The longest coring section in a single well is 361.8 meters. my country's first shale oil hydraulic fracturing test site was officially built.

This site reported on June 20 that Qingcheng Oilfield, my country’s two-million-ton shale oil development demonstration base, has completed the on-site coring work of two inspection wells, the collection of basic core data and various supporting test data. , which marks the official completion of my country’s first shale oil hydraulic fracturing test site. The completion of the test site will help improve the extraction efficiency of my country’s shale oil resources.

Inquiries on this website learned that shale oil refers to oil that exists in shale formations. Because it is stored in very fine particles, it has poor fluidity and needs to be extracted through thermal or chemical methods. Usually exploited using "horizontal well" and "staged fracturing" technologies:

The horizontal drilling method collects shale oil by drilling horizontal wells underground, forming a certain angle between the wellbore and the shale layer;

• Hydraulic fracturing is a method of extracting shale oil by injecting a large amount of water, chemicals, sand and other mixtures underground to "fracturing" rock formations at high pressure.

• According to reports, the Ordos Basin where the Changqing Oilfield is located is rich in shale oil resources. Among them, the proven geological reserves of the Qingcheng Oilfield exceed 1 billion tons of shale oil, which is the shale with the largest proven reserves in my country. Big oil field. Due to the characteristics of thin layers, strong heterogeneity and dense reservoirs in this area, development is extremely difficult.

In order to improve the single-well production and economic benefits of horizontal wells, PetroChina has deployed the country's first hydraulic fracturing test site construction project in Changqing Oilfield in 2021. After three and a half years of construction, the Changqing Oilfield shale oil development research team conducted on-site drilling, fracturing, coring, and 10 supporting tests 15 times. The longest coring section in a single well is 361.8 meters, breaking through the Changqing shale oil horizontal well The longest coring record for a single well.

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