HYDPRO - Drilling Hydraulics Model

• HYDPRO:Drilling Hydraulics Model (English)
• HYDPRO: Modelo hidráulico de perforación (Española)
• HYDPRO: 钻井水力学模型 (中文)

Q1. When I perform a hydraulics run, the hole cleaning graphs do not populate. How do I get hole cleaning graphs in the outputs?
To calculate the hole cleaning, select the Advanced (Three-layer) model in the Calculation Setup window. The ROP in the Hydraulics tab must also be greater than 0.

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Q2. What do the “RPM effect on hydraulics”, “Eccentricity effect on hydraulics” and “Tool joint effect on hydraulics” options do?
These options affect the hydraulics calculations by accounting for the flow of fluid through restrictions, around and across the tool joint, and in an eccentric annular space. These calculations are complicated, and become even more so with rotation. All the calculations are based on empirical formulas. Any discrepancies, if any, between prediction and field data can give useful insights into the effect of RPM, Eccentricity and tool joint.

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Q3. What causes HYDPRO calculation time to increase?
The hydraulics sensitivity analysis can dramatically increase the calculation time, especially when all of the sensitivities are selected.
Surge/swab calculations
The three-layer model uses the iteration method to find the cuttings bed height. It takes the longer to calculate than the API method.
To improve the speed,

• Don’t run the hydraulic sensitivity every time.
• Change the calculation interval to a larger value. The calculation interval defines the bit depth locations at which the pressure profile calculation is conducted. Such as If the calculation interval is set to 500 ft, the program will calculate the hydraulics profile when the bit moves every 500 ft.

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Q4. What is the difference between ECD and EMW in Report table in Output Window?
EMW: Equivalent mud weight. It includes the cuttings contribution.
EMW = cuttings density * cuttings concentration + mud weight * (1 – cuttings concentration)
ECD: Equivalent circulation density. It includes the annulus frictional pressure loss.
ECD = EMW + annulus frictional pressure loss/0.052/TVD.
The pressure at bottom is greater than the pressure at surface, but the ECD at bottom might be the same as it at surface.

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Q5. Is input setup for calculation matching different in HYDPRO and MUDPRO⁺?
The mathematical model in HYDPRO and MUDPRO⁺ are the same. If the inputs are equal, the results should be as well. Differences in the survey/wellpath and small rounding differences in the background of the calculations are likely to occur.
We recommend the calculations between HYDPRO and MUDPRO⁺ with ECD and PP differences of ≤ 3 % or less than ± 0.3 ppg be considered a match.
Please refer to the .pdf file below for detailed explanation.
HYDPRO and MUDPRO⁺ Hydraulics Matching Explanation

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Q6. How does survey data differ in HYDPRO and MUDPRO⁺?
HYDPRO allows user to input detailed survey data, while MUDPRO⁺ uses the MD and TVD from all of the daily reports. It allows HYDPRO surveys to contain more depth entries and therefore often has a more accurate well path for the simulation.
Impact of the survey data tends to be small in PVI’s experience. If the MD and TVD values in MUDPRO⁺ match the survey data in HYDPRO, the results from both software will be close.
Please refer to the .pdf file below for detailed explanation.
HYDPRO and MUDPRO⁺ Hydraulics Matching Explanation

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Q7. How do the advance options (ROP, RPM, Eccentricity, Tool Joint Consideration) effect HYDPRO/MUDPRO⁺?
Please refer to the .pdf file below for detailed explanation.
HYDPRO and MUDPRO⁺ Hydraulics Matching Explanation

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Q8. Do I need to turn off Backpressure in HYDPRO for calculation matching to MUDPRO⁺?
MUDPRO⁺ does not consider backpressure, so it needs to be turned off in HYDPRO when comparing the ECD and pump pressure calculations.
Please refer to the .pdf file below for detailed explanation.
HYDPRO and MUDPRO⁺ Hydraulics Matching Explanation

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