Patent US3841152A successfully refreshed from Google Patents.
US3841152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling conditions monitor
Assignee: Halliburton Co
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Filing: 1973-02-02
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Granted: 1974-10-15
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Expires: 1993-02-02
Abstract
Abstract A drilling fluid pressure recording system which produces a digital readout and a dual trace on a chart strip recorder which has a design accuracy of + OR - 4 psi for up scale recording to 4,000 psi full scale. An analog electrical signal is converted into a five order digital signal and the digits reconverted back into two analog signals that are displayed on a dual pen strip chart recorder to provide both coarse and fine traces of the pressure. With both traces on the same chart, the result is a chart record that can be interpreted very accurately at the driller''s console.
Inventors
- 👤 R Guest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:12
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
181 words
Apparatus for indicating down hole well pressure conditions in a wellbore containing pumping means for circulating a drilling fluid down into and up out of said wellbore comprising: a housing having an interior chamber and adapted to be mounted adjacent a pipe carrying drilling fluid; means for communicating the pressure of the drilling fluid within the pipe to the interior chamber of said housing; means for maintaining the housing interior chamber at a constant temperature; a linear pressure transducer located within the interior chamber and adapted to sense the pressure of said drilling fluid and to produce an electrical signal having an amplitude related to the drilling fluid pressure; means within the housing interior chamber for linearly amplifying said electrical signal thereby to produce an amplified analog electrical signal; means for producing a digital signal having at least three digits responsive to the amplitude of the analog electrical signal; and means for displaying one or more of the least significant digits of the digital signal to provide a quickly readable indication of the direction and rate of drilling fluid pressure changes.
Claim 2
Dependent Claim
181 words
Apparatus for indicating down hole well pressure conditions in a wellbore containing pumping means for circulating a drilling fluid down into and up out of said wellbore comprising: a housing having an interior chamber and adapted to be mounted adjacent a pipe carrying drilling fluid; means for communicating the pressure of the drilling fluid within the pipe to the interior chamber of said housing; means for maintaining the housing interior chamber at a constant temperature; a linear pressure transducer located within the interior chamber and adapted to sense the pressure of said drilling fluid and to produce an electrical signal having an amplitude related to the drilling fluid pressure; means within the housing interior chamber for linearly amplifying said electrical signal thereby to produce an amplified analog electrical signal; means for producing a digital signal having at least three digits responsive to the amplitude of the analog electrical signal; and means for displaying one or more of the least significant digits of the digital signal to provide a quickly readable indication of the direction and rate of drilling fluid pressure changes.
Claim 3
Dependent Claim
45 words
The apparatus of claim 1 including a low pass filter means connected between said amplifying means and said digital signal producing means for removing periodic amplitude variations from the analog electrical signal caused by pressure variations resulting from operation of the drilling fluid pumping equipment.
Claim 4
Dependent Claim
48 words
The apparatus of claim 2 wherein said displaying means includes: means for generating a first analog signal having an amplitude related to at least two of the most significant digits; and, means for producing a time varying trace related in amplitude to that of the first analog signal.
Claim 5
Dependent Claim
58 words
The apparatus of claim 3 wherein said display means includes: means for generating a second analog signal having an amplitude related to at least two of the least significant digits; and, means for producing a time varying trace related in amplitude to that of the second analog signal in juxtaposition to the trace of the least significant digit.
Claim 6
Dependent Claim
39 words
The apparatus of claim 4 wherein said means for producing a time varying trace includes a strip chart recorder having a pair of pens movable independently over the same chart in response to said first and second analog signals.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |