J+=j

Introduction to linear and nonlinear programming

http://hera.wdcb.ru/tols/tecton/method/biblio/magn/Zoback_03.pdf

Determination of stress orientation and magnitude in deep wells

Various systems and method related to home automation systems are presented. A service robot system may be present that includes a service robot that autonomously moves within a structure to perform a household task. The service robot system may include a wireless communication interface, wherein the service robot system is configured to transmit, via the wireless communication interface, an indication of robot activity indicative of the service robot moving within the structure. Such a home automation system may also include a home security system that includes one or more motion sensors that detect motion within a structure. The home security system may be configured to distinguish intrusion activity (e.g., a burglar) from robot activity based at least in part on the indication of robot activity.

Devices, methods, and associated information processing for security in a smart-sensored home

For many years, in situ stress in the brittle crust has been measured at relatively shallow depth and related to the mechanical behavior of the crust as inferred from laboratory studies and faulting theory. A continuous profile of the magnitudes and orientations of the three principal stresses has been estimated to depths of 7.7 km and 8.6 km in the German Continental Deep Drilling Program (KTB). This was achieved by hydraulic fracturing tests at relatively shallow depth (1–3 km), estimates of the magnitude of the least horizontal principal stress provided by modified hydraulic fracturing experiments at 6 km and 9 km depths, and analysis of compressional (breakouts) and tensile (drilling-induced tensile wall fractures) failures of the borehole wall over nearly the entire depth of the KTB borehole. The orientation of the maximum horizontal principal stress was found to be uniform with depth with an orientation of N160°±10°E, which is consistent with the average orientation found throughout western Europe. The only significant change in stress orientation was observed directly below a major fault zone crosscutting the borehole. The profile of stress magnitudes we have obtained demonstrates that to a depth of 8 km, the state of stress in the brittle crust in southern Germany is in frictional equilibrium. That is, the ratio of shear to normal stress as resolved on preexisting faults which are well-oriented to the in situ stress field is comparable to their frictional strength based on predictions of Coulomb faulting theory for a coefficient of friction of about 0.7 and near-hydrostatic pore pressure.

https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/96JB02942

Estimation of the complete stress tensor to 8 km depth in the KTB scientific drill holes: Implications for crustal strength

A method of managing a fluid or gas reservoir is disclosed which assimilates (Fig. 4, item 45) diverse data (items 62 and 68) having different acquisition time scales and spatial scales of coverage for iteratively producing a reservoir development plan (item 42) that is used for optimizing an overall performance of the reservoir.

Integrated reservoir optimization

Formation Imaging With Microelectrical Scanning Arrays

The problem of reconstructing a multidimensional field from noisy, limited projection measurements is approached using an object-based stochastic field model. Objects within a cross section are characterized by a finite-dimensional set of parameters, which are estimated directly from limited, noisy projection measurements using maximum likelihood estimation. In Part I, the computational structure and performance of the ML estimation procedure are investigated for the problem of locating a single object in a deterministic background; simulations are also presented. In Part II, the issue of robustness to modeling errors is addressed.

Reconstruction from projections based on detection and estimation of objects--Parts I and II: Performance analysis and robustness analysis

An apparatus and method is presented for establishing electrical connection to permanent downhole oilfield installations using an electrically insulated conducting casing. Current is caused to flow in the casing by a source on the surface connected to the casing. One or more permanent downhole installations are electrically connected to the casing, and the electrical connection to the casing is used to power the downhole installations. The downhole installations also inject a signal into the insulated casing that passes via the casing to a surface readout which detects and records the downhole signals.

Power and signal transmission using insulated conduit for permanent downhole installations

A system and method for evaluating a geological formation is described which compares actual wireline log measurements from a number of wireline logging tools to predicted tool response logs. The system and method uses a forward model of each tool response, given a formation description, to predict a set of wireline logs. Comparing the predicted logs with the actual measured logs yields a mismatch error. The system and method iteratively adjusts the formation description to minimize the mismatch error to obtain a "best" formation description. In one form, the formation description includes petrophysical properties (porosity, density, saturation) and geometry properties (dip, bedding, invasion). In a more complicated form, the formation description also includes a model of petrophysical mixing laws and formation material content. In the special case of a horizontally layered formation and linear tool response models, there exists a computationally efficient version of the system and method.

David J. Rossi

Papers

Integrated reservoir optimization

Formation Imaging With Microelectrical Scanning Arrays

Reconstruction from projections based on detection and estimation of objects--Parts I and II: Performance analysis and robustness analysis

Power and signal transmission using insulated conduit for permanent downhole installations

System and method of petrophysical formation evaluation in heterogeneous formations