CN206299374U - A kind of reception device suitable for the underground wireless short pass of nearly drill bit - Google Patents

Abstract

The utility model principally falls into the wireless short pass engineering device technique field of nearly drill bit, and in particular to a kind of reception device suitable for the underground wireless short pass of nearly drill bit.The reception device includes electrical isolation drill collar and the short cylinder of interior electrical isolation, and the centre of the electrical isolation drill collar and the short cylinder of interior electrical isolation is serially connected with insulating short section to realize electrical isolation；Electrical connection is realized by lantern centralizer between the electrical isolation drill collar and the short cylinder of interior electrical isolation；The reception device is also included for realizing the wireless short pass receiving unit that the short pass of downhole wireless signal is received.The electrical isolation drill collar of reception device described in the utility model is respectively provided with electrical isolation function with the short cylinder of interior electrical isolation；Electrical isolation drill collar is non-dismountable with insulating short section in the short cylinder of interior electrical isolation, disclosure satisfy that underground high torque and high-pressure tightness requirement；Simultaneously lantern centralizer electric connection structure not under the influence of seat keyed mwd system salvaged characteristic.

Description

A receiving device suitable for downhole near-drill wireless short transmission

technical field

The utility model mainly belongs to the technical field of near-drill wireless short-transmission devices, and in particular relates to a receiving device suitable for downhole near-drill wireless short-transmission devices.

Background technique

In recent years, the use of horizontal wells to improve oil and gas reservoirs has been widely used in various oil fields. The near-bit geosteering drilling system has the characteristics of real-time judgment of formation properties, advance exploration of formations to be drilled, and accurate steering. It helps to improve the discovery rate of exploratory wells, The drilling rate of development wells and the recovery rate of oil and gas fields.

Near-bit inclination measurement instrument, usually the near-bit inclination sensor is packaged on the front end of the deflection tool (downhole mud motor), and transmitted to the deflection tool (downhole mud motor) by wired or wireless transmission (ultrasonic, electromagnetic waves, etc.) ) in the conventional wireless measurement-while-drilling instrument (LWD/MWD) on the upper part, together with the data measured by the conventional wireless measurement-while-drilling instrument, are transmitted to the ground through wireless transmission methods such as hydraulic pulses or electromagnetic waves.

The real-time acquisition of near-bit well inclination parameters and gamma ray measurements will help field drilling engineers to grasp the drill bit trajectory and geological parameters during drilling, thereby improving oil drilling and recovery. How to transmit near-bit measurement parameters to the ground has become the key to restrict the development of this technology.

At present, the transmission of the measured parameters near the drill bit in domestic research is mostly carried out by means of buried screw cables, acoustic wave wireless transmission, and coil electromagnetic wave wireless transmission.

The screw buried cable belongs to the wired transmission structure: using the wired transmission method, the formation information near the drill bit measured by the sensor in the measuring sub is transmitted to the MWD system through the "cable", and the connection between the near-drill measuring sub and the receiving sub is established. Cable channel. However, these "cables" should be "buried" on every mechanical part between the measuring sub and the MWD system to establish a wired channel, that is, the cables need to be embedded in downhole drilling tools such as the measuring sub, receiving sub, and screw rod. A special screw is required for signal transmission, and at the same time, it needs to solve the problems of high-pressure sealing and reliable electrical connection at the threaded joint position, and the applicability is low.

Compared with the wired transmission method, the wireless transmission method does not need to make major changes to the structure of the downhole drilling tool when using the wireless transmission method, so the overall cost is low and the versatility is good, and it can be used for downhole small data transmission; but In the existing wireless transmission technology, there are also the following disadvantages:

Coil type electromagnetic wave wireless transmission: Electromagnetic wave transmission adopts electromagnetic wave transmitting and receiving devices, that is, the coils are respectively wound on the transmitting and receiving ends of the drill collar, and then covered with insulating materials for protection, forming a wireless transmission device. This transmission method has high requirements on formation resistivity, and cannot meet the requirements of the screw transmission distance (about 10 meters). In addition, since the signal is received by the coil on the outer wall of the drill collar, when the signal is transmitted to the ground through the MWD, it is necessary to solve the problem of data communication between the MWD in the water eye and the receiving coil on the outer wall of the drill collar; that is, a special structure is designed for data connection, which makes the MWD system unsalvageable.

Acoustic wireless transmission: The acoustic wave wireless transmission method uses transmitting and receiving transducers installed on the drill collar transmitting and receiving sub-sections respectively, and transmits signals through the acoustic characteristics of the transmitting and receiving transducers. However, the design of the transducer makes the mechanical structure of the near-bit launch sub more complicated, and at the same time increases the length of the near-bit launch sub. In addition, the sound wave transmission also cannot meet the requirements of the screw transmission distance (about 10 meters). Since the acoustic wave receiving device adopts the outer wall to install the receiving transducer for signal reception, it also needs to solve the communication problem between the outer wall structure transducer and the MWD in the water eye, which makes the MWD system unsalvageable.

Utility model content

In view of the above problems, the utility model provides a receiving device suitable for downhole near-drill wireless short transmission. The insulating short joints in the isolation short barrel are not removable, which can meet the requirements of high torque and high pressure tightness downhole; at the same time, the structure of the receiving unit of the probe structure and the electrical connection structure of the lantern centralizer do not affect the salvage characteristics of the lower seat key MWD system .

The utility model is achieved through the following technical solutions:

A receiving device suitable for downhole near-drill wireless short transmission, the receiving device includes an electrical isolation drill collar and an inner electrical isolation short tube, and an insulating short tube is connected in series between the electrical isolation drill collar and the inner electrical isolation short tube The short section separates the receiving device to form an electrically isolated receiving positive pole and a receiving negative pole; the end close to the MWD system is the receiving positive pole, and the end close to the screw is the receiving negative pole.

The receiving device also includes a wireless short transmission receiving unit for realizing downhole wireless signal short transmission reception;

The receiving device realizes downhole wireless short transmission reception of signals through the receiving positive electrode, the receiving negative electrode and the wireless short transmission receiving unit of the receiving device.

Further, the electrical isolation drill collar includes a MWD connection drill collar, a drill collar insulation pup joint, and a screw connection drill collar; wherein, the MWD connection outer collar is connected to the drill collar equipped with MWD, and the screw connection outer collar is connected to the screw rod ; MWD connection drill collar and screw connection drill collar are made of non-magnetic steel material, drill collar insulation nipple is made of insulating material, both ends of the drill collar insulation nipple are respectively connected to MWD drill collar and screw rod through non-detachable threads Connect drill collar connections for electrical isolation.

Further, the inner electrical isolation short cylinder includes an upper joint, an inner cylinder insulating short joint and a lower joint; wherein, the upper joint and the lower joint are made of metal materials, and the inner cylinder insulating joint is made of insulating material Both ends of the inner cylinder insulating nipple are respectively connected to the upper joint and the lower joint through non-detachable threads.

Further, the wireless short transmission receiving unit includes a sequentially connected MWD adapter cylinder, a second pressure-resistant outer cylinder, an adapter cylinder, a first terminal screw, a first electrical connecting wire, a short section of a receiving circuit, an electrical connector, Second connection wire, second connection screw, metal lantern centralizer;

Wherein, one end of the short section of the receiving circuit is connected to the adapter barrel through the first connecting wire and the first terminal screw that pass through the second rubber shock absorber, and the adapter barrel is connected to the MWD adapter barrel through the second pressure-resistant outer barrel; The other end of the short section of the receiving circuit is connected to the centralizer of the metal lantern through the electrical connector, the second connecting wire and the second terminal screw that penetrate the interior of the inner electrical isolation short barrel;

Further, the upper suspension device of the upper suspension type MWD system or the lower seat key device of the lower seat key type MWD system are connected with the MWD through the MWD outer cylinder and the MWD adapter tube of the receiving device and the MWD connecting drill collar; The tool is electrically connected to the screw connection drill collar through the expanded metal wings. Among them, the upper suspension device of the upper suspension type MWD system or the lower seat key device of the lower seat key type MWD system can be replaced by a serially connected metal lantern centralizer structure.

The second pressure-resistant outer cylinder is electrically connected to the MWD outer cylinder through the MWD adapter tube, and then the second pressure-resistant outer cylinder passes through the upper suspension device or the lower seat key type MWD of the upper suspension MWD system provided with the MWD outer cylinder. The lower seat key device of the system is electrically connected to the MWD connecting drill collar, and metal structural parts are arranged between the MWD outer cylinder and the MWD connecting drill collar to ensure that the MWD system is installed inside the drill collar, and to achieve MWD while realizing structural installation. Electrical connection between outer barrel and MWD connection drill collar.

The first anti-pressure outer cylinder and the metal lantern centralizer are electrically isolated through the inner electrical isolation short cylinder;

The outer collar of MWD connection and the outer collar of screw connection realize electrical isolation through the outer collar insulation nipple.

Further, one end of the inner electrical isolation short cylinder is connected to the first pressure-resistant outer cylinder through a thread and a sealing ring, and the other end of the inner electrical isolation short cylinder is connected to the metal lantern centralizer through a thread and a sealing ring;

Further, the MWD adapter barrel is electrically connected to the MWD outer barrel, and the other end inside the MWD adapter barrel is connected to the battery pup through the first rubber shock absorber; one end inside the adapter barrel is connected through a guide hole and a vibration damping gasket The soft connection is realized with the battery short section, and the other end inside the adapter barrel is connected to the receiving circuit short section through the second rubber shock absorber; the power line of the battery short section passes through the shock absorbing gasket, the adapter barrel, the second The rubber shock absorber provides power for the short section of the receiving circuit and the entire receiving device.

One end of the MWD adapter barrel realizes data communication with the MWD through an electrical connector, and the receiving circuit nipple transmits the data received by the receiving device to the MWD system, and the data is transmitted to the ground through the MWD system.

Further, the outside of the MWD adapter cylinder is connected to the second pressure-resistant outer cylinder through threads and a sealing ring, and the second pressure-resistant outer cylinder is connected to one end of the outside of the adapter cylinder through threads and a sealing ring. The other end of the socket outside is connected with the first pressure-resistant outer cylinder through a thread and a sealing ring.

Further, the receiving device adopts a probe-type structure that facilitates communication with the MWD.

Beneficial technical effects of the utility model:

(1) This utility model proposes a receiving device suitable for wireless short transmission near the drill bit. The receiving device adopts the receiving mode of the drill collar and the inner cylinder double insulation nipple, that is, the electrical isolation of the receiving device is between the drill collar and the The middle of the inner electrical isolation short tube is connected with the insulating pup joint. Based on the above design, the electrical isolation drill collar of the receiving device and the inner electrical isolation short tube both have the function of electrical isolation.

(2) The electrical isolation drill collar and the insulating short joint in the inner electrical isolation short tube are not disassembled, which can meet the requirements of high torque and high pressure tightness downhole;

(3) One end of the receiving device described in the utility model is electrically connected to the MWD connection drill collar through the upper suspension device of the upper suspension type MWD system or the lower seat key device of the lower seat key type MWD system, and the other end of the receiving device is passed through The metal wings opened by the metal lantern centralizer are electrically connected to the drill collar connected by the screw rod, which reduces the requirement for the accuracy of the diameter of the inner water hole of the drill collar, and at the same time realizes a reliable electrical connection; at the same time, the electrical connection structure of the lantern centralizer does not affect the key type of the lower seat. Salvage characteristics of MWD systems.

Description of drawings

Fig. 1 is a structural schematic diagram of a receiving device suitable for downhole near-drill wireless short transmission described in the utility model;

Fig. 2 is a schematic structural diagram of the wireless short transmission receiving unit in a receiving device suitable for downhole near-drill wireless short transmission according to the utility model;

Reference signs: 1. MWD adapter tube, 2-1. the first rubber shock absorber, 2-2. the second rubber shock absorber 3. battery nipple, 4-1. the first pressure-resistant outer cylinder, 4 -2. The second anti-pressure outer cylinder, 5. Adapter cylinder, 6. Receiving circuit pup joint, 7. Electrical isolation drill collar, 8. Metal lantern centralizer, 9-1. The first terminal screw, 9-2. Second connection screw 10. Inner electrical isolation stub, 11. MWD connection drill collar, 12. Drill collar insulation nipple, 13. Screw connection drill collar, 14. First electrical connection wire, 15. Connector, 16. No. Two electrical connecting wires, 17. Upper connector, 18. Inner tube insulation nipple, 19. Lower connector.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

On the contrary, the utility model covers any alternatives, modifications, equivalent methods and schemes made on the spirit and scope of the utility model defined by the claims. Further, in order to make the public have a better understanding of the utility model, some specific details are described in detail in the detailed description of the utility model below. Those skilled in the art can fully understand the present invention without the description of these detailed parts.

Example 1

A receiving device suitable for downhole near-drill wireless short transmission, as shown in Fig. The middle of the barrel 10 is connected in series with an insulating nipple to achieve electrical isolation; the insulating nipple separates the receiving device to form an electrically isolated receiving positive pole and a receiving negative pole; the end close to the MWD system is the receiving positive pole, and the end close to the screw rod To receive the negative pole. The electrical isolation drill collar 7 is electrically connected to the inner electrical isolation short cylinder 10 .

The receiving device also includes a wireless short transmission receiving unit for realizing downhole wireless signal short transmission reception;

The receiving device realizes the downhole wireless short transmission reception of the signal through the receiving positive pole, the receiving negative pole and the wireless short transmission receiving unit of the receiving device; The transmitting device of transmission is used together to realize the wireless short transmission of the measured parameters near the drill bit; wherein the transmitting device of wireless short transmission near the drill bit is used to send out electromagnetic signals. The drill collar 13 returns to the data transmitting unit of the wireless short transmission device near the drill bit, and a part of it passes through the MWD to connect the drill collar 11 to the wireless short transmission receiving unit, and then connects the drill collar 13 to return to the data transmitting unit of the near drill bit wireless short transmission device. , the data received by the wireless short transmission receiving unit is transmitted to the ground through the MWD system. The transmitting device for near-drill wireless short transmission may be a conventional electromagnetic signal transmitting device in the field.

As shown in Figure 2, the electrical isolation drill collar 7 includes a MWD connection drill collar 11, a drill collar insulation pup joint 12, and a screw connection drill collar 13, wherein the MWD connection drill collar 11 is connected to the drill collar with MWD through the API thread connection, the screw connection drill collar 13 is connected to the screw through API thread; the MWD connection drill collar 11 and the screw connection drill collar 13 are made of non-magnetic steel material, the drill collar insulation pup joint 12 is made of insulating material, and the drill collar insulation Both ends of the short joint 12 are respectively connected to the MWD connecting drill collar 11 and the screw connecting drill collar 13 through non-detachable threads to realize electrical isolation. Therefore, the drill collar insulation short joint 12 meets the high torque and high pressure sealing requirements of downhole work.

The inner electrical isolation short cylinder 10 includes an upper joint 17, an inner cylinder insulating joint 18 and a lower joint 19; wherein, the upper joint 17 and the lower joint 19 are made of metal materials, and the inner cylinder insulating joint 18 is made of insulating material. Both ends of the inner cylinder insulating nipple 18 are respectively connected to the upper joint 17 and the lower joint 19 through non-detachable threads. The inner cylinder insulating nipple 18 also meets the downhole high-pressure sealing performance. and strength requirements.

The wireless short transmission receiving unit includes an MWD adapter tube 1, a second pressure-resistant outer tube 4-2, an adapter tube 5, a first terminal screw 9-1, a first electrical connection line 14, and a receiving circuit short circuit connected in sequence. Section 6, electrical connector 15, second connection wire 16, second terminal screw 9-2, metal lantern centralizer 8;

Wherein, one end of the short joint 6 of the receiving circuit is connected to the adapter barrel 5 through the first connecting wire 14 and the first terminal screw 9-1 passing through the second rubber shock absorber 2-2, and the adapter barrel 5 is connected to the adapter barrel 5 through the second anti-corrosion The pressure outer cylinder 4-2 is connected with the MWD adapter cylinder 1; the other end of the receiving circuit short joint 6 passes through the electrical connector 15, the second connecting wire 16 and the second terminal screw 9 that penetrate the interior of the inner electrical isolation short cylinder 10 -2 is connected with metal lantern centralizer 8.

The upper suspension device of the upper suspension MWD system or the lower seat key device of the lower seat key MWD system are connected to the MWD through the MWD outer cylinder, the MWD adapter cylinder 1 of the receiving device and the MWD connecting drill collar 11; the metal lantern centralizer 8 is electrically connected with the screw rod connecting drill collar 13 through the opened metal wings.

The second pressure-resistant outer cylinder 4-2 is electrically connected to the MWD outer cylinder through the MWD adapter cylinder 1, and then the second pressure-resistant outer cylinder 4-2 is suspended through the upper suspension of the upper-suspended MWD system provided with the MWD outer cylinder. device or the lower seat key device of the lower seat key type MWD system is electrically connected to the MWD connecting drill collar 11, and a metal structure is arranged between the MWD outer cylinder and the MWD connecting drill collar 11 to ensure that the MWD system is installed inside the drill collar. While realizing structural installation, the electrical connection between the MWD outer cylinder and the MWD connecting drill collar 11 is realized.

One end of the short internal electrical isolation tube 10 is connected to the first pressure-resistant outer tube 4-1 through threads and a sealing ring, and the other end of the short internal electrical isolation tube 10 is connected to the metal lantern centralizer through threads and a sealing ring 8 connections;

The first anti-pressure outer cylinder 4-1 and the metal lantern centralizer 8 are electrically isolated through the inner electrical isolation short cylinder 10; the MWD connection drill collar 11 and the screw connection drill collar 13 are electrically isolated through the drill collar insulation nipple 12. The electromagnetic signal sent by the geosteering measurement and launching system near the drill bit passes through the formation, the MWD connecting drill collar 11, the MWD outer cylinder, the second compression outer cylinder 4-2, the adapter cylinder (5), the first connecting screw 9-1, The first electrical connection line 14, the receiving circuit pup joint 6, the electrical connector 15, the second connection line 16, the second connection screw 9-2, the metal lantern centralizer 8, the screw rod connection drill collar 13 and the geosteering measurement launch near the drill bit The system forms a loop to realize the underground wireless short transmission reception of signals.

The MWD adapter barrel 1 is electrically connected to the MWD outer barrel, and the other end inside the MWD adapter barrel 1 is connected to the battery short joint 3 through the first rubber shock absorber 2-1; the inner end of the adapter barrel 5 is connected through the guide hole and The vibration damping gasket is softly connected to the battery short section 3, and the other end inside the adapter tube 5 is connected to the receiving circuit short section 6 through the second rubber shock absorber 2-2; the power cord of the battery short section 3 passes through The damping gasket, the adapter barrel 5 and the second rubber shock absorber provide power for the short joint 6 of the receiving circuit and the entire receiving device. One end inside the MWD adapter tube 1 realizes data communication with the MWD system through an electrical connector, and the receiving circuit nipple 6 transmits the data received by the receiving device to the MWD system, and the data received by the receiving device in the utility model is passed through the MWD system. The system transmits to the ground.

The outside of the MWD adapter cylinder 1 is connected to the second pressure-resistant outer cylinder 4-2 through threads and a sealing ring, and the second pressure-resistant outer cylinder 4-2 is connected to one end of the outside of the adapter cylinder 5 through threads and a sealing ring The other end of the adapter cylinder 5 is connected to the first pressure-resistant outer cylinder 4-1 through a thread and a sealing ring.

The receiving device adopts a probe-type structure that is convenient for communication with the MWD. There is no connection structure between the internal probe and the drill collar that needs to be disassembled, which facilitates data communication with the MWD and meets the requirements for salvageability. Under certain circumstances, the entire receiving device can be pulled out of the ground together with the MWD system. There is no detachable connection structure between the receiving device and the drill collar, so it is not necessary to pull out the drill for disassembly.

Claims (9)

1. a kind of reception device suitable for the underground wireless short pass of nearly drill bit, it is characterised in that the reception device includes electric The centre of isolation drill collar (7) and the short cylinder of interior electrical isolation (10), the electrical isolation drill collar (7) and the short cylinder of interior electrical isolation (10) Insulating short section is serially connected with to realize electrical isolation, the reception device is separated to form connecing for electrical isolation by the insulating short section Receive positive pole and receive negative pole；The reception device is also included for realizing that the wireless short pass that the short pass of downhole wireless signal is received is received Unit.

2. reception device according to claim 1, it is characterised in that the electrical isolation drill collar (7) includes that MWD connections are bored Quickly (11), drill collar insulating short section (12), screw rod connect drill collar (13)；MWD connect drill collar (11) and screw rod connect drill collar (13) by Nonmagnetic steel material is made, and drill collar insulating short section (12) is made up of insulating materials, and the two ends of drill collar insulating short section (12) are not by Detachable screw thread is connected drill collar (11) with MWD respectively and screw rod connects drill collar (13) connection, to realize electrical isolation.

3. reception device according to claim 2, it is characterised in that the interior short cylinder of electrical isolation (10) is including top connection (17), inner cylinder insulating short section (18) and lower contact (19)；Wherein, the top connection (17) and the lower contact (19) uses metal Material is made, and the inner cylinder insulating short section (18) is made up of insulating materials, and the two ends of the inner cylinder insulating short section (18) pass through Non-dismountable screw thread is connected with the top connection (17) and the lower contact (19) respectively.

4. reception device according to claim 3, it is characterised in that the wireless short pass receiving unit includes being sequentially connected MWD transfer cylinder (1), the second resistance to compression outer barrel (4-2), switching cylinder (5), the first terminal screw (9-1), the first electric connection line (14), receiving circuit pipe nipple (6), electric connector (15), the second connecting line (16), the second terminal screw (9-2), metal lantern are helped Positive device (8)；

Wherein, described receiving circuit pipe nipple (6) one end by the first connecting line (14) through the second rubber absorbers (2-2) and First terminal screw (9-1) is connected with switching cylinder (5), and switching cylinder (5) is by the second resistance to compression outer barrel (4-2) and MWD switchings cylinder (1) Connection；The other end of the receiving circuit pipe nipple (6) by through the internal electric connector (15) of the short cylinder of interior electrical isolation (10), Second connecting line (16) and the second terminal screw (9-2) are connected with metal lantern centralizer (8).

5. reception device according to claim 4, it is characterised in that the upper suspension arrangement of upper suspension type mwd system or under The lower seat key apparatus of seat keyed mwd system pass through MWD switchings cylinder (1) and MWD of MWD outer barrels and the reception device with MWD Connection drill collar (11) connection；Metal lantern centralizer (8) is connected drill collar (13) with screw rod and realizes electric phase by the metal wing for opening Even.

6. reception device according to claim 4, it is characterised in that the outside one end of the interior short cylinder of electrical isolation (10) It is connected with the first resistance to compression outer barrel (4-1) by screw thread and sealing ring, the outside other end of the interior short cylinder of electrical isolation (10) leads to Screw thread and sealing ring is crossed to be connected with metal lantern centralizer (8)；

7. reception device according to claim 4, it is characterised in that MWD cylinders (1) of transferring are electrically connected with the realization of MWD outer barrels, MWD switchings cylinder (1) the internal other end is connected by the first rubber absorbers (2-1) with battery short section (3)；In switching cylinder (5) The one end in portion is realized being flexible coupling by pilot hole and damping pad with the battery short section (3), the internal other end of switching cylinder (5) It is connected with receiving circuit pipe nipple (6) by the second rubber absorbers (2-2)；The power line of battery short section (3) through damping pad, Switching cylinder (5), the second rubber shock absorber are that receiving circuit pipe nipple (6) and whole reception device provide power supply.

8. reception device according to claim 7, it is characterised in that the outside of MWD switchings cylinder (1) by screw thread and Sealing ring is connected with the second resistance to compression outer barrel (4-2), and the second resistance to compression outer barrel (4-2) is by screw thread and sealing ring and switching cylinder (5) outside one end connection, the outside other end of switching cylinder (5) passes through screw thread and sealing ring and the first resistance to compression outer barrel (4- 1) connect.

9. reception device according to claim 1, it is characterised in that the reception device is using being easy to what is communicated with MWD Probe type structure.