Conocophillips Company

Praveen Gonuguntla

James C Stevens

Dan Thomas Mueller

Lars Hovda

Amal C Phadke

Rick D Watts

Stein Haavardstein

Brett Borland

Amal Phadke

The invention relates to a cementing tool for use in oil and gas well decommissioning operations, in particular so called perforate, wash and cement procedures. The tool () is designed for running in a well on drill string and for jetting cement through previously formed perforations in the casing () to fill the outer annulus () with cement. The tool () has a cylindrical wall () which is formed from steel () and elastomeric () elements, whereby it is expandable between a first diameter in which it may be run down the well and a second, larger diameter deployed during cementing operations. (FIG.).

Behind casing cementing tool

The invention relates to a method of conducting a perf wash cement ('P/W/C') abandonment job in an offshore oil or gas well annulus (), in particular the washing or cementing operation using a rotating head () with nozzles () dispensing wash fluid or cement at pressure. Certain values of parameters of a washing or cementing job have been found surprisingly to affect the quality of the job, or the degree to which they affect the quality of the job has been unexpected. These include including rotation rate of the tool, the direction of translational movement of the tool, and the volume flow rate and pressure per nozzle of cement or wash fluid (and hence nozzle size).

Behind casing wash and cement

The invention relates to a method of conducting a perf wash cement ('P/W/C') abandonment job in an offshore oil or gas well annulus, in particular the washing or cementing operation using a rotating head with nozzles dispensing wash fluid or cement at pressure. A new design of bottom hole assembly is proposed in which the cementing tool has a relatively large diameter in order to optimize pressure whilst the wash tool has a relatively small diameter. The wash process, for a number of reasons, appears to be less sensitive to tool diameter and making the wash tool smaller reduces the overall risk of stuck pipe.

The invention relates to a cementing tool for use in oil and gas well decommissioning operations, in particular so called perforate, wash and cement procedures. The tool () is designed for running in a well on drill string and for jetting cement through previously formed perforations in the casing () to fill the outer annulus () with cement. The tool () has a cylindrical wall () which is formed from steel () and elastomeric () elements, whereby it is expandable between a first diameter in which it may be run down the well and a second, larger diameter deployed during cementing operations.

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San Antonio, TX, United States of America

Praveen Gonuguntla