Early Pack-Off Diagnosis in Drilling Using an Adaptive Observer and Statistical Change Detection

Willersrud, Anders; Imsland, Lars; Blanke, Mogens

doi:10.1016/j.ifacol.2015.08.028

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…We consider a recently developed simplified nonlinear model from that in for the dynamics of the well drilling system. The model has been shown by experiments to have acceptable fidelity level for calculating the non‐measured states and for parameter estimation . The nonlinear ODE model for the MPD system in Figure is given by

\frac{V_{d}}{β_{d}} {\overset{p}{true}}_{pump} (t) = q_{pump} - q_{bit} (t),

\frac{V_{a}}{β_{a}} {\overset{p}{true}}_{choke} (t) = - q_{choke} (t) - {\overset{V}{true}}_{a} + q_{bit} (t) + q_{res} + q_{back},

M_{a} {\overset{q}{true}}_{bit} (t) = p_{bit} (t) - p_{choke} (t) + F_{a} q_{bit}^{2} (t) - ρ_{a} g h_{bit},

M_{d} {\overset{q}{true}}_{bit} (t) = p_{pump} (t) - p_{bit} (t) - F_{d} q_{bit}^{2} (t) + ρ_{d} g h_{bit},

…”

Section: Managed Pressure Drilling Hydrolic Modelmentioning

confidence: 99%

Bottom hole pressure estimation and adaptive control in managed pressure drilling system

Hovakimyan

Kaasa

2016

Adaptive Control & Signal

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In the past decade, managed pressure drilling, a technology aiming at precise well pressure control, has been gaining increasing popularity and been a key enabler for some of the most challenging well drilling cases such as the offshore deep water well drilling. This paper attempts to solve two of the main challenges involved in the managed pressure drilling systems: first, the bottom-hole states measurements are updated at a low rate, which can be practically viewed as unmeasured and thus need to be estimated in real time for both monitoring and control purposes and second, the drilling process is subject to uncertainties including unknown system parameters (e.g., frictions and densities), unmodeled actuator dynamics, and noise, which require a robust adaptive controller for control of the bottom-hole pressure. Towards this objective, an integrated estimator and L 1 adaptive control scheme is proposed. The estimator provides estimation of the bottom-hole pressure and flow rate, based on the available measurements from the topside. The L 1 adaptive controller drives the bottom-hole pressure to the desired value following a reference model, which also handles the time delays in the input signal. The design is based on a recently developed nonlinear drilling model. The results demonstrate that the L 1 adaptive controller has guaranteed performance bounds for both the input and the output signals of the system while using the estimation of the regulated outputs. Simulation results covering different operational conditions verify the theoretical findings.

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\frac{V_{d}}{β_{d}} {\overset{p}{true}}_{pump} (t) = q_{pump} - q_{bit} (t),

\frac{V_{a}}{β_{a}} {\overset{p}{true}}_{choke} (t) = - q_{choke} (t) - {\overset{V}{true}}_{a} + q_{bit} (t) + q_{res} + q_{back},

M_{a} {\overset{q}{true}}_{bit} (t) = p_{bit} (t) - p_{choke} (t) + F_{a} q_{bit}^{2} (t) - ρ_{a} g h_{bit},

M_{d} {\overset{q}{true}}_{bit} (t) = p_{pump} (t) - p_{bit} (t) - F_{d} q_{bit}^{2} (t) + ρ_{d} g h_{bit},

…”

Section: Managed Pressure Drilling Hydrolic Modelmentioning

confidence: 99%

Bottom hole pressure estimation and adaptive control in managed pressure drilling system

Hovakimyan

Kaasa

2016

Adaptive Control & Signal

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“…Cutting particles are easy to accumulate in a horizontal wellbore, and cutting plugs might be formed when pump is stopped and tripping processes are conducted. Different from a cutting bed, a cutting plug fills the annulus at a certain length [32]. Fluid flow in tripping in and tripping out processes is affected by this particular accumulation of cutting particles.…”

Section: Introductionmentioning

confidence: 99%

Study on the Surge-Swab Pressure considering the Effect of the Cutting Plug in Shale Drilling

Tan

Zhang

et al. 2021

Geofluids

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Wellbore instability is a frequent problem of shale drilling. Accurate calculation of surge-swab pressures in tripping processes is essential for wellbore pressure management to maintain wellbore stability. However, cutting plugs formed in shale horizontal wells have not been considered in previous surge-swab pressure models. In this paper, a surge-swab pressure model considering the effect of cutting plugs is established for both open pipe string and closed pipe string conditions; In this model, the osmotic pressure of a cutting plug is analyzed. The reduction of cutting plug porosity due to shale hydration expansion and dispersion is considered, ultimately resulting in an impermeable cutting plug. A case study is conducted to analyze swab pressures in a tripping out process. The results show that, in a closed pipe condition, the cutting plug significantly increases the swab pressures below it, which increase with the decrease of cutting plug porosity and the increase of cutting plug length. Under the give condition, the swab pressure at the bottom of the well increases from 3.60 MPa to 8.82 MPa due to the cutting plug, increasing by 244.9%. In an open pipe string condition, the cutting plug affects the flow rate in the pipes and the annulus, resulting in a higher swab pressure above the cutting plug compared to a no-cutting plug annulus. The difference increases with the decrease of the porosity and the increase of the length and the measured depth of the cutting plug. Consequently, the extra surge-swab pressures caused by cutting plugs could result in wellbore pressures out of safety mud density window, whereas are ignored by previous models. The model proposes a more accurate wellbore pressure prediction and guarantees the wellbore stability in shale drilling.

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Drilling fault classification based on pressure and flowrate responses via ensemble classifier in Managed pressure drilling

Jiang

Liu

et al. 2020

Journal of Petroleum Science and Engineering

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Early Pack-Off Diagnosis in Drilling Using an Adaptive Observer and Statistical Change Detection

Cited by 6 publications

References 15 publications

Bottom hole pressure estimation and adaptive control in managed pressure drilling system

Bottom hole pressure estimation and adaptive control in managed pressure drilling system

Study on the Surge-Swab Pressure considering the Effect of the Cutting Plug in Shale Drilling

Drilling fault classification based on pressure and flowrate responses via ensemble classifier in Managed pressure drilling

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