System and method for determining placement of a downhole device
AssigneeScientific Drilling International, Inc.
InventorJoshua Wilson
Life of this patent
Estimating the term…
Abstract
Data from a well survey includes information on wellbore depth in combination with inclination and azimuth or bending moment taken at measured depth intervals with sufficient short spans to detect micro doglegs in a wellbore over lengths less than, for example, thirty meters. A conversion quantifies micro dogleg severity detected for expression in units of degrees per standardized set length. The converted quantification may also be used in circle-based equations to determine maximum tool length or width for passing tools through the wellbore due to the micro doglegs. Disposing the tool in the wellbore may occur at a location identified to accommodate the tool.
Claims10
A method of placing a tool in a well having micro doglegs, comprising:
- obtaining survey data from the well;
- determining dogleg angles for measured depth intervals indicative of curvatures along less than 8 meters of the well by using the survey data;
- converting the dogleg angles to micro dogleg severity (MDLS) in degrees per set length, wherein the set length is greater than the measured depth intervals;
- determining maximum dimensions of the tool allowed based on restrictions caused by the micro doglegs along the well using the MDLS;
- generating one of a table with the maximum dimensions of the tool listed with depths in the well and a graph plotting the maximum dimensions of the tool versus depth in the well;
- and
- placing the tool in the well at a location where the maximum dimensions of the tool are identified in the generating step that enable the running of the tool to the location due to length and diameter of the tool.
A method of placing a tool in a well having micro doglegs, comprising:
- running a survey device into the well to provide survey data;
- determining a dogleg angle for a measured depth interval along the well from the survey data;
- converting the dogleg angle to micro dogleg severity (MDLS) in degrees per set length greater than the measured depth interval;
- and
- calculating a maximum dimension of the tool using a function of the MDLS to provide (κ) in an equation selected from:
- OD
- t
- =
- (
- 1
- κ
- +
- ID
- w
- 2
- )
- 2
- -
- (
- L
- t
- 2
- )
- 2
- -
- (
- 1
- κ
- )
- +
- ID
- w
- 2
- ,
- to provide a maximum outer diameter of the tool (ODt) for given values of inner diameter of the well (IDw) and maximum length of the tool (Lt);
- L
- t
- =
- 2
-
- (
- 1
- κ
- +
- ID
- w
- 2
- )
- 2
- -
- (
- 1
- κ
- -
- ID
- w
- 2
- +
- OD
- t
- )
- 2
- ,
- to provide the maximum length of the tool (Lt) for given values of the inner diameter of the well (IDw) and the maximum outer diameter of the tool (ODt);
- and
- placing the tool in the well at a location before and proximate to a point in the well closest to earth surface where the maximum dimension of the tool calculated is less than size of the tool.
Dependencies are inferred from the claim text.