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Application of Koopman operator for model-based control of fracture propagation and proppant transport in hydraulic fracturing operation

Journal Article · · Journal of Process Control
 [1];  [2]
  1. Texas A & M University, College Station, TX (United States); OSTI
  2. Texas A & M University, College Station, TX (United States)
This work explores the application of the recently developed Koopman operator approach for model identification and feedback control of a hydraulic fracturing process. Controlling fracture propagation and proppant transport with precision is a challenge due in large part to the difficulty of constructing approximate models that accurately capture the characteristic moving boundary and highly-coupled dynamics exhibited by the process. Koopman operator theory is particularly attractive here as it offers a way to explicitly construct linear representations for even highly nonlinear dynamics. The method is data-driven and relies on lifting the states to an infinite-dimensional space of functions called observables where the dynamics are governed by a linear Koopman operator. Here this work considers two problems: (a) fracture geometry control, and (b) proppant concentration control. In both cases, an approximate linear model of the corresponding dynamics is constructed and used to design a model predictive controller (MPC). The manuscript shows that in the case of highly nonlinear dynamics, as observed in the proppant concentration, use of canonical functions in the observable basis fails. In such cases, a priori system knowledge can be leveraged to choose the required basis. The numerical experiments demonstrate that the Koopman linear model shows excellent agreement with the real system and successfully achieves the desired target values maximizing the oil and gas productivity. Additionally, due to its linear structure, the Koopman models allow convex MPC formulations that avoid any issues associated with nonlinear optimization.
Research Organization:
Texas A & M University, College Station, TX (United States)
Sponsoring Organization:
National Science Foundation (NSF); Texas A&M Energy Institute; USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0007888
OSTI ID:
1799395
Alternate ID(s):
OSTI ID: 1630472
Journal Information:
Journal of Process Control, Journal Name: Journal of Process Control Journal Issue: C Vol. 91; ISSN 0959-1524
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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