Abstract This paper establishes the risk assessment index system according to characteristics of oil and gas drilling engineering cooperation project. After modularizing risk indexes of oil and gas drilling engineering cooperation project into eight clusters, risks are evaluated on the basis of multi-level fuzzy comprehensive evaluation method. The study is to construct risk assessment indexes ...

In China’s unconventional oil drilling, horizontal wells are one of the main forms water-in-oil drilling fluid have been widely used due to their stable performance and excellent lubricating properties. To reduce high cost fluids at site, further pressure cuttings processing, meet requirements environmental protection, an oil-based system with a low oil-water ratio was developed. Based on resea...

Fluid Flow during the circulation of drilling fluid is an important parameter that affects process successful lifting cuttings activities. Researcher analyzed regimes flow in vertical wells through analysis velocity calculation pipeline at conditions Drillpipe (v DP) 21.11791 fps and drill collar DC) 42.98293 fps, annulus between Casing Drill pipe 1.14993 1.373781 Open Hole pipe, 1.594947 Colla...

The continuous development of global economy with decreasing in available hydrocarbon sources and increasing discovery and extraction costs due to decrease in-situ oil and gas reservoir, displays the necessity of using new techniques for the improve rate of penetration and productivity in well. Nanotechnology has already contributed significantly to technological advances in the energy industri...

The operation experience of horizontal segment well in the southern Sichuan area within hard brittle shale layer Longmaxi formation demonstrates that high-density oil-based drilling fluid (HDOF) induced down-hole working condition, which is typically high-temperature, high-pressure and solid-phase-dominant, will directly impact stability wellbore wall. Focusing on bottom-hole osmotic pressure s...

Drilling engineering comprises a major part of production and exploration in oil fields and drilling risk is a significant ingredient to success. As one of the crucial ways to terminate oil spill event, relief well assumes great responsibility. Thus it is essential to analyze and assess the risk of relief well technique before drilling operation in order to guarantee rescue project work smoothl...

For the past three decades the quantity of petroleum (both oil and oil plus gas) found per foot of drilling effort in the United States for any given year can be expressed as a secular decrease of about 2 percent per year combined with an inverse function of drilling effort for that year. Extrapolation of energy costs and gains from petroleum drilling and extraction indicates that drilling for ...