China has begun shale gas exploration and mining technology

The latest National Science and Technology Major 2012 Annual Report released by the Ministry of Science and Technology of China revealed that in the major projects of “large oil and gas fields and coalbed methane development”, shale gas resource evaluation technology and exploration technology have been initially formed in the field of shale gas exploration and development in China. And mining technology confirmed the prospect of China's shale gas resources and built two national-level shale gas development demonstration zones.

The major project has established a shale gas resource evaluation process and method. It is estimated that the resources of China's marine shale gas prospects are 32.22 trillion square meters, and the recoverable resources are 11.46 trillion square meters. 11 marine pages are preferred in southern China. The target area of ​​rock gas is also newly built as a national energy shale gas research and development (experiment) center at the national level.

At the same time, two national-level shale gas development demonstration zones were built in Changning-Weiyuan, Sichuan and Zhaotong, Yunnan. The shale gas vertical well fracturing technology and horizontal well sectional fracturing technology have been formed in the demonstration area, and the test was successful. At present, there are 27 wells drilled in the Changning-Weiyuan national shale gas demonstration area, and 19 drills are completed. The daily output of vertical wells is 0.2-3.3 million square meters, and the daily output of horizontal wells is 10,000-160,000 square meters.

Shale gas is natural gas extracted from shale formations and is an important unconventional natural gas resource. Shale gas is often distributed in shale source rock formations with large thickness and wide distribution in the basin. Compared with conventional natural gas, shale gas development has the advantages of long mining life and long production cycle. Most gas-producing shale has a wide distribution range, large thickness, and generally contains gas, which enables shale gas wells to be produced at a stable rate for a long time. gas.

The successful development of shale gas in the United States has been hailed as an energy revolution in the first decade of this century. The world's resource countries have begun to explore the development of shale gas. China has also clearly stated in the 12th Five-Year Plan. “Promoting the development and utilization of unconventional oil and gas resources such as shale gas”.

On February 27th, the national “973” project “Basic Research on the Efficient Development of Marine Shale Gas in Southern China” was launched in Beijing. This major project led by PetroChina will fill the gap in domestic research on the theoretical system of shale gas efficient development and provide theoretical guidance for the efficient development of shale gas.

China has abundant shale gas resources and has good development prospects. Efficient development of shale gas is of great significance for realizing China's energy security supply and meeting the national demand for natural gas. The Chinese Academy of Engineering predicted in 2011 that China's shale gas resources are mainly concentrated in the southern Paleozoic, and the technically recoverable resources account for 3/4 of the country's total. It has obtained preliminary discoveries in Sichuan, Chongqing, Yunnan, Guizhou and Hunan.

Compared with North America, which has achieved great success in shale gas development, the southern marine shale reservoir has the characteristics of strong structural transformation, complex geostress, deep burial and special surface conditions. It is difficult to develop effectively by foreign theory and technology. Research and development theory and methods.

Not long ago, the Ministry of Science and Technology issued the "Notice on the Issuance of the National Key Basic Research Development Plan and the Major Scientific Research Plan 2013 Project Application Guide", which requires the study of multi-scale unconventional reservoir quantification around the major demand for efficient development of shale gas in China. Description and characterization, non-conventional reservoir nonlinearity, multi-field coupled seepage theory and other series of studies, forming the geological and engineering theoretical basis for the efficient development of natural gas in unconventional reservoirs such as shale gas in China. Since then, the “Basic Research on the Effective Development of Marine Shale Gas in South China” has been officially established.

China Petroleum Exploration and Development Research Institute, together with China Petroleum Drilling Research Institute, China University of Petroleum (Beijing), Xi'an Jiaotong University and PetroChina Southwest Oil and Gas Field, and other units, strive to provide theoretical methods and technical support for the development of shale gas industrialization in China.

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