CN114165166A

CN114165166A - Test tubular column

Info

Publication number: CN114165166A
Application number: CN202010841275.3A
Authority: CN
Inventors: 高飞明; 王金忠; 吴琼; 黄欣; 王玲玲; 王芳; 邱贻旺
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2020-08-20
Filing date: 2020-08-20
Publication date: 2022-03-11

Abstract

The application discloses test tubular column belongs to oil field tubular column test equipment in pit and test technical field. The test string includes two at least sub-strings, and every sub-string has the hydrocarbon reservoir that has perforated including consecutive packer, multi-parameter tester and switch ware between two adjacent packers, multi-parameter tester is used for acquireing temperature, pressure, moisture and the flow that corresponds the hydrocarbon reservoir, the switch ware is used for controlling the hydrocarbon reservoir that corresponds and produces or stop production. The test pipe column can realize industrial profile test and single-layer section pressure recovery test under the condition that an oil well does not stop production, truly reflects the production condition of each oil-gas layer, and effectively guides the production development of the oil field.

Description

Test tubular column

Technical Field

The application relates to the technical field of oilfield downhole string testing equipment and testing, in particular to a testing string.

Background

Water flooding development is one of the main means for increasing and stabilizing oil yield in the middle and later stages of oil field development. The influence of the water injection well on each oil and gas layer of the production well is usually obtained through testing under the influence of the geological conditions of multiple layer systems and complex fault block oil reservoirs of the oil field, so that the layered exploitation dynamics of the oil well is clarified, and data support is provided for adjusting or improving development strategies.

Currently, the liquid production conditions of each oil and gas layer of an oil well, such as liquid production amount, water content and the like, are obtained through a liquid production profile test; and obtaining the geological condition of the target layer through a pressure recovery test.

However, conventional pressure recovery tests cannot account for stratification parameters and are affected by well-reservoir effects; the conventional pressure recovery test can not be carried out in the high-inclination oil well, the original production pipe column needs to be taken out for the liquid production profile test of the high-inclination oil well, and a special gas lift test pipe column needs to be put in, so that the accuracy of the test result is not high, and the production development of the oil field is difficult to effectively guide.

Disclosure of Invention

In view of this, the application provides a test string, can realize producing the liquid profile test and testing of single-deck section pressure recovery under the condition that the oil well does not stop production, and the production condition of each hydrocarbon reservoir is truly reflected, effectively guides the production development of oil field.

Specifically, the method comprises the following technical scheme:

the embodiment of the application provides a test string, test string includes: at least two sub-tubular columns are arranged in the tubular column,

each sub-string comprises a packer, a multi-parameter tester and a switch which are sequentially connected through an oil pipe, and a perforated oil-gas layer is arranged between every two adjacent packers;

the multi-parameter tester comprises a first shell, a first fixing piece, a first power supply assembly, a first circuit board, a pressure sensor, a water-containing sensor, a turbine sensor and a temperature sensor, wherein the first fixing piece, the first power supply assembly, the first circuit board, the pressure sensor, the water-containing sensor, the turbine and the turbine sensor are positioned in the first shell; the first shell is positioned in the oil pipe; the first power supply assembly, the first circuit board, the pressure sensor, the temperature sensor, the moisture sensor, the turbine sensor and the turbine are sequentially fixed on the first fixing member, the first power supply assembly is electrically connected with the first circuit board, and the pressure sensor, the temperature sensor, the moisture sensor and the turbine sensor are electrically connected with the first circuit board; one end of the pressure sensor and one end of the temperature sensor are respectively contacted with the external environment through the first shell; a plurality of first through grooves are formed in the first shell located on the outer side of the moisture sensor;

the switch comprises a second shell, a liquid inlet piece, a second fixing piece, a second power supply assembly, a second circuit board, a driving motor, a first limit switch, a second limit switch and a transmission screw rod, wherein the second fixing piece, the second power supply assembly, the second circuit board, the driving motor, the first limit switch, the second limit switch and the transmission screw rod are positioned in the second shell; one end of the second shell is positioned in the liquid inlet piece and is connected with the liquid inlet piece; the second shell is positioned in the oil pipe, and the second power supply assembly, the second circuit board, the driving motor and the transmission lead screw are sequentially fixed on the second fixing piece; the first limit switch and the second limit switch are also fixed on the second fixing piece and are not arranged outside the transmission lead screw, the transmission lead screw is provided with a first bulge and a second bulge, the first bulge is used for opening or closing the first limit switch, and the second bulge is used for opening or closing the second limit switch; the second power supply assembly is electrically connected with the second circuit board and the driving motor respectively, the driving motor, the first limit switch and the second limit switch are electrically connected with the second circuit board, and the transmission screw rod is connected with the driving motor; one end of the transmission screw rod, which is far away from the driving motor, is provided with a piston, the liquid inlet piece is provided with a liquid inlet channel and a cavity, and the piston is movably positioned in the cavity and can control the liquid inlet channel to be communicated with the cavity; and a plurality of second through grooves are formed in the second shell on the outer side of the transmission screw rod and communicated with the cavity.

In one possible design, the multi-parameter tester further includes a connector and a first joint, wherein,

the connecting piece is positioned at one end of the first shell, which is close to the turbine, and is detachably arranged in the first joint;

the inside of connecting piece and the inside of first joint all are hollow and intercommunication each other.

In one possible design, the multi-parameter tester further includes a first cap located at an end of the first housing away from the turbine.

In one possible embodiment, the inlet piece has a perforated plate, which is located at the inlet of the inlet channel.

In a possible design, the liquid inlet piece is further provided with a pressure gauge interface and a formation pressure transmission channel which are communicated with each other, the formation pressure transmission channel is communicated with the liquid inlet channel, and the pressure gauge interface is used for connecting a pressure gauge.

In one possible design, the switch device further includes a thrust bearing fixed to the second fixing member and located between the second circuit board and the drive screw.

In a possible design, the switch further includes a second cap, and the second cap is located at an end of the second housing away from the liquid inlet.

In one possible design, each of the sub-strings further includes a centralizer, the centralizer being located between the packer and the multi-parameter tester.

In one possible design, each sub-string further includes a first release sub or plug connected to the switch by tubing.

In one possible design, the test string further includes a second sub-sub connected to the packer of the sub-string via tubing.

The technical scheme provided by the embodiment of the application has the beneficial effects that at least:

at least two sub-tubular columns with multi-parameter testers and switches are arranged in the test tubular column, so that one sub-tubular column corresponds to one oil-gas layer.

Because the driving motor in the switch can be started or closed under the control of the second circuit board, the starting time of the driving motor can be set on the second circuit board before the testing pipe column is put into the testing pipe column. When the driving motor is started and drives the transmission screw rod to drive the piston to move downwards, and the first bump on the transmission screw rod is far away from the first limit switch, the first limit switch is closed; in the process that the transmission screw rod moves downwards, when the liquid inlet channel of the liquid inlet piece is communicated with the cavity, liquid in the oil gas layer corresponding to the sub-tubular column can move upwards through the liquid inlet channel, the cavity and the second through groove on the second shell, and the oil gas layer is in a production state; when the second protrusion on the transmission screw rod contacts the second limit switch, the second limit switch is turned on, the driving motor is powered off, and the switch is always in a production state. When the driving motor is started and drives the transmission screw to drive the piston to move upwards, and the second protrusion is far away from the second limit switch, the second limit switch is closed; in the process that the transmission screw rod moves upwards, when the liquid inlet channel is not communicated with the cavity, the oil-gas layer is in a production stopping state; when the first protrusion contacts the first limit switch, the first limit switch is turned on, the driving motor is powered off, and the oil-gas reservoir is controlled to be in a production stop state.

Because the multi-parameter tester is positioned in the oil pipe at the upper part of the switch and comprises the pressure sensor, the water content sensor, the turbine and turbine sensor and the temperature sensor, when the switch is in an opening state, liquid passing through the switch can flow out of the first shell from the first through groove after passing through the turbine and the water content sensor, the flow is measured by the turbine sensor, the water content is measured by the water content sensor, the liquid flowing out of the first through groove can continuously move upwards in the oil pipe, and the pressure and the temperature of the liquid are measured when the liquid passes through the pressure sensor and the temperature sensor. The multi-parameter tester can measure parameters such as flow, water content, temperature, pressure and the like of the corresponding oil-gas reservoir.

When a preset oil well needs to be subjected to a liquid production profile test, all switches of the well are only required to be ensured to be in an open state; when the single-layer section pressure recovery test needs to be carried out on the preset hydrocarbon reservoir, the switch of the sub-string corresponding to the reservoir only needs to be closed, so that the oil well does not need to be stopped, the liquid production profile test and the pressure recovery test can be carried out on each hydrocarbon reservoir, the production condition of each hydrocarbon reservoir can be truly reflected, and the production development of the oil field is effectively guided.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a test string provided in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of another test string provided in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a multiparameter tester in a test string according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a switch in a test tube column according to an embodiment of the present disclosure;

FIG. 5 is a bottom view of a liquid inlet member in a test column according to an embodiment of the present disclosure;

fig. 6 is a flowchart of a method for using a test string according to an embodiment of the present disclosure.

The reference numerals in the figures are denoted respectively by:

1-a sub-pipe column is arranged,

11-a packer-the packer being,

12-multiparameter tester, 121-first housing, 12101-first through slot, 12102-first sub-housing, 12103-second sub-housing, 122-first fixture, 123-first power supply assembly, 124-first circuit board, 125-pressure sensor, 126-water sensor, 127-turbine, 128-turbine sensor, 129-temperature sensor, 1210-connector, 1211-first connector, 1212-first cap,

13-a switch, 131-a second shell, 13101-a second through groove, 132-a liquid inlet piece, 1321-a liquid inlet channel, 1322-a cavity, 1323-a pressure gauge, 1324-a formation pressure transmission channel, 1325-a bridge channel, 133-a second fixing piece, 134-a second power supply component, 135-a second circuit board, 136-a driving motor, 137-a first limit switch, 138-a second limit switch, 139-a transmission screw, 1391-a first protrusion, 1392-a second protrusion, 1310-a piston, 1311-a sieve plate, 1312-a thrust bearing and 1313-a second cap body,

14-a centering device for centering the drill rod,

15-the first back-off sub,

16-a plug is arranged at the bottom of the pipe,

2-the oil-gas layer is formed,

3-the second releasing sub is connected with the first releasing sub,

4-a pressure gauge for measuring the pressure of the gas,

5-a gas-lift working barrel,

6-the oil-well pump is adopted,

7-oil pipe.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Before further detailed description of the embodiments of the present application, the terms of orientation, such as "upward," "downward," and "outward" in the examples of the present application, are used as references with respect to the orientations shown in fig. 1-4, and are used only for clearly describing the structure of the test string in the examples of the present application, and do not have a meaning of limiting the scope of the present application.

Unless defined otherwise, all technical terms used in the examples of the present application have the same meaning as commonly understood by one of ordinary skill in the art.

In order to make the technical solutions and advantages of the present application clearer, the following will describe the embodiments of the present application in further detail with reference to the accompanying drawings.

With the development of each oil field gradually entering the middle and later stages, in order to increase oil and stabilize yield, a more common technical means at present is water injection development. The influence of the water injection well on each oil and gas layer of the production well is usually obtained through testing under the influence of the geological conditions of multiple layer systems and complex fault block reservoirs of the oil field, so that the layered exploitation dynamics of the oil well is clarified, and data support is provided for adjusting or improving development strategies.

Currently, the tests mainly include a fluid production profile test and a pressure recovery test. The liquid production profile test can obtain the liquid production conditions of each oil-gas layer of the production well, such as liquid production amount, water content and the like; and obtaining the geological condition of the target layer through a pressure recovery test.

In order to overcome the limitations of the above-mentioned testing technology and meet the requirement of testing without stopping production of an oil well, the embodiment of the application provides a testing pipe column, and the structural schematic diagram of the testing pipe column is shown in fig. 1 or fig. 2.

Referring to fig. 1 or 2, the test string comprises: at least two sub-strings 1.

Each sub-string 1 comprises a packer 11, a multi-parameter tester 12 and a switch 13 which are sequentially connected through an oil pipe, and a perforated oil-gas layer 2 is arranged between every two adjacent packers 11. That is, the packers 11 are used to separate each hydrocarbon zone 2 within the well, one sub-string 1 for each perforated hydrocarbon zone 2.

Referring to fig. 3, the multi-parameter tester 12 includes a first housing 121, and a first fixing member 122, a first power supply assembly 123, a first circuit board 124, a pressure sensor 125, a water content sensor 126, a turbine 127, a turbine sensor 128, and a temperature sensor 129 which are located in the first housing 121, and the protection of the respective components located therein is achieved by the first housing 121, and the first housing 121 is located in an oil pipe (not shown in the drawings). It is understood that the first housing 121 is resistant to high pressure and hollow inside.

The first power supply assembly 123, the first circuit board 124, the pressure sensor 125, the temperature sensor 129, the moisture sensor 126, the turbine sensor 128 and the turbine 127 are sequentially fixed on the first fixing member 122, so that the first power supply assembly 123, the first circuit board 124, the pressure sensor 125, the temperature sensor 129, the moisture sensor 126, the turbine sensor 128 and the turbine 127 are fixed by the first fixing member 122.

The first power supply assembly 123 is electrically connected to the first circuit board 124, and the first power supply assembly 123 is used to electrically support the first circuit board 124.

The pressure sensor 125, the temperature sensor 129, the moisture sensor 126, and the turbine sensor 128 are electrically connected to the first circuit board 124 such that pressure data measured by the pressure sensor 125, temperature data measured by the temperature sensor 129, moisture data measured by the moisture sensor 126, and flow data measured by the turbine sensor 128 are all transferable for storage on the first circuit board 124.

One end of the pressure sensor 125 and one end of the temperature sensor 129 are in contact with the external environment through the first housing 121, respectively, so as to measure the pressure and temperature of the fluid flowing out of the hydrocarbon reservoir.

The first housing 121, which is located outside the moisture sensor 126, has a plurality of first through slots 12101, so that after the liquid flowing out of the hydrocarbon reservoir passes through the turbine 127 and the moisture sensor 126, the liquid can leave the inside of the first housing 121 through the first through slots 12101, thereby facilitating the measurement of the pressure and the temperature by the pressure sensor 125 and the temperature sensor 129.

Referring to fig. 4, the switch 13 includes a second housing 131, a liquid inlet 132, a second fixing element 133 located in the second housing 131, a second power supply assembly 134, a second circuit board 135, a driving motor 136, a first limit switch 137, and a driving screw 139, and the second housing 131 is used to protect various components located therein. It is understood that the second housing 131 is resistant to high pressure and hollow inside.

One end of the second housing 131 is positioned in the inlet 132 and connected to the inlet 132, and the second housing 131 is positioned in the oil pipe (not shown in the figure).

The second power supply assembly 134, the second circuit board 135, the driving motor 136 and the driving screw 139 are sequentially fixed on the second fixing member 133, so that the second power supply assembly 134, the second circuit board 135, the driving motor 136 and the driving screw 139 are fixed by using the second fixing member 133.

The first limit switch 137 and the second limit switch 138 are also fixed on the second fixing piece 133 and located outside the transmission lead screw 139, the transmission lead screw 139 is provided with a first protrusion 1391 and a second protrusion 1392, the first protrusion 1391 is used for turning on or off the first limit switch 137, the second protrusion 1392 is used for turning on or off the second limit switch 138, the first limit switch 137 can indicate the driving motor 136 to be powered off through the second circuit board 135 after determining whether the driving motor 136 moves upwards to a certain position so as to protect the driving motor 136, and the second limit switch 138 can indicate the driving motor 136 to be powered off through the second circuit board 135 after determining whether the driving motor 136 moves downwards to a certain position so as to protect the driving motor 136.

It is understood that, referring to fig. 4, the height of the first limit switch 137 in the vertical direction is higher than the height of the second limit switch 138 in the vertical direction, and the first limit switch 137 and the second limit switch 138 are not located on the same side.

The second power supply assembly 134 is electrically connected to the second circuit board 135 and the driving motor 136, respectively, and the second power supply assembly 134 is used to provide electric support for the second circuit board 135 and the driving motor 136.

The driving motor 136, the first limit switch 137 and the second limit switch 138 are electrically connected to the second circuit board 135, so that the second circuit board 135 can control the driving motor 136 to rotate forward or backward; the driving screw 139 is connected to the driving motor 136, and the driving motor 136 can further drive the driving screw 139 to move upwards or downwards; the end of the drive screw 139 remote from the drive motor 136 has a piston 1310 that moves with the drive screw 139 as the drive screw 139 moves.

The liquid inlet 132 has a liquid inlet passage 1321 and a cavity 1322, the piston 1310 is movably located in the cavity 1322 and can control the liquid inlet passage 1321 to communicate with the cavity 1322, the second casing 131 outside the driving screw 139 has a plurality of second through grooves 13101, and the plurality of second through grooves 13101 communicate with the cavity 1322.

Because a sub-tubular column 1 corresponds a hydrocarbon reservoir in the test tubular column that this application embodiment provided, consequently to the theory of operation of an arbitrary sub-tubular column 1 when detecting the hydrocarbon reservoir that corresponds be:

since the drive motor 136 in the switch 13 can be turned on or off under the control of the second circuit board 135, the start time of the drive motor 136 can be set on the second circuit board 135 before running the test string. When the driving motor 136 is started and drives the transmission lead screw 139 to drive the piston 1310 to move downwards, and the first protrusion 1391 on the transmission lead screw 139 is far away from the first limit switch 137, the first limit switch 137 is closed; in the process that the transmission screw 139 moves downwards, when the liquid inlet channel 1321 of the liquid inlet member 132 is communicated with the cavity 1322, liquid in the oil-gas layer corresponding to the sub-pipe column 1 can move upwards through the liquid inlet channel 1321, the cavity 1322 and the second through groove 13101 on the second shell 131, and the oil-gas layer is in a production state; when the second protrusion 1392 of the transmission lead screw 139 contacts the second limit switch 138, the second limit switch 138 is turned on, and the driving motor 136 is powered off, so that the switch is always in a production state. When the driving motor 136 is started and drives the transmission lead screw 139 to drive the piston 1310 to move upwards, the second limit switch 138 is closed; in the process that the transmission screw 139 moves upwards, when the liquid inlet channel 1321 is not communicated with the cavity 1322 any more, the oil-gas layer is in a production stopping state; when the first protrusion 1391 contacts the first limit switch 137, the first limit switch 137 is turned on, the driving motor 136 is powered off, and the oil-gas reservoir is controlled to be in a production stop state.

Since the multi-parameter tester 12 is located in the oil pipe at the upper part of the switch 13 and includes the pressure sensor 125, the moisture sensor 126, the turbine 127 and the turbine sensor 128, and the temperature sensor 129, when the switch 13 is in the open state, the liquid passing through the switch 13 can flow out of the first casing 121 from the first through groove 12101 after passing through the turbine 127 and the moisture sensor 126, the flow rate is measured by the turbine sensor 128, the moisture is measured by the moisture sensor 126, while the liquid flowing out of the first through groove 12101 can continue to move upward in the oil pipe, and the pressure and the temperature of the liquid are measured while passing through the pressure sensor 125 and the temperature sensor 129. The multi-parameter tester 12 can measure parameters such as flow, water content, temperature, pressure and the like of the corresponding hydrocarbon reservoir.

Therefore, when the liquid production profile test needs to be carried out on the preset oil well, the test string provided by the embodiment of the application only needs to ensure that all the switching devices of the well are in the opening state; when pressure recovery testing needs to be carried out on a preset hydrocarbon reservoir, only the switch 13 of the sub-string 1 corresponding to the reservoir needs to be closed, so that the oil well can carry out liquid production profile testing and pressure recovery testing on each hydrocarbon reservoir without stopping production, the production condition of each hydrocarbon reservoir can be truly reflected, and the production development of the oil field is effectively guided.

It will be appreciated that where a plurality of hydrocarbon reservoirs are included in the production well to be tested, in order to ensure that when a non-final hydrocarbon reservoir is closed, the fluid produced in the lower hydrocarbon reservoir can still be lifted to the surface, see figure 5, the inlet 132 of each switch 13 also has a bridge passage 1325 which bridge passage 1325 can provide a lifting passage for closing the lower hydrocarbon reservoir.

In one possible design, the first housing 121 includes a first sub-housing 12102 and a second sub-housing 12103 that are coupled, wherein the first power supply assembly 123, the first circuit board 124, the pressure sensor 125, and the temperature sensor 129 are located in the first sub-housing 12102, and the moisture sensor 126, the turbine 127, and the turbine sensor 128 are located in the second sub-housing 12103.

Optionally, the first sub-housing and the second sub-housing are both of a cylindrical structure.

In one possible design, the first power supply assembly 123 is a battery.

In one possible design, the first circuit board 124 includes a single chip and a control circuit, wherein the control circuit can convert the measured values of temperature, pressure, flow rate and water content into electrical signals and write the electrical signals into a memory for storage.

In one possible design, the pressure sensor 125 uses a sapphire force-sensitive resistor for pressure monitoring.

In one possible design, the temperature sensor 129 employs a contact electrical temperature measurement mode in which a platinum resistor is used as a temperature measurement component for temperature monitoring.

In one possible design, the moisture sensor 126 monitors moisture using capacitive gauge remote and tank circuit frequency discrimination techniques.

In one possible design, the turbine sensor 128 may calculate a flow value from the number of revolutions of the turbine 127.

It will be appreciated that the pressure sensor 125, temperature sensor 129, moisture sensor 126 and turbine sensor 128 are each connected to the first circuit board 124 by leads.

In one possible design, referring to FIG. 3, the multi-parameter tester 12 further includes a connector 1210 and a first connector 1211.

The connector 1210 is located at one end of the first housing 121 close to the turbine 127 and is detachably disposed in the first connector 1211, and the first housing 121 is connected to the first connector 1211 through the connector 1210.

The interior of the connector 1210 and the interior of the first connector 1211 are hollow and communicate with each other, and the produced fluids from the hydrocarbon reservoir can enter the connector 1210 through the first connector 1211 and then up into the first housing 121 through the connector 1210.

In one possible design, referring to fig. 3, the multi-parameter tester 12 also includes a first cap 1212.

The first cap 1212 is located at an end of the first housing 121 away from the turbine 127, and the end of the first housing 121 away from the turbine 127 is sealed by the first cap 1212, so that the first cap 1212 and the first fixing member 122 cooperate together to prevent the first power supply assembly 123 and the first circuit board 124 located inside the first housing 121 from contacting formation fluid and failing to operate normally.

In one possible design, the second housing 131 is a cylindrical structure.

In one possible design, the second power supply assembly 134 includes a first battery and a second battery, wherein the first battery is electrically connected to the drive motor 136 for providing electrical support to the drive motor 136; the second battery is electrically connected to the second circuit board 135 for providing electrical support to the second circuit board 136. So set up, can avoid driving motor 136 to influence the normal work of the singlechip in the second circuit board 136 at the during operation.

In one possible design, the second circuit board 135 includes a single chip and a control circuit for controlling the driving motor 136 and protecting the driving motor 136 from overload, and at the same time protecting the driving motor 136 and a drive screw 139 connected to the driving motor 136 when the first limit switch 137 and the second limit switch 138 are blocked.

It is understood that the second circuit board 135 may control the drive motor 136 to rotate forward or backward, and the drive screw 139 may convert the axial rotation of the drive motor 136 into vertical motion.

In one possible design, referring to fig. 4, the switch 13 further includes a thrust bearing 1312, the thrust bearing 1312 being fixed to the second fixing member 133 and located between the second circuit board 135 and the lead screw 139 for bearing axial load.

In one possible design, the piston 1310 may employ multiple V-rings to provide pressure relief.

In one possible design, referring to fig. 4, the inlet 132 has a perforated plate 1311, the perforated plate 1311 being located at the inlet of the inlet channel 1321 to prevent sand from the well from affecting the test string and blocking the inlet channel 1321 during the run in of the test string.

In a possible design, referring to fig. 4, the liquid inlet member 132 is further provided with a pressure interface 1323 and a formation pressure transmission passage 1324 which are communicated with each other, the formation pressure transmission passage 1324 is communicated with the liquid inlet passage 1321, and the pressure interface 1323 is used for connecting a pressure meter 4.

Optionally, the pressure interface 1323 includes a first pressure interface and a second pressure interface, wherein the first pressure interface is used for connecting a first pressure gauge to monitor the formation pressure; the second pressure gauge is used for connecting the second pressure gauge for backup and reference.

In a possible design, referring to fig. 4, the switch 13 further includes a second cap 1313, the second cap 1313 is located at an end of the second housing 131 away from the liquid inlet 132, and the end of the second housing 131 away from the liquid inlet 132 is sealed by the second cap 1313, so that the second cap 1313 and the second fixing member 133 cooperate together to prevent the second power supply assembly 124, the second circuit board 135, the driving motor 136, the first limit switch 137, and the second limit switch 138 located inside the second housing 31 from contacting the formation liquid and failing to operate normally.

Based on the above structure, in one possible design, referring to fig. 1 or fig. 2, each sub-string 1 may further comprise a centralizer 14, wherein the centralizer 14 is located between the packer 11 and the multi-parameter tester 12 for centralizing the sub-string 1 to protect the packer packing.

In one possible design, referring to fig. 1 or 2, each sub-string 1 may further include a first throwout sub 15 or plug 16, the first throwout sub 15 or plug 16 being connected to the switch 13 by tubing. When the sub-pipe column 1 is not the sub-pipe column positioned at the tail end of the testing pipe column, the sub-pipe column 1 comprises the first releasing joint 15 and does not comprise the plug 16, so that when the testing pipe column is difficult to pull out, the first releasing joint 15 is easily released by a releasing after applying a breaking force larger than the first releasing joint 15, so that sectional salvaging can be realized, and complex overhaul is avoided; when the sub-string 1 is a sub-string at the end of a test string, the sub-string 1 includes a plug 16 and does not include the first thrower sub 15, and since the sub-string 1 is at the end of the test string, there is no need for a thrower to disengage at the time of fishing.

Optionally, the first releasing joint 15 is a releasing and communicating releasing joint, and is used for gradually releasing when the pipe string is pulled up.

In one possible example, referring to fig. 1, the test string provided by the embodiment of the present application further includes a second sub 3, and the second sub 3 is connected to the packer 11 of the uppermost sub string 1 through the tubing. At the moment, the testing pipe column can be released to the underground through the releasing tool, and then the oil pipe 7 connected with the oil well pump 6 is put in, and then the production test is carried out by utilizing the oil well pump 6.

In another possible example, referring to fig. 2, the test string provided by the embodiment of the present application further includes a gas lift mandrel 5, and the lower end of the gas lift mandrel 5 is connected to the packer 11 of the uppermost sub-string 1 through an oil pipe. At the moment, the test pipe column can be matched with a gas lift process for production test.

In summary, the test string provided by the embodiment of the application can enable each section in an oil well to be produced according to design; parameters such as pressure, flow, temperature, water content and the like of each interval can be continuously monitored, and further parameters such as single-interval static pressure, production flow pressure, yield, liquidity, an oil extraction curve, a skin coefficient, effective permeability and the like can be obtained; the pressure recovery of a single interval may be tested after production of the single interval; and when the single-layer section is produced, the oil well pump 6 and the gas lift working condition can be adjusted, and the oil extraction curve of the single-layer section can be tested.

On the other hand, the embodiment of the present application further provides a method for using a test string, which is applied to the test string, and a flowchart of the method is shown in fig. 6, where the method includes:

step 601, a drifting pipe column is put in for drifting.

Wherein, in the drifting process, the drifting tool is ensured to be lowered into a required position; and (5) pulling out the drifting tubular column after the drifting is finished.

And step 602, a scraping pipe column is put in for scraping.

Wherein, the scraping operation is carried out after the scraping pipe column with the scraper is lowered to the required position; completing construction pipe column pressure test according to an operation standard after scraping; and (5) after the scraping is finished, pulling out the scraping pipe column.

Step 603, setting the test pipe column.

The on-off state of each time segment of the on-off device 13 and the sampling intervals of each time segment of the multi-parameter tester 12 and the pressure gauge 4 need to be specifically set.

The specific setting principle is as follows: after the switch 13 in each sub-pipe column 1 is closed, the well is put into the well, and the closing time of each switch 13 is set according to the downhole operation time (which needs to be determined by the construction progress of the downhole operation construction team); after completion, production is carried out after each switch 13 is opened, flushing fluid entering the stratum and fluid in a shaft are discharged, and then each interval is produced in sequence; the state of the switch 13 needs to ensure that the production stability time of each stage meets the pressure recovery test and that sufficient pressure recovery time exists after production; after the test is finished, all the switches 13 need to be in an open state, so that the test of pulling out of the pipe column is facilitated.

Step 604, testing the assembly of the tubular string.

Firstly, sequentially connecting a packer 11, a centralizer 14, a multi-parameter tester 12, a switch 13 and a first releasing joint 15 or a plug 16 by using an oil pipe to complete the assembly of each sub-pipe column 1; and then connecting the plurality of sub-pipe columns 1 pairwise.

Taking fig. 1 as an example, a second releasing sub 3 is connected to the uppermost sub pipe column 1;

taking fig. 2 as an example, the gas lift working cylinder 5 is connected to the uppermost sub-string 1 through an oil pipe.

Step 605, a test string is run in.

Wherein a depth correction is required to ensure that the packer 11 in each sub-string 1 is set in the design position and each packer 11 is set after the position is confirmed.

And step 606, performing production test after completion.

Wherein, can change each layer section oil-well pump or gas lift operating mode, test the oil recovery curve of each layer section.

And step 607, pulling out the test pipe column after the test is finished.

At step 608, test data is obtained.

Wherein, test data are obtained according to the first circuit board 124 and the pressure gauge 4 of the multi-parameter tester 12 in each sub-pipe column 1.

The test data can comprise parameters such as static pressure, well temperature, flow pressure, flow temperature, flow rate, water content and the like of each interval, and further obtain the production pressure difference, the oil extraction curve and the liquid production condition of each interval; and (4) performing well test interpretation on the single-layer pressure recovery data to obtain parameters such as the skin coefficient, the effective permeability and the like.

In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A test string, comprising: at least two sub-tubular columns (1),

each sub-pipe column (1) comprises a packer (11), a multi-parameter tester (12) and a switch (13) which are sequentially connected through an oil pipe, and a perforated oil-gas layer (2) is arranged between every two adjacent packers (11);

the multi-parameter tester (12) comprises a first shell (121), a first fixing piece (122), a first power supply assembly (123), a first circuit board (124), a pressure sensor (125), a water-containing sensor (126), a turbine (127), a turbine sensor (128) and a temperature sensor (129), wherein the first fixing piece (122), the first power supply assembly, the turbine sensor (128) and the temperature sensor are positioned in the first shell (121); the first housing (121) is located within an oil pipe; the first power supply assembly (123), the first circuit board (124), the pressure sensor (125), the temperature sensor (129), the moisture sensor (126), the turbine sensor (128) and the turbine (127) are sequentially fixed on the first fixing member (122), the first power supply assembly (123) is electrically connected with the first circuit board (124), and the pressure sensor (125), the temperature sensor (129), the moisture sensor (126) and the turbine sensor (128) are electrically connected with the first circuit board (124); one end of the pressure sensor (125) and one end of the temperature sensor (129) are respectively in contact with the external environment through the first housing (121); a plurality of first through grooves (12101) are formed on the first housing (121) outside the moisture sensor (126);

the switch (13) comprises a second shell (131), a liquid inlet piece (132), a second fixing piece (133), a second power supply assembly (134), a second circuit board (135), a driving motor (136), a first limit switch (137), a second limit switch (138) and a transmission screw rod (139), wherein the second fixing piece (133), the second power supply assembly (134), the second circuit board (135), the driving motor (136), the first limit switch (137), the second limit switch (138) and the transmission screw rod (139) are positioned in the second shell (131); one end of the second shell (131) is positioned in the liquid inlet part (132) and is connected with the liquid inlet part (132); the second shell (131) is positioned in an oil pipe, and the second power supply assembly (134), the second circuit board (135), the driving motor (136) and the transmission lead screw (139) are sequentially fixed on the second fixing piece (133); the first limit switch (137) and the second limit switch (138) are also fixed on the second fixing piece (133) and are positioned outside the transmission lead screw (139), the transmission lead screw (139) is provided with a first protrusion (1391) and a second protrusion (1392), the first protrusion (1391) is used for opening or closing the first limit switch (137), and the second protrusion (1392) is used for opening or closing the second limit switch (138); the second power supply assembly (134) is electrically connected with the second circuit board (135) and the driving motor (136) respectively, the driving motor (136), the first limit switch (137) and the second limit switch (138) are electrically connected with the second circuit board (135), and the transmission lead screw (139) is connected with the driving motor (136); the end of the transmission screw rod (139) far away from the driving motor (136) is provided with a piston (1310), the liquid inlet piece (132) is provided with a liquid inlet channel (1321) and a cavity (1322), the piston (1310) is movably positioned in the cavity (1322), and the liquid inlet channel (1321) can be controlled to be communicated with the cavity (1322); the second shell (131) on the outer side of the transmission screw rod (139) is provided with a plurality of second through grooves (13101), and the second through grooves (13101) are communicated with the cavity (1322).

2. The test string according to claim 1, wherein the multi-parameter tester (12) further comprises a connector (1210) and a first sub (1211), wherein,

the connecting piece (1210) is positioned at one end of the first shell (121) close to the turbine (127) and is detachably arranged in the first joint (1211);

the inside of the connector (1210) and the inside of the first joint (1211) are hollow and communicate with each other.

3. The test string of claim 1, wherein the multi-parameter tester (12) further comprises a first cap (1212), the first cap (1212) being located at an end of the first housing (121) distal from the worm gear (127).

4. The test column according to claim 1, wherein the inlet (132) is provided with a perforated plate (1311), and the perforated plate (1311) is positioned at an inlet of the inlet channel (1321).

5. The test string as claimed in claim 1, wherein the inlet (132) is further provided with a pressure tap (1323) and a formation pressure transmission passage (1324) which are communicated with each other, the formation pressure transmission passage (1324) is communicated with the inlet (1321), and the pressure tap (1323) is used for connecting a pressure gauge (4).

6. Test string according to claim 1, characterised in that the switch (13) further comprises a thrust bearing (1312), the thrust bearing (1312) being fixed on the second fixture (133) and being located between the second circuit board (135) and the leadscrew (139).

7. The test string according to claim 1, wherein the switch (13) further comprises a second cap (1313), the second cap (1313) being located at an end of the second housing (131) remote from the inlet (132).

8. The test string according to claim 1, wherein each sub-string (1) further comprises a centralizer (14), the centralizer (14) being located between the packer (11) and the multi-parameter tester (12).

9. Test string according to claim 1, characterised in that each sub-string (1) further comprises a first throwout sub (15) or plug (16), the first throwout sub (15) or plug (16) being connected with the switch (13) by means of a tubing.

10. The test string according to claim 1, further comprising a second throwout sub (3), the second throwout sub (3) being connected to a packer (11) of the sub-string (1) by a tubing.