PRESSURE BALANCED DRILLING SYSTEM AND METHOD USING THE SAME,申请号WO2011US52688-传众专利搜索

PRESSURE BALANCED DRILLING SYSTEM AND METHOD USING THE SAME

申请公布号：WO2012040419(A2)

申请号：WO2011US52688

申请日期：2011.09.22

申请公布日期：2012.03.29

申请人：

MILLER, CHARLES, J.

发明人：MILLER, CHARLES, J.

分类号：E21B33/08;E21B19/08;E21B34/02

主分类号：E21B33/08

摘要：A well drilling system including: an annular valve; a well casing in fluid communication with the annular valve; a first check valve in fluid communication with the annular valve; a hydraulic cylinder including a first chamber having an inlet and an outlet, wherein the inlet of the first chamber is in fluid communication with an outlet of the first check valve; and a transfer unit including an inlet and an outlet, wherein the inlet of the transfer unit is in fluid communication with the outlet of the first chamber, the outlet of the transfer unit is in fluid communication with an inlet of a second check valve, and an outlet of the second check valve is in fluid communication with the annular valve.