CN111852399A - Weighting rod and paraffin removal tool - Google Patents

Abstract

The invention provides a weighting rod and a paraffin removal tool, and relates to the field of oil and gas exploitation. According to the weighting rod provided by the invention, one end of the weighting rod is connected with the steel wire, the other end of the weighting rod is connected with the wax scraping cylinder, the weighting rod is provided with the paraffin removal structure, and the diameter of the paraffin removal structure is larger than that of the weighting rod. The paraffin removal structure can be matched with the paraffin removal cylinder to remove the paraffin together, so that the weighting rod also has the paraffin removal function, the working efficiency of the paraffin removal tool is improved, the paraffin removal effect of the paraffin removal tool is better, the time interval between two times of paraffin removal operation can be prolonged, the manual workload of the paraffin removal operation is reduced, the labor cost of crude oil production is favorably reduced, and the influence of the paraffin removal operation on the crude oil production is reduced. The invention also provides a paraffin removal tool which comprises the weighting rod.

Description

Weighting rod and paraffin removal tool

Technical Field

The invention relates to the field of oil and gas exploitation, in particular to a weighting rod and a paraffin removal tool.

Background

In the process of crude oil extraction, as the temperature and the pressure of crude oil are continuously reduced, paraffin dissolved in the crude oil can be continuously crystallized, separated out and accumulated and is attached to the inner wall of an oil pipe, so that the inner wall of the oil pipe is waxed. Wax deposition on the inner wall of the oil pipe can reduce the flow section of the oil pipe and influence the yield of an oil well. Severe wax deposition on the inner wall of the tubing can even block the tubing. Therefore, oil well paraffin removal is an important means for ensuring smooth production of oil wells.

The existing oil well paraffin removal tool comprises a steel wire, a weighting rod and a paraffin scraping cylinder which are sequentially connected along the gravity direction. The steel wire controls the oil well paraffin removal tool to move up and down in the oil pipe, the weighting rod plays a role in weighting, the weighting rod overcomes the hydraulic pressure and the buoyancy of crude oil through self gravity, the oil well paraffin removal tool can sink successfully, and the paraffin scraping cylinder plays a role in scraping paraffin when the paraffin scraping cylinder rubs with paraffin deposited on the inner wall of the oil pipe due to high self hardness.

The weighting rod of the existing oil well paraffin removal tool has no paraffin removal effect, only the paraffin removal cylinder can remove paraffin, the working efficiency is low, the paraffin removal effect is poor, field workers have to spend a large amount of time for paraffin removal operation, the workload is high, and the labor cost of crude oil production is increased.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a weight bar and a paraffin removal tool to overcome some of the disadvantages of the prior art.

The invention provides a weighting rod, wherein one end of the weighting rod is connected with a steel wire, the other end of the weighting rod is connected with a wax scraping cylinder, a wax cleaning structure is arranged on the weighting rod, and the diameter of the wax cleaning structure is larger than that of the weighting rod.

The weighted rod as described above, optionally, the paraffin removal structure comprises a plurality of protrusions.

The weighted rod as described above, optionally, the paraffin removal structure comprises an impeller; the weighting rod is provided with a mounting hole which is a through hole, and the impeller is arranged in the mounting hole; the impeller includes a plurality of blades; an impeller shaft is further mounted in the mounting hole, penetrates through the mounting hole, protrudes out of the side wall of the mounting hole at two ends and is perpendicular to the side wall of the mounting hole; the impeller is sleeved on the impeller shaft.

The weighted bar as described above, optionally, the impeller shaft comprising an impeller shaft body and an impeller shaft sleeve; the impeller shaft main body is provided with two limiting protrusions, and the impeller shaft sleeve is clamped between the two limiting protrusions; the impeller is sleeved on the impeller shaft sleeve.

Optionally, the weight bar is provided with a fixing hole, and two ends of the impeller shaft are fixed in the fixing hole.

Optionally, a plurality of mounting holes are formed on the weighting bar; the mounting holes correspond to the impellers one by one; and the adjacent mounting holes are arranged in a staggered manner.

The weighting bar as described above, optionally, the blade is provided with a sampling slot; the opening of the sampling groove is positioned on the surface of the blade.

Optionally, the surface of the sampling groove is provided with an anti-skid line.

The weighting bar as described above, optionally, a scraper is provided on the blade; the scraper is located at one end of the blade away from the impeller shaft.

The invention also provides a paraffin removal tool which comprises the weighting rod.

According to the invention, the paraffin removal structure is arranged on the weighting rod part of the paraffin removal tool, and the paraffin removal structure can be matched with the paraffin removal cylinder to remove paraffin together, so that the weighting rod also has the paraffin removal function, the working efficiency of the paraffin removal tool is improved, the paraffin removal effect is better, the manual workload of paraffin removal operation is reduced, and the labor cost of crude oil production is favorably reduced.

Drawings

FIG. 1 is a schematic view of a wax removal tool according to an embodiment of the present invention;

FIG. 2 is a schematic view of a weight bar according to another embodiment of the present invention;

FIG. 3 is a schematic view of a weight bar according to yet another embodiment of the present invention;

FIG. 4 is a schematic view of the construction of an impeller shaft according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of a weighted rod according to one embodiment of the present invention;

FIG. 6 is a schematic view of an impeller according to an embodiment of the present invention;

FIG. 7 is a schematic structural view of an impeller according to another embodiment of the present invention;

FIG. 8 is a schematic structural view of an impeller according to yet another embodiment of the present invention;

fig. 9 is a schematic view of the structure of an impeller according to still another embodiment of the present invention.

Reference numerals:

1000: a weight bar;

1100: a protrusion;

1200: an impeller;

1210: a blade;

1211: a blade tip;

1212: a sampling groove;

1213: a scraper;

1214: anti-skid lines;

1220: an impeller shaft;

1221: an impeller shaft body;

1222: an impeller shaft sleeve;

1223: a limiting protrusion;

1300: mounting holes;

1400: a fixing hole;

1500: a screw;

2000: a steel wire;

3000: and a wax scraping cylinder.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

It should be noted that the terms "first" and "second" in the description of the present invention are used merely for convenience in describing different components, and are not to be construed as indicating or implying a sequential relationship, relative importance, or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

The present invention will be described in detail below with reference to the accompanying drawings so that those skilled in the art can more fully understand the present invention.

As shown in fig. 1, the invention provides a weighting bar 1000, one end of the weighting bar 1000 is connected with a steel wire 2000, the other end of the weighting bar 1000 is connected with a wax scraping cylinder 3000, a wax cleaning structure is arranged on the weighting bar 1000, and the diameter of the wax cleaning structure is larger than that of the weighting bar 1000.

During the paraffin removal operation, the paraffin removal tool is in a vertical state, the bottom end of the weighting rod 1000 is connected with the top end of the paraffin scraping cylinder 3000, and the top end of the weighting rod 1000 is fixed with a steel wire 2000. To fix the steel wire 2000, a through hole may be opened at the top end of the weight bar 1000 to receive the steel wire 2000.

The paraffin removal tool has the mass of dozens of kilograms, and can overcome the buoyancy of oil gas and the friction between the paraffin layer on the inner wall of the oil pipe and move downwards slowly along the oil pipe under the action of the self gravity of the paraffin removal tool. The moving speed of the paraffin removal tool is determined by the field worker and the progress of paraffin removal operation.

The paraffin removal tool moves downwards, and the paraffin removal operation is carried out on the part of the paraffin removal tool, which is abutted against the paraffin deposit on the inner wall of the oil pipe. The existing paraffin removal tool only has a paraffin removal function of a paraffin removal cylinder 3000. In the embodiment, the weight rod 1000 is provided with the paraffin removal structure, and the diameter of the paraffin removal structure is larger than that of the weight rod 1000, so that the paraffin removal structure can be abutted against paraffin deposition on the inner wall of the oil pipe, and the paraffin removal structure on the weight rod 1000 can perform paraffin removal operation in the process that the paraffin removal tool continuously moves downwards.

Set up the structure of paraffin removal on the weight rod 1000 of paraffin removal instrument, this paraffin removal structure can cooperate and scrape a wax section of thick bamboo 3000 and together scrape wax for weight rod 1000 has also had the function of paraffin removal, has improved the work efficiency of paraffin removal instrument, and the paraffin removal effect is better, has reduced the manual work volume of paraffin removal operation, is favorable to reducing crude oil production's cost of labor.

The larger the diameter of the paraffin removal structure is, the higher the paraffin removal efficiency of the paraffin removal structure is, after paraffin removal is completed, the smaller the paraffin deposition layer thickness of the inner wall of the oil pipe is, but the probability of occurrence of a blocking phenomenon is also improved. The blockage phenomenon means that the paraffin removal tool cannot move under the action of a paraffin layer on the inner wall of the oil pipe, and the paraffin removal tool cannot be separated from the blockage position. The diameter of the paraffin removal structure is therefore a result of balancing the efficiency of paraffin scraping with the probability of clogging.

If the blockage occurs, the paraffin removal tool cannot move, and at the moment, if a field worker pulls the steel wire 2000 forcibly, the steel wire 2000 is likely to break, so that the paraffin removal tool is lost to be controlled, the paraffin removal tool is likely to fall, and an oil pipe is likely to be blocked. Therefore, when designing the paraffin removal tool, consideration is given to how to minimize the occurrence of the clogging phenomenon.

The wax layer on the inner wall of the oil pipe is mostly composed of grease-like semi-solid wax, but also comprises a small amount of solid wax blocks. During the paraffin removal operation, the paraffin removal tool can well remove greasy semi-solid wax. If the volume of the solid wax precipitation block is small, the solid wax precipitation block can fall off together with the greasy semisolid wax and fall back to the oil well; when the solid wax deposition block is large in volume and the wax scraping cylinder 3000 and/or the wax removing structure contacted with the solid wax deposition block are abutted against the solid wax deposition block, the wax deposition block can be loosened due to the downward movement tendency of the wax removing tool caused by gravity, so that the wax removal is facilitated, but the blockage phenomenon is possibly caused.

This technical scheme is owing to adopted and is provided with the structure of paraffin removal on the weight rod 1000, the diameter of paraffin removal structure is greater than the technological means of the diameter of weight rod 1000, so the structure of paraffin removal can cooperate and scrape 3000 wax together, make weight rod 1000 also have the function of paraffin removal, the work efficiency of paraffin removal instrument has been improved, the paraffin removal effect of paraffin removal instrument is better, can prolong the time interval between two paraffin removal operations, thereby reduce the workload of paraffin removal operation, be favorable to reducing crude oil production's cost of labor, reduce the influence of paraffin removal operation to crude oil production.

As shown in fig. 2 and 3, optionally, the paraffin removal structure of the present embodiment includes a plurality of protrusions 1100. Protrusion 1100 protrudes from the side wall of weighted rod 1000. During paraffin removal operation, the protrusion 1100 is abutted against a paraffin deposit layer on the inner wall of the oil pipe, and due to the fact that the protrusion 1100 tends to move downwards under the action of the gravity of the paraffin removal tool, paraffin removal can be achieved through the protrusion 1100 in the downward movement process, and paraffin removal performance of the weighting rod 1000 is achieved.

In order to make the residual wax layer on the inner wall of the oil pipe uniform in thickness in the circumferential direction of the inner wall of the oil pipe to prevent the wax removal tool for performing the wax removal operation from being blocked during the lifting process, a plurality of protrusions 1100 may be alternately arranged on the outer wall of the weight bar 1000.

As shown in fig. 2, a plurality of protrusions 1100 are uniformly distributed along the circumferential direction on the cross section of the weight bar 1000 perpendicular to the center line of the weight bar 1000; as shown in fig. 3, there is only one protrusion 1100 on the cross section of the weight rod 1000 perpendicular to the centerline of the weight rod 1000, and this design can reduce the friction between the weight rod 1000 and the wax layer on the inner wall of the oil pipe, thereby effectively reducing the risk of blocking.

When the paraffin removal structure is the protrusion 1100, the diameter of the paraffin removal structure is twice the radius of the paraffin removal structure, which means the shortest distance between the top surface of the protrusion 1100 away from the outer wall of the weight bar 1000 and the central axis of the weight bar 1000.

According to the technical scheme, the technical means that the paraffin removal structure comprises the plurality of protrusions 1100 is adopted, so that the protrusions 1100 on the outer wall of the weighting rod 1000 can be matched with the paraffin removal cylinder 3000 to remove paraffin together, the paraffin removal function of the weighting rod 1000 is realized, and the working efficiency of the paraffin removal tool is improved.

As shown in fig. 4 to 6, optionally, the paraffin removal structure of the present embodiment includes an impeller 1200; the weighting rod 1000 is provided with a mounting hole 1300, the mounting hole 1300 is a through hole, and an impeller 1200 is arranged in the mounting hole 1300; as shown in fig. 6, impeller 1200 includes a plurality of blades 1210; an impeller shaft 1220 is further installed in the installation hole 1300, the impeller shaft 1220 penetrates through the installation hole 1300, two ends of the impeller shaft 1220 protrude out of the side wall of the installation hole 1300, and the impeller shaft 1220 is perpendicular to the side wall of the installation hole 1300; the impeller 1200 is fitted over the impeller shaft 1220.

The mounting hole 1300 has a rectangular cross section in a plane perpendicular to the axis of the mounting hole 1300, and the axis of the mounting hole 1300 is perpendicular to the extending direction of the weight bar 1000. The mounting hole 1300 penetrates through a sidewall of the weight bar 1000, and an axis of the mounting hole 1300 perpendicularly intersects an axis of the weight bar 1000.

An impeller shaft 1220 is provided at the center of the impeller 1200, and the impeller shaft 1220 perpendicularly intersects both the axis of the weight bar 1000 and the axis of the mounting hole 1300. The impeller 1200 is installed inside the installation hole 1300, and the blade tip 1211 protrudes from the outer sidewall of the weight bar 1000. The blade tip 1211 refers to a portion of the blade 1210 away from the impeller shaft 1220 and may protrude from the outer sidewall of the weight bar 1000.

When the paraffin removal tool performs a paraffin removal operation, the blades 1210 of the impeller 1200 are subjected to a vertical upward impact force from downhole hydrocarbons, and the blades 1210 rotate about the impeller shaft 1220 under the influence of the hydrocarbon impact force. The blade tips 1211 interfere with the wax layer on the inner wall of the oil pipe, the blades 1210 have a tendency to rotate around the impeller shaft 1220, and the blade tips 1211 can be cleaned of wax during the rotation of the blades 1210.

The impeller 1200 may rotate clockwise or counterclockwise. The direction in which the impeller 1200 rotates depends on the vector sum of the clockwise steering moment and the counterclockwise steering moment. When the impeller 1200 rotates clockwise to remove the wax, if the impeller is hindered by the wax deposition and cannot rotate clockwise, the impeller 1200 may rotate counterclockwise under the action of a large counterclockwise torque, so as to be separated from the blocking position; similarly, when the impeller 1200 is rotated counterclockwise to remove wax, if the impeller is hindered from further rotation counterclockwise by the wax deposit, the impeller 1200 may rotate clockwise under the action of a large clockwise torque, thereby moving out of the blocking position; rotatable impeller 1200 may substantially reduce the risk of clogging compared to protrusion 1100.

When the paraffin removal structure is the impeller 1200, the diameter of the paraffin removal structure is twice the radius of the paraffin removal structure, and the radius of the paraffin removal structure refers to the shortest distance between the top end of the impeller 1200, which is far away from the outer wall of the weight rod 1000, and the central axis of the weight rod 1000.

In the technical scheme, the paraffin removal structure is adopted and comprises an impeller 1200; the weighting rod 1000 is provided with a mounting hole 1300, the mounting hole 1300 is a through hole, and an impeller 1200 is arranged in the mounting hole 1300; impeller 1200 includes a plurality of blades 1210; an impeller shaft 1220 is further installed in the installation hole 1300, the impeller shaft 1220 penetrates through the installation hole 1300, two ends of the impeller shaft 1220 protrude out of the side wall of the installation hole 1300, and the impeller shaft 1220 is perpendicular to the side wall of the installation hole 1300; the impeller 1200 is sleeved on the impeller shaft 1220, so that the impeller 1200 on the weighting rod 1000 can be matched with the wax scraping cylinder 3000 to scrape wax together, the function of wax removal of the weighting rod 1000 is realized, and the working efficiency of the wax removal tool is improved.

As shown in fig. 4, optionally, the impeller shaft 1220 of the present embodiment includes an impeller shaft body 1221 and an impeller shaft sleeve 1222; the impeller shaft body 1221 is provided with two limit protrusions 1223, and the impeller shaft sleeve 1222 is sandwiched between the two limit protrusions 1223; the impeller 1200 fits over the impeller shaft sleeve 1222.

The impeller shaft sleeve 1222 is sleeved in the middle of the impeller shaft 1220, and the impeller shaft sleeve 1222 can rotate relative to the impeller shaft 1220. A through hole is formed in the center of the impeller 1200, the inner wall of the through hole is fixedly connected with the outer surface of the impeller 1200 sleeve, and the impeller 1200 is sleeved on the impeller shaft sleeve 1222.

The stopper 1223 functions to restrict the impeller 1200 from sliding on the impeller shaft 1220. The outer surface of the impeller shaft 1220 may have an external thread, the stopper 1223 may have an internal thread, and the external thread of the impeller shaft 1220 may be threadedly engaged with the internal thread of the stopper 1223 to detachably couple the impeller shaft 1220 and the stopper 1223.

The limiting protrusion 1223 can be a snap ring with an opening on a side wall, one end face of the snap ring is attached to the inner wall of the mounting hole 1300, the other end face of the snap ring is attached to the impeller 1200, and the opening in the snap ring is used for the impeller shaft 1220 to come in and go out, so that the impeller shaft 1220 and the limiting protrusion 1223 can be detachably connected while the limiting protrusion 1223 plays a limiting role.

After the limiting protrusion 1223 is removed from the impeller shaft 1220, the impeller shaft sleeve 1222 together with the impeller 1200 may be removed from the impeller shaft 1220 to replace a new impeller 1200, which is beneficial to maintenance of the impeller 1200 and also beneficial to replacement of impellers 1200 with different sizes or structures, thereby changing the diameter of the paraffin removal structure and its accessory functions, for example, replacing the impeller 1200 with a paraffin-sampling function with a normal impeller 1200, or replacing the impeller 1200 with a larger diameter with a smaller diameter impeller 1200.

In the technical scheme, the impeller shaft 1220 comprises an impeller shaft main body 1221 and an impeller shaft sleeve 1222; the impeller shaft body 1221 is provided with two limit protrusions 1223, and the impeller shaft sleeve 1222 is sandwiched between the two limit protrusions 1223; the technical means that the impeller 1200 is sleeved on the impeller shaft sleeve 1222 is beneficial to preventing the impeller 1200 from sliding on the impeller shaft 1220 and is also beneficial to maintenance and replacement of the impeller 1200.

As shown in fig. 1 and 5, a fixing hole 1400 is optionally formed on the weight bar 1000 of the present embodiment, and both ends of the impeller shaft 1220 are fixed in the fixing hole 1400.

The fixing hole 1400 is formed in the side wall of the mounting hole 1300, and the inner wall of the fixing hole 1400 is fixedly connected with the outer walls of the two ends of the impeller shaft main body 1221, so that the purpose of fixing the impeller 1200 on the weighting rod 1000 of the paraffin removal tool is achieved. Each mounting hole 1300 is equipped with two coaxial fixing holes 1400.

As shown in fig. 5, the outer end of the fixing hole 1400 near the outer wall of the weight bar 1000 may be provided with an internal thread for respectively matching with the external threads of the two screws 1500. The two screws 1500 are respectively fixed at two ends of the impeller shaft 1220, and the two ends of the impeller shaft 1220 are abutted against the screws 1500, so that the impeller shaft 1220 is prevented from sliding along the extending direction of the axis of the fixing hole 1400, and the paraffin removal efficiency is improved.

Specifically, when the impeller shaft 1220 needs to be replaced, the impeller shaft 1220 can be detached only by detaching the two screws 1500, so that the impeller shaft 1220 and the weighting rod 1000 can be detachably connected, maintenance and replacement of the impeller shaft 1220 are facilitated, and paraffin removal efficiency is improved.

According to the technical scheme, the technical means that the fixed hole 1400 is formed in the weighting rod 1000 and the two ends of the impeller shaft 1220 are fixed in the fixed holes 1400 is adopted, so that the impeller 1200 is fixed on the weighting rod 1000 of the paraffin removal tool, the sliding of the impeller 1200 is avoided, and the paraffin removal efficiency is improved.

As shown in fig. 1, optionally, a plurality of mounting holes 1300 are provided on the weighting bar 1000 of the present embodiment; the mounting holes 1300 correspond to the impellers 1200 one to one; adjacent mounting holes 1300 are staggered.

Each mounting hole 1300 is provided with an impeller 1200, and the opening direction of the mounting hole 1300 determines the circumferential position of the impeller 1200 on the weight bar 1000 and also determines the circumferential position of the impeller top 1211 protruding out of the side wall of the weight bar 1000 on the weight bar 1000, namely the circumferential position of wax removed by the impeller 1200 on the inner wall of the oil pipe.

The adjacent mounting holes 1300 are arranged in a staggered mode, so that the adjacent impellers 1200 can be arranged in a staggered mode, the thickness of a residual paraffin precipitation layer on the inner wall of the oil pipe in the circumferential direction of the inner wall of the oil pipe is consistent, and blockage of a paraffin removal tool for completing paraffin removal operation in the lifting process is avoided.

At least two mounting holes 1300 are formed in the weighting bar 1000, and when only two mounting holes 1300 are formed in the weighting bar 1000, the included angle between the axes of the two mounting holes 1300 is 90 degrees; when the weight bar 1000 has three mounting holes 1300, an included angle between an axis of any one mounting hole 1300 and axes of the other two mounting holes 1300 may be 60 degrees; after paraffin removal is facilitated, the residual paraffin precipitation layer on the inner wall of the oil pipe is consistent in thickness in the circumferential direction of the inner wall of the oil pipe.

In the technical scheme, a plurality of mounting holes 1300 are formed in the weighting rod 1000; the mounting holes 1300 correspond to the impellers 1200 one to one; the technical means that the adjacent mounting holes 1300 are arranged in a staggered mode is beneficial to the consistent thickness of the residual wax deposition layer on the inner wall of the oil pipe in the circumferential direction of the inner wall of the oil pipe, and therefore blockage of the wax removal tool for completing wax removal operation in the lifting process is avoided.

As shown in fig. 7 and 8, optionally, the blade 1210 of the present embodiment is provided with a sampling groove 1212; the opening of the sampling slot 1212 is located on the surface of the blade 1210. Fig. 7 is a structural view of impeller 1200, and fig. 8 is a structural view of impeller 1200 having sampling groove 1212 in blade 1210.

The paraffin removal tool basically has the task of taking a paraffin sample in each paraffin removal operation. Because the wax appearance in the sample groove 1212 is difficult to with external oil pipe wall direct contact to the wax appearance in the sample groove 1212 is difficult for droing from paraffin removal instrument, so set up sample groove 1212 on blade 1210, is favorable to improving the probability that paraffin removal instrument got oil well oil pipe wall wax appearance.

Specifically, when the paraffin removal tool descends along the oil pipe, under the impact of oil gas, the impeller 1200 rotates, the top of the impeller 1200 collides with a paraffin deposit layer on the inner wall of the oil pipe, paraffin deposits are separated from the inner wall of the oil pipe under the friction of the impeller 1200, and a small amount of paraffin sample enters the sampling groove 1212.

After paraffin removal is finished, field workers can take out a wax sample from the blade 1210 sampling groove 1212 to perform a wax sample test, and a foundation is laid for the use of a later-stage paraffin inhibitor.

In the technical scheme, the blade 1210 is provided with the sampling groove 1212; the technical means that the opening of the sampling groove 1212 is positioned on the surface of the blade 1210 is favorable for improving the probability that the wax removing tool takes the wax sample on the wall of the oil well oil pipe, thereby laying a foundation for the later use of the wax inhibitor.

As shown in fig. 8, optionally, the surface of the sampling groove 1212 of the present embodiment is provided with an anti-slip pattern 1214.

The anti-slip pattern 1214 can further increase the static friction between the wax sample and the sampling groove 1212. After the wax sample gets into the sample groove 1212, the wax sample is with anti-skidding line 1214 direct contact of sample groove 1212 to reduce the probability that the wax sample breaks away from the sample groove 1212 under the effect of gravity or centrifugal force, further increased the probability that the paraffin removal instrument got the oil well oil pipe wall wax sample, thus laid a foundation for later stage wax inhibitor's use.

According to the technical scheme, the anti-skid grains 1214 are formed in the surface of the sampling groove 1212, so that the probability that wax samples are taken from the oil well oil pipe wall by a wax removal tool is further increased, and a foundation is laid for the later-stage wax inhibitor.

As shown in fig. 9, the blade 1210 of this embodiment is optionally provided with a scraper 1213; a scraper 1213 is located at the end of the blade 1210 remote from the impeller shaft 1220.

The scraper 1213 can further promote the wax hanging ability at impeller 1200 top, and under the direct action of scraper 1213, the wax deposition on the oil pipe inner wall drops more easily, is favorable to promoting the wax scraping efficiency of paraffin removal instrument. It is preferred that the hardness of the blades 1213 not exceed the hardness of the tubing wall so as to avoid scratching the tubing by the blades 1213. Therefore, the material of the blade 1213 is preferably plastic.

In addition, considering that the minimum distance between the vane top 1211 of the impeller 1200 and the inner wall of the oil pipe is only 3 to 4 mm, the scraper 1213 is preferably arranged perpendicular to the surface of the vane 1210, so that the resistance of the scraper 1213 from the wax layer can be reduced while saving space.

In the technical scheme, the blades 1210 are provided with the scrapers 1213; the technical means that the scraper 1213 is positioned at one end of the blade 1210 far away from the impeller shaft 1220 is that under the direct action of the scraper 1213, the wax deposited on the inner wall of the oil pipe is easy to fall off, which is beneficial to improving the wax scraping efficiency of the wax removal tool.

As shown in fig. 1, the present invention further provides a paraffin removal tool, which includes the weight bar 1000.

The paraffin removal tool of the technical scheme adopts the weighting rod 1000, the paraffin removal structure is arranged on the weighting rod 1000, and the diameter of the paraffin removal structure is larger than that of the weighting rod 1000. Therefore, the paraffin removal structure can be matched with the paraffin removal cylinder 3000 of the paraffin removal tool to remove paraffin together, so that the weighting rod 1000 also has the paraffin removal function, the working efficiency of the paraffin removal tool is improved, the paraffin removal effect of the paraffin removal tool is better, the time interval between two times of paraffin removal operation can be prolonged, the manual workload of the paraffin removal operation is reduced, the labor cost of crude oil production is favorably reduced, and the influence of the paraffin removal operation on the crude oil production is reduced.

Example one

The wax content of crude oil in an oil well is up to 15%, and after a period of use, the inner surface of an oil pipe for conveying the crude oil is seriously waxed and needs wax removal operation. And the site worker puts the paraffin removal tool into the oil pipe. The inside diameter of the tubing is about 89 mm and the maximum outside diameter of the paraffin removal tool is between 80 mm and 83 mm. The outer surface of the paraffin removal tool is contacted with the paraffin precipitation layer on the inner surface of the oil pipe to scrape paraffin.

The paraffin removal tool includes a wire 2000, a weighted rod 1000, and a paraffin cartridge 3000. During paraffin removal operation, in the vertical direction, the paraffin removal tool is sequentially connected with a steel wire 2000, a weighting rod 1000 and a paraffin scraping cylinder 3000 from the top end to the bottom end. The wax scraping cylinder 3000 is located at the bottommost end of the wax removal tool, the steel wire 2000 extends to the opening of the oil pipe from the tail end of the wax removal tool, the bottom of the weighting rod 1000 is fixedly connected with the top end of the wax scraping cylinder 3000, and the top of the weighting rod 1000 is connected with the steel wire 2000.

In the wax scraping process, a wax removal tool weighing tens of kilograms slowly moves downwards under the action of self gravity. In the vertical direction, the wax scraping cylinder 3000 at the bottom of the wax removal tool is in contact with the wax deposition layer on the inner wall of the oil pipe to realize wax scraping. The wax removal tool moves down while scraping wax, and the wax scraping cylinder 3000 clears the passage for the weighting rod 1000.

In this embodiment, the weighting bar 1000 is provided with a paraffin removal structure. When the paraffin removal structure is the bulge 1100, the bulge 1100 is abutted against the inner wall of the oil pipe, and paraffin removal operation is performed; similarly, when the paraffin removal structure is the impeller 1200, the blade tip 1211 of the impeller 1200 contacts the inner wall of the oil pipe, and paraffin removal is performed.

In the embodiment, in order to ensure that the residual paraffin precipitation layer on the inner wall of the oil pipe has the same thickness on the circumferential direction of the inner wall of the oil pipe after paraffin removal, when the paraffin removal structure is a plurality of bulges 1100, the bulges 1100 are arranged in a staggered manner; similarly, when the paraffin removal structure is the impellers 1200, the mounting holes 1300 corresponding to the impellers 1200 one to one are staggered, and the impellers 1200 are staggered; thereby being beneficial to avoiding the blockage of the paraffin removal tool for finishing the paraffin removal operation in the lifting process.

In this embodiment, the blade 1210 may be provided with a sampling groove 1212, and optionally, the sampling groove 1212 may be provided with anti-slip patterns 1214, so as to facilitate increasing the probability that the paraffin removal tool picks up the paraffin sample on the pipe wall of the oil pipe, and lay a foundation for the use of the later-stage paraffin inhibitor.

In this embodiment, a scraper 1213 may be installed at one end of the impeller shaft 1220 of the blade 1210, and the scraper 1213 may further improve the wax hanging capability of the top of the impeller 1200, so that the wax deposited on the inner wall of the oil pipe may be more easily removed under the direct action of the scraper 1213, which is beneficial to improving the wax scraping efficiency of the wax remover.

After paraffin removal is complete, the field crew may slowly lift the paraffin removal tool up through the wire 2000 until the paraffin removal tool is removed from the tubing. If the blade 1210 of the impeller 1200 is provided with the sampling groove 1212, the probability of taking the wax sample can be greatly improved. The obtained wax sample can be used for wax sample experiments, and provides a basis for the subsequent use of the wax inhibitor.

The wax content of the crude oil in the oil well is up to 15 percent, the inner surface of an oil pipe for conveying the crude oil is frequently waxed, and the original paraffin removal tool only has the paraffin scraping cylinder 3000 to remove the paraffin, so the paraffin removal is needed once every seven days, while the paraffin removal tool in the embodiment is adopted, and the paraffin removal structure is also arranged on the weighting rod 1000, so the paraffin removal can be carried out once every twelve days, the paraffin removal period is effectively prolonged, the total time of monthly paraffin removal operation is shortened, the influence of the paraffin removal operation on the crude oil production is reduced, and the total yield of the crude oil is favorably improved; meanwhile, the manual workload of paraffin removal operation is reduced, and the labor cost of crude oil production is favorably reduced.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The utility model provides a weighting rod, the one end of weighting rod is connected with the steel wire, the other end of weighting rod is connected with scrapes a wax section of thick bamboo, its characterized in that, be provided with paraffin removal structure on the weighting rod, paraffin removal structure's diameter is greater than weighting rod's diameter.

2. The weighted rod of claim 1, wherein the paraffin removal structure comprises a plurality of protrusions.

3. The weighted rod of claim 1, wherein the paraffin removal structure comprises an impeller; the weighting rod is provided with a mounting hole which is a through hole, and the impeller is arranged in the mounting hole; the impeller includes a plurality of blades; an impeller shaft is further mounted in the mounting hole, penetrates through the mounting hole, protrudes out of the side wall of the mounting hole at two ends and is perpendicular to the side wall of the mounting hole; the impeller is sleeved on the impeller shaft.

4. The weighted rod of claim 3, wherein the impeller shaft comprises an impeller shaft body and an impeller shaft sleeve; the impeller shaft main body is provided with two limiting protrusions, and the impeller shaft sleeve is clamped between the two limiting protrusions; the impeller is sleeved on the impeller shaft sleeve.

5. The weight bar as claimed in claim 3, wherein the weight bar is formed with a fixing hole, and both ends of the impeller shaft are fixed in the fixing hole.

6. The weight bar of claim 3, wherein a plurality of mounting holes are provided on the weight bar; the mounting holes correspond to the impellers one by one; and the adjacent mounting holes are arranged in a staggered manner.

7. The weight bar as claimed in claim 3, wherein the blade is provided with a sampling groove; the opening of the sampling groove is positioned on the surface of the blade.

8. The weight bar as claimed in claim 7, wherein the surface of the sampling groove is provided with anti-slip lines.

9. The weighted bar of claim 3, wherein the blades have a scraper disposed thereon; the scraper is located at one end of the blade away from the impeller shaft.

10. A paraffin removal tool comprising a weighted rod as claimed in any one of claims 1 to 9.

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