초록 ▼

Apparatus for isolating the wellhead equipment from the high pressure fluids pumped down to the producing formation during the procedures of fracturing and acidizing oil and gas wells utilizes a central mandrel concentric inside an outer mandrel and an expandable sealing nipple to seal the outer man

Apparatus for isolating the wellhead equipment from the high pressure fluids pumped down to the producing formation during the procedures of fracturing and acidizing oil and gas wells utilizes a central mandrel concentric inside an outer mandrel and an expandable sealing nipple to seal the outer mandrel against the casing. The sealing nipple is provided with passageways to allow fluids to be pumped down the tubing and/or the annulus between the tubing and the casing in an oil or gas well.

대표청구항 ▼

In a wellhead isolation tool having a body for external mounting on a wellhead, the wellhead having well tubing and casing, an outer mandrel supported in the body and having a lower end, and an inner mandrel supported within the outer mandrel and connectable to the well tubing, the improvement compr

In a wellhead isolation tool having a body for external mounting on a wellhead, the wellhead having well tubing and casing, an outer mandrel supported in the body and having a lower end, and an inner mandrel supported within the outer mandrel and connectable to the well tubing, the improvement comprising: annular sealing means attached to the lower end of the outer mandrel for sealing against the casing; first fluid passage means attached to the body for providing fluid into the tubing; at least one second fluid passage means attached to the body for providing fluid into the annulus between the inner and outer mandrel; an expander for expanding the sealing means into sealing relationship with the casing; and the expander having axial passages extending through the expander to provide a connection between the annulus formed by the casing and tubing and the annulus formed by the inner and outer mandrels.