Method and apparatus for providing contact of electric leads with casing column in multielectrode logging tool for electrical logging through metal column

FIELD: physics.

SUBSTANCE: electrodes are separately exposed to the impact of periodically accumulated potential energy of a spring, which is generated by rotating screw pairs and abrupt (impact) release of energy when screw interaction of crests of the screw pairs ceases. The apparatus for realising the method is a drive structure having an output shaft which actuates the screw pairs. During forward rotation, the screw pairs open centralisers and elastically press the electric leads to the wall of the well casing, apply periodic action on the electrodes that are rigidly connected to the electric leads. The electric leads are cut into the wall of the well casing. Impact action occurs when screw interaction between the screw and nut, which is pressed by a power spring, ceases.

EFFECT: improved electrical contact between electric leads and a casing column.

10 cl, 4 dwg

 

The invention relates to geophysical research well and can be used to determine the electrical resistivity of rocks surrounding a cased metal casing the well.

A known method of providing contact with electrical sensors casing in multielectrode downhole probe electric logs through the metal column in conditions of significant corrosion of the wall of the casing [1]. This method consists of the operations of the nominating electrical sensors, pressure to the borehole wall, periodic mechanical impact on the electrical sensors of the hydraulic actuator by successive multiple feed and discharge increasing pulse pressure. The effectiveness of the provision of electrical contact with the column in this way low. The time for which there is "pumped" (pressing the electrodes against the wall) is 20-30 seconds, the time of "release" (folding electrodes) is 1-5 seconds. Thus, the time period of exposure of the electrodes on the wall will be 21-35 seconds, which reduces the rate of logging. This is a very smooth effect on the electrical sensors, which is transmitted through an elastic medium (the entire working volume of the hydraulic fluid under working pressure). The pulses of fluid pressure generated by electromagnet the Ohm, may not have a significant impact on the process of making contact, since the amplitude of the pressure pulse may not be high due to the small ratio of the volume of injected fluid to all of the ratio of the volume of injected fluid to the entire volume of the working hydraulic fluid under working pressure. These pulses successfully extinguished not only in this volume, but also polymeric hoses and corrugations with a low elastic modulus, which are available in the drive. When this pulse energy is distributed according to Pascal's law on all the electrodes simultaneously. We can say that in this way ensuring contact with electrical sensors column occurs under static load than difficult cutting of solid deposits on the wall of the column to the base metal, is lost time to retry provide contacts the reduced speed logging.

The aim of the present invention is fast secure contact electrical sensors with the column and, consequently increasing the speed and quality of logs. For this purpose, the method including the operations of nomination, pressure, pulse mechanical impact on the electrical sensors (drive), all manipulations with electrical sensors produce a rotation of the screw, mechanical pulse in which the action is performed individually on each electrode of the shock with a sharp cutting electrical sensors in the casing wall.

Why periodically accumulate potential energy of the spring, then it is freed when the abrupt withdrawal of the screw engagement of the screw pairs of ridges. The specified sequence of operations and use of the listed features (tools) can significantly improve the quality of the contact electrical sensors with the column. Spring may have a work force of up to several hundred kilograms. In practice, as experience has shown, it is enough to have several tens of kilograms, so you can easily one hit hack unwanted deposits on the column. Periodic impact blows allows you to clean the contact zone from splinters and implement electrical sensors in the body of the column.

The figure shows a diagram explaining the essence of the method and device for its implementation.

As a prototype of the device selected clamping device electrical logging of cased wells [2].

This device consists of a housing, a drive output shaft, centralizers, electrodes. Each of the electrodes and centralizers are located along the axis of the device and are connected in series across the levers with the corresponding mechanism, which ensures their elastic clamped to the borehole wall. The mechanism has made coaxially with the shaft holder, the main spring, the screw and nut from the screw crests. Screw the imp is replaced directly on the shaft and is in screw engagement with a nut. The nut is made a groove which has a ferrule and a spring constantly clamped clip. The drive has a limit switch with a special mechanism for automatic shut-off actuator end positions.

The disadvantage of this device is the low efficiency of the electrical contact of the column electrodes, due to the presence of contaminated and corroded layer on the casing. This affects the quality of the materials during well logging. For reliable contact with the column have to spend special cleaning works well, involving special equipment and specialists, and this affects the increase in the price of works and time studies. In addition, this design can not be achieved in the operation of the return to the initial position of the centralizers and the electrodes due to the presence of complex structures at considerable length (the ratio of length to cross-section larger than 500) varying clearances due to wear and the elastic deformation of structural elements. There is also the complexity of their installation in the original (free position), it is associated with a range of dimensions within tolerances, when the total field tolerances may vary within wide limits, as well as with the relative polozenim screw. Such is the construction forces to enter into the design of all kinds adjust to eliminate gaps and output in the initial position individually each coil pair, that rather complicates the Assembly, adjustment and operation of this design. The situation is compounded if you screw pair will have different steps and strokes. A similar problem occurs in deviated and horizontal wells, we need to make an earlier disclosure of centralizers to cutting into the column of the electrical sensors then evenly pressed on the diameter of the hole and did not prevent transverse movement along the wall moving unit, overloading the drive. Poor clamped electrical sensors reduce the quality of logging.

The aim of the present invention is a secure contact with the test surface of the well and the automatic return to the original position of all centralizers and electrodes on the reverse of the output shaft regardless of the stroke, the relative position or step screw pairs, simplifying the design, process of Assembly and adjustment device.

This objective is achieved in that in a device consisting of a housing, a drive output shaft, multiple units and electrodes along the axis of the borehole, each of which is sequentially connected through levers with appropriate mechanisms, containing made coaxially with the shaft holder associated with the levers, springs, coil pair, includes screws and nuts with screw crests, ex is different, however, the shaft has three stops for each coil pair, between the first and second stops are placed in the holder, and between the second and third stops are placed screws and springs, screws and nuts progressive form pairs with the shaft and the housing, respectively, with the possibility of their release from helix interaction in opposite directions and the generation of shock loads ends of the spiral ridges, while ensuring their elastic preload springs.

The downhole device consists of a housing, an Electromechanical actuator output shaft driven centralizers and electrodes with electrical sensors that through the levers and mechanisms associated with the output shaft. 1 schematically depicts a portion of the downhole tool (drive not shown) where the electrode is a centralizer with electrical sensors, made in the form of rollers. The electrodes are connected with the output shaft through the mechanism. The upper levers 9 are connected with the housing 1 of the device, and the lower - yoke 8 with the axis 16. The levers 9 are interconnected axes 13, on which the electrodes 14 made in the form ostrozatochennymi rollers. The mechanism is a spring-loaded screw pair. The elements of the mechanism are located between the thrust rings 3, 4, 5. Rings 3 and 4 is made of elastic and is installed in the groove of the output shaft 2. The ring 5 is made of a hard and fixed on the shaft 2 pin is m 17. The levers 9 are closed, and the screw 6 is removed from the screw engagement with the nut 10 and is pressed by a spring 7 through the washer 12 and nut 10 against the plate 4, while the helical side surfaces of the crests of the screw 6 and the nut 10 are pressed together. The screw 6 by means of the groove 20 and the pins 15 forms with the shaft 2 progressive pair and the nut 10 by means of nuts 18 and groove 19 forms a translational couple with the housing 1.

The disclosure of the levers is as follows. The mechanism is in the closed position, figure 1. When the rotation shaft 2 and the associated screw 6, the coils of the crest of the nut 10 come into screw engagement with the turns of the crest of the screw 6, the nut 10 is moved upward. Upon further rotation of the shaft holder 8 together with the nut 10 begins to move upward relative to the housing 1. The levers 9 are disclosed. When pressure probes, centralizers or the electrodes reach the borehole wall, the nut 10 together with the yoke 8 will stop. When this screw 6 rotates, will begin to move down relative to the shaft 2, compressing the spring 7, until, until you exit the screw engagement with the nut 10. At this point, under the action of the spring 7, sharp out (step size) of the thread of the screw thread of the nut, i.e. there will be the hit of the screw 6 and nut 10. The shock of the screw 6 is transmitted through the nut 10, ferrule 8 and the lever 9 to the electrical sensors 14, which begin vigorously to penetrate the wall of the IC is ageny. Upon further rotation of the shaft and its associated screw, the shock will be repeated. When stopping the rotation of the shaft 2, the elastic action of a spring 7 is transmitted through the washer 12 with the yoke 8 through the screw 6 to the nut 10, the levers 9 of the centralizers and the electrodes, thereby providing elastic preload to the borehole wall. If the opening mechanism is outside of the well, for example, to test the operation of the device, the levers will be expanded up until the yoke 8 will not reach the ring 3 on the shaft, thus limiting the size of their maximum disclosure.

The closing of the levers is as follows. The mechanism is in the open position, as shown in figure 2. The levers of the mechanism disclosed prior to contact with the borehole wall, with the helical side surfaces of the crests of the screw 6 and nut 10 is pressed by a spring 7. When reversing the rotation of the shaft 2 and the associated screw 6, the screw under the action of the spring 7 will be tied up in the nut 10, moving up to the stop ring 4. Further reverse rotation of the shaft 2 and the associated screw 6 will cause the nut 10 will begin to move down and will engage the yoke 8 a. The levers 9 are closed. Further reverse rotation of the shaft 2 and the associated screw 6, the thread of the screw comes out of the screw engagement with the threaded nut 10 so putting all electrical sensors of centration will certainly happen with a small time difference without the use of devices with limit switches.

The device can have options. For example, for ease of Assembly, as shown in figure 3, the shaft stops installed for additional details representing the sleeve 21. The device can be configured with additional spring 11, as shown in figure 3, there is a need in the washer (12) (1, 2) disappears. Additional spring 11 may be installed as shown in figure 4, here the preload screw through the clip 22.

Screw crests of the screw and nut can be performed multiple. This improves alignment, reduces contact stress, improves durability, reduces the likelihood of jamming. To reduce friction and increase efficiency in the mechanisms of the device translational and rotational friction pair can be performed with the rolling bodies. For example, instead of the pins 7 can have the balls or rollers, and instead of washers 12 - thrust bearing.

Thus, unlike the prototype, the proposed construction of a downhole tool allows opening and closing managed probes, centralizers, electrodes without limit switches. In addition, coil pair can have different settings of the thread pitch and stroke. In mechanisms of centralizers, without cutting electrodes, it is advisable to have increased to at the time of disclosure, when the and the unit is on the inclined wall of the borehole, cutting electrodes does not cling to the wall and does not interfere with installation of the device along the axis of the borehole. Otherwise, it will change the measuring base, which will reduce the quality of the measurements. The opening/closing device will be determined by the mechanism with maximum uptime. In this case the wear of the axes and levers of the device will not change the secure fit of the levers to the device when closing mechanisms. Screw pair initially can be in any relative positions. At the first turning of the actuator in either direction, through the time corresponding to full opening/closing mechanisms, the elements of the device will be in one of the end positions. It also simplifies the Assembly and adjustment of the device, eliminates routine adjustment of a significant number of elements of the device when installing them in the initial position. Effective positive feature of the design is the ability to embed the electrodes of the shock through the steel casing, providing a reliable electrocontact regardless of undesirable deposits on the wall in the form of asphalt, paraffin wax, oxides of iron, cement, sand, clay, etc. This ensures the accuracy and reliability of information. The positive qualities of the new design of the downhole tool were achieved by simplification of the design is, due to the properties included in the characterizing part of the claims.

Fashion and design is tested in downhole conditions. The results obtained materials show high quality and increase the speed of the logging operation is demonstrated reliability, manufacturability, maintainability. Preparing the release party of electrical logging of cased wells, corresponding to this invention.

Sources of information

1. Method and device electrical logging a cased wellbore EN 2306582, 21.11.2005.

2. Device electrical logging of cased wells, EN 2361245, 19.02.2008.

1. The way to ensure contact of the electrical sensors multielectrode probe electric logs through the metal column in conditions of significant corrosion of the casing walls and the presence of the cement, waxes, resins, in which forward and pressed against the wall of the electrical sensors, produced by a pulsed mechanical effect, characterized in that all manipulations with electrical sensors produce a rotation of the screw, pulse mechanical effect produced individually shock on each electrode with a sharpened cutting electrical sensors in the casing wall, for which energy is periodically accumulate in the potential energy of the springs, and then jump (shock) release is the Nergy when exiting helix interaction pairs screw crests.

2. The method according to claim 1, characterized in that the bumps on the electrodes produced sequentially by a relative reversal of the ends of the crests of the screw.

3. The device providing the contact pointed multielectrode electrical sensors downhole probe electric logs through the metal column in conditions of significant corrosion of the wall of the casing and having therein cement, waxes, resins, consisting of a body, a drive output shaft, multiple pressure probes, managed centralizers, electrodes, each of which is serially connected through levers with appropriate mechanisms, containing made coaxially with the shaft holder associated with the levers, springs, coil pair, includes screws and nuts with screw flanges, characterized in that the shaft has three stops for each coil pair, between the first and the second emphasises posted by clip, and between the second and third stops are placed screws and springs, screws and nuts progressive form pairs with the shaft and the housing, respectively, with the possibility of their release from helix interaction in opposite directions and the generation of shock loads ends of the spiral ridges, while ensuring their elastic preload springs.

4. The device according to claim 3, characterized in that the actuator mechanisms are available without cutting electrode is in, made with increased step screw relative to the actuators associated with cutting electrodes.

5. The device according to claim 3, characterized in that the stops made in the form of retaining rings.

6. The device according to claim 3, characterized in that the mechanism we have introduced sleeve encompassing the shaft is rigidly connected with it, and the transfer stops the shaft.

7. The device according to claim 3, characterized in that the translational provided with a pair of rolling elements.

8. The device according to claim 3, characterized in that the helical ridges nuts and screws made multiple.

9. The device according to claim 3, characterized in that coaxially with the shaft in the mechanisms introduced an additional spring providing an elastic preload nuts to the screws when the lever is closed).

10. The device according to claim 3, characterized in that clip and nuts are a single item.



 

Same patents:

FIELD: electrical engineering.

SUBSTANCE: device includes a ground-based part and a downhole device with a multielectrode probe. The ground-based part consists of an on-board computer, a switching unit, an interface unit, a logging winch, a depth unit and the probe power supply as well as electrodes B and Nud. The probe is represented by a group of five or more electrode packages serially arranged along the well axis. Positioned within the end packages of the electrodes group are current electrodes A1 and A2. The other electrode packages within the group are measuring ones (M1…Mn). The probe power points can be pressed to the column walls with the help of the electric drive with clamping mechanisms and penetrate into the column body with the help of in-built impact mechanisms. The downhole device includes a gamma logging unit, a collar locator and an accelerometer. With the help of the accelerometer, one controls the impact mechanisms operation quality. The switching unit enables the opportunity to transmit current between the current electrodes A1 and A2 and to power electrodes A1 and A2 relative to electrode B in three measurement cycles. Based on digitised results of the three measurement cycles, one determines specific electric resistance from the formula accounting for, among other things, the casing column diameter and.

EFFECT: formation resistivity.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention can be used during evaluation of current oil and gas saturation of a formation by applying the resistivity determining method. The above method involves determination of resistivity of the open shaft medium as per the lateral logging (LL) data using standard dependence, according to which and unlike known methods, lateral logging is performed after the open shaft of the well is filled with mineralised solution having the composition identical to the composition of drilling mud used at drilling of that well. Resistivity of casing string is accepted equal to such resistivity of drilling mud, at which evaluation of resistivity of dense rocks turns out to be equal to resistivity of those rocks as per the open well shaft data. Resistivity of the formation is calculated by adding the specified resistivity value of drilling mud to the following formula: where: pk- apparent resistivity of the string as per LL-3, Ohm·m; pc - drilling mud resistivity, Ohm·m; pn - formation resistivity, Ohm·m; L - probe length, m; d - well diameter, mm; d3 - probe diameter, mm.

EFFECT: improving the sounding data accuracy.

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FIELD: physics.

SUBSTANCE: invention relates to well logging and can be used to determine electrical resistance of rock formations surrounding a well cased by a metal column. First and second potential differences are determined using combined measurements of two devices for measuring small quantities which measure voltage drop between neighbouring electrodes of a set of three equidistant measuring electrodes. When determining resistance of a section of a column, non-uniformity of flow of currents transmitted to current electrodes upwards and downwards the column is taken into account.

EFFECT: suppressing the dependency of the measured resistivity of rock formations from systematic multiplicative error of the devices for measuring small quantities, high quality and reliability of measurements.

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EFFECT: non-sensitivity to bed inclination angle in unfocused instrument when using drilling fluid on hydrocarbon base.

18 cl, 4 dwg

FIELD: oil and gas production.

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EFFECT: increased speed of logging survey, and expanded range of measurements.

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EFFECT: increase of recording speed, reduction of interferences, increase of differential-input range.

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FIELD: oil and gas production.

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EFFECT: upgraded accuracy of measurements and reliability of their execution, automatic record of well influence.

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FIELD: physics; geophysics.

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EFFECT: increased accuracy, wider range of measurements.

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FIELD: physics; geophysics.

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EFFECT: wider dynamic range for determining true electrical resistivity with error of 5%.

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FIELD: oil and gas industry.

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FIELD: oil and gas industry.

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EFFECT: improving reliability and efficiency of the plant.

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FIELD: oil and gas industry.

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EFFECT: improvement of the device operational reliability and simplification of the device.

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FIELD: oil and gas industry.

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EFFECT: increase of operational efficiency during installation of the bottom-hole complex, improvement of level of detail and authenticity of GIS data for identification of geological rating for rock masses.

1 tbl

FIELD: oil and gas industry.

SUBSTANCE: down-hole testing and measuring complex includes earth control station with telemetric data system connected by a logging cable with submerged-type electric pump at the end of tubing string, system of measuring modules including sensors for recording of parameters (yield, pressure, temperature, moisture content) and driving machine for their delivery to horizontal section of a well connected by a logging cable that provides rigid mounting for the system of measuring modules and transfer of data to the control station. Logging cables of the system of measuring modules telemetric system unit are connected by cable connectors. Driving machine contains two walking modules connected electrically and further driven by electrical micro-drives and sequential movement of wedged supports. Installation of the down-hole testing and measuring complex is performed in two stages. At first system of measuring modules is lowered to a well by means of winch with survey cable connected by a cable connector with a logging cable of the system of measuring modules passing through a groove in the wall of an installation pipe mounted at the well surface at the end of tubing string and by the other butt end - to the deadman in which tube there is a movable logging cable. The system of measuring modules is lowered at first up to driving machine turning to a relatively horizontal section, then by means of the driving machine it is hold to the relatively horizontal section until cable connector seats in the deadman tube; the latter is lowered by means of the installation pipe to the preset depth and fixed on the well bore. Thereafter power supply is switched odd in the micro-drive, by means of the winch socket with the survey cable is disconnected from connector pin and the installation pipe is lifted to the surface. At the second stage submerged-type electric pump is lowered to the well with logging cable and socket of cable connector contact pair filled by liquid sealant which is by means of a centring skid connected to the logging cable for the system of measuring modules.

EFFECT: increase of operational efficiency during installation of the bottom-hole complex.

6 cl, 5 dwg

FIELD: oil and gas industry.

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EFFECT: increase of reliability and operational efficiency, determination of productivity in the process of well drilling.

FIELD: oil and gas industry.

SUBSTANCE: load is measured in the well location during the well operation; at that, load measurement involves load measurement by means of a subassembly attached to layout of the drilling string bottom. Load data is transferred to surface in real time mode by means of telemetry; load data is evaluated with a control device located on the surface; and corrective action in the well, which is based on the load data, is taken.

EFFECT: improving reliability and quality of analysis of measured load.

18 cl, 10 dwg

FIELD: oil and gas industry.

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EFFECT: use of produced gas during survey of gas wells for generation of electric power.

FIELD: mining.

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EFFECT: improving objectivity of evaluation of production capabilities of wells and composition of the field fluid transported via pipes.

2 cl, 3 dwg

FIELD: oil and gas industry.

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EFFECT: possibility of obtaining operational information on properties of productivity of a horizontal shaft in real time during the well operation.

1 dwg

FIELD: mining industry.

SUBSTANCE: invention can be used in case of gas-lift operation of wells equipped by free piston-type installations. Invention envisages stopping well, connecting tube space and annular space in wellhead, recording bottom zone and wellhead pressures in tube and annular spaces, and computing well operation parameters using inflow curve plotted according to differences of bottom zone and wellhead pressures. Volume of produced fluid is found from potential output of formation and from condition of output of free piston. When comparing these volumes, parameters of well are computed in the base of minimum volume value.

EFFECT: optimized well operation.

2 dwg

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