No abstract

Oceans have been proved to be an important resource due to their abundant reserves in oil and gas. However, because of the extent of oil exploration and development in recent years, the marine ecological environment has been increasingly affected. At present, the control and treatment of environmental pollution from offshore drilling both at home and abroad have focused on end-treatment after problems have already emerged. Nevertheless, preventative measures and appropriate control links has not been addressed. The main content of this study is to establish evaluation indexes of a "green" ocean drilling fluid system that will be environmentally friendly and applied to oilfields, such as the Bohai bay in the Shenli oil field. The results show that the recommended "green" ocean drilling fluid system has a good drilling performance, meets the requirements of drilling engineering and marine environmental protection, and achieves the source control of environmental contamination from offshore drilling. The environmental performance of this fluid is superior to sulphonated polymer mud drilling fluid and oil-based drilling fluids.

Waste oil-based drilling fluids are hazardous wastes containing oil, heavy-metal and organic pollutants. However, the common treatment methods at home and abroad these methods not only waste many useful resources (because the oil is discarded rather than recovered) but also increase the pro-environment cost of oil companies. This paper develops useful recycling and safe disposal technology of waste oil-based drilling fluids from the perspective of utility, efficiency and economy, which not only recycle useful oil but also reuse and dispose of the rest of mud and waste drilling fluids. The rate of recovery is greater than 90%, and the quality of the recycled oil is very good and meets the requirement of -10 # diesel of cars in GB/T 19147-2003. The concentrations of oil, COD (chemical oxygen demand) and heavy metals in liquid of the processed mud are lower than the secondary standard number in GB8978-1996. The treated wastewater meets the requirements of sewage comprehensive emission.

A simple model of gross solids' movement in sewers is proposed, based upon the results of studies of part-full pipe flow in two laboratory installations, under steady and unsteady flow conditions. The model covers advection and deposition, and is intended as one component in a comprehensive model of the behaviour of gross solids in sewers. Such a model is needed because gross solids are not included in the currently available sewer-flow quality models, even though they can cause pollution which is of particular concern to the public.The paper describes the laboratory studies and their results. It sets out the principles of the proposed model and explains why these differ from existing models of dissolved and fine suspended pollutants.

Considering the product oil has volume compressibility and volume expansion in different temperature and pressure, calculate the LAN-Zheng- Chang product pipeline in the shutdown during the initial station and 1#valve pressure drop rate, combined with the first station in Lanzhou reservoir area of the oil temperature oil temperature drop analysis is the first station in the main reason of pressure pipeline shutdown early fall, and provides technical support for the other new product oil pipeline.