Well drilling method and device

A drilling and drilling fluid technology, applied in the field of drilling methods and devices, can solve the problems of reducing the effective production time of oil wells, high cost of drilling equipment relocation, affecting the normal production of oil wells, etc. The effect of the punch cycle

Pending Publication Date: 2021-09-03
DESHI ENERGY TECH GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, for the exploitation of low-permeability reservoirs, radial drilling technology has been developed rapidly in recent years. However, the traditional radial drilling technology has small casing openings (opening holes with an opening size of 22mm), and formation debris is easy to Accumulated outside the casing, squeeze the casing and cause damage to the casing, thereby a

Method used

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  • Well drilling method and device
  • Well drilling method and device
  • Well drilling method and device

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0071] Example 1

[0072] like Figure 1-3 As shown, embodiments of the present application disclose a drilling device including: guiding assemblies and a well symbol assembly. The guiding assembly includes a tubing 1 and a guide, and the guide is disposed in the bottom end of the tubing 1, and the tubing 1 and the guide are arranged within the sleeve 3; the sleeve assembly includes a continuous tube 5 for punching the sleeve 3 The opening unit and the drilling unit for drilling the formation 6, the opening unit includes a hole drill bit 7, and the diameter of the opening drill bit 7 is 30-80 mm, and the drilling unit includes a drill bit 8, drilling into the drill bit 8. The diameter is not larger than the diameter of the opening drill bit 7; the opening drill bit 7 can enter the oil pipe 1 through the continuous tube 5, and passed through the guide to the sleeve 3 to form a first through hole; drilling drill bit 8 can pass through the connecting tube The oil pipe 1 is entered and...

Example Embodiment

[0103] Example 2

[0104] like Figure 7-8 As shown, the present embodiment differs from the first embodiment in that the guide is the oblique device 17, the oblique instructor 17 is a cylindrical structure, and the top wall of the oblique device 17 is an inclined surface, the inclined surface downward The angle is 1 ° -5 °, preferably 3 °; the opening drill bit 7 has a diameter of 50 to 80 mm, preferably 72 mm. By providing the guide to be the oblique device 17, the opening drill bit 7 is directly inside the sleeve 3, and the direction of the direction of the oblique instrument can ensure a larger diameter open hole 7 smoothly passed through the second pass. The hole is larger than the opening diameter of the sleeve 3, thereby enabling a large diameter of the horizontal well eye 9 to achieve a large diameter first through hole.

[0105] It will be appreciated that when the guide is the oblique device 17, the opening drill bit 7 is punched for the sleeve 3, and it is necessary to c...

Example Embodiment

[0110] Example 3

[0111] Embodiment 3 of the present application provides a drilling method, which can be implemented using drilling devices provided in Example 1 or Embodiment 2, including the following steps:

[0112] (1) Connect the tubing and the guide and enter the designated position of the casing;

[0113] Among them, the income speed is 8-15 m / min, preferably 10 m / min.

[0114] (2) The open hole unit is removed into the tube by continuous tube, so that the opening hole of the opening unit is perforated by the guide to form a first through hole; after the opening is completed, the continuous tube and open Hole unit;

[0115] Among them, the diameter of the opening drill bit is 30-80 mm, and the rotation speed of the opening drill bit is 100-300R / min.

[0116] (3) Enter the drilling unit into the tube through the continuous tube, so that the drilling unit of the drilling unit is performed by the guide and the first via hole to form a horizontal well eye; forming a hor...

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Abstract

The invention discloses a well drilling method and device, and belongs to the field of oil exploitation. The well drilling method comprises the following steps that (1) a guide assembly is connected, the guide assembly is tripped into a designated position of a casing pipe, and the guide assembly comprises an oil pipe and a guider; (2) a trepanning unit is lowered into the oil pipe through a continuous pipe, a trepanning drill bit of the trepanning unit is made to punch the casing pipe through the guider so that a first through hole can be formed, and the diameter of the trepanning drill bit ranges from 30 mm to 80 mm; (3) a drilling unit is lowered into the oil pipe through a continuous pipe, a drilling bit of the drilling unit is made to penetrate through the guider and the first through hole to punch the stratum so as to form a horizontal well hole, the diameter of the drilling bit is not larger than that of the trepanning bit, drilling fluid circulates in the drilling bit, and the horizontal well hole is formed in the oil pipe. The pressure of the drilling fluid is 40 to 60 Mpa.

Description

technical field [0001] The application relates to a drilling method and device, belonging to the field of petroleum exploitation. Background technique [0002] In recent years, the proportion of low-permeability reservoirs in oil and gas field development has gradually increased, and low-permeability reservoirs are restricted by their own reservoir geological conditions and process technology, showing low single-well production, high operating costs, and low economic benefits ( or even negative benefits) and other characteristics, so that a large number of low-permeability reservoirs cannot be economically exploited. Therefore, it is of great significance to seek a mining technology that can not only reduce the development cost but also increase the production of a single well, so as to achieve high production with fewer wells. [0003] At present, for the exploitation of low-permeability reservoirs, radial drilling technology has been developed rapidly in recent years. How...

Claims

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Application Information

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IPC IPC(8): E21B7/04E21B7/18E21B10/42E21B10/60E21B17/20E21B17/10E21B43/10
CPCE21B7/046E21B7/18E21B17/1042E21B17/206E21B43/10E21B10/42E21B10/602
Inventor 崔仕章牛铭崔其辉王亚周曾刚虞云昌宋海滨
Owner DESHI ENERGY TECH GRP CO LTD
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