Abstract
Aiming at efficiently and reliably controlling the intelligent sliding sleeve to open and close from the surface, a bypass downlink system is proposed without influencing the current stimulation equipment and process. A mathematics model based on the fluid hammer model and the method of characteristics is established to analyze the characteristics of the downlink system and validated by the experimental and field results. According to simulation results, the pressure change of the wellbore due to valve opening increasing or decreasing is coincident with the exponential expression. The expression contains three coefficients, which are the high pressure, the low pressure, and the system constant. The system constant is relative to the volume of the wellbore and the steady-state pressure. According to the characteristics of the pressure wave in the cased wellbore, digital base-band transmission is adopted for sending the pressure signal. A float matching decode method is proposed based on these characteristics and validated by the simulation results. The simulation results also indicate that the float matching decode method has high transmission efficiency and a low bit error rate. It can adapt to complex conditions of stimulation treatment. The work of this article can improve the efficiency and reliability of controlling the intelligent down-hole sliding sleeves.
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Abbreviations
- \(p_{c}\) :
-
Is the pressure value with time;
- \(P_{f}\) :
-
Is the steady-state pressure value;
- \(P_{i}\) :
-
Is the initial pressure value;
- \(\tau _{0}\) :
-
Is the system constant;
- \(P\) :
-
Is the pressure;
- \(P_{0}\) :
-
Is a known pressure loss;
- \(P_{{{\text{in}}}}\) :
-
Is the pressure upstream of the valve;
- \(P_{{{\text{out}}}}\) :
-
Is the pressure downstream of the valve;
- \(Q\) :
-
Is the displacement;
- \(Q_{0}\) :
-
Is a known displacement;
- \(Q_{L}\) :
-
Is the leakage volume;
- \(Q_{v}\) :
-
Is the volume rate of the valve;
- \(d_{h}\) :
-
Is the hydraulic diameter of the wellbore;
- \(f_{{{\text{lan}}}}\) :
-
Is the Fanning friction factor of laminar;
- \(f_{{{\text{turb}}}}\) :
-
Is the Fanning friction factor of turbulence;
- \(t_{c}\) :
-
Is the time to close the throttle valve;
- \(\tau _{w}\) :
-
Is the average value of the shear stress on the wellbore;
- \(\Delta P\) :
-
Is the pressure difference between wellbore and formation;
- \(A\) :
-
Is the cross-section of the wellbore and pipe;
- \(K\) :
-
Is the leakage coefficient;
- \(g\) :
-
Is the gravity acceleration;
- \(m\) :
-
Is the coefficient factor of the control valve;
- \(p\) :
-
Is the pressure with time;
- \(t_{c}\) :
-
Is the relative time of valve closing or opening;
- \(t\) :
-
Is the time;
- \(v\) :
-
Is the average velocity across the wellbore cross-section;
- \(z\) :
-
Is the axial coordinate of the wellbore and pipe;
- \(\rho\) :
-
Is the fluid density;
- \(\tau\) :
-
Is the opening of the throttle valve
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Acknowledgements
Supported by Open Fund (PLC 2020010) of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Chengdu University of Technology), I would like to express my gratitude to Reviewers, Southwest Oil and Gas Field Company, and those who helped me during the writing of this thesis.
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XW contributed to the conception of the study; XH contributed to the field fracturing data acquisition and analysis; YF contributed to the literature research; JZ performed the model validation; PC helped perform the analysis with constructive discussion.
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Wang, X., Huang, X., Fu, Y. et al. Model Investigation on Intelligent Sliding Sleeve Downlink System Based on Pressure Waves. Arab J Sci Eng 47, 11171–11185 (2022). https://doi.org/10.1007/s13369-021-05857-4
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DOI: https://doi.org/10.1007/s13369-021-05857-4