Measurement method for base fluid density of organic salt drilling fluid or well completion fluid

Abstract

The invention discloses a measurement method for the base fluid density of organic salt drilling fluid or well completion fluid. The method comprises the following steps that 1, base fluid is prepared, wherein the organic salt drilling fluid or the well completion fluid is filtered by using a medium-pressure filtration instrument, and prepared filtrate is the organic salt drilling fluid or the well completion fluid; 2, a mass-volume method is adopted for measuring the base fluid density of the organic salt drilling fluid or the well completion fluid, a microscale sample injector is used for measuring the base fluid volume of the organic salt drilling fluid or the well completion fluid, an analytical balance is used for measuring the base fluid mass of the organic salt drilling fluid or thewell completion fluid, and the base fluid density of the organic salt drilling fluid or the well completion fluid is obtained through a formula that rho is equal to the specific value of m to V; thecontent of organic salt in an organic salt drilling fluid or well completion fluid system can be accurately assessed, and a basis is provided for daily maintenance of drilling fluid or well completionfluid.

Description

technical field [0001] The invention belongs to the field of drilling in oil and gas fields, and in particular relates to a method for measuring the density of a drilling and completion fluid base fluid. Background technique [0002] Organic salt drilling fluid or completion fluid is an ideal system to solve the "three highs and one strong" (high temperature, high density, high salt, strong dispersion) well drilling and completion problems. It has the characteristics of "double protection" (protecting the environment and oil and gas layers), integrated drilling and completion fluids, and all treatment agents are non-toxic, harmless, non-corrosive, and non-fluorescent. It is suitable for all well types and is conducive to exploration and discovery. It is widely used in Domestic and international drilling markets. The base fluid density of organic salt drilling fluid or completion fluid refers to the density of filtrate prepared by medium pressure filter loss instrument. The...

AI Technical Summary

Problems solved by technology

When the organic salt content is too low, it will cause poor system inhibition, water-sensitive mudstone hydration dispersion slurry, hard and brittle shale hydration expansion spalling wellbore instability, and the increase of solid phase will affect the rheological properties

When the organic salt content is too high, the cost of the system will increase, and the downhole accidents will be complicated due to the saturated crystallization of dissolved salts

Therefore, the content of organic salts in organic salt drilling fluid or completion fluid directly affects the formulation of maintenance measures for drilling and completion fluids during drilling. After long-term research, it has been found that the density of organic salt drilling fluid or completion fluid base fluid is higher than that of organic salts. A means of characterization of organic salt content, the accuracy of its determination affects the correct judgment of organic salt content in the system, thus affecting the formulation of reasonable maintenance and treatment measures, economical input costs

Conventional density meters require a large sample volume, at least 100mL, and the preparation of the base fluid takes a long time. For high-density mud, it takes hours or even days, and the density cannot be measured in real time. Therefore, the density meter cannot be used during drilling. Real-time monitoring, and real-time maintenance of drilling and completion fluids

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