发明名称 |
BALL SEAT MILLING AND RE-FRACTURING METHOD |
摘要 |
A well that has a plurality of sliding sleeves used to originally fracture multiple zones with balls of increasing size dropped on balls seats to sequentially open ports for fracturing in a direction toward the well surface is refractured. The method involves using a bottom hole assembly (BHA) that has a fluid motor driven mill that mills out ball seats and has with it a ported sub and a resettable packer. Once the lowermost ball seat is milled out a ball is dropped into the BHA to isolate the fluid motor and open a ported sub below a resettable packer. The dropped ball also enables a collet to latch an open sleeve to give a surface signal that the BHA is located properly for packer deployment so that the refracturing can begin through the coiled tubing string that can support the BHA or in a surrounding annular space. |
申请公布号 |
CA2857125(C) |
申请公布日期 |
2016.11.29 |
申请号 |
CA20122857125 |
申请日期 |
2012.11.08 |
申请人 |
BAKER HUGHES INCORPORATED |
发明人 |
O'MALLEY, EDWARD J. |
分类号 |
E21B4/02;E21B33/122;E21B34/06;E21B43/25 |
主分类号 |
E21B4/02 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|