CN1006918B - Technology for installing bunched cables having strands with different diameter into a well - Google Patents

Abstract

The present invention relates to a processing technology for a well which is provided with cable bundles containing diameter-changing strands. A winding device is used, and a cable bundle is composed of windable electricity transmission cables, windable heating cables and at least one weight bearing strand. The cable bundle can be used for electrically heating or heating and measuring a long section of underground stratum. The cable bundle is arranged in the well by the following method that the strands in the cable bundle are wound on a winding disc to form flat strand layers; windable belts of which the widths are approximately the same as the widths of the strand layers are alternately wound in the middle of the strand layers; simultaneously, the electricity transmission cables and the heating cables are mutually connected in wire winding; then, the strands are put into the well, and bundled into bundles off and on; simultaneously, the windable belts are wound another winding disc.

Description

Technology for installing bunched cables having strands with different diameter into a well

The present invention relates to the well treatment process, this technology is used to install the cable bundle that contains two strands at least, and per share line has different diameters along the different parts of its length direction.Especially, the present invention relates to can be heatedly the installation of the electric heater on very long one section stratum down, and when needing, can utilize by what the face of land extended bringing-up section and can measure the temperature that is heated the district simply around the well conduit.

Knew already, next section stratum, ground was heated to higher temperature in the long time, can obtain many benefits.These benefits comprise the oil shale rock stratum pyrolysis, on-fixed oil reservoirs fixing, in oil reservoirs, can be used as the formation in the big conductive carbonized district of electrode, the hydrocarbon heat of using from oil or heavy oil moves on to production area or the like.The prior art that realizes this class result is included in the following US Patent specification: United States Patent (USP) 2,732,195 have narrated utilization has iron or reusable evanohm resistor, to underground 20 to 30 meters thick oil shale layer heating, makes its temperature reach 500 to 1000 ℃ process.G.A. Smith's United States Patent (USP) 2,781,851 has been narrated and has been used the mineral insulation copper armouring low-resistance heating cable that contains three copper conductors, makes temperature reach 250 ℃, to prevent to form hydrate.When gas generation, heater is by the steel band mechanical support and be immersed in the oil sump to prevent corrosion.

In U.S. Patent No. 4,442, in 903, existing a kind of installation contains and comprises that at least a load-bearing strand and at least two different parts along its length direction have the method for cable bundle of the strand of different thicknesses, it comprises: the strand of different thicknesses is supported on the wire spool, wire spool have spacing near and be a bit larger tham the flange that the thickest part of strand is lined up the width of one deck side by side; Together send into described load-bearing strand and intrafascicular other strand and the uneven strand of thick line of cable in the well; Tie up the strand that just enters in the well, it is close to mutually, so that enough strong with the CONTACT WITH FRICTION of load-bearing strand, but the weight of support card interband strand.

This method has such shortcoming, to have can being wrapped on the wire spool of different thicknesses along the different parts of its length direction around strand (these positions with respect to the diameter difference of strand than long), wire spool is wideer than one deck strand that is arranged side by side, and so thinner strand will be around between the thick line and be pressed in already on the thinnest strand on the wire spool.This will cause wire spool whenever around a circle, and the thin strand that twines on it will be lacked compared with thick strand.When the unwrapping wire operation is installed in the down-hole with strand, wire spool whenever around a circle institute around under thick strand and the load-bearing strand grown couple together, and do not produce unfavorable bending or fold, it if possible also will be very difficult doing like this.And, in the situation that a large amount of strands are installed, comprise several the strands that different thicknesses is arranged along the different part of its length direction, if the strand of every different thicknesses all from the wire spool separately around last around down, it is crowded that the working space of well head will become, and can make installation work can not finish or be difficult to and carry out.The present invention is preceding topic how to avoid most of congested problem at least in part.

Therefore, purpose of the present invention is exactly the cable bundle of settling from a wire spool that becomes the diameter strand that contains, but the every line of wire spool one circle institute around under the thick strand of length do not produce nonideal bending or fold.

Method of the present invention is characterized in that comprising the steps:

But strip winding in the winding, this band (a) can trail between the wire spool flange, and on the strand layer of (b) lining up side by side across the different thicknesses strand, to form smooth basically surface, receives one deck strand down;

The strand unwrapping wire of different thicknesses is sent in the well, but simultaneously strip winding is wound on another Winder.

Explain the present invention with reference to the accompanying drawings in detail, wherein:

Fig. 1 is the schematic diagram of according to the present invention a branch of cable being sent in the well.

Fig. 2 represents to be installed in according to the present invention the part of the electric heater device in the well.

Fig. 3 represents to be suitable for use as the joint between the metal armouring cable of the change diameter strand that the present invention installs.

Fig. 4 represents with the situation that is suitable for a share of cable bundle of method binding of the present invention.

Fig. 5 is the schematic diagram that is wound with the wire spool of the uneven strand of thickness according to the present invention.

Fig. 1 has represented to be suitable for installing the layout structure of very big cable bundle, and this cable bundle comprises 6 strip metal armored electric heater cables, and one can be around steel pipe, two thermocouple cables and a load-bearing strand.As shown in the figure, well is equipped with the conduit 1 of band well head, and sleeve pipe 2 is suspended from the well head.Support frame 3 is installed in the well head top, is supporting the upper and lower strand of road guided mode 4 and 5 that separates.

Shown in situation in, cassette tape 6 is bundled in around the cable bundle that enters sleeve pipe 2.Be tied with cable 8 on the wire spool 7, this cable is along its length direction thickness difference, but wire spool 7 also is tied with strip winding 9 between cable floor.Cable is sent in the well through the pulley 10 or the similar guiding device that are installed on the vertical support frame (not shown).But strip winding 9 turns around on the wire spool 11 simultaneously.Except cable 8, a pair of thermocouple cable 12 also on the wind (not shown) around down, send in the well through pulley 13.Similarly, steel pipe 14 around down, is sent in the well through pulley 15 on the wind (not shown).Load-bearing metal strands 16 around down, is sent in the well through pulley 17 on the device (not shown).

The cable bundle is gathered by upper and lower guiding block 4 and 5.Cassette tape (as cassette tape 6) is tightly tied the cable bundle, makes frictional force between strand and load-bearing strand such as the wire 16 be enough to the weight of support card interband strand.The machinery binding apparatus when applying power, can pass as snap ring 6a reelability cassette tape such as steel band are strained, and with the snap ring cockle, cassette tape is fixed on the tram, and this class device is available.For example, a suitable device is Signode Air Binder Model PNSC34, and other suitable device can have been bought from Rede or Centrilift Pump company.

Fig. 2 represents the lower end of heater.As shown in the figure, the bottom of sleeve pipe 2 envelope has every liquid cap 20.Load-bearing wire 16 is drawn into the bottom of sleeve pipe 2 in advance by the stone roller 18 that hangs down.The junction, end 19 of a pair of heating cable (as forming those cables of minimum heater) is banded on the wire 16 by cassette tape 6.Thermocouple 12 will be banded on the wire too in the place near the junction, end.Produce the place of high temperature at minimum heater, be preferably in the heater top and adopt one section steel armouring mineral insulated cable, to keep a cool relatively section, this section cable has the external diameter identical with heater cable, but its conductive cores wants enough thick so that can not produce high temperature to heating installation power supply.As shown in the figure, in the upper end of this cool section, thick power transmission cable 8a as connector 21, is connected in thinner heating cable 8b by connector or connector.

Fig. 3 represents a cable binders as connector 21, cable 8 thicker power pack 8a is connected in the thin part 8b that keeps constant high temperature, and does not produce too much heat, so that a buffer area is provided between electricity cable and heater.Shown in the connector, outer tube 21 is drawn together round the cable conduction core coupling part that insulation protection is arranged.In most preferred embodiment, power pack 8a comprises copper armouring, mineral insulation, copper core cable, and heating cable part 8b comprises steel armouring, the copper core cable that mineral insulate, diameter is very thin.

When Fig. 4 has represented in the cable bundle enters as the sleeve pipe of sleeve pipe 2, the cable bundle that binds together by cassette tape.As shown in the figure, the cable bundle comprises 8, two thermocouple cables 12 of six cables and can be around steel pipe 14, and filling in can be around steel pipe 14, can increase the frictional force with wire 16, even if also like this near the place of cable binders such as connector 21.Preferably allow cable binders be positioned at the position that three connectors 21 can contact three 8a armatures of cable.In such structure, the frictional force that enough supports very long strand weight is easy to pass to the intrafascicular all strands of cable, even if in those places of containing connector or change diameter strand node place, also be like this.

Fig. 5 is a schematic diagram, and being illustrated in different parts has the strand of different thicknesses (as metal armouring power transmission cable 8a and heating cable 8b), and the better arrangement architecture on wind 7, wind 7 have the wire spool 7a of flanged pin 7b.Distance between the flange 7b on the 7a of wire spool surface near and the strand that is a bit larger tham different thicknesses be arranged into the width of one deck with its thickest part.At strand is that its thickest part comprises the connector as connector 21 in the situation of cable 8 of different thicknesses.Fig. 5 has represented that one deck is wrapped in six cables 8 on the wire spool 7a, and their inner terminal is connected in or is suitable for being connected in the element that joins with power supply.But strip winding 9 is wrapped on the wire spool simultaneously, covers on every layer of strand layer and also is stretched over flange 7b basically, on the thickest part of strand, forms bigger flat surfaces effectively, continuously, can be around following one deck cable on it.

As shown in Figure 5, strand comprises by the topmost heater that to the cable between the lower heater owing to there is not power transmission cable to lead to the topmost heater, left space can be occupied by fill a vacancy line such as line 22.Thereafter, when cable was put into the down-hole, this class line of filling a vacancy can be wound on another wire spool, and its method is identical with the method for recoiling reelability band 9.

Claims (3)

1, a kind of installation contains the method for cable bundle that at least one load-bearing strand and at least two different parts along its length direction have the strand of different thicknesses, comprising:

The strand of different thicknesses is supported on the wire spool, wire spool have spacing near and be a bit larger tham the flange that the thickest part of strand is lined up the width of one deck side by side;

Together send into described load-bearing strand and intrafascicular other strand and the uneven strand of thickness of cable in the well;

Tie up the strand that just enters in the well, it is close to mutually, so that enough strong with the CONTACT WITH FRICTION of load-bearing strand, but the weight of support card interband strand;

It is characterized in that also comprising:

But strip winding in the winding, this band (a) can trail between the wire spool flange, and: (b) on the strand layer of lining up side by side across the different thicknesses strand,, receive one deck strand down to form smooth basically surface;

The strand unwrapping wire of different thicknesses is sent in the well, but simultaneously strip winding is wound on another Winder.

2, method according to claim 1 is characterized in that wherein the uneven strand of thickness is meant metal armouring, the transmission of electricity of mineral insulation and the coupling part head to head of heating cable.

3, method according to claim 1, it is characterized in that wherein entering cable bundle in the well comprises can be around steel pipe.

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