CN201090208Y - Well logger for independent arm hole diameter imaging - Google Patents

Abstract

Disclosed is an independent arm well diameter imaging well logger, which mainly solves problems of low precision, bad stability and a few given log curves of the current contact type well diameter imaging well logger. The utility model is characterized in that: a differential displacement transformer is adopted as a displacement sensor, each measuring arm (17) is combined with a transmission leg (14), a spring II (15), a spring I (12), a measuring magnetic needle (11), a probe core (10) and the differential displacement transformer to act as a measuring unit, and a plurality of similar measuring units are fixed in a protecting tube (16) by fixed rings, and the pressure signal output end of the differential displacement transformer is connected to the electric signal input end of a circuit tube (3). The well logger has advantages of high measuring precision and good stability, and adopts a plurality of independent measuring arms to measure the inside diameter of the oil well casing, thereby acquiring a plurality of well diameter curves and getting rather accurate well-logging interpreting results. In addition, the utility model has a compact structure and is convenient for maintenance and measuring the casing with smaller diameter.

Description

Independent Arm Caliper Imaging Logging Tool

Technical field:

The utility model relates to a logging device, in particular to a contact mechanical logging device.

Background technique:

At present, there are mainly two types of caliper imaging logging tools at home and abroad: non-contact and contact. Non-contact logging tools, one is an electromagnetic flaw detection logging tool that uses electromagnetic principles. Its advantage is that the outer diameter of the tool is small, which can effectively reduce the impact of environmental factors; the disadvantage is that data interpretation is more difficult. The other is the ultrasonic TV logging tool which uses the ultrasonic principle. The advantage is that the measurement results are intuitive, but the disadvantage is that the measurement results are greatly affected by environmental factors. The common advantage of contact caliper logging instrument products is that it can minimize the impact of the test environment on the measurement results, easy to interpret data, and intuitive result graphs. However, the existing contact type caliper measuring instruments all use rod potentiometers as displacement sensors, which have poor precision and low stability. In addition, the caliper curves that can be given are very few, which is very unfavorable for obtaining accurate logging interpretation results. For example, the micro-caliper measuring instrument that appeared earlier in China can only give one caliper curve, the X-Y caliper can give two caliper curves, and the eight-arm caliper can give four caliper curves.

Utility model content:

In order to solve the problems of low precision, poor stability and few logging curves of the existing contact caliper imaging logging tools, the utility model provides an independent arm caliper imaging logging tool. The caliper imaging logging tool uses a differential displacement transformer as a displacement sensor to improve the measurement accuracy and stability, and uses multiple independent measuring arms to measure the inner radius of the oil well casing, and can obtain multiple caliper curves, which can obtain accurate The characteristics of the log interpretation results.

The technical scheme of the utility model is: this kind of independent arm caliper imaging logging instrument, including instrument head, upper centralizer, circuit barrel, sensor assembly, measurement transmission assembly, lower centralizer and tail cap, these overall structures are consistent with Existing contact type calipers are basically the same, but have the following improvements: the sensor assembly is composed of sequentially connected probe jackets, sealing joints, probe cores, measuring magnetic needles, springs 1 and evenly distributed on a circumferential plane and It is composed of a plurality of differential displacement transformers installed on the probe core in the sealed joint, wherein the differential displacement transformers are used as displacement sensors, and the angle between every two differential displacement transformers is equal, and each measuring magnetic needle is equipped with a sealed " O" ring. The measurement transmission assembly is composed of a fixed ring, a transmission leg, a spring II, a protective tube, a measuring arm, and a measuring arm seat, wherein the protective tube is connected with the sealing joint in the sensor assembly, and an annular cavity is formed between the two. The fixed ring in the cavity is fixed at the lower part of the sealing joint. After passing through the fixed ring, the upper and lower sections of the transmission leg are respectively pressed by spring I and spring II. In the groove, the top is connected with the measuring magnetic needle, which can drive the measuring magnetic needle to move vertically. The head of each measuring arm is fixed on a rotating connection point on the measuring arm base, and its tail is "L" shaped, protruding from the outer wall of the casing. Each of the above-mentioned measuring arms constitutes a measuring unit with a driving leg, spring II, spring I, a measuring magnetic needle, a probe core and a differential displacement transformer, and the pressure signal output terminal of the differential displacement transformer is connected to the circuit cylinder electrical signal input terminal.

The utility model has the following beneficial effects: firstly, the solution improves the displacement sensor used in the prior art, that is, the original rod-type potentiometer is replaced by a differential displacement transformer, thereby improving measurement accuracy and stability. In addition, this solution provides a new set of power transmission machinery, using multiple independent measuring arms to measure the inner diameter of the oil well casing, so that the logging tool can not only realize the output of multiple logging curves, but also has a compact mechanical structure, It has the characteristics of reliable transmission, small outer diameter and convenient maintenance.

Description of drawings:

Fig. 1 is a schematic composition diagram of the utility model.

Fig. 2 is a structural cross-sectional view of the sensor assembly and the measurement transmission assembly in the utility model after being connected.

In the figure 1-instrument head, 2-upper centralizer, 3-circuit barrel, 4-sensor assembly, 5-measurement transmission assembly, 6-lower centralizer, 7-tail cap, 8-probe jacket, 9-sealing Connector, 10-probe core, 11-measuring magnetic needle, 12-spring I, 13-fixing ring, 14-transmission leg, 15-spring, 16-casing, 17-measuring arm, 18-measuring arm seat, 19-ratio logging wall.

Detailed ways:

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Figure 1, this independent arm caliper imaging logging tool includes an instrument head 1, an upper centralizer 2, a circuit barrel 3, a sensor assembly 4, a measurement transmission assembly 5, a lower centralizer 6 and a tail cap 7 , these overall structures are basically the same as the existing contact calipers, and will not be further described. The following two main improvements are specifically described:

The first point of improvement is the improvement of the displacement sensor. As shown in Figure 2, the sensor assembly 4 is composed of the probe jacket 8 connected in sequence, the sealing joint 9, the probe core 10, the measuring magnetic needle 11, the spring 1, and the probe core 10 which is evenly distributed on a circumferential plane and installed in the sealing joint 9. It is composed of a plurality of differential displacement transformers, wherein the differential displacement transformers are used as displacement sensors, and the included angle between every two differential displacement transformers is equal. A sealing "O" ring is installed on each measuring magnetic needle 11, and its function is to isolate high pressure and protect the sensor from being corroded by the liquid in the well.

The second improvement point is that the measurement transmission assembly 5 is made up of a fixed ring 13, a transmission leg 14, a spring II, a protective tube 16, a measuring arm 17, and a measuring arm seat 18, wherein the protective tube 16 is connected with the sensor assembly 4 The sealing joints 9 are connected, and an annular cavity is formed between them. The fixed ring 13 in the cavity is fixed on the lower part of the sealing joint 9. After the transmission leg 14 passes through the fixed ring 13, the upper and lower sections are respectively compressed by the spring I and the spring II, and the claws at the bottom are placed in the measuring In the arc-shaped groove of the arm 17, the top is connected with the measuring magnetic needle 11, which can drive the measuring magnetic needle 11 to move vertically. L" shape protrudes from the outer wall of the casing 16, so that the measuring arm 17 can be tightly attached to the inner wall of the casing by the force support of the spring.

Each of the above measuring arms 17 forms a measuring unit with a transmission leg 14, spring II, spring I, a measuring magnetic needle 11, a probe core 10 and a differential displacement transformer, and the pressure signal output terminal of the differential displacement transformer is Connected to the electrical signal input end of the circuit barrel 3, since each measuring arm drives a probe core 10, the radial change of the measuring arm is converted into the change of the output voltage of the sensor, that is, the change of the inner diameter of the casing is converted into the measurement arm of the instrument Through the mechanical transmission system inside the instrument, the radial displacement of the measuring arm is converted into the vertical displacement of the transmission leg, and then the displacement sensor converts the vertical displacement change of the transmission leg into an electrical signal. The differential displacement transformer used As a displacement sensor is a non-contact electromechanical conversion device, the amplitude of the output electrical signal is proportional to the displacement of the armature.

The mechanical structure design of this scheme is reasonable, and the outer diameter is small. For the casing whose inner diameter at the deformation point is not less than 74mm, it can detect its deformation, bending and perforation holes. In addition, it has the advantages of compact structure, convenient maintenance, high precision, strong reliability, many measurement curves, convenient data interpretation, and can provide an intuitive and three-dimensional well diameter map.

Claims (1)

1. An independent arm caliper imaging logging tool, including an instrument head (1), an upper centralizer (2), a circuit barrel (3), a sensor assembly (4), a measurement transmission assembly (5), a lower centralizer device (6) and tail cap (7), it is characterized in that: The sensor assembly (4) is composed of the probe jacket (8), the sealing joint (9), the probe core (10), the measuring magnetic needle (11), the spring I (12) connected in sequence, and evenly distributed on a circumferential plane and It consists of a plurality of differential displacement transformers installed on the probe core (10) in the sealing joint (9), wherein the differential displacement transformers are used as displacement sensors, and the angle between every two differential displacement transformers is equal, and each measurement A sealing "0" ring is installed on the magnetic needle (11); The measurement transmission assembly (5) is composed of a fixed ring (13), a transmission leg (14), a spring II (15), a casing (16), a measurement arm (17), and a measurement arm seat (18), wherein the protection The cylinder (16) is connected with the sealing joint (9) in the sensor assembly (4), and an annular cavity is formed between the two, and the fixed ring (13) in the cavity is fixed on the lower part of the sealing joint (9), After the transmission leg (14) passes through the fixed ring (13), the upper and lower sections are respectively pressed by the spring I (12) and the spring II (15), and the bottom claw is placed on the arc of the measuring arm (17). In the groove, the top is connected with the measuring magnetic needle (11), which can drive the measuring magnetic needle (11) to move vertically, and the head of each measuring arm (17) is all fixed on a rotating connection point on the measuring arm base (18). Afterbody is " L " shape, sticks out casing (16) outer wall; Above-mentioned each measuring arm (17) and a driving leg (14), spring II (15), spring I (12), a measuring magnetic needle (11), a probe core (10) and a differential displacement transformer constitute a The measuring unit connects the pressure signal output end of the differential displacement transformer to the electrical signal input end of the circuit barrel (3).

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