosed herein but includes all technical solutions falling within the scope of the claims.

[0046] List of reference signs

Claims

1. A molding die for an integral elastic centralizer, comprising: A sleeve body, the sleeve body extending in the longitudinal direction, and a hollow slit extending in the longitudinal direction is formed on the side wall of the sleeve body; The pushing mold flap is positioned corresponding to the hollow slit. The pushing mold flap is configured to retract radially inward into the sleeve body at least partially through the hollow slit and extend radially outward from the sleeve body at least partially through the hollow slit. as well as A drive member configured to be inserted longitudinally into the sleeve body to drive the pressing die flap to extend at least partially radially outward from the sleeve body; A rotary bearing is provided between the driving component and the pressing die, and the rotary bearing enables a rolling fit between the driving component and the pressing die.

2. The molding die for an integral elastic centralizer according to claim 1, characterized in that, The rotary bearing is mounted on the outside of the drive member, and / or the rotary bearing is mounted on the inside of the push-up mold.

3. The molding die for an integral elastic centralizer according to claim 1 or 2, characterized in that, The pushing die includes an upper die and a lower die, with the upper die positioned longitudinally above the lower die. The upper end of the upper mold lobe is hinged to the sleeve body, the lower end of the lower mold lobe is hinged to the sleeve body, and the lower end of the upper mold lobe and the upper end of the lower mold lobe can rotate relative to each other. The rotary bearing is installed on the inner side of the upper and / or lower mold lobe.

4. The molding die for an integral elastic centralizer according to claim 3, characterized in that, The lower end of the upper mold lobe is provided with upper meshing teeth, and the upper end of the lower mold lobe is provided with lower meshing teeth. The upper meshing teeth and the lower meshing teeth match each other to achieve a relative rotatable engagement between the lower end of the upper mold lobe and the upper end of the lower mold lobe.

5. The molding die for an integral elastic centralizer according to claim 4, characterized in that, The upper and lower meshing teeth are pointed or round teeth.

6. The molding die for an integral elastic centralizer according to any one of claims 3 to 5, characterized in that, The rotary bearing installed on the upper mold lobe is located near the lower end of the upper mold lobe, and / or the rotary bearing installed on the lower mold lobe is located near the upper end of the lower mold lobe.

7. The molding die for an integral elastic centralizer according to any one of claims 3 to 6, characterized in that, The inner side of the upper mold lobe and / or the lower mold lobe is provided with a bearing mounting groove. The rotary bearing is partially accommodated in the bearing mounting groove and partially protrudes radially inward relative to the inner side of the upper mold lobe and / or the lower mold lobe. A bearing pin passes tangentially through the upper mold lobe and / or the lower mold lobe and the rotary bearing, so that the rotary bearing can rotate relative to the upper mold lobe and / or the lower mold lobe.

8. The molding die for an integral elastic centralizer according to any one of claims 3 to 7, characterized in that, A tangentially extending mold lobe pin hole is constructed at the upper end of the upper mold lobe and / or the lower end of the lower mold lobe. A body pin hole corresponding to the mold lobe pin hole is constructed on the cylindrical body. The mold lobe pin can pass through the mold lobe pin hole and the body pin hole to hinge the upper end of the upper mold lobe and / or the lower end of the lower mold lobe to the cylindrical body.

9. The molding die for an integral elastic centralizer according to any one of claims 3 to 8, characterized in that, The upper end face of the upper mold lobe and / or the lower end face of the lower mold lobe are configured with limiting surfaces, which are configured to abut against the cylindrical body when the upper mold lobe and / or the lower mold lobe retracts radially inward.

10. The molding die for an integral elastic centralizer according to claim 9, characterized in that, The upper end face of the upper mold lobe and / or the lower end face of the lower mold lobe are further provided with a clearance surface. The clearance surface is connected to the limiting surface and is located radially outside the limiting surface. There is an angle between the clearance surface and the limiting surface. The clearance surface is configured to prevent the upper mold lobe and / or the lower mold lobe from abutting against the cylindrical body when the upper mold lobe and / or the lower mold lobe extend radially outward.

11. A molding method for an integral elastic centralizer, which can be performed using a molding die for an integral elastic centralizer according to any one of claims 1 to 10.

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