METHOD OF DOWNHOLE CHARACTERIZATION OF FORMATION FLUIDS, MEASUREMENT CONTROLLER FOR DOWNHOLE CHARACTERIZATION OF FORMATION FLUIDS, AND APPARATUS FOR DOWNHOLE CHARACTERIZATION OF FORMATION FLUIDS
First Claim
1. A measurement controller for downhole characterization of formation fluids which controls a downhole tool,said downhole tool including a flowline for flowing said formation fluids capable of isolating a quantity of said formation fluids in a portion thereof;
- and a pump unit for depressurizing the isolated formation fluid, comprising;
a rough value estimation unit which estimates a rough value of a bubble point pressure of said isolated formation fluids; and
a speed controller which controls the depressurizing speed of said pump unit such that said isolated formation fluids are depressurized at a first speed to a certain pressure which is a predetermined value higher than said estimated rough value, and at a second speed which is slower than said first speed in order to measure a precise value of the bubble point pressure.
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Abstract
A downhole characterization apparatus for formation fluids is provided. The apparatus comprises a downhole tool including a flowline for flowing the formation fluids capable of isolating a quantity of the formation fluids in a portion thereof; and a pump unit for depressurizing the isolated formation fluids; and a measurement controller which controls the downhole tool. The measurement controller includes a rough value estimation unit which estimates a rough value of the bubble point pressure of the formation fluids; and a speed controller which controls the depressurizing speed of the pump unit such that the isolated formation fluids are depressurized at a first speed to a certain pressure which is a predetermined value higher than said estimated rough value, and the isolated fluids are depressurized at a second speed which is slower than said first speed in order to measure a precise value of the bubble point pressure.
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Citations
16 Claims
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1. A measurement controller for downhole characterization of formation fluids which controls a downhole tool,
said downhole tool including a flowline for flowing said formation fluids capable of isolating a quantity of said formation fluids in a portion thereof; - and a pump unit for depressurizing the isolated formation fluid, comprising;
a rough value estimation unit which estimates a rough value of a bubble point pressure of said isolated formation fluids; and a speed controller which controls the depressurizing speed of said pump unit such that said isolated formation fluids are depressurized at a first speed to a certain pressure which is a predetermined value higher than said estimated rough value, and at a second speed which is slower than said first speed in order to measure a precise value of the bubble point pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- and a pump unit for depressurizing the isolated formation fluid, comprising;
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9. A downhole characterization apparatus for formation fluids, comprising:
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a downhole tool including a flowline for flowing said formation fluids capable of isolating a quantity of said formation fluids in a portion thereof; and
a pump unit for depressurizing said isolated formation fluids; anda measurement controller which controls said downhole tool, said measurement controller including, a rough value estimation unit which estimates a rough value of the bubble point pressure of said formation fluids; and a speed controller which controls the depressurizing speed of said pump unit such that said isolated formation fluids are depressurized at a first speed to a certain pressure which is a predetermined value higher than said estimated rough value, and said isolated fluids are depressurized at a second speed which is slower than said first speed in order to measure a precise value of the bubble point pressure. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification