Killington Vt, Tubing

ANALYSIS OF BALANCE OF MATERIALS

The Material Balance Equation provides an overview of the characteristics of a site from the study of fluids present and their distribution in the structure of the system. However, to make use of this tool is necessary to have prior information and data from the reservoir at the same time, should be based on solid and reliable. Among the conditions that must be taken into account in applying the material balance equation successfully two conditions that must satirfacerse e qu necessarily. First you must have an adequate collection of data (production / Pressure vs Time / PVT), both qualitatively and quantitatively, otherwise the technique can be quite meaningless. The second condition is that it should be possible to define a trend average pressure decline for the system under study.

parameters that are possible to define from EBM are original oil in place, Original Gas In Place, fractional contribution of each mechanism present in the reservoir production and analysis of uncertainties. Considering the complete equation of the equation of material balance involubrados parameters can be divided into the following categories: should be''known'':

• Np Rp
Wp
• Cw Swc
• Bw

Potentially ''unknown''

• N
• We
• P
• Bp, Rs, Bg
• m Cf

known scores of 6 and 8 reveals the perennial potentially unknown dificultal presented not only with the material balance equation but on the whole issue of Reservoir Engineering. There are many very few equations for number of unknowns for which must be solved. The numerical simulation not solve this condition, limits the amount of possible unknowns that appear in each of the equations: geometry, porosodad, permeability, which is a serious issue in reservoir engineering, uncertainty can only increase its appeal, making emphasis on observation and trial and numeracy not only because there can be a unique mathematical solution to problems. Considering further the "known facts" and "unknown." Predicting the behavior of a reservoir as a function of time can be divided into 3 phases:

• field behavior: This phase requires use of EBM in a predictive manner, intended to be estimate the cumulative production of oil and gas-oil ratio IM (RGP) versus
  reservoir pressure depletion.

• well Behavior: This phase generates the individual behavior of each well in the extent to which advances the exhaust pressure.
  

• Relationship reservoir behavior over time: This phase, data from the reservoir and wells are linked over time, considering amounts and rate of production of each of them.

Among one of the methods of prediction of recovery and behavior future growth of a reservoir is located is:

SHILTHUIS METHOD

Conditions:

• The field strength must be

• The site must be saturated, so it is assumed that has no initial gas cap and therefore the mechanism of the reservoir is Push Solution Gas.

Procedure:

1. determine the number of pressure ranges and pr ESSIONS to which it will work.
2. Assuming a value of ΔNp / N
3. Calculate the cumulative oil production Np / N sum of all increases in production.
4. determine the liquid saturation pressure of interest.
5. determine the value of the ratio of permeabilities Kg / Ko.
6. Calculate gas ratio - instant oil (Ri): The Ri is defined as the ratio of produced gas and oil produced in a given time during the production of a reservoir.
7. Calculate the increase in gas production
8. Calculate the cumulative gas production to pressure d interest.
9. Calculate the ratio gas - oil production (Rp = Gp / Np).
10. With the values \u200b\u200bof Rp and Np / N to check if the ΔNp / N assumption was correct (score between 0.99 and 1.01)
11. If the value is correct can continue, otherwise it must return to step # 2.
12. Determine the value of Np from Np / N assumed.
13. Go to next pressure value and start at step 1.

Bibligrafía
- Villa Joseph. "Materials Balance in oil with Dissolved Gas Central University of Venezuela 2003-2007 Version