Wells – Processes – Dissolving or preventing formation of solid oil deposit
Patent
1993-11-05
1995-10-17
Suchfield, George A.
Wells
Processes
Dissolving or preventing formation of solid oil deposit
166312, 507209, 507211, 507213, 507216, 507215, 507225, 507226, 507227, 507228, 507261, 507276, F21B 3700
Patent
active
054581974
ABSTRACT:
Oil or water based drilling muds, together with other wellbore contaminants such as pipe thread sealants and lubricants are displaced from the well and the wellbore surfaces are cleaned by a system of four serially pumped fluid pills. The first stage fluid pill is a weighted spacer having an alkyl polyglycoside surfactant, a dispersant, a weighting agent and a viscosifier. The second stage pill is a drive fluid formed by water and a viscous polymer gel such as clarified xanthan gum having a viscosity/shear rate characteristic which minimizes mixing of the drive fluid pill with the displacement fluid pill. A buffer fluid pill comprising completion brine is interposed between the drive fluid pill and a fourth stage comprising a wash fluid pill using an organic solvent or a caustic alkyl polyglycoside as a final cleaning stage. The densities of the pills are controlled to minimize mixing and fingering of one pill into the other. The wellbore cleanout system minimizes contamination of the well and also minimizes the volume of completion brine which must be discarded after displacement of the system through the well.
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Atlantic Richfield Company
Martin Michael E.
Suchfield George A.
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