In one aspect, a system (5) for use in providing an approximation or estimation of a characteristic (for example, a bulk density value) of a deposit subject to a drilling operation is disclosed. In one form, the system (5) comprises a processor module (25) arranged in operable association with a network of sensors (30) operable for measuring one or more parameters relating to the operation of the drilling assembly (10). The processor module (25) is configured operable for receiving data/information derived from the network of sensors (30), and processing the data/information so as to provide a representation of the incursion (eg. depth of penetration into the relevant deposit) achieved by way of the drilling assembly (10). The processor module (25) is further configured for processing the representation of the incursion with a predetermined relationship that is characteristic of, or unique to, the drilling assembly (10) for providing or allowing an approximation/estimation of the characteristic of the deposit as a function of one or more parameters of the incursion to be made.

Method for characterizing subterranean formation is described. One method involves simulating a poroelastic pressure response of known fracture geometry utilizing a geomechanical model to generate a simulated poroelastic pressure response. Compiling a database of simulated poroelastic pressure responses. Measuring a poroelastic pressure response of the subterranean formation during a hydraulic fracturing operation to generate a measured poroelastic pressure response. Identifying a closest simulated poroelastic pressure response in the library of simulated poroelastic pressure response. Estimating a geometrical parameter of a fracture or fractures in the subterranean formation based on the closest simulated poroelastic pressure response.

A drilling device for surveying front rock-mass intactness of a tunnel face for a tunnel constructed by a TBM and a method using the same are provided. The drilling device includes a drilling assembly, a drill-attitude control assembly, a data monitoring assembly and a TBM-platform fixing seat. The drilling assembly is connected to a TBM hydraulic system to obtain power, to drill the rock mass by an alloy bit through rotation and translation thereof. The drill-attitude control assembly controls an angle, a direction and a position of a drill rod and maintains drilling accuracy and stability. The data monitoring assembly acquires and stores a drilling dynamic-response signal by a high-accuracy sensor and a data recorder, to analyze an intactness characteristic of the rock mass. The TBM-platform fixing seat mounts the drilling device on the TBM.

Systems and methods are disclosed for using downhole plasma discharge effects to determine porosity and/or permeability of formation material. In some embodiments, a method includes determining a concentration of at least one chemical reaction product in a drilling fluid that has interacted with a plasma discharge proximate formation material. A relation between arc and spark of the plasma discharge is determined based, at least in part, on the at least one chemical reaction product, and at least one of porosity and permeability of the formation material is determined based, at least in part, on the relation between arc and spark.

A method can include triggering an assessment of pulse width of an X degree pulse of a downhole NMR tool; responsive to the assessment, determining an optimal pulse width of the X degree pulse; acquiring NMR measurements using the downhole NMR tool and the optimal pulse width; and characterizing a formation using at least a portion of the NMR measurements.

Certain methods to determine wellbore relative permeability ratio from wellbore drilling data are described. A section of a wellbore is drilled in a subterranean zone including a subsurface reservoir in which hydrocarbons are entrapped. The hydrocarbons include a multiphase fluid including oil phase and water phase. A relevant suite of logs of rock in the section of the wellbore is determined. Water saturation is determined from the relevant suite of logs. A relative permeability ratio of the rock in the section to a flow of the oil phase and the water phase is determined. Using the relative permeability ratio, a flow rate of the oil phase or a flow rate of the water phase through the rock is determined.

Systems and methods include a method used in drilling wells. A three-dimensional (3D) uncertainty cube is generated for a subsurface geological structure containing a well target for drilling operations of a well. The 3D uncertainty cube defines an uncertainty of a geological position relative to a 3D structural model. The 3D uncertainty cube is dynamically updated in real time while drilling the well, including parameterizing the 3D uncertainty cube for a distance ahead of a drill bit. A probability that the well target will be hit is determined using the 3D uncertainty cube. The drilling operations of the well are dynamically re-planned and re-steered based on the updated 3D uncertainty cube, including updating a direction of the drilling operations of the well using the 3D uncertainty cube and the probability. Drilling and acquiring new information are continued to iteratively continue dynamic updates and continued drilling.

A system includes a sensor carrier and an integrated data recorder. The sensor carrier includes an outer sub body and an inner sub body. The inner sub body is coupled to the outer sub body by a support leg. The inner sub body includes a recess formed therein. The sensor carrier includes a flow path defined as the space between the outer sub body, the inner sub body, and the support leg. The integrated data recorder is positioned within the recess of the inner sub body such that the integrated data recorder is substantially at the centerline of the sensor carrier. The integrated data recorder includes a sensor package including one or more drilling dynamics sensors, a processor, a memory module, and an electrical energy source.

A system includes a housing configured to be secured to the casing string. The housing has a ring shape defining a central orifice for passage of the fluid and an interior surface facing the central orifice. A reflectometer is mounted on the interior surface and is configured to emit a microwave signal into the fluid in the central orifice, receive a reflected microwave signal from the central orifice, and determine a microwave reflection parameter. An acoustic transceiver is also mounted on the interior surface and is configured to emit an acoustic signal into the fluid in the central orifice, receive a reflected acoustic signal from the central orifice, and determine an acoustic reflection parameter. A processor is configured to determine the property of the fluid from the microwave reflection parameter and the acoustic reflection parameter.

The invention discloses a micro-rotating drilling method in directional drilling, a computer device and a readable storage medium. Including: acquiring rotation speed and torque and on-site drilling information; taking the rotation speed and the torque as a micro-rotating drilling state learning sample, taking the on-site drilling information as a second learning sample, inputting to a neural network control model for training, outputting a micro-rotating drilling algorithm for controlling the top drive; controlling the top drive with the micro-rotating drilling algorithm to achieve the micro-rotation operation. In the invention, an maximum torque and an maximum speed of the top drive can be continuously controlled during the operations such that the drill string can drive the drill tool to drill forward at a preset speed, static frictional resistance exerted on the drill string can be better eliminated.