Based on principle and methods for base level cycle, the drilling, well logging, seismic and geochemical data from Hadexun area are analyzed. One I-type and three II-type sequence interfaces of Lower Carboniferous are recognized, and three medium-term base level cycles (SC_1, SC_2, SC_3) corresponding to three transgressive-regressive cycles are classified.
Based on the data of well-drilling, cores and well-logging, this paper has constituted a criterion of recognizing and dividing reservoir rocks in the studied area, and has divided and evaluated the carbonate reservoir beds of lower Ordovician in Ln1 and Ln8 wells.
Drilling new techniques of top drive,MWD,steerable drilling system etc. and some measures how to raise well-drilling speed and guarantee quality are analysed and summarized to provide successful experiences for the development and construction of offshore key enineering and the further spread and application of cluster directional drilling techniques.
Wear mechanism of disc-brake block material for new type of drilling rig
Two hundred and eighty-one samples, collected from drilling core NS93-5 located in the Nansha area of the South China Sea, were used to study the magnetic characteristics of the sediments in the sea.
Drilling results have indicated that the pore pressure is hydrostatic in shallow-water area.
Based on studies of regional tectonic setting and the observation of drilling cores, the seismite is recognized in member III at Shahejie Formation in the Xianhe area of the Dongying sag.
By observing the drilling cores of He 152, Wang 59, Niu 38, Niu 22 and so on, we found that the vertical sequences of the seismite are different because of the differences in structure and seismic intensity.
Based on analysis of the well drilling core from Subei basin, the authors conclude that during the Late Cretaceous and Paleocene, Subei basin was linked with the sea and the deposit was affected by transgression.
Optimal Choice of Coordinates for Oil Well Drilling
On the basis of seismic and well drilling data, the deposits in the area were studied by using sequence stratigraphy and reservoir prediction techniques.
Consideration is given to a mathematical model of water influx to a perfect well drilling in a homogeneous water-bearing stratum.
Vertical, depth-discrete groundwater samples were collected during well drilling throughout a 28-km2 region to determine the concentration of carbon tetrachloride present as a dissolved phase in the aquifer.
Effects of oil and gas well-drilling fluids on the biomass and community structure of microbiota that colonize sands in running
There were some shading effects from the surface layering of well-drilling fluids as reflected in the fatty acids from the microflora when compared to the sands mixed with well-drilling fluids.
Effect of well-drilling fluids on the physiological status and microbial infection of the reef building coralMontastrea annulari
The reef building coral,Montastrea annularis, was exposed continuously to suspensions of oil and gas well-drilling fluids at concentrations of 0.1, 0.01, and 0.001 μl/ml in flowing seawater at the U.S.
Improvement and specialization of piston pumps for oil and gas well-drilling and production operations