Electromagnetic well defect detector

FIELD: geophysics.

SUBSTANCE: device has non-magnetic body, electronic block, longitudinal and transverse probes with inductive coils, each of which has generator and receiver windings, while transverse probe has no less than three inductive coils, positioned along perimeter of central ferromagnetic core.

EFFECT: higher efficiency.

4 dwg

 

The invention relates to geophysical studies in the wells and can be used to control the technical condition of operational and technical columns, tubing in oil wells and gas fields.

A device for fixing the coupling of the casing along its length, as well as determine the size of these couplings, including the generator and the measuring coil inductance, electromagnetic pulse generator, wireline and registration apparatus (U.S. patent No. 4736298, CL G 01 V 1/40, 1986). The disadvantage of this device is the low sensitivity to defects of small length along the axis of the device.

Also known equipment electromagnetic flaw detection and thickness gauging, based on the study of vortex electromagnetic field generated by the generator coil inductance through which pass alternating pauses the current pulses. The coil is placed inside the system casing and tubing. Characteristics of this field depend on the pipe wall thickness, pipe diameter, and the device used probe (patent RF № 2074314, M CL E 21 In 47/00, 47/12, 1996).

Used in the specified equipment longitudinal probes allow gauging and inspection of one - and two-column structures wells. But longitudinal probes solve C the villas measure the thickness of the pipe and detect longitudinal defects (along the axis of the borehole). At the same time, the task of detection of transverse defects, they do not solve.

The closest to the technical nature of the claimed invention is a multi-array digital electromagnetic flaw detector-meter, which was developed in VNIIGIS and implemented modifications EMDS (AccessPlugin, Avellar, Vasiliou. Multielectrode digital electromagnetic flaw detector-tester //New geophysical technique for exploration drilling and operating vertical, inclined and horizontal wells: abstracts of the international Symposium, Ufa, April 23-24, 1997. - P.29-30). In the downhole tool contains a group of probes with different orientation of the coil relative to the axis of the probe. This allows us to identify defects fracture type any direction.

Used in the prototype transverse probe (Figure 1) has two centrally located coils 1 and 2, the axis of which is perpendicular to the axis of the casing 3 and orthogonal to each other. At a symmetric location of the device relative to the front and rear casing walls 4A, 4B (2) the magnetic field lines 5 are arranged as symmetrically as shown in figure 2 for a single winding 2 in the slit pipe 4. The transverse probe is well positioned transverse defects of pipes. Figure 2 shows a single coil in the section of pipe and location C the new lines of the magnetic field. However, the transverse probes used in this instrument, have several disadvantages:

1. When the misalignment of the instrument or the appearance of the defect field becomes asymmetrical. As each winding feels “front” and “rear” wall pipe, the interpretation of the results becomes difficult. Figure 3 shows the effect of a change in the magnetic field when the misalignment of the instrument or the appearance of the defect.

2. The result of the measurement strongly depends on the position of the windings relative to the defect. When you record, when the device is turned and the position of the transverse windings of the transmitter with respect to the defect has changed, the result is not repeated.

The present invention will greatly facilitate the interpretation of the obtained information, as it eliminates the mixing of the signals from the “front” and “rear” wall pipe, and each of the windings of the transverse probe only works with their sector of the measured column. When you record the rotation of the device will only lead to transition anomalies from defect in another sector that is easy to read.

To solve this problem in the proposed electromagnetic borehole detector containing non-magnetic case, the electronic unit, the longitudinal and transverse probes with inductance coils, each of which includes a generator and a receiving coil, to facilitate detection of the interpretation of the defects, improve resolution of the apparatus, the transverse probe has at least three coils spaced around the perimeter of the Central ferromagnetic core.

Figure 4 shows the cross section of the proposed transverse probe, which uses 4 coils. To exclude the influence of the “back” sides of the tube, between the coils 6, 7, 8, 9 has a ferromagnetic core 10 that serves as a screen. The result is a probe with 4 coils, each of which is responsible for its own sector of the pipe surface. Each of the coils 6, 7, 8, 9 includes two windings: a generator, which is wound with thick wire to pass a large current, and receiving, with a significantly large number of coils, wound with thin wire. With its help, based on the transformer effect of the signal generating winding is amplified to feed the input of the measuring circuit, which allows to improve the ratio signal/noise. Such arrangement of the coils allows you to bring them to the pipe wall.

The choice of the number of coils is determined by the conditions of use of the instrument, namely its diameter. In the development of equipment of small diameter (36, 42, 45 mm) using the minimum number of coils sufficient to determine the position of the probe in the pipe - 3 PCs for hardware development of large diameter the number of coils can be increased, and it becomes possible to measure a larger number of sectors.

The detector operates in the following sequence. Alternator windings skipped a pulse of current that arises in the study column eddy currents. The recording is done at the end of the boost current pulse, in the braking mode. Received in the receiving windings signals are in the form of exponential decay and carry information as to the distance from the coil to the casing walls, and on the characteristics of the column.

During movement through the borehole in the zone of defects, such as cracks, perforations, corrosion ulcers, in each sector there is a specific picture. Comparing measurements with different sectors, you can select typical cases:

anomaly in one of the sectors (asymmetric defect);

the same anomalies in all sectors (symmetric defect, groove, break, clutch, change the pipe diameter);

- anomalies in all sectors, different (the misalignment of the instrument).

Measurements using the proposed detector allow to determine the position of the device in the casing and to amend the longitudinal dimension of the probe, which is responsible for gauging. As a result of application of the proposed detector there is a new quality dimension, which allows us to detect and qualifizierte the ü defects. In addition, it becomes possible to detect defects smaller, inaccessible to equipment with conventional probes.

Electromagnetic borehole detector containing non-magnetic case, the electronic unit, the longitudinal and transverse probes with inductance coils, each of which includes a generator and a receiving coil, wherein the transverse probe has at least three coils spaced around the perimeter of the Central ferromagnetic core.



 

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Device for sampling // 2242607
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