Telescopic petroleum casing grouting circulating device

Abstract

The utility model relates to the technical field of petroleum drilling equipment, in particular to a telescopic petroleum casing grouting circulating device which comprises a conversion short section, a power device, a hydraulic valve group, a sliding sleeve, an adjusting short section and a sealing guide device. Slurry channels are machined in the conversion pup joint, the power device, the adjusting pup joint and the sealing guide device in the axial direction. The power device comprises a cylinder body, an upper main shaft and a lower main shaft, the upper main shaft is hermetically connected to the outer side of the lower part of the conversion nipple, and the lower main shaft is hermetically connected to the inner side of the lower part of the upper main shaft; the telescopic characteristic of the device is realized by arranging the power device, so that the sealing guide device can seal the inner cavity of the casing, the slurry at the whole well bottom can be dredged by utilizing a top drive slurry system, the slurry is circulated while a casing string is put down, and meanwhile, the device can perform grouting operation on a single casing by utilizing the top drive slurry system, so that the grouting efficiency is improved. And the working intensity of traditional grouting operation modes such as manual rubber pipe pulling grouting is reduced, and the working efficiency and the operation safety are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil drilling equipment, in particular to a telescopic oil casing grouting circulation device. Background Art

[0002] Casing operation is a key link in drilling and completion operations. It refers to the process of lowering casing with a diameter smaller than that of the open hole into a pre-designed well section through specific casing operation equipment. It is a very important operation link in drilling engineering. The purpose of casing operation is to separate the formation, reinforce the well wall, prevent oil and gas leakage, and establish oil and gas flow channels. If the casing is unreliable, it will affect the cementing quality, oil production, and the life of the oil well and casing. In serious cases, it will endanger the life safety of the casing operators, damage oil and gas resources, and lead to serious consequences such as the scrapping of oil and gas wells. With the increasing intensity and difficulty of oil and natural gas exploration and development, the downhole working conditions and wellbore structure are becoming increasingly complex, resulting in increasing difficulty in casing operation. In conventional casing operation, it is very easy to get stuck drills, encounter obstacles during casing operation, and it is difficult to lower the casing to the target position. The operation efficiency is low, the operation cost is high, and there are major safety hazards. Therefore, how to realize casing running operations safely and efficiently and reduce the cost of casing running operations has become the development direction and driving force of casing running equipment. Utility Model Content

[0003] The utility model provides a telescopic petroleum casing grouting circulation device, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problems of high work intensity and low work efficiency in the existing manual glue pulling grouting operation mode.

[0004] In order to solve the above problems, the utility model discloses a telescopic oil casing grouting circulation device, comprising a conversion nipple, a power unit, a hydraulic valve group, a sleeve, an adjusting nipple and a sealing guide device; the conversion nipple, the power unit, the adjusting nipple and the sealing guide device are all machined with mud channels along the axial direction inside; the power unit comprises a cylinder body, an upper main shaft and a lower main shaft, the outer side of the lower part of the conversion nipple is sealedly connected with the upper main shaft, the inner side of the lower part of the upper main shaft is sealedly connected with the lower main shaft, a cylinder body is arranged on the outer side of the upper main shaft, and a hydraulic valve group is arranged on the outer side of the cylinder body; a sleeve is sleeved on the outer side of the lower main shaft, the upper end of the sleeve is connected to the lower end of the cylinder body, the lower end of the sleeve is connected to the adjusting nipple, and the lower end of the adjusting nipple is connected to the sealing guide device; an end cover is installed on the lower end of the lower main shaft, and a mud pipe is sleeved on the inner side of the lower main shaft, the lower end of which passes through the end cover and extends to be sealed and connected with the inner side of the lower part of the sleeve.

[0005] The upper end face of the sliding sleeve is a flange end face, a stopper is processed on the upper end face of the sliding sleeve, and an annular notch is processed on the outer side of the upper part of the sliding sleeve; a first external thread is arranged on the outer side of the lower part of the sliding sleeve; and a through hole is arranged on the outer side of the lower part of the sliding sleeve.

[0006] The above also includes a thrust plate, which is an annular welded structure. An internal thread matching the first external thread is provided on the inner side of the thrust plate, and the thrust plate and the sliding sleeve are connected together by threads; a plurality of tension plates are provided at intervals along the circumferential direction on the outer side of the thrust plate, each tension plate is processed with a connecting hole, a first shackle is installed in the connecting hole, a second shackle is provided on the outer side of the sliding sleeve corresponding to the position above the thrust plate, and an anti-fall chain is connected between the first shackle and the second shackle.

[0007] The above-mentioned sealing guide device includes a guide cone, an anti-burst ring and a rubber cup. The inner side of the lower part of the adjusting short section is sealed and connected with the guide cone, the outer sealing sleeve in the middle part of the guide cone is equipped with the anti-burst ring, the outer sealing sleeve of the guide cone below the anti-burst ring is equipped with a rubber cup, and the lower end of the guide cone is axially provided with multiple jet holes that penetrate inside and outside.

[0008] The above also includes a lifting ear plate, and the lifting ear plate is welded on the outer side of the cylinder body.

[0009] A sealing groove is processed at the connection between the sliding sleeve and the mud pipe, and a sealing element is installed in the sealing groove.

[0010] The device is provided with a power device. According to the operation requirements, the sealing guide device can realize the sealing of the inner cavity of the casing through the telescopic characteristics of the device. When using different types of top drives, the distance from the bottom end of the sealing guide device to the top end of the casing coupling can be adjusted by converting short sections or adjusting short sections of different lengths to ensure that the sealing guide device can be fully inserted below the casing coupling to achieve complete sealing of the inner cavity of the casing. After completing the sealing of the inner cavity of the casing, the top drive mud system can be used to open up the entire bottom hole mud, realize the circulation of mud while lowering the casing string, and reduce the probability of potential operation accidents such as casing obstruction and jamming during the casing lowering operation; at the same time, the casing string can be pressed down by the thrust plate installed on the sliding sleeve to ensure that the casing string can be smoothly lowered to the target point; at the same time, the device can use the top drive mud system to grout a single casing, reducing the work intensity of traditional grouting operations such as manual hose grouting, improving work efficiency and operation safety, and the use of this equipment reduces the number of operators and reduces the labor intensity of operators, with the characteristics of safety, high efficiency, and easy installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0012] Figure 1 It is a schematic diagram of the main structure of an embodiment of the utility model.

[0013] Figure 2 for Figure 1 A partial cross-sectional view of .

[0014] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0015] Figure 4 It is a schematic diagram of the structure of the power device in the embodiment of the utility model.

[0016] Figure 5 It is a schematic diagram of the structure of the sliding sleeve in the embodiment of the utility model.

[0017] Figure 6 It is a schematic structural diagram of the thrust plate in the embodiment of the utility model.

[0018] Figure 7 It is a structural schematic diagram of the adjusting short section in the embodiment of the utility model.

[0019] Figure 8 It is a schematic structural diagram of the sealing guide device in the embodiment of the utility model.

[0020] Fig. 9 This is a schematic diagram of the utility model in the retracted state.

[0021] Fig.10 This is a schematic diagram of the utility model in the extended state.

[0022] In the figure: 1-conversion short section, 2-hydraulic valve group, 3-sliding sleeve, 4-adjusting short section, 5-cylinder body, 6-upper main shaft, 7-lower main shaft, 8-end cover, 9-mud pipe, 10-stop, 11-annular notch, 12-through hole, 13-thrust plate, 14-tension plate, 15-connecting hole, 16-first shackle, 17-second shackle, 18-anti-fall chain, 19-guide cone, 20-anti-burst ring, 21-rubber cup, 22-jet hole. DETAILED DESCRIPTION

[0023] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions.

[0024] The present invention is further described below in conjunction with the embodiments and drawings:

[0025] like Figure 1-8As shown, a telescopic oil casing grouting circulation device comprises a conversion nipple 1, a power unit, a hydraulic valve group 2, a sleeve 3, an adjusting nipple 4 and a sealing guide device; the conversion nipple 1, the power unit, the adjusting nipple 4 and the sealing guide device are all machined with mud channels along the axial direction inside; the power unit comprises a cylinder body 5, an upper main shaft 6 and a lower main shaft 7, the lower outer side of the conversion nipple 1 is sealedly connected with the upper main shaft 6, the lower inner side of the upper main shaft 6 is sealedly connected with the lower main shaft 7, the upper main shaft 6 is provided with a cylinder body 5 on the outer side, and the hydraulic valve group 2 is provided on the outer side of the cylinder body 5; the outer side of the lower main shaft 7 is sleeved with a sleeve 3, the upper end of the sleeve 3 is connected to the lower end of the cylinder body 5, the lower end of the sleeve 3 is connected to the adjusting nipple 4, and the lower end of the adjusting nipple 4 is connected to the sealing guide device; the lower end of the lower main shaft 7 is installed with an end cover 8, and the inner side of the lower main shaft 7 is sleeved with a mud pipe 9, the lower end of which passes through the end cover 8 and extends to be sealed and connected with the inner side of the lower part of the sleeve 3.

[0026] Among them, the adjusting pup joint 4 can be replaced with an adjusting pup joint 4 of different lengths according to the operation, and the distance between the bottom end of the sealing guide device and the top of a single coupling of the casing can be adjusted when using different top drive models to ensure the sealing performance of the sealing guide device; a thread is provided on the outer side of the upper part of the adjusting pup joint 4, which is used to match the thread provided on the inner side of the lower part of the sleeve 3, so as to achieve a sealed connection between the adjusting pup joint 4 and the sleeve 3; an internal thread is provided on the inner side of the lower part of the adjusting pup joint 4, which is used to match the thread provided on the outer side of the upper part of the sealing guide device, so as to achieve a sealed connection between the adjusting pup joint 4 and the sealing guide device.

[0027] A plurality of sealing grooves are machined on the inner side of the end cover 8, and sealing elements (which may be sealing rings) are installed in the sealing grooves, and the sealing elements are used to realize the sealing installation between the end cover 8 and the mud pipe 9; a sealing groove is machined at the connection between the upper main shaft 6 and the lower main shaft 7, and a sealing element is installed thereon, which is convenient for the sealing connection between the upper main shaft 6 and the lower main shaft 7; a sealing groove is machined at the connection between the upper main shaft 6 and the conversion short section 1, and a sealing element is installed thereon, which is convenient for the sealing connection between the conversion short section 1 and the upper main shaft 6.

[0028] The hydraulic valve group 2 may also be designed with a differential circuit and a hydraulic lock known in the art, so as to ensure the moving speed of the sleeve 3 through the differential circuit and improve the safety during operation through the hydraulic lock.

[0029] The device can realize the extension and retraction of the bottom sealing guide device under hydraulic power, and then realize the grouting of the casing column and the circulation of the mud system according to the operation needs. The operation process is simple and efficient, which can greatly improve the timeliness and casing running effect of the casing running operation.

[0030] Among them, the upper main shaft 6 and the lower main shaft 7 of the power device adopt a split structure, which reduces the difficulty of processing and manufacturing and improves the economy of parts replacement; at the same time, the cross-sectional area of ​​the upper main shaft 6 is larger than the cross-sectional area of ​​the lower main shaft 7, while improving the operation efficiency, it also greatly improves the ability of the device to bear the reaction force of mud when circulating mud; the upper main shaft 6 and the lower main shaft 7 of the power device pass through the cylinder body 5 and the sleeve 3, when the cylinder body 5 drives the sleeve 3 to move up and down, the movable part of the equipment has a long support length, the whole machine has strong rigidity, and can withstand large lateral forces and vertical main loads. At the same time, this structure makes the power unit and the sealing guide device have good sealing force effect, the whole machine seal has a good working environment, and the service life is long.

[0031] like Figure 1-8 As shown, the upper end face of the sleeve 3 is a flange end face, a stop 10 is processed on the upper end face of the sleeve 3, and an annular notch 11 is processed on the outer side of the upper part of the sleeve 3; a first external thread is provided on the outer side of the lower part of the sleeve 3; and a through hole 12 is provided on the outer side of the lower part of the sleeve 3 that passes through the inside and outside.

[0032] The interior of the above-mentioned sleeve 3 is a stepped through-hole structure; the sleeve 3 is connected to the lower end of the cylinder body 5 through bolts via the flange end face; the annular notch 11 is provided to fix the device during transportation; the through hole 12 is provided to serve as a movable breathing hole for the sleeve 3 and a mud leakage observation hole.

[0033] like Figure 1-8 As shown, it also includes a thrust plate 13, which is an annular welded structure, and an internal thread matching the first external thread is provided on the inner side of the thrust plate 13, and the thrust plate 13 is connected to the sliding sleeve 3 by threads; a plurality of tension plates 14 are provided at intervals along the circumferential direction on the outer side of the thrust plate 13, and each tension plate 14 is processed with a connecting hole 15, and a first shackle 16 is installed in the connecting hole 15, and a second shackle 17 is provided on the outer side of the sliding sleeve 3 corresponding to the upper position of the thrust plate 13, and an anti-fall chain 18 is connected between the first shackle 16 and the second shackle 17. Thus, the sliding sleeve 3 and the thrust plate 13 are connected together by the anti-fall chain 18, so as to prevent the thrust plate 13 from accidentally slipping during operation and improve the stability of the thrust plate 13.

[0034] like Figure 1-8 As shown, the sealing guide device includes a guide cone 19, an anti-burst ring 20 and a rubber cup 21. The inner side of the lower part of the adjusting short section 4 is sealed and connected with the guide cone 19, the outer side of the middle part of the guide cone 19 is sealed with the anti-burst ring 20, and the outer side of the guide cone 19 below the anti-burst ring 20 is sealed with a rubber cup 21. The lower end of the guide cone 19 is axially provided with a plurality of jet holes 22 that penetrate inside and outside. Among them, the area of ​​the jet holes 22 is equal to or greater than the cross-sectional area of ​​the mud channel, so that the device can still perform grouting operations without inserting the casing coupling, thereby improving the operation efficiency.

[0035] like Figure 1-8 As shown, it also includes a lifting lug plate, and the lifting lug plate is welded on the outside of the cylinder body 5. Thus, it is convenient to hoist the device.

[0036] like Figure 1-8 As shown, a sealing groove is processed at the connection between the sliding sleeve 3 and the mud pipe 9, and a sealing element is installed in the sealing groove. Thus, the sealing connection between the sliding sleeve 3 and the mud pipe 9 is facilitated.

[0037] When the device is in normal operation, Fig. 9 and 10 As shown, by connecting the conversion nipple 1 to the lower part of the top drive main shaft, the lifting ring and the extended lifting ring are connected to the top drive rotating head, and a hydraulic elevator is connected to the bottom end of the extended lifting ring, and the casing string is clamped inside the elevator. When the casing string circulation operation is required, under the action of the hydraulic oil, the cylinder 5 of the power device moves downward, thereby driving the sliding sleeve 3, the thrust plate 13, the adjusting nipple 4, the sealing guide device and the mud pipe 9 to move downward, and finally the sealing guide device is inserted into the inner cavity of the casing, so that the sealing guide device seals the inner cavity of the casing.

[0038] The specific process of casing grouting and circulation operation of this device is as follows:

[0039] When performing casing lowering operation, the conversion nipple 1 is installed at the lower end of the top drive main shaft, and the conversion nipple 1 with different thread forms is replaced to adapt to different types of top drives; the lifting ring and the extension lifting ring are connected to the top drive rotating head, and a hydraulic elevator is installed at the bottom of the extension lifting ring, and the casing string is clamped on the upper end surface of the elevator through the casing coupling; during the operation, when grouting operation is required, the driller starts the mud system, and the drilling mud enters the interior of the device through the top drive main shaft, and then flows out from the jet hole 22 of the guide cone 19 through the mud channels inside the conversion nipple 1, the power device, the mud pipe 9, the adjustment nipple 4, the sealing guide device and other components, and is poured into the inner cavity of the casing to complete the grouting operation of the casing string.

[0040] When the casing operation encounters resistance and the bottom hole mud operation needs to be performed, hydraulic oil is input into the hydraulic valve group 2. Under the action of the hydraulic oil, the cylinder 5 of the power device moves downward, thereby driving the sliding sleeve 3, the adjusting short section 4 and the sealing guide device connected to the cylinder 5 to move downward until the rubber cup 21 is inserted into the casing coupling; since the mud pipe 9 is installed inside the power device and is connected to the bottom of the sliding sleeve 3 by threads, when the sliding sleeve 3 moves downward, the mud pipe 9 moves downward at the same time; after the rubber cup 21 is inserted into the casing, the driller turns on the mud pump to pump mud into the top drive mud system. The mud enters the device through the top drive main shaft, and then enters the mud pipe 9 through the mud channels in the conversion short section 1, the upper main shaft 6, and the lower main shaft 7. Due to the sealing effect of the end cover 8 installed in the lower main shaft 7 and the outer wall of the mud pipe 9, the mud enters the sealing guide device along the mud channel inside the mud pipe 9, and flows out from the jet hole 22 at the end of the guide cone 19. Due to the sealing effect of the existing packer, the mud flows out from the jet hole 22 and enters the inside of the casing. As the mud pressure increases, the mud flows out from the bottom of the casing along the inner cavity of the casing, completing the operation of breaking through the mud at the bottom of the well.

[0041] When the casing lowering operation encounters resistance and needs to be pressed down, as described in the above operation, the bottom of the device is extended under the action of the hydraulic system, so that the thrust plate 13 is pressed down onto a single casing coupling, and then the driller controls the top drive to be lowered. The weight of the top drive is transmitted to the thrust plate 13 installed on the sliding sleeve 3 through the top drive main shaft, and further acts on the casing coupling. The weight of the top drive enables the casing string to overcome the casing sticking resistance, thereby realizing the casing string unblocking operation.

[0042] In summary, by setting a power device, the device can realize the sealing of the inner cavity of the casing through the telescopic characteristics of the device according to the operation needs. When using different types of top drive operations, the distance from the bottom end of the sealing guide device to the top end of the casing coupling can be adjusted by converting the short section 1 of different lengths or adjusting the short section 4 to ensure that the sealing guide device can be fully inserted below the casing coupling to achieve complete sealing of the inner cavity of the casing. After the sealing of the inner cavity of the casing is completed, the top drive mud system can be used to open up the entire bottom mud of the well to realize the circulation of mud while lowering the casing string. The grouting operation can be carried out by the top drive mud system to reduce the probability of potential operation accidents such as the casing encountering resistance and jamming during the casing lowering operation; at the same time, the casing string can be pressed down by the thrust plate 13 installed on the sliding sleeve 3 to ensure that the casing string can be smoothly lowered to the target point; at the same time, the device can use the top drive mud system to carry out grouting operation on a single casing, reduce the work intensity of traditional grouting operation methods such as manual rubber hose grouting, improve work efficiency and operation safety, and the use of the equipment reduces the number of operators and reduces the labor intensity of operators, and has the characteristics of safety, high efficiency and easy installation.

[0043] Furthermore, the device adopts a telescopic mud pipe 9 structure, which can relatively isolate the mud from the main seal of the power unit when conveying drilling mud. The confidential cover of the power unit seal has a good working environment, which is beneficial to the protection of the power unit seal and prolongs the service life of the whole machine.

Claims

1. A telescopic oil casing grouting circulation device, characterized in that: It includes a conversion nipple, a power unit, a hydraulic valve group, a sleeve, an adjusting nipple and a sealing guide device; the conversion nipple, the power unit, the adjusting nipple and the sealing guide device are all machined with mud channels along the axial direction inside; the power unit includes a cylinder body, an upper main shaft and a lower main shaft, the lower outer side of the conversion nipple is sealedly connected to the upper main shaft, the lower inner side of the upper main shaft is sealedly connected to the lower main shaft, a cylinder body is arranged on the outer side of the upper main shaft, and a hydraulic valve group is arranged on the outer side of the cylinder body; a sleeve is mounted on the outer side of the lower main shaft, the upper end of the sleeve is connected to the lower end of the cylinder body, the lower end of the sleeve is connected to the adjusting nipple, and the lower end of the adjusting nipple is connected to the sealing guide device; an end cover is installed on the lower end of the lower main shaft, and a mud pipe is mounted on the inner side of the lower main shaft, the lower end of which passes through the end cover and extends to be sealed and connected to the inner side of the lower part of the sleeve.

2. A telescopic oil casing grouting circulation device as claimed in claim 1, characterized in that: The upper end face of the sleeve is a flange end face, a stopper is processed on the upper end face of the sleeve, and an annular notch is processed on the outer side of the upper part of the sleeve; a first external thread is arranged on the outer side of the lower part of the sleeve; and a through hole is arranged on the outer side of the lower part of the sleeve.

3. A telescopic oil casing grouting circulation device as claimed in claim 2, characterized in that: It also includes a thrust plate, which is an annular welded structure. An internal thread matching the first external thread is provided on the inner side of the thrust plate, and the thrust plate and the sliding sleeve are connected together by threads. A plurality of tension plates are provided at intervals along the circumferential direction on the outer side of the thrust plate, and each tension plate is processed with a connecting hole, in which a first shackle is installed, and a second shackle is provided on the outer side of the sliding sleeve corresponding to the position above the thrust plate, and an anti-fall chain is connected between the first shackle and the second shackle.

4. A telescopic oil casing grouting circulation device as claimed in claim 1, 2 or 3, characterized in that: The sealing guide device includes a guide cone, an anti-burst ring and a rubber cup. The inner side of the lower part of the adjusting short section is sealed with a guide cone, the outer sealing sleeve in the middle part of the guide cone is equipped with an anti-burst ring, the outer sealing sleeve of the guide cone below the anti-burst ring is equipped with a rubber cup, and the lower end of the guide cone is axially provided with a plurality of jet holes that penetrate inside and outside.

5. A telescopic oil casing grouting circulation device according to claim 1, 2 or 3, characterized in that: It also includes a lifting ear plate, and the lifting ear plate is welded on the outer side of the cylinder body.

6. A telescopic oil casing grouting circulation device according to claim 4, characterized in that: It also includes a lifting ear plate, and the lifting ear plate is welded on the outer side of the cylinder body.

7. A telescopic oil casing grouting circulation device according to claim 1, 2, 3 or 6, characterized in that: A sealing groove is processed at the connection between the sliding sleeve and the mud pipe, and a sealing element is installed in the sealing groove.

8. The telescopic petroleum casing grouting circulation device according to claim 4 is characterized in that: A sealing groove is processed at the connection between the sliding sleeve and the mud pipe, and a sealing element is installed in the sealing groove.

9. The telescopic oil casing grouting circulation device according to claim 5, characterized in that: A sealing groove is processed at the connection between the sliding sleeve and the mud pipe, and a sealing element is installed in the sealing groove.

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