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Method and system for accessing subterranean deposits from the surface and tools therefor

  • US 8,316,966 B2
  • Filed: 10/31/2007
  • Issued: 11/27/2012
  • Est. Priority Date: 11/20/1998
  • Status: Expired due to Fees
First Claim
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1. A method, comprising:

  • providing a drilling fluid through a drill string while drilling a substantially horizontal drainage well bore extending from a junction into a subterranean zone, the drilling fluid exiting the drill string about a drill bit of the drill string,the junction being between a first well bore extending into the subterranean zone and a second well bore extending into the subterranean zone; and

    providing a pressure fluid down the first well bore when drilling the drainage well bore, the pressure fluid mixing with the drilling fluid to form a fluid mixture returning up the second well bore.

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