US3895527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for measuring pressure related parameters in a borehole
Assignee: Sperry Sun Well Surveying Co
•
Filing: 1973-11-08
•
Granted: 1975-07-22
•
Expires: 1993-11-08
Abstract
Abstract A system for remotely measuring pressure in a borehole includes a probe for placement in the borehole. A pressure measuring device for detecting pressure variations is connected to the probe by means of a tube. A fluid is passed through the tube into the probe which in turn is exposed to borehole pressure and by detecting predictable variations in pressure build-up in the tube, pressure parameters in the borehole can be determined. The system may then be used to detect variations in pressure parameters.
Inventors
- 👤 Billy W Mcarthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:47
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/12; E21B47/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
136 words
A system for detecting downhole pressure of formation fluids in a petroleum reservoir and for providing readings at the surface of such pressure, including a well pipe extending from the surface into the petroleum reservoir; a small diameter hollow tube attached to the outside of said pipe and extending from the surface to the bottom of the pipe; a check valve at the lower end of said tube, said check valve comprising a ball floatable in formation fluids, upper seating means to restrict upward movement of the ball, and lower seating means to restrict downward movement of said ball; surface means for applying fluid pressure to the upper end of the tube; and means at the surface for detecting the rate of change of fluid pressure in the tube as pressure is applied to the surface.
Claim 2
Independent Claim
136 words
A system for detecting downhole pressure of formation fluids in a petroleum reservoir and for providing readings at the surface of such pressure, including a well pipe extending from the surface into the petroleum reservoir; a small diameter hollow tube attached to the outside of said pipe and extending from the surface to the bottom of the pipe; a check valve at the lower end of said tube, said check valve comprising a ball floatable in formation fluids, upper seating means to restrict upward movement of the ball, and lower seating means to restrict downward movement of said ball; surface means for applying fluid pressure to the upper end of the tube; and means at the surface for detecting the rate of change of fluid pressure in the tube as pressure is applied to the surface.
Claim 3
Dependent Claim
130 words
In a system for measuring downhole pressure related parameters in a borehole having a string of pipe extending from the surface into the borehole; small diameter tubing means extending from the surface into the borehole and arranged for attachment to said string of pipe, means at the surface for applying fluid pressure to the surface end of the tubing means, first closure means at the downhole end of the tubing means for preventing the passage of borehole fluids into said tubing means when said tubing means is being run into the borehole, second closure means on said downhole end for preventing the passage of surface applied fluid into the borehole, and means at the surface end of the tubing means for measuring the presence of fluids in the tubing means.
Claim 4
Dependent Claim
130 words
In a system for measuring downhole pressure related parameters in a borehole having a string of pipe extending from the surface into the borehole; small diameter tubing means extending from the surface into the borehole and arranged for attachment to said string of pipe, means at the surface for applying fluid pressure to the surface end of the tubing means, first closure means at the downhole end of the tubing means for preventing the passage of borehole fluids into said tubing means when said tubing means is being run into the borehole, second closure means on said downhole end for preventing the passage of surface applied fluid into the borehole, and means at the surface end of the tubing means for measuring the presence of fluids in the tubing means.
Claim 5
Dependent Claim
54 words
The apparatus of claim 2 wherein said first and second closure means is a check valve comprising a ball floatable in formation fluids, a first valve seat receptive of the ball to restrain upward movement of said ball, and a second valve seat receptive of said ball to restrain downward movement of said ball.
Claim 6
Independent Claim
151 words
A method for determining downhole pressure related parameters in a wellbore including the steps of: running a tube from the earth''s surface into the wellbore so that the upper end of the tube is at the surface and the lower end of the tube is in communication with wellbore fluids, the pressure of which is to be measured; passing a fluid into the surface end of the tube at a substantially constant rate; detecting a rate of change of pressure increase in the tube as fluid is being passed into the tube at the surface; when a substantial decrease takes place in the rate of change of pressure as fluid is being passed into the tube at the surface, ceasing the passing of fluid into the tube and closing the tube at the surface to further fluid passage; and thereafter detecting changes in the pressure of the fluid in the tube.
Claim 7
Independent Claim
151 words
A method for determining downhole pressure related parameters in a wellbore including the steps of: running a tube from the earth''s surface into the wellbore so that the upper end of the tube is at the surface and the lower end of the tube is in communication with wellbore fluids, the pressure of which is to be measured; passing a fluid into the surface end of the tube at a substantially constant rate; detecting a rate of change of pressure increase in the tube as fluid is being passed into the tube at the surface; when a substantial decrease takes place in the rate of change of pressure as fluid is being passed into the tube at the surface, ceasing the passing of fluid into the tube and closing the tube at the surface to further fluid passage; and thereafter detecting changes in the pressure of the fluid in the tube.
Claim 8
Dependent Claim
46 words
The method of claim 4 and further including: closing the lower end of the tube as such tube is being run into the wellbore, and thereafter opening the lower end of the tube by the application of fluid pressure to the upper end of the tube.
Claim 9
Dependent Claim
62 words
The method of claim 4 and further including after detecting a decrease in the rate of pressure change in the tube as fluid is being passed into the surface end of the tube, continuing for a short time the passing of fluid into the surface end of the tube and then closing the surface end of the tube to further fluid passage.
Claim 10
Dependent Claim
63 words
The method of claim 6 wherein a chamber is placed on the lower end of the tube, such chamber having a valve therein which opens where fluid pressure in the tube exceeds downhole pressure and further including opening the valve by the passing of fluid into the tube until the decrease in the rate of change of pressure in the tube is detected.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |