Guide head with near-bit imaging gamma

Abstract

The invention relates to the technical field of petroleum drilling downhole testing instruments, in particular to a guide head with near-bit imaging gamma. The guide head with the near-bit imaging gamma comprises a flexible short section, a guide mechanism mandrel is connected to the lower portion of the flexible short section, a sleeve box mechanism body is connected to the lower portion of the guide mechanism mandrel, a lower connector body is connected to the lower portion of the guide mechanism body, and an upper end assembly and an upper control module are arranged in the guide mechanism mandrel; the upper control module comprises an upper control body which is uniformly provided with an arc groove and a circuit board groove, a gamma sensor is arranged in the arc groove, an upper rotary transformer circuit module and a gamma circuit module are arranged in the circuit board groove, and a protective sleeve is arranged outside the upper control body. The gamma sensor is installed on the upper control module to advance the near-bit imaging gamma position, the change of an environment gamma signal can be sensed in time, the advancing route of the device can be trimmed in time, the drilling rate of a sandstone reservoir in work is guaranteed, and the influence on an oil well after production is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of downhole testing instruments for oil drilling, in particular to a guide head with near-drill-bit imaging gamma. Background Art

[0002] When the drill bit drills out of the reservoir during downhole operations, it is necessary to promptly determine whether it is drilled out from the upper or lower part of the reservoir. The basis for this determination is the change in the gamma value detected by the instrument. In the prior art, the rotary guide tool used, due to the limitation of the tool structure, is in the form of a separate gamma short section attached to the back of the flexible short section, which is far away from the drill bit. When the instrument detects the change in the gamma value and re-enters the reservoir for guiding operations, the device has already drilled a distance, which seriously affects the drilling rate of the sandstone reservoir and has a great impact on the production of the oil well after it is put into production. Therefore, in view of the above shortcomings, a guide head with near-drill-bit imaging gamma is proposed. Summary of the invention

[0003] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides a guide head with near-drill-bit imaging gamma, which solves the problem of abnormal drilling rate in sandstone reservoirs due to the inability to adjust the drill bit guidance in time because the near-drill-bit imaging gamma is too far away from the drill bit.

[0004] (II) Technical solution In order to solve the above problems, the present invention provides a guide head with near-drill-bit imaging gamma, comprising: A flexible short circuit, wherein the flexible short circuit is connected to the guide mechanism core shaft at the bottom, and an upper control module is arranged in the guide mechanism core shaft; the guide mechanism core shaft is connected to the guide mechanism body at the bottom, and the guide mechanism body is connected to the lower joint body at the bottom; the upper control module includes an upper control body, and a plurality of arc grooves are evenly arranged on the upper control body, and a shielding layer is arranged at the bottom of each arc groove; a gamma sensor is arranged in each arc groove; a protective cover is arranged outside the upper control body; a gamma circuit module and an upper rotary transformer circuit module are arranged on the upper control body.

[0005] Preferably, an upper end assembly is provided above the upper control module inside the guide machine head core shaft, and the upper end assembly is connected to the guide machine head core shaft by bolts.

[0006] Preferably, an upper bearing module is provided at the lower end of the outer portion of the guide mechanism core shaft, a lower control module is provided inside the guide mechanism body, and a hydraulic module is provided on the outer wall of the guide mechanism body below the lower control module.

[0007] Preferably, the upper control body is provided with four circuit board slots, and the gamma circuit module and the upper resolver circuit module are each allocated two circuit board slots.

[0008] Preferably, the upper control body is provided with a plurality of pin holes, and each pin hole is provided with a pin.

[0009] Preferably, a first oblique hole penetrating to the guide mechanism core shaft is provided on the side of the guide mechanism body, and a second oblique hole obliquely penetrating inward to the upper control module is provided on the guide mechanism core shaft, and the position of the first oblique hole corresponds to the second oblique hole.

[0010] Preferably, a wire passes through the first oblique hole and the second oblique hole, a rubber sleeve female pin is provided at the end of the wire, and the end of the rubber sleeve female pin is connected to the top of the pin.

[0011] Preferably, a lower bearing module is provided on the lower joint body.

[0012] Preferably, the upper control body is stepped, and a plurality of sealing rings are respectively provided at both ends.

[0013] (III) Beneficial effects The guide head with near-bit imaging gamma provided by the present invention has an arc groove on the upper control module, and a gamma sensor is arranged in the arc groove to greatly move the measuring point of the near-bit gamma sensor forward, so that the device can judge the drilling tool reservoir situation earlier and improve the working efficiency of the device; at the same time, due to the forward movement of the gamma sensor, a near-bit imaging gamma short section is eliminated, the length of the rotary guide tool is shortened, the required components are reduced, and the economy of the device is improved; by arranging a shielding cover in the arc groove, 16-sector measurement of the near-bit imaging gamma is realized, and the measurement effect of the device is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the guide head with near-drill-bit imaging gamma of the present invention; Figure 2 It is a transverse cross-sectional view of the control body on the guide head with near-drill-bit imaging gamma of the present invention; Figure 3 This is a structural diagram of the control body on the guide head with near-drill-bit imaging gamma of the present invention; Figure 4 The present invention is a guide head with near-drill-bit imaging gamma Figure 3 Middle AA surface section; Figure 5 This is a cross-sectional view of a control module on a guide head with near-drill-bit imaging gamma according to the present invention.

[0015] Among them, 1. flexible short section; 2. guide mechanism core shaft; 3. upper end assembly; 4. upper control module; 5. upper bearing module; 6. guide mechanism body; 7. lower control module; 8. hydraulic module; 9. lower bearing module; 10. lower joint body; 401. upper control body; 402. protective cover; 403. pin; 404. gamma sensor; 405. shielding layer; 406. upper rotary transformer circuit module; 407. gamma circuit module. Implementation

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by “upper”, “lower”, “inside”, “outside”, “top”, “bottom”, etc. are all based on the orientations or positional relationships shown in the accompanying drawings. The purpose is only to facilitate the description of the present invention and simplify the description. It does not indicate or imply that the referred parts must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] like Figure 1-5 As shown, the present invention provides a guide head with near-drill bit imaging gamma, specifically comprising: a flexible short section 1, wherein the flexible short section 1 serves as a connection, the flexible short section 1 is connected to a guide mechanism core shaft 2 below, the guide mechanism core shaft 2 is connected to a guide mechanism body 6 below, and the guide mechanism body 6 is connected to a lower joint body 10 below.

[0019] The guide mechanism core shaft 2 is provided with an upper control module 4 inside, and the upper control module 4 is used to install the electronic components required for the device. The guide mechanism core shaft 2 is provided with an upper end assembly 3 above the upper control module 4, which is used to connect, install and fix the upper control module 4. It should be noted that the upper end assembly 3 is connected to the guide mechanism core shaft 2 by bolts, and an inclined upper end external joint is provided in the upper end assembly 3. When the upper end assembly 3 is locked by bolts, the upper end external joint is squeezed outward to achieve the purpose of locking and fixing.

[0020] In the present invention, an upper bearing module 5 is provided at the lower end of the outer portion of the guide mechanism core shaft 2, a lower control module 7 is provided inside the guide mechanism body 6, a hydraulic module 8 is provided on the outer wall of the guide mechanism body 6 below the lower control module 7, and a lower bearing module 9 is provided on the lower joint body 10.

[0021] The upper control module 4 and the lower control module 7 cooperate to control the device and process and transmit signals, and the upper bearing module 5 and the lower bearing module 9 cooperate to reduce the friction between the device and other external devices during operation, thereby reducing the wear of the device. The hydraulic module 8 collects and transmits the pressure signal received in real time during the operation of the device.

[0022] It should be noted that an inwardly penetrating inclined hole is provided on the guide mechanism body 6, one end of the inclined hole is connected to the guide mechanism core shaft 2, and an inclined hole corresponding to the guide mechanism body 6 is also provided on the guide mechanism core shaft 2, and the end of the inclined hole is connected to the upper control module 4. After the inclined holes of the guide mechanism body 6 and the guide mechanism core shaft 2 are aligned, a wire is connected to the lower control module 7, and the wire is inserted into the inclined hole. A rubber sleeve female pin is provided at the end of the wire for connecting the upper control module 4 with the guide mechanism body 6.

[0023] like Figure 2-5 As shown, the upper control module 4 includes an upper control body 401 , a protective cover 402 , a pin 403 , a gamma sensor 404 , a shielding layer 405 , an upper resolver circuit module 406 and a gamma circuit module 407 .

[0024] The upper control body 401 is provided with a protective cover 402 for protecting other components installed on the upper control body 401 . Meanwhile, the upper control body 401 is stepped, which can better combine with the protective cover 402 and strengthen the fixation of the protective cover 402 .

[0025] It should be noted that a plurality of sealing rings are respectively provided at both ends of the upper control body 401 to ensure the airtightness of the device and prevent water from entering the upper control module 4 .

[0026] In the present invention, an upper end assembly 3 is provided above the upper control module 4 inside the guide mechanism core shaft 2 for fixing and pressing the upper control module 4, and the upper end assembly 3 and the guide mechanism core shaft 2 are connected by bolts.

[0027] Among them, there is an inclined external joint in the upper end assembly 3. When the upper end assembly 3 is tightened with bolts, the external joint is squeezed outward to achieve the purpose of retraction.

[0028] like Figure 5 As shown, the upper control body 401 is evenly provided with two arc grooves and four circuit board grooves, the bottom surface of each arc groove is provided with a shielding layer 405, and each arc groove is provided with a gamma sensor 404, and the gamma sensor 404 is used to receive the gamma signal to determine whether the drill position of the device has drilled out of the sandstone reservoir. The shielding layer 405 can shield the gamma signal in some directions so that the direction of the gamma signal received by the device is clearer, and at the same time realize the fan-shaped stratification of the gamma signal.

[0029] Among them, the upper rotary converter circuit module 406 and the gamma circuit module 407 occupy two circuit board slots respectively. The gamma circuit module 407 supplies power to the gamma sensor 404 and processes the signals received by it. The upper rotary converter circuit module 406 converts electrical energy and signals into wireless transmissions to the lower control module 7 to ensure the normal operation of the lower control module 7.

[0030] It should be noted that the upper rotary converter circuit module 406 was originally composed of four circuit boards, including one signal board and three non-contact circuit boards, and is now optimized into two circuit boards. The two non-contact circuit boards are integrated into one circuit board, and the other non-contact circuit board and a signal board are integrated into one circuit board. The two integrated boards occupy one circuit board slot respectively; the gamma circuit module 407 was originally composed of four circuit boards, including one signal board, one high-voltage board, one main control board and one power board, and is now optimized into two circuit boards. The high-voltage board and the power board are integrated into one circuit board and occupy one circuit board slot respectively with the main control board; wherein, the gamma circuit module 407 and the upper rotary converter circuit module 406 share one signal board.

[0031] In the present invention, two pins 403 are provided on the upper part of the upper control body, and the ends of the pins 403 are connected to the rubber sleeve female pins to connect the electric energy and signals to the guide mechanism body 6. When the device is disassembled, only the rubber sleeve female pins need to be unplugged to remove the upper control body 401 using tooling, which is simple to operate.

[0032] The guide head with near-bit imaging gamma provided by the present invention greatly moves the measuring point of the near-bit gamma sensor forward, so that the device can judge the drilling tool reservoir condition earlier and improve the working efficiency of the device; at the same time, due to the forward movement of the gamma sensor, the length of the rotary guide tool is shortened, the required components are reduced, and the economy of the device is improved; by providing a shielding cover in the arc groove, 16-sector measurement of the near-bit imaging gamma is realized, and the measurement effect of the device is improved. The installation and use process of the device is as follows: Step 1: Install the gamma sensor into the upper control body and fix it with bolts. Pour potting glue into the gap between the gamma sensor and the upper control body. At the same time, inject the remaining circuit boards into glue blocks and connect them through wires.

[0033] Step 2: Send the assembled upper control module to the designated location through the tooling and install the entire device.

[0034] Step three, lower the device into the well and drill according to a pre-set route. During the drilling process, the gamma sensor in the upper control module continuously receives the gamma signal of the surrounding environment. When the device drills out of the sandstone reservoir, the environmental gamma signal changes. After receiving the signal, the gamma sensor determines the direction in which the device drills out of the sandstone reservoir based on the change in the signal, and then adjusts the drilling direction of the device to ensure the working efficiency of the device and the drilling rate of the sandstone reservoir.

[0035] Step 4: After drilling is completed, the device is disassembled and recycled.

[0036] The guide head with near-bit imaging gamma of the present invention greatly moves the measuring point of the near-bit gamma sensor forward, so that the device can judge the drilling tool reservoir condition earlier and improve the working efficiency of the device; at the same time, due to the forward movement of the gamma sensor, a near-bit imaging gamma short section is eliminated, the length of the rotary guide tool is shortened, the required components are reduced, and the economy of the device is improved; by arranging a shielding cover in the arc groove, 16-sector measurement of the near-bit imaging gamma is realized, and the measurement effect of the device is improved.

[0037] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A guide head with near-bit imaging gamma, It is characterized in that include: A flexible short circuit (1), wherein the lower part of the flexible short circuit (1) is connected to a guide mechanism core shaft (2), and an upper control module (4) is arranged inside the guide mechanism core shaft (2); the lower part of the guide mechanism core shaft (2) is connected to a guide mechanism body (6), and the lower part of the guide mechanism body (6) is connected to a lower joint body (10); the upper control module (4) comprises an upper control body (401), and a plurality of arc grooves are evenly arranged on the upper control body (401), and a shielding layer (405) is arranged at the bottom of each arc groove; a gamma sensor (404) is arranged inside each arc groove; a protective cover (402) is arranged outside the upper control body (401); and a gamma circuit module (407) and an upper rotary converter circuit module (406) are arranged on the upper control body (401).

2. The guide head with near-bit imaging gamma according to claim 1, It is characterized in that An upper end assembly (3) is provided above the upper control module (4) inside the guide machine head spindle (2), and the upper end assembly (3) is connected to the guide machine head spindle (2) via bolts.

3. The guide head with near-bit imaging gamma according to claim 1, It is characterized in that An upper bearing module (5) is provided at the lower end of the outer portion of the guide mechanism core shaft (2), a lower control module (7) is provided inside the guide mechanism body (6), and a hydraulic module (8) is provided on the outer wall of the guide mechanism body (6) below the lower control module (7).

4. The guide head with near-bit imaging gamma according to claim 1, It is characterized in that The upper control body (401) is provided with four circuit board slots, and the gamma circuit module (407) and the upper rotary converter circuit module (406) are each allocated two circuit board slots.

5. The guide head with near-bit imaging gamma according to claim 1, It is characterized in that The upper control body (401) is provided with a plurality of pin insertion holes, each of which is provided with a pin (403).

6. The guide head with near-bit imaging gamma according to claim 1, It is characterized in that A first oblique hole penetrating to the guide mechanism core shaft (2) is provided on the side of the guide mechanism body (6); a second oblique hole obliquely penetrating inwards to the upper control module is provided on the guide mechanism core shaft (2); the first oblique hole corresponds to the second oblique hole.

7. The guide head with near-bit imaging gamma according to claim 6, It is characterized in that A wire passes through the first oblique hole and the second oblique hole, and a rubber sleeve female plug pin is provided at the end of the wire, and the end of the rubber sleeve female plug pin is connected to the top of the plug pin (403).

8. The guide head with near-bit imaging gamma according to claim 1, It is characterized in that A lower bearing module (9) is provided on the lower joint body (10).

9. The guide head with near-bit imaging gamma according to claim 1, It is characterized in that The upper control body (401) is stepped, and a plurality of sealing rings are respectively provided at both ends.

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