Title:
APPARATUS FOR CONTROLLING THE PRESSURE IN A WELL
United States Patent 3477526
US Patent References:
/RE26220.html
- - RE26220
Bottom hole pressure control in well drilling
- - 2786652
Drilling with two fluids
- - 3268017
Apparatus for maintaining balanced mud circulation to prevent blowouts
- - 3338319
Control for a hydraulically actuated choke in a drilling mud flow line
- - 3362487
/RE26220.html
- - RE26220
Bottom hole pressure control in well drilling
- - 2786652
Drilling with two fluids
- - 3268017
Apparatus for maintaining balanced mud circulation to prevent blowouts
- - 3338319
Control for a hydraulically actuated choke in a drilling mud flow line
- - 3362487
Inventors:
Jones, Marvin R.
Baugh, Benton F.
Baugh, Benton F.
Publication Date:
11/11/1969
View Patent Images:
Export Citation:
Assignee:
CAMERON IRON WORKS INC
Primary Class:
Other Classes:
175/218, 175/38, 73/152.040
International Classes:
E21B21/08; E21B21/00; E21B21/04; E21B7/00; E21B3/12
US Patent References:
| 3372761 | Maximum allowable back pressure controller for a drilled hole |