CN201162508Y

CN201162508Y - Sizing scraper

Info

Publication number: CN201162508Y
Application number: CNU2008200788698U
Authority: CN
Inventors: 刘晓辉; 王志强; 魏延富
Original assignee: HOLDING ENERGY PETROLEUM ENGINEERING (BEIJING) Co Ltd
Current assignee: HOLDING ENERGY PETROLEUM ENGINEERING (BEIJING) Co Ltd
Priority date: 2008-01-31
Filing date: 2008-01-31
Publication date: 2008-12-10
Anticipated expiration: 2018-01-31

Abstract

The utility model provides a sizing tube scraper. The lower end of the upper joint of the sizing tube scraper is connected with the upper end of a main body; the upper end of the upper joint is provided with a thread used to connect the drill pipe; a drive piston sealed with the axial hole in a sliding way is arranged in the axial hole of the main body; a reset spring is arranged between the lower part of the piston and the lower end of the main body; the piston is provided with an axial hole; the lower end of the axial hole is provided with a nozzle made of cemented carbide; radial blade holes are arranged on the main body, and a blade which can move in the radial direction is arranged in each blade hole; the bottom end of each blade is an inclined plane matched with the circumference of the drive piston. The sizing tube scraper has the advantages that the blades retract when passing by the non-subsidiary segment of casing and stretch out when passing by the subsidiary segment of casing, thereby not only reducing the damages to the internal wall of the non-subsidiary segment of casing, but also completing the sizing scraping of the internal wall of the subsidiary segment of casing.

Description

Sizing scraper

Technical field

The utility model relates to a kind of sizing scraper, is mainly used in the expansion tube casing damaged well repairing construction of oil exploration and exploitation.

Background technology

The sizing scraping is one common operation in the workover treatment, also is one indispensable preparatory process in the expansion tube casing damaged well repairing construction.It mainly acts on is to scrape away the foreign material that deposit on the subsidy section internal surface of sleeve pipe and can carry out the shaping reparation to sleeve pipe micro-strain.In the construction operation process of general down-hole, be to use and mill awl and finish this procedure.But owing to mill the outside dimension of awl is changeless, thereby milling the shortcoming that taper thread grinding mills is sleeve pipe to be carried out whole milling from top to bottom, therefore just might cause to a certain extent damage to non-subsidy section sleeve pipe, gently then can influence its mechanical strength by the scratch internal surface of sleeve pipe, heavy then worn out sleeve pipe influence is produced and is caused the accident.

Summary of the invention

The purpose of this utility model just provides a kind of sizing scraper, may cause the to a certain degree problem of damage to non-subsidy section sleeve pipe with what the solution prior art existed.

The technical solution of the utility model is: the lower end of its top connection is connected with the upper end of body, is provided with in the upper end of this top connection to be used for the screw thread that is connected with drilling rod; Driven plunger with its slipper seal is housed in the axle center hole of described body, and side face is equipped with sealed picture on the top of this piston, between the lower end of this lower part of piston and body back-moving spring is housed; Be provided with axle center hole at this piston, be provided with carboloy nozzle in the lower end of this axle center hole; Be provided with blade aperture radially on described body, in each this blade aperture the blade that can move radially be housed, the bottom of this blade and the side face of described driven plunger are the inclined plane that cooperatively interacts; Locating ring is equipped with in upper end at the axle center hole of described body.

The utility model has the advantages that: be lowered in the process of casing patching position at sizing scraper, no liquid is injected, blade is in the state of ejection, and its external diameter is less, can not cause damage to non-subsidy section internal surface of sleeve pipe substantially in transferring process; When sizing scraper is transferred to upper end, appointment subsidy position, squeeze into certain pressure liquid, make blade be in the ejection state, reach appointment and require external diameter, transfer to scrape by rotation again and mill the master operation that fulfils assignment; Sizing scrape mill finish after, stop the rotation and release, under the effect of back-moving spring, the blade sizing scraper body that rebounds recovers to carry out behind the less external diameter to carry, and proposes sleeve pipe and finishes whole procedure.wholely transfer, on carry in the process, can reduce damage to non-subsidy section internal surface of sleeve pipe, can finish sizing scraping again to subsidy section internal surface of sleeve pipe.

Description of drawings

Fig. 1 is general structure of the present utility model (blade a does not stretch out) cross-sectional schematic;

Fig. 2 is general structure of the present utility model (blade stretches out a state) cross-sectional schematic.

The specific embodiment

Referring to Fig. 1 and Fig. 2, the lower end of top connection 1 of the present utility model is connected with the upper end of body 2 by screw thread 9, is provided with in the upper end of this top connection 1 to be used for the screw thread 10 that is connected with drilling rod.Driven plunger 3 with its slipper seal is housed in the axle center hole of described body 2, side face is equipped with sealing ring 15 on the top of this piston 3, outer peripheral face in the bottom of this piston 3 is equipped with back-moving spring 7, and the lower end of back-moving spring 7 places on back-up ring 13 inner faces that are loaded in the body 2 axle center hole lower ends.Be provided with axle center hole at this piston 3, be provided with carboloy nozzle 8 in the lower end of this axle center hole.Diverse location vertically at the middle part of described body 2 is provided with two groups of slotted holes radially, and every group leader hole is provided with two and evenly distribute along circumference at least.The convex blade 4 that can move radially respectively is housed, and each is limited in the described slotted hole with the shoulder of fixed block 5 with the convex blade at the two ends of slotted hole in each this slotted hole.The bottom of described convex blade 4 part corresponding with the outer peripheral face of described driven plunger 3 is provided with the inclined plane (side face that is driven plunger 3 is a taper seat) that cooperatively interacts.The group number of the setting of convex blade 4 and every group number can be determined according to concrete size and needs.Locating ring 12 is equipped with in upper end at the axle center hole of described body 2.

The utility model screw thread 10 of top connection 1 upper end in use is connected with drilling rod, and the course of work is as follows:

The utility model is sent into subsidy section upper end by drilling rod or oil pipe, in tubing string, squeeze into the liquid of certain pressure, because the throttling action of driven plunger 3 and nozzle 8, driven plunger 3 is descending, thereby make the conical surface promotion blade 4 on the driven plunger 3 stretch out body 2 outer (as shown in Figure 2), reach the requirement external diameter; Ground rotation tubing string, sizing scraper blade 4 can carry out scraping to internal surface of sleeve pipe, removes foreign material and micro-strain on the internal surface of sleeve pipe, guarantees that internal surface of sleeve pipe reaches the subsidy requirement.

After scraping finishes, stop to suppress, driven plunger 4 is up under the effect of back-moving spring 7, gets back to original position, in the blade 4 withdrawal bodies 2, carries on then, finishes the operation of scraping operation.

Claims

1, a kind of sizing scraper is characterized in that: the lower end of its top connection (1) is connected with the upper end of body (2), is provided with in the upper end of this top connection (1) to be used for the screw thread that is connected with drilling rod; Driven plunger (3) with its slipper seal is housed in the axle center hole of described body (2), sealing ring is housed, between the lower end of the bottom of this piston (3) and body (2), back-moving spring is housed at the top side face of this piston (3); Be provided with axle center hole at this piston (3), be provided with carboloy nozzle in the lower end of this axle center hole; Be provided with blade aperture radially on described body (2), in each this blade aperture the blade that can move radially be housed, the side face of the bottom of this blade and described driving plug (3) is the inclined plane that cooperatively interacts; Locating ring (12) is equipped with in upper end at the axle center hole of described body (2).

2, sizing scraper according to claim 1 is characterized in that: described blade is convex, and each is limited in the described blade aperture with the shoulder of a fixed block with the convex blade in the outside, two ends of described blade aperture.

3, sizing scraper according to claim 1 and 2 is characterized in that: back-up ring (13) is housed in the lower end of described body (2) axle center hole, and the lower end of described back-moving spring (7) fixes on the inner face of this back-up ring (13).