Multi-probe azimuth gamma drill collar

Abstract

A multi-probe azimuthal gamma drill collar comprises a non-magnetic body, a pressure-resistant outer cylinder, a gamma probe, a probe housing and a suspension disc. The non-magnetic body has a cylindrical shell structure, a groove is provided on the side wall of the non-magnetic body, a detection component and a positioning component are located in the groove of the non-magnetic body, the positioning component comprises a radiation shielding block, polyetheretherketone resin, the radiation shielding block is located between the independent split component and the groove of the non-magnetic body, the gamma probe has an independent split protection component, the independent split protection component comprises a probe upper plug and a probe housing, the pressure-resistant outer cylinder integrates an accelerometer, a battery pack and a wire passing tube, and two stabilizers are arranged between the accelerometer and the battery pack. The present invention performs a groove process on the outer side of the drill collar column, performs an independent split protection on the gamma probe, a circuit board cover is independently designed with a reading port, and the upper part of the drill collar is universally designed, so as to realize the simplification and universalization of the drilling azimuthal gamma logging equipment, and at the same time improve the measurement accuracy and azimuthal imaging of the instrument.

Description

Technical Field

[0001] The invention relates to a logging while drilling device in oil and gas exploration and production drilling construction, in particular to a multi-probe azimuth gamma drill collar. Background Art

[0002] In recent years, in the field of logging while drilling in the drilling industry, azimuthal gamma logging technology has been widely used. Azimuthal gamma logging while drilling uses multiple detectors to detect natural radioactivity in the formation during the drilling process. Its measurement data has azimuthal characteristics, which can not only realize conventional natural gamma applications, but more importantly, it can be used for geological guidance and azimuthal gamma imaging of the formation to better evaluate the formation.

[0003] At present, domestic drilling mostly uses large-diameter drill collars. Azimuth gamma logging while drilling requires slotting the drill collar body, placing multiple probes in the drill collar, and covering it with a cover plate. The slotting position of the drill collar is close to the drill bit, and the vibration of the drill bit will affect the data collected by the probe. This design has strict requirements on the strength, sealing, and shock absorption of the cover plate, and it is difficult to maintain; the supporting circuit board also uses a design of slotting in the body and setting a cover plate. If data needs to be read, the cover plate must be opened, which is cumbersome to operate; and the existing azimuth gamma logging while drilling equipment in China is mostly designed individually or as a whole set, which is costly and inefficient in actual operations. Summary of the invention

[0004] The invention aims at solving the problems in the prior art and provides a multi-probe azimuth gamma drill collar.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A multi-probe azimuth gamma drill collar comprises a non-magnetic body, a pressure-resistant outer cylinder, a gamma probe, a probe shell and a suspension disc. The non-magnetic body has a cylindrical shell structure. A groove is provided on the side wall of the non-magnetic body. A detection component and a positioning component are located in the groove of the non-magnetic body. The positioning component comprises a radiation shielding block, a polyetheretherketone resin, and the radiation shielding block is located between the independent split component and the groove of the non-magnetic body. The gamma probe has an independent split protection component, and the independent split protection component comprises an upper probe plug and a probe shell. The lower probe plug is located in the groove of the non-magnetic body. The upper probe plug and the lower probe plug are both provided with sealing rubber rings. The gamma probe is first installed with a shock-absorbing silicone pad. Then send it into the probe housing, screw in the upper plug and the lower plug of the probe to complete the installation of the independent split protection component, place the suspension disc inside the non-magnetic body, the upper part of the suspension disc is connected to the four-core slip ring, the lower part of the suspension disc is connected to the pressure-resistant outer cylinder through the upper conversion head, the suspension disc is positioned with the non-magnetic body through the positioning ring, a retractable connecting rod is arranged inside the non-magnetic body, one end of the retractable connecting rod is connected to the suspension disc, and the other end of the retractable connecting rod is connected to the subsequent equipment, the communication method between the retractable connecting rod and the gamma probe adopts four-core slip ring communication, the pressure-resistant outer cylinder integrates the accelerometer, battery pack and wire passing tube, and two stabilizers are arranged between the accelerometer and the battery pack.

[0007] The above-mentioned independent split protection component is parallel to the radial direction of the non-magnetic body.

[0008] A radiation shielding block is arranged between the independent split protection component and the inner wall of the groove of the non-magnetic body, and the independent split protection component is connected to the non-magnetic body by screws.

[0009] Two sealing rubber rings are arranged in the radial direction of the above-mentioned suspension disc, and the connection methods are both threaded connection. The surface of the suspension disc is grooved for installing the pin socket and connecting it to the circuit board.

[0010] Two grooves are arranged in the middle of the non-magnetic body, and the angle between the two grooves is 120°, which are used to install the communication board and the main control board. A sealing ring groove is arranged on the grooved surface for installing the sealing rubber ring. A countersunk screw hole is arranged on the communication main control cover plate for connecting the communication main control cover plate and the non-magnetic body.

[0011] The above-mentioned non-magnetic body is provided with three grooves on the upper part, and the angle between the three grooves is 120°, which are used to install the azimuth circuit board, the terminal circuit board, and the power control board. The grooved surface is provided with a sealing ring groove for installing the sealing rubber ring. The circuit reading port cover is provided with a through hole for installing the reading port plug. The reading port plug is provided with two sealing rubber rings. A pin baffle is provided under the reading port plug for positioning the pin seat. The circuit reading port cover is provided with a countersunk screw hole for connecting the circuit reading port cover and the non-magnetic body.

[0012] A transition ring is arranged inside the non-magnetic body. The transition ring adopts a trapezoidal hole design and is used to change the diameter of the mud diversion channel. After the mud passes through the transition ring, the diameter will increase.

[0013] The present invention performs groove processing on the outer side of the drill collar column, performs independent split protection on the gamma probe, designs a reading port on the circuit board cover separately, and performs a universal design on the upper part of the drill collar, thereby achieving simplification and universalization of the while-drilling azimuthal gamma logging equipment and improving the measurement accuracy and azimuthal imaging of the instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the internal structure of the non-magnetic body of the present invention;

[0017] Figure 3 It is a schematic diagram of the internal structure of the probe housing of the present invention;

[0018] Figure 4 It is a schematic diagram of the top view of the structure of the present invention;

[0019] Figure 5 It is a top view schematic diagram of the internal structure of the present invention;

[0020] Figure 6 yes Figure 4 Structural diagram of the CC section;

[0021] Figure 7 A schematic structural diagram of the pressure-resistant outer cylinder of the present invention.

[0022] In the figure, 1 is a non-magnetic body, 2 is a probe upper plug, 3 is a pressure-resistant outer tube, 4 is a probe shell, 5 is a probe lower plug, 6 is an accelerometer, 7 is a shock-absorbing silicone pad, 8 is a centralizer, 9 is a centralizer, 10 is a reading port plug, 11 is a pin baffle, 12 is a circuit reading port cover, 13 is a wire hole plug, 14 is a battery pack, 15 is a wire tube, 16 is a communication main control cover, 17 is a transition ring, 18 is a positioning short tube, 19 is a hanging disc, 20 is a pin sleeve, 21 is a pin lower connection, 22 is a four-core slip ring, 23 is a ray shielding block, 24 is a telescopic connecting rod, 25 is a positioning ring, 26 is an upper conversion head, and 27 is a gamma probe. DETAILED DESCRIPTION

[0023] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, a multi-probe azimuth gamma drill collar includes a non-magnetic body 1, a probe upper plug 2, a probe housing 4, a probe lower plug 5, a shock-absorbing silicone pad 7, a reading port plug 10, a pin baffle 11, a circuit reading port cover 12, a wire hole plug 13, a communication main control cover 16, a transition ring 17, a positioning short cylinder 18, a hanging disc 19, a pin sleeve 20, a pin lower connection 21, a four-core slip ring 22, a ray shielding block 23, a positioning ring 25, an upper conversion head 26, and a gamma probe 27.

[0024] The non-magnetic body 1 is a cylindrical shell machined from non-magnetic stainless steel N1310B, with NC50 drill pipe threads at both ends. A groove is provided on the side wall of the non-magnetic body 1, and a mud diversion channel is provided in the groove. The independent split assembly includes a probe upper plug 2, a probe housing 4, and a probe lower plug 5 located in the groove. The probe upper plug 2 and the probe lower plug 5 are both provided with sealing rubber rings. The probe is first installed with a shock-absorbing silicone pad 7 and then sent into the probe housing 4, and the probe upper plug 2 and the probe lower plug 5 are screwed in to complete the installation of the independent split assembly. The independent split assembly is parallel to the radial direction of the non-magnetic body. The ray shielding plate 23 is arranged between the independent split assembly and the inner wall of the non-magnetic body groove, and the independent split assembly is fixedly connected to the non-magnetic body 1 by screws. A suspension disc 19 is provided inside the non-magnetic body 1, the upper part is connected to the four-core slip ring 22, and the lower part is connected to the upper conversion head 26. Two sealing rubber rings are provided in the radial direction, and the connection method is threaded connection. Its surface is provided with slots for installing pin sockets and connecting with circuit boards. The suspension disc 19 is positioned with the non-magnetic body 1 through a positioning ring 25. The non-magnetic body 1 has a retractable connecting rod inside, one end of which is connected to the suspension disc, and the other end of which is connected to subsequent equipment. The communication method between the retractable connecting rod and the azimuth gamma adopts a four-core slip ring 22 communication, and rubber sealing rings are provided at both ends. Two grooves are provided in the middle of the non-magnetic body 1, and the angle between the two grooves is 120°, which are used to install the communication board and the main control board. A sealing ring groove is provided on the slotted surface for installing a sealing rubber ring. A countersunk screw hole is provided on the communication main control cover plate 16 for connecting the communication main control cover plate 16 with the non-magnetic body 1. The non-magnetic body 1 is provided with three grooves on the upper part, and the angle between the three grooves is 120°, which are used to install the azimuth circuit board, the terminal circuit board, and the power control board. The grooved surface is provided with a sealing ring groove for installing a sealing rubber ring. The circuit reading port cover plate 12 is provided with a through hole for installing the reading port plug 10. The reading port plug is provided with two sealing rubber rings. A pin baffle 11 is provided below the reading port plug for positioning the pin seat. The circuit reading port cover plate 12 is provided with a countersunk screw hole for connecting the circuit reading port cover plate 12 with the non-magnetic body 1. A transition ring 17 is provided inside the non-magnetic body 1, which adopts a trapezoidal channel design to change the diameter of the mud diversion channel. After the mud passes through the transition ring 17, the diameter will increase. The pressure-resistant outer cylinder 3 adopts a design that integrates the accelerometer 6, the battery pack 14 and the wire tube 15, and is provided with a centralizer 8 and a centralizer 9, which solves the problem of centering the entire string of pressure-resistant outer cylinders during installation and optimizes the installation difficulty. The pressure-resistant outer cylinder 3 is connected to the suspension disc 19 through the upper conversion head 26 by threaded connection, so that the whole instrument is integrated and disassembled more conveniently. After the probe, probe housing, upper and lower plugs are installed, they are screwed into the non-magnetic body 1 by screws. After the installation and debugging of each circuit board is completed, they are installed into the corresponding circuit board slots, the cover plate is covered, and the reading port plug 10 is screwed in.Each circuit board and the pressure-resistant outer tube are routed through the wire holes with a diameter of 8mm in the body, and after the wiring is completed, the wire hole plug 13 is screwed in. The pressure-resistant outer tube is connected to the suspension disc 19 through the upper conversion head 26, and the entire instrument is sent into the body through a special drawing tool.

Claims

1. A multi-probe azimuth gamma drill collar, characterized by It includes a non-magnetic body, a pressure-resistant outer cylinder, a gamma probe, a probe shell and a hanging disc. The non-magnetic body has a cylindrical shell structure. A groove is opened on the side wall of the non-magnetic body. The detection component and the positioning component are located in the groove of the non-magnetic body. The positioning component includes a radiation shielding block and polyetheretherketone resin. The radiation shielding block is located between the independent split component and the groove of the non-magnetic body. The gamma probe has an independent split protection component. The independent split protection component includes an upper probe plug and a probe shell. The lower probe plug is located in the groove of the non-magnetic body. The upper probe plug and the lower probe plug are both provided with sealing rubber rings. The gamma probe is first installed with a shock-absorbing silicone pad and then sent into the probe shell. The upper probe plug and the lower probe plug are screwed in to complete the installation of the independent split protection component. The hanging disc is placed inside the non-magnetic body. The upper part of the hanging disc is connected to the four-core slip ring. The lower part of the hanging disc is connected to the pressure-resistant outer cylinder through an upper conversion head. The hanging disc is positioned with the non-magnetic body through a positioning ring. A retractable connecting rod is arranged inside the non-magnetic body, one end of the retractable connecting rod is connected to the suspension disc, and the other end of the retractable connecting rod is connected to the subsequent equipment. Three grooves are arranged on the upper part of the non-magnetic body, and the angle between the three grooves is 120°, which is used to install the azimuth circuit board, the terminal circuit board, and the power control board. A sealing ring groove is arranged on the slotted surface for installing the sealing rubber ring. A through hole is arranged on the circuit reading port cover plate for installing the reading port plug. Two sealing rubber rings are arranged on the reading port plug. A pin baffle is arranged under the reading port plug for positioning the pin seat. A countersunk screw hole is arranged on the circuit reading port cover plate for connecting the circuit reading port cover plate and the non-magnetic body. The communication mode between the retractable connecting rod and the gamma probe adopts four-core slip ring communication. The pressure-resistant outer cylinder integrates the accelerometer, the battery pack and the wire passing tube. Two stabilizers are arranged between the accelerometer and the battery pack. A transition ring is arranged inside the non-magnetic body, and the transition ring adopts a trapezoidal channel design.

2. The multi-probe azimuth gamma drill collar according to claim 1, characterized in that The independent split protection component is parallel to the radial direction of the non-magnetic body.

3. The multi-probe azimuth gamma drill collar according to claim 1, characterized in that A ray shielding block is arranged between the independent split protection component and the inner wall of the groove of the non-magnetic body, and the independent split protection component is connected to the non-magnetic body through screws.

4. The multi-probe azimuth gamma drill collar according to claim 1, characterized in that Two sealing rubber rings are arranged in the radial direction of the suspension disc, and the connection methods are both threaded connections. The surface of the suspension disc is grooved for installing the pin socket and connecting it to the circuit board.

5. The multi-probe azimuth gamma drill collar according to claim 1, characterized in that Two grooves are set in the middle of the non-magnetic body, and the angle between the two grooves is 120°, which are used to install the communication board and the main control board. A sealing ring groove is set on the grooved surface for installing the sealing rubber ring. A countersunk screw hole is set on the communication main control cover plate for connecting the communication main control cover plate and the non-magnetic body.

Images