CN1213737A - Cycling heating tech. of oil well casing dual-pipe parallel heat transport fluid - Google Patents

Abstract

A circulating and heating technique with heat medium and sleeved parallel pipes for the well of oil, especially the thick or high-viscosity oil features that two parallel circulating and heating pipes for heat medium are arranged in the sleeve pipe of oil well and parallel with the oil-pumping pipe. Their top ends are connected via special 4-way to the heating and circulating system on the ground and their lower ends are communicated via a radiation-type return unit. Its advantages are high flow of heat medium, high heating effect, saving electricity and energy and simple technology.

Description

Oil well casing dual-pipe parallel thermophore heating tech

The present invention relates to a kind of oil particularly viscous crude, high oil well casing dual-pipe parallel thermophore heating tech that coagulates the extraordinary oil exploitation of wet goods of being used for.

At present, on-the-spot oil particularly viscous crude, high coagulating in the extraordinary oily recovery process of wet goods, for reducing viscosity of crude, improving the crude oil flow performance and adopting multiple heating technique, comprising electrical heating, steam injection, heat transfer medium circulation heating etc.Preceding two kinds of thermal recovery technical matters complexity, it is huge to consume energy, and needs a large amount of pipelines of configuration, equipment, thereby cost of production is higher.In a kind of heat transfer medium heating tech in back, adopting more at present is to utilize hollow rod as passage, adopts thermophores such as conduction oil, water that OIH stream is heated.Because this kind hollow pipe-type structure need be installed tubule in hollow rod when constituting circulation canal, thereby size is restricted, and operating pressure is too high, and the thermophore internal circulating load is little, can not adapt to the actual needs of oil well heating, influences the oil mining effect.

The object of the present invention is to provide that a kind of technology is simple, cost is lower, can improve the oil well casing dual-pipe parallel thermophore heating tech of oil well heating and exploitation effect greatly.

The present invention realizes like this.The core of oil well casing dual-pipe parallel heat transfer medium heating tech provided by the invention is in oil well casing, the pumping pipe string that is lowered to off-centre is lowered to two parallel thermophore circulation heating tubing strings (being called for short two-tube) side by side, two-tube upper end is drawn and is connected with the ground heating circulation system from special-purpose well head four-way one side, the lower end is then installed and is connected one and make the heat dissipation type of the two-tube connection device of turning back, above-mentioned ground heating circulation system, two-tube loop heating system three parts in wellhead assembly and down-hole are combined into one, and constitute the oil well thermophore loop heating system of whole sealing.Under this working state of system, the thermophore (liquid such as conduction oil or water) that is come by the ground heating circulation system continuously enters in the oil well by feed tube through the well head four-way, return on heat dissipation type is turned back device in the feed tube bottom, on liquid back pipe, turn back to ground again.So move in circles, thermophore is brought heat in the well into continuously, and with the heat conduction rail that distributes, the extraction crude oil in the oil pipe is heated, and finally reaches the purpose that improves oil stream temperature, viscosity reduction drag reduction and guarantee the oil well ordinary production.

The invention provides a kind of new thermophore heating tech and device, compared with prior art, this kind thermophore down-hole circulation heat tunnel caliber is big, and the pressure loss is little, and the thermophore circular flow is big, and the heat of bringing in the well is big, thereby heats effective.Advantages such as that the present invention also has is energy-conservation, economize on electricity and technology are simple, easy to implement adopt this technology can improve viscous crude, high-solidifiability oil well heating, exploitation effect effectively, are suitable for and apply.

Fig. 1 is dual-pipe parallel thermophore heating tech principle and an equipments overall structure schematic diagram thereof in the oil well casing provided by the invention.Among the figure, mark is respectively oil pumper, sucker rod and production tree with " 1 ", " 2 ", " 3 ", and label " 10 " is an oil reservoir.

Fig. 2, Fig. 3 are wellhead assembly structural representation and A-A sectional view thereof.

Fig. 4 is a pipeline distribution sectional drawing in the well.

Fig. 5 is ground loop heating system operating principle and schematic flow sheet.

Below in conjunction with accompanying drawing enforcement of the present invention is illustrated.

As shown in Figure 1, ground of the present invention, well head, downhole hardware and flow process are made up of ground heating circulation system 14, thermophore feed tube 13, liquid back pipe 12, the device 11 of turning back, special-purpose well head 4, special-purpose four-way 5, oil pipe 6, sleeve pipe 7, oil well pump 8, tail pipe 9.Feed tube 13, liquid back pipe 12 upper ends are connected with return duct with the thermophore efferent duct of ground heating circulation system 14 respectively through the special-purpose four-way of well head, and the lower end is connected with device 11 import and exports of turning back respectively; Advance, return liquid two-tube 13,12 and be lowered to side by side in the sleeve pipe 7, oil pipe and oil well pump 8 down thereof and tail pipe 9 are lowered to (see figure 4)s in the sleeve pipe 7 side by side prejudicially with advancing, return liquid two-tube 13,12, and the upper end is connected and fixed by special-purpose four-way 5 backs and special-purpose well head 4.In the downhole hardware, thermophore advances, liquid back pipe 13,12 can adopt according to the oil well casing size ³/ 4 " 1 ¹/ 2 " (being diameter 20-38mm) steel pipe; The device 11 of turning back is the pipe that an external surface is provided with fin, and its upper surface is provided with two circular holes, be used for respectively with advance, liquid back pipe assembling matches; Oil pipe 6, sleeve pipe 7, oil well pump 8 and tail pipe 9 are general part.As Fig. 2, shown in Figure 3, special-purpose well head 4 is made up of well head fairlead 15, hole cover 16, four-way lid 20, bolt and nut 19, sealing ring 18, tubing hanger 17, and special-purpose four-way 5 is made up of four-way body 22, heating leading-out end 24, heating tube top connection 25; Four-way lid 20 and hole cover 16 are equipped with in four-way body 22 tops seat successively, are provided with joint ring 21 between four-way lid 20 and the four-way body 22, and the three is connected and fixed with the 12 cover bolt and nuts 19 that penetrate in 12 eyelets that are uniformly distributed along the circumference; Device has tubing hanger 17 in the four-way lid 20, and with sealing ring 18 sealings, is provided with well head fairlead 15 in the hole cover 16; Sides are adjacent in the four-way body 22 is provided with 2 heating tube top connections 25, by being threaded in order to the heating leading-out end 24 that links to each other with return duct with ground loop heating system efferent duct, the heating tube top connection at four-way body 22, heating tube top connection 25 and heating leading-out end 24 three's contact gap positions is provided with airtight and watertight padding 23 outward respectively in two heating tube top connections, 25 outer ends.Wherein, 22 times end flanges of four-way body are the same with common flange, the upper flanges diameter is greater than following end flanges, constitute eccentric structure, o-ring groove also is an eccentric structure, middle part one side is provided with two adjacent heating tube fairleads, correspondingly on the inner headed face of below is provided with 2 and sets the load-bearing step, puts heating tube top connection 25 and bears heating tube weight in order to seat.Heating tube top connection 25 is the threeway that shut a upper end, and the one side is a pin thread, is used for and heats leading-out end 24 and link to each other, and lower end band negative thread, and 90 ° of ring-shaped steps are arranged is used for being connected and seat is placed on the load-bearing step of four-way body with two-tube.As shown in Figure 5, ground loop heating system 14 by two independently the loop constitute.The top heating circuit follows pipeline 26,27, boiler 30, circulation pump 31, strainer 32, valve 33, fuel reserve tank 34, down-hole circulation thermophore heater 42 by ground heating and constitutes.Wherein, be conduction oil in the oil storing tube 34, open valve 33, start circulation pump 31 and boiler 30 work, conduction oil just circulates and heats, and the conduction oil that enters and be stored in the heater 42 can heat the thermophore in the closed circuit of bottom.The bottom closed circuit is made of thermophore efferent duct 40, return duct 41, heater 42, electromagnetic valve 43,44, flow transmitter 45,46, constant pressure valve 35, circulation pump 36, strainer 37, valve 38 and liquid reserve tank 39 and control cables 28, automatic control box 29.Wherein, in the liquid reserve tank 39 is water or conduction oil, during work, electromagnetic valve 43,44 is opened, circulation pump 36 work, thermophore is successively after valve 38, strainer 37, circulation pump 36, flow transmitter 46, electromagnetic valve 44, heater 42, thermophore efferent duct 40 enter oil well and return out, through return duct 41, electromagnetic valve 43, flow transmitter 45, enter liquid reserve tank 39, so go round and begin again, circulation is more than, realizes the purpose to extraction heating crude oil in the well.

Claims (3)

1, a kind of oil well casing dual-pipe parallel thermophore heating tech, it is characterized in that: this technology is that the pumping pipe string that is lowered to off-centre in oil well casing is lowered to two parallel thermophore circulation heating tubing strings side by side, two-tube upper end is drawn and is connected with the ground heating circulation system from special-purpose well head four-way one side, and the lower end is equipped with the heat dissipation type that the makes two-tube connection device of turning back; The apparatus that this technology adopts is by ground heating circulation system (14), thermophore feed tube (13), liquid back pipe (12), the device (11) of turning back, special-purpose well head (4), special-purpose four-way (5), oil pipe (6), sleeve pipe (7), oil well pump (8) and tail pipe (9) are formed, feed tube (13), liquid back pipe (12) upper end is connected with ground heating circulation system (14) respectively through the special-purpose four-way of well head (5), the lower end is connected with the device of turning back (11) respectively, advance, liquid back pipe (13), (12) be lowered to side by side in the sleeve pipe (7), oil pipe (6) and under oil well pump (8) and tail pipe (9) be lowered to prejudicially in the sleeve pipe (7), the upper end is connected and fixed by special-purpose four-way (5) back and special-purpose well head (4).

2, oil well casing dual-pipe parallel thermophore heating tech according to claim 1, it is characterized in that, special-purpose well head (4) is made up of well head fairlead (15), hole cover (16), tubing hanger (17), sealing ring (18), bolt and nut (19), four-way lid (20), and special-purpose four-way (5) is made up of four-way body (22), heating leading-out end (24), heating tube top connection (25); Four-way lid (20) and hole cover (16) are equipped with in four-way body (22) top seat successively, and the three is connected and fixed with the bolt and nut (19) that penetrates in 12 eyelets that are uniformly distributed along the circumference, and is provided with joint ring (21) between four-way lid (20) and the four-way body (22); Device has tubing hanger (17) in the four-way lid (20), and with sealing ring (18) sealing, is provided with import fairlead (15) in the hole cover (16); A side is adjacent in the four-way body (22) is provided with 2 heating tube top connections (25), two heating tube top connection (25) outer ends are respectively by the heating leading-out end (24) that has been threaded, and the heating tube top connection at four-way body (22), heating tube top connection (25) and heating leading-out end (24) three's contact gap position is provided with airtight and watertight padding (23) outward.

3, oil well casing dual-pipe parallel thermophore heating tech according to claim 2, it is characterized in that, four-way body (22) upper flanges diameter is greater than following end flanges, constitute eccentric structure, seal groove on it also is an eccentric structure, middle part one side is provided with two adjacent heating tube fairleads, correspondingly on the inner headed face of below is provided with 2 load-bearing steps.

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