A kind of downhole casing protector and its manufacturing process

Abstract

The present invention discloses a supporting downhole casing protector and its manufacturing process, and relates to the technical field of casing protection. The present invention comprises a first protective flap and a second protective flap: the first protective flap and the second protective flap are connected to form a cylindrical structure by a plurality of bolts arranged in parallel; a plurality of pull plates: the pull plates are hinged between the first protective flap and the second protective flap; a plurality of balls: the balls are rollingly installed on the inner side of the first protective flap and the second protective flap; a plurality of weight-reducing grooves: a plurality of weight-reducing grooves are distributed on the first protective flap and the second protective flap; both ends of the cylindrical structure are provided with slope surfaces. The present invention connects the first protective flap and the second protective flap by rotating the pull plate, and adopts a structure connected by a pin and a pull plate, so that the opening of the protector is larger and the installation is more convenient; by providing slope angles at the upper and lower ends of the first protective flap and the second protective flap, the protector has no obstruction when entering and exiting the wellhead, and by installing the balls, the friction of the protector can be reduced when sliding.

Description

Technical Field

[0001] The invention belongs to the technical field of casing protection, and in particular relates to a supporting downhole casing protector and a manufacturing process thereof. Background Art

[0002] During the process of lowering the casing into the well, a casing centralizer is often used to ensure that the casing is located in the center of the wellbore and improve the cementing quality. The outside of the casing is the rock layer. When the optical fiber passes through the centralizer, it is usually tied and fixed with a cable tie, which cannot effectively protect the optical fiber and is not conducive to the safe lowering of the optical fiber into the well. In addition, during the process of lowering the casing into the well, shearing is easily formed between the centralizer and the well wall, cutting the optical fiber. Furthermore, when the casing or the centralizer rotates, the optical fiber will be twisted and broken.

[0003] At present, the elastic steel sheet of the elastic straightener is easily deformed, which leads to a reduction in the straightening effect or even the loss of the straightening effect. The straightener is generally composed of metal rollers and composite materials such as nylon. For example, Chinese patent CN211573422U discloses an internal pressure casing strong straightener. During the downhole process, the straightener is in an unopened state, and has a smaller outer diameter, so it has the advantage of small downhole resistance. When the screen needs to be straightened, the straightening assembly is opened, and the straightening assembly has a larger outer diameter, so as to achieve the straightening effect. Another example is Chinese patent CN211950381U discloses a fiber protection casing straightener to prevent the optical fiber from being cut or twisted during the casing lowering process. Chinese patent CN209115052U discloses an electric straightener to protect deep well equipment, which uses the straightening force to ensure that the feed rod is centered.

[0004] Chinese patents CN204633289U, CN104852342A, CN209430128U, etc., all disclose a downhole casing protection structure to straighten the casing, but the preparation process and structure are relatively complicated. Summary of the invention

[0005] The purpose of the present invention is to provide a supporting downhole casing protector and its manufacturing process. By adopting a two-petal protector, and the two petals are connected by bolts, balls are installed inside the two petals, and the two petals are subjected to weight reduction treatment, the problem that the existing protector preparation process and structure are relatively complicated is solved.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The present invention is a supporting downhole casing protector, comprising: a first protective flap and a second protective flap: the first protective flap and the second protective flap are connected to form a cylindrical structure by a plurality of bolts arranged in parallel; a plurality of pull plates: the pull plates are hinged between the first protective flap and the second protective flap; a plurality of balls: the balls are rollingly installed on the inner sides of the first protective flap and the second protective flap; a plurality of weight-reducing grooves: a plurality of weight-reducing grooves are distributed on the first protective flap and the second protective flap; both ends of the cylindrical structure are provided with slope surfaces, and the setting of the slope surfaces ensures that there is no obstruction when entering and exiting the wellhead.

[0008] Furthermore, one side of the first protective flap is provided with a plurality of connecting grooves arranged in parallel along its axial direction, and one end is provided with a pin hole penetrating the first protective flap and the connection; one side of the second protective flap is provided with a plurality of connecting grooves arranged in parallel along its axial direction, and one end is provided with a pin hole penetrating the second protective flap and the connection; the pull plate is installed in the connecting groove by means of pins, is locked by bolts, and is arranged equidistantly from top to bottom so that the protector is evenly stressed.

[0009] Furthermore, the pull plate is a rectangular plate with rounded corners on both sides. The length of the rectangular groove after the connecting grooves of the first protective petal and the second protective petal are spliced ​​is greater than the length of the pull plate. A structure of pin and pull plate connection is adopted, which makes the opening of the protector larger and easier to install.

[0010] Furthermore, the sides of the first protective flap and the second protective flap are provided with connecting holes in parallel, and the bolts pass through the connecting holes to connect the first protective flap and the second protective flap.

[0011] Furthermore, a first wire groove and a second wire groove are formed on the inner side of the first protective flap.

[0012] Furthermore, the weight-reducing groove includes a blind groove 1 and a blind groove 2, and the blind groove 1 and the blind groove 2 are respectively inclined on the peripheral side surfaces of the first protective flap and the second protective flap, and the inclination directions of the blind groove 1 and the blind groove 2 are opposite, thereby achieving maximum weight reduction.

[0013] Furthermore, the weight-reducing grooves also include a plurality of through grooves 1 and a plurality of through grooves 2, and the through grooves 1 and 2 are respectively opened on the peripheral side surfaces of the first protective flap and the second protective flap, thereby performing maximum weight reduction treatment on the first protective flap and the second protective flap.

[0014] Furthermore, the first protective flap is provided with an array of inclined holes one and two inclined holes along both sides of the blind groove one on its circumferential side, and the first protective flap is also provided with side holes located at its corners on its circumferential side; the second protective flap is provided with an array of inclined holes three and four inclined holes along both sides of the blind groove two on its circumferential side, and the second protective flap is also provided with side holes located at its corners on its circumferential side; balls are installed in the side holes, inclined holes one, inclined holes two, inclined holes three, and inclined holes four.

[0015] A manufacturing process of a downhole casing protector of a supporting structure, the manufacturing process is used to manufacture the protector; the manufacturing process includes process 1, and process 1 includes the following steps:

[0016] Step 1: Take a section of thick-walled pipe and rough and fine turn it to the required outer and inner circle sizes;

[0017] Step 2: Punching: Punch two pin holes at the ends of the pipe fittings, and punch several connecting holes side by side at the sides of the pipe fittings;

[0018] Step 3: Cut the pipe along its axial direction into a first protective flap and a second protective flap by wire cutting;

[0019] Step 4: drilling a side hole, an oblique hole 1, an oblique hole 2, an oblique hole 3, and an oblique hole 4 on the first protective flap and the second protective flap respectively;

[0020] Step 5: Cutting the first and second wire grooves along the axial direction of the inner side of the first protective flap by wire cutting;

[0021] Step 6: Weight reduction processing: Process through groove 1 and blind groove 1 on the first protective flap; process through groove 2 and blind groove 2 on the second protective flap;

[0022] Step 7: Carve out slope surfaces at both ends of the first protective flap and the second protective flap;

[0023] Step 8: Install the ball bearings on the side hole, the inclined hole 1, the inclined hole 2, the inclined hole 3 and the inclined hole 4 from the inner sides of the first protective flap and the second protective flap to make the protector.

[0024] Furthermore, the manufacturing process also includes process 2, which includes the following steps:

[0025] Step 1: Casting a first protective flap and a second protective flap;

[0026] Step 2: Punching: Punch two pin holes at the ends of the pipe fittings, and punch several connecting holes side by side at the sides of the pipe fittings;

[0027] Step 3: drilling a side hole, an oblique hole 1, an oblique hole 2, an oblique hole 3, and an oblique hole 4 on the first protective flap and the second protective flap respectively;

[0028] Step 4: Install the ball bearings on the side hole, the inclined hole 1, the inclined hole 2, the inclined hole 3 and the inclined hole 4 from the inner sides of the first protective flap and the second protective flap to make the protector.

[0029] The present invention has the following beneficial effects:

[0030] The present invention connects the first protective flap and the second protective flap by rotating a pull plate, and adopts a structure of pin and pull plate connection, so that the opening of the protector is larger and the installation is more convenient; by providing slope angles at the upper and lower ends of the first protective flap and the second protective flap, the protector has no obstruction when entering and exiting the wellhead, and the installed ball bearings can reduce friction when the protector slides.

[0031] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0033] Figure 1 It is a structural schematic diagram of the supporting downhole casing protector of the present invention;

[0034] Figure 2 It is a structural schematic diagram of the supporting downhole casing protector of the present invention;

[0035] Figure 3 It is a top view of the structure of the supporting downhole casing protector of the present invention;

[0036] Figure 4 It is a structural schematic diagram of the supporting downhole casing protector of the present invention;

[0037] Figure 5 It is a structural schematic diagram of the supporting downhole casing protector of the present invention;

[0038] Figure 6 is a schematic structural diagram of the first protective flap of the present invention;

[0039] Figure 7 It is a schematic structural diagram of the first protective flap of the present invention;

[0040] Figure 8 is a schematic structural diagram of the first protective flap of the present invention;

[0041] Fig. 9 is a schematic structural diagram of the second protective flap of the present invention;

[0042] Fig.10 is a schematic structural diagram of the second protective flap of the present invention;

[0043] Fig.11 is a schematic structural diagram of the second protective flap of the present invention;

[0044] Fig.12It is a structural schematic diagram of the supporting downhole casing protector of the present invention;

[0045] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0046] 1-first protective flap, 2-second protective flap, 3-pull plate, 4-connecting hole, 5-pin hole, 6-connecting slot, 101-side hole, 102-inclined hole one, 103-through slot one, 104-blind slot one, 105-inclined hole two, 106-wire slot one, 107-wire slot two, 201-blind slot two, 202-through slot two, 203-inclined hole four, 204-inclined hole three. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be understood that terms such as "opening", "upper", "lower", "inclined", "plane", "top", "middle", "equidistant", "inside", "all around", "side", "end", "side by side" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0049] Embodiment 1:

[0050] See also Figure 1-11 As shown, the present invention is a supporting downhole casing protector, comprising: a first protection flap 1 and a second protection flap 2: the first protection flap 1 and the second protection flap 2 are connected to form a cylindrical structure by a plurality of bolts arranged in parallel, and the casing is installed in the protector; Figure 1 As shown, there are 4 equidistantly arranged pull plates 3: the pull plates 3 are hinged between the first protective flap 1 and the second protective flap 2; a number of balls: the balls are rollingly installed on the inner sides of the first protective flap 1 and the second protective flap 2; a number of weight-reducing grooves: a number of weight-reducing grooves are distributed on the first protective flap 1 and the second protective flap 2; both ends of the cylindrical structure are provided with slope surfaces, and the setting of the slope surfaces ensures that there is no obstruction when entering and exiting the wellhead.

[0051] As an embodiment provided by the present invention, preferably, one side of the first protective flap 1 is provided with a plurality of connecting grooves 6 arranged in parallel along its axial direction, and one end is provided with a pin hole 5 penetrating the first protective flap 1 and connected; one side of the second protective flap 2 is provided with a plurality of connecting grooves 6 arranged in parallel along its axial direction, and one end is provided with a pin hole 5 penetrating the second protective flap 2 and connected; the pull plate 3 is installed in the connecting groove 6 by a pin, and the first protective flap 1 and the second protective flap 2 are locked with bolts and arranged equidistantly from top to bottom, so that the protector is evenly stressed, such as Figure 3 As shown, the edges of the first protective flap 1 and the second protective flap 2 where the pull plate 3 is located are both provided with rounded corners. Preferably, the distance between the two end surfaces of the first protective flap 1 and the second protective flap 2 is 8 mm, and the distance between the two end surfaces of the first protective flap 1 and the second protective flap 2 on the side where the bolt is located is 5 mm.

[0052] As an embodiment provided by the present invention, preferably, the pull plate 3 is a rectangular plate with rounded corners on both sides, and the length of the rectangular groove after the connecting grooves 6 of the first protective flap 1 and the second protective flap 2 are spliced ​​is greater than the length of the pull plate 3. A structure of connecting the pins and the pull plate 3 is adopted, so that the opening of the protector is larger and the installation is more convenient.

[0053] As an embodiment provided by the present invention, preferably, the sides of the first protective flap 1 and the second protective flap 2 are both provided with connecting holes 4 in parallel, and the bolts pass through the connecting holes 4 to connect the first protective flap 1 and the second protective flap 2.

[0054] As an embodiment provided by the present invention, preferably, a wire groove 106 and a wire groove 2 107 are provided on the inner side of the first protective flap 1 for installing signal lines, cables and the like.

[0055] Embodiment 2:

[0056] like Figure 1-11 As shown, the weight-reducing groove includes a blind groove 104 and a blind groove 201. The blind groove 104 and the blind groove 201 are respectively inclinedly opened on the peripheral side of the first protective flap 1 and the second protective flap 2, and the inclination directions of the blind groove 104 and the blind groove 201 are opposite, so as to achieve the maximum weight reduction. As an embodiment provided by the present invention, preferably, as Figure 3As shown, the groove depth of the blind groove 201 is 13.17mm. As a deep bevel groove, the angle between the starting point of the deep bevel groove opening (shown at point B) and the end face of the protective flap (shown at point A) is 55°, and the angle between the end point of the deep bevel groove and the end face of the protective flap (shown at point A) is 99°. The groove depth of the blind groove 104 is 1.42mm. As a shallow bevel groove, the angle between the starting point of the shallow bevel groove opening (shown at point D) and the end face of the protective flap (shown at point A) is 44°, and the angle between the end point of the shallow bevel groove (shown at point E) and the end face of the protective flap (shown at point A) is 109°. By setting the inclined blind groove 104 and the blind groove 201, on the one hand, the weight of the entire protector is reduced, the overall weight of the protector is reduced, and it is easy to use. Moreover, the inclination directions of the blind groove 104 and the blind groove 201 are opposite, which better balances the stresses in various directions on the protector and improves the service life of the protector.

[0057] As an embodiment provided by the present invention, preferably, the weight-reducing grooves further include a plurality of through grooves 103 and a plurality of through grooves 202, wherein the through grooves 103 and the through grooves 202 are respectively arranged on the peripheral side surfaces of the first protective flap 1 and the second protective flap 2, and the first protective flap 1 and the second protective flap 2 are subjected to the maximum weight-reducing treatment, such as Figure 7 As shown, there are three through slots 103, two of which are located in the blind slot 104 and at the upper and lower corners of the blind slot 104, further balancing the stress on the protector, and another through slot 103 is located on the peripheral side of the first protective petal 1 between the inclined hole 2 105 and the connecting hole 4, and the other two through slots 103 are respectively located at the three corners of the triangle, further balancing the stress on the protector, as shown in FIG. Fig.11 As shown, there are four through slots 202, two rectangular through slots 202 are located in the blind slot 201, and are located at the upper and lower sides of the blind slot 201, to further balance the stress on the protector, and another long strip through slot 202 is located on the peripheral side surface of the second protective petal 2 between the inclined hole three 204 and the connecting hole 4, and is respectively located at the three corners of the triangle with the other two rectangular through slots 202, to further balance the stress on the protector, and another triangular through slot 202 is located on the peripheral side surface of the second protective petal 2 between the inclined hole four 203 and the connecting slot 6, and is respectively located at the three corners of the triangle with the other two rectangular through slots 202, to further balance the stress on the protector, and the three through slots 103 and the four through slots 202 further reduce the weight of the protector to reduce the weight of the protector.

[0058] Embodiment three:

[0059] like Fig.12As shown, the circumferential side of the first protective flap 1 is provided with an array of inclined holes 102 and inclined holes 105 along both sides of the blind groove 104, and the circumferential side of the first protective flap 1 is also provided with side holes 101 located at its corners; as an embodiment provided by the present invention, preferably, the number of inclined holes 102 is 7, and when the hole center line of any inclined hole 102 and the end surface of the protective flap (as shown at A) are projected on the same horizontal plane, the angle between the two projection lines is 119°, and the number of inclined holes 105 is 7, and when the hole center line of any inclined hole 105 and the end surface of the protective flap (as shown at A) are projected on the same horizontal plane, the angle between the two projection lines is 39°. By setting the two inclined rows of inclined holes 102 and inclined holes 105, the balls in the inclined holes 102 and inclined holes 105 can disperse the friction in all directions, and reduce the mutual sliding between the protector and the sleeve caused by friction, so as to ensure that the two are always in a concentric position.

[0060] like Fig.12 As shown, the circumferential side of the second protective flap 2 is provided with array-arranged inclined holes three 204 and inclined holes four 203 along both sides of the blind groove two 201. As an embodiment provided by the present invention, preferably, the number of inclined holes four 203 is 7, and when the hole center line of any inclined hole four 203 and the end surface of the protective flap (as shown at A) are projected on the same horizontal plane, the angle between the two projection lines is 44°. The number of inclined holes three 204 is 7, and when the hole center line of any inclined hole three 204 and the end surface of the protective flap (as shown at A) are projected on the same horizontal plane, the angle between the two projection lines is 112°. By setting the two inclined rows of inclined holes three 204 and inclined holes four 203, the balls in the inclined holes three 204 and inclined holes four 203 can disperse the friction in all directions, and reduce the mutual sliding between the protector and the sleeve caused by friction, so as to ensure that the two are always in a concentric position.

[0061] As an embodiment provided by the present invention, preferably, the inclined hole 102, the inclined hole 105, the inclined hole 3 204, and the inclined hole 4 203 are all arranged in an equidistant array with equal spacing, and the spacing is: when the center lines of two adjacent inclined holes are projected to the same vertical plane, the distance between the two projection lines is 25 mm. The peripheral side of the second protective flap 2 is also provided with side holes 101 located at its corners, and there are 8 side holes 101 in total, 4 on each protective flap, which balance the stress on the protector while further increasing sliding and reducing friction; the side holes 101, the inclined hole 102, the inclined hole 105, the inclined hole 3 204, and the inclined hole 4 203 are all equipped with balls. Through the arrangement of the balls, the friction force in all directions of the peripheral side is guaranteed to be balanced, and local damage to the protector is avoided. There is no need to set balls at every location on the peripheral side, which reduces the number of balls used, has a simple structure, and reduces the probability of damage. Fig.12As shown, when the hole center line of the bypass hole 101 and the end surface of the protection flap (shown at A) are projected on the same horizontal plane, the angle between the two projection lines is 25°.

[0062] Embodiment 4:

[0063] A manufacturing process of a downhole casing protector comprising the following steps:

[0064] Step 1: Take a section of thick-walled pipe and rough-turn and fine-turn it to the required outer and inner circle sizes. Preferably, the inner circle diameter formed by the first protective flap 1 and the second protective flap 2 is 139.7 mm, and the outer circle diameter is 196 mm;

[0065] Step 2: Punching: Punch two pin holes 5 from the ends of the pipe fitting, preferably, the diameter of the pin hole 5 is 10 mm, the distance between the two pin holes 5 is 42 mm, and punch a number of connecting holes 4 side by side from the side of the pipe fitting, the center line of the connecting hole 4 is 87.4 mm away from the center line of the protective flap, and the center line of the connecting hole 4 is located on a circle with a diameter of 176, and four M10 bolts are used to connect the first protective flap 1 and the second protective flap 2, and the bolts are loosened so that the protector does not loosen after installation;

[0066] Step 3: Cut the pipe along its axial direction into a first protective flap 1 and a second protective flap 2 by wire cutting, so as to achieve higher coaxiality;

[0067] Step 4: drilling a side hole 101, an oblique hole 102, an oblique hole 2 105, an oblique hole 3 204, and an oblique hole 4 203 on the first protective flap 1 and the second protective flap 2 respectively;

[0068] Step 5: Cutting a wire groove 106 and a wire groove 2 107 along the axial direction of the inner side of the first protective flap 1 by wire cutting;

[0069] Step 6: Weight reduction processing: Processing a through groove 103 and a blind groove 104 on the first protective flap 1; processing a through groove 202 and a blind groove 201 on the second protective flap 2;

[0070] Step 7: Slope surfaces are machined at both ends of the first protective flap 1 and the second protective flap 2, and the slope surfaces are chamfered at C26*30°;

[0071] Step eight: Install the ball on the side hole 101, the inclined hole 102, the inclined hole 2 105, the inclined hole 3 204 and the inclined hole 4 203 from the inner side of the first protective flap 1 and the second protective flap 2 to make a protector. The ball is installed from the inner side of the protector and is not easy to get loose. The structure adopts two pins and four pull plates, which is safer and more reliable.

[0072] Embodiment five:

[0073] A manufacturing process of a downhole casing protector comprising the following steps:

[0074] Step 1: Casting a first protective flap 1 and a second protective flap 2;

[0075] Step 2: Punching: Punch two pin holes 5 from the ends of the pipe fittings, and punch several connecting holes 4 side by side from the sides of the pipe fittings;

[0076] Step 3: drilling a side hole 101, an oblique hole 102, an oblique hole 2 105, an oblique hole 3 204, and an oblique hole 4 203 on the first protective flap 1 and the second protective flap 2 respectively;

[0077] Step 4: Install the ball bearings on the side hole 101, the inclined hole 102, the inclined hole 2 105, the inclined hole 3 204 and the inclined hole 4 203 from the inner sides of the first protective flap 1 and the second protective flap 2 to manufacture the protector.

[0078] A supporting downhole casing protector and its manufacturing process, wherein a first protection flap 1 and a second protection flap 2 are rotatably connected by a pull plate 3, and a structure connecting a pin and the pull plate 3 is adopted, so that the opening of the protector is larger and the installation is more convenient; by providing slope angles at the upper and lower ends of the first protection flap 1 and the second protection flap 2, the protector has no obstruction when entering and exiting the wellhead, and by installing a ball bearing, the friction of the protector can be reduced when sliding.

[0079] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0080] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A supporting downhole casing protector, characterized in that: include: A first protective flap and a second protective flap: the first protective flap and the second protective flap are connected to form a cylindrical structure by a plurality of bolts arranged in parallel; A plurality of pull plates: the pull plates are hinged between the first protective flap and the second protective flap; A plurality of balls: the balls are rollingly mounted on the inner sides of the first protective flap and the second protective flap; Several weight-reducing grooves: Several weight-reducing grooves are distributed on the first protective flap and the second protective flap; Both ends of the cylindrical structure are provided with sloped surfaces; The weight-reducing groove comprises a blind groove 1 and a blind groove 2, wherein the blind groove 1 and the blind groove 2 are respectively inclinedly arranged on the peripheral side surfaces of the first protective flap and the second protective flap, and the inclination directions of the blind groove 1 and the blind groove 2 are opposite; The first protective flap is provided with an array of inclined holes 1 and 2 along the two sides of the blind groove 1, and the first protective flap is also provided with side holes at its corners. The second protective flap is provided with inclined holes 3 and 4 arranged in an array along the two sides of the blind groove 2 on its circumferential side, and the second protective flap is also provided with side holes located at its corners on its circumferential side; Balls are installed in the side hole, the first inclined hole, the second inclined hole, the third inclined hole and the fourth inclined hole; The sides of the first protective flap and the second protective flap are both provided with connecting holes in parallel, and the bolts pass through the connecting holes to connect the first protective flap and the second protective flap.

2. The supporting downhole casing protector according to claim 1 is characterized in that: One side of the first protective flap is provided with a plurality of connecting grooves arranged in parallel along its axial direction, and one end is provided with a pin hole penetrating through the first protective flap and connected; One side of the second protective flap is provided with a plurality of connecting grooves arranged in parallel along its axial direction, and one end is provided with a pin hole penetrating through the second protective flap and connected; The pull plate is installed in the connecting groove through pins.

3. A supporting downhole casing protector according to claim 2, characterized in that: The pull plate is a rectangular plate with rounded corners on both sides, and the length of the rectangular groove formed by splicing the connecting grooves of the first protective flap and the second protective flap is greater than the length of the pull plate.

4. The supporting downhole casing protector according to claim 3 is characterized in that: A first wire groove and a second wire groove are formed on the inner side of the first protective flap.

5. The supporting downhole casing protector according to claim 4 is characterized in that: The weight-reducing grooves further include a plurality of through grooves 1 and a plurality of through grooves 2, wherein the through grooves 1 and the through grooves 2 are respectively arranged on the peripheral side surfaces of the first protective flap and the second protective flap.

6. A manufacturing process of a supporting downhole casing protector, characterized in that: The manufacturing process is used to manufacture the protector according to claim 5; the manufacturing process includes process 1, which includes the following steps: Step 1: Take a section of thick-walled pipe and rough and fine turn it to the required outer and inner circle sizes; Step 2: Punching: Punch two pin holes at the ends of the pipe fittings, and punch several connecting holes side by side at the sides of the pipe fittings; Step 3: Cut the pipe along its axial direction into a first protective flap and a second protective flap by wire cutting; Step 4: drilling a side hole, an oblique hole 1, an oblique hole 2, an oblique hole 3, and an oblique hole 4 on the first protective flap and the second protective flap respectively; Step 5: Cutting the first and second wire grooves along the axial direction of the inner side of the first protective flap by wire cutting; Step 6: Weight reduction processing: Process through groove 1 and blind groove 1 on the first protective flap; process through groove 2 and blind groove 2 on the second protective flap; Step 7: Carve out slope surfaces at both ends of the first protective flap and the second protective flap; Step 8: Install the ball bearings on the side hole, the inclined hole 1, the inclined hole 2, the inclined hole 3 and the inclined hole 4 from the inner sides of the first protective flap and the second protective flap to make the protector.

7. A manufacturing process of a supporting downhole casing protector, characterized in that: The manufacturing process is used to manufacture the protector according to claim 5; the manufacturing process includes process 2, which includes the following steps: Step 1: Casting a first protective flap and a second protective flap; Step 2: Punching: Punch two pin holes at the ends of the pipe fittings, and punch several connecting holes side by side at the sides of the pipe fittings; Step 3: drilling a side hole, an oblique hole 1, an oblique hole 2, an oblique hole 3, and an oblique hole 4 on the first protective flap and the second protective flap respectively; Step 4: Cutting the first and second wire grooves along the axial direction of the inner side of the first protective flap by wire cutting; Step 5: Weight reduction processing: Process through groove 1 and blind groove 1 on the first protective flap; process through groove 2 and blind groove 2 on the second protective flap; Step 6: Carve out slope surfaces at both ends of the first protective flap and the second protective flap; Step 7: Install the ball bearings on the side hole, the inclined hole 1, the inclined hole 2, the inclined hole 3 and the inclined hole 4 from the inner sides of the first protective flap and the second protective flap to make the protector.

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