US4598771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for firing a perforating gun and simultaneously recording the downhole pressure
Assignee: Halliburton Co
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Filing: 1985-02-28
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Granted: 1986-07-08
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Expires: 2005-02-28
Abstract
Abstract An improved downhole pressure measuring apparatus includes a flow tube conveying pressurized fluid from a fluid source on the surface into a borehole. The fluid flow and pressure is measured at the surface and the downhole pressure is determined. A perforating gun firing mechanism may be attached to a lower end of the flow tube and positioned in the borehole respective to a perforating gun for the firing thereof. The gun is fired by manipulating the flow tubing and the downhole pressure is simultaneously recorded.
Inventors
- 👤 Roy R. Vann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:51
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06; E21B43/00; E21B43/11; E21B43/116; E21B43/1185; E21B43/119
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
155 words
In a cased borehole which penetrates a hydrocarbon-containing formation, the method of perforating the casing while measuring the downhole pressure adjacent to the formation, comprising the steps of: positioning a perforating gun within the casing adjacent to the formation to be completed, the perforating gun being connected to one end of a string of tubing; attaching a downhole end of a gun firing mechanism to a downhole end of a flow tube; connecting an uphole end of said flow tube to a pressurized fluid source; lowering said gun firing mechanism into the borehole through the string of tubing connected to the perforating gun; establishing a flow of fluid through said flow tube into the borehole; measuring the flow and pressure of the fluid at the uphole end of said flow tube and determining the pressure at the downhole end thereof; and manipulating the flow tube to fire the perforating gun and simultaneously measuring downhole pressure.
Claim 2
Dependent Claim
155 words
In a cased borehole which penetrates a hydrocarbon-containing formation, the method of perforating the casing while measuring the downhole pressure adjacent to the formation, comprising the steps of: positioning a perforating gun within the casing adjacent to the formation to be completed, the perforating gun being connected to one end of a string of tubing; attaching a downhole end of a gun firing mechanism to a downhole end of a flow tube; connecting an uphole end of said flow tube to a pressurized fluid source; lowering said gun firing mechanism into the borehole through the string of tubing connected to the perforating gun; establishing a flow of fluid through said flow tube into the borehole; measuring the flow and pressure of the fluid at the uphole end of said flow tube and determining the pressure at the downhole end thereof; and manipulating the flow tube to fire the perforating gun and simultaneously measuring downhole pressure.
Claim 3
Dependent Claim
32 words
A method according to claim 1 further comprising the step of storing said flow tube in wound configuration about a drum which may be rotated to raise and lower said flow tube.
Claim 4
Dependent Claim
15 words
A method according to claim 1 wherein the hydrocarbon-containing formation exceeds 125° C. in temperature.
Claim 5
Dependent Claim
25 words
A method according to claim 1 wherein said perforating gun is extended into the cased borehole on the end of a string of production tubing.
Claim 6
Dependent Claim
127 words
Apparatus for completing a well comprising: a tubing string; a packer connected to one end of the tubing string; a vent located below the packer and connected thereto to allow the flow of fluids from said well into the tubing string after said well has been completed; a perforating gun having a firing head thereon connected to one end of the vent; a flow tube reciprocally, removably retained within the tubing string; apparatus for measuring downhole pressure connected to one end of the flow tube; and means affixed to the other end of the flow tube for firing the perforating gun, whereby the means may be manipulated to fire the gun and changes in downhole pressure as a result of perforation are measured by the measuring apparatus.
Claim 7
Dependent Claim
127 words
Apparatus for completing a well comprising: a tubing string; a packer connected to one end of the tubing string; a vent located below the packer and connected thereto to allow the flow of fluids from said well into the tubing string after said well has been completed; a perforating gun having a firing head thereon connected to one end of the vent; a flow tube reciprocally, removably retained within the tubing string; apparatus for measuring downhole pressure connected to one end of the flow tube; and means affixed to the other end of the flow tube for firing the perforating gun, whereby the means may be manipulated to fire the gun and changes in downhole pressure as a result of perforation are measured by the measuring apparatus.
Claim 8
Dependent Claim
35 words
Apparatus according to claim 5 wherein said measuring apparatus comprises: a source of fluid, the source providing a generally positive flow of fluid; and means for transporting fluid from the source into the flow tube.
Claim 9
Dependent Claim
49 words
Apparatus according to claim 6 wherein the source provides fluid flow at a substantially constant pressure, and wherein the measuring apparatus further comprises: means for measuring flow through the transporting means and providing an output signal indicative thereof; and means connected to the measuring means for determining downhole pressure.
Claim 10
Dependent Claim
62 words
Apparatus according to claim 6 wherein the source provides a generally positive flow of fluid at a substantially constant rate of flow, and wherein the measuring apparatus further comprises: means connected to the transporting means for measuring the pressure of fluid from the source and providing an output signal indicative thereof; and means connected to the measuring means for determining downhole pressure.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |