Patent application number | Description | Published |
20110154896 | APPARATUS FOR A BOREHOLE INFLUX FLUID PARAMETERS MEASUREMENT - The apparatus for a borehole influx fluid parameters measurement comprises an enclosure open on two adjacent sides and having a poorly deformable heat-insulating rear wall, a cover and side walls made of elastically deformable heat-insulating material. Inside the enclosure a cellular structure of elastically deformable heat-insulating material is mounted with the gap relative to the enclosure's rear wall and having the through cells insulated from one another. Said cells forming the apparatus inlet openings on one side of the cellular structure and on the other side they are connected with the gap, the total area of the inlet openings significantly exceeds the area of the structure side surface they are located at. The transducers for the measurement of the influx fluid parameters are disposed inside the cells. | 06-30-2011 |
20110156707 | METHOD OF STUDYING ROCK MASS PROPERTIES AND APPARATUS FOR THE IMPLEMENTATION THEREOF - The rock mass thermal excitation is performed by means of pumping the flush fluid through the wellbore using a tubing string, the flush fluid temperature differs from the rock mass temperature. Before the thermal excitation, during the thermal excitation and after the termination thereof differential electrical signals proportional to the well bore temperature difference are registered by at least one pair of the temperature transducers positioned along the wellbore axis. The distances between the transducers in the pairs and the number of pairs is selected in advance based on the required accuracy of the determination of the rock mass areas with different properties, minimum and maximum possible length of the rock mass areas identified and the nature and degree of the wellbore temperature noise. Differential electrical signals of the temperature transducers measured before the rock mass excitation start are compared with the differential electrical signals from the same temperature transducers measured during the thermal excitation and the differential electrical signals of different temperature transducers positioned along the wellbore are compared with one another. Based on the comparison results of the differential electrical signals the difference of different rock mass areas are characterized by their properties and the boundaries between the rock mass areas with different properties are identified. | 06-30-2011 |
20120103600 | METHOD OF DETERMINATION OF FLUID INFLUX PROFILE AND NEAR-WELLBORE SPACE PARAMETERS - Method for determination of a fluid influx profile and near-wellbore area parameters comprises measuring a first bottomhole pressure and operating a well at a constant production rate. After changing the production rate a second bottomhole pressure is measured together with a fluid influx temperature for each productive layer. Relative production rates and skin factors of the productive layers are calculated from measured fluid influx temperatures and measured first and second bottomhole pressures. | 05-03-2012 |
20120103601 | METHOD OF DETERMINATION OF FLUID INFLUX PROFILE AND NEAR-WELLBORE SPACE PARAMETERS - Method for determination of a fluid influx profile and near-wellbore area parameters comprises measuring a first bottomhole pressure and after operating a well at a constant production rate changing the production rate and measuring a second bottomhole pressure. A wellbore fluid temperature over an upper boundary of a lowest productive layer and wellbore fluid temperatures above and below other productive layers are measured and relative production rates and skin factors of the productive layers are calculated from measured wellbore fluid temperatures and measured first and second bottomhole pressures. | 05-03-2012 |
20130138348 | METHOD FOR DETERMINING THE PROFILE OF AN INFLOW AND THE PARAMETERS OF A WELL-SURROUNDING AREA IN A MULTIPAY WELL - A method for the determination of an inflow profile and bottom-hole area parameters (perforation zone parameters, bottom-hole area pollution parameters) in a multipay well comprises changing a production rate and measuring a temperature of a fluid flowing into the well as a function of time for each pay zone. Then a derivative of this temperature with respect to a logarithm of a time passed after the well production rate has been changed for each pay zone is determined. An inflow profile and other parameters are calculated based on a value of said derivative when it becomes constant and on a time after which the value of the derivative becomes constant. | 05-30-2013 |
20130206399 | METHOD FOR PREHEATING AN OIL-SATURATED FORMATION - Method for preheating an oil reservoir comprises injecting saturated or superheated steam at an initial injection pressure into a tubing placed inside a well drilled in the oil reservoir. Steam temperature at an outlet of the tubing is measured and a heat flow from the well to the oil reservoir is calculated. An optimal steam injection rate when steam quality of the injected steam at the tubing outlet becomes greater than zero, is calculated, the optimal steam injection rate ensuring compensation of the heat flow from the well to the oil reservoir with the heat of steam condensation. A steam injection rate is decreased to the calculated optimal steam injection rate value by decreasing the initial injection pressure providing constant temperature at the outlet of the tubing. | 08-15-2013 |
20140288836 | METHOD FOR DETERMINING THE INFLOW PROFILE OF FLUIDS OF MULTILAYER DEPOSITS - A method for determining the profile of fluids inflowing into multi-zone reservoirs provides for a temperature measurement in a wellbore during the return of the wellbore to thermal equilibrium after drilling and determining a temperature of the fluids inflowing into the wellbore from each pay zone after perforation at an initial stage of production. Specific flow rate for each pay zone is determined by a rate of change of the measured temperatures. | 09-25-2014 |
20150053398 | METHOD FOR DETERMINING AN INFLOW PROFILE OF MULTILAYER RESERVOIR FLUIDS IN A WELLBORE - Methods for determining an inflow profile of multilayer reservoir fluids in a wellbore are described herein. A bottom-hole zone is cooled before well perforation. Then, the wellbore is perforated, and a flow temperature is measured in the wellbore above each perforation zone. A production rate of each productive layer is determined taking into account thicknesses of the perforation zones and using results of temperature measurements acquired in a period between an end of an initial production stage characterized by strong impact of a volume of the wellbore and quick flow temperature changes in the wellbore, and a time when the bottom-hole zone cooling effect on the temperature measurements becomes insignificant. | 02-26-2015 |