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Cement head magnetic induction rubber plug indicator

A cement head, magnetic induction technology, applied in measurement, wellbore/well components, sealing/packaging, etc., can solve the problem of increasing the volume and weight of the cement head, reducing the force cross-sectional area of ​​the wall, and being unfavorable for transportation and storage, etc. problems, to achieve the effect of easy control and maintenance, short maintenance cycle, easy installation and disassembly

Active Publication Date: 2011-07-27
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical rubber plug indicator has several disadvantages: 1. It has certain resistance to the passing rubber plug, which may damage the rubber plug
2. The mechanical rubber plug indicator will increase the volume and weight of the cement head, which is not conducive to transportation and storage
3. The mechanical rubber plug indicator also needs to open a hole in the cement head body, which reduces the force-bearing cross-sectional area of ​​the wall, causes the average stress to increase and the strength of the container to weaken, and also produces stress concentration in the opening area, making the cement The opening joint of the head becomes the crack initiation point of fatigue failure or brittle failure
4. The mechanical rubber plug indicator requires a flexible rubber seal due to its structure, so it must be maintained after each use, which consumes manpower and material resources

Method used

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  • Cement head magnetic induction rubber plug indicator
  • Cement head magnetic induction rubber plug indicator
  • Cement head magnetic induction rubber plug indicator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A cement head magnetic induction rubber plug indicator, including a top cover, a cement head body and a lower joint, a detection section is arranged between the cement head body and the lower joint, and a screw that extends into the cement head body is provided on the cement head body. Stop pin, the cement head body is provided with a cementing plug limited by a screw stop pin, such as figure 1 As shown, the screw stop pin extends from the cement head body into the cement head body to limit the cementing plug. A magnet is fixedly arranged on the cementing plug, and a magnetic sensor is arranged on the detection section, and the magnetic sensor is connected to the secondary instrument. The situation that the cementing plug passes through the cement head is detected by detecting the change of the magnetic field intensity at the position where the magnetic sensor is placed.

[0025] A preferred embodiment of the present invention is that two cock valves connected by pipel...

Embodiment 2

[0029] In the present invention, a magnetic steel is installed on the cementing plug, and a set of magnetic sensors are installed on the detection section under the cement head body. Cutting the magnetic field line produces a process of magnetic field enhancement, and then converts the enhanced peak signal detected by the magnetic sensor into an audible and visual prompt, indicating that the released rubber plug is moving and passing the position of the magnetic sensor. When it is in the position, the signal rapidly weakens until it disappears. Finally, the magnetic sensor cannot sense any original specific magnetic field lines. At this time, the secondary instrument will also generate lights and buzzer prompts to inform that the cementing plug has successfully entered the well.

[0030] The magnetic sensor is connected with the secondary instrument through the data line, and the secondary instrument is a secondary instrument in the prior art, such as figure 2 As shown, it in...

Embodiment 3

[0032] Install the magnetic block 7 on the cementing rubber plug 8, install two sets of magnetic sensors 10 on the detection section under the cement head body 3, put the cementing rubber plug 8 with the magnetic block 7 installed in the cement head body in advance, When the construction needs to open the screw stop pin 9 of the cement head to release the cementing plug 8 into the well, the strong magnetic block 7 will pass the position of the magnetic sensor 10 along with the cementing plug, and at this time the magnetic field line cutting will have a process of magnetic field enhancement , the magnetic sensor will transmit this enhanced signal to the secondary instrument 11 in time, so the secondary instrument 11 will prompt with light and buzzer sound, indicating that the released cementing plug 8 is moving and passing through the magnetic sensor 10 When the cementing plug 8 is released and enters the well along the casing through the lower joint 6, the strong magnetic block...

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Abstract

The invention discloses a cement head magnetic induction rubber plug indicator, which comprises a top cover, a cement head body and a lower joint. A detection section is arranged between the cement head body and the lower joint; the cement head body is provided with a spiral stop bin which stretches into the cement head body; a well cementing rubber plug which is limited by the spiral stop bin isarranged in the cement head body; a magnet is arranged on the well cementing rubber plug; and the detection section is provided with a magnetic sensor which is connected to a secondary instrument. The rubber plug is not in mechanical hard contact with a cement head when passing through the cement head, so the rubber plug cannot be damaged; and a magnetic field is taken as a medium, the magnetic induction sensor senses the downward movement of the rubber plug, and a detection signal is contactless and has high accuracy and reliability.

Description

technical field [0001] The invention relates to a cement head magnetic induction rubber plug indicator used for detecting the passage of the rubber plug from the cement head during well cementing in the process of oil and gas exploitation. Background technique [0002] Cement head and rubber plug are necessary wellhead devices in cementing construction operations. Usually, the rubber plug is installed in the cement head, and the lower end of the cement head is connected to the casing or drill pipe entering the well. There are bypasses on both sides to connect the construction pipeline for cement injection and mud replacement. The upper bypass is mainly used for pressing. At the same time, the rubber plug is equipped with accessories such as stop pins and pressure gauge interfaces, and its function is essentially a microcosm of the entire cementing process. During well cementing construction, a rubber plug is installed inside. When the rubber plug needs to be put in, open th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/09E21B47/12E21B33/05E21B33/134
Inventor 李福德李斌
Owner BC P INC CHINA NAT PETROLEUM CORP
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