National Energy Shale Gas R and perimental Center

Langfang, China

National Energy Shale Gas R and perimental Center

Langfang, China
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Sun H.,Drilling and Production Technology Research Institute | Sun H.,National Energy Shale Gas R and perimental Center | Wang C.,Drilling and Production Technology Research Institute | Wang C.,National Energy Shale Gas R and perimental Center | And 4 more authors.
Natural Gas Industry | Year: 2017

According to China's shale gas development plan (2016-2020), national shale gas production will exceed 300×108 m3 in 2020. However, China's shale gas resources are mainly distributed in the central and western mountain areas which are characterized by complex surface landforms, intensive population and extremely sensitive development environments. Therefore, the uppermost priority of scale shale gas development is to build a more harmonious development environment and pave an environmentally friendly shale gas development road. In this paper, a technology system of cleaner production with "energy conservation, consumption reduction, pollution abatement and efficiency improvement" as the goal and "minimization, harmlessness and resources" as the focus was summarized based on the practical cleaner production in Changning-Weiyuan national shale gas demonstration area in the Sichuan Basin. When well site is designed and drilling and completion technologies and materials are selected, the production demands and environmental requirements should be considered comprehensively to give the priority to the environmentally friendly technologies and materials and control the total drainage of waste liquid and solid in the process of well drilling and completion from the source. The process control of waste gas, water and solid during well drilling and completion is strengthened to cut down further the total volume of waste. Based on the drilling operation and environmental protection practices for years, the waste central treatment and reuse technology system is developed to improve end treatment level. Field application shows that by performing source prevention, process control and end treatment, the bad effect of shale gas drilling operation on the ecology of surrounding environment is reduced significantly and good environmental and social benefits are realized. © 2017, Natural Gas Industry Journal Agency. All rights reserved.


Zhang Q.,Petrochina | Zhang Q.,National Energy Shale Gas R and perimental Center | Zhang Q.,China National Petroleum Corporation | Liu H.,Petrochina | And 8 more authors.
Natural Gas Industry | Year: 2013

The determination of shale gas content is of great significance to the assessment of shale gas reserves and the identification of play fairway. Under the guidance of geologic theory, we performed a correlative analysis of factors that may influence shale gas content. In the Lower Silurian Longmaxi Fm shales in southeastern Chongqing, shale gas content may be influenced by various factors such as porosity, permeability, water saturation, TOC, Ro, clay content, quartz content, carbonate content and pyrite content. The effects of these potential factors are evaluated through normalized factors analysis, providing the criteria for eliminating the factors with minor effects on gas content from the initial set. Fast iterative clustering with Euclid distance and correlation was adopted to obtain the major controlling factors including TOC, porosity, quartz content and pyrite content. On this basis, a stepwise regression method was used to formulate the fitting equation for the correlation between gas content and these determined major controlling factors, which was also validated and found to be in consistent with the data from other well cores and outcrop samples. With this proposed correlation method, the shale gas in place in this study area is calculated to be 1.77 trillion m3, indicating that the study area is prosperous for future shale gas exploration and development.


Zhao Q.,China University of Geosciences | Zhao Q.,Petrochina | Zhao Q.,National Energy Shale Gas R and perimental Center | Wang H.,Petrochina | And 7 more authors.
Natural Gas Industry | Year: 2013

The shale gas volume lost during the shale core desorption test is calculated by the analytical method that is regularly used in the coal-bed methane desorption test at present. However, the analysis of the measured desorption test data of shale cores reveals that the time of shale coring is usually long and the heterogeneity of porosity and permeability is strong due to the existence of natural fractures in cores (multiple straight lines in the desorption curves).These characteristics make this analytical method unsuitable to calculate the lost shale gas volume. Therefore, as the shale core canister desorption test process is similar to some extent to gas well recovery process with constant pressure under closed outer boundary, the Arps decline method was then proposed to calculate the lost shale gas volume in the desorption test. Three Arps decline patterns were used to match shale core desorption curves and the exponential decline method was found to be the best in matching with the measured data in the whole test interval. As a result, 20%-40% of the lost shale gas volume, underestimated by the previous analytical method, was calculated by the Arps exponential decline method. In conclusion, this new method, with few parameters needed and restrict prerequisite unnecessary, can reflect the influences of various factors on the shale core desorption, and is more suitable for calculating the lost gas volume during the shale core desorption test.

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