Good news! The output of shale oil in the Jiangsu oilfield exceeds 50,000 tons.
Jiangsu Oilfield actively promotes the non-parallel resource strategy, strengthens the exploration and development of shale oil, and achieves another breakthrough in oil and gas resources! As of July 28, the cumulative output of shale oil in the Jiangsu Oilfield exceeded 50,000 tons. At present, the oil field has shale oil wells such as Hua 2 side HF, Huaye 3 HF, and Huaye 5 HF in the Subei Basin, with a daily oil production of nearly 200 tons.
Tens of millions of years ago, the sedimentary organic matter such as algae and plants contained in mud shale was deeply buried underground under the influence of crustal movement. Under the action of high temperatures and high pressure for a long time, oil was formed and stored in tiny shale cracks.
The shale in the Subei Basin is as dense as a whetstone, and its pores are nanoscale, or one-thousandth the size of a human hair, making it one of the most difficult reservoirs to exploit. It requires complex engineering processes and technology to carry out effective development.
What is even more difficult is that, compared with shale oil in other regions of China, the shale in the northern Subei Basin has a large burial depth, rapid changes in lithofacies, and strong heterogeneity, and the burial depth is generally more than 3,500 meters. The thickness of the single layer of the same lithofacies is less than 5 meters, large and small faults are developed, and multiple faults are encountered in a single well.
In this regard, the staff put forward the idea of fault-block shale oil exploration. According to the differences between fault blocks, fault-block shale oil is divided into three types: continuous stable type, micro-fault cutting type, and cross-block multi-desert type, and precise policies are adopted according to local conditions to improve the exploitation efficiency.
In May this year, the shale oil well Huaye 7HF successfully completed 32 stages of fracturing with a vertical depth of more than 4,200 meters, an average sand intensity of more than 4.2 tons per meter, the fracturing vertical depth, the amount of sand added to a single well, the average sand intensity, and the total amount of carbon dioxide injected in Subei Basin, the highest four records. On June 9, the Huafye 7HF well used a 3mm oil nozzle to discharge the liquid and saw a high-yield industrial oil flow.
In order to ensure the stable and high production of the shale oil Wells that have been put into operation, the scientific and fine management of the shale oil Wells has been strengthened. The whole cycle working system of braising well, draining liquid to oil, peaking stable production, and declining stage is formulated to make full use of formation energy to achieve stable and high production of shale oil Wells.
