SU1373799A1 - Method of determining density of flushing fluid - Google Patents

Description

(21) 4104660 / 23-03

(22) 05/26/86

(46) 02.15.88. Bul № 6

(71) All-Union Scientific Research and Design Institute of Geophysical Research, Testing and Monitoring of Oil and Gas Exploration Wells

(72) A.I.Baryshnikov

(53) 622.241 (088.8)

(56) USSR author's certificate 407037, cl. E 21 B 47/10, 1971.

USSR author's certificate 901479, cl. E 21 B 47/00, 1980.

(54) METHOD FOR DETERMINING THE DENSITY OF WASHING LIQUID

(57) The invention relates to the field of drilling. The purpose of the invention is to increase the accuracy of determining the density of the drilling fluid in the drilling process. A certain volume of standard fluid with a known density is pumped into the well. The pressure in the injection line is determined before and after the injection of the reference fluid. The average density of the flushing fluid throughout the well is determined by the formula V SL + (P F) / () where y is the density of the flushing fluid in the well, g / cm; i, - density of the reference fluid, g / cm jft () - pressure difference in the injection line before (P) and after (,) injection of the reference fluid, kg / cm; V is the volume of the reference fluid pumped into the well; F is the area of the internal cross section of the drill string, see The method allows to control and measure the density by ground-based means in a continuous mode, without stopping the drilling. This reduces costs when making measurements. 1 il.

(L

with

00

with

four..., ,

ya

where is the density g / cm;

Mud in the well,

The invention relates to the measurement of the density of liquid media in wells during drilling,

The purpose of the invention is to improve the accuracy of determining the density of the industrial fluid during drilling.

The drawing shows the layout of the wellhead equipment for implementing a method for determining the density of a flash fluid.

The scheme includes a measuring vessel with a reference fluid 1, connected by means of an injection line to a pump 2, a pressure gauge 3, a drillstring 4, and a well 5.

The determination of the density of industrial fluids by the method is carried out as follows.

When the drilling process is stopped for a short period of time, a certain volume of reference fluid I (for example, process water or high-quality flushing fluid) with a known density is pumped at the required frequency, the pressure in the discharge line is fixed by means of a pressure gauge 3 before and after pumping the reference fluid, the difference in readings of the manometer before and after the injection of the reference fluid, determine the area of the internal channel of the drill string 4 and determine the average density of the mud throughout the well Formula

4P F

density

reference fluid

lr

 (РР,) - pressure difference in the injection line before (Р) and after (Р)

liquor, kg / cm;

V t volume pumped into the well

3

reference fluid, m;

F is the area of the internal section

drill string, see. The invention allows to monitor and measure the density of ground pumping of this

mi means in a continuous mode, do not stop the process of drilling, and thus creates reliability and one-, tivnost control one of the most important parameters of the pancreas.

Transferring the measurement of the density of the pancreas to the surface is economically more profitable, since the cost of ground-based measuring instruments is significantly lower than the corresponding means in the deep-seated scientific research institute.

The difference between the invention and the currently widely used method of determining the density of the pancreas using hydrometers is measuring and monitoring the pancreas density in the whole well, and not just in a single sample taken from the mouth of the well.

Claims (1)

Invention Formula The method of determining the density of the flushing fluid, which consists in measuring the hydrostatic pressure of the fluid, characterized in that, in order to improve the accuracy of determining the density of the fluid during the drilling process, a certain volume of a reference fluid with a known density is pumped into the well, the pressure in the injection line is recorded before and after pumping the reference fluid, and the density of the flushing fluid in the well is determined from the expression 0 five 0  Y + Well Well yr f   Well then. v where 5 "density of industrial fluid in the well, g / cm; reference fluid density, g / cm; pressure difference in the injection line before (P) and after (Pj) injection of the reference fluid into the well, kg / cm; volume of reference fluid pumped into the well, m; the area of the internal channel -. la drillstring, see W. Gzh l P - (P, -P,) Well F / /