Coiled tubing radioactive logging combination device

Abstract

The invention discloses a coiled tubing radioactive logging combination device which comprises an anti-radiation short section, a rotary short section and a flexible short section which are connected in sequence. The anti-radiation short section is used for shielding rays of an underground radioactive source; the rotary short section is used for realizing 360-degree rotation between the anti-radiation short section and the flexible short section; the flexible short section is matched with the rotary short section and used for enabling the logging instrument to achieve all-directional flexible swing under the well. The combined device can realize a shielding function on rays of an underground radioactive source, and continuously performs radiation protection on ground constructors; meanwhile, radial torsion protection can be provided for the basket, an instrument and a radioactive source are prevented from falling into a well due to damage of the basket, and the operation construction safety of the radioactive source is protected; and finally, the risk that the weak point position of an existing multi-stage flexible short section is easily pulled off is also solved.

Description

Technical Field

[0001] This invention belongs to the field of oilfield radioactive cementing quality logging construction technology, specifically relating to a coiled tubing radioactive logging assembly. Background Technology

[0002] With the development of cementing quality logging technology for small-diameter horizontal wells and the gradual maturation of coiled tubing transfer technology, coiled tubing skids are typically used to transfer the radioactive cementing quality logging instrument into the well via coiled tubing and connecting it to a connecting section and a fabricated basket. However, during the logging process, due to the limitations of existing coiled tubing transfer technology for radioactive cementing quality logging instruments, firstly, the lack of a radioactive shielding device means that personnel installing wellhead tools on the drilling rig will suffer prolonged radiation damage after the source is loaded; secondly, the lack of a rotation mechanism can cause the instrument and protective basket to break due to excessive radial torque on the coiled tubing, resulting in damage to the instrument and radioactive source falling into the well; finally, the lack of a flexible device leads to two problems: on the one hand, when installing wellhead equipment on the surface, the coiled tubing and downhole tools cannot be vertically aligned, making male and female thread connections difficult and greatly reducing construction efficiency; on the other hand, in horizontal wells with excessively large doglegs, the instrument is prone to obstruction, leading to logging failure. Summary of the Invention

[0003] This invention provides a continuous tubing radiometric logging assembly to address the aforementioned technical deficiencies.

[0004] To achieve the above objectives, the present invention employs the following technical solution:

[0005] A coiled tubing radiometric logging assembly includes: a radiation-shielded sub, a rotating sub, and a flexible sub, wherein the radiation-shielded sub, the rotating sub, and the flexible sub are connected in sequence.

[0006] The radiation shielding sub is used to shield against radiation from downhole radioactive sources;

[0007] The rotating section is used to enable a 360-degree rotation between the radiation shielding section and the flexible section;

[0008] The flexible sub section works in conjunction with the rotating sub section to enable the logging instrument to achieve omnidirectional flexible swing downhole.

[0009] Furthermore, the radiation shielding sub includes an externally connected internally threaded female thread, one end of which is connected to a rotating sub, and the other end is connected to a shielding chamber, which is filled with shielding material.

[0010] One end of the shielded chamber is provided with a first sealing element, which is used to seal the shielded chamber. The top of the first sealing element is provided with a threaded plug.

[0011] The other end of the shielded chamber is connected to the hollow chamber via a steel plate partition. The hollow chamber is used to store logging instruments, and the end of the hollow chamber is provided with an external threaded male thread.

[0012] Furthermore, a fixing groove is provided between the outer shell of the shielded chamber and the outer shell of the hollow chamber, and the fixing groove corresponds to the steel plate partition.

[0013] Furthermore, the first sealing element is a rubber sealing ring.

[0014] Furthermore, the rotating section includes an upper outer shell and a lower outer shell, the upper outer shell being connected to the lower outer shell;

[0015] The upper outer shell is screwed with an interlocking bearing chamber, and the lower outer shell is screwed with a ball bearing. The ball bearing is fitted with a second seal and a copper ring on its outer side, and the ball bearing is inserted into the interlocking bearing chamber.

[0016] The other end of the upper housing has an internal threaded female thread, and a flexible short section is connected to the internal threaded female thread.

[0017] Furthermore, the second sealing element is a sheet rubber sealing ring.

[0018] Furthermore, the other end of the lower housing is provided with a first external thread male thread.

[0019] Furthermore, the flexible sub section includes a second external thread male thread and a second internal thread female thread, and the bottom circular hole of the second external thread male thread and the bottom mounting hole of the second internal thread female thread are connected by a rotating support shaft.

[0020] Furthermore, a locking assembly is provided between the second external male thread and the second internal female thread, the locking assembly being used to lock the second external male thread and the second internal female thread together.

[0021] Furthermore, the locking assembly includes a pin lock, which has a pin.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. This assembly includes a radiation shielding sub, a rotating sub, and a flexible sub. The radiation shielding sub provides shielding against radiation from downhole sources during coiled tubing operations involving radioactive baskets, continuously protecting surface personnel from radiation. The rotating sub provides radial torque protection for the basket, preventing instruments and radioactive sources from falling into the well due to basket damage, thus ensuring the safety of radioactive source operations. The flexible sub addresses the risk of pull-out at weak points in existing multi-stage flexible subs, facilitating the connection of male and female threads during coiled tubing installation with the downhole assembly, improving wellhead equipment installation efficiency. Furthermore, the flexible sub, in conjunction with the rotating sub, enables omnidirectional flexible swing of the downhole instrument, enhancing the maneuverability of instruments in large dogleg horizontal wells and significantly increasing the success rate of radioactive logging in horizontal wells.

[0024] 2. The radiation shielding short section is connected to the rotating short section through an external internal threaded female thread, which ensures the stability of the structure and the reliability of the connection. The shielding material filled in the shielding chamber is mainly used to prevent radiation and protect the workers from radiation. The first sealing element seals the shielding chamber to prevent the shielding material from leaking or external impurities from entering.

[0025] 3. The grooves are designed to allow the radiation shielding section to be tightened with a wrench during installation.

[0026] 4. Due to its special annular structure and material properties, the rubber sealing ring can fit tightly against the interface of the shielded chamber, forming a narrow labyrinth gap, effectively preventing lubricating oil leakage and foreign object intrusion, and ensuring the airtightness of the shielded chamber.

[0027] 5. Through the engagement of the interlocking bearing chamber and the ball bearing, the rotating sub achieves flexible and stable rotation, meeting the rotational requirements of operations such as well logging. Secondly, the second seal effectively prevents external impurities and moisture from entering the rotating sub, protecting internal components from damage and ensuring normal equipment operation. The copper ring, acting as external protection for the ball bearing, improves the wear resistance and durability of the rotating sub, extending the equipment's service life.

[0028] 6. Sheet rubber seals have excellent elasticity and adaptability, and can maintain stable sealing performance under different temperature, pressure and vibration conditions.

[0029] 7. Sheet rubber seals can prevent media leakage and contamination, thereby protecting equipment from damage and corrosion.

[0030] 8. By connecting the second external male thread and the second internal female thread through the rotating support shaft, the flexible short section can maintain a stable connection during rotation and bending, effectively preventing leakage and failure caused by loose or broken connections, and improving the stability and reliability of the system. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A schematic diagram of the radiation-proof short section structure in the continuous tubing radioactive logging assembly provided by the present invention;

[0033] Figure 2 A schematic diagram of the rotating short section structure in the continuous tubing radiometric logging assembly provided by the present invention;

[0034] Figure 3 A schematic diagram of the flexible short section structure in the continuous tubing radiometric logging assembly provided by the present invention;

[0035] The components include: 1. Externally connected internally threaded female thread; 2. Plug; 3. First sealing element; 4. Shielding chamber; 5. Fixing groove; 6. Steel plate partition; 7. Hollow chamber; 8. Externally threaded male thread; 801. First externally threaded male thread; 802. Second externally threaded male thread; 9. Internally threaded female thread; 901. Second internally threaded female thread; 10. Upper outer shell; 11. Engagement bearing chamber; 12. Ball bearing; 13. Second sealing element; 14. Copper ring; 15. Lower outer shell; 16. Rotating support shaft; 17. Pin lock. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0041] With the development of cementing quality logging technology for small-diameter horizontal wells and the gradual maturation of coiled tubing transfer technology, coiled tubing skids are typically used to transfer the radioactive cementing quality logging instrument into the well via coiled tubing and connecting it to a connecting section and a fabricated basket. However, during the logging process, due to the limitations of existing coiled tubing transfer technology for radioactive cementing quality logging instruments, firstly, the lack of a radioactive shielding device means that personnel installing wellhead tools on the drilling rig will suffer prolonged radiation damage after the source is loaded; secondly, the lack of a rotation mechanism can cause the instrument and protective basket to break due to excessive radial torque on the coiled tubing, resulting in damage to the instrument and radioactive source falling into the well; finally, the lack of a flexible device leads to two problems: on the one hand, when installing wellhead equipment on the surface, the coiled tubing and downhole tools cannot be vertically aligned, making male and female thread connections difficult and greatly reducing construction efficiency; on the other hand, in horizontal wells with excessively large doglegs, the instrument is prone to obstruction, leading to logging failure.

[0042] To address the aforementioned technical deficiencies, the inventors have provided a coiled tubing radioactive logging assembly, which solves the problems of prolonged radiation exposure for personnel, easy breakage of instruments and baskets, low efficiency of surface installation of wellhead equipment, and low success rate of horizontal well construction with excessively large doglegs when using existing coiled tubing for radioactive logging. This assembly includes a radiation shielding sub that isolates radiation from the radioactive source, a rotating sub that protects the instruments and baskets from breakage by radial torque of the coiled tubing and allows for 360° rotation, and a flexible sub that provides omnidirectional flexible swing, improving instrument passability and reducing obstruction, while also facilitating smooth connection of male and female threads during installation of the coiled tubing and downhole instruments, thus improving the efficiency of wellhead equipment installation.

[0043] The present invention will now be described in further detail with reference to the accompanying drawings:

[0044] This invention provides a continuous tubing radiometric logging assembly, comprising: a radiation shielding sub, a rotating sub, and a flexible sub, which are connected in sequence. The radiation shielding sub is used to shield downhole radioactive sources, the rotating sub is used to enable 360-degree rotation between the radiation shielding sub and the flexible sub, and the flexible sub works in conjunction with the rotating sub to enable the logging instrument to achieve omnidirectional flexible swing downhole. This assembly includes a radiation-shielding sub, a rotating sub, and a flexible sub. The radiation-shielding sub provides shielding against downhole radioactive sources during coiled tubing operations, continuously protecting surface personnel from radiation. The rotating sub provides radial torque protection for the basket, preventing instruments and radioactive sources from falling into the well due to basket damage, thus ensuring the safety of radioactive source operations. The flexible sub addresses the risk of pull-out at weak points in existing multi-stage flexible subs, facilitating the connection of male and female threads during coiled tubing installation with the downhole assembly, improving wellhead equipment installation efficiency. Furthermore, the flexible sub, in conjunction with the rotating sub, enables omnidirectional flexible swing of the downhole instrument, improving the maneuverability of instruments in large dogleg horizontal wells and significantly increasing the success rate of radioactive logging in horizontal wells. Figure 1 As shown, the radiation shielding sub includes an externally threaded female 1, which connects the radiation shielding sub to the rotating sub. The connection ensures structural stability and reliable connection. Specifically, one end of the externally threaded female 1 is connected to the rotating sub, and the other end is connected to a shielding chamber 4. The shielding chamber 4 is filled with shielding material, which is a radioactive shielding material primarily used to prevent radiation and protect workers from radiation exposure. A first sealing element 3 is provided at one end of the shielding chamber 4 to seal it. The first sealing element 3 has the following advantages: A rubber sealing ring was chosen to prevent leakage of the shielding material or the entry of external impurities. A plug 2 is provided at the top of the first sealing element 3 to fix the first sealing element 3. The plug 2 ensures the stable installation of the first sealing element 3, thereby effectively preventing fluid or gas leakage from the sealing part. Secondly, the introduction of the plug 2 makes the installation and removal of the first sealing element 3 more convenient. By twisting the plug 2, the seal can be easily tightened or loosened, greatly saving maintenance time and improving work efficiency. In addition, the tight fit between the plug 2 and the first sealing element 3 can withstand greater pressure and impact, thereby improving the durability of the entire sealing structure. At the other end of the shielded chamber 4, it is connected to the hollow chamber 7 through a steel plate partition 6. The hollow chamber 7 is used to store logging instruments. The end of the hollow chamber 7 is provided with an external thread male thread 8, which is connected to the basket through the external thread male thread 8. Figure 1As shown, a fixing groove 5 is provided between the outer shell of the shielding chamber 4 and the outer shell of the hollow chamber 7. The fixing groove 5 corresponds to the steel plate partition 6. The fixing groove 5 facilitates the tightening of the radiation shielding section with a wrench during installation. Furthermore, the fixing groove 5 allows the radiation shielding section to be directly aligned and inserted during installation, avoiding positional misalignment or displacement. Tightening the radiation shielding section with a wrench through the fixing groove 5 enables quick and accurate installation, greatly improving installation efficiency. Figure 2 As shown, the rotating sub-section includes an upper outer shell 10 and a lower outer shell 15. One end of the upper outer shell 10 is connected to one end of the lower outer shell 15, and the other end of the upper outer shell 10 is connected to an internal threaded female thread 9. The other end of the lower outer shell 15 is connected to a first external threaded male thread 801. A meshing bearing chamber 11 is screwed into the upper outer shell 10, and a ball bearing 12 is screwed into the lower outer shell 15. A second seal 13 and a copper ring 14 are sleeved on the outside of the ball bearing 12. The second seal 13 is preferably a sheet rubber seal ring, which has excellent elasticity and adaptability and can maintain stable sealing performance under different temperature, pressure and vibration conditions. It effectively prevents external impurities, moisture and other substances from entering the rotating sub-section, protects internal parts from damage, and ensures the normal operation of the equipment. The copper ring 14 serves as the ball bearing 12. The external protection improves the wear resistance and durability of the rotating sub, extending the service life of the equipment. The ball bearing 12 is inserted into the interlocking bearing chamber 11. Through the cooperation of the interlocking bearing chamber 11 and the ball bearing 12, the rotating sub can achieve flexible and stable rotation, meeting the rotation function requirements in logging operations. Finally, a flexible sub is connected to the internal thread 9 at the other end of the upper housing 10. The flexible sub solves the risk of easy pull-out at the weak points of existing multi-stage flexible subs, facilitates the connection of male and female threads when installing coiled tubing and downhole assembly instruments, and improves the installation efficiency of wellhead equipment. At the same time, the flexible sub, together with the above-mentioned rotating sub, realizes the all-round flexible swing amplitude of the downhole instrument, improves the passability of large dogleg horizontal well instruments, and greatly improves the success rate of horizontal well radiometric logging. Figure 3 As shown, the flexible sub section includes a second external thread male thread 802 and a second internal thread female thread 901. The bottom circular hole of the second external thread male thread 802 and the bottom mounting hole of the second internal thread female thread 901 are connected by a rotating support shaft 16. A locking assembly is provided between the second external thread male thread 802 and the second internal thread female thread 901 to lock the second external thread male thread 802 and the second internal thread female thread 901. Specifically, the locking assembly includes a pin lock 17, which is disposed on the second external thread male thread 802 or the second internal thread female thread 901 and has a pin.

[0045] In specific operations, the installation of the radiation shielding sub begins by solidly filling the shielding chamber 4 with radioactive shielding material. Then, the first sealing element 3 is installed onto the plug 2, and the plug 2 is installed at the upper opening of the shielding chamber 4 to seal the radioactive shielding material. The lower part of the external internal threaded female thread 1 is tightened and fixed to the outer shell of the shielding chamber 4. The shielding chamber 4 is separated from the hollow chamber 7 by the steel plate partition 6. After storing the radioactive cementing quality logging instrument in the hollow chamber 7, it is tightened and fixed to the existing basket using the external threaded male thread 8. The installation of the rotating sub begins by connecting and fixing the upper outer shell 10 to the interlocking bearing chamber 11 with threads, and connecting and fixing the lower outer shell 15 to the ball bearing 12 with threads. Then, the second sealing element 13 and the copper ring 14 are passed through the ball bearing 12. Finally, the ball bearing 12 is inserted into the interlocking bearing chamber 11, and the fixing screws are tightened to complete the connection and fixation between the upper outer shell 10 and the lower outer shell 15. The installation of the flexible section begins by aligning the bottom circular hole of the second external thread male thread 802 with the circular hole on the rotating support shaft 16, tightening it with threaded bolts, and then inserting a pin 17 to lock it in place. Tightening the pins secures the threaded bolts. The insertion of the pins and the locking of the threaded bolts further enhance the stability of the connection, enabling the flexible section to withstand greater forces and torques, ensuring stability and reliability under complex working conditions. The mounting hole of the second internal thread female thread 901 is then connected to the rotating support shaft 16 in the same manner, completing the assembly of the entire flexible section. The number of flexible sections can be adjusted according to actual operational needs and is not limited thereto; in this embodiment, two flexible sections are used.

[0046] Finally, the entire assembly of the combined tool is performed. The radioactive cementing quality logging instrument is placed in the existing basket. The male external thread 8 of the radiation shielding sub is tightened and fixed to the female thread of the existing basket, completing the assembly between the radiation shielding sub and the basket. The female external thread 1 of the radiation shielding sub is tightened and fixed to the first male external thread 801 of the rotating sub, completing the assembly between the rotating sub and the radiation shielding sub. The male external thread 802 of the flexible sub is then tightened and fixed to the female internal thread 9 of the rotating sub, completing the assembly between the flexible sub and the rotating sub. Finally, the female internal thread 901 of the flexible sub is tightened and fixed to the male thread of the bottom of the coiled tubing, thus completing the assembly and installation of the entire combined tool and coiled tubing.

[0047] In horizontal well logging operations, the radioactive cementing quality logging instruments within the radiation-shielded sub are securely protected within the structure, providing radiation protection for personnel on the surface. The rotating sub, through its rotational function, eliminates the radial torque from the coiled tubing, thus protecting the instruments and basket. The flexible sub, through the flexible swing of two rotating support shafts 16, improves the passability of horizontal well logging instruments, reducing the probability of instrument obstruction. Simultaneously, the flexible design improves the efficiency of docking and installing the coiled tubing and radioactive logging basket assembly tools, reducing labor intensity. In summary, this assembly includes a radiation shielding sub, a rotating sub, and a flexible sub. The radiation shielding sub connects to the rotating sub via an externally threaded female connector 1, ensuring structural stability and connection reliability. During coiled tubing operations involving the delivery of radioactive baskets, the radiation shielding sub provides shielding against downhole radiation sources, continuously protecting surface personnel from radiation. The rotating sub provides radial torque protection for the basket, preventing instruments and the radioactive source from falling into the well due to basket damage, thus ensuring the safety of radioactive source operations. The flexible sub addresses the risk of pull-out at weak points in existing multi-stage flexible subs, facilitating the connection of male and female connectors during coiled tubing and downhole assembly installation, improving wellhead equipment installation efficiency. Furthermore, the flexible sub, in conjunction with the rotating sub, enables omnidirectional flexible swing of the downhole instrument, improving the passability of instruments in large dogleg horizontal wells and significantly increasing the success rate of radioactive logging in horizontal wells.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit its scope of protection. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading the present invention, they can still make various changes, modifications or equivalent substitutions to the specific implementation of the invention, but these changes, modifications or equivalent substitutions are all within the scope of protection of the pending claims of the invention.

Claims

1. A coiled tubing radioactive logging assembly characterized by, The utility model relates to a kind of well logging instrument, including: radiation-proof short section, rotating short section and flexible short section, which are connected in turn;The radiation-proof short section is used to shield the ray of downhole radioactive source;The rotating short section is used to realize 360 degrees rotation between the radiation-proof short section and flexible short section;The flexible short section cooperates with rotating short section, and is used to realize full-range flexible swing of well logging instrument downhole. The radiation-proof short section includes external thread female coupling (1), one end of the external thread female coupling (1) is connected with rotating short section, the other end is connected with shielding warehouse (4), the shielding warehouse (4) is filled with shielding material; The shielding warehouse (4) is provided with first sealing element (3) at one end, the first sealing element (3) is used to seal shielding warehouse (4), the top of the first sealing element (3) is provided with plug (2); The other end of the shielding warehouse (4) is connected with hollow warehouse (7) by steel plate partition (6), the hollow warehouse (7) is used to store well logging instrument, the end of the hollow warehouse (7) is provided with external thread male coupling (8). The shell of the shielding warehouse (4) and the shell of the hollow warehouse (7) are provided with fixed groove (5), the fixed groove (5) corresponds to the steel plate partition (6).

2. The apparatus of claim 1, wherein, The first sealing element (3) is rubber sealing ring. The rotating short section includes upper shell (10) and lower shell (15), the upper shell (10) is connected with the lower shell (15); The upper shell (10) is screwed with occlusal bearing warehouse (11), the lower shell (15) is screwed with ball bearing (12), the outer side of the ball bearing (12) is provided with second sealing element (13) and copper ring (14), the ball bearing (12) is inserted in the occlusal bearing warehouse (11); 3. The apparatus of claim 2, wherein, The other end of the upper shell (10) is screwed with female coupling (9), the female coupling (9) is connected with flexible short section.

4. The apparatus of claim 2, wherein, The second sealing element (13) is sheet rubber sealing ring.

5. The apparatus of claim 2, wherein, The other end of the lower shell (15) is provided with first external thread male coupling (801). The flexible short section includes second external thread male coupling (802) and second female coupling (901), the bottom hole of the second external thread male coupling (802) and the bottom mounting hole of the second female coupling (901) are connected by rotating support shaft (16). Locking assembly is arranged between the second external thread male coupling (802) and the second female coupling (901), and is used to lock the second external thread male coupling (802) and the second female coupling (901).

6. The apparatus of claim 5, wherein, The locking assembly includes pin lock (17), and the pin lock is provided with pin.

7. The apparatus of claim 5, wherein, ​ 8. The apparatus of claim 5, wherein, ​ 9. The apparatus of claim 8, wherein, ​ 10. The apparatus of claim 9, wherein, ​

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