By Hedong Sun
In fresh years, construction decline-curve research has turn into the main customary software within the for oil and gasoline reservoir construction research. even if, such a lot curve research is completed via laptop this day, selling a "black-box" method of engineering and leaving engineers with little historical past within the basics of decline research. Advanced construction Decline research and Application begins from the fundamental thought of complicated construction decline research, and punctiliously discusses numerous decline tools, equivalent to Arps, Fetkovich, Blasingame, Agarwal-Gardner, NPI, temporary, lengthy linear circulation, and FMB. a pragmatic systematic advent to every procedure is helping the reservoir engineer comprehend the actual and mathematical versions, remedy the sort curves and fit up research, research the techniques and examples, and reconstruct all of the examples via hand, giving method to grasp the basics at the back of the software program. An appendix explains the nomenclature and significant equations, and as an additional bonus, on-line desktop courses can be found for obtain.
- Understand the main finished and present record of decline equipment, together with Arps, Fetkovich, Blasingame, and Agarwal-Gardner
- Gain professional wisdom with rules, tactics, real-world circumstances and box examples
- Includes on-line downloadable laptop courses on Blasingame decline sort curves and normalized pseudo-pressure of gasoline wells
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Additional info for Advanced Production Decline Analysis and Application
55) Substitute Eq. 54) into Eq. 56) In the case of keeping the current constant pressure production mode unchanged, as long as the relative permeability curve Kro(Sw) ∼ Sw of the well is known, the different forms of rate decline equations can be developed based on Eq. 54) and Eq. 56). 57) Substituting it into Eq. 58) 44 Advanced Production Decline Analysis and Application Based on Eq. 23), integrating Eq. 59) Substituting Eq. 57) and Eq. 59) into Eq. 60) Eq. 60) is the exponential decline equation.
7 Decline Equation of Gas Well in Volumetric Gas Reservoir—Constant Pressure Production The flow equation of real gas is linearized by introducing pseudo-pressure , as given below. 93) Differentiating Eq. 89), Eq. 90), and Eq. 96) Combining Eq. 94), Eq. 95), and Eq. 97) Integrating Eq. 100) That is, the decline law of gas well in a volumetric gas reservoir producing at a constant pressure conforms to exponential decline, and the decline rate is influenced by factors like OGIP, geometry, and formation pressure.
63) Substituting Eq. 63) into Eq. 64) Based on Eq. 10), integrating Eq. 65) Substituting Eq. 65) into Eq. 67) Eq. 70) Substituting Eq. 70) into Eq. 71) Let b=− 1 N Eq. 71) is converted to qi q= 1b (1 + bDi t ) Eq. 72) is the hyperbolic decline equation. 73) Substituting Eq. 73) into Eq. 74) Integrating Eq. 75) Substituting Eq. 75) into Eq. 76) Obviously, α a1 e − b1Sw = qi Let Di = a1 b1 α B − b1Swc e Vϕ Eq. 77) Eq. 72) is the harmonic decline equation. 78) Arps Decline Curves Analysis 47 Differentiating Eq.
Advanced Production Decline Analysis and Application by Hedong Sun