# US 12,110,765 B2 · Method and apparatus for washing an upper completion

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- Number: US 12,110,765 B2
- Document ID: US12110765B2
- Status: Granted
- Kind: B2
- Application number: 17/248,065
- Filed: 2021-01-07
- Published: 2021-04-29
- Granted: 2024-10-08
- Earliest claimed: 2017-11-27
- Assignees: ConocoPhillips Company
- Applicants: Conocophillips Company
- Inventors: Rune Woie
- Web page: https://patentgrep.com/patent/US12110765B2

## CPC

- E21B 37/02: Scrapers specially adapted therefor
- E21B 33/14: for cementing casings into boreholes
- E21B 47/005: Monitoring or checking of cementation quality or level
- E21B 47/117: Detecting leaks, e.g. from tubing, by pressure testing
- E21B 34/06: in wells
- E21B 2200/04: Ball valves
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

The invention relates to the cleaning of a wellbore including a reservoir liner 3 and an upper portion 2 of the wellbore, by running in only one string into the wellbore and performing a reservoir liner cementing operation, displacing the cement 7 with completion fluid 8, followed using the same string to circulate mud in the upper completion, perform an inflow test on the reservoir liner 3, wash the upper completion and displace it to completion fluid 8.

## Claims

### Claim 1

An apparatus for washing a cased wellbore, wherein the cased wellbore includes an upper, cased part, and wherein the apparatus comprises a drill string and a reservoir liner, and wherein the drill string comprises:
a) a drill pipe, and
b) an assembly fitted to a distal end of the drill pipe, the assembly comprising:
i) a reservoir liner hanger for anchoring the reservoir liner to the upper, cased part;
ii) a reservoir liner hanger running tool;
iii) an inflow test tool capable of forming a sealed connection between the drill string and a polished bore receptacle that is part of the reservoir liner hanger, for performing an inflow test on the reservoir liner; and
iv) a ball valve that is closable, wherein said ball valve allows flow when open and said ball valve acts as a barrier when closed, said ball valve preventing debris from the upper part of the well from falling into the reservoir liner and preventing leakage of fluid coming to surface from the reservoir liner during an inflow test;
wherein the reservoir liner is cemented in the wellbore.

### Claim 2 (depends on 1)

Apparatus as claimed in claim 1 further comprising a scraper for cleaning a portion of the interior of the casing to receive a production packer.

### Claim 3 (depends on 1)

Apparatus as claimed in claim 1, wherein a burst disc is provided at the distal end of the reservoir liner.