CN204113225U - Spring casing well scraper - Google Patents

Abstract

The utility model discloses a spring sleeve pipe drifting scraper belongs to oil field borehole operation technical field. At least comprises the following steps: the well dredging device comprises a body, a scraping blade seat, a spring, a scraping blade groove, a locking pressing block, an anti-loosening pressing plate and a well dredging block; the outer circumference of the body is provided with an upper scraping section, a middle scraping section and a lower shaft dredging section, the surfaces of the upper scraping section and the middle scraping section are respectively provided with scraping blade seats which are uniformly distributed along the circumference and are staggered with each other, and scraping blades are arranged in the scraping blade seats; the lower drifting section of the body is provided with a plurality of raised drifting blocks, and the drifting blocks and the scraping blades form a three-section type same-diameter structure integrating drifting and scraping. The system can be used for checking and verifying the trafficability of the well, removing impurities on the inner wall of the casing string, putting a set of pipe column, completing drifting and scraping operation at one time, shortening the operation time and the well occupying period, reducing the labor intensity and the operation cost of workover operation and improving the working efficiency.

Description

Spring casing well scraper

technical field

The utility model relates to the technical field of downhole operations in oil fields, in particular to a spring-type casing well scraper.

Background technique

Before oil testing and overhaul maintenance of oil, gas and water wells, two procedures are usually carried out: drilling first and then scraping. Firstly, according to the diameter of the casing, the API standard drilling gauge is selected to pass to the bottom of the artificial well to verify the passability of the wellbore. Ensure that the large-diameter and long tools can be smoothly lowered into the predetermined well depth; then lower the casing scraper to scrape the inner wall of the casing to remove impurities such as mortar, cement, hard wax, salt scale and blasthole burrs on the inner wall of the casing. In order to keep the inner wall of casing hanging smooth and regular, and prevent damage to tools such as well entry packers in the well.

In the process of realizing the utility model, the inventor found that the prior art has at least the following problems: the tools used in the conventional well drilling and scraping operations are independent well drilling gauges and scrapers, which need to be lowered into two sets of pipe strings respectively. There are disadvantages such as many operating procedures, low operating efficiency, high labor intensity, and prolonged well occupation period affecting oil and gas recovery.

Contents of the invention

In order to solve the problems of the prior art, the embodiment of the utility model provides a spring-type casing well scraper. Through the radial expansion and contraction of the scraping blade and the three-section same-diameter structure, the well scraping operation can be completed at one time, shortening the operation time and well occupation period. Described technical scheme is as follows:

A spring-type casing well scraper, at least including: a body, a scraper blade, a scraper blade seat, a spring, a scraper knife groove, a locking pressure block, an anti-loosening pressure plate, and a well block; the outer circumference of the body is provided with The upper scraping section, the middle scraping section, and the lower well passage section, the surfaces of the upper scraping section and the middle scraping section are respectively provided with scraping blade seats evenly distributed along the circumference, and are staggered from each other, and scraping blades are installed in the scraping blade seats ; The lower passage section of the body is provided with several raised passage blocks, which together with the scraping blade form a three-stage structure with the same diameter for the passage and scraping.

Specifically, a spring is installed in the hole provided on the inner surface of the scraping blade to drive the radial expansion and contraction of the scraping blade, and the outer surface of the scraping blade is provided with a right-handed spiral scraping groove.

Specifically, the upper part of the scraping blade is provided with a locking pressing block, and the upper part of the locking pressing block is provided with an anti-loosening pressing plate, which is fixedly connected with the body through an anti-loosening bolt.

Specifically, trapezoidal dovetail grooves evenly distributed along the circumference are provided on the outer circumference of the upper scraping section and the middle scraping section of the body, and trapezoidal locking pressure blocks are arranged in the trapezoidal dovetail grooves and are fixedly connected to the body by locking bolts.

Further, preferably, there are three locking blocks, which are evenly distributed along the circular track at 120°.

Further, preferably, there are three well blocks, which are evenly distributed at 120° along the circular trajectory, and the outer diameter of the well blocks is consistent with the outer diameter of the upper scraping section and the middle scraping section.

Further, there are several scraping blade seats, two of which are respectively arranged on the outer surfaces of the upper scraping section and the middle scraping section, which are symmetrical left and right, and are distributed in a cross shape up and down at the upper scraping section and the middle scraping section.

Further, three sets of scraping blade seats are arranged on the outer surfaces of the upper scraping section and the middle scraping section respectively, and are evenly distributed along the circular trajectory at 120°, and the three sets of scraping blades at the upper scraping section and the three sets of scraping blades at the middle scraping section The scraping blades are distributed 60° apart from each other.

Specifically, the top of the upper scraping section is connected to the upper joint, and the bottom of the lower drilling section is connected to the lower joint.

Specifically, the upper joint is provided with an internal thread to connect to an oil well string; the lower joint is provided with an external thread to connect with a well access tool.

The beneficial effects brought by the technical solution provided by the embodiment of the utility model are:

Through a comprehensive analysis of the workover process, the use functions of the two tools, the well gauge and the scraper, are combined into one to form a special tool for casing drilling and scraping. The radial expansion and three-stage The same-diameter structure design can be used to verify the passability of the wellbore, and can also remove the impurities on the inner wall of the casing, run in a casing string, and complete the well scraping operation at one time, shortening the operation time and well-occupancy period, and reducing the maintenance cost. Reduce the labor intensity and operating cost of well operations, and improve work efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the present invention. For example, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts.

Fig. 1 is a front half-sectional view of a schematic structural diagram of a spring-type casing well scraper provided by an embodiment of the present invention;

Fig. 2 is a cross-sectional view of A-A in Fig. 1 provided by the embodiment of the present invention.

The meanings of the symbols in the figure are as follows:

1 upper connector;

2 body, 2.1 upper scraping section, 2.2 middle scraping section, 2.3 lower well passage section;

3 lower joints, 4 scraping blades, 5 scraping blade seats, 6 springs, 7 scraping knife slots, 8 locking pressure blocks, 9 locking screws, 10 anti-loosening pressure plates, 11 anti-loosening screws, 12 well block.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the implementation of the present utility model will be further described in detail below in conjunction with the accompanying drawings.

Referring to Fig. 1, the embodiment of the utility model provides a spring-type casing well scraper, which at least includes: an upper joint 1, a body 2, a lower joint 3, a scraping blade 4, a scraping blade seat 5, a spring 6, Scraper groove 7, locking pressure block 8, locking screw 9, anti-loosening pressure plate 10, anti-loosening screw 11, well block 12 and other components; specifically, the body 2 is a hollow cylinder, and its outer circumference The upper processing includes an upper scraping section 2.1, a middle scraping section 2.2, and a lower well section 2.3, which is a three-section overall structure. The top of the upper scraping section 2.1 is connected to the upper joint 1, and the bottom of the lower well section 2.3 is connected to the lower joint 3; The surfaces of the scraping section 2.1 and the middle scraping section 2.2 are respectively turned and milled with scraping blade holders 5 evenly distributed along the circumference, and the scraping blade holders 5 of the upper scraping section 2.1 and the middle scraping section 2.2 are staggered from each other, and each scraping blade holder 5 A scraper blade 4 is installed, and each scraper blade 4 inner surface is provided with at least one round hole, and a spring 6 is installed in each hole, and the scraper blade 4 can radially expand and contract under the effect of spring 6, and each scraper blade 4 The outer surface is turned and milled with a right-handed spiral scraping knife groove 7; the upper part of the scraping blade 4 is provided with several locking pressure blocks 8, and the upper part of the locking pressure block 8 is provided with an anti-loosening pressure plate 10, through the anti-loosening bolt 11 and Body 2 is fixedly connected.

Also referring to Fig. 2, the outer circumference of the upper scraping section 2.1 and the middle scraping section 2.2 of the body 2 is provided with several trapezoidal dovetail grooves evenly distributed along the circumference, and each trapezoidal locking pressing block 8 is arranged on each trapezoidal dovetail In the groove, it is fixedly connected to the body 2 by the locking bolt 9. Taking three blocks as an example, the trapezoidal locking pressing blocks 8 are evenly distributed at 120° along the circumferential track.

The lower shaft section 2.3 of the body 2 is turned and milled with several raised shaft blocks 12. Taking three blocks as an example, the shaft blocks 12 are evenly distributed on the surface of the lower shaft section 2.3 at 120° along the circumferential track. The outer diameter of the well block 12 is consistent with the outer diameter of the upper scraping section 2.1 and the middle scraping section 2.2, and together with the radially telescopic scraping blade 4 constitutes a three-section structure with the same diameter that the well and scraping are integrated. The upper joint 1 is provided with internal threads for connecting oil well pipe strings; the lower joint 3 is provided with external threads for connecting well access tools, so that a set of pipe strings can be run in, and two well drilling and scraping can be completed at one time. Process work.

Further, there are several scraping blade seats 5, two of which can be respectively arranged on the outer surfaces of the upper scraping section 2.1 and the middle scraping section 2.2, which are left and right symmetrical, and are cross-shaped up and down at the upper scraping section 2.1 and the middle scraping section 2.2 distribution; three can also be arranged on the outer surface of the upper scraping section 2.1 and the middle scraping section 2.2 respectively, and they are evenly distributed along the circular track at 120°. The three sets of scraping blades 4 and the three groups of scraping blades 4 at the middle scraping section 2.2 are distributed staggered by 60° from each other.

The usage method and working principle of the utility model embodiment:

During the scraping operation of oil, gas and water wells, the upper joint 1 is connected to the end of the pipe string through internal threads, so that the upper scraping section 2.1, the middle scraping section 2.2, and the lower well section 2.3 form an overall well opening structure, which is lowered to the bottom of the well. Or the design depth, and verify the passageability of the casing.

Before going into the well, under the action of the spring 6, the scraper blade 4 is slightly larger than the outer diameter of the body 2 by about 2 to 5mm. The upper and lower sets of scraping blades 4 at the upper scraping section 2.1 and the middle scraping section 2.2 form a scraping circular trajectory, and the scraping operation on the inner wall of the casing can be realized by repeatedly pulling at the pre-scraping position.

In addition, the embodiment of the utility model has the following advantages: reasonable design, compact structure, reliable performance, and convenient use.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (10)

1. a spring sleeve pipe drifting scraper, at least comprises: body, scraping blade, type scraping knife bar, spring, type scraping knife groove, locking briquetting, locking pressing plate, drifting block; It is characterized in that, described body excircle is provided with scraping section, middle scraping section, lower drifting section, the surface of described upper scraping section and middle scraping section is respectively arranged with circumferentially equally distributed type scraping knife bar, and mutually staggers, and is provided with scraping blade in described type scraping knife bar; The lower drifting section place of described body is provided with several protruding drifting blocks, forms with scraping blade the same gauge structure of syllogic that drifting and scraping be integrated.

2. spring sleeve pipe drifting scraper according to claim 1, is characterized in that, be provided with spring in the hole that described scraping blade inner surface is arranged and drive scraping blade radial expansion, described scraping blade external surface is provided with the spiral type scraping knife groove of dextrorotation.

3. spring sleeve pipe drifting scraper according to claim 1, it is characterized in that, described scraping blade top is provided with locking briquetting, and described locking briquetting top is provided with locking pressing plate, is connected firmly by check bolt and body.

4. spring sleeve pipe drifting scraper according to claim 1, it is characterized in that, upper scraping section and the middle scraping section excircle of described body are provided with circumferentially equally distributed trapezoidal dovetail groove, and trapezoidal locking briquetting is arranged in trapezoidal dovetail groove, is connected firmly on body by lock bolt.

5. spring sleeve pipe drifting scraper according to claim 1, is characterized in that, described locking briquetting is good with three pieces, and circumferentially track is uniformly distributed with 120 °.

6. spring sleeve pipe drifting scraper according to claim 1, is characterized in that, described drifting block is good with three pieces, and circumferentially track is uniformly distributed with 120 °, and described drifting block external diameter and upper scraping section, middle scraping section external diameter are consistent.

7. spring sleeve pipe drifting scraper according to claim 1, it is characterized in that, described type scraping knife bar is several, arranges two respectively in upper scraping section and middle scraping section external surface, symmetrical, and be crossing distribution up and down in upper scraping section and middle scraping section place.

8. spring sleeve pipe drifting scraper according to claim 1, it is characterized in that, described type scraping knife bar arranges three respectively in upper scraping section and middle scraping section external surface, circumferentially track is 120 ° and is uniformly distributed, and three groups of scraping blades at three groups of scraping blades at upper scraping section place and middle scraping section place mutually stagger 60 ° and distribute.

9. spring sleeve pipe drifting scraper according to claim 1, is characterized in that, the top connection of described upper scraping section top attachment, connects lower contact bottom lower drifting section.

10. spring sleeve pipe drifting scraper according to claim 9, is characterized in that, described top connection is provided with internal thread and connects oil well pipe; Described lower contact is provided with external screw thread and connects into well tool.