Strong-inhibition strong-lubricity slurry as well as preparation method and application thereof

Abstract

The invention provides strong-inhibition strong-lubricity slurry as well as a preparation method and application thereof, and relates to the technical field of water-based drilling fluids. The strong-inhibition strong-lubricity slurry provided by the invention comprises the following components in parts by weight: 100 parts of water; 0.05-0.07 part of a lubricating drag reducer; 3-5 parts of a tackifier; 4-6 parts of an electropositive inhibitor; and 0.04-0.06 part of a flocculation coating agent. The slurry with strong inhibition and strong lubricity provided by the invention has unique lubrication and drag reduction properties, and plays a role in protecting the trenchless tool bit and improving the drilling efficiency; the slurry has excellent inhibition performance, hydration expansionof clay can be inhibited, and the stability of a hole wall is maintained; therefore, a compact mud film can be formed, the filtration loss is reduced, and the soil pressure is balanced, so that the well wall stability is enhanced, the adhesion coefficient can be reduced, and non-excavation tool bit balling is prevented. The slurry has good rheological property, filtrate loss reduction performanceand lubricity, can meet the requirement of trenchless drilling, and has the advantages of environmental protection and low cost.

Description

Technical field[0001]The invention relates to the technical field of water-based drilling fluids, in particular to a highly inhibited and highly lubricating mud, and a preparation method and application thereof.Background technique[0002]Clay formation is a common formation in the process of non-excavation excavation. When the clay formation contains a large amount of water-sensitive minerals, it is easy to shrink the hole wall by water absorption and expansion of the clay formation, which will increase the drilling torque and reduce the efficiency of footage. It will cause instability of the hole wall. When conventional trenchless mud suppresses water-sensitive formations, it cannot balance the influence of the inhibitor on the bentonite in the mud, which causes the bentonite in the mud to flocculate and settle, and the fluid loss increases sharply, which in turn leads to formation instability.[0003]Due to the low attention paid to trenchless mud in its late start, and the limitatio...

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Problems solved by technology

[0002] Clay stratum is a common stratum in the process of non-excavation excavation. When the clay stratum contains a large amount of water-sensitive minerals, it is very easy to cause the clay stratum to absorb water and expand the pore wall. diameter, the drilling torque will be increased, the footage efficiency will be reduced, and in serious cases, the hole wall will be unstable.

When conventional non-excavation mud suppresses water-sensitive formations, it cannot balance the influence of the inhibitor on the bentonite in the mud, resulting in flocculation and sedimentation of the bentonite in the mud, and a sharp increase in filtration loss, which in turn leads to formation instability

[0003]Due to the low attention paid to trenchless mud and the limitation of engineering budget, there is no trenchless mud that is easy to deploy and low in cost for clay strata system

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