CN2502004Y

CN2502004Y - Hydraulic inner cutter

Info

Publication number: CN2502004Y
Application number: CN 01234195
Authority: CN
Inventors: 董合健; 吕宗高; 龚伟民; 段力军; 王中杰
Original assignee: Drilling Engineering Technology Research Institute Of Zhongyuan Petroleum Exploration Bureau Sinopec
Current assignee: Drilling Engineering Technology Research Institute Of Zhongyuan Petroleum Exploration Bureau Sinopec
Priority date: 2001-08-22
Filing date: 2001-08-22
Publication date: 2002-07-24
Anticipated expiration: 2011-08-22

Abstract

The utility model discloses a hydraulic inner cutter comprising an upper tie-in, a body, a cutting knife and a cylinder rob; and a big spring is arranged between the cylinder rob and the body and the upper part of the cylinder rob is provided with a spillover valve assembly. The utility model has the advantages that 1. the utility model provides the spillover valve and corresponding pitching and the pressing technique in the construction, so as to make the tool drill smoothly and has a high, accurate and convenient judgment of the work under the well from the ground; 2. a cutter self-locking mechanism is designed to make the cutter return into the body with the help of the big spring and the cylinder rob after a bushing is cut by a cutter; 3. according to the needs of the site operation, a cutter pin can be arranged between the cylinder rob and the body optionally matching with the big spring to reach the effects of not only cutting the free section bushing but also salvaging the well bushing and a bushing accessory.

Description

Waterpower formula internal cutter

The utility model relates to that inside extracts the sleeve pipe construction tool under a kind of oil drilling overhaul sidetracked hole.

Extracting the special tool of using in the cover pipe construction at the overhaul sidetracking at present is ND-S type waterpower internal cutter.It is made up of parts such as body, piston push rod, spring, cutter hub, pins, and the major defect of this cutter is: 1, can only judge the down-hole construction results according to torque, erroneous judgement occur through regular meeting; 2, cutter hub only freely is suspended on the body by pin, also can reach externally at small external force effect lower knife body, so cutter easily is hampered in transferring process, can not retract to after cutting off sleeve pipe in the cutter hub groove; 3, for down-hole fish sleeve pipe and casing hardware, this instrument only can cut and can not autotelicly salvage, and is very not convenient to unit in charge of construction.

The purpose of this utility model is exactly the shortcoming that overcomes prior art, and a kind of waterpower formula internal cutter is provided.

The purpose of this utility model is achieved in that waterpower formula internal cutter is made up of top connection and body, the bottom of body is provided with cutter, piston rod is housed in the body, the lower end of piston rod is hook-shaped, can tangle the rear projection position of cutter, be provided with big spring between piston rod and the body, on the body of big spring bottom, have and the corresponding hole that cuts off of piston rod, overflow valve is equipped with on the top of piston rod, between piston rod and overflow valve, little spring is housed, insert in the center hydrophthalmia of piston rod the overflow valve middle and lower part, the overflow valve middle part radially has spout hole, the overflow valve bottom has a slotted hole and is communicated with the center hydrophthalmia, makes the head that is fixed on the dog screw on the piston rod by screw thread can insert this hole overflow valve is positioned with spacing, and overflow valve taper hole section also has along the circumferential direction uniform axial by-pass prot.

The utlity model has following advantage: 1, the present invention has conceived overflow valve and adopted the pitching adapt the with it technology that builds the pressure in work progress, and instrument is made a trip freely, ground judge the underground work visual result, accurately, convenient; 2, the present invention has conceived the cutter self-locking mechanism, and cutter can be retracted in the body under the effect of big spring and piston rod after cutting off sleeve pipe, can solve the problem that can't pull out of hole smoothly after existing fluid power internal cutter construction finishes; 3, the present invention can install to cut off between piston rod and body and make it select to use with big spring according to the site operation needs, reaches the effect that not only can cut free section sleeve pipe but also can cut and salvage down-hole fish sleeve pipe and casing hardware.

Below in conjunction with accompanying drawing the utility model is described further:

Fig. 1: waterpower formula internal cutter structural representation;

Among the figure: 1-top connection, 2-overflow valve, 3-by-pass prot, 4-little spring, 5-spout hole,

6-sealing ring, 7-dog screw, 8-piston rod, 9-big spring, 10-cut off the hole,

11-cutter, 12-body;

Waterpower formula internal cutter is made up of top connection 1 and body 12 as shown in Figure 1, top connection 1 is threaded with body 12, the bottom of body 12 is provided with cutter 11, piston rod 8 is housed in the body 12, be provided with big spring 9 between piston rod 8 and the body 12, overflow valve 2 is equipped with on the top of piston rod 8, between piston rod 8 and overflow valve 2, little spring 4 is housed, insert in the center hydrophthalmia of piston rod 8 overflow valve 2 middle and lower parts, overflow valve 2 middle parts radially have spout hole 5, rush down pressure after being used to cut off sleeve pipe, overflow valve 2 bottoms have a slotted hole and are communicated with the center hydrophthalmia, making the head that is fixed on the dog screw 7 on the piston rod 8 by screw thread can insert this hole positions with spacing overflow valve 2, overflow valve 2 taper hole sections also have along the circumferential direction uniform axial by-pass prot 3, be used for water conservancy diversion, on the body 12 of big spring 9 bottoms, have and the piston rod 8 corresponding holes 10 that cut off, be used for placement and cut off drilling fluid.The lower end of piston rod 8 is hook-shaped, can tangle the rear projection position of cutter 11, can be with cutter hub 11 to retract in the body automatically by design and construction requirement at the effect lower piston rod 8 of big spring 9.

When sleeve pipe cutting construction process, with instrument down to cutting position, pitching in drill string, the dead brake lever of stopping starts rotating disk, and pump into drilling fluid in drill string, the drilling liquid pressure effect makes little spring 4 compressions, overflow valve 2 is descending and close spout hole 5.Simultaneously, drilling fluid also affacts piston rod 8 by by-pass prot 3 with pressure and makes it descending promotion cutter hub and carry out cutting work.After cutting off sleeve pipe, rush down pressure because differential pressure action spout hole 5 is opened, drilling fluid flows into annular space rapidly by overflow valve body by-pass prot 3, spout hole 5 and piston rod center hydrophthalmia.At this moment, little spring 4 drives overflow valves and resets, and piston rod 8 promotes by spring force and resets, on carry drill string, blade is retracted in the body, trip-out can trip out internal cutter.

In needs cuttings and when salvaging down-hole fish sleeve pipe and casing hardware, big spring 9 is not installed and in cutting off hole 10, is installed and cut off, by cutting off body 12 is connected with piston rod 8.After pitching builds the pressure, drilling liquid pressure opens piston rod 8 descending promotion cutters, consequent cutting force makes cutter cut the sleeve pipe operation, when sleeve pipe cuts off the effect of back owing to overflow valve, pressure descends rapidly, so but because of there not being big spring 9 piston rods 8 can be not up, piston rod 8 can withstand cutter hub always, the cutter hub retraction is less than in the cutter hub groove, and cutter hub will be salvaged the down-hole fish sleeve pipe and the casing hardware that cut off when pulling out of hole like this.

Claims

1, a kind of waterpower formula internal cutter is made up of top connection (1) and body (12), top connection (1) is threaded with body (12), the bottom of body (12) is provided with cutter (11), it is characterized in that: piston rod (8) is housed in the body (12), be provided with big spring (9) between piston rod (8) and the body (12), overflow valve (2) is equipped with on the top of piston rod (8), between piston rod (8) and overflow valve (2), little spring (4) is housed, insert in the center hydrophthalmia of piston rod (8) overflow valve (2) middle and lower part, overflow valve (2) middle part radially has spout hole (5), overflow valve (2) bottom has a slotted hole and is communicated with the center hydrophthalmia, make the head that is fixed on the dog screw (7) on the piston rod (8) by screw thread can insert this hole overflow valve (2) is positioned with spacing, overflow valve (2) taper hole section also has along the circumferential direction uniform axial by-pass prot (3).

2, waterpower formula internal cutter according to claim 1 is characterized in that having on the body (12) of big spring (9) bottom and the corresponding hole (10) that cuts off of piston rod (8).

3, waterpower formula internal cutter according to claim 1, the lower end that it is characterized in that described piston rod (8) is hook-shaped, can tangle the rear projection position of cutter (11).