Claims
- 1. A method of placing cement in an outer annulus around a first tube suspended within a well bore, said first tube having a first flow bore therein, said method comprising the steps of:
a. providing a pair of axially separated annulus barriers in an outer annulus around said first tube; b. providing an ingress flow orifice in said first tube between said annulus barriers with greater proximity to a first annulus barrier; c. providing an egress flow orifice in said first tube between said annulus barriers with greater proximity to a second annulus barrier; d. enclosing said egress flow orifice with a screen having fluid flow openings of a selected dimension; e. suspending a cementing tool within said first flow bore, said cementing tool having a second flow bore and a cement flow orifice between said first and second flow bores, sealing elements bridging an inner annulus between said cementing tool and said first tube to isolate a flow channel from said second flow bore into said outer annulus; f. blending an additive with cement, said additive having the capacity to plug the fluid flow openings in said screen; and, g. pumping the blended cement along said second flow bore into said outer annulus until said fluid flow openings in said screen are substantially plugged.
- 2. A method of placing cement as described by claim 1 wherein the additive blended with cement is a particulate.
- 3. A method of placing cement as described by claim 2 wherein dimensions of said particulate are greater than the selected dimensions of said screen.
- 4. A well completion apparatus comprising a downhole tube section having a pair of axially spaced annulus barriers and a pair of transverse flow orifices between said annulus barriers, one of said flow orifices having a screen with calibrated openings for interdicting particles mixed with a fluid material and discharged from the other flow orifice into an annulus between said barriers.
- 5. A well completion apparatus as described by claim 4 wherein said screen is slotted.
- 6. A well completion apparatus as described by claim 4 wherein said screen is meshed.
- 7. A well completion apparatus comprising:
a. a well casing having a pair of axially separated cementing valves between a first pair of external annulus barriers, one of said cementing valves having an ingress orifice for transferring a fluid flow from an exterior space around said casing into an interior casing flow bore; and b. a screen across said ingress orifice having selectively sized screen openings; c. a fluid conduit tube within said casing flow bore having an interior flow bore, a second pair of exterior annulus barriers, a fluid flow orifice from said interior flow bore between said second pair of annulus barriers and a selectively applied flow bore obstruction.
- 8. A well completion apparatus as described by claim 7 wherein said cementing valves have sliding closure sleeves.
- 9. A well completion apparatus as described by claim 7 wherein said conduit tube includes a valve sleeve operating collet for engaging cementing valve closure sleeves.
- 10. A well completion apparatus as described by claim 7 wherein said cementing valves further comprise locking sleeves for selectively securing a final position of said closure sleeves.
RELATED APPLICATION
[0001] This application is related to a U.S. provisional application titled “Positive Indication System for Well Annulus Cement Displacement” filed on Apr. 24, 2001, Ser. No. 60/286,100, and from which priority is claimed for the present application.
Provisional Applications (1)
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Number |
Date |
Country |
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60286100 |
Apr 2001 |
US |