Methods and systems for determining manufacturing and operating parameters for a deviated downhole well component

Patent metadata

Field	Value
Publication number	US-2016108704-A1
Application number	US-201414895165-A
Country	US
Kind code	A1
Filing date	Jan 17, 2014
Priority date	Jun 21, 2013
Publication date	Apr 21, 2016
Grant date	—

Abstract

Systems and methods for determining manufacturing or operating parameters for a deviated downhole well component, including a method that includes representing a tubular string as nodes separated by segments, determining transfer matrices for determining an i th node's state vector from an i th −1 node's state vector, and defining initial state vector values for the reference node. The nodes are numerable from 1 to N with an initial, mechanically constrained reference node representable with i=0, and each is associated with a state vector describing a corresponding node position and one or more forces present at said node. The method further includes applying the transfer matrices to obtain each of the state vectors' values, deriving from at least one of the state vectors a parameter value for said component, and specifying a component having said parameter value. The parameter value can include a centralizer or stabilizer composition, manufacturing dimensions, or position.

First claim

What is claimed is:

1 . A method for determining manufacturing or operating parameters for a deviated downhole well component, the method comprising:
representing a tubular string as a sequence of nodes separated by segments, said nodes being numerable from i=1 to N with an initial, mechanically constrained reference node representable with i=0, and each node being associated with a state vector describing a position of the corresponding node and one or more forces present at said corresponding node; determining a sequence of transfer matrices enabling the determination of an i th node's state vector from an i th −1 node's state vector; defining values of an initial state vector for the reference node; applying the transfer matrices to obtain values for each of the state vectors; deriving from at least one of the state vectors a parameter value for said component, the parameter value being in a set consisting of a composition, manufacturing dimensions, and a position for a centralizer or stabilizer; and specifying a component having said parameter value.

2 . The method of claim 1 , wherein said specifying includes providing the composition or a dimensional specification to a manufacturer of said component.

3 . The method of claim 1 , wherein said specifying includes providing the position for the centralizer or stabilizer to an installer of said component.

4 . The method of claim 1 , wherein each state vector comprises a vertical position u i , a horizontal position v i , and an inclination angle α i , associated with node i; and further comprises a vertical force F xi , a horizontal force F hi and a bending moment M i present at node i; and wherein the state vector is representable as [u i , v i , α i , F xi , F hi , M i , 1] T .

5 . The method of claim 4 , wherein the transfer matrix for the i th node, said i th node associated with a tubular segment, is representable as:

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Assignees

• Landmark Graphics Corp

Inventors

• Samuel Robello
• Wang Zheying

Classifications

• E21B7/04 Primary

  Directional drilling · CPC title

• E21B17/00

  Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; {Cables;} Casings; Tubings · CPC title

• G06F17/16

  Matrix or vector computation {, e.g. matrix-matrix or matrix-vector multiplication, matrix factorization (matrix transposition G06F7/78)} · CPC title

• E21B41/00 Primary

  Equipment or details not covered by groups E21B15/00 - E21B40/00 · CPC title