Vogel’s IPR are a single-rates dating, plus the high sample speed is used to exhibit that it IPR

Vogel’s IPR are a single-rates dating, plus the high sample speed is used to exhibit that it IPR

Appropriate J to use within the Eqs. 6 and you will eight hinges on the brand new streaming bottomhole tension of the take to section. If your streaming bottomhole pressure are higher than the newest bubblepoint tension, then the better is feeling unmarried-phase circulate standards and you can J relies upon

Immediately following J is set toward decide to try criteria, it is accustomed determine the whole inflow performance curve both over and you may below the bubblepoint tension that have Eqs. seven and 8. The fresh composite IPR is just appropriate when the mediocre reservoir tension was greater than the brand new bubblepoint pressure.

Three-phase circulate

Wiggins [9] showed a simple-to-explore IPR for three-phase flow, which is similar in shape to help you Vogel’s IPR. It was predicated on a series of simulator knowledge. They output show similar to a couple of almost every other three-stage flow designs [8] [10] and that’s simpler to implement. Eqs. eleven and you will 12 provide the general three-phase IPRs for petroleum and liquid, respectively.


Dining table 1 gift ideas studies to own a good multipoint sample towards a creating oils well used to demonstrate the 2-phase IPR measures. The typical tank pressure because of it analogy is 1,734 psia.


To apply brand new IPR steps, receive sample guidance, that has production prices, streaming bottomhole pressures, and a quotation of the mediocre tank stress. The information obtained during the prominent tension drawdown may be used that have Eq. step one to eliminate on restriction oils-manufacturing speed.

The newest estimated limit petroleum manufacturing is actually 2,065 STB/D. This worth will then be used to guess the supply rates during the almost every other viewpoints out-of flowing bottomhole pressures to develop a complete inflow results contour. Again, Eq. step one would be rearranged to help you assess the supply price to own an excellent moving bottomhole tension out-of 800 psia.

Fetkovich’s IPR needs multiple attempt what to influence the brand new deliverability exponent n. Dining table 2 suggests the test studies open to plotting. The content is plotted toward an effective logarithmic chart, which is used to estimate the new slope of the greatest-fit straight line from studies. The brand new deliverability exponent letter is the inverse of your own hill. Just after n is set, Eq. 3 can be used to estimate the maximum oils development rates. Fig. 1 ‘s the spot of the research that displays a knowledgeable-complement straight-line has a mountain of just one.347 yielding an letter value of 0.743. The latest projected limitation petroleum creation rates try step one,497 STB/D, as Eq. 15 suggests.

As the limit rate try estimated, it is used in combination with Eq. step three so you’re able to guess manufacturing pricing from the other streaming bottomhole pressures to help you develop brand new inflow efficiency curve in a manner exactly like that showed which have Vogel’s IPR. For Fetkovich’s https://datingranking.net/scruff-review/ approach, the production speed was estimated are step 1,253 STB/D within a flowing bottomhole stress off 800 psia.

To apply the method away from Jones, Blount, and you will Glaze to this data place, Desk step 3 is actually wishing as well as the data plotted on an organize graph because the shown inside Fig. dos. An educated-match straight line produced a mountain out-of 0.0004 psia/(STB/D) dos , which is the turbulence coefficient b. The new intercept ‘s the laminar-flow coefficient which will be determined so you’re able to become 0.23 psia/STB/D. This type of viewpoints can be used within the Eq. 5 to search for the limit petroleum production speed of just one,814 STB/D when the flowing bottomhole pressure was 0 psig.

Which same relationships is utilized so you can guess the production price on other moving bottomhole challenges to produce the fresh inflow show bend. To own a flowing bottomhole pressure of 800 psia, the production rate is actually projected is step 1,267 STB/D.

Out of this example, each one of the three procedures produced additional beliefs into the limit oil design rates additionally the production rates at the an excellent flowing bottomhole pressure off 800 psia. As a result, production estimates will be influenced by the brand new IPR found in the brand new analysis, additionally the petroleum professional should be aware of that it question in the one research done.