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Self-contained system for drilling a drainhole

A discharge hole and motorized technology, which is applied to drilling equipment and methods, driving devices for drilling in boreholes, earthwork drilling, etc., and can solve problems such as damage to discharge ditch

Inactive Publication Date: 2009-04-22
TOTAL PUTEAUX FR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aside from the equipment that requires large-scale surfaces, this type of drilling has the disadvantage of requiring circulating fluid to drive the drill bit and tends to damage the drainage trench being drilled during contact with the formation

Method used

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  • Self-contained system for drilling a drainhole
  • Self-contained system for drilling a drainhole
  • Self-contained system for drilling a drainhole

Examples

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Embodiment Construction

[0041] Figure 1 shows a mobile system for drilling a drainage hole 10 transverse to a wellbore 12 in a tight gas reservoir according to a first embodiment of the present invention.

[0042] Typically the wellbore has a diameter of about 10 to 50 cm and a depth of several hundreds or thousands of meters. The discharge holes 10 drilled by the system according to the invention have a diameter of less than 10 cm, preferably less than 5 cm, along a length of about 200 m.

[0043] In this first embodiment, the motorized drilling system includes a drill bit 14, wherein the drill bit 14 includes a tool 16 for drilling the discharge hole 10, and is adapted to power the drill bit 14 into the discharge hole 10 during drilling. The self-propelled device 18. The system according to the invention further comprises a relay unit 20 which is lowered into the wellbore 12 and arranged to be able to place the drill bit 14 against the sidewall of the wellbore 12 in order to initiate the spud of t...

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Abstract

Provided is a self-contained system for drilling a drainhole (10) laterally to a wellbore (12) that includes a drill head (14) with a tool (16) for boring the drainhole (10) and a self-propelled device (18) for advancing the head (14) into the drainhole (10) during boring; a relay unit (20) lowered into the wellbore (12), arranged to position the drill head (14) against the sidewall (22) of the wellbore (12) in order to initiate the boring of the drainhole (10) laterally to the wellbore (12); a cable (24) for supplying electric power to the drill head (14), reeled out from the relay unit (20); and a mechanical system for removing cuttings from the drainhole during boring, the debris removed falling downhole.

Description

technical field [0001] The present invention relates to a mobile system for drilling drainage holes transverse to the wellbore, especially for oil or gas production, and especially for very low permeability gas reservoirs (also known as tight gas reservoirs) middle. Background technique [0002] Tight gas reservoirs are natural gas reservoirs whose origins have very low permeability, eg, below 0.5 mD (milliDarcy), or even below 0.1 mD. In these tight reservoirs, the recovery rate is about 10% with current production technology. Therefore, simply drilling a well is not enough to obtain economical gas production. [0003] To overcome this problem, an alternative technique is to increase the exchange surface between the matrix and the wellbore. Currently, this exchange surface is typically increased using a technique known as hydraulic fracturing. This technique creates a fracture hydraulically, where the fracture is held open by installing a support agent. This technique ...

Claims

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Application Information

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IPC IPC(8): E21B7/04
CPCE21B41/0035E21B2023/008E21B7/046E21B4/04E21B23/001
Inventor 克里斯托夫·阿马得伊埃马纽埃尔·德伯兹
Owner TOTAL PUTEAUX FR
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