Patent EP0419281A2 successfully refreshed from Google Patents.
EP0419281A2
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EP
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Method of cementing a well
Assignee: Halliburton Co
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Filing: 1990-09-21
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Granted: —
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Expires: 2010-09-21
Abstract
Abstract A method of performing a cement job on a well so that a cement slurry is made and placed in the well, said method comprising the steps of: (a) flowing cement and water through a mixer into a tub to provide a first body of cement slurry; (b) flowing a portion of the first body of cement slurry into a displacement tank to provide a second body of cement slurry; (c) flowing the second body of cement slurry from the displacement tank into the well; (d) flowing displacement fluid into the displacement tank; and (e) flowing displacement fluid from the displacement tank into the well behind the cement slurry to place the cement slurry at a desired location in the well.
Inventors
- 👤 Thomas E. Allen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 20:48
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; B; B01; B01F; B01F33/00; B01F33/80; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86734; Y10T137/87571; Y10T137/87652; Y10T137/8766; Y10T137/87676
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
A method of performing a cement job on a well so that a cement slurry is made and placed in the well, said method comprising the steps of: (a) flowing cement and water through a mixer into a tub to provide a first body of cement slurry; (b) flowing a portion of the first body of cement slurry into a displacement tank to provide a second body of cement slurry; (c) flowing the second body of cement slurry from the displacement tank into the well; (d) flowing displacement fluid into the displacement tank; and (e) flowing displacement fluid from the displacement tank into the well behind the cement slurry to place the cement slurry at a desired location in the well.
Claim 2
Independent Claim
121 words
A method of performing a cement job on a well so that a cement slurry is made and placed in the well, said method comprising the steps of: (a) flowing cement and water through a mixer into a tub to provide a first body of cement slurry; (b) flowing a portion of the first body of cement slurry into a displacement tank to provide a second body of cement slurry; (c) flowing the second body of cement slurry from the displacement tank into the well; (d) flowing displacement fluid into the displacement tank; and (e) flowing displacement fluid from the displacement tank into the well behind the cement slurry to place the cement slurry at a desired location in the well.
Claim 3
Dependent Claim
24 words
A method according to claim 1, further comprising recirculating at least portions of the first and second bodies of cement slurry through the mixer.
Claim 4
Dependent Claim
53 words
A method according to claim 2, wherein said step of flowing cement and water includes controlling both a valve through which the cement flows and a valve through which the water flows into the mixer in response to measured densities of the recirculated portions of the first and second bodies of cement slurry
Claim 5
Dependent Claim
33 words
A method according to claim 1,2 or 3, further comprising, after step (c), washing the displacement tank with a washing fluid and flowing used washing fluid from the displacement tank into the tub.
Claim 6
Dependent Claim
151 words
A method according to claim 4, wherein said method further comprises, after said step (c): washing the displacement tank with washing water; flowing the washing water from the displacement tank so that the washing water combines with cement and water flowing through the mixer into the tub to add to the first body of cement slurry; flowing a portion of the added-to first body of cement into another displacement tank to provide a third body of cement slurry; flowing the third body of cement slurry from the respective displacement tank into the well; washing with more washing water the displacement tank from which the third body of cement slurry was flowed, and flowing such more washing water into the tub; and flowing displacement fluid into the washed displacement tank from which the third body of cement slurry was flowed; and said step (e) includes flowing displacement fluid from both displacement tanks.
Claim 7
Independent Claim
212 words
A method of performing a cement job on a well so that a cement slurry is made and placed in the well, said method comprising: flowing dry cement through a valve into a flow mixer connected to a tub mounted on a vehicle located at the well; flowing water through a valve in the flow mixer; collecting in the tub a mixture of the cement and water from the flow mixer; flowing at least part of the collected mixture from the tub into at least one of two displacement tanks mounted on the vehicle so that cement slurry is in at least one of the displacement tanks; recirculating mixture from the tub and cement slurry from the at least one displacement tank back to the flow mixer; pumping cement slurry from the at least one displ-acement tank into the well; washing the at least one displacement tank after the cement slurry has been pumped theref rom; filling the washed at least one displacement tank with displacement fluid; pumping displacement fluid from the at least one displacement tank into the well behind the cement slurry; and wherein said steps of flowing dry cement and flowing water include controlling the respective valves in response to measured densities of the recirculated mixture and cement slurry.
Claim 8
Independent Claim
212 words
A method of performing a cement job on a well so that a cement slurry is made and placed in the well, said method comprising: flowing dry cement through a valve into a flow mixer connected to a tub mounted on a vehicle located at the well; flowing water through a valve in the flow mixer; collecting in the tub a mixture of the cement and water from the flow mixer; flowing at least part of the collected mixture from the tub into at least one of two displacement tanks mounted on the vehicle so that cement slurry is in at least one of the displacement tanks; recirculating mixture from the tub and cement slurry from the at least one displacement tank back to the flow mixer; pumping cement slurry from the at least one displ-acement tank into the well; washing the at least one displacement tank after the cement slurry has been pumped theref rom; filling the washed at least one displacement tank with displacement fluid; pumping displacement fluid from the at least one displacement tank into the well behind the cement slurry; and wherein said steps of flowing dry cement and flowing water include controlling the respective valves in response to measured densities of the recirculated mixture and cement slurry.
References Cited (Backward Citations)
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