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US3722594A Expired / Lapsed US ⏱️ 0.0 years remaining

Well methods using small diameter tubing

Assignee: Camco Inc
•
Filing: 1971-05-20
•
Granted: 1973-03-27
•
Expires: 1991-05-20
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Abstract

Abstract Well methods using small diameter tubing introduced into and withdrawn from the well by an injector apparatus. The tubing is introduced into and withdrawn from the well by the injector from a tubing-holding reel. Liquids in the well are removed by gas injection as the tubing is introduced. The methods include displacements, fluid injections such as injections of acids, corrosion inhibitors, surfactants, plastics, cement, drilling fluids, alcohols, other solvents, or other chemicals used for treatments in wells and at formations or reservoirs penetrated by wells. The methods also include methods for the dewatering or drying of pipelines, shafts, ducts, vents, or the like. In most cases, the methods include the introduction of an inert gas such as nitrogen through the small diameter tubing. Other gases may also be introduced through the small diameter tubing. The methods are especially suitable for use in petroleum wells, but may if suitable be used in water wells.

Inventors

  • 👤 A Smith
  • 👤 R Plummer
  • 👤 C Johnson

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 09:16
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 53 words
Method according to claim 1, said treatment comprising displacement of fluid from the well, the well having at least one flow passage therethrough in addition to said tubing, and fluid being displaced from the well upwardly through at least one said additional flow passage by said high pressure gas introduced through said tubing.
Claim 2
Dependent Claim 10 words
Method according to claim 2, said pressured gas being nitrogen.
Claim 3
Dependent Claim 39 words
Method according to claim 1, said treatment comprising introduction of a reagent into the well, including admixing a reagent with said pressured gas and introducing the mixed gas and reagent through the tubing into the well in gasified form.
Claim 4
Dependent Claim 10 words
Method according to claim 4, said pressured gas being nitrogen.
Claim 5
Dependent Claim 43 words
Method according to claim 4, said reagent being pressured into the formation by adjusting the pressure of said pressured gas sufficient to penetrate the formation, and subsequently releasing the pressure to allow the spent gasified reagent to reenter the well from the formation.
Claim 6
Dependent Claim 22 words
Method according to claim 6, including thereafter introducing pressured gas into the well to dissipate remaining spent gasified reagent from the formation.
Claim 7
Dependent Claim 22 words
Method according to claim 6, including thereafter introducing pressured gas into the well to purge the well of said spent gasified reagent.
Claim 8
Dependent Claim 29 words
Method according to claim 6, including moving the lower end of the small diameter tubing to at least one additional vertical location in the well, and repeating said treatment.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-03-26 1976-09-25 1977-03-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-03-26 1980-09-25 1981-03-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-03-26 1984-09-25 1985-03-27 $7700.00 Window Closed / Lapsed

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