Patent ID: 11873626
Assignee: YOUNGQUIST BROTHERS, LLC
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A process for drilling a water injection well using a drilling derrick with rotary drilling, including a rotary table, drill pipe, attachments, and blowout preventer, initially using drilling mud, a source of power outside said injection well, said process including the following steps:
(a) drilling a first hole with said drill pipe and said drilling derrick;
(b) snubbing in a casing having a diameter smaller than said hole;
(c) drilling a first pilot hole below the lower end of said casing;
(d) installing a temporary well header below said rotary drive and said blowout preventors;
(e) attaching a drop pipe to an underside of said temporary well header, which drop pipe extends downward therefrom, diameter of said drop pipe being larger than said attachments but less than said casings;
(f) said drop pipe having a valve secured on a lower end of said drop pipe;
(g) pivotally connecting an actuator to said valve to open or close a bottom opening in said drop pipe, said actuator being opened or closed by said source of power from outside said injection well;
(h) lowering said drill pipe and attachments into said drop pipe with said valve being closed;
(i) securing said rotary drive and stripper rubber to said drill pipe above said temporary well header;
(j) opening said valve with said actuator;
(k) repeatedly extending said drill pipe and attachments into said pilot hole for as needed testing;
(l) repeatedly retracting said drilling pipe and attachment back into said drop pipe during said testing;
(m) closing said valve with said actuator;
(n) killing said well and removing said temporary well header;
(o) removing said drilling pipe, attachment and drop pipe;
(p) reinserting said drilling pipe to drill a reduced diameter casing hole to receive a reduced diameter casing therein;
(q) cementing said reduced diameter casing;
(r) repeating steps (c) through (q) for each successively smaller diameter casing being inserted therein.