Study on high-density anti-channeling toughness cement slurry system for shale gas cementing
With the deepening of shale gas development,due to the deep vertical depth,high geothermal gradient,relatively high pore pressure and formation fracture pressure of deep shale gas wells,in order to achieve good displacement effect during cementing operations,the density of cementing slurry is relatively high.High-density cement slurry often has problems such as excessive solid materials,high viscosity of the slurry,poor flowability,and difficulty in controlling the density of the slurry with high viscosity.The dosage of cement slurry weighting agent is large,prone to settling,and there are stability issues.The proportion of cement in high-density cement slurry is relatively small,the compressive strength is low,and there is a problem of anti-channeling.A new high-density anti-channeling toughness cement slurry system for shale gas well cementing has been developed by developing nano anti-channeling agents and composite weighting agents.The on-site application effect is good,which can provide technical support for later deep shale gas well cementing.
shale gas wellcementinghigh-density cement slurrynano anti-channeling agentweighting agent
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