CN2340893Y

CN2340893Y - Underground electromagnetic heater and hole top and borehole therefor

Info

Publication number: CN2340893Y
Application number: CN 98214914
Authority: CN
Inventors: 曹云森
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-05-29
Filing date: 1998-05-29
Publication date: 1999-09-29
Anticipated expiration: 2008-05-29

Abstract

The utility model relates to an underground electromagnetic heater and the hole top and the borehole thereof. The heater can be lifted without off production, and can be used for a plurality of wells. Two electromagnetic heaters are hung into the upper and the lower ends of an underground annular heating sections from two holes on an off-center tubing hanger, the upper part of the longer column of each heater is hinged with a 'V'-shaped supporting bar 20, and the lower part is hinged with an arc-shaped frame 24 with four rods; the positions with the maximum diameter are both provided with pulleys, and the pulleys which are slid down along a downhole oil pipe can be positioned at heating points, so that the heaters can be lifted conveniently. A convex electrical contact 22 in each heater, which is exposed out of the heater under the action of a supporting spring 28, can be tightly contacted with a heating oil pipe, and an energized loop which is composed of the upper and the lower heaters and the heating oil pipe can be used for heating. Equipment on a hole top and a borehole is additionally provided with an insulating layer, so that the heating can be safe.

Description

Can play following formula downhole electromagnetic heater and supporting well head well bore

The utility model relates to field produces well heater, belongs to play following formula downhole electromagnetic heater and supporting well head well bore.

The crude oil denseness of coming out from oil well production in the oil field that has is big, and is mobile poor; Simultaneously contain wax in the crude oil, tie the flow process from oil pipe on tube wall, more knot is thicker, to fuel-displaced and underground work is all unfavorable later on, often the down-hole is heated and slows down wax deposition, viscosity reduction and pour point depression.At present, comparatively advanced is electrical heating, is that heater is fixed on the oil pipe that needs bringing-up section, is lowered in company with oil pipe; Trip out in company with oil pipe in the time of need tripping out, in the process of removing, will stop production; Also will trip out the down-hole heater during underground work, nonproductive time is longer, influences oil well production.Oil well heat time heating time is to decide according to the down-hole concrete condition, can be interrupted heating, and the down-hole heater has lay-up period like this, trips out and bothersome, also will stop production, and can not use in turn at several mouthfuls of wells by a cover heater, has waste.

The purpose of this utility model is to avoid the problem that exists in the above-mentioned present technology, and a kind of safe and reliable risen following formula downhole electromagnetic heater and supporting well head well bore are provided, and does not stop production when removing, and can trip out when idle and be used in other down-hole.

The purpose of this utility model can reach by the following technical programs: hang up at the well head eccentric oil pipe and be drilled with two through holes, have on the bringing-up section upper and lower end of down-hole from these two through holes to hang in identical upper and lower electromagnetic heater with two cables in down-hole; The profile of electromagnetic heater is long cylinder, and its inner embedding cable cap in upper end, lower end connect weighted lever.Can form the support bar of " eight " font after hinged the opening with bearing pin on the top of this cylinder, the bar end is equipped with pulley, and " V " shape flexure strip is housed between each pole-footing portion and the cylinder; The arched frame that the bottom has four bars to constitute, the two ends of arched frame are hinged on the cylinder.Stud with the convex contact that formation electrically contacts with oil pipe with column body between above-mentioned support bar and arched frame, contact exposes cylinder with groups of springs; Between the wall of the formed chamber of contact, groups of springs and column body insulation sleeve is arranged; Hang the cable that hangs in from eccentric oil pipe and be connected with contact with the inside center hole, form the circuit heating by oil pipe and upper and lower heater upper contact head through the cable cap on the electromagnetic heater.

Lower end two bars of above-mentioned arched frame can close up after penetrating in the cylinder both sides are oblique, be in column body and form centre bore plunger is housed closing up, it is hinged with bearing pin that this plunger passes back, the place of closing up, arched frame lower end, and support spring also is housed in this plunger hole, makes arched frame can have micro-displacement to change in the axial direction.On the cylinder face on convex contact opposite the arch spring leaf is housed, this sheet one end is fixed, the oblique column body centre bore that penetrates of the other end, and this centre bore dress plunger and support spring, this plunger and arch flexure strip are hinged simultaneously.Insulation sleeve is equipped with in the contact position between polished rod eye and polished rod on the well head, the hair plait, and insulator cap is also adorned at the top of polished rod; Adorn insulation sleeve between pipeline on the pipe jointer and the clip, and adorn dead ring between the pipeline connection, dress insulation sleeve in cooperation place between tubing hanger and the big four.Set upright circle in the well bore on the oil pipe and set upright circle with insulation, down-hole oil tube lower end antiwind unit is divided into two bodies, is connected as a single entity with bolt behind the dress felt pad between two bodies, also adorns insulation sleeve on the bolt.By such scheme as can be known, lean on groups of springs and arch flexure strip and down-hole heating oil pipe upper and lower end to form with the convex contact and electrically contact, constitute power-on circuit, energising is heated to this section oil pipe; Establishing the arched frame that " eight " font support bar and four bars constitute on the heater can be up and down along well bore middle sleeve freedom, plays the role of positioning again after being lowered to hot spot; May produce electric leakage place on the well head in equipment and the well bore on the oil pipe insulating layer all is housed, can realize this purpose by above-mentioned design.

The utility model is compared with above-mentioned prior art can have following advantage: adopt decentralized wellhead equipment at the field produces well, hang two ports of brill on the eccentric side at eccentric oil pipe, this electromagnetic heater is long cylindrical body, " V " shape and arch support frame on the cylindrical body, scalable hanging up from eccentric oil pipe smoothly under two ports usefulness downhole cable lower going-into-wells desired on the heated well section making progress in week, on the lower end, by " V " shape on it and arch support frame location, on the heater with the contacted electrical contact of oil pipe, on the cylinder face of opposite, adorn one " V " shape flexure strip again, can guarantee that electrical contact and oil pipe energising back formation electrically contacts.After down-hole heated well section heating finishes, can trip out and be lowered to other well,, remove freely, need not stop production and to remove, make the shared a set of equipment of many wells, improve the heater utilization rate, reduce the individual well heating cost because of pulley all is housed on the positioning supporting frame of heater.This heater is the comparatively advanced heater of down-hole target zone heating, control and remove of well paraffin, releasing oil well wax card, paraffin blockage and wax-proof viscosity reducing.Adopt this heater, to the down-hole well bore, all added insulating layer (cover) producing the electric leakage part from well head, thus safe and reliable.

Accompanying drawing 1 is an equipment schematic diagram on decentralized wellhead and the down-hole well bore;

Accompanying drawing 2 is electromagnetic heater 11 ground installation schematic diagrames matching used with it on Fig. 1;

Accompanying drawing 3 is electromagnetic heater 11 structure charts on Fig. 1;

Accompanying drawing 4 is structural member views that electrical contact 22 is mated on Fig. 3;

Accompanying drawing 5 is polished rod eye 1 partial sectional views on Fig. 1;

Accompanying drawing 6 is connector 3 partial sectional views on Fig. 1;

Accompanying drawing the 7, the 8th, eccentric oil pipe is hung 6 and is contained in main, left view on the big four 7 on Fig. 1;

Accompanying drawing 9 is to set upright coil structures figure on Fig. 1 on the oil pipe 8;

Accompanying drawing the 10, the 11st, antiwind unit 12 main, left views on Fig. 1.

Below in conjunction with accompanying drawing will the utility model is described in further detail:

Shown in figure, have in the wellhead equipment that big four 7, eccentric oil pipe hang 6, lubricator and test strobe 5, lower going-into-well cable 4, pipe jointer 3, polished rod 2 and a polished rod eye 1 down, have in the well bore of down-hole oil pipe 8 and on set upright enclose 9, box cupling 10 and antiwind unit 12.By shown in Figure 2, transformer 14 and input power supply 13, power distribution cabinet 15 and supervising device 16 are arranged in the corollary equipment of ground, also have double-drum winch 17.

In conjunction with shown in Figure 7, the utility model is to hang 6 eccentric side at eccentric oil pipe to be drilled with two axially extending bores 39 by accompanying drawing 1, and the down-hole is desired to have on the bringing-up section upper and lower end and hung two downhole cables 4 of two through hole 39 usefulness from eccentric oil pipe and hang in identical electromagnetic heater.The profile of this electromagnetic heater is long cylinder 11, and its upper end is embedded in cable cap 18, the lower end connects weighted lever 25, and wherein cable cap 18 is existing accessory commonly used for connecting the cable of going into the well; Weighted lever 25 has draw.Support bar 20, two bars 20 ends that can form " eight " font on the top of this cylinder 11 with bearing pin after hinged the opening are respectively adorned pulley, and " V " shape flexure strip 19 is housed between each bar 20 root and the cylinder, make support bar form " eight " font; There is an arched frame 24 bottom with what four bars constituted, and the two ends of arched frame 24 are hinged on the cylinder 11 with bearing pin, and wherein two bars are outwards heaved the junction and are connected with pulley.Stud with the convex contact 22 that 8 formation electrically contact with oil pipe in cylinder 11 inside between support bar 20 and arched frame 24, can form inner chamber for 11 li at cylinder, contact 22 embeds inner chambers, exposes cylinder 11 with groups of springs 28 supports contacts 22; Simultaneously, felt pad (23,30) is arranged between contact 22, groups of springs 28 and cylinder 11 internal chamber walls.Cable 4 stretches into cylinder 11 centre bores and is connected with inside contact 22 through cable cap 18, electrically contacts because of contact 22 forms with down-hole oil tube, makes electric conductor with oil pipe, the heating of can switching on of upper and lower heater forming circuit loop.

Lower end two bars of above-mentioned arched frame 24 can close up after the oblique insertion in cylinder 11 both sides, be in the inner axial holes that form of cylinder 11 plunger 45 and support spring 46 are housed closing up, this plunger passes the arched frame lower end and closes up the place, in the axial direction telescopic displacement can be arranged after arched frame 24 distortion.On the opposite cylinder face that contact 22 exposes, an arch flexure strip 29 is housed in addition, sheet 29 1 ends are fixed on the cylinder, the oblique column body centre bore that stretches into of the other end, dress plunger 26 and spring 47 in the hole, flexure strip 29 other ends are hinged on the plunger 26, flexure strip has axial displacement in deformation process, and guarantees that contact 22 tightly contacts with oil pipe.As shown in Figure 5, cooperates the contact position that insulation sleeve (32,33) is housed between polished rod eye 1 and polished rod 2, the hair plait 34, insulator cap 31 is adorned at polished rod 2 tops.As shown in Figure 6, the place of being connected and pipeline all are equipped with insulation sleeve or dead ring (37,38) between being connected between the pipeline 35 on the pipe jointer 3 and the clip 36.By shown in Figure 7, dress insulation sleeve 40 in cooperation place between tubing hanger 6 and the big four 7.By shown in Figure 9, adopt insulation to set upright circle 9 on the down-hole oil tube 8, set upright the external diameter of the external diameter of circle 9 greater than tubing coupling 10.By shown in Figure 10, down-hole oil tube 8 lower end antiwind units 12 are divided into two bodies (41,43), and dress felt pad 42 backs are connected as a single entity with bolt 44 between two bodies (41,43), also adorn insulation sleeve 48 on the bolt 44.By Fig. 5～Figure 10, all be some insulating layers that increase for safety in the supporting well head well bore equipment of this heater.By shown in Figure 3, stretch into cylinder 11 centre bores through cable cap 18, cover rubber sleeve 21 on the lead of drawing by cable cap.By shown in Figure 4, the inner chamber that contact 22 is installed on cylinder 11 has side mouth gland 27.

Claims

1, a kind of following formula downhole electromagnetic heater and supporting well head well bore of rising has polished rod eye (1) on the well head, and connector (3), eccentric oil pipe are hung (6) and big four (7), and the down-hole has sets upright circle (9) and antiwind unit (12) on the oil pipe (8), it is characterized in that:

A, on eccentric oil pipe is hung (6), two through holes (39) are arranged, have from two through holes (39) on the bringing-up section upper and lower end of down-hole to hang in identical upper and lower electromagnetic heater with two downhole cables (4);

The profile of b, heater is long cylinder (11), its upper end embedded cable cap (18), lower end connect weighted lever (25), can form the support bar (20) of " eight " font after hinged the opening with bearing pin on the top of this cylinder (11), the terminal dress of bar (20) pulley is equipped with " V " shape flexure strip (19) between each bar (20) root and the cylinder; The arched frame (24) that the bottom has four bars to constitute, the two ends of arched frame (24) are hinged on the cylinder (11) with bearing pin;

C, stud with in cylinder (11) inside between support bar (20) and arched frame (24) and oil pipe (8) forms the convex contact (22) that electrically contacts, contact (22) exposes between cylinder (11), contact (22), groups of springs (28) and the inner formed chamber of cylinder (11) wall with groups of springs (28) felt pad (23);

D, cable (4) penetrate cylinder (11) through cable cap (18) and are connected with inside contact (22).

2, according to described heater of claim 1. and supporting well head well bore, it is characterized in that; Can be in cylinder (11) the both sides oblique back that penetrates of lower end two bars of arched frame (24) close up with bearing pin (47), is in the inner formation of cylinder (11) axle center hole plunger (45) and support spring (46) are housed closing up.

3, according to described heater of claim 1. and supporting well head well bore, it is characterized in that; On the cylinder face (11) on contact (22) opposite arch flexure strip (29) is housed, sheet (29) one ends are fixed, the oblique column body centre bore that penetrates of the other end, and this centre bore dress plunger (26) and spring (47), plunger (26) is hinged with arch sheet (29).

4, according to described heater of claim 1. and supporting well head well bore, it is characterized in that; Insulation sleeve (32,33) is equipped with in the contact position between polished rod eye (1) and polished rod (2), the hair plait (34), and at polished rod (2) upper end dress insulator cap (31).

5, according to described heater of claim 1. and supporting well head well bore, it is characterized in that: adorn insulation sleeve (37) between pipeline (35) on the pipe jointer (3) and the clip (36), insulated enclosure circle (38) is housed between the pipeline.

6, according to described heater of claim 1. and supporting well head well bore, it is characterized in that: dress insulation sleeve (40) in cooperation place between tubing hanger (6) and the big four (7), set upright circle on the oil pipe in the well bore (8) and adopt insulation to set upright circle (9); Down-hole oil tube (8) lower end antiwind unit (12) is divided into two bodies (41,43), adorns felt pad (42) back between two bodies (41,43) and is connected as a single entity with bolt (44), also adorns insulation sleeve (48) on the bolt (44).