Wells – Processes – Cementing – plugging or consolidating
Patent
1976-12-23
1978-02-14
Novosad, Stephen J.
Wells
Processes
Cementing, plugging or consolidating
E21B 33138, E21B 4302
Patent
active
040733424
ABSTRACT:
Method for the treatment of unconsolidated sandy formations to stabilize such formation comprising the sequential steps of:
1. Injecting a liquid hydrocarbon containing a minor amount of a water wetting nonionic surface active agent and, from about 0.5 to about 3% of water, into said formation to remove any excess water present therein without completely drying the sand, or optionally to water wet an essentially water free sand formation;
2. Injecting a first treating solution or suspension composed of from about 3 to 20% by volume of a inorganic silicon halide and 80 to 97% by volume of hydrocarbon solvent into the sand formation being consolidated;
3. Injecting a liquid hydrocarbon into said sand formation to effect removal of any excess inorganic silicon halide from the area being consolidated;
4. Injecting a second treating solution composed of from about 3 to about 20% by volume of furfuryl alcohol and from about 80 to about 97% by volume of a high in aromatics (80% or more) petroleum fraction, optionally including from about 0.5 to about 1.5% by volume of a silane bonding agent, into said formation and contacting the first treated sand formation with said second treating solution; 5. Maintaining said inorganic silicon halide and said furfuryl alcohol components of said first and second treating solutions in contact with said sand to be consolidated for a period sufficient to polymerize said components and form an oil permeable but sand impermeable barrier therein.
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Hess et al., "Chemical Method for Formation Plugging," Journal of Petroleum Technology, 5-1971, pp. 559-561, 563, 564.
Young, "Consolidation Technique in Clayey Sands Boosts Flow Rate," The Oil and Gas Journal, 9-18-67, pp. 107-109.
Novosad Stephen J.
Ries Carl G.
Texaco Inc.
Whaley Thomas H.
Young James F.
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