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Sealed wellhead and method of use

A wellhead device and main body technology, applied in sealing/isolation, earthwork drilling, wellbore/well components, etc., can solve problems such as shaking of connected instruments, inability to communicate with acquisition signals, and collapse, so as to avoid collapse accidents and realize multiple The effect of secondary connectivity

Active Publication Date: 2017-04-12
BEIJING ORION ENERGY TECH DEV
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  • Description
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Problems solved by technology

However, the wellhead of the existing vertical well is only allowed to be successfully connected once. If a second connection is desired, since the horizontal well and the vertical well have formed a passage, the drilling fluid will return from the wellhead of the vertical well and cause a downhole collapse accident. The connected instrument shakes, and the signal cannot be collected correctly, resulting in the inability to connect

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  • Sealed wellhead and method of use
  • Sealed wellhead and method of use
  • Sealed wellhead and method of use

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Embodiment Construction

[0027] Explanation of related terms:

[0028] Connectivity: It is to connect two wells together by using a connected instrument (RMRS). The most important phenomenon of successful connection is the drop of vertical pressure in horizontal wells, the return of drilling fluid and gas from the wellhead of vertical wells.

[0029] Connector is also called RMRS (Rotary Magnetic Ranging System) and it is called rotating magnetic ranging system. A strong magnetic joint is added to the BHA, and the probe is lowered into the production vertical well to measure using the magnetic principle. Within a distance of 60m, the two can be accurately detected. Azimuth and distance, guided into the target area with a diameter of 0.5 meters. Using RMRS to guide connected drilling can effectively eliminate the influence of accumulated errors of measurement-while-drilling instruments.

[0030] Vertical well cave: It is the coal seam section where the casing of the coal seam section is forged and mil...

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Abstract

The present embodiments disclose a wellhead sealing device. By the arrangement of an oil cylinder in the wellhead sealing device, a cable and a wellhead can be sealed under the condition that hydraulic oil enters the oil cylinder, specifically, when the hydraulic oil is filled into the oil cylinder, a piston moves towards a main body, thus two rubber blocks are extruded and downsized, and an inner hole contacting the cable in each rubber block is shrunk so as to seal the connecting cable and the wellhead. Moreover, the wellhead of a vertical well can be opened and closed by a brake valve. During multiple times of communication, by the wellhead sealing device, the wellhead of the vertical well can be closed under the action of the brake valve and the oil cylinder, so that underground collapsing accidents and shaking of a connecting instrument can be avoided, and repeated communication can be finally realized.

Description

technical field [0001] The invention relates to the field of coalbed methane exploitation, and more specifically relates to a sealing wellhead device and a use method. Background technique [0002] In the coalbed methane industry, in order to increase the daily output of coalbed methane development and solve the characteristics of low-pressure analysis of coalbed methane, a multi-branched horizontal well or a combination of a horizontal well and a vertical well is often used in the mining method. Among them, in the group mining process where the horizontal well is connected to the vertical well, the horizontal well and the vertical well are generally connected once. During the connection process between the horizontal well and the vertical well, the wellhead of the vertical well is always open. When the horizontal well is connected to the connecting target point 3-5m Just take out the connecting instrument, then continue to drill in the horizontal well, and when the drilling...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/03
Inventor 张立帅张明黄红春
Owner BEIJING ORION ENERGY TECH DEV