A kind of composite brine drilling fluid

A technology of brine drilling fluid and polyanion, which is applied in the field of drilling fluid, can solve the problems of not being able to meet the drilling requirements of normal pressure-low pressure reservoirs, and achieve the effects of easy operation and maintenance, good rheology, and low solid content
CN103881669BActive Publication Date: 2016-08-17CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2016-08-17

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Abstract

The invention discloses a compound brine drilling fluid which comprises the following components in parts by weight: 100 parts of water, 0.12-0.17 parts of sodium hydroxide, 0.15-0.25 parts of polyanionic cellulose, 0- 0.3 parts of carboxymethyl cellulose, 2-5 parts of calcium carbonate, 0.8-1.2 parts of sulfonated tannin, 0.8-1.3 parts of graphite powder, 0-1 part of filtrate reducer A, 0.8-1.2 parts of filtrate reducer B, 2-10 parts of sodium formate, 3-15 parts of sodium chloride and 1.8-2.5 parts of potassium chloride. The composite brine drilling fluid disclosed by the invention has good inhibition effect on water-sensitive minerals in reservoirs and low harm to the permeability of reservoirs, is free of clay phase and low in the content of solid phase and hardly damages stratum. The composite brine drilling fluid has the advantages of good rheology, strong inhibition and lower cost; the site preparation process is simple, operation and maintenance are convenient and the composite brine drilling fluid can be effectively applied to protective drilling operations of low-porosity, low-pressure and low-permeability reservoirs.
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Description

technical field

[0001] The invention belongs to the technical field of drilling fluids, in particular to a composite brine drilling fluid. Background technique

[0002] Drilling fluid is the circulating flushing medium used in the hole during the drilling process. The main functions of drilling fluid are: cleaning the bottom of the well, carrying cuttings; cooling and lubricating the drill bit and drill string; balancing the side pressure of the rock on the well wall, forming a filter cake on the well wall, sealing and stabilizing the well wall; controlling the formation pressure; suspending cuttings and weighting agent; effective transmission of hydraulic efficiency; hydraulic breaking of rocks, etc. Drilling fluid can be divided into water-based drilling fluid, oil-based drilling fluid, gas-based drilling fluid, etc. according to the dispersion medium (continuous phase). Among them, the most widely used is water-based drilling fluid. Water-based drilling fluid is a sol-...

Claims

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