Seal assembly for electrical logging probe

FIELD: physics.

SUBSTANCE: disclosed is a seal assembly for an electrical logging probe, having a cylindrical housing, a plurality of dielectric inserts placed in the housing, a plurality of annular electrodes coaxially placed in the housing between the dielectric inserts and touching the end faces of the dielectric inserts with their end faces, an insulating means placed on the cylindrical housing for electrical insulation of the plurality of annular electrodes from the housing. According to the invention, each of the plurality of annular electrodes and dielectric inserts in contact with the annular electrodes have bevel end faces. The bevel end faces of the electrodes are interfaced with the bevel end faces of the dielectric inserts that are in contact with them. The seal assembly has a means of generating a compression force and fixing, which is in contact with the end face of the dielectric insert, placed distally with respect to said dielectric insert which is in contact with the cylindrical housing.

EFFECT: high containment of electric equipment of the probe from the external medium of the well and improved probing data.

12 cl, 5 dwg

 

The technical field

The present invention relates to equipment for well testing, in particular to probes for electrical well logging, and more particularly, to the sealing site of the probe, ensuring the integrity of electrical equipment placed in the probe housing from the external environment of the well.

Prior art

Studies of rocks high resistance (for example, carbonate and hydrochemical deposition) on the results of measurements ρtoconventional probes significantly affected by salt washing fluid, which facilitates the distribution of electric current along well, and this leads to a strong smoothing of the curves ρto.They are not in connection with on-screen effects layers of small thickness with frequent alternation.

In such conditions apply lateral logging, which is one of the modifications of the method of measuring resistance. When ρtoin the well is measured three-, seven - and deviceelectrode probes.

The most common three-electrode-side logging (figure 1). Side three-electrode probe consists of a Central electrode And0length lmmetal part which is 0.15 m, and two display electrodes And1and a2same length, balanced is a rule located relative to And 0and separated from it by an insulating gaps b, components of 0.03 m All the electrodes have the form of cylinders with a diameter of dC=0,07 m, the size of the probe L is 3.2 meters (the distance between the upper and lower ends of the probe). The shielding electrodes are interconnected short-circuited with the electrode And0they are connected through a resistor (shunt) RW=0.01 Ohm, which is also used to measure current through the Central electrode And0. Through all the electrodes of the probe from the generator G is skipped alternating current.

A second current electrode, which closes the power supply circuit, is braid armored cable. Since the shunt RWhas a very small resistance, the potentials of all electrodes will be almost identical, and therefore the current I0electrode And0does not spread through the borehole and extends perpendicular to the wall, as shown in figure 1 in the form of a nearly horizontal power lines, the thickness of which in the Central part is approximately equal to the length And0. As a consequence, the influence of the borehole and surrounding rocks is manifested in the results of measuring the resistance ρtosignificantly less than conventional probes.

The measured resistance ρtois determined by the voltage between the display electrodes and is equal to the voltage between the electrode And0poskolkuutvarey all of the electrodes are the same, and the remote electrode Nlocated on the multielectrode probe.

There are known various devices for sealing the electrode site of a logging probe.

The closest in technical essence to the present invention is a seal Assembly (figure 2) probe for electric logs, described in the publication, Y.M., Zaworotko "Physical principles of geophysical methods of exploration", Kyiv, 2010.

Known sealing unit probe for electric logs comprises a cylindrical housing, many of dielectric bushings installed on the housing, a lot of the annular electrode is coaxially placed on the housing between the dielectric sleeve and the contacting end surfaces of the end surfaces of the dielectric spacers, the insulating means, placed on the cylindrical housing for electrical isolation of multiple ring-shaped electrode from the housing. Extreme dielectric sleeve contact of the end surface of the cylindrical body. Each of the multiple annular electrodes and a dielectric sleeve in contact with the annular electrodes have end faces perpendicular to the axis of the probe. There are sealing means placed in grooves made on the surfaces of the electrodes, education is connected to the chassis.

The disadvantage closest technical solution is insufficient provide sealing, and the complexity of Assembly/disassembly during operation of the probe in the well.

The invention

The purpose of this invention is to provide a sealing unit probe for electric logs, which will provide improved sealing of the probe logging device, as well as provide easier Assembly/disassembly of the node.

The present invention is to create a probe for electric logs containing the above-described seal Assembly. The specified probe that uses the declared seal Assembly is intended for research methods standard electric logs, side logging sensing using three or more electrodes.

The problem is solved by creating a sealing unit probe for electric logs containing cylindrical body, many of dielectric bushings installed on the housing, a lot of the annular electrode is coaxially placed on the housing between the dielectric sleeve and in contact with their end surfaces of the end surfaces of the dielectric spacers, the insulating means, placed on the cylindrical is abuse for electrical isolation of multiple ring-shaped electrodes from the housing, according to the invention,

one of the dielectric bushing contacts the end surface of the cylindrical body,

each of the multiple annular electrodes and a dielectric sleeve in contact with the annular electrodes are beveled end surface, and a beveled end surface electrodes interfaced with a beveled end surfaces in contact with the dielectric bushings

when this seal Assembly includes a tool for creating the effort of pressing and fixing in contact with the end surface of the dielectric sleeve, placed distal of the specified dielectric sleeve in contact with the cylindrical body, and is intended to prevent axial movements of the ring electrodes and the dielectric collet relative to the body,

sealing means placed in grooves made in the end surfaces of the electrodes, while

above the holes formed in the cylindrical housing, the insulation layer is absent.

Preferably the acute angle of the end surface of each annular electrode and the dielectric sleeve relative to the longitudinal axis of the housing is in the range from 20 to 40°.

Preferably, the insulating means is made in the form of a tube of diele the electrical material.

Preferably, as the dielectric material was used fiberglass laminate.

Preferably, the portion of the cylindrical body, which has plenty of ring electrodes and the dielectric sleeve, had reduced diameter with the formation of the annular ledge, the end surface which is in contact with the end surface of the specified one of the dielectric sleeves.

Preferably, the means for creating the effort preload and fixation was performed in the form of a nut, the end surface in contact with the end surface of the distal dielectric sleeve.

Preferably, seal Assembly contained sealing means placed in grooves made on the surface of the chassis end of the dielectric sleeve, and sealing means are in the form of rubber rings.

Preferably in the specified o node electrode is a radiating element or the measuring element.

Preferably the dielectric sleeve is made of polymeric material polyetheretherketone glass fibre reinforced with 30% glass from the total volume of the product (PEEK).

The problem is solved also by creating a probe for electrical logging, which is characterized in that it contains uplo the additional node, performed as described above.

The proposed sealing unit probe for electric logs will help to eliminate mechanical stresses on the device external pressure wells. These loads greatly exceed the loads that occur during operation of the device (compression, tension and bending).

In the proposed design of the sealing unit of the probe by performing end-faces a multitude of ring-shaped electrodes and the end surfaces of the dielectric bushing in contact with the annular electrodes, mating beveled and provided the possibility of realization of the device without system pressure compensation hole.

In the specified probe all elements of the measuring electronics are sealed volume impacted by external hydraulic pressure. Probe part can be considered as the electronic unit logging tool having a casing, perceiving mechanical loads caused by external pressure in the well, and loads occurring during operation, i.e. tension/compression and bending the chassis.

The claimed design does not require the use of expensive technological equipment to maintain the device in working condition, i.e. settings to create a vacuum and oil filtration, oil filling in the device is on, does not require special facilities for carrying out these activities, the premises must only meet the fire safety requirements and does not require specially trained personnel and expensive consumables (special oil).

Brief description of drawings

The invention is further explained in the description of the preferred variants of the embodiment with reference to the accompanying drawings, in which:

figure 1 depicts the current distribution of power lines of the three-electrode probe lateral logging;

figure 2 depicts a known seal Assembly of the probe, according to the prior art;

figure 3 depicts a probe for electrical side logging (longitudinal section), according to the invention;

figure 4 depicts the seal Assembly of the probe (longitudinal section), according to the invention;

figure 5 depicts a portion of the probe for the electrical side logging (longitudinal section), contains many of sealing units, according to the invention.

Description of the preferred embodiment variants of the invention

Figure 3 shows a longitudinal section of a probe containing a sealing unit 1 according to the present invention. The probe comprises a cylindrical housing 2, on which is coaxially installed lots of ring-shaped electrodes 3 and many of dielectric bushings 4, moreover, the ring-shaped electrodes 3 placed between dielectric bushings 4 and in contact with their end surfaces 5 with the end surfaces 6 of the dielectric sleeves.

For electrical isolation of multiple ring-shaped electrodes 3 from the housing 2 to the cylindrical housing 2 posted by insulating means 7 (figure 4), which is made in the form of a tube of dielectric material. As the dielectric material used fiberglass laminate.

End surface of the set ring-shaped electrodes 3 and many of dielectric bushings 4 are beveled, which provides a better fit end surface of the electrode 5 to the end surface 6 of the sleeve.

Due to the fact that the contacting surfaces of the electrodes 3 and sleeves 4 are beveled, provides tight coupling of these surfaces. When the Assembly under the action of pressure F1 (5) the beveled surface 5 of the ring electrode 3 is pressed against the beveled surface 6 insulating sleeve 4, and thus provides a good seal.

Preferably, the acute angle of the end surface 5 of each annular electrode 3 and the end surface 6 of the dielectric sleeve 4 relative to the longitudinal axis of the housing 2 is in the range from 20 to 40°.

Figure 4 shows an example in which the probe contains two electrodes 3 and two dielectric sleeve 4, however, it is possible that the node contains an even number of ring electrodes and an odd number of dielectric bushings (figure 5) or n is turnover.

Seal Assembly includes a tool 8 creation efforts preload and fixing in contact with the end surface 9 of the dielectric sleeve 4A, placed distal of the dielectric sleeve 4b in contact with the cylindrical body 2, and is designed to prevent axial movements of the ring electrode 3 and dielectric bushings 4 relative to the housing 2. As a means of 8 creation efforts preload and fixation can be used nut, which provides reinforcement and the preload ring electrode 3 and dielectric bushings 4. End surface of the nut contacts the end surface 9 of the distal dielectric sleeve 3A.

In the recesses 10 (figure 4)made in the end surface 5 of the ring electrode 3 is placed a sealing means 11.

Over holes 12 made in the cylindrical housing 2, a layer of dielectric material (insulation) is missing. Holes 12 are for the node 13 electrical connections of the electrode.

In the described embodiment, the embodiment of the portion of the cylindrical body 2, which has plenty of ring electrodes 3 and the dielectric sleeve 4 has a reduced diameter with the formation of the annular ledge 14, the end surface 15 of the ledge 14 is in contact with the end surface 16 dielectr the cooling sleeve 4b, adjacent to the housing 2.

On the surfaces of the electrodes 3 in contact with the insulating tube 7, the recess 17 in which is placed a sealing means 18, in this case representing a rubber ring.

On the surface of the housing 1 under the integral dielectric sleeves 4A and 4b made of the recess 19 in which is placed a sealing means 20, which are also made in the form of rubber rings.

The annular electrode 2 is emitting or measuring element.

The dielectric sleeve 3 is made of a polymeric material PEEK of polyetheretherketone glass fibre reinforced with 30% glass from the total volume of the product. In the manufacture of dielectric bushings and glass filled polymer powder in the form of "dust", after which there is a casting under pressure and at high temperature.

O-ring 11b 20 cover any potential gaps and protect the site of the probe from the penetration of the external environment.

Probe for electric logs contains the seal Assembly described above.

The proposed option of carrying out the invention is not restrictive.

1. Sealing unit probe for electric logs containing cylindrical body, many of dielectric bushings installed on the body, lots of ring-shaped electrodes, Koa is ciolino placed on the housing between the dielectric sleeve and in contact with their end surfaces of the end surfaces of the dielectric bushings insulating means, placed on the cylindrical housing for electrical isolation of multiple ring-shaped electrodes from the housing, wherein one of the dielectric bushing contacts the end surface of the cylindrical body, each of the multiple annular electrodes and a dielectric sleeve in contact with the annular electrodes are beveled end surface, and a beveled end surface electrodes interfaced with a beveled end surfaces in contact with the dielectric bushings, thus sealing unit contains a tool for creating the effort of pressing and fixing in contact with the end surface of the dielectric sleeve, placed distal of the specified dielectric sleeve in contact with the cylindrical housing, and designed to prevent axial movements of the ring electrodes and the dielectric bushing relative to the housing, sealing means placed in grooves made in the end surface of the ring electrode, while over the holes formed in the cylindrical housing, the insulation layer is absent.

2. Seal Assembly according to claim 1, characterized in that the acute angle of the end surface of each annular electrode and the dielectric is tulki relative to the longitudinal axis of the housing is in the range from 20° to 40°.

3. Seal Assembly according to claim 1, wherein the insulating means is made in the form of a tube of dielectric material.

4. Seal Assembly according to claim 3, characterized in that the dielectric material used fiberglass laminate.

5. Seal Assembly according to claim 1, characterized in that the portion of the cylindrical body, which has plenty of ring electrodes and the dielectric sleeve has a reduced diameter with the formation of the annular ledge, the end surface which is in contact with the end surface adjacent to the body of the dielectric sleeve.

6. Seal Assembly according to claim 1, characterized in that the means for creating the effort preload and fixation made in the form of nuts, the end surface in contact with the end surface of the distal dielectric sleeve.

7. Seal Assembly according to claim 1, characterized in that it contains sealing means placed in grooves made on the surface of the chassis end of the dielectric sleeve.

8. Seal Assembly according to claim 1 or 7, characterized in that the sealing means made in the form of rubber rings.

9. Seal Assembly according to claim 1, characterized in that the annular electrode is radiating or measuring element.

10. Seal Assembly according to claim 1, characterized those who, that the dielectric sleeve is made of a polymeric material PEEK of polyetheretherketone glass fibre reinforced with 30% glass from the total volume of the product, the glass is filled into the powder in the form of "dust", after which there is a casting under pressure and at high temperature.

11. Probe for electric logs, characterized in that it contains seal Assembly according to claims 1-10.



 

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