基本信息:
- 专利标题： DRILL-IN FLUIDS FOR OIL AND GAS RESERVOIRS WITH HIGH CARBONATE CONTENTS
- 专利标题（中）：钻井液对于高碳酸酯部分油气藏
- 申请号：EP10828768.1 申请日：2010-10-19
- 公开(公告)号：EP2494002A2 公开(公告)日：2012-09-05
- 发明人： HUANG, Tianping , CREWS, James, B. , WILLINGHAM, John, R.
- 申请人： Baker Hughes Incorporated
- 申请人地址： 2929 Allen Parkway, Suite 2100 Houston, TX 77019-2118 US
- 专利权人： Baker Hughes Incorporated
- 当前专利权人： Baker Hughes Incorporated
- 当前专利权人地址： 2929 Allen Parkway, Suite 2100 Houston, TX 77019-2118 US
- 代理机构： Hoffmann, Benjamin
- 优先权： US606502 20091027
- 国际公布： WO2011056410 20110512
- 主分类号： C09K8/60
- IPC分类号： C09K8/60 ; C09K8/66 ; C09K8/02 ; E21B43/26
摘要：
Compositions including relatively low reactivity acids, mixed with viscoelastic surfactants (VESs) and internal breakers may serve as drilling fluids to open underground hydrocarbon reservoirs with carbonate contents of 10 wt % or above. The drilling fluids have low viscosities in the drilling pipe. After the fluid flows out of the drill bit, the acids react with carbonates in the formation thereby increasing the pH of the drilling fluids causing the VES to gel the fluid at the bottom of the hole and the downhole annulus between the drilling pipe and the formation rock. The viscosified drilling fluid will reduce fluid loss and will carry no dissolved drilling debris to the surface. After drilling through the targeted formation, the internal breakers in the viscosified drilling fluids will break down the fluids to permit their removal, and the well is ready to produce with very little or no near well bore damage.