An impurity separation device for oil production

Abstract

The invention discloses an impurity separation device for oil production, belonging to the technical field of oil impurity separation equipment; an impurity separation device for oil production, comprising support rods uniformly distributed on a circumference and a wire winding structure wound on the support rods, the wire winding structure comprising a first wire winding and a second wire winding, the cross-sections of the first wire winding and the second wire winding are in an inverted trapezoidal structure with a larger outer portion and a smaller inner portion, the radial height of the second wire winding is greater than the radial height of the first wire winding, the first wire winding and the second wire winding are arranged in an alternating manner, and the spacing between two adjacent second wire windings is greater than the spacing between the first wire winding and the second wire winding; the invention has the advantages of extending the service life of a wire winding screen tube and facilitating the reverse flushing of the wire winding screen tube.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum equipment, and in particular to an impurity separation device for petroleum production. Background Art

[0002] In oil drilling operations, screen pipes are an important piece of equipment. The main function of oil screen pipes is to prevent sand. When used, oil screen pipes are installed at the bottom of the oil well to separate the mined oil from the sand and gravel in the formation. The oil screen pipe is equipped with a filter to separate the oil from the sand in the formation.

[0003] At present, the most commonly used screen is the wire-wound screen. The manufacturing method of this screen is: a steel wire of a certain cross section is wound around the screen rods or the metal liner with holes evenly distributed around and welded, and a certain gap is left as the screen hole. Although this manufacturing method has been widely used in China, this screen has some characteristics when it is lowered into the well, such as the wear resistance of the screen, which has a significant impact on the service life of the screen.

[0004] The prior art solves the above-mentioned problem mainly by improving materials. The present application proposes a new wire-wound screen tube with good wear resistance to solve the problem. Summary of the invention

[0005] The purpose of the present invention is to solve the problem in the prior art that the wear resistance of the wire-wound screen used in oil production needs to be improved, and to propose an impurity separation device for oil production.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An impurity separation device for petroleum production includes support rods uniformly distributed on a circumference and a wire winding structure wound on the support rods, the wire winding structure includes a first wire winding and a second wire winding, the cross-section of the first wire winding and the second wire winding is an inverted trapezoidal structure with a larger outer side and a smaller inner side, the radial height of the second wire winding is greater than the radial height of the first wire winding, the first wire winding and the second wire winding are arranged in an alternating manner, and the spacing between two adjacent second wire windings is greater than the spacing between the first wire winding and the second wire winding.

[0008] Furthermore, the wire winding structure also includes a third wire winding, the cross-section of the third wire winding is an inverted trapezoidal structure with a larger outside and a smaller inside, the radial height of the third wire winding is greater than the radial height of the second wire winding, the second wire winding and the third wire winding are arranged alternately, and the spacing between two adjacent third wire windings is greater than the spacing between the second wire winding and the third wire winding.

[0009] Furthermore, the side walls of the second wire winding and the third wire winding are concave structures.

[0010] Furthermore, a strip groove is provided inside the support rod, and the first wire wrap, the second wire wrap, and the third wire wrap are located on the outer side wall of the strip groove.

[0011] Furthermore, support blocks are arranged inside the strip-shaped groove, and the support blocks are arranged in the strip-shaped groove at intervals along the axial direction of the support rod.

[0012] Furthermore, the support blocks are distributed along the spiral track where the third wire winding is located, and the positions of the support blocks in the strip grooves correspond to the third wire winding.

[0013] Furthermore, the third wire windings are grouped as one circle extending along the spiral track, the support blocks are grouped as one circle arranged along the spiral track, and at least one group of the third wire windings is spaced between two adjacent groups of support blocks.

[0014] Furthermore, the pitch of the second wire winding and the third wire winding is twice the pitch of the first wire winding.

[0015] Furthermore, the first wire wrap, the second wire wrap, and the third wire wrap are arranged alternately along the axial spiral intervals of the support rod, a first sieve gap is formed between the first wire wrap and the second wire wrap, a second sieve gap is formed between the second wire wrap and the third wire wrap, a third sieve gap is formed between two adjacent third wire wraps, the third sieve gap is located above the second wire wrap, and the second sieve gap is located above the first wire wrap.

[0016] Furthermore, the edges of the first wire wrap, the second wire wrap, and the third wire wrap are all rounded.

[0017] Compared with the prior art, the present invention provides an impurity separation device for oil production, which has the following beneficial effects:

[0018] The present invention discloses an impurity separation device for oil production. When in use, oil enters from the gap between the second wire windings, and impurities such as sand particles whose particle size is larger than the gap between the second wire windings are screened to the outside of the second wire windings. Then, the oil with impurities continues to enter from the gap between the first wire windings and the second wire windings into the inside of the first wire windings. Impurities in the oil are further filtered, screened and separated through the gap between the first wire windings and the second wire windings, so that the impurities in the oil meet the standards. Compared with the wire winding screen in the prior art, the present application adds the second wire winding on the basis of the first wire winding, thereby reducing the screening amount of the first wire winding, reducing the contact between the first wire winding and impurities, and further reducing the wear of the first wire winding, thereby increasing the service life of the first wire winding.

[0019] Other advantages, objectives and features of the present invention will be described in part in the following description; and in part, will be apparent to those skilled in the art based on an examination of the following; or, may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 3 It is a schematic side view of the overall structure of the present invention;

[0023] Figure 4 It is a schematic cross-sectional view of the overall structure of the present invention in the main viewing direction;

[0024] Figure 5 For the present invention Figure 4 Schematic diagram of the magnified effect of the structure of part A in the middle;

[0025] Figure 6 It is a three-dimensional schematic diagram of the third wire winding structure of the present invention;

[0026] Figure 7 It is a three-dimensional schematic diagram of the distribution of support rods of the present invention;

[0027] Figure 8 It is a three-dimensional schematic diagram of the support rod structure of the present invention;

[0028] Fig. 9 For the present invention Figure 8 Schematic diagram of the structure magnification effect of part B in the middle;

[0029] Fig.10 It is a three-dimensional schematic diagram of the distribution of the support blocks of the present invention;

[0030] Fig.11 It is a front view schematic diagram of the distribution of the support blocks of the present invention;

[0031] Fig.12 It is a partial cross-sectional schematic diagram of the first spiral structure and the second spiral structure of the present invention.

[0032] In the figure:

[0033] 1. Fixed seat; 2. Wire winding structure; 201. First wire winding; 202. Second wire winding; 203. Third wire winding; 204. First sieve slit; 205. Second sieve slit; 206. Third sieve slit; 3. Support rod; 301. Strip groove; 302. Support block; 4. First spiral structure; 5. Second spiral structure. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] Example 1

[0036] Reference Figure 1-6 and Fig.12 The present invention discloses an impurity separation device for petroleum production, comprising support rods 3 uniformly distributed in a circle and a wire winding structure 2 wound on the support rods 3. The support rods 3 are round rods or square rods and are arranged along a circular trajectory to form a support frame structure for a wire winding screen tube. The axial direction of the support rods 3 is the axial direction of the wire winding screen tube of the device, and the axis of the circular trajectory where the support rods 3 are located is the axis of the spiral trajectory of the wire winding structure 2. A fixed seat 1 is installed at both axial ends of the support rods 3 and the wire winding structure 2, and the support rods 3, the wire winding structure 2 and the fixed seat 1 are welded together.

[0037] The wire winding structure 2 includes a first wire winding 201 and a second wire winding 202. The first wire winding 201 and the second wire winding 202 are both trapezoidal wire windings with a spiral structure, that is, the cross-section of the first wire winding 201 and the second wire winding 202 is an inverted trapezoidal structure with a large outside and a small inside. Here, "large outside and small inside" means that the side away from the center of the wire winding structure 2 is the outside, and the side close to the center of the wire winding structure 2 is the inside. For details, please refer to the attached Figure 5 , in the attached Figure 5 In the figure, the bottom end of the first wire wrap 201 and the second wire wrap 202 is the inner end, and the top end of the first wire wrap 201 and the second wire wrap 202 is the outer end. The axial width of the top end of the two is greater than the axial width of the bottom end, so that the cross-section of the first wire wrap 201 and the second wire wrap 202 is an inverted trapezoidal structure. The first wire wrap 201 and the second wire wrap 202 are both welded and fixed on the support rod 3.

[0038] The radial height of the second wire winding 202 is greater than the radial height of the first wire winding 201. The first wire winding 201 and the second wire winding 202 are arranged alternately. In this embodiment, the pitch of the second wire winding 202 and the first wire winding 201 can be selected to be equal. Fig.12The first spiral structure 4 is a combination structure of a first wire winding 201 and a second wire winding 202 (of course, the pitch of the second wire winding 202 and the first wire winding 201 may be different, and the spacing relationship between the first wire winding 201 and the second wire winding 202 remains unchanged), and the spacing between two adjacent second wire windings 202 is greater than the spacing between the first wire winding 201 and the second wire winding 202, so that the width of the spacing between two adjacent second wire windings 202 is greater than the width of the first sieve slit 204. During use, oil flows from the outside to the inside of the wire winding structure 2, and impurities in the oil first contact the second wire winding 202, and then the impurities with a particle size larger than the spacing between two adjacent second wire windings 202 are separated on the outside of the second wire winding 202, and the impurities with a particle size smaller than the spacing between two adjacent second wire windings 202 enter the inside of the second wire winding 202 together with the oil.

[0039] When the petroleum entering the inner side of the second winding wire 202 passes through the first sieve slit 204 , impurities with a particle size larger than the first sieve slit 204 are separated on the outer side of the first winding wire 201 , and impurities with a particle size smaller than the first sieve slit 204 enter the inner side of the first winding wire 201 .

[0040] Example 2

[0041] Reference Figure 1-12 The present invention is an impurity separation device for petroleum production. The difference between this embodiment and embodiment 1 is that the wire winding structure 2 also includes a third wire winding 203, the cross-section of the third wire winding 203 is an inverted trapezoidal structure with a large outside and a small inside, the radial height of the third wire winding 203 is greater than the radial height of the second wire winding 202, the second wire winding 202 and the third wire winding 203 are arranged alternately, and the spacing between two adjacent third wire windings 203 is greater than the spacing between the second wire winding 202 and the third wire winding 203.

[0042] In this embodiment, the pitch of the second wire winding 202 and the third wire winding 203 can be selected to be equal, and the pitch of the second wire winding 202 and the third wire winding 203 is twice that of the first wire winding 201. Figure 5 The order of arrangement shown.

[0043] In the attached Figure 5In the figure, the spiral arrangement order of the cross-sections of the first wire winding 201, the second wire winding 202, and the third wire winding 203 is: according to the order from left to right in the figure, when one of the segments of the first wire winding 201 is the first structure, the second structure is the segment of the third wire winding 203, the third structure is the segment of the first wire winding 201, and the fourth structure is the segment of the second wire winding 202, and so on as a group, they are arranged in a cycle; or when one of the segments of the first wire winding 201 is the first structure, the second structure is the segment of the second wire winding 202, the third structure is the segment of the first wire winding 201, and the fourth structure is the segment of the third wire winding 203, and so on as a group, they are arranged in a cycle.

[0044] Alternatively, one of the segments of the second winding wire 202 may be the first structure, the second structure may be the segment of the first winding wire 201 , the third structure may be the segment of the third winding wire 203 , and the fourth structure may be the segment of the first winding wire 201 .

[0045] It is also possible to take one of the segments of the third winding wire 203 as the first structure, the second structure as the segment of the first winding wire 201 , the third structure as the segment of the second winding wire 202 , and the fourth structure as the segment of the first winding wire 201 .

[0046] The third wire wrap 203 here is a structure further added to the wire wrap structure 2, which is used to increase the number of screening and filtering layers for impurities in the present device, reduce the wear of the second wire wrap 202 and the first wire wrap 201, and increase the overall service life.

[0047] Of course, more wire wraps can be added to increase the number of screening layers. Based on actual conditions, three layers of wire wraps are taken as an example here.

[0048] In this embodiment, the pitch of the second wire 202 and the third wire 203 is twice the pitch of the first wire 201. Of course, without affecting the relationship between the first sieve slit 204, the second sieve slit 205, and the third sieve slit 206, the pitch between the first wire 201, the second wire 202, and the third wire 203 can also be other proportional relationships. For the convenience of processing and description, the pitch of the second wire 202 and the third wire 203 is twice the pitch of the first wire 201 as an example. For details, please refer to Fig.12 The second spiral structure 5 is a partial schematic diagram of the second spiral structure 5, wherein the second spiral structure 5 is a combination structure of the first winding wire 201, the second winding wire 202, and the third winding wire 203.

[0049] The first wire wrap 201 , the second wire wrap 202 , and the third wire wrap 203 are arranged alternately along the axial spiral of the support rod 3 . Specifically, as described above, the first wire wrap 201 , the second wire wrap 202 , and the third wire wrap 203 of each group are arranged along the axial direction of the support rod 3 .

[0050] A first sieve gap 204 is formed between the first wire wrap 201 and the second wire wrap 202, and the first sieve gap 204 is located on both sides of the top of the first wire wrap 201. A second sieve gap 205 is formed between the second wire wrap 202 and the third wire wrap 203, and the second sieve gap 205 is located on both sides of the top of the second wire wrap 202. A third sieve gap 206 is formed between two adjacent third wire wraps 203, and the third sieve gap 206 is located on both sides of the top of the third wire wrap 203. The third sieve gap 206 is located above the second wire wrap 202, and the second sieve gap 205 is located above the first wire wrap 201.

[0051] In the present application, the screening accuracy of the device is based on the size of the first sieve slit 204. The oil and impurities entering the third sieve slit 206 are screened and then diverted into the two second sieve slits 205. After further screening, they are diverted into the four first sieve slits 204, and finally enter the inner side of the device after screening.

[0052] The side walls of the second wire wrap 202 and the third wire wrap 203 are concave structures, as shown in FIG. Figure 5 As shown, the concave structure makes the space enclosed between the top of the first wire wrap 201 and the side walls of the second wire wrap 202 and the side walls of the third wire wrap 203, and the space enclosed between the top of the second wire wrap 202 and the side walls of the third wire wrap 203 larger than the space enclosed by the planar structure. Firstly, it can accommodate more impurities and increase the filtration time in each use cycle. Secondly, it is easier to clean the impurities remaining on the side walls of the first wire wrap 201, the second wire wrap 202, and the third wire wrap 203 during reverse cleaning after the expiration of each use cycle, and cleaning is more convenient.

[0053] At the same time, affected by the concave structure, in the aforementioned diversion process, the oil first contacts the top middle position of the second wire winding 202 and the first wire winding 201, and then flows to the second screen slot 205 and the first screen slot 204 on both sides. In this way, the wear speed of the first screen slot 204 and the second screen slot 205 is further slowed down, thereby increasing the service life of the device.

[0054] The edges of the first wire wrap 201, the second wire wrap 202, and the third wire wrap 203 are all rounded. Compared with the angular structure, the rounded corners can reduce the jamming of the first screen slit 204, the second screen slit 205, and the third screen slit 206 with impurities. At the same time, during flushing, it is also convenient to flush out impurities from the inner side of the first wire wrap 201, the second wire wrap 202, and the third wire wrap 203 (the inner side of the first wire wrap 201, the second wire wrap 202, and the third wire wrap 203 refers to the space below the inner side wall of the first wire wrap 201, the second wire wrap 202, and the third wire wrap 203).

[0055] Example 3

[0056] Reference Figure 1-12 The present invention is an impurity separation device for petroleum production. The difference between this embodiment and embodiment 2 is that a strip groove 301 is processed inside the support rod 3, and the strip groove 301 is distributed on the side of the support rod 3 away from the axis of the device, that is, it is located on the side of each support rod 3 close to the connection position between the support rod 3 and the wire winding structure 2, and the two ends of the strip groove 301 along the axial direction of the support rod 3 are closed structures, and the two ends along the circumferential direction of the support rod 3 are open structures.

[0057] The first wire wrap 201, the second wire wrap 202, and the third wire wrap 203 are located on the outer side wall of the strip groove 301. Under normal circumstances, the first wire wrap 201, the second wire wrap 202, and the third wire wrap 203 maintain a stable state on the outer wall of the support rod 3, and the first sieve slit 204, the second sieve slit 205, and the third sieve slit 206 screen and filter the impurities. When the first sieve slit 204, the second sieve slit 205, and the third sieve slit 206 are filled with impurities and blocked by impurities, they need to be reversely flushed and reused. After processing the strip groove 301, when the first sieve slit 204, the second sieve slit 205, and the third sieve slit 206 are filled with impurities and blocked by impurities, the structural strength of the side wall of the strip groove 301 is weaker than the structural strength of the support rod 3 as a whole, and the upper limit of the supporting force of the side wall of the strip groove 301 on the wire wrap structure 2 is also less than the upper limit of the supporting force of the support rod 3 as a whole on the wire wrap structure 2. After the first sieve slit 204, the second sieve slit 205, and the third sieve slit 206 are blocked, the first wire winding 201, the second wire winding 202, and the third wire winding 203 are squeezed under the pressure of external oil, and the side wall of the strip groove 301 is elastically deformed toward the side of the center of the support rod 3. During the elastic deformation process, the first sieve slit 204, the second sieve slit 205, and the third sieve slit 206 are also deformed, causing the space enclosed by the first wire winding 201, the second wire winding 202, and the third wire winding 203 to also deform, squeezing out impurities located in these spaces. Then, when the device is cleaned (whether it is downhole cleaning or surface cleaning), the pressure inside and outside the device is restored to balance, the wire winding structure 2 and the side wall of the strip groove 301 are restored to their original state, and the impurities originally accumulated and attached to the side walls of the first wire winding 201, the second wire winding 202, and the third wire winding 203 become loose, and are easier to be washed away during back flushing.

[0058] Example 4

[0059] Reference Figure 1-12, the present invention is an impurity separation device for oil production. The difference between this embodiment and embodiment 3 is that a support block 302 is installed inside the strip groove 301. The support block 302 is installed in the strip groove 301 along the axial interval of the support rod 3. The function of the support block 302 is that if the support block 302 is not installed, the first wire winding 201, the second wire winding 202, and the third wire winding 203 located above the side wall of the strip groove 301 will be elastically deformed at the same time when blocked, and the degree of deformation of the space surrounded by the first wire winding 201, the second wire winding 202, and the third wire winding 203 is relatively small. After the support block 302 is installed, the wire winding structure 2 located above the support block 302 is almost not deformed, while the wire winding structure 2 without the support block 302 is elastically deformed, and an obvious relative position offset is generated between the deformed wire winding structure 2 and the non-deformed wire winding structure 2. Compared with the wire winding structure 2 located on the side wall of the strip groove 301 in embodiment 3 being deformed at the same time, the dislocation effect is more obvious.

[0060] In fact, when misalignment occurs, the deformation of impurities near the side wall of the wire winding structure 2, which is almost not deformed, is also small, while the deformation of impurities accumulated on one side of the wire winding structure 2 that undergoes elastic deformation is larger. During reverse flushing, the flushing solution (or water) easily flows from the inside to the outside of the device from the side with a larger deformation, thereby making it easier to flush out impurities from the space enclosed by the first wire winding 201, the second wire winding 202, and the third wire winding 203.

[0061] The support block 302 is distributed along the spiral track where the third wire winding 203 is located. The position of the support block 302 in the strip groove 301 corresponds to the third wire winding 203. The third wire winding 203 is installed on the outside of the support block 302. The effect is that the top area of ​​the third wire winding 203 is larger than that of the second wire winding 202 and the first wire winding 201. When subjected to the pressure of external oil, the pressure transmitted to the side wall of the strip groove 301 is also the largest, and the deformation amount is also the largest. When the third wire winding 203 is squeezed and deformed, it can drive the first wire winding 201 and the second wire winding 202 on both sides to deform at the same time (under the same circumstances, if the first wire winding 201 or the second wire winding 202 is deformed, it is relatively difficult to drive the other wire windings to undergo the same deformation). Therefore, the support block 302 only supports the third wire winding 203 to achieve a better deformation effect, and the structure is simple.

[0062] Further, the third wire winding 203 is extended in one circle along the spiral trajectory as a group, and the support block 302 is arranged in one circle along the spiral trajectory as a group. There is at least one group of third wire winding 203 between two adjacent groups of support blocks 302. Specifically, the third wire winding 203 with a spiral structure is a group according to a spiral angle of 360 degrees (i.e., one circle of the third wire winding 203). The third wire winding 203 that is spirally extended along the axis direction of the device is divided into multiple groups along the axis. A group of third wire windings 203 supported by the support block 302 and a group of third wire windings 203 not supported by the support block 302 are separated. The third wire wraps 203 supported by the support block 302 are arranged alternately, that is, a group of third wire wraps 203 supported by the support block 302 is connected to a group of third wire wraps 203 not supported by the support block 302, and then connected to a group of third wire wraps 203 supported by the support block 302, so as to form a complete third wire wrap 203 and a support block 302. In this case, as mentioned above, the group of third wire wraps 203 not supported by the support block 302 has a more obvious deformation than the third wire wraps 203 supported by the support block 302 on both sides.

[0063] It should be noted that other numbers of third wire windings 203 supported by the support block 302 and third wire windings 203 not supported by the support block may also be selected, such as two groups of third wire windings 203 not supported by the support block 302 being connected to one group of third wire windings 203 supported by the support block 302, etc.

[0064] Working principle: When in use, the oil and impurities on the outside of the device are screened and separated once through the third sieve slit 206, and then enter the inside of the third wire winding 203. After diversion, the oil and impurities are screened and separated twice through the second sieve slit 205, and then enter the inside of the second wire winding 202. After diversion, the oil and impurities are screened and separated three times through the first sieve slit 204, and then enter the inside of the device, completing the screening and separation of oil and impurities.

[0065] When the first sieve slit 204, the second sieve slit 205 and the third sieve slit 206 are blocked, the external pressure causes the wire winding structure 2 to elastically deform toward the center, squeezing the impurities located in the first sieve slit 204, the second sieve slit 205 and the third sieve slit 206. During reverse flushing, the internal and external pressures of the device are balanced, the wire winding structure 2 returns to its original state, and the flushing solution flows out from between the loose impurities on the side of the wire winding structure 2 that is not supported by the support block 302, flushing the impurities and smoothly taking them away, making it easier to reversely flush the impurities.

[0066] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0068] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An impurity separation device for petroleum production, comprising support rods (3) uniformly distributed around the circumference and a wire winding structure (2) wound around the support rods (3), characterized in that: The wire winding structure (2) comprises a first wire winding (201) and a second wire winding (202); the cross-sections of the first wire winding (201) and the second wire winding (202) are in an inverted trapezoidal structure with a larger outer portion and a smaller inner portion; the radial height of the second wire winding (202) is greater than the radial height of the first wire winding (201); the first wire winding (201) and the second wire winding (202) are arranged in a staggered manner; and the spacing between two adjacent second wire windings (202) is greater than the spacing between the first wire winding (201) and the second wire winding (202); The wire winding structure (2) further comprises a third wire winding (203), the cross section of the third wire winding (203) presenting an inverted trapezoidal structure with a larger outer portion and a smaller inner portion, the radial height of the third wire winding (203) being greater than the radial height of the second wire winding (202), the second wire winding (202) and the third wire winding (203) being arranged in a staggered manner, and the spacing between two adjacent third wire windings (203) being greater than the spacing between the second wire winding (202) and the third wire winding (203); The side walls of the second wire wrap (202) and the third wire wrap (203) are concave structures; A strip-shaped groove (301) is provided inside the support rod (3), and the first wire wrap (201), the second wire wrap (202), and the third wire wrap (203) are located on the outer side wall of the strip-shaped groove (301); A support block (302) is arranged inside the strip groove (301), and the support block (302) is arranged in the strip groove (301) at intervals along the axial direction of the support rod (3); The support blocks (302) are distributed along the spiral track where the third wire winding (203) is located, and the position of the support blocks (302) in the strip groove (301) corresponds to the third wire winding (203); The first wire wrap (201), the second wire wrap (202), and the third wire wrap (203) are arranged in an axial spiral staggered arrangement, wherein a first sieve slit (204) is formed between the first wire wrap (201) and the second wire wrap (202), a second sieve slit (205) is formed between the second wire wrap (202) and the third wire wrap (203), and a third sieve slit (206) is formed between two adjacent third wire wraps (203); the third sieve slit (206) is located above the second wire wrap (202), and the second sieve slit (205) is located above the first wire wrap (201); The third wire wrap (203) extends one circle along the spiral track as a group, the support blocks (302) are arranged one circle along the spiral track as a group, and at least one group of the third wire wrap (203) is spaced between two adjacent groups of support blocks (302).

2. The impurity separation device for oil production according to claim 1, characterized in that: The pitch of the second wire winding (202) and the third wire winding (203) is twice the pitch of the first wire winding (201).

3. The impurity separation device for oil production according to claim 2, characterized in that: The edges of the first wire wrap (201), the second wire wrap (202), and the third wire wrap (203) are all rounded.

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