RU2077735C1 - Information support system for oil field development - Google Patents

Abstract

FIELD: petroleum geophysics. SUBSTANCE: system is designed to acquire and record information from detectors of well device 1 suspended in a well by a logging cable. Device 1 has pressure 2, fluid composition 3, discharge 4, temperature 5 and collar locator 6 pickups. To obtain information about operation of a well sucker-rod pump, gas content of fluid being produced , open-hole pressure and buffer pressure, surface parameter unit 7 is mounted as a part of surface service facilities. Unit 7 has force transducer 8, gas factor analyzer pickup 9, buffer pressure pickup 10 and open- hole pressure pickup 11. Operation of device 1 and unit 7 is controlled by ground-based equipment unit 12. Information from the pickups together with its arrival time are recorded and stored in memory 18 of unit 12 until it is read out onto magnetic media of a board computer in well-logging set 16. EFFECT: more operative acquisition of an optimal body of information about operation of oil pool and production equipment on oil wells during their overhaul periods. 1 dwg

Description

 The invention relates to field geophysics and can be used in geophysical and hydrodynamic studies of oil wells, including those equipped with electric centrifugal and well sucker rod pumps. It can also be used in studies of hydrogeological wells.

Currently known downhole recorders with solid-state processor and programmable scanning speed [1]
The disadvantages are the lack of a communication channel between the recorder and ground units, which does not allow for quick reading of information without lifting it to the surface, and the inability to move the system along the wellbore to obtain information on the well as a function of depth.

Closest to the invention is a logging station that provides various modes of telemetry, control and signaling during well testing through the use of integrated downhole and ground equipment, including a block of switching inserts, a telemetry block, a flow direction controller, an error protection block, a memory block, calculator, automation unit, depth controller, analyzer unit and sampler [2]
The downhole tool, depending on the number of measured physical quantities in the hydrodynamic model of the study of existing wells, includes the corresponding number of sensitive elements of the depth transducers of temperature, pressure, speed and composition of flow impurities, made in the form of multifunction sensors. The device also contains a turntable speed sensor designed to determine the direction of fluid flow. This logging station allows you to expand the functionality and improve the accuracy of well logging.

 However, the station does not have the possibility of autonomous operation in various modes, the choice of which should be carried out under the control of a computer or independently, depending on the category of wells being studied and the tasks to be solved. Another disadvantage is the low reliability of the turntable speed sensor, which will not ensure its operation during the overhaul period of the wells (300-350 days).

 The absence in the station of the appropriate sensors and a communication module with them does not allow using it to obtain information about the operation of technological equipment of wells.

 The aim of the invention is to quickly obtain the optimal amount of information about the operation of the oil reservoir and technological equipment in the wells of the field throughout the entire overhaul period of the wells, regardless of their method of operation and purpose without lifting the devices to the surface.

 This is achieved by the fact that the oil field development support system, comprising a downhole tool suspended on a geophysical cable in a specified interval of the wellbore and a block of ground equipment connected to it via a wireline, further comprises a surface parameters measuring unit, including a dynamometer, gas factor analyzer, sensors buffer and annular pressures, connected via an armored cable to a block of ground equipment containing a communication module with sensors, bl ok control, a storage device, a communication module with a computer, a display unit for parameters and a communication module with telesystems, and the downhole tool further comprises a pressure sensor, a liquid composition of a fluid flow rate, a temperature and a locator of couplings.

 The drawing shows a block diagram of an information support system.

 The system contains a downhole device 1, designed to measure reservoir and bottomhole pressures, determine the composition, flow rate and temperature of the produced fluid, as well as depth reference. For measuring pressure on the buffer and in the annulus, determining the gas factor and registering dynamograms, a measuring unit of surface parameters is used. Power supply of the downhole instrument and the measuring unit of surface parameters with electric current, software control of their operation, collection, storage and transmission of information is carried out using the block 12 of ground equipment.

 The system operates as follows.

 The downhole tool 1, which incorporates highly reliable sensors 2, 3, 4, 5, respectively, of the pressure, fluid composition, fluid flow rate, temperature and locator 6 of the couplings, using existing technologies, is lowered into the well on a geophysical cable together with the downhole pump and suspended below reception pump in a predetermined interval for the entire overhaul period. If it is necessary to obtain information about the operation of a downhole sucker-rod pump, the gas content in the produced fluid, the pressure on the buffer and in the annulus, the corresponding sensors are mounted on the surface of the production equipment of the well: dynamometer, gas factor analyzer 9, 10 buffer and 11 annular pressure sensors (measuring block 7 of surface parameters).

 Block 12 of the ground equipment is mounted in a metal container at the wellhead and, through a communication module 13 with primary transducers (sensors), is electrically connected to the depth device 1 and the measuring unit 7 of surface parameters via communication lines from the geophysical cable 14 and armored wire 15. The unit is powered from the AC mains, and in the event of a power failure, the system is powered by the battery, which allows it to remain operational for five days. Block 12 ground equipment provides the system in five modes, four of which are autonomous and one is controlled by an onboard computer installed in the laboratory of the logging station 16.

 When operating in mode I, designed to record the daily parameters of the well, the command for its execution is given from the onboard computer, after which the latter is disconnected. Further control over the operation of the system is carried out by the control unit 17, which once a day for one minute with a period of one second receives signals from the downhole device 1 converted to digital form from the outputs of the pressure sensors, fluid composition, flow rate and temperature. In a similar way, information is received from dynamometer sensors 6, gas factor analyzer 9, buffer pressure sensor 10 and annular pressure sensor 11 of the measuring unit 7 of surface parameters. From the 60 measured values of each of the parameters, the averages are calculated and written to the storage device 18 for storage until they are read onto the magnetic media of the on-board computer. The memory also records and stores the month, day of the month, hours, minutes and seconds of receiving information.

 The execution of mode II, designed to obtain information about changes in bottomhole pressure, is performed during an emergency or special shutdown of the mains voltage of the well. The system switches to autonomous power supply from the battery, which is a command to take readings from pressure sensors of the downhole tool 1 and sensors of the measuring unit 7 of surface parameters. The time intervals between the readings of the downhole tool are a function of changing the bottomhole pressure, and the signals from surface sensors are recorded periodically after four hours. In the storage device 18 are recorded pressure values, date and time of taking samples. After supplying the mains voltage, the system automatically switches to work in mode I. When the storage device is filled with the specified number of samples, each subsequent disconnection of the mains voltage is a command to switch to the information storage mode.

 In mode III, designed to study the wells commissioned, equipped with electric centrifugal pumps, taking readings from all sensors of the downhole tool 1, as well as pressure sensors 10 and 11 and the gas factor analyzer 9 of the measuring unit 7 of the surface parameters is performed, as in mode II. The execution of the mode begins at the command of the on-board computer, after which it is turned off. The recording of the values of the measured parameters, the date and time of their receipt in the storage device 18 continues until the last 3000th count of the deep parameters is filled, after which the system switches to the information storage mode. In case of disconnection of the mains voltage, the system automatically switches to the execution of mode II, and when it is supplied, it returns to the execution of mode III.

 During the start-up of wells equipped with borehole sucker rod pumps, which are characterized by a periodic change in the measured parameters, the system, on command from a computer, is put into operation in 1U mode. This mode is identical to mode III except that the time intervals between taking samples from the downhole tool 1 are a function of changing the average values of the bottomhole pressures calculated from 60 samples taken during the minute, which together with the average values of the remaining depth parameters, their date and time withdrawals are recorded in the storage device 18.

 When the system is operating in Y mode, a part of the geophysical cable 14 located on the surface is disconnected from the ground equipment block 12 and wound onto the winch drum of the logging elevator 19. The latter is connected to the block 12 using a special wire 20, thereby forming a communication line between the latter and the downhole tool 1. To the block of ground equipment through the communication module with the computer 21 through the communication line 22 is also connected to the laboratory of the logging station 16. The mode is performed under the control of the onboard computer and consists in reg isration of all depth parameters (pressure, flow, composition, temperature) as a function of depth. To bind the measurement results to the geological section, the signals from the locator of couplings 6 are recorded. In the process of hoisting operations of the downhole tool 1, information from all sensors is recorded in the memory of the onboard computer. Surface parameters are not recorded in this mode.

 The system provides for the possibility of visual monitoring on the display unit of 23 parameters recorded in the storage device 18, reading them into the computer memory at the well, as well as via radio or wired communication channels using the communication module with the telesystem 24.

Claims (1)

1 An oilfield development information support system, comprising a downhole tool suspended on a geophysical cable in a predetermined interval of the wellbore and connected to it by a wireline unit, the surface equipment unit, characterized in that the system further comprises a surface parameters measuring unit including a dynamometer, gas factor analyzer, buffer and annular pressure sensors connected via an armored cable to a block of ground equipment containing a mode s connection to the sensors, control unit, memory unit, communication with a computer module, and a block parameter indicating communication module with telemetry and depth instrument further comprises a pressure sensor, fluid composition, fluid flow rate, temperature and collar locator.