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Downhole intelligent rubber plug device

An intelligent, rubber-plugging technology, applied in wellbore/well components, earth-moving drilling, sealing/packing, etc., can solve the problems of time-delayed sound measurement, failure to achieve self-falling, and inability to achieve clear water replacement, etc. To achieve the effect of reducing the delay of acoustic variation and resistance, the structure is novel and reasonable, and the mixing is avoided.

Active Publication Date: 2016-08-17
王震
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the conventional cementing plug is that it must rely on external liquid displacement to go down, and it cannot realize the self-falling function by itself.
However, the technical solution of using suspension spacer fluid has the defects that the shut-off ball cannot be suspended and the sedimentation effect of clear water and drilling fluid is replaced. Since the replacement of clear water cannot be realized during the displacement process and the shut-off ball and the displacement fluid are not synchronized, the drilling fluid will remain in the casing. The characteristics of thickened sediments when the liquid is not flowing, some wells have the phenomenon of delay measurement and variable resistance

Method used

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  • Downhole intelligent rubber plug device

Examples

Experimental program
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Effect test

Embodiment 1

[0012] Example 1: Apricot 3-But 4-E68 Well

[0013] The design depth of the well: 1239 meters, the position of the cement surface control tool: 894 meters. On September 16, 2012, the downhole intelligent rubber plug device was used for cementing construction. The designed replacement volume of the second replacement: 11.4 cubic meters, and the actual replacement volume of the second replacement: 11.4 cubic meters. Acoustic change detection was conducted on October 7, 2012, and logging was successful once.

[0014] The designed replacement volume of the well’s secondary replacement is consistent with the actual replacement volume. It shows that the downhole intelligent rubber plug device has a high degree of contact with the casing wall, effectively separating and sealing the drilling fluid in the casing from the clean water, ensuring the closure of the ball and the secondary Displacement fluid runs synchronously to avoid the retention of drilling fluid in the casing. A successful...

Embodiment 2

[0014] The designed replacement volume of the well’s secondary replacement is consistent with the actual replacement volume. It shows that the downhole intelligent rubber plug device has a high degree of contact with the casing wall, effectively separating and sealing the drilling fluid in the casing from the clean water, ensuring the closure of the ball and the secondary Displacement fluid runs synchronously to avoid the retention of drilling fluid in the casing. A successful acoustic logging has shown that the downhole smart rubber plug device can shrink within a specified time and fall to the bottom of the artificial well by its own gravity without any adverse effects on subsequent construction. Example 2: Apricot 3-40-E66 well

[0015] The design depth of the well: 1241 meters, the position of the cement surface control tool: 894 meters. On September 23, 2012, the downhole intelligent rubber plug device was used for cementing construction. The designed replacement volume of ...

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Abstract

The invention provides an intelligent downhole plug device comprising a high pressure seal cylinder, and relates to the field of cementing equipment in petroleum engineering. The intelligent downhole plug device is characterized in that a motor cabin is arranged in the high pressure seal cylinder, a seventh gear motor is mounted in the motor cabin, one end of the seventh gear motor is connected with a four head buttress thread screw through a motor link joint, the four head buttress thread screw is connected to a central shaft through a seal bearing which is sequentially provided with a first seal rubber member and a first lotus slice which is fixed through a fixing ring, the top end of the central shaft is a first pressing cover, and the seal rubber member, the lotus slice and the pressing cover can be in single stage or multiple stages. The intelligent downhole plug device has the advantages that structure is novel and reasonable, in cementing construction, the first and second seal rubber bodies are under high construction pressure effect, deformation to certain extent occurs in direction perpendicular to the hole wall, contact extent of the first and second seal rubber bodies and the wall of a sleeve is further enhanced accordingly, drilling fluid in the sleeved can be partitioned and sealed from water effectively, mixing of the drilling fluid and water can be avoided during construction, and delay acoustic variable resistance is reduced.

Description

Technical field [0001] The invention relates to the field of cementing equipment in petroleum engineering, in particular to a downhole intelligent rubber plug device. Background technique [0002] The existing conventional cementing rubber plug technology is to press the rubber plug after all the cement slurry has been poured. It descends with the cement slurry to scrape off the cement slurry adhering to the inner wall of the casing and prevent displacement. The drilling fluid is mixed with the cement slurry to avoid the pollution of the cement slurry at the tail and ensure the quality of the cement slurry at the bottom. When it reaches the baffle, it shows collision pressure, and the cement injection ends. The disadvantage of conventional cementing rubber plugs is that they must rely on external liquid displacement to descend, and they cannot achieve the self-falling function. [0003] There is another technology of applying suspension isolation fluid replacement: suspension isol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/134
Inventor 李国庆王震
Owner 王震