摘要:
An improved paper clip consisting of a wire clip integrally wrapped within a folded semi rigid banding allowing for the display of printed advertising, promotional, marketing, messaging or decorative indicia, in a multitude of shape and size, as suits the material displayed, while being easier to apply, and remove, while providing protection to the papers to which it is attached from crushing and tearing.
摘要:
A method of assaying the compressive strength of rock comprises testing a primary plurality of rock samples of similar lithology, at least some of which have different porosities, to determine, for each sample respectively, a value corresponding to compressive strength and a value corresponding to porosity. A first series of pairs of electrical compressive strength and porosity signals, the signals of each pair corresponding, respectively, to the compressive strength and porosity values for a respective one of the samples, is generated. These signals are processed by a computer to extrapolate additional such pairs of signals and generate a second series of electrical signals corresponding to compressive strength as a function of porosity. The second series of signals may correspond to unconfined compressive strength, and may be further processed, to generate a cumulative series of signals, using electrical adjustment signals corresponding to other conditions affecting the compressive strength of the rock. Site characteristics of the rock for a wellbore locus, at a plurality of sites along the length of the locus, and as the rock would be addressed by a drill bit, are determined. At least one of these site characteristics is porosity. The site characteristics are used to generate a plurality of site signals, which, upon processing with the second series of signals (or cumulative series, if any), generate in-situ compressive strength signals corresponding to the in-situ compressive strengths of the rock at the respective sites.
摘要:
A method and apparatus for predicting the performance of a drilling system for the drilling of a well bore in a given formation includes generating a geology characteristic of the formation per unit depth according to a prescribed geology model, obtaining specifications of proposed drilling equipment for use in the drilling of the well bore, and predicting a drilling mechanics in response to the specifications as a function of the geology characteristic per unit depth according to a prescribed drilling mechanics model. The geology characteristic includes at least rock strength. The specifications includes at least a bit specification of a recommended drill bit. Lastly, the predicted drilling mechanics include at least one of bit wear, mechanical efficiency, power, and operating parameters. A display is provided for generating a display of the geology characteristic and predicted drilling mechanics per unit depth, including either a display monitor or a printer.
摘要:
A well logging instrument, embodied both in drillstring and in wireline logging systems, is caused to traverse an earth borehole and to generate lithology-related data. First and second lithology compositional models are constructed from such data and are combined to determine a range of possible solutions having an upper limit defined by a pure component model and a lower limit defined by a proportional mixture model, thus allowing the maximum concentration of any lithologic component to vary between 0% and 100%. The exact value of the lithology lies between the upper and lower limits in the range of values and can be calibrated to a mineralogic analysis of actual core samples or drill cuttings.
摘要:
A method of regulating drilling conditions applied to a given well bit comprises assaying the compressive strength of the formation in an interval to be drilled by said bit. Wear of critical bit structure of the same size and design as in said given bit and which structure has drilled material of approximately the same compressive strength as that so assayed, is analyzed along with respective drilling data for the worn structure. From said analysis, a power limit for the respective compressive strength, above which power limit excessive wear is likely to occur is determined. Drilling conditions, such as rotary speed and weight-on-bit, at which the given bit is operated are regulated to maintain a desired operating power less than or equal to the power limit. Where several feasible rotary speed/weight-on-bit combinations may result in the desired operating power, these conditions are optimized.