摘要:
Systems and methods are provided for determining a property, e.g., density, of a geological formation based on Einstein's theory of gravitation. A gravitational potential difference is determined between two positions of the geological formation by measuring a frequency shift of radiation travelling from a source to an absorber of a differential gravimeter. The differential gravimeter can be a part of a downhole tool. The gravitational potential difference determined can be used to determine the property of the geological formation.
摘要:
A Coriolis flow meter for measuring a liquid volume fraction of a multiphase flow. The Coriolis meter includes a vibrating measurement conduit through which the multiphase flow, a wet gas flow or the like, is flowed and measured and/or analyzed. Operation of the Coriolis flow meter includes obtaining a measure of the input energy required to vibrate the conduit and a measure of the vibrational energy of the conduit, and determining the liquid volume fraction of the wet gas flow from the input energy and the vibrational energy. The liquid volume fraction may be used to correct other measurements made by the Coriolis flow meter such as density or mass flow rate.
摘要:
A separator is described as provided with a gas/liquid separator vessel, a sight glass, and a carry-over meter. The sight glass is positioned on the exterior of the gas/liquid separator vessel, and has a first inlet and a second inlet in fluid communication with a separation chamber of the gas/liquid separator vessel. The sight glass is further provided with a first outlet in fluid communication with the first inlet, and a second outlet in fluid communication with the second inlet. The sight glass has a tube extending between the first inlet and the second inlet with at least a portion of the tube being transparent to light in a visible range of wavelengths. The carry-over meter is provided with a first densitometer connected to the first outlet of the sight glass via piping and a second densitometer connected to the second outlet of the sight glass via piping.
摘要:
Systems and devices are provided that relate to a gas-filled radiation detector with an internal optical fiber (50). The internal optical fiber (50) may detect photons (59) emitted during ionization avalanche events triggered by incident radiation. Such a radiation detector may include a housing, a fill gas (48) within the housing, and an optical fiber (50)within the housing. The fill gas may interact with radiation through an ionization avalanche that produces light. The optical fiber (50) within the housing may capture the light and transmit the light out of the housing.
摘要:
An electronic assembly for use in a downhole module may include a multilayer ceramic assembly and an electronic component disposed on the multilayer ceramic assembly. The multilayer ceramic assembly includes a ceramic substrate, a nickel plating layer disposed on the ceramic substrate and a gold plating layer having a thickness of less than about 0.5 microns disposed on the nickel plating layer. A wirebond such as an aluminum wirebond extends between the electronic component and the gold plating layer.
摘要:
Systems and methods for estimating standoff and/or caliper in a wellbore for oil-based mud drilling are provided. The systems include a sensor having a primary electrode and at least two secondary electrodes, and an electronics subsystem having a controller and a processor for driving the system and correlating current measurements with standoff and/or caliper. The electrodes are positioned relative to one another such that there is a distinct flow of current between the primary electrode and each secondary electrode. In operation, a single excitation frequency is applied to the primary electrode and a simultaneous measurement of current flowing between the primary electrode and each secondary electrode is obtained. Standoff is estimated from the measurements. The estimations can be independent of formation properties when an appropriate excitation frequency is used.
摘要:
An apparatus is made of a surface communication system for communicating wirelessly with a first wireless modem mounted within a section of tubing, and configured to communicate wirelessly with a second wireless modem through a tubing including the section of tubing and within a well at a distance in excess of 500 feet , comprising: a transceiver assembly adapted to be positioned on the section of tubing and in close proximity with the first wireless modem; transmitter electronics configured to provide low power signals to the transceiver assembly to cause the transceiver assembly to generate low power wireless signals into the section of tubing to be received and interpreted by the first wireless modem; and receiver electronics configured to receive and interpret high power signals from the transceiver assembly.
摘要:
A chassis assembly is disclosed for housing at least one circuit board. The chassis has a first chassis part, a second chassis part, and at least three shock absorbers. The first chassis part has a first end and a second end, and a first external surface extending between the first end and the second end. The first chassis part also has a first longitudinal axis extending from the first end to the second end. The second chassis part has a third end and a fourth end and a second external surface extending between the third end and the fourth end. The second chassis pat has a second longitudinal axis extending from the third end to the fourth end. The first and second chassis parts are adapted to cooperate to secure the at least one circuit board within a boundary defined by the first and second external surfaces. The at least three shock absorbers are positioned on the external surfaces of the first and second chassis parts. At least one shock absorber is positioned on the first external surface and extends along the first longitudinal axis between the first end and the second end. At least two shock absorbers are positioned on the second external surface and extend along the second longitudinal axis between the third end and the fourth end. The at least three shock absorbers extend beyond the first and second external surfaces.
摘要:
Inductive couplers for use in a downhole environment are described. An example inductive coupler for use in a downhole environment includes a body defining a cavity and magnetic material positioned in the cavity. The example inductive coupler also includes a coil adjacent the magnetic material, the coil formed with a number of turns of wire, and a first metal cover coupled to the body to enclose the cavity. The metal cover being electrically coupled to the body to form a substantially contiguous electrically conductive surface surrounding the cavity.
摘要:
An apparatus for determining fluid phase fraction of a multiphase fluid mixture (13) comprising: - an x-ray generator (20) arranged to emit an x-ray Bremsstrahlung radiation spectrum comprising a low energy and a high energy region; - a pipe section (27) through which the multiphase fluid mixture (13) flows comprising a measurement section (28), said measurement section (28) being coupled to said x-ray generator (20); - a detector (30) coupled to said measurement section (28) and arranged to detect x-ray radiation that has passed through said multiphase fluid mixture (13), the detector (30) being coupled to a multichannel analyzer (32) producing a measurement output comprising a low energy (LE) and high energy (HE) measurement counts as well as low energy (LV) and high energy (HV) control counts from said detected x-ray radiation; wherein the apparatus further comprises an electrical parameter control arrangement (33) coupled to the x-ray generator (20) and the detector (30), the electrical parameter control arrangement (33) being arranged to calculate a first ratio of the high energy control count relative to the low energy control count (R V =HV/LV) and a second ratio of the high energy measurement count relative to the low energy measurement count (R E =HE/LE), and to adjust the electrical operation of the x-ray generator (20) based on an electrical parameter control function (F C (V)) of said ratios that minimizes a dependence of the electrical operation of the x-ray generator on the fluid phase fraction of the multiphase fluid mixture (13) flowing in the measurement section (28).