Blocking method for perforation well sections of slim hole sidetracking well

A perforated well section and drilling technology, which is applied in the direction of wellbore/well components, earthwork drilling, sealing/isolation, etc., can solve the problems of inconvenient plugging, and achieve the effect of avoiding accidents

Active Publication Date: 2017-05-10
PETROCHINA CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the technical problem that it is inconvenient to use conventional packers for plugging in slimhole sidetracking wells, the plugging method for the perforated well

Method used

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  • Blocking method for perforation well sections of slim hole sidetracking well
  • Blocking method for perforation well sections of slim hole sidetracking well

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Embodiment Construction

[0046] The above-mentioned technical features and advantages of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some, not all, embodiments of the present invention.

[0047] see figure 1 and figure 2 As shown, there are at least two perforated well sections in the sidetracked well section, and each perforated well section is located at different depths of the sidetracked well section, and the casing 20 at each perforated well section is provided with a hole connected to the formation. holes (not shown). figure 1 and figure 2In the shown embodiment, there are two perforated well sections in the sidetracking well section, and the upper boundary 42 of the first perforated well section and the lower boundary 44 of the first perforated well section are the first perforated well section from top to bottom. For one perforated well section, the second perforated well...

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Abstract

The invention provides a blocking method for perforation well sections of a slim hole sidetracking well. One of the blocking method comprises the step that S100, a wellhead well plugging device is opened, a workover fluid is filled in sleeves, and drafting process is conducted; S200, operation pipe columns are put in the well, blocking operation is successively conducted on each perforation well section from top to bottom, and the blocking operation is completed when the blocking operation is conducted on the lowermost perforation well section; and S300, the sleeves are cleaned through a drag bit to the position of an artificial well bottom, wherein the blocking operation comprises the steps that an impending cement plug is set in the position, below the corresponding perforation well section, of each operation pipe column; cement squeezing blocking operation is conducted; temporary cement plugs are formed above the impending cement plugs; the wellhead well plugging device is closed, and waiting on cement setting is conducted under pressure; and the wellhead well plugging device is opened, the downward-put drag bit successively drills through the temporary cement plugs and the impending cement plugs from top to bottom, and blocking operation is completed. The invention further provides the other blocking method for the perforation well sections of the slim hole sidetracking well. A packer is not needed, blocking is completed from top to bottom, the blocking method can be used for permanent well plugging or slim hole major repairing.

Description

technical field [0001] The invention relates to the technical field of oil and gas downhole operations, in particular to a plugging method for a perforated well section of a sidetracked well with a slim hole. Background technique [0002] With the increasing difficulty of oil field production and the development and application of new drilling technologies, the number of slim hole sidetracking wells (the inner diameter of the casing is less than or equal to 86 mm) in the oil field has been increasing. With these special Structural wells are put into production, and there are more and more phenomena of overhaul due to various factors, such as: due to layer adjustment or other production requirements, the original perforated well section needs to be plugged. The conventional plugging method is generally to lower the packer and squeeze cement from bottom to top. However, the inner diameter of the sidetracked section of the slim hole is too small, so it is difficult to find a su...

Claims

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Application Information

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IPC IPC(8): E21B33/13E21B37/02
CPCE21B33/13E21B37/02
Inventor 付玉红杨平阁肖素梅林丽娜何定海谢昕杨凯邢璐薪张春堂
Owner PETROCHINA CO LTD
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