Application of High Resolution Micro-CT-Imaging and Pore Network Modeling (PNM) for the Petrophysical Characterization of Tight Gas Reservoirs- A Case History from a Deep Clastic Tight Gas Reservoir in Oman

Study and Apply of Seepage Law on Multi-Stage Fractured Horizontal Wells in Tight Gas Reservoirs

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1030-1032.1394 ◽

2014 ◽

Vol 1030-1032 ◽

pp. 1394-1398

Author(s):

Ping Wang ◽

Zhao Hui Xia ◽

Wei Ding ◽

Chao Bin Zhao ◽

Yun Peng Hu ◽

...

Keyword(s):

Scientific Evidence ◽

Horizontal Wells ◽

Tight Gas ◽

Gas Reservoirs ◽

Gas Reservoir ◽

Tight Gas Reservoirs ◽

Multi Stage ◽

Tight Gas Reservoir ◽

Commercial Value ◽

Fractured Horizontal Wells

Because the extremely low permeability for tight gas reservoirs, lead to the way to seepage and the shape of production curves different with the convention reservoirs; this will increase the difficulty to develop the tight gas reservoirs; on the other hand, the convention exploit cannot recover the tight gas with commercial value, with this problem, the main solution is the technology of multi-stage fractured horizontal wells, the fractured can provide the channel for gas to transport, the horizontal wells can increase the seepage area of tight gas, it’s the guarantee to get the commercial value. But, at present, the study on the tight was dependent on the method of convention gas reservoirs, the production curve get from this method also the same with the convention gas reservoirs, in order to close with the really exploitation of tight gas reservoirs and provide the more accurate scientific evidence, we must study based on the feature of tight gas reservoir, in this situation, we can get the suitable production curves for tight gas reservoirs. This paper based on the feature of tight gas reservoir, combine with the model of multi-stage fractured horizontal wells, and get the production equation of tight gas, combine with the yield of discard time, we can get the type curve, and then get the C level reserves of region.

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A Three-Fold Classification of Tight Gas Based Primarily on Dynamic Relationship Between Gas Charging History and Reservoir Tightening Process and its Application

The Open Petroleum Engineering Journal ◽

10.2174/1874834101508010051 ◽

2015 ◽

Vol 8 (1) ◽

pp. 51-57

Author(s):

Lei Zhang ◽

Lunwei Zhu ◽

Jianian Shen ◽

Qifei Huang

Keyword(s):

Source Rock ◽

Tight Gas ◽

Gas Generation ◽

Gas Reservoirs ◽

Gas Reservoir ◽

Tight Gas Reservoirs ◽

Gas Accumulation ◽

Dynamic Relationship ◽

Tight Gas Reservoir

Building upon the foundation of the prior investigations, a three-fold classification of tight gas reservoirs is proposed in this paper which is based primarily on dynamic relationship between gas charging history and reservoir tightening process, coupled with tectonic evolution, source-reservoir relationship, migration and charging pattern. The three categories of tight gas are: (1) “pre-existing” basin-centered gas reservoir, in which the reservoir sands experienced earlystage tightening processes, occurring before peak gas generation, expulsion from source rock, and charging of reservoir; (2) “pre-existing subsequent-improved” tight gas reservoir, in which the reservoir sands were also tightened before gas charging and then underwent reservoirs improvement mainly caused by the tectonic activities; and (3) “subsequentconventional” tight gas reservoir where reserved sands were tightened after the peak of gas generation, expulsion from source rock, and charging of reservoir. This type of tight gas initially formed conventional gas accumulation during gas charging of reservoir, and subsequently modified to tight gas reservoir. All the three categories of tight gas have different geological conditions of gas accumulation and gas accumulation patterns, which can be used as characteristics to classify these tight gas systems, and thus have distinctive control on regional gas distribution. The results of applying this tight gas classification for an actual basin show that correctly distinguishing these three kinds of tight gas reservoirs from each other could contribute greatly to the exploration and development of tight gas reservoirs.

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The Adaptability Study for Developing Tight Gas Reservoirs Using Horizontal Wells

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.423-426.614 ◽

2013 ◽

Vol 423-426 ◽

pp. 614-617 ◽

Cited By ~ 1

Author(s):

Shu Qing Peng ◽

Wan Chun Zhao

Keyword(s):

Optimization Model ◽

Horizontal Wells ◽

Tight Gas ◽

Gas Reservoirs ◽

Gas Reservoir ◽

Tight Gas Reservoirs ◽

Tight Gas Reservoir ◽

Development Effectiveness

In order to improve the development effectiveness of tight gas reservoirs, in this paper, the adaptability study of well type for developing tight gas reservoirs using horizontal wells was conducted in view of the characters of tight gas reservoir, and the well type optimization model for different reservoirs was proposed. The development effectiveness of the different well type for different reservoirs was put forward, and the adaptability of different well type for different reservoirs was obtained. The basic foundation and method of well type optimization for tight gas reservoirs was obtained.

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The Feasibility Appraisal for CO2 Enhanced Gas Recovery of Tight Gas Reservoir: Case Analysis and Economic Evaluation

10.2523/iptc-21291-ms ◽

2021 ◽

Author(s):

Ying Jia ◽

Yunqing Shi ◽

Jin Yan

Keyword(s):

Natural Gas ◽

Greenhouse Gas Emission ◽

Co2 Storage ◽

Tight Gas ◽

Gas Reservoirs ◽

Gas Reservoir ◽

Enhanced Gas Recovery ◽

Tight Gas Reservoirs ◽

Gas Recovery ◽

Tight Gas Reservoir

Abstract Tight gas reservoirs are widely distributed in China, which occupies one-third of the total resources of natural gas. The typical development method is under primary depletion. However, the recovery of tight gas is only around 20%. It is necessary to explore a new technique to improve tight gas recovery. Injecting CO2 into tight gas reservoirs is a novel trial to enhance gas recovery. The objective of this work is to verify and evaluate the effect supercritical CO2 on enhancing gas recovery and analyze the feasibility of CO2 enhance gas recovery of tight gas reservoir. Taken DND tight sandstone gas reservoir in North China as an example, 34 wells of DK13 wellblock were chosen as CO2 Enhanced gas recovery pilot area with 10-year production history. Six injection scenarios were studied. Numerical simulation indicated that the recovery of the gas reservoir of DK13 well area was improved by 8-9.5 percent when CO2 content of producers reaches 10 percent. The annual CO2 Storage would be 62 million cubic meters (110 thousand tons) and the total CO2 storage would be around 800million cubic meters (1.5 million tons). After the environmental parameter evaluation of injectors and producers, the anticorrosion schemes were put forward and the feasibility evaluation and schemes of facilities were presented. The analysis results indicated that DK13 wellblock was suitable for CO2 enhanced gas recovery no matter geologic condition, injection & production technology and facilities. However, under the current economic conditions, DK13 wellblock was not suitable for CO2to enhance gas recovery. However, if gas price rise or low carbon strategy implement, the pilot test could be carried out. In brief, CO2 could be an attractive option to successfully displace natural gas and decrease CO2 emissions, which is a promising technology for reducing greenhouse gas emission and increasing the ultimate gas recovery of tight gas reservoirs. This economic analysis, along with reservoir simulation and laboratory studies that suggest the technical feasibility of CSEGR, demonstrates that CSEGR can be feasible and that a field pilot study of the process should be undertaken to test the concept further.

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