CN2564729Y - Injection suction dual-purpose energy-saving oil pipe for producing heavy oil - Google Patents

Abstract

The utility model relates to an injecting suction dual-purpose energy-saving oil pipe for producing heavy oil, which is used for links of steam injection and oil sucking production when the heavy oil is produced. The utility model provides a new device with great energy saving exclusively used for the steam injection and the oil suction of an oil well. The energy saving rate of the steam injection is 5% and the energy saving rate of the oil suction is 75%. After the steam injection of a pipe is completed, the pipe is not pulled up again. After a pump is arranged in the pipe, the oil sucking production can be conducted and producing procedure is simplified. The concrete structure is displayed as an abstract figure 1 and comprises a connecting hoop (1), a bell-mouth reinforcing ring (2), an inner pipe (3), a vacuum hole (4), a heat insulating screen (5) of a third layer, a heat insulating screen (6) of a second layer, a support post (7), a heat insulating screen (8) of a first layer, a white body layer (9), an outer pipe (10), a resistance reducing hole (11) and a glass fiber rope (12).

Description

Thickened oil recovery is annotated and is taken out the double-purpose energy-saving oil pipe

Technical field

The used oil pumping oil pipe in down-hole when used insulated tubing in down-hole and viscous crude were pumped when the utility model related to the heavy oil wells steam injection can both be saved the new exclusive of the energy significantly and equip when it provides a kind of oil well steam injection and oil pumping.

Background technology

Thickened oil recovery in the past, internal diameter is the steam injection of 62mm insulated tubing under earlier in oil well, because internal diameter is little, can not be lowered to bull deep-well pump in this pipe directly pumps, therefore, annotated after the steam, trip out insulated tubing, being lowered to internal diameter again in well again is that 76mm oil pumping oil pipe, deep well pump and sucker rod begin oil pumping afterwards.Above-mentioned thickened oil recovery technology obviously can not be finished with a underground work, and carry out twice underground work and finish, and need of viscous oil recovery configuration one cover steam injection insulated tubing and another set of oil pumping oil pipe.Aluminium foil in the steam injection insulated tubing isolation layer and glass fabric closely twine between the two at present, because conduction and convection current are transmission of heat by contacts, closely contact of each layer can not weaken the conduction and the convection current of heat significantly in the structure.Isolation layer is when vacuumizing, and the eyelet internal memory in the glass fabric has air, and particularly the pressure in isolation layer is in the process that vacuumizes, and when reducing gradually, the air in the eyelet is difficult to extract out, and therefore, conduction and heat convection in the isolation layer are still very big.According to the above-mentioned state of the art, I once designed a kind of oil pipe in 2000, and promptly viscous crude is adopted the double-purpose energy-saving oil pipe with efficient the notes, and its patent No. is ZL00205014.5.By nearly 2 years field practice, find that there is certain defective in its structure design: the one, interior pipe and outer tube adopt connecting ring to be welded to connect, because interior pipe and size of outer tube differ bigger, outer tube diameter φ 114mm, interior external diameter of pipe φ 89mm, welding ring thickness reaches 12.5mm like this, because throat thickness is big, weld seam bears bigger pulling force, during 350 ℃ of down-hole steam injections, interior pipe welding seam breaking rate reaches 2%, and this fracture rate is unallowed on-the-spot use of thickened oil recovery.The 2nd, the interval of aluminium foil adopts support ring to realize in the layer, support ring will be connected with interior pipe spot welding, and welding rod will pass laminated aluminium foil and the welding of interior pipe during welding, whole welding process, the operator cannot see weld seam, and postwelding is dissected and found that 60% support ring is dry joint, and interior pipe causes the depression that reaches 3mm deeply, pipe is badly damaged in making, and causes interior defective tube.

Summary of the invention

The purpose of this utility model has provided the very little thickened oil recovery notes of a kind of apparent heat conductivity and has taken out the double-purpose energy-saving oil pipe, it is applicable to that oil well depth is less than 1500m, the environmental working condition that steam injection is 350 ℃, axial oil pipe tensile load is not less than 700kN in the time of 350 ℃, this utility model not only can be used for steam injection, has heat insulating function, and then the thermal loss in the pit shaft when reducing steam injection significantly, and after having annotated steam, do not trip out this pipe in the down-hole, this pipe has good heat insulation function again when pumping with it, make the oil liquid temperature in the pipe keep not reducing, flowing keeps continuing.

The technical scheme that its technical problem that solves the utility model adopts is: former viscous crude is adopted the double-purpose energy-saving oil pipe with efficient the notes, adopt the welding manner that is welded to connect ring in the structure design, weld with outer tube after pipe expands into horn mouth in changing into, since after interior pipe expands into horn mouth, its wall thickness reduction, and intensity decreases, put the horn mouth reinforcing ring in the reaming section before adopting reaming, earlier horn mouth reinforcing ring and reaming section are welded to connect, carry out reaming afterwards again, weld seam only bears less pulling force like this.Former viscous crude is adopted the double-purpose energy-saving oil pipe with efficient the notes, support ring in the structure design changes support column into, support column just welded 6 support columns at least on interior external diameter of pipe before the insulation layer assembling, axial distance equalization between the distance of each support column and interior pipe both ends of the surface and the support column, each support column is uniform welding on the circumference of interior external diameter of pipe.Each heat screen all has the drag reduction hole, and the effect in drag reduction hole is to make in the isolation layer, can be pumped into high vacuum quickly.The insulating layer structure design is adopted and is twined one deck aluminium foil on inner pipe earlier, is the lean type layer, and then spiral winding glass cord on the lean type layer according to the method described above, twines three layers of heat screen and one deck lean type layer altogether in isolation layer.

The beneficial effects of the utility model are: 1. with twice underground work of need of viscous oil recovery, change a underground work into, saved the operating cost of an insulated tubing and following oil pipe, after oil well has been annotated steam, transfer oil pumping immediately to and produce, rate increases during production, has certain effect of increasing production; 2. blowout and crude oil take place when thoroughly having solved insulated tubing to land and causes environmental pollution problems; 3. adopt the utility model oil pumping, the electric power heating is not implemented in initial stage down-hole oil pumping, the oil pumping middle and later periods is implemented the electric power heating, the electric power heating power has only 10-20kw, as pumping without this pipe, the electric power heating power that implement the down-hole reaches about 60kw, and then fractional energy savings is 75%, and the cost of production of thickened oil recovery reduces significantly; 4. adopt the utility model steam injection, because this pipe has the apparent heat conductivity less than 0.01w/m ℃, littler than former instlated tubular apparent heat conductivity, therefore, fractional energy savings reaches more than 5%.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is a sectional structure chart of the present utility model.

Among the figure: 1. box cupling, 2. horn mouth reinforcing ring, 3. in pipe, 4. vacuum hole, 5. the 3rd layer of heat screen, 6. second layer heat screen, 7. support column, 8. first floor heat screen, 9. lean type layer, 10. outer tube, 11. drag reduction holes, 12. glass cords.

The specific embodiment

Box cupling in Fig. 1 (1) adopts special-purpose petroleum casing pipe to link with outer tube (10) and connects.Interior pipe (3) adopts with outer tube (10) and is welded to connect, and is state of tension for making weld seam stressed, and the horn mouth tapering of inner tube portion can not be too big, and way is the length that suitably increases tapering.After isolation layer has been assembled, interior pipe (3) is packed in the outer tube (10), this Guan Yiduan is welded after intact, then interior pipe (3) is added the thermal stretching certain-length after, should manage the other end again and weld.The material of outer tube (10) and interior pipe (3) requires yield strength all greater than 650N/mm ², phosphorus content is less than 0.26%, and the metal true qualities are seen in pipe (3) external diameter, the rust cleaning of outer tube (10) internal diameter in requiring before the assembling.The material of heat screen (5), heat screen (6), heat screen (8) and lean type layer (9) adopts industrial aluminium foil, and industrial aluminium foil requires 250 ℃ of oven dry 4 hours before the assembling, makes the greasy dirt carbonization of aluminium foil surface, and then keeps the vacuum of isolation layer.For reducing this pipe cost of production, the thickness of lean type layer (9), can than other each heat screen thin thickness some.Assemble each heat screen by support column (7) before, earlier with the heat screen punching, the aperture is greater than support column (7) diameter with special tool, and support column (7) is positioned at aperture center when twining heat screen, and heat screen is not contacted with support column, reduces the focus area.Each heat screen all is provided with the drag reduction hole (11) of certain pore size, and the axis that requires each drag reduction hole (11) can reduce the air main force of flowing not at grade like this, can effectively protect each heat screen heat insulating function again.High-precision temperature control is adopted in the welding of stress end, and interior pipe is in welding under the temperature constant state during welding, and strictness is operated by the welding procedure system of material.

The inventor is accompanying drawing 1 structure to specifications, once made an embodiment, annotating the apparent heat conductivity test of taking out the double-purpose energy-saving oil pipe in thickened oil recovery is under the thermal steady state condition, when this pipe range 9.6m, interior pipe heating power is stablized 600w, and interior pipe temperature keeps 350 ℃, 28 ℃ of environment temperatures, under the above-mentioned parameter condition, 40 ℃ of outer tube temperature, this moment, the apparent heat conductivity J of this pipe was:

The heat-proof quality grade of petroleum industry SY/T5324-94 standard code instlated tubular is A, B, C, D, E totally 5 grades, the E level is a highest ranking, the apparent heat conductivity 0.0075w/m of this pipe ℃, entered the apparent heat conductivity scope and be 0.006-0.02w/m ℃ D grade.

Claims (4)

1. a thickened oil recovery is annotated and is taken out the double-purpose energy-saving oil pipe, by box cupling (1), horn mouth reinforcing ring (2), interior pipe (3), vacuum hole (4), the 3rd layer of heat screen (5), second layer heat screen (6), support column (7), first floor heat screen (8), lean type layer (9), outer tube (10), drag reduction hole (11), glass cord (12) constitutes, it is characterized in that interior pipe (3) upward twines one deck aluminium foil, be lean type layer (9), then go up spiral winding glass cord (12) at lean type layer (9), according to the method described above, in isolation layer, twine three layers of heat screen and one deck lean type layer altogether.

2. annotate according to the described thickened oil recovery of claim 1 and take out the double-purpose energy-saving oil pipe, it is characterized in that support column (7) just welded 6 support columns (7) at least before the insulation layer assembling on interior pipe (3) external diameter, axial distance equalization between the distance of each support column (7) and interior pipe (3) both ends of the surface and the support column (7), each support column (7) uniform welding on the circumference of interior pipe (3) external diameter.

3. annotate according to the described thickened oil recovery of claim 1 and take out the double-purpose energy-saving oil pipe, it is characterized in that first floor heat screen (8), second layer heat screen (6), the 3rd layer of heat screen (5), lean type layer (9) are equipped with drag reduction hole (11), the axis that requires each drag reduction hole (11) is not at grade.

4. annotate according to the described thickened oil recovery of claim 1 and take out the double-purpose energy-saving oil pipe, it is characterized in that welding with outer tube (10) after interior pipe (3) expands into horn mouth, reaming section at interior pipe (3) before the reaming puts horn mouth reinforcing ring (2), horn mouth reinforcing ring (2) and reaming section are welded to connect, carry out reaming afterwards again.

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