发明名称 |
METHOD FOR EXTRACTING COAL BED METHANE WITH SOURCE FLUID INJECTION |
摘要 |
The present invention generally provides an inexpensive method for drilling a multilateral wellbore where the pressure exerted on a formation of interest by a column of drilling fluid may be controlled. In one aspect, a method for drilling a lateral wellbore from a main wellbore is provided, including running a string of casing with an injection line connected thereto into the main wellbore, wherein the injection line is disposed along an outer side of the casing and a portion of the casing corresponding to a starting depth of the lateral wellbore is made from a drillable material; running a drillstring through the casing to the starting depth of the lateral wellbore, wherein th e drillstring comprises a drill bit; injecting drilling fluid through the drill sting; and injecting a second fluid, having a density less than that of the drilling fluid, through the injection line at a rate corresponding to an injection rate of the drilling fluid to control hydrostatic pressure exerted by a column of the drilling fluid and the second fluid returning through the casing.
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申请公布号 |
CA2511249(A1) |
申请公布日期 |
2006.01.09 |
申请号 |
CA20052511249 |
申请日期 |
2005.06.30 |
申请人 |
WEATHERFORD/LAMB, INC. |
发明人 |
TERRY, JIM;DIVINE, RON;JOHNSON, DARRELL;BAILEY, TOM;COY, ALEJANDRO;VUYK, ADRIAN |
分类号 |
E21B7/04;E21B7/06;E21B21/00;E21B33/13;E21B41/00;E21B43/00 |
主分类号 |
E21B7/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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