[특허]Determining fluid properties from pressure, volume and temperature measurements made by electric wireline formation test

Determining fluid properties from pressure, volume and temperature measurements made by electric wireline formation test 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01N-007/00
출원번호	US-0490944 (1995-06-15)
발명자 / 주소	Yesudas Michael (Houston TX) Michaels John M. (Houston TX) Rafie Saeed (Houston TX) Shwe Than (Houston TX)
출원인 / 주소	Western Atlas International, Inc. (Houston TX 02)
인용정보	피인용 횟수 : 79 인용 특허 : 0

초록 ▼

A method of determining an amount of dissolved gas in a fluid sample is disclosed. The method includes hydraulically confining and expanding the sample while measuring pressure and volume. A first volume and pressure are determined at which the rate of change in pressure with respect to volume deviates from a linear relationship. A second volume and pressure at which continued expansion of the fluid causes substantially no change in pressure is determined. The first pressure and volume are extrapolated by the linear relationship to intersect an extrapolation from the second volume and pressure at no change in pressure, thereby determining a bubble point comprising a bubble point pressure and a bubble point volume. A third pressure corresponding to measured pressure of the fluid sample at the bubble point volume is determined. An extrapolated sample volume is determined at the third pressure by extrapolating the linear relationship from the bubble point to a sample volume along the linear relationship corresponding to the third pressure. A volume of gas dissolved in the fluid sample is determined by linearly scaling a difference between the bubble point volume and the extrapolated sample volume with respect to a difference between the second volume and the bubble point volume. In a preferred embodiment of the invention, the sample is withdrawn into a sample chamber in an electric wireline formation test tool having a means for measuring pressure and volume of the sample chamber.

대표청구항 ▼

A method of determining an amount of dissolved gas in a fluid sample, comprising the steps of: hydraulically confining said fluid sample; expanding said fluid sample while measuring pressure and volume of said fluid sample; determining a first volume and a first pressure at which a rate of change in said pressure with respect to said volume deviates from a linear relationship; determining a second volume and a second pressure at which additional expansion of said fluid sample causes substantially no change in said pressure of said fluid sample; extrapolating said first pressure and said first volume by said linear relationship so as to intersect an extrapolation of said second volume and said second pressure, said extrapolation of said second volume and said second pressure having substantially no change in pressure with respect to volume, thereby determining a bubble point, said bubble point including a bubble point pressure and a bubble point volume; determining a third pressure, said third pressure including said pressure of said fluid sample measured at said bubble point volume; determining an extrapolated sample volume at said third pressure by extrapolating said linear relationship from said bubble point to a sample volume of said linear relationship corresponding to said third pressure; and determining a volume of gas dissolved in said fluid sample by linearly scaling a difference between said bubble point volume and said extrapolated sample volume with respect to a difference between said second volume and said bubble point volume.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
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A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Determining fluid properties from pressure, volume and temperature measurements made by electric wireline formation test 원문보기

초록 ▼

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Determining fluid properties from pressure, volume and temperature measurements made by electric wireline formation test 원문보기

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