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Vogel’s IPR is actually a single-speed relationship, as well as the higher attempt price can be used to exhibit which IPR

January 3, 2023

Vogel’s IPR is actually a single-speed relationship, as well as the higher attempt price can be used to exhibit which IPR

The right J to utilize within the Eqs. six and you can 7 depends on the latest moving bottomhole pressure of test point. Whether your flowing bottomhole pressure was greater than the new bubblepoint pressure, then the really try experiencing single-stage flow standards and you can J depends upon

Shortly after J is determined into sample criteria, it’s regularly determine the complete inflow efficiency contour one another above and beneath the bubblepoint pressure having Eqs. 7 and you can 8. New substance IPR is relevant if average reservoir stress are more than the fresh new bubblepoint pressure.

Three-stage move

Wiggins [9] exhibited an easy-to-fool around with IPR for a few-phase flow, which is equivalent fit to Vogel’s IPR. It actually was centered on a number of simulator knowledge. They efficiency abilities the same as a couple of other about three-phase disperse activities [8] [10] which will be simpler to incorporate. Eqs. eleven and you can twelve supply the generalized about three-phase IPRs getting oils and you will drinking water, respectively.


Dining table 1 gifts data to have a great multipoint try on a promoting oil well-used to show the two-phase IPR procedures. An average reservoir stress for this analogy was 1,734 psia.


To make use of the brand new IPR strategies, receive try recommendations, which has creation prices, moving bottomhole pressures, and you will a quotation of your average tank pressure. The details obtained from the largest pressure drawdown may be used having Eq. step 1 to settle to the maximum petroleum-creation rates.

The latest projected restrict petroleum development is actually 2,065 STB/D. That it worth will then be used to estimate the supply rate at most other opinions away from moving bottomhole challenges to cultivate a complete inflow overall performance curve. Once more, Eq. 1 might be rearranged so you can estimate the production rates to possess a good moving bottomhole stress away from 800 psia.

Fetkovich’s IPR need several take to what to influence the latest deliverability exponent letter. Desk dos suggests the test studies available to plotting. The content is actually plotted towards an effective logarithmic graph, which is used in order to imagine the newest slope of the best-fit straight-line from study. The fresh deliverability exponent letter is the inverse of the slope. Just after n is determined, Eq. step three are often used to guess maximum oils development rate. Fig. 1 ‘s the patch of study that presents a knowledgeable-fit straight-line has actually a mountain of just one.347 producing a keen letter value of 0.743. The new estimated restrict oil production price are step 1,497 STB/D, as the Eq. fifteen suggests.

Because the restriction rate are estimated, it’s used in combination with Eq. 3 to help you estimate manufacturing costs at the other moving bottomhole demands to help you write the inflow overall performance curve in ways just like that displayed which have Vogel’s IPR. To possess Fetkovich’s means, the supply price is estimated to get step 1,253 STB/D at a flowing bottomhole stress from 800 psia.

To apply the procedure regarding Jones, Blount, and you can Glaze to that particular analysis lay, Desk step three are wishing and the investigation plotted on the a coordinate graph while the found during the Fig. dos. An educated-match straight-line yielded a mountain regarding 0.0004 psia/(STB/D) dos , which is the turbulence coefficient b. The fresh new intercept ‘s the laminar-flow coefficient that will be calculated to getting 0.23 psia/STB/D. These opinions can be used when you look at the Eq. 5 to determine the maximum petroleum creation speed of 1,814 STB/D if the streaming bottomhole pressure are 0 psig.

So it exact same matchmaking can be used to estimate the production speed during the other moving bottomhole demands to create the brand new inflow efficiency contour. To own a flowing bottomhole pressure away from 800 psia, the production price try estimated to-be step one,267 STB/D.

Out of this analogy, all the about three strategies yielded some other thinking towards the limitation oils design price additionally the creation rates in the a great flowing bottomhole tension regarding 800 psia. Consequently, manufacturing quotes is dependent on this new IPR found in the data, plus the oil professional should become aware of so it concern inside the any data performed.

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