The manufacture method of supercritical heat-insulated oil pipe
Technical field:
The present invention relates to the manufacture method of the oil pipe manufacture field of heavy oil wells exploitation via steam injection process employing, particularly a kind of manufacture method of supercritical heat-insulated oil pipe.
Background technology:
Insulated tubing is the important equipment that heavy oil wells exploitation via steam injection process adopts; its purposes is to inject high temperature, high steam toward the down-hole as annotating the vapour passage; and protect oil well casing and cementing concrete ring to avoid thermal stress damage, and reduce the pit shaft thermodynamic loss, improve and annotate vapour oil recovery effect.Chinese patent (application number 97115719.7) discloses a kind of " vacuum heat-insulation oil pipe and manufacturing process technology thereof ", is made up of box cupling, insulation bushing, bushing pipe, outer tube, interior pipe, heat-barrier material, wiper block, getter.The vacuum heat-insulation oil pipe manufacturing process technology that this invention provides is as follows: 1. pipe processing is handled in, and interior pipe adopts external upset tubing, and toroidal is expanded into horizontal forging and upsetting machine after adopting heating in medium frequency in two ends, and the horn mouth size is identical with outer tube diameter; Inner tube outer surface is carried out Shot Blasting; Industrial aluminium foil with tape punching wraps in interior tube outside, and dispenser getter on it wraps the 2-15 layer altogether, and every two-layer middle with glass fiber screen window cloth that toasted or glass fabric interval, the formation heat-barrier material has wrapped the back along 4 pairs of wiper blocks of interior pipe total length uniform device; The interior pipe assembly of wrapping heat-barrier material sent in the stove toast; 2. inner and outer pipe assembling is packed the interior pipe assembly after the baking into inner surface in the outer tube of bead; Use CO
2Electrogas process welding ring weld seam welds inner and outer pipes one end earlier; Apply prestressing force for interior pipe with the thermal stretching method then; Use when pipe is elongated to designing requirement in treating with the quadrat method weldering other end; 3. vacuumize, after the evacuation holes of aiming at outer tube one end is loaded onto special finding time for the insulated tubing that is assembled into one to seal jig, begin to vacuumize; Vacuumizing simultaneously, on custom-designed roasting plant, insulated tubing is toasted, to find time while toasting, baking temperature is on operating temperature; 4. shutoff welding, when vacuum reach design standard (<15Pa) after, adopt electric resistance welding method under the situation of finding time, evacuation holes to be carried out the shutoff welding; 5. installation accessories is with connecting thread on the outer tube upper/lower terminal car; Then, load onto the box cupling of band sealing ring by screw thread, should be on screw thread before the dress brushing stop-leak compound; The bushing pipe that the outside is set with insulation bushing places interior pipe top.The needs of the vacuum heat-insulation oil pipe operate as normal that heat-insulating technique that this invention adopts laminated aluminium foil to vacuumize guaranteed 9m only several millimeters to tens millimeters in monolateral gap how long and between inside and outside two pipes, work under HTHP.Adopt the method for heating in medium frequency adapted horizontal forging and upsetting machine, solved the difficult problem of pipe termination bell mouth expanding how long at 9m.Adopt the internal pipe of thermal stretching method to apply the temperature difference elongation that prestressing force can compensate inner and outer pipes.Make in the process, material therefor all toasts dry the processing, and bead is all carried out in the metal surface, and puts into getter in annular space, can make the vacuum heat-insulation system remain intact state, avoids all gases and pollutes.Insulated tubing two ends girth joint adopts CO
2Gas shielded arc welding, but both guaranteed strengths can guarantee sealing again.When the shutoff evacuation holes, adopt the electric resistance welding plugging technology, and use special-purpose sealing jig, thereby can when vacuumizing, weld plug-hole, thereby can guarantee to seal the vacuum of annular space.
The problem that this technology exists comprises: the grade of steel that (1) tubing adopts is N80, made things convenient for processing, but prestressing force reduces but; (2) used welding wire is CO in the insulated tubing welding process
2The melting solid core welding wire; (3) highly purified carbon dioxide gas is used in the insulated tubing welding; (4) the anti-inner pressure test pressure of insulated tubing normal temperature is 32MPa, the anti-outer test pressure 26MPa that squeezes of normal temperature; (5) the insulated tubing apparent heat conductivity is that coefficient of thermal conductivity is≤0.02W/m ℃; (6) this technology pipe fitting processed can only satisfy the steam in jection temperature and is no more than 350 ℃, and steam in jection pressure is no more than 21MPa, and well depth is no more than 1600 meters hole condition.
Summary of the invention:
Purpose of the present invention is exactly the problems referred to above that exist at the insulated tubing that prior art is processed, a kind of manufacture method of supercritical heat-insulated oil pipe is proposed, improve and tackle key problems from selection and process conditions,, satisfy the requirement of using under more kinds of conditions to improve the performance indications of insulated tubing.
Its technical scheme is:
(1) preliminary treatment of outer tube comprises: the heat resisting steel of P110 grade of steel is used in the selection of material, by the preparation size lower outer pipe material of interior pipe, beat aspirating hole, with rust remover outer tube wall is carried out processing of rust removing, together advance the bake out stove with interior pipe, be heated to more than 380 ℃ and be incubated processing;
(2) preliminary treatment of interior pipe comprises: the heat resisting steel of P110 grade of steel is used in the selection of material, pipe material in pressing under the preparation size of outer tube, on bloated rammer machine, use heating in medium frequency, interior pipe two ends is expanded into the horn mouth shape, with the outer wall rust remover outer wall of inner tube is carried out processing of rust removing, press that pipe horn mouth end face and outer tube together advance the bake out stove in the matching request car, be heated to more than 380 ℃ and be incubated processing; Be cooled to uniform temperature after coming out of the stove,, and place getter at outer wall of inner tube parcel heat-barrier material;
(3) suit: the interior pipe box after the wrapping is gone into outer tube, and reserve weld size on request;
(4) welding I end: inner and outer pipes is carried out the welding of I end.Used welding wire is a flux-cored wire, and welding used protective gas is highly purified argon gas and carbon dioxide gas mixture, is incubated processing after the welding;
(5) autofrettage: internally pipe heating carrying out autofrettage;
(6) weldering II end: use end with quadrat method welding inner and outer pipes II;
(7) x ray line flaw detection: to pipe two ends girth joint carrying out flaw detection;
(8) heating vacuumizes: internally pipe heats and is evacuated to 10
-2The Pa order of magnitude;
(9) the stifled weldering of vacuum: stifled weldering under vacuum state, and strengthen repair welding;
(10) magnetic powder inspection: the plug-hole weld seam is carried out carrying out flaw detection;
(11) measure and the control coefficient of thermal conductivity is 0.01W/m ℃~0.04W/m ℃;
(12) TBE;
(13) dress sealing ring is coated with stop-leak compound: adorn sealing ring and be coated with elevated-temperature seal fat to box cupling;
(14) go up box cupling: beat the tight mark of jib, and the tight moment of torsion of machine in accordance with regulations and position machine are right after hoop;
(15) latus rectum: use the standard jack rabbit that the instlated tubular endoporus is carried out the latus rectum inspection;
(16) integrated testability: do respectively press in anti-, anti-ly squeeze outward, whole tensile load and glacing flatness detect, the anti-inner pressure test pressure of normal temperature is more than 40MPa, the anti-outer test pressure that squeezes of normal temperature is more than 45MPa;
(17) go up the screw thread protection device.
Adopt the inner and outer pipe of the supercritical heat-insulated oil pipe main body tubing string of technique scheme processing to adopt double wall formula enclosed type welded construction.During welding, interior pipe has carried out autofrettage, has dosed multiple heat insulation structural between the inner and outer pipe interlayer, has placed the agent of suction hydrogen, has taken out vacuum, and has carried out the special warfare processing, the energy loss in the time of effectively reducing heat conduction, convection current and radiation; And prevent that insulated tubing " hydrogen is quick-fried " from taking place.During work, pipe passes through high temperature and high pressure steam in the insulated tubing, because box cupling has adopted the screw thread in the standards such as API, and dosed teflin ring, be provided with heat insulation bushing pipe between tubing string, when the insulated tubing operate as normal, can guarantee the positiver sealing of tubing string, firmly connect, can guarantee the laminar condition of delivering vapor again, reduce the thermal loss at steam transporting resistance and box cupling place.The characteristics of supercritical heat-insulated oil pipe: the structure of supercritical heat-insulated oil pipe is identical with the prestressing force insulated tubing, the convenient use; Supercritical heat-insulated oil pipe can satisfy steam injection pressure 26MPa, 400 ℃ of steam injecting temperatures, and by process combination, following well depth can reach the operating mode of 2300m; Coefficient of thermal conductivity is 0.01W/m ℃~0.04W/m ℃; The anti-inner pressure test pressure of normal temperature is more than 40MPa, and the anti-outer test pressure that squeezes of normal temperature is more than 45MPa, and the oil well that can satisfy under more different well ' s conditions conditions uses, and is the substitute products of existing insulated tubing.
The specific embodiment:
Be example with 9 meters standard insulated tubings below, specify its processing method:
1 outer tube preliminary treatment:
(1) retest of materials: press the chemical composition that outer tube pipe workpiece quality certificate and API SPEC 5CT review tubing normal temperature mechanical performance and tubing;
(2) blanking: by the preparation size lower outer pipe of interior pipe;
(3) play steel impression mark: chase after north steel impression mark at outer wall of steel pipe assigned address rolling stock, product;
(4) beat aspirating hole
(5) inwall rust cleaning: outer tube wall is carried out processing of rust removing with rust remover;
(6) bake out: and interior pipe together advances the bake out stove, is heated to more than 380 ℃ and is incubated processing;
Pipe preliminary treatment in 2:
(1) retest of materials: the chemical composition of reviewing tubing normal temperature mechanical performance and tubing by interior pipe pipe workpiece quality certificate and API SPEC 5CT;
(2) carry out the inspection of interior pipe latus rectum by API SPEC 5CT;
(3) blanking: pipe in pressing under the preparation size of outer tube;
(4) the bloated rammer: on bloated rammer machine, use heating in medium frequency, interior pipe two ends is expanded into the horn mouth shape;
(5) outer wall rust cleaning: outer wall of inner tube is carried out processing of rust removing with the outer wall rust remover;
(6) play steel impression mark: at outer wall of steel pipe assigned address rolling stock, chase after north steel impression mark;
(7) planar end surface: press pipe horn mouth end face in the matching request car;
(8) bake out: and outer tube together advances the bake out stove, is heated to more than 380 ℃ and is incubated processing;
(9) wrapping: the back cooling of coming out of the stove at outer wall of inner tube wrapped multiple heat-barrier material on request, and adds getter;
3 suits: the interior pipe box after the wrapping is gone into outer tube, and reserve weld size on request;
4 weldering I ends: behind the weldering of the welding procedure after evaluation I end, lag insulation is in time handled;
5 autofrettages: internal pipe adds thermal stretching and carries out autofrettage;
6 weldering II ends: weld the II end by weldering I end mode;
7x ray line flaw detection:, and press the GB3323 evaluation to pipe two ends girth joint carrying out flaw detection;
8 heating vacuumize: internally the tube edge heating edge vacuumizes, and is evacuated to 10
-2The Pa order of magnitude;
The stifled weldering of 9 vacuum: stifled weldering under vacuum state, and strengthen repair welding;
10 magnetic powder inspections: the plug-hole weld seam is carried out carrying out flaw detection;
11 survey apparent heat conductivity: survey apparent heat conductivity with instrumentation;
12 machining screw: carry out processing of BCSG screw thread and check by API SPEC 5B standard;
13 dress sealing rings are coated with stop-leak compound: adorn sealing ring and be coated with the special-purpose high temperature stop-leak compound to box cupling;
Box cupling on 14: beat the tight mark of jib by API SPEC 5CT standard-required, and the tight moment of torsion of machine in accordance with regulations and position machine are right after hoop;
15 latus rectums: use the standard jack rabbit that body is carried out 100% total length latus rectum inspection;
16 integrated testabilities: by standard-required production tube is inspected by random samples, do respectively press in anti-, anti-ly squeeze outward, whole tensile load and glacing flatness detect;
Screw thread protection device on 17: the internal and external screw thread protector of screwing on request;
18 moppings spray mark: on request to the tube surface mopping and the seal mark that sprays paint;
19 packings: packing in accordance with regulations.
Specify: the used tubing of supercritical heat-insulated oil pipe (comprising outer tube, interior pipe, bushing pipe) is the heat resisting steel of P110 grade of steel; The used welding wire of supercritical heat-insulated oil pipe is a flux-cored wire; It is highly purified argon gas and carbon dioxide gas mixture that supercritical heat-insulated oil pipe welds used protective gas; The anti-inner pressure test pressure of supercritical heat-insulated oil pipe normal temperature is 40MPa, the anti-outer test pressure 45MPa that squeezes of normal temperature; The supercritical heat-insulated oil pipe apparent heat conductivity is 0.01W/m ℃~0.04W/m ℃.