Well drilling method for improving lifting efficiency

A drilling and efficiency technology, applied in the field of drilling to improve lifting efficiency, to achieve the effect of reducing requirements, improving sweep efficiency, and improving working life

Inactive Publication Date: 2013-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, if the lower lift is produced and the lift is on the gas flow path, an underload or air lock will occur

Method used

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  • Well drilling method for improving lifting efficiency

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Embodiment Construction

[0009] Attached below figure 1 The present invention will be further described.

[0010] When the liquid level 4 in the original well is lowered to the vicinity of the horizontal section 1, the lifting efficiency is significantly reduced, and the method of the present invention can be used to improve the lifting efficiency. According to the design data and analysis data of the original horizontal well 1, the wellhead position 3 of the vertical well 2 is determined directly above the horizontal section (or inclined section) of the well bottom, and a vertical well is drilled at the determined wellhead position 3 using vertical drilling technology (existing technology) 2. Make it communicate with the original horizontal well 3 and deepen it to a certain depth, complete the well with the sand control technology (existing sand control well technology), and lower the lifting device (existing device) 6 to a certain depth below the original horizontal well section 1, so that Give...

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Abstract

The invention discloses a well drilling method for improving the lifting efficiency. The technical scheme includes that the well drilling method comprises firstly, analyzing a combination of an actual drilling track of an original horizontal well bore and a completion string and a tripping-in position in detail, and determining communication positions of a vertical well and a horizontal well and the position of the vertical well in order to change the flowing direction of formation fluid to avoid an original fingering channel and improve the flow profile of the formation fluid; then communicating a straight-hole drilling section with the original horizontal well bore by the aid of a vertical well drilling technology, and deepening the straight-hole drilling section to a certain degree to guarantee that a lifting device is always positioned below a working fluid level; cooperating with a sand control process to realize well completion; and finally tripping the lifting device to a position below an original well section and starting production. The well drilling method has the advantages that merits of the horizontal well and merits of the vertical well are combined, shortcomings of the horizontal well and shortcomings of the vertical well are overcome, horizontal well drilling and vertical well exploiting are realized, the flow profile is adjusted, the performance of the lifting device is sufficiently played, the service life of the lifting device is prolonged, and the lifting efficiency of the lifting device is improved.

Description

technical field [0001] The invention relates to a drilling method for improving lifting efficiency, which is used in the fields of petroleum and natural gas exploration and development and salt mining. Background technique [0002] In the middle and late stages of development, the bottom hole pressure is low, and the unit must be lowered into the deflection section or the horizontal section deep in the well. Especially for horizontal wells with short and medium curvature radii, some lifting devices are difficult to pass through the curved section and can only be used in vertical well sections, which limits the best effect of the lifting device. In addition, gas in horizontal wells separates and accumulates in the wellbore, and fluctuates upwards along the wellbore to the surface, causing great changes in production rate and surface pressure. In this case, if the lower lift is produced and the lift is on the gas flow path, an underload or air lock will occur. Contents of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/04E21B19/00
Inventor 冯光通曹向峰马永乾耿应春刘新华
Owner CHINA PETROLEUM & CHEM CORP
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