PREVENTION OF WIRELINE DAMAGE AT A DOWNHOLE WINDOW

摘要

A bottom hole assembly (BHA) which is transported via a wireline through downhole and lateral wellbores and thence through a wellbore window aperture, the BHA carrying with it a blocking tool which is adapted to engage the edge of a lateral wellbore window and prevent the wireline from contacting and abrading against that edge of the window, the blocking tool being detachable from the BHA which proceeds axially distally through the wellbore window while the wireline slides through the blocking tool. Upon withdrawal of the BHA the blocking tool is reattached thereto and is removed with it.

主权项

1. A method of reducing potential damage to a wireline having a BHA coupled to its distal end when said wireline is axially extended through and past edges of a window opening that extends from the outer to the inner side of the wall of a lateral wellbore, the BHA having a proximal and distal ends, the wireline and BHA having outer diameter less than that of said window, the method comprising the steps:
a. removably coupling a blocking tool to the proximal end of said BHA, b. coupling said BHA to the distal end of said wireline, c. directing said wireline and BHA to said window in said lateral wellbore, d. directing said blocking tool to expand to a diameter greater than the diameter of said window, e. de-coupling said blocking tool from said BHA and allowing said wireline and BHA to axially enter and traverse said window and enter said wellbore while said blocking tool prevents said wireline and BHA from contacting said edges of said window f. subsequently withdrawing said wireline and BHA outward through said window while said blocking tool continues to prevent said wireline and BHA from contacting said edges of said window, and g. re-coupling said BHA to the proximal end of said blocking tool as said wireline and BHA are withdrawn through said window.