HL-FFQH environment-friendly drilling fluid system and preparation method thereof

Abstract

The invention provides an HL-FFQH environment-friendly drilling fluid system and a preparation method thereof. The drilling fluid system is prepared from the following raw materials: water, bentonite,anhydrous sodium carbonate, an environment-friendly coating agent, an environment-friendly filtrate loss reducer, a bionic liquid lubricant, a bionic wall stabilizing agent, an environment-friendly inhibition and anti-collapse agent, a bionic nano plugging agent, an environment-friendly film forming agent and an environment-friendly diluting agent. The preparation method comprises the following steps: adding the bentonite into distilled water, and stirring and mixing; then adding the anhydrous sodium carbonate, sufficiently and uniformly stirring and curing; sequentially adding the environment-friendly coating agent, the environment-friendly filtrate loss reducer, the bionic liquid lubricant, the bionic wall stabilizing agent, the environment-friendly inhibition and anti-collapse agent, the bionic nano plugging agent, the environment-friendly film forming agent and the environment-friendly diluting agent and uniformly stirring to obtain the environment-friendly drilling fluid system.By adopting the HL-FFQH environment-friendly drilling fluid system and the preparation method thereof, mud is prevented from being dispersed and expanded at a mud shale section; the HL-FFQH environment-friendly drilling fluid system has good wall building performance, also has a strong rock fragment carrying capability and is used for effectively washing a wellbore; complicated accidents in a welldrilling process are avoided and the well drilling quality and efficiency are improved.

Description

technical field [0001] The invention relates to a petroleum drilling fluid system, in particular to an environment-friendly drilling fluid system. The invention also relates to a preparation method of the environment-friendly drilling fluid system. Background technique [0002] With the current oil and gas development gradually shifting to shale gas and shale oil, etc., the frequent drilling of mud shale intervals during drilling will cause hydration and expansion of mud shale, resulting in the deterioration of drilling fluid rheology, thixotropy enhancement, and filtration loss. The amount increases and the mud cake thickens, which in turn leads to drilling accidents. At present, most of the inhibitory drilling fluid systems on the market are composed of toxic and harmful treatment agents, which are extremely unfavorable to the environment and reservoirs. The optimization, performance improvement and greening of the drilling fluid system are the basis for ensuring safe, f...

AI Technical Summary

Problems solved by technology

Among them, there are too many shale stabilizers, the economic cost is high, and some products are not environmentally friendly

CN104946215A discloses a method for preparing drilling fluid by utilizing guar gum fracturing fluid wastewater, which uses the waste water produced by fracturing operations for secondary utilization, and utilizes the characteristics of low molecular weight guar gum and ammonium salt contained therein, although some materials are environmentally friendly products , but its performance is not good, and there is still a certain risk in the use of long shale sections

CN106753286A discloses a high-viscosity and low-solids environment-friendly drilling fluid and its preparation method, which is composed of clear water, polyanionic cellulose, xanthan gum, shale inhibitor, emulsified pitch, phenolic resin, etc., and the system uses many raw materials It is an environmentally friendly product with good conventional performance, but its performance on shale inhibition indicators is not good, and a complete and effective drilling fluid system has not been formed. Its compatibility and addition amount are not specified, and it is difficult to be used in specific target wells

[0005] The above technologies have not given any guidance on how to make the drilling fluid system suppress the dispersion and expansion of soil in the shale section, have good wall-building properties, and at the same time have a strong ability to carry cuttings, effectively clean the wellbore, and avoid complex drilling accidents. Specific Guidance Program

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