Isokinetic sampling
First Claim
1. A method of sampling a multi-phase fluid stream comprising the steps of:
- sampling, with a sampling probe, a portion of the fluid stream;
measuring the flow rate QS of said sampled portion; and
measuring, independently of the sampling step, the total flow rate Q of the fluid stream,wherein the flow rate of the sampled portion is controlled according to the ratio of the flow rate of the sampled portion to the flow rate of the fluid stream, in order to obtain substantially isokinetic sampling of the fluid stream, andwherein the step of controlling the flow rate of the sampled portion is carried out continuously during the sampling process.
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Abstract
A method of sampling a multi-phase fluid stream is provided which comprises the steps of: sampling, with a sampling probe, a portion of the fluid stream; measuring the flow rate of said sampled portion; and measuring, independently of the sampling step, the total flow rate of the fluid stream, wherein the flow rate of the sampled portion is controlled according to the ratio of the flow rate of the sampled portion to the flow rate of the fluid stream, in order to obtain substantially isokinetic sampling of the fluid stream. The method may provide isokinetic sampling to an accuracy of 5% or less and preferably only samples a small portion of the fluid stream. The method has particular application for high rate condensate gas wells. A corresponding sampling system is provided which has particular application in the sampling of streams from well-heads. A flow conditioner for use with sampling methods and systems is also provided, the flow conditioner being a pipe section including: a swirl inducing section; a flow straightener; and an orifice plate.
56 Citations
19 Claims
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1. A method of sampling a multi-phase fluid stream comprising the steps of:
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sampling, with a sampling probe, a portion of the fluid stream; measuring the flow rate QS of said sampled portion; and measuring, independently of the sampling step, the total flow rate Q of the fluid stream, wherein the flow rate of the sampled portion is controlled according to the ratio of the flow rate of the sampled portion to the flow rate of the fluid stream, in order to obtain substantially isokinetic sampling of the fluid stream, and wherein the step of controlling the flow rate of the sampled portion is carried out continuously during the sampling process. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Sampling apparatus for sampling a multi-phase fluid stream, comprising:
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means for measuring the total flow rate Q of the fluid stream; a sampling probe for sampling a portion of said fluid stream; a meter for measuring the flow rate QS of said sampled portion, wherein the means for measuring the total flow rate is independent of the meter for measuring the flow rate QS of said sampled portion; and a controller adapted to continuously control the flow rate of the sampled portion according to the ratio of the flow rate of the sampled portion to the total flow rate of the fluid stream, in order to obtain substantially isokinetic sampling of the fluid stream. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification