Hydraulic spinning type controllable abrasive material jet cutting apparatus and method of operating thereof
Technical field
The invention belongs to the water-jet technology field, particularly relate to a kind of hydraulic spinning type controllable abrasive material jet cutting apparatus and method of operating thereof that is used to handle the discarded well head of offshore oil.
Background technology
Processing for the offshore production platform submerged structure; at present existing a lot of technological development are come out; but because various complex conditions under water; cutting construction is still relatively more difficult; especially will be according to the requirement of law of marine environmental protection, excise platform leg and discarded well head fully, remove at the following certain depth of mud face place on the ocean bottom, therefore still is necessary to further develop and improve cutting technique under water; particularly develop cutting technique under the mud, the research of this respect also belongs to blank at present.Present existing cutting technique mainly contains: the thermic lance cutting, owing to can produce a large amount of dense smoke in cutting process, its burning velocity makes operating personnel to control in 2~3m distance, so the thermic lance cutting is difficult to control; Shot-drilling cable cutting is also used in industrial gas oil for many years to some extent, when blowout and oil well taking place catch fire, just need adopt this technology to carry out the long-range cutting of well head but its expense costliness, and underwater operation is very complicated; CUMULATIVE BLASTING cutting is to be used for to the excision of waterproof casing below the mud line and low profile catheter frame pipeline etc., but this blasting method can not be applied to heavy reinforced concrete platform spud leg, because the cutting effect that explosive sprays can not show a candle to cutting steel plate, and the explosive order of magnitude that uses is very big.Repeatedly underwater demolition is very big to the influence of the animal in the ocean in addition, and the fish glue of fish is very responsive to the shock wave of explosion, and therefore easy breeding and growth to economic fish causes adverse effect, also causes environmental pollution simultaneously; The machinery cutter cuts the cutting that is applicable to the individual layer tubing string under water, and it can circumferentially cut pipe fitting along pipe, and when being filled with the situation of cement sheath in running into multilayer pipe band of column shape space, cutting efficiency is very low, and as easy as rolling off a log generation mechanical breakdown; The principle of Abradant efflux cutting technology is to be mixed with the high-pressure water jet that resembles this stone abrasive particle of diamond dust or garnet, utilizes the hardness of abrasive particle and to the corrasion of cutting material, increases the cutting power of pure water under high pressure water jet.
In the world, the research of Submerged Abrasive had some successful examples, and 1984, the invention of Fluidyne company was also tested a kind of new multiply water jet nozzle, can spray high-octane abrasive water-jet.The experiment show and can when pressure is 100MPa (perhaps lower), cut many hard materials, the traversing speed of nozzle is greater than 15cm/min, the abrasive material consumption is less than 1.0Kg/min.With the cutting of this nozzle success hard rock, pottery, composite and metalliferous material.1986, domestic Jiaozuo Mine Industry College carried out deep research to abradant jet cutting, managed to make abradant jet can be effectively to contact and don't reduce its speed with being cut object, had studied the cutting power of abradant jet under the different spray angles in view of the above.At the end of the eighties, Hanoverian, Germany university utilizes Submerged Abrasive that steel have been carried out cutting test, to seek the actual parameter development of submerged jets.1991, this realized the abrasive material slurry jet flow test under the 345MPa M. Hash, and test shows that the cutting effect of abradant jet is better under the high pressure; R.H.Hollinger etc. utilize high-speed photography to analyze fluidic architecture at the influence of slurry rheology to cutting effect, and analyze otch variation etc., find that viscoplasticity slurry performance is better than other non-viscoplasticity slurries.These researchs both domestic and external at present, fully represented the underwater erosion property of abradant jet, greatly enriched the development of abradant jet, also provide new thinking simultaneously for novel processing technology and increase environmental effect, rise day by day along with the human development ocean, cutting technique has a wide range of applications in the engineering under water under water, is one of key core technology of 21 century.Because the working environment of high undersea hydrostatic pressures influence and underwater complex, can not adapt to such an extent as to make traditional processing method become more and more difficult when operating mode is used under water, so underwater abrasive water jet cutting tool and method of operating thereof have become various countries' engineering research personnel's focus.The present invention just conducts a research under such background.
Summary of the invention
The present invention for solve the technical problem that exists in the known technology provide a kind of can the down-hole certain depth with the well inner sleeve along circumferentially cut off and otch accurately totally, the hydraulic spinning type controllable abrasive material jet cutting apparatus and the method for operating thereof that can not pollute marine environment.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is:
A kind of hydraulic spinning type controllable abrasive material jet cutting apparatus, it is characterized in that: comprise urceolus, central shaft, bearing, speed control mechanism, high pressure sand control mechanism, cutting head and abradant jet nozzle, central shaft and speed control mechanism are installed in urceolus, be fixed with high pressure sand control mechanism respectively in central shaft upper end and middle and lower part, the urceolus upper end is connected with oil pipe, the lower end screw thread is fixed with gland, cutting head is connected with the central shaft that extends the urceolus lower end by taper pipe thread, on the same horizontal plane of cutting head, be provided with four abradant jet nozzles at least, wherein two abradant jet nozzle-axis and cutting head axial line intersect, be straight abradant jet nozzle, in addition two abradant jet nozzle-axis are offset certain distance with the cutting head axial line, be biasing abradant jet nozzle, be the arm of couple of jet reaction force, the scope of this arm of couple is at 100-150mm.
The present invention can also adopt following technical measures:
Described speed control mechanism is by outer tube inner chamber, is evenly distributed in the middle of the central shaft small sircle hole on the ledge excircle and the rectangular thread of cylindrical constitutes together.
Described high pressure sand control mechanism comprise dust ring, filter, the filter gland that is threaded with filter and be installed in filter and the filter gland between the sand control filter screen.
The method of operating of described hydraulic spinning type controllable abrasive material jet cutting apparatus is characterized in that: comprise the steps:
The cutting of discarded oil well also comprises following conventional auxiliary equipment: sand tank car, auger, fracturing blender truck, fracturing unit truck, measuring truck, high-pressure anti-wear sebific duct, wellhead hookup, well head centralizer, high-pressure oil pipe and down-hole centralizer.
It is characterized in that: comprise following operating procedure:
A. on cargo ship, in turn hydraulic spinning type controllable abrasive material jet cutting apparatus, down-hole centralizer, high-pressure oil pipe, well head centralizer, wellhead hookup and high-pressure anti-wear sebific duct are connected, add encapsulant, to prevent high pressure leaks at the joint screw thread;
B. above-mentioned hydraulic spinning type controllable abrasive material jet cutting apparatus, down-hole centralizer, high-pressure oil pipe, well head centralizer, wellhead hookup and high-pressure anti-wear sebific duct etc. are lowered in the abandoned well that needs cutting, and the top connection of high-pressure anti-wear sebific duct is connected with fracturing unit truck;
C. adopt the high-pressure anti-wear sebific duct that fracturing unit truck, fracturing blender truck are connected by oil, and by cable measuring truck and fracturing unit truck are connected the ninth of the ten Heavenly Stems;
D. start fracturing unit truck, earlier in high-pressure anti-wear sebific duct, high-pressure oil pipe and hydraulic spinning type controllable abrasive material jet cutting apparatus, pump into clear water, be forced into the required operating pressure of abandoned oil casing that is cut, this pressure remains in 30~50Mpa scope, about 5 minutes of voltage stabilizing;
E. keep above-mentioned force value stable, in fracturing blender truck, add cutting sand by sand tank car, auger again, be transported in wellhead hookup, well head centralizer and the high-pressure oil pipe by the high-pressure anti-wear sebific duct through mixed high-pressure abrasive material slurry;
F. the high-pressure abrasive material slurry enters the urceolus of hydraulic spinning type controllable abrasive material jet cutting apparatus by high-pressure oil pipe, after filtering through high pressure sand control mechanism, liquid in wherein a part of high-pressure abrasive material slurry enters the annular space between central shaft and the urceolus, on dust ring in the maintenance high pressure sand control mechanism, under pressure balance, this partially liq is the admission velocity controlling organization inner chamber that can not continue to flow downward owing to the high-pressure seal ring effect of urceolus inside, thereby the frictional resistance that guarantees dust ring is enough little, and can guarantee that again speed control mechanism can for a long time stable work.All the other high-pressure abrasive material slurries flow into cutting head by the endoporus of central shaft, the high-pressure abrasive material slurry that enters cutting head forms the high speed abradant jet through the abradant jet nozzle, the effect that enters the reaction force that the abradant jet of two biasing abradant jet nozzles forms this moment produces a rotation torque to cutting head, promote the rotation of cutting head and central shaft, the abradant jet that penetrates by four abradant jet nozzles on the cutting head circumferentially cuts off along it oil well casing, and described rotary speed is controlled by the size that is filled in the viscous force of tackifier between central shaft and the urceolus.
G. when pressure was 30Mpa, control was about 10 minutes clipping time; When pressure is 50Mpa, control is about 8 minutes clipping time, when arriving the scheduled time, stop in fracturing blender truck, to add sand, and continue in hydraulic spinning type controllable abrasive material jet cutting apparatus, to pump into clear water about 15 minutes according to well depth, abrasive material slurry in the well is cleaned, replaces, close fracturing unit truck, finish the cutting of discarded well head.
The diameter of two biasing abradant jet nozzles of cutting head is: 2.4mm, the diameter of two straight abradant jet nozzles is 3mm in addition.
The rotary speed of described abradant jet nozzle is: 3rpm~30rpm.
Described abrasive material slurry weight percent concentration is 17%~25%.
The abrasive grain particle diameter of described formation abrasive material slurry is: 0.1~0.8mm.
Described tackifier are selected steam turbine oil for use, and its viscosity is at 2~100mm
2Between/the s.
Advantage and good effect that the present invention has are: because cutter sweep of the present invention is to utilize the hardness of abrasive particle and to the corrasion of cutting material, increase the cutting power of pure high-pressure water jet, this device can be inserted in the abandoned well that the depth of water is 360m~500m well inner sleeve edge is circumferentially cut off, therefore can not be subjected to the restriction of underwater complex cutting environment; The marine environmental pollution that not only can avoid the CUMULATIVE BLASTING cutting to cause, and can be to the animal in the ocean, especially the breeding of economic fish and growth exert an influence; This device speed control mechanism increases the control that viscosity resistance realizes rotary speed by the special tackifier of filling between outer tube inner chamber and the central shaft, it not only can cut steel pipe, but also can cut cement filler and reinforced concrete structure, guarantee that otch is accurately, totally; In addition this cutter sweep also have cutting efficiency height, cost low, simple in structure, use reliable and characteristics such as the life-span is long.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is central shaft of the present invention and speed control mechanism structural representation;
Fig. 3 is a sand control structural scheme of mechanism of the present invention;
Fig. 4 is a cutting head structural representation of the present invention;
Fig. 5 is the A-A cutaway view of Fig. 4;
Fig. 6 is an abradant jet nozzle arrangements schematic diagram of the present invention.
Fig. 7 is the on-the-spot schematic diagram of cutting operation of the present invention.
Among the figure: 1 urceolus, 2 high pressure sand control mechanisms, the 2-1 dust ring, the 2-2 filter, 2-3 sand control filter screen, 2-4 filter gland, 3 bearings, 4 central shafts, the 4-1 inlet opening, 5 speed control mechanisms, the 5-1 small sircle hole, the 5-2 rectangular thread, 6 urceolus glands, 7 high-pressure seal rings, 8 cutting heads, 9 straight abrasive jets, 10 biasing abrasive jets, 11 sand tank cars, 12 augers, 13 fracturing blender trucks, 14 fracturing unit trucks, 15 measuring trucks, 16 high-pressure anti-wear sebific ducts, 17 wellhead hookups, 18 well head centralizers, 19 high-pressure oil pipes, 20 down-hole centralizers, 21 hydraulic spinning type controllable abrasive material jet cutting apparatus.
The specific embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
See also Fig. 1-Fig. 6, hydraulic spinning type controllable abrasive material jet cutting apparatus, this device comprises urceolus 1, central shaft 4, bearing 3, speed control mechanism 5, high pressure sand control mechanism 2, cutting head 8 and abradant jet nozzle 9,10, central shaft 4 and speed control mechanism 5 are installed in urceolus, this center is hollow, the mid portion external diameter protrudes, this projection cylindrical is provided with rectangular thread, the central shaft upper end has the oval inlet opening 4-1 of 4 side direction, the mixture of being convenient to abrasive material and water under high pressure is from wherein passing through, the central shaft outer surface must have higher fineness and wearability, can reduce frictional resistance like this and prevent that its outer surface from being worn and torn by abrasive grain, described speed control mechanism is by outer tube inner chamber, being evenly distributed in the middle of the central shaft small sircle hole 5-1 on the projection excircle and the rectangular thread 5-2 of cylindrical constitutes together, special tackifier are housed in it, come the rotary speed of further control centre axle by the viscosity resistance of tackifier.Be fixed with high pressure sand control mechanism 2 respectively in central shaft upper end and middle and lower part, described high pressure sand control mechanism comprise dust ring 2-1, filter 2-2, and the bonding filter gland 2-4 of filter and be installed in filter and the filter gland between sand control filter screen 2-3, the sand control filter screen that adopts stainless steel to make is pressed in the filter by the filter gland.The urceolus upper end is connected with high-pressure oil pipe, and the lower end is fixed with urceolus gland 6 by screw thread, between high pressure dust-proof mechanism and bearing 3 high-pressure seal ring 7 is installed.Cutting head 8 is connected with the central shaft that extends the urceolus lower end by taper pipe thread, on the same horizontal plane of cutting head, be provided with four abradant jet nozzles and be packed in the cutting head by screw thread, wherein two abradant jet nozzle-axis and cutting head axial line intersect, in addition two abradant jet nozzle-axis are offset certain distance with the cutting head axial line, this distance is the arm of couple of jet reaction force, and the scope of this arm of couple is between 100-150mm.Described abradant jet nozzle wherein two be biasing abradant jet nozzle 10, two is straight abradant jet nozzle 9 in addition.
See also Fig. 7, the method for operating of hydraulic spinning type controllable abrasive material jet cutting apparatus:
According to the difference of employed abradant jet generation equipment, the ocean on-site cutting can be divided into dual mode: a kind of is to adopt oil field fracturing unit commonly used to produce abradant jet; The 2nd, adopt special abradant jet generating means to produce abradant jet.What on-site cutting of the present invention was used is the fracturing unit truck mode, is exactly not need once to drop into more fund because adopt fracturing unit truck as the benefit of the generating means maximum of abradant jet, in view of substantially all there is fracturing unit in present each oil field.Discarded oil well on-site cutting comprises following conventional auxiliary equipment: sand tank car 11, auger 12, fracturing blender truck 13, fracturing unit truck 14, measuring truck 15, high-pressure anti-wear sebific duct 16, wellhead hookup 17, well head centralizer 18, high-pressure oil pipe 19 and down-hole centralizer 20.
A. on cargo ship, successively hydraulic spinning type controllable abrasive material jet cutting apparatus 21, down-hole centralizer 20, high-pressure oil pipe 19, well head centralizer 18, wellhead hookup 17 and high-pressure anti-wear sebific duct 16 are connected, add encapsulant at the joint screw thread, the sealing material can adopt stop-leak compound, also can adopt polytetrafluoroethylraw raw material band, to prevent high pressure leaks;
B. above-mentioned hydraulic spinning type controllable abrasive material jet cutting apparatus 21, down-hole centralizer 20, high-pressure oil pipe 19, well head centralizer 18, wellhead hookup 17 and high-pressure anti-wear sebific duct 16 etc. are lowered in the well that needs cutting, and the top connection of high-pressure anti-wear sebific duct 16 is connected with fracturing unit truck 14;
C. adopt sebific duct that fracturing unit truck 14, fracturing blender truck 13 are connected by oil, and by cable measuring truck 15 and fracturing unit truck are connected the ninth of the ten Heavenly Stems;
D. start fracturing unit truck, earlier in high-pressure anti-wear sebific duct 16, high-pressure oil pipe 19 and hydraulic spinning type controllable abrasive material jet cutting apparatus 21, pump into clear water, be forced into the required operating pressure of the oil well casing that is cut, this pressure remains in 30~50Mpa scope, about 5 minutes of voltage stabilizing;
E. keep above-mentioned force value stable, in fracturing blender truck, add cutting sand by sand tank car, auger again, the preferred garnet of cutting sand, this be because the depth of cut when using pomegranate masonry abrasive material obviously greater than quartz sand, and garnet density and hardness is all higher, erosion ability to sleeve pipe is strong, and the garnet abrasive grain diameter is: 0.2~0.35mm.Through mixed concentration is that 17%~25% abrasive material slurry is transported in wellhead hookup, well head centralizer and the high-pressure oil pipe by the high-pressure anti-wear sebific duct;
F. urceolus 1 upper end with hydraulic spinning type controllable abrasive material jet cutting apparatus 21 connects high-pressure oil pipe, mixed high-pressure abrasive material slurry enters the urceolus of hydraulic spinning type controllable abrasive material jet cutting apparatus by high-pressure oil pipe, after filtering through high pressure sand control mechanism 2, liquid in wherein a part of high-pressure abrasive material slurry enters the annular space between central shaft 4 and the urceolus, to keep the dust ring 2-1 in the high pressure sand control mechanism to go up pressure balance, this partially liq is admission velocity controlling organization 5 inner chambers that can not continue to flow downward owing to high-pressure seal ring 7 effects of urceolus inside, all the other high-pressure abrasive material slurries flow into cutting head 8 by the inlet opening 4-1 of central shaft, the high-pressure abrasive material slurry that enters cutting head forms the high speed abradant jet through the abradant jet nozzle, the diameter of two biasing abradant jet nozzles 10 is: 2.4mm, the diameter of two straight abradant jet nozzles 9 is 3mm in addition.The effect that enters the reaction force that the abradant jet of two biasing abradant jet nozzles 10 forms this moment produces a rotation torque to cutting head, promote the rotation of cutting head and central shaft, by four abradant jet nozzles 9 on the cutting head and 10 abradant jets that penetrate oil well casing is circumferentially cut off along it, the rotary speed of described abradant jet nozzle is: 3rpm~30rpm, here preferred rotary speed is 6rpm, and described rotary speed is controlled by the size that is filled in the viscous force of tackifier between central shaft and the urceolus.Described tackifier are selected steam turbine oil for use, and its viscosity is at 2~100mm
2Between/the s.
G. when pressure was 30Mpa, control was about 10 minutes clipping time; When pressure is 50Mpa, control is about 8 minutes clipping time, when arriving the scheduled time, stop in fracturing blender truck, to add sand, and continue in hydraulic spinning type controllable abrasive material jet cutting apparatus, to pump into clear water about 15 minutes according to well depth, abrasive material slurry in the well is cleaned, replaces, close fracturing unit truck, finish the cutting of discarded well head.
Those of ordinary skill in the art can understand, and in protection scope of the present invention, the foregoing description is made amendment, and it all is possible adding and replacing, and it does not all exceed protection scope of the present invention.