SeTES: A self-teaching expert system for the analysis, design, and prediction of gas production from unconventional gas resources

Moridis, George J.; Reagan, Matthew T.; Kuzma, Heidi Anderson; Blasingame, Thomas Alwin; Huang, Yi-Che; Santos, Ralph; Boyle, Katie L.; Freeman, C. M.; Ilk, Dilhan; Cossio, Manuel; Bhattacharya, Srimoyee; Nikolaou, Michael

doi:10.1016/j.cageo.2013.04.001

Cited by 3 publications

(9 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The discussion and analysis in this section hews very closely to an earlier study (Moridis et al, 2013). Although the basic geological model and the production strategy remain the same as in the earlier study, new data, the consideration of heterogeneity, and the use of a 3D domain results in a drastically different reservoir simulation, with different grid geometry and different porous media properties.…”

Section: System Description and Production Strategymentioning

confidence: 77%

“…This study focuses on the oceanic hydrate deposits located in the Ulleung basin, continuing the previous studies of Moridis et al (2013).…”

Section: System Description and Geometrymentioning

confidence: 83%

“…The depth of the seafloor is between 1,500m and 2,300m, and the depth at the site in question, the UBGH2-6 site, is 2,157m. The reservoir can be described as a hybrid of a Class 2 reservoir and Class 3 reservoir (Moridis et al, 2007a;2007b;2013). The Class 2 behavior is owed to the section with an overlying mobile water zone, and the Class 3 behavior to the layers confined between lowpermeability zones.…”

Section: System Description and Geometrymentioning

confidence: 99%

“…This study is a continuation and expansion of earlier studies by Lawrence Berkeley National Laboratory (LBNL) and the Korea Institute of Geoscience and Mineral Resources (KIGAM) in support of a planned short-term field test (Moridis et al, 2009;2013). We use the most recent flow and geomechanical properties of the sediments at the UBGH2-6 site, as gleaned from core analyses and advanced geophysical surveys.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

System response to gas production from a heterogeneous hydrate accumulation at the UBGH2-6 site of the Ulleung basin in the Korean East Sea

Moridis

Reagan

Queiruga

et al. 2019

Journal of Petroleum Science and Engineering

Self Cite

View full text Add to dashboard Cite

We investigate the feasibility of production from a layered marine gas hydrate reservoir using the properties and conditions corresponding to the UBGH2-6 site of the Ulleung Basin in the Korean East Sea. The work expands and furthers previous investigations in support of a proposed field test. The target system is location in deep water and consists of 13 m of alternating hydrate-bearing sand and soft mud layers and will be produced using a vertical well. We assess production potential during a 14-day field test, examine sensitivity to heterogeneity in permeability, porosity, and initial hydrate saturation, and assess the geomechanical response of the system to short-term production. Producing gas from the system appears to be technically feasible, however, low production rates and relatively large water production rates are expected during the field test. Expected subsidence and reservoir compaction is limited given the current data and the short timeframes of the production test.

show abstract

Section: System Description and Production Strategymentioning

confidence: 77%

“…This study focuses on the oceanic hydrate deposits located in the Ulleung basin, continuing the previous studies of Moridis et al (2013).…”

Section: System Description and Geometrymentioning

confidence: 83%

Section: System Description and Geometrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

System response to gas production from a heterogeneous hydrate accumulation at the UBGH2-6 site of the Ulleung basin in the Korean East Sea

Moridis

Reagan

Queiruga

et al. 2019

Journal of Petroleum Science and Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…Their technique is an operational use of model-based optimization which requires a combination of long-term and shortterm objectives through multi-level optimization strategies. Moridis et al (2013) established a self-teaching expert system to increase oil production by improving flooding efficiency and reducing geological uncertainty.…”

Section: Closed-loop Reservoir Managementmentioning

confidence: 99%

A review of closed-loop reservoir management

Hou

Zhou

Zhang³

et al. 2015

Pet. Sci.

View full text Add to dashboard Cite

The closed-loop reservoir management technique enables a dynamic and real-time optimal production schedule under the existing reservoir conditions to be achieved by adjusting the injection and production strategies. This is one of the most effective ways to exploit limited oil reserves more economically and efficiently. There are two steps in closed-loop reservoir management: automatic history matching and reservoir production optimization. Both of the steps are large-scale complicated optimization problems. This paper gives a general review of the two basic techniques in closed-loop reservoir management; summarizes the applications of gradient-based algorithms, gradient-free algorithms, and artificial intelligence algorithms; analyzes the characteristics and application conditions of these optimization methods; and finally discusses the emphases and directions of future research on both automatic history matching and reservoir production optimization.

show abstract

Effect of Pressure-Propagation Behavior on Production Performance: Implication for Advancing Low-Permeability Coalbed-Methane Recovery

Sun

Shi

et al. 2018

SPE Journal

View full text Add to dashboard Cite

Summary Low-permeability coalbed-methane (CBM) reservoirs possess unique pressure-propagation behavior, which can be classified further as the expansion characteristics of the drainage area and the desorption area [i.e., a formation in which the pressure is lower than the initial formation pressure and critical-desorption pressure (CDP), respectively]. Inevitably, several fluid-flow mechanisms will coexist in realistic coal seams at a certain production time, which is closely related to dynamic pressure and saturation distribution. To the best of our knowledge, a production-prediction model for CBM wells considering pressure-propagation behavior is still lacking. The objective of this work is to perform extensive investigations into the effect of pressure-propagation behavior on the gas-production performance of CBM wells. First, the pressure-squared approach is used to describe the pressure profile in the desorption area, which has been clarified as an effective-approximation method. Also, the pressure/saturation relationship that was developed in our previous research is used; therefore, saturation distribution can be obtained. Second, an efficient iteration algorithm is established to predict gas-production performance by combining a new gas-phase-productivity equation and a material-balance equation. Finally, using the proposed prediction model, we shed light on the optimization method for production strategy regarding the entire production life of CBM wells. Results show that the decrease rate of bottomhole pressure (BHP) should be slow at the water single-phase-flow stage, fast at the early gas/water two-phase-flow stage, and slow at the late gas/water two-phase-flow stage, which is referred to as the slow/fast/slow (SFS) control method. Remarkably, in the SFS control method, the decrease rate of the BHP at each period can be quantified on the basis of the proposed prediction model. To examine the applicability of the proposed SFS method, it is applied to an actual CBM well in Hancheng Field, China, and it enhances the cumulative gas production by a factor of approximately 1.65.

show abstract

SeTES: A self-teaching expert system for the analysis, design, and prediction of gas production from unconventional gas resources

Cited by 3 publications

References 19 publications

System response to gas production from a heterogeneous hydrate accumulation at the UBGH2-6 site of the Ulleung basin in the Korean East Sea

System response to gas production from a heterogeneous hydrate accumulation at the UBGH2-6 site of the Ulleung basin in the Korean East Sea

A review of closed-loop reservoir management

Effect of Pressure-Propagation Behavior on Production Performance: Implication for Advancing Low-Permeability Coalbed-Methane Recovery

Contact Info

Product

Resources

About