CN113323630B - Reducing casing scraper - Google Patents
Reducing casing scraper Download PDFInfo
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- CN113323630B CN113323630B CN202010126785.2A CN202010126785A CN113323630B CN 113323630 B CN113323630 B CN 113323630B CN 202010126785 A CN202010126785 A CN 202010126785A CN 113323630 B CN113323630 B CN 113323630B
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- 238000012546 transfer Methods 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 229910000639 Spring steel Inorganic materials 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 238000007790 scraping Methods 0.000 abstract description 43
- 238000004904 shortening Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000013461 design Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/02—Scrapers specially adapted therefor
- E21B37/04—Scrapers specially adapted therefor operated by fluid pressure, e.g. free-piston scrapers
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a variable-diameter casing scraper, wherein an upper joint and a lower joint are arranged at two ends of a mandrel, and a pressure transmission hole is formed in the mandrel. The end part of the mandrel close to the upper joint is sleeved with a guide cylinder, the plate spring is sleeved on the guide cylinder, and the scraper is sleeved at the middle position of the plate spring. One end of the plate spring is connected with the upper joint, and the other end of the plate spring is connected with the push cylinder. The push cylinder is connected with the piston, the piston is pre-fixed with the mandrel, the hydraulic cylinder sleeve is sleeved on the piston, and the piston is located close to the pressure transfer hole. The guide cylinder has a certain radian so as to guide the plate spring and the scraper to radially expand, and the plate spring is an arch structure with a certain radian so as to drive the scraper to radially expand. The variable-diameter casing scraper provided by the invention can finish scraping of a combined casing of a technical casing and a tail pipe by adopting one scraping pipe column, and can achieve the purposes of shortening the scraping operation period, reducing the operation cost and improving the operation efficiency on the premise of ensuring the safety of the scraping operation.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas well completion and underground operation casing scraping operation, in particular to a variable-diameter casing scraper.
Background
In the process of drilling, completing and production operation of an oil-gas well, removing perforating burrs, chemical plugging residues, salt scale and other foreign matters existing in the inner wall of a casing is an important process in well repair operation, and has important functions for successfully setting a packer and other downhole tools. For a borehole structure with a 127mm tail pipe combined casing hung below a 177.8mm technical casing, the technical casing and the tail pipe need to be scraped simultaneously in the following situations: the technical casing and the tail pipe are perforated to remove burrs, chemical plugging is carried out to remove adhered chemical plugging residual agents, and the production process is carried out to remove dead oil, dead wax, salt scale and the like. For combined casing, the common practice at present during scraping operation is to adopt two times of pipe columns, wherein the first time of pipe column adopts a technical casing pipe with a GX/T-178 type scraper to scrape 177.8mm above the technical casing pipe, and the second time of pipe column adopts a tail pipe with a GX/T-127 type scraper to scrape 127mm below the technical casing pipe, so that the practice increases the operation time and the cost. The diameter-variable range of the commonly used sleeve scraper with the diameter-variable function is limited at present, and the combined scraping of the inner diameter of the sleeve with the single-side diameter-expansion reaching more than 30mm cannot be met.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a variable-diameter casing scraper which can scrape a combined casing of a technical casing and a tail pipe by adopting a tubular column in one scraping process.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a variable-diameter casing scraper comprises a mandrel, an upper joint, a plate spring, a scraper, a guide cylinder, a push cylinder, a piston, a hydraulic cylinder sleeve and a lower joint. Wherein, top connection and lower clutch are arranged at the both ends of mandrel, are equipped with the pressure transmission hole on the mandrel. The end part of the mandrel close to the upper joint is sleeved with a guide cylinder, the plate spring is sleeved on the guide cylinder, and the scraper is sleeved at the middle position of the plate spring. One end of the plate spring is connected with the upper joint, and the other end of the plate spring is connected with the push cylinder. The push cylinder is connected with the piston, the piston is pre-fixed with the mandrel, the hydraulic cylinder sleeve is sleeved on the piston, and the piston is located close to the pressure transfer hole. The guide cylinder has a certain radian so as to guide the plate spring and the scraper to radially expand, and the plate spring is an arch structure with a certain radian so as to drive the scraper to radially expand.
According to the variable-diameter sleeve scraper disclosed by the invention, the piston can move along the axial direction of the hydraulic cylinder sleeve through the hydraulic control system, so that the push cylinder drives the plate spring to move, and the radial expansion and contraction of the plate spring and the scraper can be effectively realized under the guide action of the guide cylinder and the plate spring. Because the periphery of leaf spring and scraper does not have other spare parts to restrict its radial expansion, consequently, the width, thickness and the length of leaf spring are according to simply supported beam principle optimal design, can satisfy the leaf spring when opening the biggest bending stress and be less than material yield strength to can satisfy the needs of reducing size and scraping dynamics, thereby can cooperate current spring sleeve pipe scraper to adopt one time to scrape the scraping tubular column and accomplish the scraping of the compound sheathed tube of technical casing and tail pipe. In addition, the piston is pre-fixed on the mandrel, so that downhole accidents caused by the fact that the scraper extends out accidentally due to the fact that hydraulic pressure or lifting and pressing tonnage exceeds the starting pressure of the plate spring in the process of scraping the pipe column downwards and other operations can be prevented. Therefore, according to the reducing casing scraper provided by the invention, the purposes of shortening the scraping operation period, reducing the operation cost and improving the operation efficiency can be achieved on the premise of ensuring the safety of the scraping operation.
With respect to the above technical solution, further improvements as described below can be made.
The reducing casing scraper further comprises a limiting cylinder, wherein the limiting cylinder is arranged at one end, far away from the piston, in the push cylinder, and is connected with the mandrel.
The determined stroke is designed between the limiting cylinder and the piston, and the infinite diameter expansion of the plate spring can be limited while the requirement of the maximum stroke after the plate spring is started is met.
Further, in a preferred embodiment, the limiting barrel body and the inner wall of the push barrel are provided with one-way ratchet mechanisms which are matched with each other.
Under the common cooperation of a limiting cylinder and a one-way ratchet, the effect of one-way limiting and stopping can be achieved, and the scraping force of the plate spring can be kept while the radial expansion of the plate spring is ensured to be in place.
Specifically, in a preferred embodiment, the leaf spring, the scraper, the guide cylinder, the push cylinder and the piston are symmetrically arranged on both sides of the pressure transfer hole. The two ends of the plate spring close to the lower joint are respectively connected with the push cylinder and the lower joint, and the scrapers which are symmetrically arranged are arranged in a staggered mode.
Through the scrapers of two sets of crisscross settings, can ensure to realize after two sets of scrapers reducing that 360 degrees do not have the dead angle and scrape, do not keep the clearance to further improve the efficiency of scraping and the quality of scraping of scraper.
Specifically, in a preferred embodiment, the plate spring includes plate spring pieces arranged uniformly in a circumferential direction, and both ends of the plate spring piece have a thickness greater than a middle thickness.
The structure is convenient for installing fasteners at two ends of the plate spring, the plate spring is integrally designed to be in an arch shape with a certain radian, the thickness of the two ends is small, and the phenomenon that the scraper is driven by the plate spring to radially expand towards the inner wall of the sleeve pipe when stress is concentrated can be avoided.
In particular, in a preferred embodiment, the scraper comprises scraper blades which are arranged uniformly in the circumferential direction and on which scraper arcs are provided at intervals.
By designing the scraper arc, the cutting force of the scraper blade can be increased to increase the scraping efficiency of the scraper.
In particular, in a preferred embodiment, the piston is pre-fixed on the mandrel by means of shear pins.
The shearing pin structure not only can ensure the simple and compact structure of the scraper, but also can facilitate the piston to shear the pin to realize the diameter-changing function of the scraper while facilitating the pre-fixation of the piston.
Further, in a preferred embodiment, sealing rings are arranged between the upper joint and the lower joint and the mandrel, and between the piston and the hydraulic cylinder sleeve and the mandrel.
The sealing ring can further avoid leakage in the working process of the scraper to influence the working efficiency and even cause safety accidents.
Specifically, in a preferred embodiment, the leaf spring and the upper joint, the lower joint and the push cylinder are fixedly connected through bolts.
The mode of adopting the bolt fastening is simple and convenient, and is convenient for installation and maintenance, stable and reliable.
In particular, in a preferred embodiment, the leaf spring is made of spring steel material.
The material can ensure that the plate spring has higher tensile strength and higher yield strength, and has higher safety performance under the environment of repeated dynamic load scraping.
Compared with the prior art, the invention has the advantages that: the scraping of the combined sleeve of the technical sleeve and the tail pipe can be finished by adopting one scraping pipe column, and the aims of shortening the scraping operation period, reducing the operation cost and improving the operation efficiency can be achieved on the premise of ensuring the safety of the scraping operation.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
fig. 1 schematically shows the overall structure of a casing scraper of an embodiment of the present invention;
FIG. 2 schematically shows a partially enlarged structure in the direction A of FIG. 1;
FIG. 3 schematically shows a B-direction partial enlarged structure of FIG. 1;
FIG. 4 schematically illustrates a C-direction partial enlarged structure of FIG. 1;
FIG. 5 schematically illustrates a close-up structure of the D-direction of FIG. 1;
FIG. 6 schematically illustrates an enlarged view of the E-direction portion of FIG. 1;
FIG. 7 schematically illustrates a mating structure of a leaf spring and a scraper blade of an embodiment of the present invention;
fig. 8 schematically illustrates the overall construction of a doctor blade according to an embodiment of the invention;
FIG. 9 is a schematic diagram illustrating a fitting structure of a limiting cylinder and a pushing cylinder according to an embodiment of the present invention;
fig. 10 schematically shows a circumferential cross-sectional developed structure of a leaf spring fixing end of the embodiment of the present invention.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further explained in detail with reference to the figures and the embodiments without thereby limiting the scope of protection of the invention.
Fig. 1 schematically shows the overall structure of a casing scraper 10 according to an embodiment of the present invention. Fig. 2 schematically shows a partially enlarged structure in the direction a of fig. 1. Fig. 3 schematically shows a B-direction partial enlarged structure of fig. 1. Fig. 4 schematically shows a C-direction partially enlarged structure of fig. 1. Fig. 5 schematically shows a structure enlarged in a part D of fig. 1. Fig. 6 schematically shows an enlarged structure of a portion of the direction E of fig. 1. Fig. 7 schematically shows the fitting structure of the plate spring 3 and the scraper 4 of the embodiment of the present invention. Fig. 8 schematically shows the overall structure of the doctor blade 41 according to an embodiment of the invention. Fig. 9 schematically shows the matching structure of the limiting cylinder 101 and the pushing cylinder 6 according to the embodiment of the invention. Fig. 10 schematically shows a circumferential cross-sectional developed structure of the fixed end of the plate spring 3 of the embodiment of the present invention.
As shown in fig. 1 to 6, a reducing sleeve scraper 10 according to an embodiment of the present invention includes a mandrel 1, an upper joint 2, a plate spring 3, a scraper 4, a guide cylinder 5, a push cylinder 6, a piston 7, a cylinder sleeve 8, and a lower joint 9. Wherein, the upper joint 2 and the lower joint 9 are arranged at two ends of the mandrel 1, and the mandrel 1 is provided with a pressure transmission hole 11. The end part of the mandrel 1, which is close to the upper joint 2, is sleeved with a guide cylinder 5, the plate spring 3 is sleeved on the guide cylinder 5, and the scraper 4 is sleeved at the middle position of the plate spring 3. One end of the plate spring 3 is connected with the upper joint 2, and the other end of the plate spring 3 is connected with the push cylinder 6. The push cylinder 6 is connected with the piston 7, the piston 7 is pre-fixed with the mandrel 1, the hydraulic cylinder sleeve 8 is sleeved on the piston 7, and the piston 7 is located at a position close to the pressure transfer hole 11. The guiding cylinder 5 has a certain curvature to guide the plate spring 3 and the scraper 4 to radially expand, and the plate spring 3 has an arch structure with a certain curvature to drive the scraper 4 to radially expand.
According to the variable-diameter sleeve scraper disclosed by the embodiment of the invention, the piston can axially move along the hydraulic cylinder sleeve through the hydraulic control system, so that the push cylinder drives the plate spring to move, and the radial expansion and contraction of the plate spring and the scraper can be effectively realized under the guiding action of the guide cylinder and the plate spring. Because the periphery of leaf spring and scraper does not have other spare parts to restrict its radial expansion, consequently, the width, thickness and the length of leaf spring are according to simply supported beam principle optimal design, can satisfy the leaf spring when opening the biggest bending stress and be less than material yield strength to can satisfy the needs of reducing size and scraping dynamics, thereby can cooperate current spring sleeve pipe scraper to adopt one time to scrape the scraping tubular column and accomplish the scraping of the compound sheathed tube of technical casing and tail pipe. In addition, the piston is pre-fixed on the mandrel, so that underground accidents caused by the fact that the scraper accidentally extends out due to the fact that hydraulic pressure or lifting and pressing tonnage exceeds the starting pressure of the plate spring in the processes of scraping a pipe column and other operations can be prevented. Therefore, according to the variable-diameter casing scraper provided by the embodiment of the invention, the purposes of shortening the scraping operation period, reducing the operation cost and improving the operation efficiency can be achieved on the premise of ensuring the safety of the scraping operation.
Specifically, as shown in fig. 1 and 4, in the present embodiment, the plate spring 3, the scraper 4, the guide cylinder 5, the push cylinder 6, and the piston 7 are symmetrically arranged on both sides of the pressure transfer hole 11. The two ends of the plate spring 3 close to the lower joint 9 are respectively connected with the push cylinder 6 and the lower joint 9, and the symmetrically arranged scrapers 4 are arranged in a staggered way. Through the scrapers of two sets of crisscross settings, can ensure to realize after two sets of scrapers reducing that 360 degrees do not have the dead angle and scrape, do not keep the clearance to further improve the efficiency of scraping and the quality of scraping of scraper.
Specifically, in the present embodiment, as shown in fig. 1, 3, 5, and 7, the plate spring 3 includes plate spring pieces 31 arranged uniformly in the circumferential direction, and both ends of the plate spring pieces 31 have a thickness greater than the middle thickness. The structure is convenient for installing fasteners at two ends of the plate spring, the plate spring is integrally designed into an arch shape with thick two ends and thin middle part and determined radian, on one hand, stress concentration can be avoided, and the plate spring is guided to drive the scraper to radially expand towards the inner wall of the sleeve. Specifically, in the present embodiment, the plate spring piece 31 is made of a spring steel material, and particularly preferably 60Si2 Mn. The material can ensure that the plate spring has higher tensile strength and higher yield strength, and has higher safety performance under the repeated dynamic load scraping environment. Specifically, in the present embodiment, as shown in fig. 8, the scraper 4 includes scraper blades 41 arranged uniformly in the circumferential direction, and scraper arcs 42 are provided at intervals on the scraper blades 41. By designing the scraper arc, the cutting force of the scraper blade can be increased to increase the scraping efficiency of the scraper.
Preferably, in the present embodiment, the scraper 4 comprises 4 scraper blades 41 uniformly arranged on the circumference of the tubular body with a radius of 50mm, and 3 sets of scraper arcs 42 are provided on each scraper blade 41. The radian and the arc radius of the scraper arc meet the requirement of scraping 177.8mm sleeves after reducing. Both ends of each scraper blade 41 are provided with 3 connecting pin holes, the connecting pin holes are arranged corresponding to the pin holes in the middle positions of the plate spring pieces 31, and each 1 scraper blade is connected with 3 plate spring pieces 31 through connecting pins 106. And the other scraper blades are arranged at intervals in a staggered manner along the circumferential direction, so that 306-degree 3-arc dead-angle-free scraping can be realized after the diameter of the two scraper blades 41 is reduced.
As shown in fig. 1, the reducer casing scraper 10 according to the embodiment of the present invention preferably further includes a limiting cylinder 101, the limiting cylinder 101 is disposed at an end of the pusher 6 away from the piston 7, and the limiting cylinder 101 is connected to the mandrel 1 by a connecting pin 106. The determined stroke is designed between the limiting cylinder and the piston, and the infinite diameter expansion of the plate spring can be limited while the requirement of the maximum stroke after the plate spring is started is met. Further, in the present embodiment, as shown in fig. 9, a one-way ratchet mechanism 102 is disposed on the body of the limiting cylinder 101 and the inner wall of the pushing cylinder 6, which are engaged with each other. Under the common cooperation of a limiting cylinder and a one-way ratchet, the effect of one-way limiting and stopping can be achieved, and the scraping force of the plate spring can be kept while the radial expansion of the plate spring is ensured to be in place.
Specifically, as shown in fig. 1, in the present embodiment, the piston 7 is pre-fixed on the mandrel 1 by the shear pin 103. The shearing pin structure not only can ensure the simple and compact structure of the scraper, but also can facilitate the piston to shear the pin to realize the diameter-changing function of the scraper through reasonable design while facilitating the pre-fixation of the piston. Further, in the present embodiment, sealing rings 104 are provided between the upper joint 2 and the lower joint 9 and the mandrel 1, and between the piston 7 and the cylinder sleeve 8 and the mandrel 1. The sealing ring can further avoid leakage in the working process of the scraper to influence the working efficiency and even cause safety accidents. Preferably, in this embodiment, the sealing ring is an O-ring, which can achieve better sealing effect.
Specifically, in the present embodiment, as shown in fig. 1, 2, 4, 6 and 10, the plate spring piece 31, the upper joint 2, the lower joint 9 and the push cylinder 6 are fixedly connected by the bolts 105. The mode of adopting the bolt fastening is simple and convenient, and is convenient for installation and maintenance, stable and reliable. Preferably, in the present embodiment, the ends of the upper joint 2 and the lower joint 9 close to the plate spring 31 and the ends of the push cylinder 6 close to the plate spring 31 are uniformly provided with a plurality of grooves along the circumferential direction, the width and depth of the grooves match with the size of the plate spring piece 31, and the screwing and unscrewing of the bolt 105 can be satisfied. Preferably, two ends of the plate spring piece 31 are respectively provided with 2 threaded holes, which are respectively arranged corresponding to the groove threaded holes on the upper joint 2, the lower joint 9 and the push cylinder 6.
Specifically, in the present embodiment, the guide cylinder 5 and the spindle 1 are connected by a connecting pin 106. Two ends of the mandrel 1 are respectively connected with the upper joint 2 and the lower joint 9 in a threaded connection mode, and the piston 7 is connected with the push cylinder 6 in a threaded connection mode.
The matching pipe column of the variable-diameter casing scraper 10 of the embodiment of the invention and the working process are as follows:
the scraper column is structurally designed with a GX/T-127 spring scraper and the reducing casing scraper 10 of the embodiment of the invention, and the bottom of the column is matched with a ball seat. In the initial state of the reducing casing scraper 10 provided by the embodiment of the invention, the plate spring 3 and the scraper 4 are basically in a straight line, and the outer diameter of the circumference is slightly smaller than the diameter of the GX/T-127 type scraper body, so that a tool can be conveniently put into a small casing. The lower small casing is first scraped off with a GX/T127 spring scraper. After scraping, the pipe column is lifted into a large sleeve, a ball is thrown, after the ball is in place, the pipe column is pressed to a design value, the pre-fixed shearing pin 103 of the upper piston and the lower piston is sheared, and the hydraulic cylinder sleeve 8 pushes the plate spring 31 to radially expand to a set position and then limit the position. The plate spring 31 is set to have elasticity and scraping force within a certain range, and can meet the requirement of conventional scraping. Meanwhile, two groups of scraper blades 41 distributed circumferentially are set to be distributed in a staggered manner at 360 degrees after being radially expanded, so that the inner diameter of the casing can be scraped at a full angle without dead angles. The scraping operation of 177.8mm and 127mm combined casings is completed by one trip of the pipe column.
According to the embodiment, the variable-diameter casing scraper can scrape a combined casing of a technical casing and a tail pipe by adopting a scraping pipe column once, and can achieve the aims of shortening the scraping operation period, reducing the operation cost and improving the operation efficiency on the premise of ensuring the safety of the scraping operation.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (7)
1. A variable-diameter casing scraper is characterized by comprising a mandrel, an upper joint, a plate spring, a scraper, a guide cylinder, a push cylinder, a piston, a hydraulic cylinder sleeve and a lower joint; wherein,
the upper joint and the lower joint are arranged at two ends of the mandrel, and a pressure transmission hole is formed in the mandrel;
the end part of the mandrel, which is close to the upper joint, is sleeved with the guide cylinder, the plate spring is sleeved on the guide cylinder, and the scraper is sleeved in the middle of the plate spring;
one end of the plate spring is connected with the upper joint, and the other end of the plate spring is connected with the push cylinder;
the push cylinder is connected with the piston, the piston is pre-fixed with the mandrel, the hydraulic cylinder sleeve is sleeved on the piston, and the piston is positioned close to the pressure transmission hole;
the guide cylinder is provided with a certain radian so as to guide the plate spring and the scraper to radially expand, the plate spring is of an arch structure with a certain radian so as to drive the scraper to radially expand,
the plate spring, the scraper, the guide cylinder, the push cylinder and the piston are symmetrically arranged on two sides of the pressure transfer hole; the two ends of the plate spring close to the lower joint are respectively connected with the push cylinder and the lower joint, and the symmetrically arranged scrapers are arranged in a staggered manner,
the plate spring comprises plate spring pieces which are uniformly arranged along the circumferential direction, the thickness of two ends of each plate spring piece is larger than that of the middle part of each plate spring piece,
the reducing sleeve scraper further comprises a limiting cylinder used for limiting the expanding range of the plate spring, the limiting cylinder is arranged at one end, far away from the piston, in the push cylinder, and the limiting cylinder is connected with the mandrel.
2. The variable diameter casing scraper according to claim 1, wherein the limiting cylinder body and the inner wall of the pushing cylinder are provided with one-way ratchet mechanisms which are matched with each other.
3. The reducer casing scraper according to claim 1 or 2, wherein the scraper comprises scraper blades arranged uniformly in a circumferential direction, and scraper arcs are provided at intervals on the scraper blades.
4. The reducer casing scraper according to claim 1 or 2, wherein the piston is pre-fixed on the mandrel by means of shear pins.
5. The variable diameter casing scraper according to claim 1 or 2, wherein sealing rings are provided between the upper joint and the lower joint and the mandrel, and between the piston and the hydraulic cylinder sleeve and the mandrel.
6. The reducing casing scraper according to claim 1 or 2, wherein the leaf spring is fixed to the scraper blade, the upper joint, the lower joint and the pusher by means of pin connections.
7. The reducer casing scraper of claim 1 or claim 2 wherein said leaf spring is made of spring steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010126785.2A CN113323630B (en) | 2020-02-28 | 2020-02-28 | Reducing casing scraper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010126785.2A CN113323630B (en) | 2020-02-28 | 2020-02-28 | Reducing casing scraper |
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| Publication Number | Publication Date |
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| CN113323630A CN113323630A (en) | 2021-08-31 |
| CN113323630B true CN113323630B (en) | 2023-01-31 |
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| CN202010126785.2A Active CN113323630B (en) | 2020-02-28 | 2020-02-28 | Reducing casing scraper |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116892378B (en) * | 2023-09-11 | 2023-12-19 | 大庆信辰油田技术服务有限公司 | Soluble bridge plug special for oil and gas well production increase |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2340150B (en) * | 1998-08-03 | 2002-09-18 | Smith International | Downhole scraper assembly |
| CA2499532C (en) * | 2004-03-11 | 2012-11-20 | Smith International, Inc. | Casing scraper |
| CN104653154B (en) * | 2015-02-25 | 2017-06-13 | 中国石油天然气股份有限公司 | Drifting and scraping integrated tool |
| CN106639983B (en) * | 2016-11-30 | 2018-12-14 | 中国海洋石油集团有限公司 | A kind of reducing casing pipeline scraper |
| CN108104771B (en) * | 2017-12-07 | 2020-07-03 | 中国海洋石油集团有限公司 | Large reducing sleeve cleaning tool |
| CN109209297B (en) * | 2018-10-27 | 2023-12-29 | 濮阳市东昊机械电子有限公司 | General scraping integrated tool |
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| CN113323630A (en) | 2021-08-31 |
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