Multifunctional diameter-variable drift size gauge tool

Abstract

The invention relates to the technical field of diameter-variable drift size gauges, in particular to a multifunctional diameter-variable drift size gauge which comprises a lower connector, an outer sliding cylinder fixedly installed at the right end of a connecting cylinder, a ball seat sealing starting mechanism arranged in an inner sliding sleeve, a linkage diameter-variable shrinkage mechanism arranged between a fixed sliding sleeve and a second shrinkage sliding sleeve, and an upper connector fixedly installed on the right side of the inner sleeve. A connecting ring is fixedly installed on the outer surface of the upper connector, a righting mechanism is fixedly installed on the outer side of the connecting ring, external threads are arranged on the surface, located on the outer side of the connecting ring, of the upper connector, the external threads are sleeved with a connecting sleeve, and a connecting mechanism is arranged in the connecting sleeve. The combined barrel is adopted, the rigidity of the drift size gauge tool is guaranteed through cooperation with the internal connecting plate, and the situation that the drift size effect cannot be achieved due to external force in the construction operation process is avoided; rapid connection of the drift size gauge tool and the well drilling pipe can be achieved through the connecting mechanism, and the locking toothed plate which is slidably installed is arranged in the connecting sleeve and used for being in threaded fit with a connector of the drift size gauge tool and the well drilling pipe.

Description

Technical Field

[0001] The invention relates to the technical field of variable-diameter well gauges, and in particular to a multifunctional variable-diameter well gauge. Background Art

[0002] The variable diameter well gauge is a tool used in oilfield downhole operations. It is mainly used to detect whether the casing of oil and water wells is deformed, reduced in diameter, bent, etc. The characteristics of this tool allow its outer diameter to be adjusted as needed to adapt to casings with different inner diameters, thereby improving the safety and efficiency of operations. The variable diameter well gauge removes debris or burrs on the inner wall of the casing to ensure that the inside of the casing is unobstructed, providing conditions for subsequent perforation, lowering of well pipes and tools, etc.

[0003] In oil production operations, when downhole tools are lowered for related operations, in order to ensure the passability of the lowered pipe string, it is necessary to detect the wellbore size and deformation. Currently, most of the wellbore gauges used are of the same specification and can only meet the well inspection of the relative wellbore size. The structure of the actual oil well is from large size to small size from the wellhead to the bottom of the well. Therefore, when performing wellbore operations, it is necessary to first select the corresponding small-size wellbore gauge for wellbore operations at the bottom of the well, and then replace the large-size wellbore gauge for wellbore operations at the upper wellbore, and so on. In the prior art, the oil field needs to complete the well cleaning operation of the entire wellbore during the well cleaning operation, and needs to constantly lift the well and replace the well cleaning gauges of corresponding specifications, which greatly affects the operation efficiency and increases the operation cost. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings existing in the background technology and to propose a multifunctional variable-diameter well gauge.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a multifunctional variable diameter well gauge, comprising a lower joint, a connecting tube fixedly installed on the right end of the lower joint, a sealing ring is provided between the lower joint and the connecting tube, an outer sliding tube is fixedly installed on the right end of the connecting tube, a ball seat sealing starting mechanism is provided inside the inner sliding sleeve, a second shrinking sliding sleeve is provided on the right end of the outer sliding sleeve, a first shrinking sliding sleeve is provided on the right side of the second shrinking sliding sleeve, a cylinder body is penetrated and installed on the inner side of the second shrinking sliding sleeve, a movable sliding sleeve is provided on the right side of the cylinder body, a fixed sliding sleeve is provided on the right side of the movable sliding sleeve, an inner sleeve is provided on the right side of the fixed sliding sleeve, a linkage variable diameter shrinking mechanism is provided between the fixed sliding sleeve and the second shrinking sliding sleeve, an upper joint is fixedly installed on the right side of the inner sleeve, a connecting ring is fixedly installed on the outer surface of the upper joint, a straightening mechanism is fixedly installed on the outer side of the connecting ring, an external thread is provided on the surface of the upper joint located on the outer side of the connecting ring, a connecting sleeve is sleeved on the outer side of the external thread, and a connecting mechanism is provided inside the connecting sleeve.

[0006] Preferably, the connecting mechanism includes a lower limit ring fixedly installed at the lower end of the connecting sleeve, a limit cone fixedly installed at the upper end of the inner wall of the connecting sleeve, an upper limit plate is provided inside the connecting sleeve at the lower end of the limit cone, a locking tooth plate is provided inside the connecting sleeve between the upper limit plate and the lower limit ring, and a third sealing ring is fixedly installed at the lower end of the upper limit plate.

[0007] Preferably, the straightening mechanism includes two connecting rings fixedly mounted on the outer surface of the upper joint, a plurality of equidistantly arranged spring sheets are provided between the two connecting rings, limiting convex plates are fixedly mounted on the outer surface of both ends of each spring sheet, and the spring sheets are inserted into the inner side of the connecting rings.

[0008] Preferably, the ball seat sealing starting mechanism includes an inner sleeve slidably mounted on the inner side of the sleeve, a steel ball is clamped on one side of the inner sleeve, a second sealing ring is provided between the sleeve and the connecting tube, a guide groove is provided on the outer surface of the inner sleeve, and two symmetrical limit pins are provided between the guide groove and the sleeve.

[0009] Preferably, two vertically symmetrical first pins are provided between the sliding sleeve and the connecting cylinder, and two vertically symmetrical second pins are provided between the sliding sleeve and the outer sliding cylinder.

[0010] Preferably, the linked variable-diameter contraction mechanism includes a plurality of support plates rotatably mounted on the outer surfaces of the first contraction sleeve and the fixed sleeve, each of which is rotatably mounted on the right end of the first contraction sleeve and has an arc plate rotatably mounted thereon, and a plurality of rotating seats rotatably mounted at both ends of the outer surface of the cylinder, each of which has a connecting support plate rotatably mounted on the upper end, each of which has an arc plate fixedly mounted on the upper end, and a fixing mechanism is provided between the fixed sleeve and the first contraction sleeve.

[0011] Preferably, the fixing mechanism includes a compression spring fixedly installed between the movable sleeve and the fixed sleeve, a plurality of support plates arranged at equal angles are rotatably installed on the outer surface of the fixed sleeve, a plurality of connecting plates arranged at equal distances are rotatably installed on the outer surface of the movable sleeve, the upper end of each connecting plate is rotatably installed on the lower surface of the support plate, and a clamping plate is rotatably installed at equal angles on the left side of the movable sleeve on the outer surface of the cylinder.

[0012] Preferably, a plurality of second connecting plates are rotatably mounted at equal angles on the right end of the second shrinking sliding sleeve, and an arc plate is rotatably mounted on the right end of each of the second connecting plates.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The upper end of the present invention is designed with a fixed structure, so that the diameter will not change due to the movement of the pipe string during the well-running process, which effectively reduces the risk of well-running operations; The invention is designed with a ball seat sealing start structure, so that the well gauge can work in the whole well when lowered into the well. When lowered to a designated position, a ball is dropped into the wellhead to pressurize and start the diameter-changing mechanism, thereby improving the diversity of operations. The present invention adopts a combined cylinder, and a plurality of arc plates form the cylinder, which cooperates with the internal connecting plate to ensure the rigidity of the well-drilling gauge, thereby avoiding the failure of well-drilling effect due to external force during the construction process; The present invention is provided with a straightening mechanism at the upper end to avoid tilting during the lifting process, to stabilize the moving direction, to prevent errors in the well-clearing process, and to significantly reduce friction resistance, improve liquid fluidity, and help improve the quality of the fixing operation; The invention can realize the quick connection of the well-drilling gauge and the drilling pipe through the connection mechanism. The interior of the connection sleeve is provided with a slidably installed locking tooth plate for threadedly matching the joint of the well-drilling gauge and the drilling pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of a multifunctional variable-diameter well gauge of the present invention; Figure 2 A cross-sectional view of a multifunctional variable-diameter well gauge of the present invention; Figure 3 A multifunctional variable-diameter well gauge according to the present invention Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the barrel structure of a multifunctional variable-diameter well gauge of the present invention; Figure 5 This is a schematic diagram of the connection mechanism structure of a multifunctional variable-diameter well gauge of the present invention; Figure 6 It is a schematic diagram of the structure of a straightening mechanism of a multifunctional variable-diameter well gauge of the present invention; Figure 7 This is a schematic diagram of the arc plate structure of a multifunctional variable-diameter well gauge of the present invention; Figure 8 This is a schematic diagram of the structure of a lower joint of a multifunctional variable-diameter well gauge of the present invention; Fig. 9 A multifunctional variable-diameter well gauge according to the present invention Figure 8 Enlarged view of point B in the middle.

[0015] In the figure: 1, upper joint; 2, inner sleeve; 3, fixed sleeve; 4, compression spring; 5, support plate; 6, connecting plate; 7, movable sleeve; 8, clamping plate; 9, connecting support plate; 10, cylinder; 11, lower joint; 12, sealing ring; 13, first pin; 14, second sealing ring; 15, sleeve; 16, inner sleeve; 17, steel ball; 18, second pin; 19, limit pin; 20, connecting cylinder; 21, Outer slide; 22, external thread; 23, arc plate; 24, pull rod; 25, second shrinkage sleeve; 26, second connecting plate; 27, first shrinkage sleeve; 28, guide groove; 29, rotating seat; 101, connecting sleeve; 102, locking tooth plate; 103, upper limit plate; 104, third sealing ring; 105, limiting cone; 106, lower limiting ring; 201, connecting ring; 202, spring leaf; 203, limiting convex plate. DETAILED DESCRIPTION

[0016] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0017] like Figure 1-Figure 9 The multifunctional variable-diameter well gauge shown in the figure comprises a lower joint 11, a connecting tube 20 is fixedly installed at the right end of the lower joint 11, a sealing ring 12 is arranged between the lower joint 11 and the connecting tube 20, an outer sliding tube 21 is fixedly installed at the right end of the connecting tube 20, a sliding sleeve 15 is arranged inside the outer sliding tube 21, an inner sliding sleeve 16 is arranged inside the sliding sleeve 15, a ball seat sealing starting mechanism is arranged inside the inner sliding sleeve 16, a second shrinking sliding sleeve 25 is arranged at the right end of the outer sliding tube 21, a first shrinking sliding sleeve 27 is arranged on the right side of the second shrinking sliding sleeve 25, a cylinder 10 is installed through the inner side of the second shrinking sliding sleeve 25, a movable sliding sleeve 7 is arranged on the right side of the cylinder 10, and a ball seat sealing starting mechanism is arranged inside the inner sliding sleeve 16 A fixed sleeve 3 is provided, an inner sleeve 2 is provided on the right side of the fixed sleeve 3, a linkage variable diameter shrinking mechanism is provided between the fixed sleeve 3 and the second shrinking sleeve 25, an upper joint 1 is fixedly installed on the right side of the inner sleeve 2, a connecting ring 201 is fixedly installed on the outer surface of the upper joint 1, a straightening mechanism is fixedly installed on the outer side of the connecting ring 201, an external thread 22 is provided on the surface of the upper joint 1 located on the outer side of the connecting ring 201, a connecting sleeve 101 is sleeved on the outer side of the external thread 22, a connecting mechanism is provided inside the connecting sleeve 101, a quick connection between the well gauge and the drilling pipe is achieved through the connecting mechanism, and the internal third sealing ring 104 cooperates with the upper limit plate 103 to form a seal.

[0018] like Figure 5As shown, the connecting mechanism includes a lower limit ring 106 fixedly installed at the lower end of the connecting sleeve 101, a limit cone 105 fixedly installed at the upper end of the inner wall of the connecting sleeve 101, an upper limit plate 103 is provided inside the connecting sleeve 101 at the lower end of the limit cone 105, a locking tooth plate 102 is provided inside the connecting sleeve 101 between the upper limit plate 103 and the lower limit ring 106, and a third sealing ring 104 is fixedly installed at the lower end of the upper limit plate 103. When connecting, the two connecting sleeves 101 placed up and down are rotatably installed at the upper joint 1 of the well gauge and the drilling pipe respectively, the internal locking tooth plate 102 is threadedly matched with the external thread 22 on the outside of the upper joint 1, and a seal is formed between the third sealing ring 104 at the lower end of the upper limit plate 103 and the upper joint 1.

[0019] like Figure 6 As shown, the straightening mechanism includes two connecting rings 201 fixedly mounted on the outer surface of the upper joint 1, and a plurality of equidistantly arranged spring pieces 202 are provided between the two connecting rings 201. Limiting convex plates 203 are fixedly mounted on the outer surfaces of both ends of each spring piece 202. The spring piece 202 is inserted into the inner side of the connecting ring 201. The spring piece 202 structure increases an additional circulation area, improves liquid fluidity, and helps to achieve high-quality cementing operations. When used in a deviated well, it can significantly reduce friction resistance.

[0020] like Figure 3 , Fig. 9 As shown, the ball seat seal starting mechanism includes an inner sleeve 16 slidably mounted on the inner side of the sleeve 15, a steel ball 17 is clamped on one side of the inner sleeve 16, a second sealing ring 14 is arranged between the sleeve 15 and the connecting tube 20, a guide groove 28 is opened on the outer surface of the inner sleeve 16, and two symmetrical limit pins 19 are arranged between the guide groove 28 and the sleeve 15. The limit pins 19 limit the sleeve 15, and the variable diameter well-drilling operation is performed within the limited range. When the radius needs to be expanded, the wellhead is continuously pressurized until the limit pin 19 is cut off, and the steel ball 17 and the inner sleeve 16 are knocked down, thereby achieving maximum well-drilling for subsequent operations.

[0021] Two vertically symmetrical first pins 13 are provided between the sliding sleeve 15 and the connecting cylinder 20 , and two vertically symmetrical second pins 18 are provided between the sliding sleeve 15 and the outer sliding cylinder 21 .

[0022] like Figure 2 , Figure 4 , Figure 8As shown, the linked variable diameter contraction mechanism includes a plurality of support plates 5 rotatably mounted on the outer surfaces of the first contraction sleeve 27 and the fixed sleeve 3, each of which is rotatably mounted on the right end of the first contraction sleeve 27 and is rotatably mounted with an arc plate 23, and a plurality of rotating seats 29 arranged at equal angles at both ends of the outer surface of the cylinder 10, each of which is rotatably mounted with a connecting support plate 9 on the upper end of each rotating seat 29, and each of which is fixedly mounted with an arc plate 23 on the upper end, and a fixing mechanism is provided between the fixed sleeve 3 and the first contraction sleeve 27.

[0023] The fixing mechanism includes a compression spring 4 fixedly installed between the movable sleeve 7 and the fixed sleeve 3. A plurality of support plates 5 arranged at equal angles are rotatably installed on the outer surface of the fixed sleeve 3. A plurality of connecting plates 6 arranged at equal distances are rotatably installed on the outer surface of the movable sleeve 7. The upper end of each connecting plate 6 is rotatably installed on the lower surface of the support plate 5. A clamping plate 8 is rotatably installed on the outer surface of the cylinder 10 on the left side of the movable sleeve 7 at equal angles. The elastic force of the compression spring 4 inside the fixing mechanism causes the fixed structure part to shrink to achieve diameter change, thereby effectively ensuring the realization of the overall diameter change function of the tool.

[0024] A plurality of second connecting plates 26 are rotatably mounted at equal angles on the right end of the second shrinking sleeve 25, and an arc plate 23 is rotatably mounted on the right end of each second connecting plate 26. A plurality of arc plates 23 are combined into a cylinder, and a plurality of connecting plates 6 for supporting are arranged inside, which effectively improves the rigidity of the well gauge and avoids deformation during use.

[0025] Working principle: When performing well clearing operations, first use a connecting mechanism to fix the well clearing gauge of the present invention on the lower end of the drilling pipe. A sealing ring is provided between the two upper and lower connected sleeves 101 to avoid leakage between the drilling pipe and the well clearing gauge. The connecting sleeve 101 is rotatably installed on the lower end of the drilling pipe. The connecting sleeve 101 on the other side is threadedly engaged with the locking tooth plate 102. The limiting cone 105 limits the upper limit plate 103 to achieve sealing after connection. The tapered thread connection method can achieve a fast and efficient sealing connection to avoid loosening and leakage during operation.

[0026] After being lowered into the well, the spring plate 202 structure in the straightening mechanism increases an additional flow area, improves the fluidity of the liquid, and helps to achieve high-quality cementing operations. When used in a deviated well, it can significantly reduce friction resistance.

[0027] The wellbore of large size is first inspected from the wellhead. When the inspection of this specification is completed and the wellbore of small size is continued to be lowered, a steel ball 17 is put into the wellhead, and the steel ball 17 falls into the inner sleeve 16 through the upper joint 1. The wellhead is pressing the second pin 18, so that the inner sleeve 16 moves downward, wherein the first pin 13 connects and fixes the inner sleeve 16 and the outer sleeve 21, and the inner sleeve 16 moves downward to drive the outer sleeve 21. The outer sleeve 21 drives the first shrinking sleeve 27 and the second shrinking sleeve 25 to move downward due to the action of the pull rod 24. The first shrinking sleeve 27 and the second shrinking sleeve 25 move downward and are driven by the pull rod 24 to shrink the cylinder 10. When the cylinder 10 starts to shrink, due to the shrinkage diameter getting smaller and smaller, it touches the card plate 8 at the upper end, and the card plate 8 starts to rotate, releasing the limit of the movable sleeve 7. The movable sleeve 7 moves downward under the thrust of the compression spring 4 due to the limit release. At this time, due to the action of the connecting plate 6, the support plate 5 shrinks into place; The pressure of the well-drilling gauge continues to push the inner sliding sleeve 16 downward and contacts the upper end surface of the lower joint 11 to limit it. At this time, the well-drilling gauge cylinder 10 is completely contracted, and the well-drilling operation of the small-sized wellbore is carried out; When the pipe string needs to be fully passed through the well for other operations, the wellhead continues to be pressurized until the limit pin 19 is sheared off, the steel ball 17 and the inner sliding sleeve 16 are knocked down, and the tool is fully passed through the well for subsequent operations.

[0028] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A multifunctional variable-diameter well gauge, comprising a lower joint (11), characterized in that: A connecting tube (20) is fixedly mounted on the right end of the lower joint (11), a sealing ring (12) is provided between the lower joint (11) and the connecting tube (20), an outer sliding tube (21) is fixedly mounted on the right end of the connecting tube (20), a sliding sleeve (15) is provided inside the outer sliding tube (21), an inner sliding sleeve (16) is provided inside the sliding sleeve (15), a ball seat sealing start mechanism is provided inside the inner sliding sleeve (16), a second shrinking sliding sleeve (25) is provided on the right end of the outer sliding tube (21), a first shrinking sliding sleeve (27) is provided on the right side of the second shrinking sliding sleeve (25), a cylinder (10) is installed through the inner side of the second shrinking sliding sleeve (25), and a cylinder (10) is provided on the right side of the cylinder (10). A movable sleeve (7) is provided on the right side of the movable sleeve (7), an inner sleeve (2) is provided on the right side of the fixed sleeve (3), a linked variable diameter shrinking mechanism is provided between the fixed sleeve (3) and a second shrinking sleeve (25), an upper joint (1) is fixedly installed on the right side of the inner sleeve (2), a connecting ring (201) is fixedly installed on the outer surface of the upper joint (1), a straightening mechanism is fixedly installed on the outer side of the connecting ring (201), an external thread (22) is provided on the surface of the upper joint (1) located on the outer side of the connecting ring (201), a connecting sleeve (101) is sleeved on the outer side of the external thread (22), and a connecting mechanism is provided inside the connecting sleeve (101).

2. A multifunctional variable-diameter well gauge according to claim 1, characterized in that: The connection mechanism comprises a lower limit ring (106) fixedly mounted on the lower end of the connection sleeve (101); a limit cone (105) is fixedly mounted on the upper end of the inner wall of the connection sleeve (101); an upper limit plate (103) is provided inside the connection sleeve (101) at the lower end of the limit cone (105); a locking tooth plate (102) is provided inside the connection sleeve (101) between the upper limit plate (103) and the lower limit ring (106); and a third sealing ring (104) is fixedly mounted on the lower end of the upper limit plate (103).

3. The multifunctional variable-diameter well gauge according to claim 1 is characterized in that: The straightening mechanism comprises two connecting rings (201) fixedly mounted on the outer surface of the upper joint (1), a plurality of equidistantly arranged shaped spring pieces (202) are provided between the two connecting rings (201), and limiting convex plates (203) are fixedly mounted on the outer surface of both ends of each shaped spring piece (202), and the shaped spring piece (202) is inserted into the inner side of the connecting ring (201).

4. The multifunctional variable-diameter well gauge according to claim 1 is characterized in that: The ball seat seal starting mechanism comprises an inner sleeve (16) slidably mounted on the inner side of the sleeve (15), a steel ball (17) being clamped on one side of the inner sleeve (16), a second sealing ring (14) being arranged between the sleeve (15) and the connecting tube (20), a guide groove (28) being arranged on the outer surface of the inner sleeve (16), and two symmetrical limit pins (19) being arranged between the guide groove (28) and the sleeve (15).

5. The multifunctional variable-diameter well gauge according to claim 4 is characterized in that: Two vertically symmetrical first pins (13) are provided between the sliding sleeve (15) and the connecting cylinder (20), and two vertically symmetrical second pins (18) are provided between the sliding sleeve (15) and the outer sliding cylinder (21).

6. The multifunctional variable-diameter well gauge according to claim 1 is characterized in that: The linked variable diameter contraction mechanism comprises a plurality of support plates (5) rotatably mounted on the outer surfaces of a first contraction sleeve (27) and a fixed sleeve (3), each of which is rotatably mounted on the right end of the first contraction sleeve (27) and has an arc plate (23) rotatably mounted thereon; a plurality of rotating seats (29) rotatably mounted on both ends of the outer surface of the cylinder (10); a connecting support plate (9) rotatably mounted on the upper end of each rotating seat (29); and an arc plate (23) fixedly mounted on the upper end of each connecting support plate (9); and a fixing mechanism is provided between the fixed sleeve (3) and the first contraction sleeve (27).

7. The multifunctional variable-diameter well gauge according to claim 1 is characterized in that: The fixing mechanism comprises a compression spring (4) fixedly mounted between the movable sleeve (7) and the fixed sleeve (3); a plurality of support plates (5) arranged at equal angles are rotatably mounted on the outer surface of the fixed sleeve (3); a plurality of connecting plates (6) arranged at equal distances are rotatably mounted on the outer surface of the movable sleeve (7); the upper end of each connecting plate (6) is rotatably mounted on the lower surface of the supporting plate (5); and a clamping plate (8) is rotatably mounted on the outer surface of the cylinder (10) on the left side of the movable sleeve (7) at equal angles.

8. The multifunctional variable-diameter well gauge according to claim 6 is characterized in that: A plurality of second connecting plates (26) are rotatably mounted at equal angles on the right end of the second shrinking sliding sleeve (25), and an arc plate (23) is rotatably mounted on the right end of each second connecting plate (26).

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