A kind of waterpower sleeve pipe incised deviceTechnical field
The present invention relates to a kind of waterpower sleeve pipe incised device, belong to the inner cutting tool of petroleum gas down-hole casing field.
Background technology
In recent years, along with the fast development that demands for energy is increased severely day by day and offshore oil is industrial, the exploitation of deep water and ultra deep water oil well is more and more.Sleeve pipe is the indispensable material that deep water and ultra deep water hydrocarbon well are produced, so sleeve pipe is used by a large amount of in oil and gas development.And the sleeve pipe cutting is a requisite operation procedure in the processes such as cover pipe construction, ocean platform dismounting, abandoned well engineering.
Deep-sea sleeve pipe cutting technique mainly comprises cumulative cutting, chemical cleavage, diamond cut rope walking or dancing art, abrasive water-jet technology and machine cuts at present.Though every kind of cutting mode can both reach the cutting purpose; But various cutting modes all have certain defective: the cumulative cutting technique mainly is to lean on the destruction of explosive blasting that sleeve pipe is blown; The shortcoming of this cutting method is that the consumption of explosive is not easy control very much; Be prone to pollute and success rate extremely low, generally do not advise in the cutting of seabed sleeve pipe, using.The chemical cleavage technology is to utilize the chemical agent in the cutting tool to react; The chemical mordant that produces HTHP cuts off tubing string; But the chemical cleavage technology is accomplished and must be kept the combustion chamber inner dry under water when cutting; The sealing requirements of chemical cleavage device is very high, has limited its underwater use.Diamond cut rope walking or dancing art is to utilize wire rope cutting steel, the cement that is embedded with diamond particles and meet material; But this cutting technique only is suitable for cutting from appearance; And in cutting process, also need control the feed speed of instrument and the cutting speed of wire rope well; Pipe fitting after colleague's cutting can produce many burrs, need carry out after-treatment to pipe fitting.The abrasive water-jet technology is to develop a kind of very rapidly new technique this year; It is a kind of non-blasting type cutting; Can not produce shock wave, also can not produce adverse influence, but its cost is higher surrounding environment; Nozzle is easy to wear and need huge, complicated mulling sand-removing system, and these have all limited the application of this sort of technology in the cutting of seabed sleeve pipe.Machine cuts is a kind of more traditional cutting method; The machine cuts technology that is applied to the deep-sea is the same with the principle that milling cutter, lathe tool or the grinding wheel of land use cut; Its simple in structure, easy processing and manufacturing and cost are low; But during to multilayer tubing string decentraction, cutting efficiency is lower, and vibration is bigger in the cutting process.In addition, be at present Electrochemical Cutting technology, the laser cutting technique of conceptual phase in addition since technology that is that all right is ripe, temporary transient not seen widespread use is in the cutting of deep-sea sleeve pipe.
Summary of the invention
The objective of the invention is to: the deficiency to above-mentioned prior art provides a kind of water that utilizes
Mechanics principle from the inner cutting of down-hole casing post sleeve pipe, and can and be salvaged down-hole fish and casing hardware in well depth position cutting arbitrarily, and operating process waterpower sleeve pipe incised device simply and easily.
The present invention realizes above-mentioned purpose through following technical scheme:
A kind of waterpower sleeve pipe incised device; It is made up of housing, transition short circuit, overflow valve, push rod and cutter; It is characterized in that: housing upper end screw thread is equipped with the transition short circuit, through little spring overflow valve is installed in the housing of transition short circuit below, is respectively arranged with axial by-pass prot and radially by-pass prot on the overflow valve of little spring top and bottom one side; Radially through dog screw and big spring push rod is installed on the overflow valve of by-pass prot below; The housing and the push rod of big spring below are provided with shear pin, and the push rod bottom is provided with push shaft, through rotating shaft cutter are installed on the housing of push rod below one side; Cutter is provided with gathering sill, and cutter flexibly connects through gathering sill and push shaft.
The present invention's beneficial effect compared with prior art is:
1, having can be in cutting of any well depth position and the function of salvaging down-hole fish sleeve pipe and casing hardware.
2, in the sleeve pipe cutting process, change to judge whether cutting is accomplished according to the ground observation drilling liquid pressure, accurate and visual, convenient and reliable, can avoid judging by accident.
3, adopt overflow valve and in work progress, adopt the pitching that the adapts technology that builds the pressure, operating process is simple and convenient, and cutting efficiency is high.
4, this instrument has been conceived the cutter self-locking mechanism, makes cutter when beginning to cut, and can under the effect of push rod, stretch out body, receives next time in the body at big spring and push shaft effect when cutting is accomplished, and can be implemented in and realize the operation that pulls out of hole under the hydraulic action.
5, when cutting sleeve pipe and salvaging fish and casing hardware, shear pin and big spring are installed optionally; And operating process is simple and convenient.
Description of drawings
Accompanying drawing is the structural representation of waterpower sleeve pipe incised device.
Among the figure: 1, transition short circuit, 2, overflow valve, 3, axially by-pass prot, 4, little spring, 5, radially by-pass prot, 6, dog screw, 7, push rod, 8, big spring, 9, shear pin, 10, rotating shaft, 11, push shaft, 12, cutter, 13, gathering sill, 14, housing.
The specific embodiment
This waterpower sleeve pipe incised device is made up of housing 14, transition short circuit 1, overflow valve 2, push rod 7 and cutter 12; Housing 14 upper end screw threads are equipped with transition short circuit 1; Through little spring 4 overflow valve 2 is installed in the housing 14 of transition short circuit 1 below; Be respectively arranged with axial by-pass prot 3 and radially by-pass prot 5 on the overflow valve 2 of little spring 4 top and bottom one side, radially through dog screw 6 and big spring 8 push rod 7 be installed on the overflow valve 2 of by-pass prot 5 belows, the housing 14 and the push rod 7 of big spring 8 belows are provided with shear pin 9; Push rod 7 bottoms are provided with push shaft 11; Through rotating shaft 10 cutter 12 is installed on the housing 14 of push rod 7 belows one side, cutter 12 is provided with gathering sill 13, and cutter 12 flexibly connects through gathering sill 13 and push shaft 11.
Cutter 12 quantity of this waterpower sleeve pipe incised device are 3, on the circumference of housing 14, are uniformly distributed with.The cutter 12 of this cutter sweep can stretch out housing 14 under the effect of push rod 7 when cutting, receive next time in the housing 14 in the effect of big spring 8 and push shaft 11 when cutting is accomplished.
When cutting cover pipe construction, after pitching built the pressure, drilling liquid pressure made overflow valve 2 move down and close radially by-pass prot 5; Drilling fluid affacts pressure push rod 7 and it is moved down through axial by-pass prot 3 simultaneously, drives push shaft 11 simultaneously and moves down; Under the promotion of push shaft 11, cutter 12 stretches out housing 14 and produces cutting force and begin to cut the sleeve pipe operation; After sleeve pipe cut off, the drill string internal pressure descended, and on big spring 8 effect lower push-rods 7, moved, and cutter 12 is recovered in the housing 14, under the effect of fishing spear, will sleeve salvage during trip-out then.
When cutting and salvaging fish and casing hardware construction, before this waterpower sleeve pipe incised device is transferred, on the ground big spring 8 is removed, after pitching builds the pressure,
Drilling liquid pressure makes push rod 7 descending, drives push shaft 11 and moves down; Under the promotion of push shaft 11, cutter 12 stretches out housing 14 and produces cutting force and begins to cut the sleeve pipe operation; After sleeve pipe cut off, so owing to there are not big spring 8 push rods 7 to move on not understanding, push rod 7 can withstand cutter 12 always, cutter 12 can not be recovered in the housing 14, and housing 14 will be salvaged fish and casing hardware after the cutting when pulling out of hole then.