Polymer saturated salt water drilling solution suitable for drilling gas storage warehouse

Abstract

The invention discloses a polymer saturated salt water drilling solution suitable for drilling a gas storage warehouse. The polymer saturated salt water drilling solution is prepared from brine glue solution and bentonite slurry with mass percentage concentration of 4% according to a mass ratio of 1:1, wherein the brine glue solution comprises the following components in parts by mass: 100 parts of brine, 0.3-0.35 part of drilling solution coating agent, 1.5-1.7 parts of sulfonated phenolic resin, 1-1.05 parts of high-viscosity sodium carboxymethylcellulose, 1.0-1.10 parts of compound salt resisting filtration loss reducing agent, 1.5-1.6 parts of drilling solution collapse-proof dilute filtration loss reducing agent SN (Sulfanilamide) resin, 1.0-1.05 parts of sulfonated bitumen, 0.3-0.4 part of sodium carbonate, 0.4-0.45 part of caustic soda and solid industrial salt NaCl which is added till the brine glue solution is saturated. Through the polymer saturated salt water drilling solution suitable for drilling the gas storage warehouse, the pollution problem of the upper stratum slurry and the lower calcium mudstone can be well controlled; and the polymer saturated salt water drilling solution is capable of effectively preventing the collapse of the stratum under the casing pipe shoe and has good effects of controlling dissolution of the salt layer and preventing creep deformation of the slat layer.

Description

technical field [0001] The invention relates to the technical field of gas storage salt cavern drilling engineering, in particular to a polymer-saturated brine drilling fluid that can meet the performance requirements of drilling fluid for drilling through salt rock formations and is suitable for gas storage drilling engineering and petroleum drilling engineering. Background technique [0002] Saturated brine drilling fluid has high salinity, so it has strong anti-fouling ability and good anti-collapse ability, especially when it encounters salt layer, salt-gypsum layer or shale layer with gypsum, it has a good ability to inhibit the dissolution of salt , Inhibit the ability of salt-gypsum layer to absorb water and expand, and at the same time have a strong inhibitory effect on the hydration expansion and dispersion of clay in the formation, and when drilling into a salt-gypsum layer, it can minimize the dissolution of salt and avoid "big belly" "The formation of wellbore an...

AI Technical Summary

Problems solved by technology

[0003] For the drilling of salt-cavern gas storage wells, due to the technical difficulties of calcareous mudstone, gypsum mudstone and nearly 200m of pure salt rock in the formation after the second opening, in the drilling construction process of such formations, ordinary freshwater drilling fluid is basically It cannot be applied, even if the saturated brine drilling fluid is transformed and maintained improperly, the well wall will collapse and block, which will bring great difficulties to drilling construction

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