CN113464115B

CN113464115B - A formula of can passing through testing arrangement in pit for water injection well

Info

Publication number: CN113464115B
Application number: CN202110772677.7A
Authority: CN
Inventors: 杜晓霞; 李翔; 季公明; 郭宏峰; 赵广渊; 杨树坤; 史景岩; 檀佰稳; 孙希康
Original assignee: China Oilfield Services Ltd
Current assignee: China Oilfield Services Ltd
Priority date: 2021-07-08
Filing date: 2021-07-08
Publication date: 2022-12-09
Anticipated expiration: 2041-07-08
Also published as: CN113464115A

Abstract

The invention discloses a penetrable underground testing device for a water injection well, which is arranged on a water injection pipe column and is characterized by comprising an upper transition section, a main body, a lower transition section and a cable; the upper transition section and the lower transition section are respectively provided with the upper end and the lower end of the main body; the upper transition section, the main body and the lower transition section are provided with a central channel which is communicated up and down; the main body is provided with a plurality of detectors; a cavity is arranged in the main body, a circuit assembly is arranged in the cavity, the circuit assembly is electrically connected with the plurality of detectors respectively, and the cable extends into the cavity and is connected with the circuit assembly; the through wires hole that extends and communicate the cavity along its length direction is seted up to the main part, and the cable sets up to penetrate the through wires hole at the ladder face, is equipped with the cable fastener in the through wires hole. The invention relates to the field of oil extraction engineering, and provides a traversable underground testing device for a water injection well, which can be lowered into a shaft along with a water injection pipe column to realize real-time monitoring of flow, pressure and temperature of each layer in the well, and is suitable for complex well conditions such as large-displacement water injection and the like.

Description

A formula of can passing through testing arrangement in pit for water injection well

Technical Field

The invention relates to the field of oil extraction engineering, in particular to a traversable underground testing device for a water injection well.

Background

The hydraulic control water injection process is a common underground separate injection technology for offshore oil fields, adopts a hydraulic mode for control, has high reliability for long-term use due to the main adoption of a mechanical control allocation method, is popularized and applied in a water injection well, and achieves good application effect.

The common underground testing method for the mechanical water injection allocation well is to use a cable belt testing instrument to test the flow, and equipment such as a cable winch needs to be matched during testing, so that the well head is occupied, and the problem of low operation efficiency exists. Compared with the conventional separate injection technology, the hydraulic control water injection process has the advantages of being capable of performing allocation at a wellhead, but does not have the function of testing underground water injection data (flow, pressure and temperature), and the water injection condition of each layer cannot be intuitively judged.

Disclosure of Invention

The embodiment of the invention provides a traversable underground testing device for a water injection well, which is arranged on a water injection pipe column and comprises an upper transition section, a main body, a lower transition section and a cable;

the upper transition section and the lower transition section are respectively provided with the upper end and the lower end of the main body, the outer diameters of the upper transition section and the lower transition section are smaller than the outer diameter of the main body, so that step surfaces are formed at the upper end and the lower end of the main body, and the upper transition section and the lower transition section are connected with the water injection pipe column;

the upper transition section, the main body and the lower transition section are provided with a central channel which is communicated up and down and used for fluid to pass through;

a plurality of detectors are provided on the body, the plurality of detectors being arranged to measure a plurality of the following parameters: flow rate in the central passage, fluid pressure in the central passage, pressure of a wellbore in which the body is located, temperature inside and outside the body;

a cavity is arranged in the main body, a circuit assembly is arranged in the cavity, the circuit assembly is electrically connected with the detectors respectively, and the cable extends into the cavity, is connected with the circuit assembly and is used for supplying power and communicating the circuit assembly;

the main part is seted up and is followed its length direction extension and intercommunication the through wires hole of cavity, the cable sets up to the ladder face penetrates the through wires hole, be equipped with the cable fastener in the through wires hole, be used for with the cable locking is in the through wires hole.

One possible design, the cable includes an upper cable which penetrates the upper end of the main body and electrically connects the circuit assembly;

or, the cable includes an upper cable and a lower cable, which are penetrated by the upper end and the lower end of the main body, respectively, and connected to the circuit assembly, respectively.

A possible design, the main part includes top connection, centrum and lower clutch, top connection and lower clutch set up respectively the upper and lower both ends of centrum, and respectively with go up the changeover portion with the changeover portion meets down.

In one possible design, the central body comprises an inner tube and an outer tube, the outer tube is sleeved outside the inner tube, the inner tube and the outer tube are both connected with the upper joint and the lower joint, and the cavity is defined between the outer tube and the inner tube; the detectors comprise flow testing probes, external pressure sensors and internal pressure sensors, the flow testing probes are arranged on the pipe walls of the inner pipes, and the external pressure sensors and the internal pressure sensors are arranged in the cavities.

The utility model provides a possible design, the outer wall of inner tube is equipped with two outstanding annular muscle, two the annular muscle will the cavity separation is for the sensor chamber, circuit chamber and the prefabricated chamber that from top to bottom set gradually, circuit assembly sets up the circuit intracavity, external pressure sensor and internal pressure sensor set up in the sensor chamber.

One possible design, the external pressure sensor with the interior pressure sensor is followed the circumference of main part is arranged, the external pressure sensor with the embedding of interior pressure sensor the top connection, the external pressure sensor with the sense terminal of interior pressure sensor all dorsad the chamber wall in sensor chamber, the top connection is equipped with the sense terminal of intercommunication external pressure sensor and the first runner of center passageway to and the intercommunication the sense terminal of interior pressure sensor and external second runner.

In one possible design, the threading hole comprises a first hole section provided on the upper joint and the lower joint, and a second hole section provided on the annular rib, the first hole section and the second hole section being arranged along a straight line; the cable fastener comprises cable clamping sleeve connectors arranged at two ends of the first hole section and a cable fixing connector arranged in the second hole section, and the cable clamping sleeve connectors and the cable fixing connector are sleeved on the cable and hoop the cable.

According to a possible design, the inner pipe is provided with a first sealing ring at the joint of the upper joint and the lower joint, the outer pipe is provided with a second sealing ring at the joint of the upper joint and the lower joint, and a third sealing ring is arranged between the annular rib and the inner wall of the outer pipe.

According to a possible design, the lower joint is arranged in the outer pipe, the bottom of the outer pipe is provided with a fixing sleeve, and the fixing sleeve is abutted to the lower joint to limit the lower joint.

The circuit assembly comprises a test circuit module and a main control circuit module, wherein the test circuit module and the main control circuit module are respectively connected with the cable, the test circuit module is electrically connected with a plurality of detectors, two sealed electrical component bins are arranged in the circuit cavity, and the test circuit module and the main control circuit module are respectively arranged in the electrical component bins.

In one possible design, the diameter of the central channel is set to 43-50mm.

The outer wall of the main body is provided with a plurality of mounting grooves arranged along the length direction of the main body, at least four hydraulic control pipelines outside the water injection pipe column are arranged in the mounting grooves, and the outer side of the main body is sleeved with a steel pipe hoop to prevent the hydraulic control pipelines from being separated from the mounting grooves.

The underground testing device provided by the embodiment of the invention can be put into a shaft along with a water injection pipe column, realizes real-time monitoring of flow, pressure and temperature of each layer in the underground, and is suitable for complex well conditions such as large-displacement water injection and the like.

The main body of the embodiment of the invention adopts the plurality of sealing rings, and the sealed electric appliance component bin can further protect the circuit components, thereby avoiding the occurrence of the situations of circuit board burnout and the like caused by the sealing failure of the testing device.

The inner diameter of the main body of the embodiment of the invention is 43-50mm, so that the tool can be put into a common underground tool, and most of test requirements can be met.

The plurality of cable fasteners of the embodiment of the invention adopt a clamping sleeve fixing mode, so that the cables can be well fixed, and the power supply failure of the cables caused by the fact that the cables stretch under stress is prevented.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a schematic view of a pass-through downhole testing apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the upper joint of FIG. 1;

FIG. 3 is a second cross-sectional view of the upper joint of FIG. 1;

FIG. 4 is a third schematic cross-sectional view of the upper joint of FIG. 1;

FIG. 5 is a schematic view of the center body of FIG. 1;

FIG. 6 is a schematic view of the connection of the upper fitting to the central body of FIG. 1;

FIG. 7 is a schematic view of the lower joint of FIG. 1;

fig. 8 is a schematic view of the harness of fig. 1;

FIG. 9 is a schematic view of the lower coupling of FIG. 1 coupled to a central body;

FIG. 10 is a first schematic view of the cable penetration of FIG. 1;

FIG. 11 is a second schematic drawing of the cable penetration of FIG. 1;

FIG. 12 is an enlarged view of a portion of FIG. 1 at A;

FIG. 13 is an enlarged view of a portion of FIG. 1 at B;

FIG. 14 is a schematic view of a traversable downhole testing device according to another embodiment of the invention.

Reference numerals: 100-cable, 101-upper cable, 102-lower cable, 103-cable fixed joint, 104-cable ferrule joint, 200-upper transition section, 300-main body, 301-upper joint, 302-lower joint, 303-inner tube, 304-outer tube, 305-cavity, 306-circuit cavity, 307-sensor cavity, 308-prefabricated cavity, 309-electrical component bin, 310-step surface, 311-first hole section, 312-first flow channel, 313-second flow channel, 314-mounting groove, 315-annular rib, 316-second hole section, 317-bin wall, 318-bin cover, 319-line passing channel, 320-fixing sleeve, 321-sealing groove, 400-lower transition section, 500-central channel, 601-internal pressure sensor, 602-external pressure sensor, 603-flow test probe, 700-hydraulic control pipeline, 701-first sealing ring, 702-second sealing ring, 703-third sealing ring, and 800-steel pipe hoop.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

Please refer to fig. 1 to 14 for a downhole testing device according to an embodiment of the present invention. The traversable underground testing device can be arranged on a water injection pipe column and is arranged in a shaft to measure underground data in real time. The downhole testing device comprises an upper transition section 200, a main body 300, a lower transition section 400 and a cable 100, wherein the upper transition section 200 and the lower transition section 400 are respectively installed at the upper end and the lower end of the main body 300, the outer diameters of the upper transition section 200 and the lower transition section 400 are smaller than the outer diameter of the main body 300, stepped surfaces 310 are formed at the upper end and the lower end of the main body 300, and the upper transition section 200 and the lower transition section 400 are used for being connected with a water injection pipe column. The upper transition section 200, the main body 300, and the lower transition section 400 are connected in sequence from top to bottom, and a central passage 500 is formed therethrough for fluid to pass through. Furthermore, the main body 300 is provided with a plurality of detectors for measuring the following parameters: flow rate in the central passage 500, fluid pressure in the central passage 500, pressure in the wellbore in which the body 300 is located. The main body 300 has a cavity 305, and a circuit assembly (not shown) is disposed in the cavity 305, the circuit assembly is electrically connected to the plurality of detectors, and the cable 100 extends into the cavity and is connected to the circuit assembly for supplying power and communicating with the circuit assembly. In addition, the main body 300 is provided with a threading hole extending along the length direction and communicated with the cavity 305, the cable 100 is threaded into the threading hole through the stepped surface 310, and a cable fastener is arranged in the threading hole to lock the cable 100 in the threading hole. Therefore, the underground testing device can be put into the underground along with the water injection pipe column, realizes the real-time monitoring of the flow and the pressure of each layer in the underground, and is suitable for complex well conditions such as large-displacement water injection and the like.

As shown in fig. 1, the upper transition section 200 and the lower transition section 400 are both tubular, the upper end of the upper transition section 200 is provided with an external thread which can be screwed with a water injection pipe column, and the lower end of the upper transition section is also provided with an external thread which can be screwed with the main body 300, thereby ensuring tight connection and sealing. Similarly, the upper and lower ends of the lower transition section 400 are provided with external threads, which can be screwed to the main body 300 and the water injection string, respectively. Therefore, the underground testing device is connected with the water injection pipe column into a whole through the upper transition section 200 and the lower transition section 400, a plurality of underground testing devices are also installed on the water injection pipe column in the same shaft, the plurality of underground testing devices are formed to be connected in series by the water injection pipe column, and the plurality of underground testing devices can measure data such as flow, pressure and the like of different underground layers. The upper transition section 200, the main body 300 and the lower transition section 400 have uniform inner diameters, and the diameter of the central passage 500 is set to be 46mm, so that the central passage can be lowered by a common downhole tool and can meet most of the test requirements, and the diameter of the central passage 500 is not limited thereto, and may be other sizes larger than 42mm, for example.

The cable 100 is connected with a wellhead instrument, can transmit data up and down, can also supply power to downhole equipment, extends downwards along with the extension of the water injection string, can extend into the main body 300 from the upper end of the main body 300 when passing through a downhole testing device, and penetrates out from the lower end of the main body 300 if power supply or data transmission of other instruments below is needed, and continues to extend along the water injection string; if no further power is required to be supplied or data is to be transmitted downwards, the cable 100 only passes into the body 300 from the upper end and no longer passes out from the lower end. For example, when a plurality of downhole testing devices are provided on a water injection string, several downhole testing devices, except the lowermost downhole testing device, need to be powered down and transmitted, as shown in fig. 1, and the cable 100 needs to extend into the body 300 from the upper end thereof and then out from the lower end thereof. Also for example, when there is a single downhole testing device on the injection string, or the downhole testing device is at the lowermost side, as shown in FIG. 14, the cable 100 passes into the body 300 only from the upper end and no longer out from the lower end.

In the case of passing up and down through the main body 300, the cable 100 includes an upper cable 101 and a lower cable 102, the upper cable 101 is positioned at the upper side of the main body 300, the stepped surface 310 at the upper end of the main body 300 penetrates into the main body 300, and is connected to the circuit assembly, and the lower cable 102 connected to the circuit assembly is positioned at the lower side of the main body 300, and passes out of the main body 300 through the stepped surface 310 at the lower end of the main body 300. The circuit assembly comprises a test circuit module (not shown in the figure) and a main control circuit module (not shown in the figure), wherein the test circuit module and the main control circuit module are respectively connected with a cable, and the test circuit module is also electrically connected with each detector, collects data of each detector and uploads the data to a ground data acquisition system through the cable. The plurality of detectors includes a flow rate measuring probe 603 that measures a flow rate, and an external pressure sensor 602 and an internal pressure sensor 601 that measure a pressure.

As shown in fig. 1, the main body 300 includes a detachable upper connector 301, a central body and a lower connector 302, wherein the upper connector 301 and the lower connector 302 are respectively installed at the upper end and the lower end of the central body and respectively connected with the upper transition section 200 and the lower transition section 400. The central body is divided into an inner tube 303 and an outer tube 304, wherein the outer tube 304 is sleeved outside the inner tube 303, the inner tube 303 and the outer tube 304 are both connected with an upper connector 301 and a lower connector 302, a cavity 305 is enclosed between the inner tube 303 and the outer tube 304, and the cavity 304 provides an installation space for the circuit components.

As shown in fig. 2 to 4 and 12, the upper end of the upper joint 301 is provided with an internal thread for connecting with the upper transition section, the external pressure sensor 602 and the internal pressure sensor 601 are embedded in the lower end of the upper joint 301 and arranged along the circumferential direction of the upper joint 301, the detection ends of the external pressure sensor 602 and the internal pressure sensor 601 are arranged to the upper side, and the lower ends of the external pressure sensor 602 and the internal pressure sensor 601 are the leading ends of the wire harnesses. Correspondingly, the lower end of the upper joint 301 is provided with a groove for mounting the external pressure sensor 602 and the internal pressure sensor 601, and is further provided with a first flow channel 312 and a second flow channel 313, wherein the first flow channel 312 is L-shaped and is communicated with the central channel 500 (i.e. the detection end of the internal pressure sensor 601 is communicated with the central channel 500), so that the internal pressure sensor 601 can measure the fluid pressure of the central channel 500; the second flow channel 313 is a straight line extending from a groove to the stepped surface 310, and the groove is connected to the outside (i.e., the detection end of the external pressure sensor 602 is connected to the outside), so that the external pressure sensor 602 can measure the pressure in the wellbore. The upper connector 301 is provided with a first hole 311 penetrating vertically, and the first hole 311 has a diameter larger than the diameter of the cable 100 and allows the cable 100 to penetrate therethrough.

As shown in fig. 5, 6 and 13, the outer wall of the inner tube 303 is provided with two protruding annular ribs 315, the annular ribs 315 and the inner tube 303 are formed by one-step processing, the annular ribs 315 surround the circumference of the inner tube 303, the two annular ribs 315 are arranged at intervals, the annular ribs 315 abut against the inner wall of the outer tube 304 to support the cavity 305, the cavity 305 is divided into a sensor cavity 307, a circuit cavity 306 and a prefabricated cavity 308 which are sequentially arranged from top to bottom by the two annular ribs 315, the circuit component is arranged in the circuit cavity 306, and the external pressure sensor 602 and the internal pressure sensor 601 are arranged in the sensor cavity 307. A third sealing ring 703 is arranged between the annular rib 315 and the inner wall of the outer tube 304. To do in order toThe circuit assembly is electrically connected with the external pressure sensor 602 and the internal pressure sensor 601, the annular rib 315 is provided with a wire passage 319, and lead wires of the external pressure sensor 602 and the internal pressure sensor 601 can be led into the circuit cavity 306. The pipe wall of the inner pipe 303 is provided with a plurality of flow test probes 603, the detection end of each flow test probe 603 is positioned on one side of the inner pipe 303, and the flow test probes 603 can test the induced voltage when the flow changes correspondingly. According to Faraday's law of electromagnetic induction, when the conductor cuts magnetic lines of force, a voltage proportional to the moving speed can be induced on the conductor, and the volume flow of the fluid can be deduced according to the law:

wherein Q is the flow rate, B is the magnetic field intensity; ue is the induced voltage; d is the inner diameter of the central channel. Two sealed electrical component bins 309 are arranged in the circuit cavity 306, and the test circuit module and the main control circuit module are respectively arranged in the two electrical component bins. Specifically, the electrical component bin 309 includes an annular bin wall 317 and a bin cover 318, the bin wall 317 is detachably mounted on the outer wall of the inner tube 303 and is provided with an opening on the side opposite to the inner tube 303, the opening can be covered by the bin cover 318, the bin cover 318 seals the bin wall 317 to perform a sealing process so as to prevent the internal circuit from being damaged, and the bin wall 317 is provided with a through hole for accommodating a wire harness to penetrate. The flow rate test probe 603 is disposed corresponding to the electrical component chamber 309, and a wire harness of the flow rate test probe 603 is directly connected to the electrical component chamber 309. In addition, the two annular ribs 315 are provided with a second hole section 316 which is through from top to bottom, the second hole section 316 corresponds to the first hole section 311, and the first hole section 311 and the second hole section 316 are arranged along a straight line.

As shown in fig. 7, the lower end of the lower connector 302 is provided with an internal thread for connecting with the lower transition section, the lower connector 302 is provided with a first hole section 311 which is through from top to bottom, the aperture of the first hole section 311 is larger than the diameter of the cable 100, and the cable 100 is allowed to pass through.

As shown in fig. 6, 10 and 12, the inner pipe 303 is inserted into the upper joint 301, the lower end of the upper joint 301 is inserted into the outer pipe 304, the inner pipe 303 is provided with a first sealing ring 701 at the joint with the upper joint 301, the outer pipe 304 is provided with a second sealing ring 702 at the joint with the upper joint 301, and the upper joint 301 and the center body are connected and sealed. The first seal 701, the second seal 702, and the third seal 703 are all O-rings. After the connection is completed, the lower end face of the upper joint 301 is spaced from the upper annular rib 315, a sensor cavity 307 is formed between the lower end face and the upper annular rib, and the detection ends of the external pressure sensor 602 and the internal pressure sensor 601 both face away from the cavity wall of the sensor cavity 307. The threading hole that above-mentioned first hole section 311 and second hole section 316 constitute, cable cutting ferrule joint 104 is installed at first hole section 311 both ends, this cable cutting ferrule joint 104 can overlap on last cable 101, but manual operation chucking cable 101, install cable fixed joint 103 in the second hole section, this cable fixed joint 103 can overlap on last cable 101, also manual operation chucking cable 101, cable cutting ferrule joint 104 and cable fixed joint 103 all are the cable fastening spare, above-mentioned sensor cavity 307 also provides installation space for cable cutting ferrule joint 104. Therefore, the two cable ferrule connectors 104 and the cable fixing connector 103 are used for jointly hooping the upper cable 101 to form a ferrule fixing mode, so that the cable 100 can be fixed well, and power supply failure caused by the fact that the cable 100 stretches due to stress in a well is prevented.

As shown in fig. 8, 9 and 11, the central body requires a retainer 320 to be connected to the lower connector 302. The retainer 320 is circular and has an external thread at its upper end for screwing with the lower end of the outer tube 304. The lower joint 302 is disposed inside the outer tube 304 and the inner tube 303 is inserted into the upper end of the lower joint 302, while the upper end of the fixing sleeve 320 abuts against the lower end of the lower joint 302 to connect the central body and the lower joint. Furthermore, the inner tube 303 is provided with a first sealing ring 701 at the connection with the lower joint 302, the outer surface of the fixing sleeve 320 is provided with a sealing groove 321, and a second sealing ring 702 is arranged in the sealing groove to form a seal between the lower joint 302 and the central body. After the connection is completed, the upper end face of the lower connector 302 is spaced from the annular rib 315, a prefabricated cavity 308 is formed between the upper end face and the annular rib 315, the cable ferrule connector 104 is installed at two ends of the first hole section 311, the cable ferrule connector 104 can be sleeved on the lower cable 102 and can be manually operated to clamp the lower cable 102, the cable fixing connector 103 is installed in the second hole section and can be sleeved on the lower cable 102 and can also be manually operated to clamp the lower cable 102, and the prefabricated cavity 308 also provides an installation space for the cable ferrule connector 104. Therefore, the lower cable 102 is clamped by the two cable ferrule connectors 104 and the cable fixing connector 103 together to form a ferrule fixing mode, so that the cable 100 can be fixed well, and power supply failure caused by the fact that the cable 100 stretches due to stress in a downhole is prevented.

As shown in fig. 4, the outer wall of the main body (i.e., the outer wall of the upper joint and the outer pipe) is provided with two mounting grooves 314 arranged along the length direction thereof, at least four hydraulic control pipelines 700 are required to be associated with the outer side of the water injection string, and the four hydraulic control pipelines 700 are reasonably distributed in the mounting grooves 314 according to the position relationship and extend along the length direction of the downhole testing device to form a penetrating through downhole testing device. In addition, the outer side of the main body is sleeved with a steel pipe clamp 800, the outer diameter of the steel pipe clamp 800 is consistent with the outer diameter of the main body, an annular groove is correspondingly formed on the main body to install the steel pipe clamp 800, the steel pipe clamp 800 can be clamped at the groove and limit the hydraulic control pipeline 700, so that the hydraulic control pipeline 700 is prevented from falling out of the installation groove 314.

In some exemplary embodiments, the pipe walls of the inner pipe and the outer pipe are further provided with temperature sensors (not shown in the figures), the temperature sensors are electrically connected with the test circuit module, the temperature sensors can measure the temperature inside and outside the main body in real time and transmit data to the test circuit module, and the test circuit module uploads the data to the ground data acquisition system.

When the underground testing device is installed, a packer, the underground testing device and a water distributor which are connected in sequence can be used as an installation module, cables penetrate through the three components directly, joints are not arranged in the middle of the three components, 200mm is reserved at the upper end of the packer and the lower end of the water distributor after penetrating directly, and the cables among a plurality of installation modules need to be connected through the joints; the cable of the whole underground pipe column is directly penetrated, the cable and the hydraulic control pipeline are penetrated under the side, and the middle part is not connected with two sections of cables by using a joint. Taking the installation process of a single downhole testing device as an example, the upper cable 101 firstly passes through the first hole section 311 of the upper joint 301, the length which can pass through the packer is reserved at the upper end of the upper cable 101, 200mm is reserved at the lower end of the upper cable 101, after the upper cable 101 is preset, the two cable ferrule joints 104 are sequentially connected and fixed, and then the upper cable 101 passes through the second hole section 316. And then, fixing the lower cable 102 in the same way, reserving 200mm at the upper end of the lower cable 102, and reserving 500-1000mm at the lower end of the lower cable or allowing the lower cable to pass through the length of the water distributor. Then, an external pressure sensor 602 and an internal pressure sensor 601 are mounted and fixed to the upper connector 301, and lead wires are connected to the circuit assembly through a wire passage. Then, the flow rate test probe 603 is fixedly connected to the inner tube 303 through threads and an O-ring, the bin wall is fixed to the inner tube 303 through screws, the circuit assembly with the wiring completed is placed in the bin wall, sealing glue treatment is performed, and the bin cover is fixed. The upper joint 301, the inner tube 303 and the lower joint 302 are connected in sequence by means of O-rings, kept coaxial according to the central passage position, and then two cable fixing joints 315 are installed. The outer tube 304 is in threaded connection with the lower end of the upper joint 301, the fixing sleeve 800 is in threaded connection with the lower end of the outer tube 304, the fixing sleeve 800 is fixed on the lower joint 302 and the central body, the upper transition section 200 is connected with the upper joint 301 through threads, and the lower transition section 400 is connected with the lower joint 302 through threads. The hydraulic control pipeline 700 is placed in the mounting groove 314 of the main body, and the hydraulic control pipeline 700 is fixed by the steel pipe clamp 800, so that the hydraulic control pipeline 700 passes through. And finally, connecting a water injection pipe column, wherein the upper transition section 200 and the lower transition section 400 are respectively connected with the water injection pipe column, putting the underground testing device and the water injection pipe column into the well together, communicating and supplying power to the underground testing device through the cable 100, and the cable 100 penetrates out of the well mouth to be connected to a ground data acquisition system so as to display data such as flow, pressure, temperature and the like of each underground layer in real time.

In some exemplary embodiments, as shown in fig. 14, the cable includes only the upper cable, which is threaded through the upper end of the body and electrically connected to the circuit assembly, without threading the cable 100 through the lower side of the body, i.e., without providing a first hole section in the lower fitting 302 and without providing a second hole section in the annular rib 315 on the lower side.

By combining the embodiment, the underground testing device provided by the embodiment of the invention can be put into a shaft along with a water injection pipe column, realizes real-time monitoring of flow, pressure and temperature of each layer in the underground, and is suitable for complex well conditions such as large-displacement water injection and the like. The main body of the embodiment of the invention adopts a plurality of sealing rings, and the sealed electric appliance component bin can further protect the circuit component, thereby avoiding the occurrence of the conditions of circuit board burnout and the like caused by the sealing failure of the testing device. The inner diameter of the main body of the embodiment of the invention is 43-50mm, so that the tool can be put into a common underground tool, and most of test requirements can be met. The plurality of cable fasteners of the embodiment of the invention adopt a clamping sleeve fixing mode, so that the cables can be well fixed, and the power supply failure of the cables caused by the fact that the cables stretch under stress is prevented.

In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "periphery", "mouth" structure ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the structures referred to have specific orientations, are configured and operated in specific orientations, and thus, are not to be construed as limiting the present invention.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," and "assembled" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may refer to a direct connection, an indirect connection through intervening media, and a connection between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A traversable underground testing device for a water injection well is arranged on a water injection pipe column and is characterized by comprising an upper transition section, a main body, a lower transition section and a cable;

a cavity is arranged in the main body, a circuit assembly is arranged in the cavity and is electrically connected with the detectors respectively, and the cable extends into the cavity and is connected with the circuit assembly and used for supplying power and communicating for the circuit assembly;

the main body is provided with a threading hole which extends along the length direction of the main body and is communicated with the cavity, the cable is arranged to penetrate into the threading hole on the step surface, and a cable fastener is arranged in the threading hole and used for locking the cable in the threading hole;

the central body comprises an inner tube and an outer tube, the outer tube is sleeved outside the inner tube, and the inner tube and the outer tube are connected with the upper joint and the lower joint;

the cavity is defined between the outer pipe and the inner pipe; the plurality of detectors comprise flow test probes, external pressure sensors and internal pressure sensors, the flow test probes are arranged on the pipe wall of the inner pipe, and the external pressure sensors and the internal pressure sensors are arranged in the cavities; the outer wall of the inner pipe is provided with two protruding annular ribs, the two annular ribs divide the cavity into a sensor cavity, a circuit cavity and a prefabricated cavity which are sequentially arranged from top to bottom, the circuit assembly is arranged in the circuit cavity, and the external pressure sensor and the internal pressure sensor are arranged in the sensor cavity; two sealed electrical component bins are arranged in the circuit cavity, and the test circuit module and the main control circuit module are respectively arranged in the two electrical component bins;

the threading hole comprises a first hole section and a second hole section, the first hole section is arranged on the upper joint and the lower joint, the second hole section is arranged on the annular rib, and the first hole section and the second hole section are arranged along a straight line; the cable fastener comprises cable ferrule joints arranged at two ends of the first hole section and a cable fixing joint arranged in the second hole section, and the cable ferrule joints and the cable fixing joint are sleeved on the cable and hoop the cable;

the lower joint is arranged in the outer pipe, a fixed sleeve is arranged at the bottom of the outer pipe, and the fixed sleeve abuts against the lower joint to limit the lower joint;

the centrum sets up fixed cover with the lower clutch is connected, fixed cover is ring shape, fixed cover upper end is equipped with the external screw thread, can with outer tube lower extreme spiro union, the lower clutch sets up in the outer tube, the inner tube inserts the upper end of lower clutch, the upper end of fixed cover with the lower extreme of lower clutch offsets, in order to connect the centrum with the lower clutch.

2. The traversable downhole testing device for a water injection well of claim 1, wherein the cable comprises an upper cable threaded by the upper end of the body and electrically connected to the circuit assembly;

3. The traversable downhole testing device for a water injection well of claim 2, wherein the upper and lower joints meet the upper and lower transition sections, respectively.

4. The traversable downhole testing device for water injection wells of claim 1, wherein the external pressure sensor and the internal pressure sensor are arranged along the circumference of the main body, the external pressure sensor and the internal pressure sensor are embedded in the upper joint, the detection ends of the external pressure sensor and the internal pressure sensor both face away from the cavity wall of the sensor cavity, and the upper joint is provided with a first flow passage for communicating the detection end of the external pressure sensor with the central passage and a second flow passage for communicating the detection end of the internal pressure sensor with the outside.

5. The traversable downhole testing device for water injection wells of claim 1, wherein the inner tube is provided with a first sealing ring at the connection with the upper joint and the lower joint, the outer tube is provided with a second sealing ring at the connection with the upper joint and the lower joint, and a third sealing ring is provided between the annular rib and the inner wall of the outer tube.

6. The traversable downhole testing device of claim 5, wherein the outer surface of the retaining sleeve is provided with a sealing groove, and the second sealing ring is disposed in the sealing groove to form a seal between the lower joint and the central body.

7. The traversable downhole testing device for water injection wells of claim 1, wherein the circuit assembly comprises a testing circuit module and a main control circuit module, the testing circuit module and the main control circuit module are respectively connected with the cable, the testing circuit module is configured to be electrically connected with the plurality of detectors, two sealed electrical component bins are arranged in the circuit cavity, and the testing circuit module and the main control circuit module are respectively arranged in the two electrical component bins.

8. The traversable downhole testing device for a water injection well according to any of claims 1 to 7, wherein the diameter of the central channel is set to 43-50mm.

9. The traversable downhole testing device for a water injection well according to any one of claims 1 to 7, wherein the outer wall of the main body is provided with a plurality of mounting grooves arranged along the length direction thereof, at least four hydraulic control lines outside the water injection string are disposed in the mounting grooves, and a steel pipe collar is sleeved outside the main body to prevent the hydraulic control lines from being separated from the mounting grooves.