RU2696363C2 - Geophysical cable (options) and the wells research methods - Google Patents

Abstract

FIELD: oil and gas industry; mining.

SUBSTANCE: invention relates to the oil and gas and mining industries, in particular, to the geophysical surveys and special operations in vertical, directional and horizontal wells devices and methods. Geophysical cable with one or more electrically insulated conductors is made with one, or two, or three pairs of oppositely directed armor layers. At that, in order to increase the cable axial stiffness, contractile stability and to ensure the mounting downhole tools durability to 40÷70 % of making the 60÷300 kN and more the cable tensile strength, along with this, each pair of load bearing armor is made of wire of the same diameter, which value in the 2^nd and 3^rd pairs is 1.2÷2.5 times of the first pair of armor wires diameter. Cable is made with the possibility of application of the polymer or composite material coating with the necessary durability, thermal and chemical resistance onto each pair of armor. Also disclosed is the well testing method, in which the devices to the well delivery is carried out by means of a cable of the above-mentioned construction using the sealing wellhead systems and pushing devices.

EFFECT: increase in the cable axial rigidity and contractile stability, as well as the downhole tools to the cable attachment durability and, as a result, increase in the obtained research data information content.

2 cl, 1 tbl

Description

The invention relates to the oil and gas and mining industries, in particular to devices and methods for geophysical research and special work in oil and gas wells.

The essence of the invention: a special geophysical cable with one or more electrically insulated current-carrying conductors is made with one, two, or three pairs of oppositely directed armwires of galvanized steel wire, while to increase axial stiffness, anti-torsional stability and the required strength of fastening downhole tools to load-bearing armor within 40 ÷ 70% of the tensile strength of the cable, each pair of load-bearing armor is made of wire of the same diameter, the value of which in the 2nd and 3rd pairs is 1 , 2 ÷ 2.5 times the diameter of the wires of the first pair of armor, along with this, the first layer and the second layer of armor are made of wire with a diameter in the range of 0.64 ÷ 1.5 mm, the layer of third and fourth layers of load-bearing armor are made of wire with a diameter within 1.3 ÷ 3 mm, the fifth and sixth layers of the load-bearing armor are made of wire with a diameter of 1.6 ÷ 3.25 mm and, to ensure tightness, a coating of a polymer or composite material with the required wear resistance can be applied to each pair of cable armor , ermicheskoy and chemical resistance.

Such a cable has high tensile strength and rigidity while maintaining the necessary flexibility, allows you to work in vertical, directional and horizontal wells with zenith angles of up to 90 ° or more with various thermo-gas-chemical conditions, allows the use of sealing devices, injection systems for forced movement along the trunk wells.

Known commercially available load-bearing geophysical cables for geophysical research, shooting, blasting and other work in wells drilled for oil, gas, ore, coal and other minerals in one-, three- and seven-core versions with slightly different parameters in breaking strength, diameter , electrical insulating materials and other differences, but with one mandatory design - the use of a two-layer armor coating. See catalogs of cable products of factories: Tashkent (UZKABEL JSC), Pskov (Pskovgeokabel LLC), Perm (Permgeokabel LLC), Magnitogorsk (Galva Scientific and Production Center) and others.

Known designs of special geophysical cables for the study of deviated, deviated and horizontal wells (Patents of the Russian Federation No. 2087929 dated 03/12/1996, No. 2105326 dated January 20, 1997, No. 2138613 dated May 18, 1998, No. 2138834 dated December 25, 1999). 1998, No. 2209450 dated January 14, 2002) having a multilayer armor coating and shells made of a polymer material.

Close to the claimed inventions are the geophysical cable and the method of its use described in patent No. 2105326. The cable consists of three or more isolated current-carrying veins, covered with two or three pairs of armor layers with oppositely directed coils of wires in each pair, while the second and third pairs of armor layers are made of wire, the diameter of which is 1.3 ÷ 2.5 times larger the diameter of the wires of the first pair of layers of the armor, on top of each pair is applied under pressure a coating of plastic material filling the gaps between the wires of the armor. Using this cable, devices are delivered during well exploration.

Closest to the claimed inventions are the geophysical cable (options) and the method of research wells described in patent No. 2138834. The cable consists of one or more current-carrying electrically insulated conductors and three-, four-, or six-layer armor made of galvanized steel wire, the first armor layer is made of 11 ÷ 23 wires with a diameter of 0.64 ÷ 1.1 mm, the second armor layer is formed of a coil 12 ÷ 24 wires with a diameter of 0.99 ÷ 1.3 mm, the third armor layer is formed by a coil of 18 ÷ 36 wires with a diameter of 1.1 ÷ 1.7 mm, the fourth layer of armor is formed by a coil of 21 ÷ 36 wires with a diameter of 1.3 ÷ 2.4 mm, the fifth and sixth layers of armor are formed by coiling 30 ÷ 36 wires with a diameter of 1.3 ÷ 3 mm, while between the layers of armor and over it may be coated with polymeric or other material.

In addition, a geophysical cable for researching wells, consisting of one or more electrically insulated current-carrying conductors, can be combined, the upper load-carrying part of which has two or four-layer armor made of galvanized wire, and the lower part has armor and an intermediate and outer shell of polymer material while the first armor layer of the upper and lower parts of the cable is formed by a coiled 11 ÷ 23 armor wires with a diameter of 0.64 ÷ 1.1 mm, the second armor layer is formed by a coiled 12 ÷ 24 wires with a diameter of 0.99 ÷ 1.3 mm, the third the armor layer is formed by a coil of 18 ÷ 36 wires with a diameter of 1.1 ÷ 1.7 mm, the fourth armor layer is formed by a coil of 21 ÷ 36 wires with a diameter of 1.3 ÷ 2.4 mm, the upper load-bearing part of the cable has a diameter of 10.1 ÷ 22.2 mm, the lower part up to 75% of the total length has a diameter of 28 ÷ 38 mm and two additional layers of armor located between the outer and intermediate shells of polymer material, and the third and fourth layers of armor may be absent in the section of the lower part from the end of the cable.

The described cables are used in well surveys to deliver instruments in the study interval.

The disadvantages of these cables are the following:

1. The combined design of the cable greatly complicates the work on the well due to the different cable diameters in length in terms of the use of wellhead sealing devices and push systems.

2. The use of wires of different diameters in pairs with oppositely directed tufts of cable armor:

a) complicates the design of load-bearing devices for connecting downhole tools.

b) reduces axial stiffness and anti-torsional stability of the cable.

c) it makes it difficult to ensure the required strength of fastening downhole tools to the cable.

g) complicates the technological process of manufacturing a cable.

3. The requirements for polymer materials used for coating cables are not reflected.

An object of the invention is the creation of new geophysical cables for conducting well research and special work on swabbing wells, gas-dynamic effects on the productive formation to intensify the work of the wells, testing the formations with cable testers, cleaning the borehole zone of productive formations with special devices requiring cables with the highest axial rigidity and anti-torsional stability, durability of fastening of downhole tools to the load-bearing armor minutes within 40 ÷ 70% of the tensile strength of the cable, which allow execution of works in vertical, directional and horizontal wells with zenith angle to 90 ° or more with different termogazohimicheskimi conditions, to apply a wellhead sealing devices and push systems.

The stated technical problem is solved by the fact that a geophysical cable with one or more electrically insulated current-carrying conductors and two-, or four-, or six-layer armor made of galvanized steel wire, characterized in that for increasing axial stiffness, anti-torsion stability and required the strength of fastening downhole tools to the load-bearing armor within 40 ÷ 70% of the breaking strength of the cable, each pair of load-bearing armor is made of wire of the same diameter, the value of which about in the 2nd and 3rd pairs 1.2 to 2.5 times the diameter of the wires of the first pair of armor, along with this, the first layer and the second layer of armor are made of wire with a diameter in the range of 0.64 ÷ 1.5 mm, coils of the third and fourth layers of load-bearing armor - made of wire with a diameter within 1.3 ÷ 3 mm, coils of the fifth and sixth layers of load-bearing armor - made of wire with a diameter within 1.6 ÷ 3.25 mm and to ensure tightness for each pair of cable armor may be coated with a polymer or composite material with the necessary wear resistance new, thermal and chemical resistance.

The technical result according to the first paragraph of the claimed invention is achieved by the fact that a geophysical cable is proposed, consisting of one or more electrically insulated current-carrying conductors and two-, or four-, or six-layer armor made of galvanized steel wire, characterized in that to increase axial stiffness, anti-torsional stability and the required strength of fastening downhole tools to the load-bearing armor within 40 ÷ 70% of the tensile strength of the cable, each pair of load-bearing armor is made of wire of the same diameter RA, the magnitude of which in the 2nd and 3rd pairs is 1.2 ÷ 2.5 times the diameter of the wires of the first armor pair, along with this, the first and second armor layers are wound from wire with a diameter in the range of 0.64 ÷ 1, 5 mm, coils of the third and fourth layers of load-bearing armor - from wire with a diameter of 1.3 ÷ 3 mm, coils of the fifth and sixth layers of load-bearing armor - from wire with a diameter of 1.6 + 3.25 mm and to ensure tightness for each a pair of cable armor can be coated with a polymer or composite material having the necessary wear resistance, thermal and chemical resistance.

The technical result according to the second paragraph of the claimed invention is achieved by the fact that the applied method of research wells, including the delivery of devices in the research interval, characterized in that the delivery of devices in vertical or directional or horizontal wells with zenith angles of up to 90 ° or more with different thermogasochemical conditions carried out using a cable according to the first paragraph with the possibility of using sealing devices, injection systems for forced movement along the wellbore.

Technical parameters and cable design and its options are given in table 1.

Information sources

1. RF patent No. 2087929, G01V 3/18, 03/12/1996.

2. RF patent No. 2105326, G01V 3/18, 01/20/1997.

3. RF patent №2138613, 6 ЕВВ 23/08, 05/18/1998.

4. RF patent No. 2138834, G01V 1/40, 3/18, 12/25/1998.

5. RF patent No. 2209450, 7 G01V 1/52, 3/18, Н01В 7/18, 01/14/2002.

Notes:

1 The temperature resistance of the cable is determined by the electrical insulation, polymer or composite materials used in its design

2 The table shows some of the possible cable options. Designs are developed individually for specific mining and geological cable operating conditions

Claims (2)

1. Geophysical cable, consisting of one or more electrically insulated current-carrying conductors and two-, or four-, or six-layer armor made of galvanized steel wire, characterized in that to increase the axial stiffness, anti-torsional stability and the required strength of fastening downhole tools to the load-bearing armor in within 40 ÷ 70% of the tensile strength of the cable, each pair of load-bearing armor is made of wire of the same diameter, the value of which in the 2nd and 3rd pairs is 1.2 ÷ 2.5 times the diameter of the wires of the first pair of armor, along with this, the coils of the first and second layers of armor are made of wire with a diameter in the range of 0.64 ÷ 1.5 mm, coils of the third and fourth layers of load-bearing armor are made of wire with a diameter of between 1.3 and 3 mm, the coils of the fifth and sixth layers of load-bearing armor - from a wire with a diameter in the range of 1.6 ÷ 3.25 mm and to ensure tightness on each pair of armor cable can be coated with a polymer or composite material with the necessary wear resistance, thermal and chemical resistance. 2. A method of researching wells, including the delivery of devices in the research interval, characterized in that the delivery of devices to vertical or directional or horizontal wells with zenith angles of up to 90 ° or more with different thermogasochemical conditions is carried out using a cable according to claim 1 with the possibility the use of sealing devices, injection systems for forced movement along the wellbore.