Liu Yumin's Main Achievements

1. drilling tools and technology research: responsible for the project of "casing drilling technology research in Daqing Oilfield" of China Petroleum and Natural Gas Group Company. It mainly solves the problems of string connection mode, casing torsion and connection performance, drilling performance of ground bit, post-drilling logging of oil layer and so on under the condition of no top drive. This project focuses on researching and matching 4 technologies, 2 casing threads, 8 tools, 5 drilling shoes, 2 equipment and 2 instruments. The theoretical calculation of three kinds of casing and tools is emphatically introduced. We have obtained 10 national patents, and 1 invention patents are being accepted. We have successfully conducted field drilling tests on the surfaces of 5 wells and 2 oil-bearing casings, thus shortening the drilling cycle. Successfully completed all the research contents required by the project contract, passed the project acceptance of oil and gas group company, and reached the leading technical level in China.

2. Research on cementing tools and technologies: (1) Further innovative research has been made on the balanced differential pressure external casing packer: a. The differential pressure between inside and outside changed from grading to stepless, which improved the accuracy of opening pressure. B. The bursting pressure of rubber tube was increased from 18MPa to 30MPa, and the length of rubber tube was increased from 0.6m to 1.3 ~ 9 m, which enhanced the annular sealing performance of rubber tube. C. Improve the operability of the test system, and increase the number of test items from 2 to 8, thus improving the reliability. (2) Studied the multi-card technology: safely realized the multi-card technology of setting 6 ~ 7 knives without grading or grading the operating pressure. (3) To be responsible for the research of double-card cementing technology of self-pressurized casing external packer, which effectively improves the annular pressure stability. (4) Responsible for the development of casing cementing device, which can effectively prevent the displacement of cement slurry and drilling fluid and the sinking of cement cap.

3. As the first inventor, he obtained the patent project 13. (1) Balanced differential pressure casing external packer (2) Hydraulic rotary percussion drilling tool (3) Hydraulic rotary percussion drill bit (4) Casing external cementing device (5) Casing drilling adapter (6) Casing drilling casing fixer (7) Casing drilling centralizer (8) Special cementing rubber plug for casing drilling (9) Casing drilling rubber plug (1)

4. Popularize the patented technology-balanced differential pressure external packer: use more than 1 100, which can effectively prevent pipe detachment and interlayer channeling after cementing and realize clean water cementing replacement operation. Self-pressurizing casing packer and double-card cementing technology are adopted. In 2004, this technology was applied in Xing 12 area 104 well of No.5 Oil Production Plant, and the qualified rate of cementing quality increased from 36% to 72.4%.

5. Popularize the patented technology-casing cementing device, which has been applied in 1200 wells, effectively preventing cement slurry from replacing drilling fluid and preventing cement slurry from sinking, and achieved good results.

6. Published papers: 16 (including 13 national second-class publications). 1 First Prize Paper of Petroleum Engineering Society of China Petroleum Institute.

7. Compilation of bureau-level standards: 2 articles.

8. Daqing Science and Technology Progress Award: 3 first prizes, 5 second prizes and 4 third prizes for scientific and technological progress of Daqing Petroleum Administration Bureau.