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1. 发明授权

US06550550B2 Downhole drilling apparatus 有权
公开(公告)号：US06550550B2
公开(公告)日：2003-04-22
申请号：US10037154
申请日：2001-11-07
申请人： John Hanton , Tommie A. Freeman , William M. Imwalle
发明人： John Hanton , Tommie A. Freeman , William M. Imwalle
IPC分类号： E21B704
CPC分类号： E21B7/061 , E21B17/00
摘要： A downhole drilling apparatus for interconnection in a casing or liner string having a drill bit disposed thereon for enabling the drilling of intersecting wellbores without removal of the drill bit is disclosed. In a disclosed embodiment, the apparatus comprises a housing having a window. A whipstock is disposed within the housing. Between the window and the whipstock is a filler. The whipstock and the filler define a central bore providing a fluid path through the apparatus. A back pressure valve may be disposed within the central bore to prevent back flow of fluids through the apparatus. Once the total depth of an initial wellbore is reached, the casing or liner string, including the apparatus, may be cemented in place. Thereafter, an intersecting wellbore may be drilled by laterally deflecting a second drill bit with the whipstock through the window of the housing.

2. 发明授权

US06585040B2 Downhole drilling apparatus 有权
公开(公告)号：US06585040B2
公开(公告)日：2003-07-01
申请号：US09994953
申请日：2001-11-27
申请人： John Hanton , Tommie A. Freeman , William M. Imwalle
发明人： John Hanton , Tommie A. Freeman , William M. Imwalle
IPC分类号： E03B311
CPC分类号： E21B7/061 , E21B17/00
摘要： A downhole drilling apparatus for interconnection in a casing or liner string having a drill bit disposed thereon for enabling the drilling of intersecting wellbores without removal of the drill bit is disclosed. In a disclosed embodiment, the apparatus comprises a housing having a window. A whipstock is disposed within the housing. Between the window and the whipstock is a filler. The whipstock and the filler define a central bore providing a fluid path through the apparatus. A back pressure valve may be disposed within the central bore to prevent back flow of fluids through the apparatus. Once the total depth of an initial wellbore is reached, the casing or liner string, including the apparatus, may be cemented in place. Thereafter, an intersecting wellbore may be drilled by laterally deflecting a second drill bit with the whipstock through the window of the housing.

3. 发明授权

US06374924B2 Downhole drilling apparatus 有权
标题翻译：井下钻孔设备
公开(公告)号：US06374924B2
公开(公告)日：2002-04-23
申请号：US09507254
申请日：2000-02-18
申请人： John Hanton , Tommie A. Freeman , William M. Imwalle
发明人： John Hanton , Tommie A. Freeman , William M. Imwalle
IPC分类号： E21B402
CPC分类号： E21B7/061 , E21B17/00
摘要： A downhole drilling apparatus for interconnection in a casing or liner string having a drill bit disposed thereon for enabling the drilling of intersecting wellbores without removal of the drill bit is disclosed. In a disclosed embodiment, the apparatus comprises a housing having a window. A whipstock is disposed within the housing. Between the window and the whipstock is a filler. The whipstock and the filler define a central bore providing a fluid path through the apparatus. A back pressure valve may be disposed within the central bore to prevent back flow of fluids through the apparatus. Once the total depth of an initial wellbore is reached, the casing or liner string, including the apparatus, may be cemented in place. Thereafter, an intersecting wellbore may be drilled by laterally deflecting a second drill bit with the whipstock through the window of the housing.
摘要翻译：公开了一种井下钻孔装置，用于在具有钻头位于其上的套管或衬套管中进行互连，用于能够钻取相交的井筒而不去除钻头。在公开的实施例中，该装置包括具有窗口的壳体。造斜器被放置在壳体内。在窗户和造斜器之间是一个填料。造斜器和填料限定了一个中心孔，提供通过该装置的流体路径。背压阀可以设置在中心孔内以防止流体逆流流过设备。一旦达到初始井眼的总深度，包括该装置在内的套管或衬套可以被粘结就位。此后，可以通过横向偏转造斜器通过壳体的窗口使第二钻头偏转来钻出相交井眼。

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