Geophysical cable for exploration of inclined and horizontal boreholes

FIELD: cables for geophysical explorations.

SUBSTANCE: the cable has current conductors with an electric insulation of each conductor, multiple lays of the armor with a coating of plastic adhesive material. Each conductor is armored. The gaps between the armored conductors and the central part of the cable are filled with wires. The armored conductors and the wires are interweaved. The multiple lays of the amour are located on the interweaved armored conductors.

EFFECT: enhanced axial stiffness and efficiency of use.

5 cl, 1 dwg

 

The invention relates to wire and cable industries, namely manufacturing twisted wire products increased axial rigidity, and can be used for geophysical survey methods, inclined and horizontal wells devices attached to the cable.

In practice, the development of oil and gas fields is widely used design of wells with the conventional horizontal section of the trunk, carried out on a productive stratum. Information support of such wells during their construction and further operation is a complex problem due to technical difficulties the delivery of logging tools in horizontal sections of the wells.

The most common method of delivery devices in the well is feeding devices on the logging cable through the casing. The cable performs the role of information communication channel, carrying and pushing role.

An object of the invention is the design of the geophysical cable for exploration wells with high axial rigidity.

Known geophysical cable for the study of inclined and horizontal wells containing current-carrying conductor, electrical insulation, double layer Powel armor, over which a coating of plastic material, two additional launoy armor polivom, opposite the first layer of armor, and, finally, the total coating of plastic material filling the gaps between the individual wires in poliwag second layer of armor (see RF patent №2087929, 1997, G 01 V 3/18).

Cable design provides flexibility for winding on the drum, but at the same time reduces the axial stiffness by filling plastic gaps between the wires.

Known geophysical cable for exploration wells, consisting of one or more elektroizolyatsionnyh live lived and 3-6-layer armour galvanized steel wire, with a wire in each layer of armor is the increasing diameter and increasing the number (patent RF №2138834, 1999, G 01 V 1/40, 3/18).

In addition, geophysical cable can be performed in combination: an upper load-carrying part has a two - or four-layered armor of galvanized wire, and the lower part has additional armor, intermediate and outer casings of plastics material.

Cable design provides tensile strength 90-200 kN when the diameter of the cable for 10.1-36 mm, respectively.

Known armored wire rope enclosed in a plastic material containing a Central core made of multiple strands of wire and a few of the outer strands. In the space between what technicom and outer strands are separating strands, leaving free channels for the passage of the coating material, providing a filling of plastic material space from the core to the outer shell (see U.S. patent No. 4534162, 1983, D 07 B 1/16, 7/12).

The cable does not have sufficient rigidity to push the device into the oil wells.

Known geophysical cable for the study of inclined and horizontal wells, consisting of 3-7 live lived, covered with two or three pairs of layers of armor with oppositely directed povivami wires in each layer, while the second and third pairs of layers of armor made of wire, the diameter of which is 1.3 to 2.5 times the diameter of the wires of the first pair of layers of armor, and on top of each pair is applied under pressure to the coating of plastic adhesive material filling the gaps between the armor wires, and the external diameter of the cable is calibrated over the entire length in the range of 15-32 mm Diameter lower part of the cable is equal 28-32 mm, the average diameter part - 22-23, and the upper part has a diameter of 15-18 mm, and the cable has the same tensile strength along the entire length by maintaining a constant number and diameter of wires in the layers of Posiva armor, and changing the diameter of the cable is ensured by the presence or absence of intermediate shells of plastic material between the pairs of layers of armor and a changing step of Posiva brough and (see RF patent №2105326, 1997, G 01 V 1/40, 3/18) prototype. The cable has a strength 120-230 kN.

The shortcoming of this cable is the complexity of the fabrication layers of armor due to the large number of wires in each layer, leading to uneven tension swiveled wires in the strand layer, and, accordingly, to premature failure. The Central part of the cable does not have axial stiffness, which reduces the efficiency of the use of this cable in wells with different density environments. And finally, for the manufacture of such a cable may not be used serial cable cars, and cars of special design with a large number of spools that hinders the wide application of this cable.

The technical result of the claimed invention is to increase the axial stiffness of the cable and increase the efficiency of its use in the study wells, productive layers with different physical properties and different geological and technical conditions.

The technical result is achieved by the logging cable for the study of inclined and horizontal wells, consisting of conductive wires with electrical isolation for each core, multilayer powwow armor with a coating of plastic adhesive material, according to the image is the shadow, each lived performed armored, between armored cores and the Central portion of the cable is filled with wires, steel wires and wire fill retinue among themselves, while the layered polivy armor are stranded on armored veins. In addition:

the gaps between the twisted conductors and the Central portion of the cable is filled with round wires and/or shaped cross-section and a diameter of wires armor conductive wires and the diameter of the wires, filling the gap between the twisted conductors are (0,1-0,7) and (0,3-2,0) from the diameter of the wires of the outer layer of armor, respectively;

- diameter wires, filling the Central portion of the cable is (0,3-3,0) the diameter of the wire armor cable leads;

each conductor armoured one or more layers of wire;

- when booking conductive wires with several layers of wire between the layers is filled with plastic material.

The invention is illustrated in the drawing.

The drawing shows the design of the logging cable for the study of inclined and horizontal wells, consisting of five main elements: the conductors 1, 2 armor cable leads between vein filling and filling 3 the Central part of the cable round wire, the outer powwow armor 4 cable C is scrap, the polymer material 5 filling the voids of the cable, the layer of insulating material 6.

Features of cable construction are as follows.

To increase the axial stiffness of the cable, each conductor 1 is made of seven copper wires with a diameter of 0.37 mm by twisting the copper wires with the subsequent imposition on them of the insulating layer, then one or more layers of armor 2 steel round wire.

Three or more conductive wires 1 with superimposed layers of insulating material 6 and 2 armor from steel round wire twisted with each other.

In the process of twisting conductive wires 1 are simultaneously placed Central and marguilies fill 3 out of steel round wire or wire-shaped cross-section.

On top of twisted armored conductive wires wires 1 and fill 3 imposed under the pressure of the polymer shell 5 with the goal of filling all voids twisted conductive part of the cable.

The use of booking each conductor 1, the use of fill 3 in the intervals between the cores and the Central part of the steel cable round wire or wires shaped cross-section, and the filling of all voids twisted conductive part of the polymeric material allows you to get all the conductive part of the cable with high the Seva rigidity, what is missing in the sources of information that describes the design of geophysical cables.

Then twisted armored and covered with the polymer material of the conductive portion impose armor 4, made of two or more layers of steel round wires, and between the layers of armor 4 and over the outer layer of armor 4 superimposed plastic polymer shell. The lay direction of the layers of the armor of the cable need to be rotated.

Thus, manufacture of the core of the armored lived stranded between subsequent booking of the core and filling the interstices between the stranded conductors and the Central part of the cable wires substantially increase the rigidity in the Central part of the cable and the axial stiffness of the cable as a whole.

Additional structural differences allow us to optimize the value of axial stiffness. This applies to use to fill in the gaps between the twisted conductors and the Central part of the element wire of round and/or shaped cross-section.

The stated ratio of the diameter of the armor wires of each conductor and the diameter of the wire fill, defined, respectively, (0.1 to 0.7), (0,3-2,0) from the diameter of the wires of the outer layer of armor, allows to obtain a maximum value for the fill factor of the cable metal, equal to 0.7 (for well-known design is UCCI this coefficient is equal to 0.55-0,58), and, thus, further increase the axial stiffness of the cable.

The use of polymer material to fill all voids within the cable allows you to connect (make) wire fill, wire armor and veins, receiving a single aggregate rope cable, operating as a monolithic rod with additional axial stiffness, greatly enhancing the efficiency of delivery of the logging tool to the borehole bottom.

The invention is implemented on a test specimen cable the following syntax.

The conductive core made from a 7 round copper wires with a diameter of 0.37 mm, while the pitch copper wires 12 equal outer diameters of the conductors. The twisted copper wires fulfilled the left. On top of the copper conductive wires laid extrusion of polypropylene insulation thickness 1,5 mm

Armor cable leads were made from steel round wire with a diameter of 1.0 mm, while the pitch is equal to 7.5 mm diameter of armour. The direction of twisting wires right. Armored cable leads in the number three, three wire fill and one Central wire braid between the increments of 12 diameters of all conductive parts. The diameter of the wires fill equal to 2.5 mm, while the diameter of the Central wire - 1,0 mm

On top of twisted conductive hour and impose using the extrusion of a polymer shell around the ring, which are the top point wires filling, i.e. at the level of the diameter of the wires is filled. On top of the polymer shell conductive parts are put two layers of armor made of round steel wires. The pitch of each layer is equal to 7.5 diameters Posiva. The diameter of the wires of Posiva armor inner layer is 2.1 mm, the outer layer is 2.9 mm in the Direction of the internal povia - right, outer left. The ratio of the diameters of the wires of outdoor Posiva armor for wire diameters of armor the conductors equal to 2.9, and the wire diameter of the fill - 1,16 that meets the specified in the claims ratios (0.1 to 0.7), (0,3-2,0), which determines the diameter of the armor wires of the conductive wires and the diameter of the wire fill, respectively. The diameter of the Central wire is (0,3-3,0) diameter wire armor cable leads.

Prototype testing cable length of 50 cm compression showed that the axial stiffness of the cable exceeds the axial stiffness of the cable of the same diameter, but without the armor wires of the conductive wires and wires fill to 25%.

1. Geophysical cable for the study of inclined and horizontal wells, consisting of conductive wires with electrical insulation of each core, multilayer powwow armor with a coating of plastic adhesive material, characterized in that each lived performed armored, the gaps between the armored cores and the Central portion of the cable is filled with wires, steel wires and wire fill retinue among themselves, while the layered polivy armor are stranded on armored veins.

2. Geophysical cable according to claim 1, characterized in that the gaps between the twisted conductors and the Central portion of the cable is filled with round wires and/or shaped cross-section.

3. Geophysical cable according to any one of claims 1 and 2, characterized in that the diameter of the wires armor conductive wires and the diameter of the wires, filling the gap between the twisted conductors are 0.1-0.7 and 0.3 to 2.0 diameter of the wires of the outer layer of armor, respectively.

4. Geophysical cable according to any one of claims 1 to 3, characterized in that the diameter of the wires, filling the Central portion of the cable is 0.3-3.0 diameter wire armor cable leads.

5. Geophysical cable according to any one of claims 1 to 4, characterized in that each conductor armoured one or more layers of wire.

6. Geophysical cable according to claim 5, characterized in that when the multilayer armor of conductive wires between layers filled with plastic material.



 

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FIELD: oil and gas extractive industry.

SUBSTANCE: device has measuring tank and tachometer generator and pressure and temperature sensors on it. It is mounted at distance of one tubing pipe from extracting pump, where pressure is higher than saturation pressure, i.e. in one-phase liquid flow, and serves as connecting sleeve. At distance of two tubing pipes from deep station in connection sleeve additionally mounted is sensor of liquid hydrostatic pressure. Measurement of base parameters characterizing production of oil and gas product wells, is performed directly in the well close to position of extracting pump. Device allows to perform systematical measurements of product parameters individually for each product well at all stages of deposit extraction. Use of deep stations for measuring parameters of oil and gas wells product excludes use of expensive and complicated switching execution mechanisms of automated group measuring plants.

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1 dwg

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3 dwg

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