One Trip Drill and Casing Scrape Method and Apparatus
AssigneeBaker Hughes Incorporated
InventorsGregory L. Hern, Yang XU
Life of this patent
Estimating the term…
Abstract
A drilling assembly is tripped in a cased hole to make more open hole. The assembly features retracted scrapers and a closed circulation sub so that the drilling can commence with string pressure delivered to bit nozzles due to the circulation sub being in a closed position. When drilling is done and the bit is to be removed, an object lands on a seat on a sleeve that acts as a piston to break scraper retainers for casing scraping deployment and to open the circulation port. A bypass opens around the seated ball when the sleeve shifts to allow flow around the seated ball for circulation while scraping. Drilling and casing scraping are accomplished in a single trip.
Claims23
A single trip borehole drilling method for extending a borehole through an existing tubular, comprising:
- running in together a drilling assembly on a string that further comprises a drill bit and at least one scraper and a circulation sub;
- retracting said scraper to the string and keeping at least one circulation port closed when drilling with said drill bit;
- positioning said scraper in the existing tubular;
- releasing said scraper and opening at least one port in said circulation sub by delivering at least one object into the borehole and applying pressure with said object located on at least one seat on at least one moving sleeve;
- flowing fluid through said port while using said scraper to scrape the existing tubular as said drilling assembly is brought through the existing tubular.
A subterranean multi-function pressure actuated tool, comprising:
- a tubular housing having at least one wall port;
- a sleeve assembly having a passage therethrough;
- a tool mounted to said housing and selectively locked to said housing in a first position of said sleeve assembly;
- wherein movement of said sleeve assembly to a second position under pressure when said passage is selectively blocked, releases said tool and changes the condition of said wall port between an open and a closed position.
Dependencies are inferred from the claim text.