Reinforced polymeric sheath covered geophysical load-carrying cable and its application process

FIELD: geophysical investigations; cables for oil and gas wells.

SUBSTANCE: proposed reinforced polymeric sheath covered geophysical load-carrying cable whose specific mass and cost are comparable with mass produced ones but whose armor wires are reliably protected against detrimental impact of chemically active liquid of wells has one or more insulated conductors and is provided with at least two steel-wire armor lays permitting intermediate sheaths and polymeric sheath overall; the latter is reinforced by steel wire net with longitudinal and transversal sizes of cell amounting to 1 - 10 diameters of wire. Armor of cable armor and/or of polymeric-filler reinforcing member may be produced from steel wire free from zinc coat provided overall sheath is used. Reinforcing materials are polypropylene, polyamide, or self-curing material threads. Air gaps between armor wires and/or reinforcing members of sheath are filled with self-curing sealing compound, such as thiokol or silicone compound. Proposed method for investigating wells, including those where hydrogen sulfide content and wellhead pressure are high involves tripping of geophysical instruments and pieces of equipment by means of cable; in the process tripping operations are conducted using reinforced polymeric sheath covered geophysical cable. Work in wells using cable of proposed mechanical design is identical to technology with mass-produced geophysical cables, but in the former case work can be done with minimal cost in wells containing hydrogen sulfide and those where wellhead pressure is high.

EFFECT: minimized cost and ability of using proposed cable in hydrogen sulfide environment of wells at high wellhead pressure.

5 cl, 4 dwg

 

The invention relates to the field of geophysical research and can be used on cables in oil and gas wells.

Known commercially available load-carrying geophysical cables for logging, swabbing, perforating oil and gas wells that have design from 1-7 elektroizolyatsionnyh conductive wires and two or four Posiva armour galvanized steel wire, each of which has a direction opposite to the previous one, in accordance with OST-39.1-005-00.

Known special cables for wells with aggressive, mainly hydrogen sulfide and acid medium armor which is made of special alloy steels. The drawback of this cable design is its extremely high cost, 15-20 times higher than the cost of the serial cable.

Also known cables for harsh environments with an outer shell of polymer materials. When this type of cable may slide shell due to insufficient adhesion of polymeric material with wire armor, especially during tripping operations through the packing device under the action of the downhole pressure.

The closest structure is the cable described in patent No. 2209450 from 14.01.2002. This cable consists of three or more isolated current-carrying veins covered with two or three pairs of layers of armor with oppositely directed povivami wires in each pair, moreover, in the upper layer of armor wire can be laid down to 50% packing density of wires in the layer, and the intervals between the wires is filled with a polymer material. The disadvantage of this performance cable is its large outer diameter and accordingly muscularity associated primarily with the purpose cable for the study of horizontal and horizontal directional drilling.

The objective of this invention to provide a cable construction, similar in weight and is comparable in cost with commercially available geophysical cables, but having a reliable protection of the armor wires from corrosive downhole fluids, the ability to work through seal device with a high wellhead flowing pressure of the well, and prevent removal of the downhole fluid and gas wires armor when lifting cable to the surface.

To achieve this goal the cable construction.

Carrying geophysical cable with reinforced polymer shell containing one or more elektroizolyatsionnyh conductive wires having at least two powwow armor steel wire, allowing the presence of the intermediate shell and the outer shell of polymeric material, while the outer shell is reinforced with a mesh of steel the wire with unit cell dimensions Lxy in the longitudinal and transverse dimension, is 1-10 times the diameter of the wire.

The choice of a specific design of reinforced cable sheath and size of the cell is formed by a steel wire, is determined by a number of operational factors, which include: the weight of the cable, the depth of his descent, the desired breaking strength. So, traditionally used in carrying armored cables manufactured in accordance with OST 153-39.1-005-00 have wire armor, made of galvanized steel wire, laid in two divergent Posiva. The main mechanical properties of the cable are determined mainly used wire armor: number of wires, the diameter and geometry of wires in poliwag. Operational characteristics of each Posiva by the following values:

- Breaking strength of the cable Nk for each OViVO will be:

PC=n·d/cos(α)·δ/1000, (kN),

where n is the number of wires in povile,

d is the wire diameter in povile, mm,

cos(α) is the cosine of the angle wire Posiva to the centerline of the cable,

δ - breaking strength of individual wires, N/mm2.

The fill factor KZ Posiva wire is defined by the following expression:

KZ=n·d/cos(α)/(π·(D+d)),

where n is the number of wires in povile,

d is the wire diameter in povile, mm,

cos(α) - to the sine of the angle wire Posiva to the centerline of the cable,

D - inner diameter of Posiva, mm.

- The weight of the wire armor cable PN for each OViVO will be:

Ru=ρ·n·π·d2/(4·cos(α)), (kg/km)

where ρ - the specific density of the material of the armor wires, kg/cm3,

n is the number of wires in povile,

d is the wire diameter in povile, mm,

cos(α) is the cosine of the angle wire Posiva to the centerline of the cable.

The size of the cell Lxy formed by the wires of the reservation, approximately can be expressed through the fill factor, short circuit, as follows: Lxy≈1/KS-1.

Parameter Lxy is dimensionless and describes the relation of the visible and the actual measured gap between the wires to the wire diameter and more convenient to represent the overall picture obtained wire mesh in the manufacturing process of the cable. The fill factor KZ Posiva wire is mainly used when designing the cable design and engineering calculations.

On the basis of comparisons you can compare the operational characteristics traditionally used three-core cable KG3×0,75-60-150 and cable, similar to the electrical parameters of the cable, with the polymer-steel shell KG3×0,75-35-150-OA.

Cable KG3×0,75-60-150 has the following characteristics: diameter of 10.2 mm, specific weight of 432 kg/km (p is boloki armor 350 kg/km) breaking strength - 75 kN, the fill factor KS=0,97-0,99. When the cable running to a depth of 6000 m with geophysical instrument weighing 100 kg load on the logging winch on the surface taking into account the buoyancy force of the well fluid will be 2100 kg, which is 28% of the breaking load of the cable and only 4.7% of the useful life of the descent of the cargo (logging tool).

Cable KG3×0,75-35-150-OA has the following characteristics: diameter of 11.0 mm, specific weight of 280 kg/km (wire armour 170 kg/km)breaking strength - 38 kN, the fill factor KS=0,4-0,45. When the cable running to a depth of 6000 m with geophysical instrument weighing 100 kg load on the logging winch on the surface taking into account the buoyancy force of the well fluid will form 1120 kg, which is 29% of the breaking load of the cable and 9% of the useful life of the descent of the cargo (logging tool).

Thus, the use of both structures cable provides more than three-fold margin of bursting strength, but the proposed construction of the cable has a higher efficiency tripping operations and lower load to ground geophysical equipment - reducing traction winch almost 1000 kg

In addition, the above correlation, in particular the fill factor Posiva wire affect the following operational and technological PA is ometry cable:

- filling the gaps between the armor wires of the polymeric material increases the axial stiffness of the cable, resulting in increased propulsion efforts on geophysical instrument, which is especially important when the cable in the horizontal and horizontal directional wells. Testing of cable designs were carried out on the test Installation, axial compression" OOO PskovGeoKabel in a pipe with a diameter of 150 mm and a length of 6 m by comparing the efforts applied to the cable at the beginning of the pipe, and efforts received at the end of the pipe. For cables of traditional design transfer efforts at the end of the pipe was stopped after application of force 15÷25 kg For similar cables with polymer-steel shell, the figure was 45÷70 kg

- The presence of polymer-steel sheath on the cable plays a positive role when the cable through the gland of the device at high manifold pressures wells. Traditional cable with round wire armour has meipromoligne gaps, through which the leakage of well fluid or gas at pressures on the mouth more than 1 MPa, to achieve complete sealing of the cable through the cable clamp in the sealing device is practically not possible. Polymer-steel sheath prevents the emission of borehole substances in estuarine pressures up to 15 MPa.

- Proposed the polymer may-steel sheath protects the armor wires of the cable, which and load-carrying elements, from the effects of borehole fluid, in which perhaps the content of water solutions of acids, alkalis, causing premature corrosion of the steel wire and the cable exits the system.

Particularly useful application of the proposed design of the cable into the wells with a high content of hydrogen sulfide, as in the case of application in these wells cables traditional design life of the cable failures is one tripping operation. We offer OST 153-39.1-005-00 for operation in hydrogen sulfide wells cables with armour of special stainless wire has cost 8÷12 times higher than the cost of cable with armour of steel wire.

The fill factor, short circuit or the mesh size of the wire mesh has an important role in the manufacture of cable and limited technological capabilities of the equipment and the technical requirements of the cable (hardness, breaking strength, weight etc). For example, when the value of the size of the grid cell, formed by povivami wires, less than one wire diameter, filling these gaps polymeric material becomes difficult, because this operation is carried out by extrusion lines and polymer melt under pressure fills the gaps wires. At low cell wires is prezhdevremennaya melt and incomplete filling of gaps, that could lead to delamination of the shell, the penetration of gas or liquid into the shell and its subsequent damage with the rapid rise of the wells due to the difference of external and internal pressures.

The size of the grid cell Lxy, is 5÷10 wire diameters used in cases when it is necessary to provide a high breaking strength and/or increased axial rigidity and to ensure the grid is formed of two powwow wire, and three or four, which leads to an increase of the layer thickness required to fill the polymer.

It is also possible embodiment variants of the proposed design of the cable.

The cable armor and/or a reinforcing element of a polymeric filler in the presence of the outer shell may be made of steel wire without zinc coating.

To reduce the weight of the cable as a reinforcing material applied polypropylene, polyamide, cotton or synthetic threads.

Air gaps between the armor wires and/or reinforcing elements shell filled simoultaniously sealant, for example, tiolovam or silicone.

The reinforcement of the outer shell increases the longitudinal and transverse strength of the polymer coating, and the use of a wire without the zinc coating in the quality of the armor of the cable reduces the value of m is materials. Filling a sealing material air gaps wires armor provides longitudinal sealing of the cable and prevents the emission of borehole fluid or gas through polivy armor, increases pushing efforts on geophysical instrument, provides protection of the armor wires of the cable.

The proposed cable design allows you to perform the full range of geophysical operations in wells, including logging, swabbing, perforating-explosive operations, etc.

Method for wells, including a high content of hydrogen sulfide and high wellhead pressure, includes descent by cable logging tools and equipment, while tripping operations are performed using geophysical cable with reinforced polymer shell.

Figures 1 and 3 shows the cable construction with a polymer shell made according to OST 153-39.1-005-00, where 1 is the one - or three-core cable core, respectively, 2 - duhovna armor cable, 4 - protective shell. Figure 2 and 4 show the construction of similar cables containing composition of the polymer membrane reinforcing elements 4.

The technology works in the wells with the proposed structures of identical cable technology application serial geophysical cables and are listed in the "Technical instructions for conducting geo is bodily research and work on the cable in oil and gas wells", Moscow, 2001, but it ensures the execution of works in mos wells and wells with high wellhead pressure at minimum cost.

1. Carrying geophysical cable with reinforced polymer shell containing one or more elektroizolyatsionnyh conductive wires having at least two powwow armor steel wire, allowing the presence of the intermediate shell and the outer shell of polymeric material, characterized in that the outer shell is reinforced with a mesh of steel wire, with unit cell dimensions in the longitudinal and transverse dimension equal to 1-10 diameters of wire.

2. The cable according to claim 1, characterized in that the cable armor and/or a reinforcing element polymer filler made of steel wire without zinc coating.

3. The cable according to claim 1, characterized in that the reinforcing material is applied polypropylene, polyamide, cotton or synthetic threads.

4. The cable according to claim 1, characterized in that the air gaps between the armor wires and/or reinforcing elements shell filled simoultaniously sealant, for example, tiolovam or silicone.

5. Method for wells, including a high content of hydrogen sulfide and high wellhead pressure, including descent by cable logging tools and equipment, otlichayushiesya, that lifting operations are performed using the logging cable with a reinforced polymeric membrane according to any one of claims 1 to 4.



 

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