New breakthroughs in tight oil exploration in Qinghai Oilfield

The exploration of tight oil (shale oil) in Zhaha Springs, Qinghai Oilfield, PetroChina has achieved new breakthroughs recently. As of now, Zha 9 well of Qinghai Oilfield Company has cumulatively produced 125 cubic meters of crude oil. At the end of February this year, the National 973 Program “The Formation Mechanism and Enrichment Regularity of China's Terrestrial Tight Oil (Shale Oil)” was formally launched. The tight oil exploration in Zhaha Springs of Qinghai Oilfield was used as a key test area, and it was implemented in 2013 by Qinghai Oilfield. The first one hundred million tons of tight oil reserves.

Zha 9 well is located in the Zhahaquan area in the depression area of ​​western Qaidam Basin and is a key prospecting well deployed in the Qinghai oil field. According to Zou Cai, chief scientist of the China National Territory 973 Program on Formation Mechanism and Enrichment of Terrestrial Tight Oil (Shale Oil) and Associate Dean of the China Petroleum Exploration Institute, the United States is a promoter of marine shale gas. Our country is likely to be the leader of the continental shale oil **. The “China Terrestrial Tight Oil (Shale Oil) Formation Mechanism and Enrichment Law” project will rely on the China Petroleum Exploration and Development Research Institute to carry out basic research in the five major basins of Ordos and Junggar to solve China’s terrestrial tight oil (shale oil). Based on the three major exploration and production needs of resource potential assessment, favorable area prediction and reserve size, the preliminary geological prospecting theory and evaluation methods for China's terrestrial tight oil (shale oil) are developed to promote the rapid development of tight oil, shale oil exploration breakthrough and improvement. The regulatory and scientific and technological innovation capability is of great significance.

Well Zha-9 drilled to a depth of 3,650 meters in October 2013. During the drilling, the oil and gas show was active. The total wells were found to have a gas detection anomaly of 95 meters/27 layers. In N1, explain the 56.4m/19th oil layer and the suspicious oil layer 23.4m/6 layers. On February 28th, this oil field preferred perforation of the N1 formation I sand layer, which was produced by spraying with a 4 mm oil nozzle. The daily production of crude oil was 26.13 cubic meters, which enabled the tight oil exploration area of ​​Zhaha Spring to achieve the N1 reservoir toward the southeast in the plane. Expansion, increase the oil-bearing section in the longitudinal direction.