Drilling fluid for ultra deep well

Abstract

The invention relates to a drilling fluid for an ultra deep well, which is used in the ultra deep well drilling operation in an oil and gas field and solves the problems that the drilling fluid required for ultra deep well drilling has extremely high density and poor rheological property and wall-building property and can not be coordinated. The technical scheme is as follows: the drilling fluid is prepared from the following raw materials: 50-60g of sodium bentonite, 1.5-3g of hydrophobically associated polyacrylamide, 25-35g of sulfomethylated phenol-formaldehyde resin, 25-35g of sulfonated lignite resin, 25-35g of sulfomethylated lignite, 5-10g of asbestos, 150g of sodium chloride NaCl, 1200-1600g of barite powder, 300-400g of sub-micron barium sulfate, NaOH having a mass percent concentration of 40%, and 1000g of tap water, wherein the NaOH is used to regulate the pH value of the system to 10. The preparation method comprises the following steps: adding the tap water and the sodium bentonite, sequentially adding the above treating agents while stirring at a high speed, regulating the pH value of the system to 10, and finally adding a mixed weighting agent. The drilling fluid provided by the invention has better rheological property and fluid-losing/wall-building performance, low mud cake expandability, high strength and low stratum pollution level, and can be used for ultra deep well drilling.

Description

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AI Technical Summary

Benefits of technology

This new product helps improve the performance of deep bore holes during oil exploration or other applications that require long periods of time for drillers down into deeper areas without causing damage from excessive pressure on sensitive equipment used at different stages of production. It also reduces environmental concerns associated with traditional methods such as use of chemicals like caustic soda solution while still being effective even when faced with challenging conditions (such as swelling clay).

Problems solved by technology

Technological Problem addressed in this patents relates to developing an effective drill bit design solution called 3SUPHURAZOLE DSM (Super High Concentration Drilling Fluid) due to their excellent balance among various technical features such as viscosities, solubility, resistance against borehole walls, shear force generation caused by hydrodynamic interactions, etc., while maintaining strong bonding ability towards hydrocarbon shale movements without losing integrity over long periods of use.

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