Drilling fluid completion fluid for increasing drilling speed and preparation method of drilling fluid completion fluid

Abstract

The invention relates to a drilling fluid completion fluid for increasing drilling speed and a preparation method of the drilling fluid completion fluid. The drilling fluid completion fluid is prepared from the following components in parts by weight: a continuous liquid phase, 0.2-1 part of a cleaning and lubrication fast drilling agent, 0.1-1 part of anhydrous sodium carbonate, 2-3 parts of clay, a tackifier, a filtrate reducer, 0-10 parts of an inhibitor, 0-1 part of a surfactant, 1-3 parts of a plugging agent and 0.1-10 parts of a weighting agent, wherein fresh water is used as the continuous liquid phase; sodium bentonite is used as the clay; lignite resin, or a sulfonate copolymer filtrate reducer, or sulfomethyl phenol formaldehyde resin is used as the filtrate reducer; super-fine calcium carbonate or expanded graphite is used as the plugging agent; barite or manganese tetraoxide is used as the weighting agent. The drilling fluid completion fluid disclosed by the invention has the advantages that the drilling fluid completion fluid can keep a low solid-phase content under the high density conditions, has excellent capacities of cleaning and wetting a mud-proof drum, preventing water blocking damage, resisting temperature and salt, lubricating to reduce frictional resistance, inhibiting and preventing collapse, and plugging, and can be used for stabilizing the wall of a well, increasing initial water loss of the drilling fluid, reducing a chip hold-down effect and increasing the drilling speed.

Description

technical field [0001] The invention relates to a drilling fluid completion fluid and a preparation method thereof, in particular to a drilling fluid completion fluid for increasing drilling speed and a preparation method thereof. Background technique [0002] With the continuous expansion of the field of oil and gas exploration and development, the formations encountered in the drilling process are becoming more and more complex, and the wells are getting deeper and deeper. The complex situation in the downhole is even more unpredictable, and the difficulty of handling is increasing. When deep wells are drilled under high pressure and encounter hard formations such as mud shale, soft shale, sticky shale and expansive shale, such formations are easy to hydrate and expand, leading to complex downhole accidents. The problem of wellbore instability in the section is particularly prominent. Especially the drilling fluid density is greater than 1.60g / cm 3 Above, the dynamic...

AI Technical Summary

Problems solved by technology

[0006] The current research is mainly limited to the development of a single drilling fluid speed-enhancing treatment agent, mainly by improving the drilling fluid lubricity or by improving the drilling fluid inhibition to obtain drilling speed; after adding drilling fluid, it is easy to foam, especially after high temperature The foaming is serious; manufacturing Monomers are mainly derived from mineral oil and vegetable oil. Mineral oil has great environmental pollution, high fluorescence level affects geological logging, and vegetable oil has a high cost; it is generally used in the field at about 3000m, with a density of 1.6g / cm 3 the following well

Lack of optimized drilling fluid and completion fluid technology formula with significant speed-up effect, especially the lack of rapid drilling fluid and completion fluid technology suitable for use in high-density environments

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