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== Ways to prevent barite sag ==
== Ways to prevent barite sag ==


Barite sag can lead to well-control issues and [[Stuck_pipe|stuck pipe]] and can aggravate [[Hole_cleaning|hole cleaning]] problems. A well-designed sweep program can help prevent or minimize the occurrence of sag. Recent field results indicate significant success in preventing sag using properly formulated weighted sweeps. When using an emulsion-based synthetic fluid that contains no commercial clays, operators have experienced little or no detectable barite sag, based on data retrieved from downhole pressure-sampling tools and drilling-fluid-density measurements recorded while circulating bottoms up.<ref name="r1">Burrows, K., Carbajal, D., Kirsner, J. et al. 2004. Benchmark Performance: Zero Barite Sag and Significantly Reduced Downhole Losses with the Industry's First Clay-Free Synthetic-Based Fluid. Presented at the IADC/SPE Drilling Conference, Dallas, Texas, 2-4 March. SPE-87138-MS. [http://dx.doi.org/10.2118/87138-MS http://dx.doi.org/10.2118/87138-MS].</ref> <ref name="r2">Hsia, R. and Patrickis, A. 2004. Case History: Zero Whole Mud Losses Achieved During Casing and Cementing Operations on Challenging Deepwater Well Drilled with Clay-Free Synthetic-Based Fluid. Presented at the AADE Drilling Fluids Conference, Houston, 6–7 April. AADE-04-DF-HO-36.</ref>
Barite sag can lead to well-control issues and &#x5B;&#x5B;Stuck_pipe|stuck pipe&#x5D;&#x5D; and can aggravate &#x5B;&#x5B;Hole_cleaning|hole cleaning&#x5D;&#x5D; problems. A well-designed sweep program can help prevent or minimize the occurrence of sag. Recent field results indicate significant success in preventing sag using properly formulated weighted sweeps. When using an emulsion-based synthetic fluid that contains no commercial clays, operators have experienced little or no detectable barite sag, based on data retrieved from downhole pressure-sampling tools and drilling-fluid-density measurements recorded while circulating bottoms up.<ref name="r1">Burrows, K., Carbajal, D., Kirsner, J. et al. 2004. Benchmark Performance: Zero Barite Sag and Significantly Reduced Downhole Losses with the Industry's First Clay-Free Synthetic-Based Fluid. Presented at the IADC/SPE Drilling Conference, Dallas, Texas, 2-4 March. SPE-87138-MS. http://dx.doi.org/10.2118/87138-MS.</ref>&nbsp;<ref name="r2">Hsia, R. and Patrickis, A. 2004. Case History: Zero Whole Mud Losses Achieved During Casing and Cementing Operations on Challenging Deepwater Well Drilled with Clay-Free Synthetic-Based Fluid. Presented at the AADE Drilling Fluids Conference, Houston, 6–7 April. AADE-04-DF-HO-36.</ref>


== References ==
== <references /> ==
 
&lt;references /&gt;


== See also ==
== See also ==

Revision as of 12:46, 29 June 2015

Barite sag can occur in high-angle wells (possibly at 35°, but increasingly likely at ≥ 50°, then diminishing as the interval approaches 75 to 90°). The most severe sag incidents typically occur in the 45 to 65° range. Sag causes a decrease in drilling-fluid density, which is particularly noticeable when circulating bottoms up after a long noncirculating period. The barite falls to the low side of the wellbore and slides toward the bottom, creating an accumulation of weighted silt around the lower part of the drillstring.

Ways to prevent barite sag

Barite sag can lead to well-control issues and [[Stuck_pipe|stuck pipe]] and can aggravate [[Hole_cleaning|hole cleaning]] problems. A well-designed sweep program can help prevent or minimize the occurrence of sag. Recent field results indicate significant success in preventing sag using properly formulated weighted sweeps. When using an emulsion-based synthetic fluid that contains no commercial clays, operators have experienced little or no detectable barite sag, based on data retrieved from downhole pressure-sampling tools and drilling-fluid-density measurements recorded while circulating bottoms up.[1] [2]

  1. Burrows, K., Carbajal, D., Kirsner, J. et al. 2004. Benchmark Performance: Zero Barite Sag and Significantly Reduced Downhole Losses with the Industry's First Clay-Free Synthetic-Based Fluid. Presented at the IADC/SPE Drilling Conference, Dallas, Texas, 2-4 March. SPE-87138-MS. http://dx.doi.org/10.2118/87138-MS.
  2. Hsia, R. and Patrickis, A. 2004. Case History: Zero Whole Mud Losses Achieved During Casing and Cementing Operations on Challenging Deepwater Well Drilled with Clay-Free Synthetic-Based Fluid. Presented at the AADE Drilling Fluids Conference, Houston, 6–7 April. AADE-04-DF-HO-36.

See also

[[Drilling_fluid_challenges|Drilling fluid challenges]]

[[PEH:Drilling_Fluids|PEH: Drilling Fluids]]

Noteworthy papers in OnePetro

W. Dye, SPE, G. Mullen, SPE, and W. Gusler, SPE, Baker Hughes Drilling Fluids: Field-Proven Technology To Manage Dynamic Barite Sag, 98167-MS, http://dx.doi.org/10.2118/98167-MS

Paul D. Scott, Marathon Oil Company; Mario Zamora, Catalin Aldea, M-I: Barite-Sag Management: Challenges, Strategies, Opportunities, 87136-MS, http://dx.doi.org/10.2118/87136-MS

External links

== Category ==
[[Category:1.6 Drilling operations]] [[Category:YR]]