Wax in waxy crude oil is one of the main reasons for the poor fluidity of crude oil. In order to solve the great difficulties brought by the fluidity of waxy crude oil to crude oil mining and gathering, it is necessary to carry out wax removal treatment on crude oil.Microbial paraffin removal technology is the use of microbial metabolism to directly degrade wax components in crude oil and degrade long chain hydrocarbons into medium and short chains, thus reducing the wax content in crude oil at all. By detecting the wax content in crude oil and wax crystal morphology before and after the treatment of compound bacteria, the effects of the compound bacteria on the degradation of wax components in crude oil and the morphology and size of wax crystals in crude oil are studied, it is concluded that the wax removal characteristics of the compound bacteria are analyzed macroscopically. Finally, the paraffin removal effect of the compound bacteria is verified from the microscopic point by detecting the particle size distribution of the oil sample after paraffin removal treatment.

The source, the composition and the harm of iron and steel pickling waste water are introduced, and the state of art, the principle and the advantages/disadvantages on treating the iron and steel pickling waste water both domestic and abroad were analyzed. The present situation of acid recycling and metals recovery for the iron and steel pickling waste water is reviewed, and acid recycling methods including diffusion dialysis, membrane techniques, evaporation and spray roasting, and the metals recovery methods such as neutralization and precipitation, crystallization, ion exchange and so on are emphasized. These technology can achieve the acid recycling and metals recovery in order to make good use of resources.

As the cement slurry hydration speed is slow, the curing time is long and the increase of cement early compressive strength is slow in the low temperature cementing of conductor and surface casing, it is easy to result in oil, gas and water invasion which impairs cementing quality and operation safety. In view of the fact that the accelerator is lack in cementing of low temperature shallow formation currently at home, some accelerators have poor effectiveness and significant negative impact on slurry rheology etc, a new compound accelerator WSA1 was selected by laboratory study. The performance of slurry that mixed WSA1 was systematically evaluated. The result shows that the accelerator WSA1 can enhance the hydration of oil well cement, shorten the thickening time of cement slurry and significantly improve the early compressive strength of cementstones, which all accord with the requirement of the accelerator evaluation criterion. When WSA1 addition amount is 3%, the thickening time of cement slurry can be shortened more than 50%, the 6 h strength of cementstones enhanced from 3.2 MPa to 11.3 MPa and the 24 h strength of cementstones enhanced from 24.3 MPa to 46.1 MPa. Accelerator WSA1 is a kind of highperformance compound accelerator, which can be used in low temperature shallow formation and has no effect on the initial consistency and rheological parameter of cement slurry. 