Casing Section Rotation Method and Apparatus
Alfred W. Eustes and Wil iam W. Fleckenstein
Summary: An apparatus and method improve the cement seal at the bottom of surface casing
during drilling operations
Description: It is well known in the industry that moving casing during cement provides
improved cement jobs during drilling operations. There are two ways to move the casing during
cementing: reciprocation and rotation. Both reciprocation and rotation of casing relies upon
the use of the rig at the surface to rotate or reciprocate the entire casing string, which may be
undesirable for operational or safety considerations. Achieving an improved cement seal in the
annulus of the surface casing may prevent migration, which can result in contamination of
surface aquifers. Improving the seal around intermediate casing strings will enhance the ability
of the cement to prevent annular flow during well control events. Improving the seal across the
production casing will improve the isolation of the productive interval and prevent undesirable
water production. This invention consists of an apparatus and method to rotate a section of the
casing without the use of surface rotation. This is accomplished by imparting torque to a tool
connected at the bottom, or within the section of casing to be rotated. This rotation is imparted
hydraulically by the use of a rotary mechanical device that extracts energy from a fluid flow and
converts it into useful work, which causes the section of casing to rotate in response to a fluid
being pumped through, such as cement, spacers and drilling fluids.
Main Advantages of this Invention
 Improves cement seal though downhole rotation
 Method is effective for deep wells, workovers, and cleanouts
Potential Areas of Application
 Oil and Gas
 Cement Service Companies
ID number: 15015
Intel ectual Property Status: US provisional application filed (62/095,319).
Opportunity: We are seeking an exclusive or non-exclusive licensee for marketing,
manufacturing, and sale of this technology.
For more information contact:
William Vaughan, Director of Technology Transfer
Colorado School of Mines, 1500 Illinois Street, Guggenheim Hall Suite 314, Golden, CO 80401
Phone: 303-384-2555; e-mail: