RU202982U1 - Geophysical cable with optical fiber and capillary tube - Google Patents

Abstract

The utility model relates to geophysics and the oil industry and is intended for the injection of liquid chemical compounds with simultaneous and separate conduct of geophysical surveys and work in wells. The geophysical cable contains armor 1, conductive cores 2, insulation 3, and a central tube / capillary 4, which provides a hydrodynamic communication channel. Armor 1 has outer 5 and inner 6 wire layers. The cable is additionally equipped with a fiber optic module, the optical fibers 7 of which are placed in one or more metal tubes 8, made in the form of one or more wires of the inner layer 6 of the armor. The conductive cores 2 are located in the insulation layer 3 around the central tube / capillary 4. The technical result is the expansion of the arsenal of technical means, i.e. in the creation of a geophysical cable design that allows it to be stabilized under load without violating the integrity of the optical fiber and capillary channel, while ensuring the transfer of viscous media from the surface to the well and back, carrying out measurements by means of optical fiber to control technological processes in the well with the study of the temperature field of the section , as well as the work of devices with an electric communication channel, alternative to the device to the prototype and free from its shortcomings. 2 ill.

Description

Technology area

The utility model relates to geophysics and the oil industry and is intended for the injection of liquid chemical compounds with simultaneous and separate conduct of geophysical surveys and work in wells.

State of the art.

Known design of the umbilical, including a number of pipes for the transfer of fluid materials, electrical conductors assembled in a bundle, filling material surrounding the listed elements, rods made of composite material, and an outer protective sheath [Invention patent RU 2368755, IPC E21B 17/00, publ. 09/27/2009].

The disadvantage of some models of this cable is its insufficient strength properties, which do not allow working at high hydrostatic pressures of the order of 250 atmospheres, corresponding to depths of 2500 m and more.

Known design of the cable channel used in construction work. The product is a rectangular enclosing product with a cavity inside. The channel cable body is made of plastic or metal material. The cavity can be filled with any elements at the discretion of the owner [https: //srbu.ruyelektrika-v-dome-i-kvartire/461 -kabel-kanaly-vidy-i-razmery.html].

The known construction of a geophysical cable, including a cable of metal wires, laid in such a way that a free channel is formed in the center, and one or more optical fibers laid in the specified free channel, and the specified free channel and the free space between the metal wires of the cable are filled with a material with low modulus of elasticity [Patent for utility model RU 156786 MPK N01 V 11/22, publ. 19.02.2015].

The disadvantage of this cable is its low mechanical strength, which, with a decrease in the hydrostatic pressure in the well (creating a depression), will lead to depressurization of the cable, and in the case of hoseing (coating) with a polymer, it can lead to rupture of the outer polymer sheath. In addition, the cable, when stabilized under load, can waste the fiber margin laid down for temperature compensation of the expansion of steel wires, which will lead to fiber breakage in an accidental place.

The known design of a geophysical cable, for operation mainly in oil wells. The cable consists of a central metal tube in which optical fibers are placed in a hydrophobic gel, power elements in the form of steel wires arranged in a circle, and an outer polymer coating [Patent for invention US 23225471, 21.03.2003].

The known design of a geophysical cable, including the outer and inner layers of armor with a possible layer of insulation between them, insulator cushions located around the central steel capillary made of stainless steel, which is an additional conductive core and a carrier containing an optical fiber [Patent for utility model RU 131897 IPC Н01В 7 / 24, publ. 27.08.2013].

The disadvantage of the above technical solutions is the inability of products to bending loads, to work under conditions of high hydrostatic pressures of more than 250 atm, and to the effect of an aggressive environment. Also, the structural arrangement of the transmission channel of viscous media and optical fiber in these designs does not always allow cable stabilization and its operation, especially when exposed to ultimate breaking loads.

Known closest in technical essence and the achieved result to the proposed load-carrying geophysical cable containing armor, conductive cores, insulation and a central tube / capillary, providing a hydrodynamic communication channel. [Prototype p. No. 35035 IPC Н01В 7/00, publ.20.12.03].

Disadvantages of the prototype: Insufficient resistance of the cable to bending loads, unsuitability for work in conditions of high hydrostatic pressures of more than 250 atm. and exposure to an aggressive environment.

The essence of the utility model

The problem solved by the utility model is the creation of a simple and reliable geophysical cable design, free from the shortcomings of the prototype.

The above problem is solved, and the technical result is achieved using the features indicated in the formula of the utility model that are common with the prototype, such as a geophysical cable containing armor 1, conductive cores 2, insulation 3 and a central tube / capillary 4, providing a hydrodynamic communication channel, and distinctive significant features, such as armor 1 has outer 5 and inner 6 wire layers, while the cable is additionally equipped with a fiber optic module, the optical fibers 7 of which are placed in one or more metal tubes 8, made in the form of one or more wires of the inner layer 6 of the armor, and the conductors 2 are located in the insulation layer 3 around the central tube / capillary 4.

The technical problem solved in the proposed utility model consists in expanding the arsenal of technical means, i.e. in the creation of a geophysical cable design that allows it to be stabilized under load without violating the integrity of the optical fiber and capillary channel, while ensuring the transfer of viscous media from the surface to the well and back, carrying out measurements by means of optical fiber to control technological processes in the well with the study of the temperature field of the section , as well as the work of devices with an electric communication channel, alternative to the device to the prototype and free from its shortcomings.

List of graphic materials.

FIG. 1. Dependence of fluid flow rate on pumping pressure

FIG. 2 Cross section of the cable.

Information confirming the feasibility of the utility model.

The choice of the capillary channel design is determined by the maximum pumping pressure generated by the ground equipment, expressed in pascals, the required operating fluid flow rate (flow rate), the properties of the liquid and the time frame allocated for the pumping procedure. All this is reflected in the following formula:

where, Q is the flow rate, m ³ / s; r is the radius of the capillary, m; P is the pumping pressure, Pa; μ is the viscosity of the fluid, Pa⋅s; l - capillary length, m.

For clarity, FIG. 1 shows the dependences of the flow rate of liquids with different values of viscosity passing through a capillary with a diameter of 2 mm and a length of 1000 m at different pumping pressures [A.V. Robin, A.A. Sementsov, A.V. Shumilov. Well development with a geophysical cable equipped with an internal capillary // Karotazhnik. - 2008. - No. 11 (176). - S. 97-106].

The technical result is achieved by the fact that in the center of the geophysical cable there is a capillary tube having a certain diameter, which provides the necessary flow rate of fluid for pumping over a distance equal to the length of this cable.

The following conditions contribute to the achievement of the technical result:

- the tube is located in the center of the cable, it is removed from the armor, which carries the main breaking load;

- optical fibers are placed in one or more tubes made in the form of one or more wires of the inner layer of the armor;

- the conductors are located in an insulation layer around the central tube / capillary.

The design of the geophysical cable (Fig. 2) includes: armor 1, conductive conductors 2, insulation 3 and a central tube / capillary 4, which provides a hydrodynamic communication channel.

Armor 1 has outer 5 and inner 6 wire layers. The cable is additionally equipped with a fiber optic module, the optical fibers 7 of which are placed in one or more metal tubes 8, made in the form of one or more wires of the inner layer 6 of the armor. The conductive cores 2 are located in the insulation layer 3 around the central tube / capillary 4 (see Fig. 2).

Armor 1 consists of a metal wire placed in a single or multi-layer filament, or a counter filament along a multi-lead helical line.

This description and drawings are considered as material illustrating a utility model, the essence of which and the scope of patent claims are defined in the following formula, a set of essential features and their equivalents.

Claims (1)

Geophysical cable containing armor 1, conductive cores 2, insulation 3 and a central tube / capillary 4, providing a hydrodynamic communication channel, characterized in that armor 1 has outer 5 and inner 6 wire layers, while the cable is additionally equipped with a fiber optic module, optical fibers 7 which are placed in one or more metal tubes 8, made in the form of one or more wires of the inner layer 6 of the armor, and the conductive cores 2 are located in the insulation layer 3 around the central tube / capillary 4.

Images