Article Archive
Article Archive
- Introduction of Cement Slurry System (Part 1)
- Introduction of Cement Slurry System (Part 2)
- Introduction of Cement Slurry System (Part 3)
- Introduction of Cement Slurry System (Part 4)
- High Temperature and High Pressure Cementing Technology
- Low Density Cementing Slurry Technology
- Anti Gas Channeling Cementing Technology
- Drag Reducing Agents (DRA) or Drag Reducers (DR)
- Nitrogen Surfactant Compound Huff and Puff Technology
- Oil Washing Technology for Increasing Production
3. Difficulties and problems in cementing operation of the company
3.1. The operation object is complicated, and the material requirements are greatly improved
At present, PetroChina's oil and gas exploration and development are faced with "deep (deep), low (low pressure, low permeability, low abundance), sea (Ocean), unconventional (shale gas, tight oil, tight gas, etc.)" oil and gas resources, and a series of problems, such as poor quality of resources, complex objectives, strict safety and environmental protection, are unavoidable.
Coal bed gas well cementing is low temperature, easy to leak out and easy to hurt; large volume fracturing of tight oil gas and shale gas well is very demanding for cementing quality, cement ring sealing and long-term sealing, which puts forward higher requirements for cement slurry system and cementing material performance.
3.2. The problem of annulus pressure is prominent, and the integrity of wellbore seal is increasingly valued
With the increase of the number of natural gas wells drilled, the extension of production time, the acceleration of the construction of gas storage, and the continuous increase of shale gas and tight gas development, the economic and efficient development mode of "horizontal well + volume fracturing" has been promoted, but some wells have problems of annular air channeling or annular pressure, which affects the safety of production. At present, the integrity of wellbore seal and the quality of long-term cementing are paid more and more attention.
3.3. It is difficult to control the activity cost
PetroChina adheres to the development policy of "quality, efficiency and sustainability", strictly controls the investment return standard, and reduces the total investment. Therefore, the cementing industry is naturally affected. The oil companies should strictly control the operation cost, the cementing materials should be of good quality and low cost, and the cementing quality should be strictly guaranteed without increasing the cost, so the difficulty it faces can be imagined.
(1).jpg)