Wu L.,State Key Laboratory of Continental Dynamics |
Wu L.,Northwest University, China |
Wu L.,Petrochina |
Zhu Y.,State Key Laboratory of Continental Dynamics |
And 5 more authors.
Shiyou Kantan Yu Kaifa/Petroleum Exploration and Development
The difficulties of making joint development of coal and natural gas were examined and the technical countermeasures were given through studying the case of the Shenmu gas field of the Ordos Basin, where the mining rights of coal and natural gas overlap completely. Based on the study of the main controlling factors of the distribution of favorable areas in the Upper and Lower Paleozoic formations, technical measures for different areas were determined considering well type, well pattern, efficient drilling and production, and ground gathering technology. The results show: The mining rights overlapping area of coal and natural gas can be developed jointly. The effective reservoirs of the multi-layer tight gas reservoirs can be divided horizontally into the superposition area for multi-boundaries sand body, multi-layers sand body and isolation sand body in the Upper Paleozoic formations, and the superposition area for effective reservoirs in the Upper and Lower Paleozoic formations. A cluster well group which includes nine wells is the optimal well pattern. Different reservoir area should be developed by different well type and patterns. The construction and development period of gas reservoirs will be shortened by the application of cluster well group, optimized technologies of drilling and production, and ground supporting facilities. Practice shows that the three dimensional development of the multi-layer tight gas reservoirs is also realized in the Upper and Lower Paleozoic when the joint development of coal and natural gas is done in the mining rights overlapping areas. © 2015, Science Press. All right reserved. Source
Li J.,National Engineering Laboratory of Exploration and Development of Low Permeability Oil and Gas Fields |
Li J.,Petrochina |
Bai J.,National Engineering Laboratory of Exploration and Development of Low Permeability Oil and Gas Fields |
Bai J.,Petrochina |
And 7 more authors.
Natural Gas Industry
To further improve the yield of a single horizontal well in the Sulige Gas Field, Ordos Basin, a volume fracturing test and relevant studies were carried out of Sulige tight sandstone reservoirs, including natural micro-fractures, rock brittleness, rock tensile strength, three-dimensional stress and reservoir sensitivity. In combination with the properties of such reservoirs, principles of the horizontal well selection in this field were determined first. The following technologies were formulated based on fracturing measures: i) to make research and development of large drift diameter fracturing pipe columns to meet the need of injection in large displacement; ii) to use the fluid system with low viscosity and low damage to create a complicated fracture network; iii) to combine grain-sized ceramsite to support main fractures; and iv) to further increase the simulated volume through segmental multi-seam fracturing technology. Meanwhile, it is recommended to use slick water and cross-linking fluid in combination as fracturing fluid and to mainly use 40-70 mesh and 20-40 mesh combined grain-sized ceramsite as proppant. Field tests in 10 wells were carried out in 2012, the average open flow capacity of which reached up to 680, 700 m3/d. Field practices show that this is a new technical means to improve the single-well production of horizontal wells in the Sulige Gas Field. Source