Logging-while-drilling tool anti-falling damping centralizing device and using method

Abstract

The invention relates to the technical field of centralizers, in particular to a logging-while-drilling tool anti-disengaging damping centralizing device and a using method, the logging-while-drilling tool anti-disengaging damping centralizing device comprises at least two centralizing damping short sections, and each centralizing damping short section comprises an outer sleeve, a centralizing damping part and a fastening adjusting part. The fishing device is reasonable and compact in structure and convenient to use, the logging-while-drilling instrument string can be fixedly installed in the middle of the inner side of the centralizing and damping short section through the centralizing and damping part, the fastening and adjusting part and the stop part, and when underground complexity and drilling tool jamming occur, the fishing device and the upper end of the logging-while-drilling instrument string are clamped and fixed together, and the centralizing and damping short section is fixed to the centralizing and damping short section. When a well logging while drilling instrument string is fished out of a well, the well logging while drilling instrument string can be separated from the centralizing and damping part by dragging the fisher upwards, penetrates through the inner side of a small water hole of the accident handling tool upwards and is fished out of the well quickly, and then underground complex and drill jamming accidents are handled through the accident handling tool, so that the fishing operation efficiency of the well logging while drilling instrument string is effectively improved; and the logging while drilling instrument string is prevented from being buried underground to cause heavy property loss.

Description

Technical Field

[0001] The invention relates to the technical field of centralizers, and is a device for preventing and damping a centralizer for a logging while drilling tool and a use method thereof. Background Art

[0002] Measurement While Drilling (MWD) generally refers to the measurement of drilling engineering parameters, such as well inclination, azimuth and tool face. Due to the different natural radioactivity intensities of different formation lithologies, the formation lithology can be determined by measuring the gamma intensity emitted by the formation rock during drilling. Therefore, the gamma meter and the MWD instrument (also known as the logging while drilling instrument, the same below) can be used together to adjust and control the wellbore trajectory in time according to the measured well inclination, azimuth, etc. In addition to identifying lithology, the gamma meter can also better guide the logging while drilling instrument, and control the drill bit to pass through the best position of the oil layer according to the geological information obtained from the measurement, thereby ensuring that the drill bit always "passes through" the oil layer, effectively identifying the reservoir boundary, facilitating the development of thin oil layers, and improving the drilling rate of horizontal wells.

[0003] The logging while drilling instrument has high technical content, complex structure and high price. In order to ensure the measurement accuracy during use, the logging while drilling instrument needs to be suspended in the middle of the drill collar channel at all times. In order to center it, a radial straightening and shock absorbing device is usually set on the outer wall of the logging while drilling instrument. The outer diameter of the radial straightening and shock absorbing device is generally larger than the inner diameter of the small water hole in the accident handling tool (drilling jar, buckle joint, plugging joint). Once a complex and stuck drill occurs downhole, it is difficult for the radial straightening and shock absorbing device to pass through the small water hole smoothly, resulting in the failure to successfully salvage the logging while drilling instrument, causing the instrument to be buried underground and causing heavy losses. If the outside of the logging while drilling instrument does not carry a radial straightening and shock absorbing device, it will be easy to salvage, but it is difficult to ensure that the instrument is straightened and centered, which will affect its measurement accuracy, and it cannot effectively absorb and eliminate various complex vibrations of the drilling tool, which will cause damage to the instrument. In addition, the exciting pressure and inertia generated by the too fast drilling speed, as well as the pressure difference between the inside and outside of the drill bit annulus caused by the failure to fill the drill bit with mud in time, can also cause the LWD tool to slip out of the circulating casing and cause debonding.

[0004] Therefore, the radial stabilizing and damping device used in the existing logging while drilling instrument has the following deficiencies in actual use: if the logging while drilling instrument and the accident handling tool are used at the same time, once a complex accident or pipe jam occurs in the well, the logging while drilling instrument cannot be salvaged, resulting in a significant loss of the instrument being buried in the well; if the logging while drilling instrument is not equipped with an accident handling tool, it cannot handle complex accidents and pipe jam in the well; if the accident handling tool is provided but the logging while drilling instrument is not provided, it cannot effectively control the wellbore trajectory and ensure that the drill bit passes through the optimal position in the oil layer; it is easy to debond (especially in horizontal wells), resulting in frequent tripping and drilling operations, which seriously affects the efficiency of drilling operations and easily causes underground safety risks. Summary of the invention

[0005] The present invention provides a device for preventing and absorbing shocks from falling off and a method for using the device for logging while drilling, which overcomes the deficiencies of the prior art and can effectively solve the problems of complicated downhole operation and difficulty in salvaging when the drill bit is stuck, which exist in the radial absorbing and centering device used in the prior logging while drilling instrument.

[0006] One of the technical solutions of the present invention is achieved through the following measures: a device for preventing and damping the vertical axis of a logging while drilling instrument, comprising at least two sections of vertical axis and shock absorbing short sections, the vertical axis and shock absorbing short sections comprising an outer sleeve, a vertical axis and shock absorbing part and a fastening and adjusting part, an upper vertical axis and a lower vertical axis inner ring groove are respectively arranged on the inner sides of the upper and lower parts of the outer sleeve, a vertical axis and a shock absorbing part which can be mounted on the outer side of a logging while drilling instrument string are both arranged on the inner sides of the lower parts of the upper vertical axis and the upper parts of the lower vertical axis inner ring groove, and a fastening and adjusting part which can enable the corresponding vertical axis and shock absorbing part to tightly hold the logging while drilling instrument string are both arranged on the inner sides of the middle parts of the upper vertical axis and the middle parts of the lower vertical axis inner ring groove; two adjacent vertical axis and shock absorbing short sections can be detachably installed together.

[0007] The following are further optimizations and / or improvements to the above technical solutions: The uppermost section of the righting and damping short section may also include a stopper, and the inner side of the fastening and adjusting part of the uppermost section of the righting and damping short section is provided with a stopper that can prevent the while drilling logging instrument string from moving, and the stopper can be reset under the action of external force.

[0008] The above-mentioned stop part can be a spring sheet, and at least one stop installation groove with an opening facing inward and passing through from top to bottom is evenly distributed along the circumference inside the fastening adjustment part. A spring sheet with a free lower end is fixedly installed on the inner side of the upper end of each stop installation groove, and the middle part of each spring sheet is bent inward to form a triangular protrusion.

[0009] The above-mentioned straightening and shock-absorbing part may include an elastic sleeve and elastic ribs. The outer side of the elastic sleeve is assembled together with the inner side of the lower part of the upper straightening inner ring groove. At least two elastic ribs are evenly distributed along the circumference of the inner side of the elastic sleeve. The upper inner side and the lower inner side of all the elastic ribs are provided with guide chamfers.

[0010] The above-mentioned fastening adjustment part can be an adjustment pressure ring, the outer side of the adjustment pressure ring is connected with the inner side of the upper and lower straightening inner ring grooves corresponding thereto through threads, and each adjustment pressure ring has at least two wrench slots evenly distributed along the circumference at one end away from the straightening and shock absorbing part.

[0011] The inner side of the upper end of the outer sleeve may be provided with an inner connecting groove, the bottom of which is provided with an inner thread, and the outer side of the lower end of the outer sleeve may be provided with an outer connecting groove, the bottom of which is provided with an outer thread.

[0012] The second technical solution of the present invention is achieved through the following measures: a method for using an anti-dropout shock-absorbing and straightening device for a logging while drilling instrument, which is carried out according to the following method: the first step is to set a stop groove matching the inner end of the stop part on the outer side of the upper end of the logging while drilling instrument string; the second step is to determine the number of straightening and shock-absorbing short sections required according to the length of the logging while drilling instrument string; the third step is to pass the logging while drilling instrument string through the inner sides of all the straightening and shock-absorbing short sections from bottom to top in sequence, and when the inner end of the stop part is aligned with the stop groove up and down, rotate the uppermost straightening and shock-absorbing short section to make the inner end of the stop part and the stop groove snap together; the fourth step is to first adjust all the fastening and adjustment parts in the uppermost straightening and shock-absorbing short section so that the corresponding straightening and shock-absorbing parts hold the logging while drilling instrument string tightly, and then adjust the fastening and adjustment part at the upper position in the next upper straightening and shock-absorbing short section so that the corresponding straightening and shock-absorbing part can hold the logging while drilling instrument string but does not affect the straightening and shock-absorbing part of this section The positive shock-absorbing short section moves up and down, and then the next upper section of the righting shock-absorbing short section and the uppermost section of the righting shock-absorbing short section are fixedly installed together, and then the fastening adjustment part at the lower position inside the next upper section of the righting shock-absorbing short section is adjusted to make the corresponding righting shock-absorbing part hold the logging while drilling instrument string tightly, and according to the adjustment and installation method of the next upper section of the righting shock-absorbing short section, the remaining righting shock-absorbing short sections and the next upper section of the righting shock-absorbing short section are fixedly installed; the fifth step is to install the device and the accident handling tool on the drilling tool at the same time and lower them into the well. If the well is complicated and the drill is stuck, the salvage device is lowered from the wellhead to make the salvage device and the upper end of the logging while drilling instrument string be clamped and fixed together, and the logging while drilling instrument string is dragged upward. The stopper is squeezed by the outer wall of the logging while drilling instrument string and automatically resets, and the lock of the stopper and the logging while drilling instrument string is released, so that the logging while drilling instrument string can pass through the small water hole in the accident handling tool string upward and be salvaged out of the well.

[0013] The present invention has a reasonable and compact structure and is easy to use. The present invention, the drilling tool and the accident handling tool can be lowered into the well at the same time. During normal drilling operations, the logging while drilling instrument string can be suspended in the middle of the inner side of the outer casing through a plurality of centralizing and shock absorbing parts mounted on the outer side of the logging while drilling instrument string, thereby effectively controlling the wellbore trajectory and ensuring that the drill bit travels through the oil layer at the best position. By adjusting the fastening and adjusting parts, the corresponding centralizing and shock absorbing parts can be made to tightly hold the logging while drilling instrument string, thereby effectively preventing the logging while drilling instrument string from moving up and down and being damaged by various complex vibrations of the drilling tool, thereby affecting the measurement accuracy. The stopper can effectively prevent the logging while drilling instrument string from moving up and down and being damaged by various complex vibrations of the drilling tool, thereby effectively preventing the logging while drilling instrument string from moving up and down and being damaged by various complex vibrations of the drilling tool, thereby affecting the measurement accuracy. The logging instrument string can rotate radially and move up and down, and can also achieve double locking together with the uprighting and shock-absorbing part, effectively avoiding the phenomenon of the logging instrument string being debonded; when downhole complexities and pipe sticking occur, the fishing device is clamped and fixed to the upper end of the logging instrument string, and then the fishing device is dragged upward to separate the logging instrument string from the uprighting and shock-absorbing short section, and the logging instrument string passes upward through the inside of the small water hole of the accident handling tool and is quickly salvaged out of the well. Afterwards, the accident handling tool is used to handle downhole complexities and pipe sticking accidents, thereby effectively improving the efficiency of the salvage operation of the logging instrument string and avoiding the logging instrument string being buried underground and causing major property losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1 It is a schematic diagram of the front cross-sectional structure of embodiments 1-7 of the present invention.

[0015] Attached Figure 2 It is a schematic diagram of the reduced front cross-sectional structure of the embodiment 1-7 of the present invention in the use state.

[0016] Attached Figure 3 For attachment Figure 1 Schematic diagram of the three-dimensional structure of the connection between the central straightening and shock absorbing part, the fastening and adjusting part and the stop part.

[0017] The codes in the accompanying drawings are: 1 is the outer sleeve, 2 is the upper straightening inner ring groove, 3 is the lower straightening inner ring groove, 4 is the spring sheet, 5 is the stop mounting groove, 6 is the triangular protrusion, 7 is the elastic sleeve, 8 is the elastic rib plate, 9 is the guide chamfer, 10 is the adjusting pressure ring, 11 is the wrench slot, 12 is the connecting inner ring groove, 13 is the connecting outer ring groove, 14 is the stop screw, 15 is the drill tool connecting female buckle, and 16 is the drill tool connecting male buckle. DETAILED DESCRIPTION

[0018] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0019] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0020] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As attached Figure 1-3 As shown, the anti-dropout shock-absorbing and righting device of the logging while drilling instrument comprises at least two righting and shock-absorbing short sections, the righting and shock-absorbing short sections comprising an outer sleeve 1, a righting and shock-absorbing part and a fastening and adjusting part, the upper inner side and the lower inner side of the outer sleeve 1 are respectively provided with an upper righting inner ring groove 2 and a lower righting inner ring groove 3, the lower inner side of the upper righting inner ring groove 2 and the upper inner side of the lower righting inner ring groove 3 are both provided with righting and shock-absorbing parts that can be mounted on the outer side of the logging while drilling instrument string, the middle inner side of the upper righting inner ring groove 2 and the middle inner side of the lower righting inner ring groove 3 are both provided with fastening and adjusting parts that can enable the corresponding righting and shock-absorbing parts to tightly hold the logging while drilling instrument string; two adjacent righting and shock-absorbing short sections can be detachably installed together.

[0021] During use, the number of righting and shock-absorbing short sections can be selected according to the length of the logging while drilling instrument string in the prior art. In this way, when the logging while drilling instrument string is long, it is more convenient to install it in sections and the righting and shock-absorbing effect is better. In this embodiment, the number of righting and shock-absorbing short sections can be two, and the two righting and shock-absorbing short sections can be connected by detachable installation methods such as screw connection, clamping connection or threaded fastener connection in the prior art; through multiple righting and shock-absorbing parts mounted on the outside of the logging while drilling instrument string, it is ensured that the logging while drilling instrument string is always suspended in the middle of the inner side of the outer casing 1, which can better play the role of righting, centering and shock-absorbing, and avoid it being damaged by various complex vibrations of the drill tool during the drilling operation, affecting the measurement accuracy; the tightening and adjusting part can make the righting and shock-absorbing part produce elastic deformation, so that the righting and shock-absorbing part can hold the logging while drilling instrument string tightly to prevent the logging while drilling instrument string from moving up and down during the drilling operation.

[0022] According to the requirements, the straightening and shock absorbing part can be realized by a spring or spring sheet 4 or an elastic material wing or an elastic material tube (such as a rubber tube or a flexible polyurethane tube, etc.) arranged radially along the outer sleeve 1 in the prior art; the fastening and adjustment part can be realized by a threaded pressure ring or a conical pressure ring or an interference pressure ring in the prior art, or a plurality of through holes can be set on the straightening and shock absorbing part, and it can be realized by a pressure ring sheet and a screw connected to the outer sleeve 1 through the through holes; to facilitate the disassembly of the present invention and the drill tool, the inner side of the upper end of the uppermost section of the outer sleeve 1 and the outer side of the lower end of the lowermost section of the outer sleeve 1 are provided with a drill tool thread compatible with the drill tool; the outer sleeve 1 can be realized by a low-carbon, high-chromium, manganese alloy steel pipe with low magnetic permeability and high-strength mechanical properties in the prior art.

[0023] The present invention has a reasonable and compact structure and is easy to use. The present invention, the drilling tool and the accident handling tool can be lowered into the well at the same time. During normal drilling operations, the logging while drilling instrument string can be suspended in the middle of the inner side of the outer casing 1 through a plurality of centralizing and shock absorbing parts mounted on the outer side of the logging while drilling instrument string, thereby effectively controlling the wellbore trajectory and ensuring that the drill bit travels in the best position of the oil layer. By adjusting the fastening and adjusting parts, the corresponding centralizing and shock absorbing parts can be tightly held on the logging while drilling instrument string, thereby effectively preventing the logging while drilling instrument string from moving up and down and radially. and various complex vibrations of the drill string, affecting the measurement accuracy; when downhole complex accidents and pipe sticking occur, the salvage device is clamped and fixed to the upper end of the logging while drilling instrument string, and the logging while drilling instrument string can be separated from the straightening and shock absorbing part by dragging the salvage device upward, and then passed through the inside of the small water hole of the accident handling tool, and was quickly salvaged out of the well. Afterwards, the downhole complex accidents and pipe sticking accidents are handled by the accident handling tool, thereby effectively improving the efficiency of the salvage operation of the logging while drilling instrument string and avoiding the logging while drilling instrument string being buried underground and causing major property losses.

[0024] According to actual needs, the above-mentioned anti-dropping and shock-absorbing and straightening device of the logging while drilling tool can be further optimized and / or improved: Embodiment 2: As attached Figure 1-3 As shown, the uppermost section of the straightening and damping short section also includes a stopper, and the inner side of the fastening and adjusting part of the uppermost section of the straightening and damping short section is provided with a stopper that can prevent the while drilling logging instrument string from moving, and the stopper can be reset under the action of external force.

[0025] Through such an arrangement, the stopper and the straightening and shock-absorbing part that can produce elastic deformation and hold the logging while drilling instrument string tightly can achieve double locking of the logging while drilling instrument string, effectively preventing the logging while drilling instrument string from moving axially, radially or circumferentially in the outer casing 1, effectively preventing the occurrence of debonding, thereby avoiding frequent drilling operations, effectively improving drilling operation efficiency and reducing downhole safety risks.

[0026] According to the requirements, the stop part can be realized by a spring pin or a spring plunger or a spring card in the prior art which can automatically reset under the action of external force. In order to better connect and fix the stop part to the logging while drilling instrument string, a card slot corresponding to the position of the stop part can be provided on the logging while drilling instrument string for facilitating the connection and unlocking with the stop part.

[0027] Embodiment 3: As attached Figure 1-3 As shown, the stop portion is a spring sheet 4, and at least one stop installation groove 5 with an opening facing inward and passing through from top to bottom is evenly distributed along the circumference of the fastening adjustment portion. A spring sheet 4 with a free end at the lower end is fixedly installed on the inner side of the upper end of each stop installation groove 5, and the middle part of each spring sheet 4 is bent inward to form a triangular protrusion 6.

[0028] During use, a card slot can be firstly provided on the outer side of the logging while drilling instrument string corresponding to the middle position of one of the spring sheets 4. After installation, the triangular protrusion 6 in the middle of the spring sheet 4 is carded together with the card slot, which can effectively prevent the rotation and key-off phenomenon of the logging while drilling instrument string. In addition, multiple spring sheets 4 cooperate with one card slot, which can effectively reduce the rotation adjustment angle between the logging while drilling instrument string and the straightening and shock-absorbing short joint, and improve the assembly efficiency. Since the lower end of the spring sheet 4 is not fixed (free end), when it needs to be unlocked and reset, the lower end of the salvage device can be squeezed by its own weight to squeeze the upper side of the triangular protrusion 6, so that the triangular protrusion 6 is pressed downward and stretched along the stop installation groove 5 (that is, the triangular protrusion 6 is contracted outward by external force), and is released from the card slot to realize unlocking. In the process of dragging the logging while drilling instrument string upward, the lower side of the triangular protrusion 6 can also be squeezed by the lower side wall of the card slot to stretch it in the stop installation groove 5 and unlock it.

[0029] According to requirements, the upper end of the spring sheet 4 and the fastening adjustment part can be fixedly installed by non-detachable installation methods such as welding, bonding or riveting in the prior art, or can be detachably fixedly installed by threaded fasteners in the prior art; the triangular protrusion 6 in the middle of the spring sheet 4 can also be an arc-shaped protrusion.

[0030] Embodiment 4: As attached Figure 1-3 As shown, the straightening and shock absorbing part includes an elastic sleeve 7 and an elastic rib 8. The outer side of the elastic sleeve 7 is assembled together with the inner side of the lower part of the upper straightening inner ring groove 2. At least two elastic ribs 8 are evenly distributed along the circumference of the inner side of the elastic sleeve 7. The inner sides of the upper ends and lower ends of all the elastic ribs 8 are provided with guide chamfers 9.

[0031] By setting it in this way, the elastic sleeve 7 and the elastic rib 8 can have a larger deformation space, and the holding and shock absorption effect is better; the elastic rib 8 can also reduce the friction between the elastic sleeve 7 and the outer side of the logging while drilling instrument string, and cooperate with the guide chamfer 9 to facilitate the installation and separation between the straightening and shock absorbing part and the logging while drilling instrument string. According to the requirements, in order to obtain better straightening and centering performance, four elastic ribs 8 are evenly distributed along the circumference of the inner side of the elastic sleeve 7 in this embodiment. The elastic rib 8 and the elastic sleeve 7 are erosion-resistant, corrosion-resistant and highly elastic rubber sleeves and rubber ribs, which can be integrally formed by a mold, and the guide chamfer 9 can form a 60° chamfer of the guide bell mouth.

[0032] Embodiment 5: As attached Figure 1-3 As shown, the fastening adjustment part is an adjusting pressure ring 10, the outer side of the adjusting pressure ring 10 is connected with the inner side of the upper straightening inner ring groove 2 and the inner side of the lower straightening inner ring groove 3 corresponding to it through threads, and each adjusting pressure ring 10 has at least two wrench slots 11 evenly distributed along the circumference at one end away from the straightening and shock absorbing part.

[0033] During use, the pressing ring 10 can be adjusted by rotating the adjusting ring forward / reverse with a wrench to adjust the degree of compression between the centralizing and shock absorbing part, thereby changing the degree of clamping between the centralizing and shock absorbing part and the outer side of the logging while drilling instrument string, ensuring that during normal drilling operations, the logging while drilling instrument string can be reliably centralized and shock-absorbing by the centralizing and shock absorbing part, and when downhole complexities and drill bit jams occur, the logging while drilling instrument string can be dragged out of the centralizing and shock absorbing short joint together with the salvage device and salvaged out of the well.

[0034] Embodiment 6: As attached Figure 1-2 As shown, a connecting inner ring groove 12 is provided on the inner side of the upper end of the outer sleeve 1, and an internal thread is provided at the bottom of the connecting inner ring groove 12; a connecting outer ring groove 13 is provided on the outer side of the lower end of the outer sleeve 1, and an external thread is provided at the bottom of the connecting outer ring groove 13.

[0035] Through such an arrangement, the two adjacent straightening and shock-absorbing short-sections can be disassembled, assembled and fixed more quickly. In order to prevent the two from vibrating and loosening, a stop screw 14 can be set at the connection between the two. The connecting inner ring groove 12 at the upper end of the uppermost outer sleeve 1 and the connecting outer ring groove 13 at the lower end of the lowermost outer sleeve 1 can be provided with a drill tool connecting female buckle 15 and a drill tool connecting male buckle 16 that are compatible with the drill tool.

[0036] Embodiment 7: As attached Figure 1-3As shown, the method for using the anti-dropping and shock-absorbing and straightening device for the logging while drilling instrument is carried out according to the following method. The first step is to set a stopping groove matching the inner end of the stopping part on the outer side of the upper end of the logging while drilling instrument string; the second step is to determine the number of straightening and shock-absorbing short sections required according to the length of the logging while drilling instrument string; the third step is to pass the logging while drilling instrument string through the inner sides of all the straightening and shock-absorbing short sections from bottom to top in sequence, and when the inner end of the stopping part is aligned with the stopping groove up and down, rotate the uppermost straightening and shock-absorbing short section to make the inner end of the stopping part and the stopping groove snap together; the fourth step is to first adjust all the fastening and adjusting parts in the uppermost straightening and shock-absorbing short section so that the corresponding straightening and shock-absorbing parts hold the logging while drilling instrument string tightly, and then adjust the fastening and adjusting part at the upper position in the next upper straightening and shock-absorbing short section so that the corresponding straightening and shock-absorbing part can hold the logging while drilling instrument string but does not affect the up and down movement of the straightening and shock-absorbing short section of this section , then fix and install the next previous section of the righting and shock-absorbing short section with the uppermost section of the righting and shock-absorbing short section together, and then adjust the fastening adjustment part at the lower position of the next previous section of the righting and shock-absorbing short section so that the corresponding righting and shock-absorbing part holds the logging while drilling instrument string tightly, and complete the fixed installation of the remaining righting and shock-absorbing short sections and the next previous section of the righting and shock-absorbing short section according to the adjustment and installation method of the next previous section of the righting and shock-absorbing short section; the fifth step is to install the device and the accident handling tool on the drilling tool at the same time and lower them into the well. If the well is complicated and the pipe is stuck, lower the salvage device from the wellhead to make the salvage device and the upper end of the logging while drilling instrument string be clamped and fixed together, and drag the logging while drilling instrument string upward. The stopper will be squeezed by the outer wall of the logging while drilling instrument string and will automatically reset, so that the lock between the stopper and the logging while drilling instrument string is released, so that the logging while drilling instrument string can pass through the small water hole in the accident handling tool string upward and be salvaged out of the well.

[0037] By such arrangement, during normal drilling operation, the logging while drilling instrument string can be securely fixed by the straightening and damping part, the tightening and adjusting part and the stop part in the middle of the inner side of the outer casing 1 to prevent movement and thus avoid the phenomenon of key separation. The straightening and centering ensures the measurement accuracy so that the drill bit can pass through the best position of the oil layer, and absorbs various complex vibrations generated by the drilling tool to avoid damage to the logging while drilling instrument string. When underground complex and drill stuck occur, the logging while drilling instrument string can be quickly dragged out of the present invention and salvaged out of the well to avoid instrument loss, and it is also convenient to continue to deal with underground complex and drill stuck accidents through accident handling tools.

[0038] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A device for preventing and relieving vibrations of a logging while drilling tool, characterized in that The invention comprises at least two sections of righting and shock-absorbing short sections, which comprise an outer sleeve, a righting and shock-absorbing part and a fastening and adjusting part. An upper righting inner ring groove and a lower righting inner ring groove are respectively arranged on the inner sides of the upper and lower parts of the outer sleeve. A righting and shock-absorbing part which can be mounted on the outer side of a logging while drilling instrument string is arranged on the inner sides of the lower part of the upper righting inner ring groove and the upper part of the lower righting inner ring groove. A fastening and adjusting part which can enable the corresponding righting and shock-absorbing part to tightly hold the logging while drilling instrument string is arranged on the inner sides of the middle parts of the upper righting inner ring groove and the middle parts of the lower righting inner ring groove. Two adjacent righting and shock-absorbing short sections can be detachably installed together.

2. The anti-dropping and shock-absorbing and straightening device for logging while drilling tool according to claim 1 is characterized in that The uppermost section of the righting and damping short section also includes a stopper, and the inner side of the fastening and adjusting part of the uppermost section of the righting and damping short section is provided with a stopper that can prevent the string of the logging while drilling instrument from moving, and the stopper can be reset under the action of external force.

3. The anti-dropping and shock-absorbing and straightening device for logging while drilling tool according to claim 2 is characterized in that The stopping part is a spring sheet, and at least one stopping installation groove with an opening facing inward and passing through from top to bottom is evenly distributed along the circumference of the fastening adjustment part. A spring sheet with a free lower end is fixedly installed on the inner side of the upper end of each stopping installation groove, and the middle part of each spring sheet is bent inward to form a triangular protrusion.

4. The anti-dropping, shock-absorbing and straightening device for logging while drilling tools according to claim 1, 2 or 3, characterized in that The straightening and shock absorbing part includes an elastic sleeve and an elastic rib. The outer side of the elastic sleeve is assembled with the inner side of the lower part of the upper straightening inner ring groove. At least two elastic ribs are evenly distributed along the circumference of the inner side of the elastic sleeve. The inner sides of the upper and lower ends of all the elastic ribs are provided with guide chamfers.

5. The anti-dropping, shock-absorbing and straightening device for logging while drilling tools according to claim 1, 2 or 3, characterized in that The tightening adjustment part is an adjusting pressure ring, and the outer side of the adjusting pressure ring is connected with the inner side of the upper and lower inner ring grooves corresponding to the adjusting pressure ring through threads. Each adjusting pressure ring has at least two wrench slots evenly distributed along the circumference at one end away from the centralizing and shock absorbing part.

6. The anti-dropping and shock-absorbing and straightening device for logging while drilling tool according to claim 4 is characterized in that The tightening adjustment part is an adjusting pressure ring, and the outer side of the adjusting pressure ring is connected with the inner side of the upper and lower inner ring grooves corresponding to the adjusting pressure ring through threads. Each adjusting pressure ring has at least two wrench slots evenly distributed along the circumference at one end away from the centralizing and shock absorbing part.

7. The anti-dropping, shock-absorbing and straightening device for logging while drilling tools according to claim 1, 2, 3 or 6, characterized in that An inner connecting groove is provided on the inner side of the upper end of the outer sleeve, and an inner thread is provided on the bottom of the connecting inner groove; an outer connecting groove is provided on the outer side of the lower end of the outer sleeve, and an outer thread is provided on the bottom of the connecting outer groove.

8. The anti-dropping and shock-absorbing and straightening device for logging while drilling tool according to claim 4 is characterized in that An inner connecting groove is provided on the inner side of the upper end of the outer sleeve, and an inner thread is provided on the bottom of the connecting inner groove; an outer connecting groove is provided on the outer side of the lower end of the outer sleeve, and an outer thread is provided on the bottom of the connecting outer groove.

9. The anti-dropping, shock-absorbing and straightening device for logging while drilling tool according to claim 5, characterized in that An inner connecting groove is provided on the inner side of the upper end of the outer sleeve, and an inner thread is provided on the bottom of the connecting inner groove; an outer connecting groove is provided on the outer side of the lower end of the outer sleeve, and an outer thread is provided on the bottom of the connecting outer groove.

10. A method for using the anti-dropping and shock-absorbing and straightening device for a logging while drilling tool according to any one of claims 2 to 9, characterized in that The method is as follows: the first step is to set a stop groove matching the inner end of the stop part on the outer side of the upper end of the logging while drilling instrument string; the second step is to determine the number of sections of the required righting and shock-absorbing short sections according to the length of the logging while drilling instrument string; the third step is to pass the logging while drilling instrument string through the inner sides of all the righting and shock-absorbing short sections from bottom to top in sequence, and when the inner end of the stop part is aligned with the stop groove up and down, rotate the uppermost righting and shock-absorbing short section to make the inner end of the stop part and the stop groove snap together; the fourth step is to first adjust all the fastening and adjusting parts in the uppermost righting and shock-absorbing short section so that the corresponding righting and shock-absorbing parts hold the logging while drilling instrument string tightly, and then adjust the fastening and adjusting parts at the upper position in the next upper righting and shock-absorbing short section so that the corresponding righting and shock-absorbing parts can hold the logging while drilling instrument string but do not affect the up and down movement of the current righting and shock-absorbing short section, and then The fifth step is to install the device and the accident handling tool on the drilling tool at the same time and lower them into the well. If the well is complicated and the drill is stuck, lower the salvage device from the wellhead to make the salvage device and the upper end of the well logging instrument string be clamped and fixed together, and then drag the well logging instrument string upward. The stopper will automatically reset due to the squeezing of the outer wall of the well logging instrument string, and the lock between the stopper and the well logging instrument string is released, so that the well logging instrument string can pass through the small water hole in the accident handling tool string upward and be salvaged out of the well.

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