SU619626A1

SU619626A1 - Method of determining true gas content in drilling mud

Info

Publication number: SU619626A1
Application number: SU752164768A
Authority: SU
Inventors: Станислав Афанасьевич Алехин
Original assignee: Alekhin S
Priority date: 1975-07-21
Filing date: 1975-07-21
Publication date: 1978-08-15

Description

Изобретение относитс к бурению скважин , в-частности к способам контрол загазованностибурового раствора.The invention relates to the drilling of wells, in particular, to methods for monitoring the gas contamination of a drilling fluid.

Известен способ определени загазованности бурового раствора путем отбора проб бурового раствора на поверхности 1J.There is a known method for determining the gas content of a drilling fluid by sampling a drilling fluid on a 1J surface.

Недостатком способа вл етс то, что часть газа выходит из бурового раствора, в св зи с уменьшением давлени .The disadvantage of this method is that part of the gas comes out of the drilling fluid, due to the decrease in pressure.

Известен способ определени загазованности бурового раствора непосредственно у газопро вл ющего пласта путем изменени объема пробоотборной камеры и создани пониженного давлени до давлени насыщени газа в буровом растворе, причем по величине усилий определ ют процентное содержание .A known method for determining the gas contamination of a drilling fluid directly at the gas reservoir by changing the volume of the sampling chamber and creating a reduced pressure to the saturation pressure of the gas in the drilling fluid, the percentage being determined according to the amount of effort.

Недостатком способа вл етс сложность монтажа устройства, сложность осуш.ествлени операций по измерению загазованности и их периодичность.The disadvantage of this method is the complexity of installation of the device, the complexity of drying the measurement of gas content and their frequency.

Наиболее близким к предлагаемому вл етс способ определени истинной загазованности бурового раствора путем измерени количества газа в выход щем из скважины раствореГЯ.Closest to the present invention, there is a method for determining the true gas content of a drilling fluid by measuring the amount of gas in the effluent solution from the well.

Недостатком известного способа вл етс недостаточна точность измерений и их периодичность.The disadvantage of this method is the insufficient accuracy of measurements and their periodicity.

Цель изобретени - снижение затрат, обеспечение непрерывности и точности измерений .The purpose of the invention is to reduce costs, ensuring continuity and accuracy of measurements.

Это достигаетс тем, что в порции выход щего из скважины раствора определ ют величину остаточной загазованности и ввод т в нее газ при температуре и давлении, соответствующим забойным, а истинную величину загазованности выход щего раствора определ ют по сумме остаточной загазованности и дополнительно растворенного газа .This is achieved in that the residual gas content is determined in the portion of the solution leaving the well and gas is introduced into it at a temperature and pressure corresponding to the bottom hole, and the true value of the gas content of the output solution is determined by the sum of the residual gas content and additionally dissolved gas.

На чертеже показана схема реализации предлагаемого способа.The drawing shows the implementation of the proposed method.

Порцию бурового раствора, поступающего в скважину 1 и заведомо не загазованного , пропускают через камеру 2. оборудованную термопечью 3 и соединенную с источником 4 давлени .A portion of the drilling fluid entering the well 1 and which is obviously not gassed is passed through chamber 2. equipped with a thermal furnace 3 and connected to source 4 of pressure.

Claims

A portion of the drilling fluid leaving the well 1 with a partially dissolved gas is passed through chamber 5, equipped with a thermal furnace and connected to a pressure source. Tubes 6 and 7, which connect the pressure source to chambers 2 and 5, are equipped with gas flow sensors 8 and 9 connected to a differential flow meter 10. When the drilling mud flows into chamber 2 and 5, it is heated by means of thermal furnace -3 to the bottom hole temperature and introduced gas under pressure from the source 4, equal to the bottomhole pressure. Both samples are unevenly saturated with gas, since the solution coming out of the well may be partially Q gassed. The amount of additionally dissolved gas in the drilling fluid samples in chambers 2 and 5 is measured by sensors 8 and 9, respectively, and the flow difference is fixed by the flow meter 10. Equal pressures in both chambers are fixed by monometers 11 and 12. The method for determining the true gas content makes it possible, with continuity and accuracy of measurements, to increase the reliability of preventing accidental gas emissions. The method of determining the true gas content of a drilling fluid by measuring the amount of gas in a well coming out of a well, characterized in that, in order to reduce costs, to ensure continuity and accuracy of measurements, the residual gas content is determined in a portion of the well coming out of the well and the gas in it at a temperature and pressure corresponding to the bottomhole, and the true value of the gas content of the outgoing solution is determined by the sum of the residual gas content and additionally dissolved of gas, sources of the information received into account in the examination: US 1.Patent number 3731530, cl. 73-153, 1974.

2. US patent number 3813935, cl. 73-153, 1975.

3. Levit, A. M. Gas analysis and degassing of P oil, gas and coal deposits. M., “Nedra, 1974, p. 201 - 206.