RU2475642C1 - Method and equipment for hydrodynamic investigations of formations on pipes - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: method of hydrodynamic investigations involves lowering of equipment for investigation of formation with self-contained measuring device by assembly pipes. Interval of investigation is sealed by packer. Arrangement of fluid influx sequence is provided by feed valve, investigated parameters are recorded by self-contained measuring device at the same time. Packers are released, equipment is lifted to wellhead by assembly pipes with further decoding of self-contained measuring device records. Tubing string is preliminary equipped with a seat, in which detachable receive/transmit module is lowered by geophysical cable. Parameters measured by self-contained measuring device are recorded by electromagnetic communication channel in predetermined time mode. Equipment corresponding to the method is also proposed.

EFFECT: improving efficiency of works on formation investigation by formation tester on pipes, improving informativity and speed of decoding or recorded parameters.

2 cl, 1 dwg

Description

The group of inventions relates to the oil industry and can be used in the study of wells by pipe formation testers with the possibility of installing autonomous deep-well instruments.

One way to evaluate reservoirs of oil wells is to test the formation on pipes. A significant drawback of testing the formation on the pipes is the low efficiency of data collection during the test operation. The storage accumulative information devices widely used in downhole equipment solve the problem of the reliability of the measured parameters in the study interval. However, it takes time to extract, read and interpret the accumulated information on the surface, which reduces the efficiency of research.

In this case, hydroimpulse, acoustic telemetry systems and electromagnetic telemetry across the earth’s stratum used in geophysics are ineffective in this case, since they have a low signal transmission rate or low accuracy, depending on the application of noise and / or on the characteristics of the formations surrounding the borehole, as well as on the circulation of the borehole liquids.

An alternative to the known two-way communication methods for transmitting measurement and control information between downhole and ground-based equipment during the formation study are:

- the use of inductive couplings in the drill string (RF, patent No. 2140537, E21B 47/022, 1999), which ensures high efficiency of information transfer. However, the known method is economically disadvantageous, since the implementation of this method requires expensive equipment with special requirements for operation and maintenance;

- reception / transmission of geophysical information via wireless electromagnetic

a communication channel from the bottom face to the surface (USA, patent 5 945 923, G01V 3/00, 1999) - an economical and easy to implement method. The disadvantage of this method is the low information content, since information on the distribution of rock properties along the studied interval is not controlled, which, in the presence of heterogeneities of the rock by petrophysical parameters, leads to some averaged research results.

The objective of the present invention is to increase the efficiency of work on the study of the formation by reservoir testers on pipes, increasing the information content and decoding speed of recorded parameters.

The problem is solved as follows.

According to the method of conducting hydrodynamic studies of reservoirs on pipes, including descent on pipes in the interval of studying the layout of equipment for researching the reservoir with an autonomous type meter, sealing the research interval with a packer, creating, through a valve system, a sequence of fluid inflows with simultaneous recording of the parameters under study using an autonomous type meter, unpacking the research interval at the end of the research and extraction according to the invention, the pipe string is pre-equipped with a mounting socket installed above the packer, and in the process of research, a removable transmitter-receiver module is lowered into the landing socket on the geophysical cable and the measured parameters are recorded from the meter autonomous type in a given time mode, and the launch of the meter autonomous type is carried out by a pressure pulse arising at the time of opening thia valve system.

In the equipment for researching strata on pipes containing pipes, a filter, a packer, a stratum tester, sensors of the studied parameters, a valve system and an autonomous type meter, according to the invention, the sensors of the studied parameters are installed in the filter region inside or outside of the latter, spaced apart relative to each other along the longitudinal axis of the device . In this case, the number of sensors is equal to the number of study intervals, and each sensor is installed opposite its study interval and is electrically connected via a transit line to an autonomous type meter. The equipment is additionally equipped with a landing jack installed above the packer and a removable transceiver module lowered into the landing jack on a geophysical cable, the free end of which is connected to the ground recording device.

The proposed method for conducting hydrodynamic studies of formations on pipes and equipment for its implementation have the following distinctive features from analogues and prototype:

- wireless communication channel - provides without complicating the design, increasing the speed, accuracy and reliability of information transfer, excluding the influence of related factors - noise, environmental conditions, etc .;

- registration and decryption in real time - provide increased decision-making efficiency, reduced downtime of the well;

- combined communication channel - provides enhanced functionality, namely - the ability to work both in real time and with delayed decryption of the accumulated information depending on the task of research;

- data is downloaded from the downhole device due to a single connection, which makes communication faster than using multiple connections;

- a removable transceiver module on a geophysical cable increases the efficiency of the study, reduces the downtime of the well, as it provides the ability to extract information accumulated by an autonomous type meter directly during testing, without stopping the well;

- the placement of each of the sensors in the region of its research interval provides direct contact of the sensors with the medium being studied, increasing the information content of the studied parameter and the speed of its registration;

- the operation of the autonomous type meter is carried out by a pressure pulse that occurs only during the open test period, which allows you to economically consume the battery capacity of the autonomous type meter, that is, it extends the life of the autonomous type meter in the well without recharging or replacing the power battery.

The drawing shows a variant of the layout of equipment for implementing the method of conducting hydrodynamic studies of reservoirs on pipes.

The equipment is a drill pipe / tubing string 1 equipped with a filter 2 in the lower part, above which a stand-alone type 3 meter equipped with a battery is installed in the string 1 (not shown in the drawing). In the cavity of the filter 2, sensors 4 of hydrogeological parameters (pressure, temperature, flow composition, etc.) are mounted, spaced apart from each other, along the axis of the filter and electrically connected to the cable entry device 5 at the end of the filter 2. Stand-alone type meter 3 an electric cable 6 is connected to the sensors 4 via a cable entry device 5; Above the stand-alone meter 3, a shut-off valve 7 is installed in column 1, above which a mounting socket 8 is mounted to accommodate a removable transceiver the receiving device 9. The transceiver 9 descends into the column 1 on the geophysical cable 10, the free end of which is connected to the ground recorder 11. The column 1 is fixed in the borehole with a packer - an anchor 12. The transceiver 9 is fixed in the landing socket 8 mechanically or using electrically controlled retractable hooks in the design of the landing socket 8 (not shown in Fig.).

In practice, the proposed method for conducting hydrodynamic studies of formations in pipes is implemented as follows.

An assembly consisting of a filter 2 with sensors 4 of geological parameters, a packer (or packer-anchor) 12 with an electric cable 6 laid inside to connect the sensors 4 to a stand-alone type 3 meter via a cable device is lowered into a well on a drill string 1 of drill / tubing pipes input 5, an autonomous type 3 meter, a formation tester in the form of a shut-off and rotary valve 7 and a landing socket 8. Launched to the research interval, the layout is fixed in the well by the packer-anchor 12, thereby disconnecting sub-packer zone from the rest of the wellbore. Then the shut-off valve 7 is opened, thereby communicating the under-packer zone with the internal cavity of the column 1 (first open period). During this period, the sensors 4 register the studied parameters and record them in an autonomous type 3 meter. Depending on the task, during the first open period or after the well is closed to restore pressure (closed period), the transceiver is lowered into the column 1 on the geophysical cable 10 9, associated with a surface recorder 11 at the wellhead. The transceiver 9 is fixed in the seat socket 8. According to the pulse of hydraulic pressure at the moment of opening the shut-off and rotary valve 7 (in the first or subsequent open period), the stand-alone type meter 3 begins to transmit data from sensors 4 (starting from the top with respect to the filter) in the form of electromagnetic signals, which are then transmitted via a geophysical cable 10 to the ground-based recorder 11. Control commands from the ground-based recorder 11 by means of a transceiver 9 provide sequentially five poll sensors 4 and produce their survey in real time.

The transceiver 9 can be equipped with additional sensors for monitoring geophysical parameters, data from which are also transmitted through a geophysical cable 10 to a ground-based recorder 11, which in turn allows you to expand the amount of information about the studied formation.

Thus, the proposed combined method of receiving and transmitting information about the studied interval of the reservoir

- will optimize the research process,

- significantly increase the reliability and speed of reading and processing the information received,

- the practical implementation of the proposed method is economical, does not require special expensive equipment and materials.

Claims (2)

1. A method of conducting hydrodynamic studies of reservoirs on pipes, including descent on pipes in the interval of studying the layout of equipment for researching the reservoir with a self-contained type meter, sealing the test interval with a packer, creating a sequence of fluid inflows using the inlet valve and simultaneously registering the studied parameters using a self-contained type meter unpacking the research interval at the end of the research and extraction on pipes arrangement of equipment at the wellhead with subsequent decoding of the records of an autonomous type meter, characterized in that the pipe string is pre-equipped with a mounting socket installed above the packer, and during research, a removable transceiver module is lowered into the landing socket on the geophysical cable and the measured parameters are recorded from the stand-alone meter type on the electromagnetic communication channel in a given time mode, while the launch of the autonomous type meter is carried out by a pressure pulse Niya, appearing at the opening of the intake valve. 2. Equipment for the study of reservoirs on pipes, containing pipes, a filter, a packer, a reservoir tester, sensors of the studied parameters, an inlet valve and an autonomous type meter, characterized in that the sensors of the studied parameters are installed in the filter region inside and / or outside the latter and are spaced relatively each other along the longitudinal axis of the device, while the number of sensors is equal to the number of study intervals, each sensor is installed opposite its study interval and is electrically connected via a transit line and with an autonomous type meter, and the equipment is additionally equipped with a landing jack installed above the packer and a removable transceiver module lowered into the landing jack on a geophysical cable, the free end of which is connected to a ground recording device.

Images