Ultra-short simple drilling liner hanger tool assembly

Abstract

The utility model discloses an ultra-short simple drilling liner hanger tool assembly which comprises a core shaft, an outer cylinder is sleeved outside the core shaft, a locking claw and a piston are sequentially sleeved between the core shaft and the outer cylinder from top to bottom, a rubber plug body is arranged inside the core shaft, the lower end of the outer cylinder is connected with a short section, the lower end of the core shaft is connected with a nut, and a rubber plug shear pin is further arranged on a tube body of the core shaft. And by using the hydraulic releasing tool, the length of the product is shortened, and the problem that an ultra-short radius in-well hanger cannot be tripped in is effectively solved. And the hydraulic device and the workpiece lifted out of the well can be repeatedly used, so that the use cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the solid completion technology field, concretely relates to a kind of ultra-short simple liner hanger tool assembly. BACKGROUND

[0002] In the solid completion technology field of the field of oil and gas exploitation, using liner hanger for liner cementing operation can effectively reduce rig load and construction pressure, improve time efficiency and reduce cost. Liner hanger is seated by hydraulic or mechanical rotation. Currently, the overall length of commonly used liner hanger and tool assembly is between 5 meters and 8 meters, which is not smooth for downhole running in small-size sidetracking wells and may cause jamming. SUMMARY

[0003] The utility model aims at providing a kind of ultra-short simple liner hanger tool assembly to shorten the length of product and solve the difficulty of downhole running of liner hanger in ultra-short radius well.

[0004] The utility model aims at achieving the following technical means, a kind of ultra-short simple liner hanger tool assembly, including mandrel, the outer sleeve of mandrel is connected, and lock jaw and piston are sequentially connected from top to bottom between mandrel and outer sleeve, mandrel is internally provided with rubber plug body, outer sleeve lower end is connected with short section, mandrel lower end is connected with nut, and rubber plug shearing nail is also provided on the pipe body of mandrel.

[0005] The nut is located between the mandrel and the outer sleeve.

[0006] The rubber plug shearing nail is located on the pipe body of the mandrel, and the outer circular surface of the rubber plug body is provided with a rubber plug shearing nail slot, and the rubber plug shearing nail is inserted and fixed in the rubber plug shearing nail slot of the rubber plug body.

[0007] The upper end of the mandrel is also connected with a tool upper connector.

[0008] The rubber plug shearing nail is a hollow structure.

[0009] It also includes a release shear pin, and the outer sleeve and the lock jaw are fixed by the release shear pin.

[0010] It also includes a shear-off pin, and the outer sleeve and the piston are fixed by the shear-off pin.

[0011] The outer side of the rubber plug body is also provided with a rubber plug leather bowl, the lower end of the rubber plug body is also provided with a sealing ring and a snap spring, and the inner hole side wall of the rubber plug body is provided with a snap spring slot.

[0012] The outer upper end of the mandrel and the upper end of the outer sleeve are provided with torque grooves that cooperate with each other.

[0013] Space is left between the piston and the nut, and a first cavity is formed under the surrounding of the two-side mandrel and the outer sleeve, and a pressure transmission hole is opened on the outer sleeve corresponding to the first cavity.

[0014] The utility model discloses the beneficial effect lies in: because this hanger adopted hydraulic pressure release device, namely through hydraulic pressure cut-off release shear pin, the length of product has been shortened, effectively solved the difficulty of the well suspension ware of ultra-short radius that cannot be lowered. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the structure diagram of simple tail pipe hanger tool assembly for ultra-short,

[0016] Figure 2 It is the structure diagram of simple tail pipe hanger tool assembly for ultra-short,

[0017] Figure 3 It is the structure diagram of simple tail pipe hanger tool assembly for ultra-short, Figure 2 It is the structure diagram of simple tail pipe hanger tool assembly for ultra-short,

[0018] Figure 4 It is the structure diagram of simple tail pipe hanger tool assembly for ultra-short,

[0019] Figure 5 It is the structure diagram of simple tail pipe hanger tool assembly for ultra-short, Figure 4 It is the structure diagram of simple tail pipe hanger tool assembly for ultra-short,

[0020] Figure 6 It is the structure diagram of simple tail pipe hanger tool assembly for ultra-short,

[0021] Figure 7 It is the structure diagram of simple tail pipe hanger tool assembly for ultra-short, Figure 6 It is the structure diagram of simple tail pipe hanger tool assembly for ultra-short,

[0022] Figure 8 It is the structure diagram of simple tail pipe hanger tool assembly for ultra-short,

[0023] Figure 9 It is the structure diagram of simple tail pipe hanger tool assembly for ultra-short,

[0024] In the drawing, 1 is upper joint, 2 is mandrel, 3 is outer tube, 4 is locking claw, 5 is release shear pin, 6 is rubber plug body, 7 is rubber plug shear pin, 8 is piston, 9 is shear pin, 10 is nut, 11 is short section, 12 is rubber plug leather bowl, 13 is sealing ring, 14 is snap spring, 15 is snap spring slot, 16 is torque slot, 17 is pressure transmission hole, 18 is first cavity, 19 is drill rod rubber plug, 20 is locking claw slot

[0025] The utility model will be further explained in detail in connection with the drawings and examples. SPECIFIC EMBODIMENTS

[0027] A simple tail pipe hanger tool assembly for ultra-short, including mandrel 2, the outer sleeve of mandrel 2 is connected, mandrel 2 and outer sleeve 3 between still from top to bottom in turn have locking claw 4 and piston 8 of sleeve connection, mandrel 2 inside is provided with rubber plug body 6, outer sleeve 3 lower end is connected with short section 11, mandrel 2 lower end is connected with nut 10, mandrel 2 pipe body still is provided with rubber plug shear pin 7.

[0028] The nut 10 is located between the mandrel 2 and the outer cylinder 3.

[0029] like Figure 1 As shown, the main body of this application is an inner mandrel 2 and an outer cylinder 3 sleeved on the outside of the mandrel 2. The outer side of the mandrel 2 is provided with an inwardly recessed groove for fitting a locking claw 4, a piston 8 and a nut 10. The locking claw 4, piston 8 and nut 10 are all sleeved on the outside of the groove of the mandrel 2, located between the mandrel 2 and the outer cylinder 3.

[0030] The short section 11 is connected to the lower end of the outer cylinder 3 by a thread, and a rubber plug 6 is installed inside the spindle 2.

[0031] The upper part of the rubber plug 6 is located inside the mandrel 2, while the lower part extends into the short section 11.

[0032] The upper end of the short section 11 is connected to the outer cylinder 3 by a thread; the lower end is provided with a tapered thread to connect to the tailpipe downhole.

[0033] The lower end of the locking claw 4 has a claw-shaped structure that protrudes outward, and the outer cylinder 3 also has a corresponding outward protruding locking claw groove 20 to accommodate the protruding claw-shaped structure and fix the position of the locking claw 4.

[0034] The upper end of the locking claw 4 is fixedly connected to the spindle 2 via an internal thread.

[0035] The piston 8 is fitted onto the tube of the spindle 2, and the conical part at the upper end of the piston 8 is supported on the claw part of the locking claw 4, thereby fixing the locking claw 4 in the locking claw groove 20 inside the outer cylinder 3.

[0036] Both the piston 8 and the nut 10 are equipped with sealing rings on their inner and outer sides to ensure a seal with the parts in contact with the spindle 2 and the outer cylinder 3.

[0037] The rubber stopper 7 is located on the tube body of the mandrel 2, and the outer circular surface of the rubber stopper body 6 is provided with a rubber stopper 7 groove. The rubber stopper 7 is inserted into and fixed in the rubber stopper 7 groove of the rubber stopper body 6.

[0038] like Figure 9 As shown, the rubber stopper 7 has a hollow structure. When the rubber stopper 7 is cut, the hollow rubber stopper 7 can connect the inside and outside of the mandrel 2. A sealing ring is provided on the outside of the rubber stopper 7 to ensure the sealing effect between the rubber stopper 7 and the through hole when inserted into the through hole of the mandrel 2.

[0039] A hole is made in the tube of the mandrel 2, and the rubber stopper 7 is inserted into the hole from the outside of the mandrel 2 and into the rubber stopper 7 groove on the outer surface of the rubber stopper body 6. The rubber stopper 7 groove is located near the top of the rubber stopper body 6, thus fixing the mandrel 2 and the rubber stopper body 6 together.

[0040] The upper end of the mandrel 2 is also connected to a tool connector 1. The tool connector 1 is connected to the drill bit through the tapered thread on the upper end of the drill rod, and is connected to the mandrel 2 through the external thread on the lower end.

[0041] It also includes a drop-off scissors 5, with the outer cylinder 3 and locking claw 4 secured by the drop-off scissors 5. The drop-off scissors 5 is similar to a rubber stopper scissors 7, with a hole in the outer cylinder 3 and a groove in the locking claw 4. The drop-off scissors 5 passes through the hole in the outer cylinder 3 and is inserted into the groove in the locking claw 4, connecting and securing the outer cylinder 3 and the locking claw 4 together.

[0042] It also includes a shear pin 9, which secures the outer cylinder 3 and the piston 8. Similarly, the shear pin 9 has a hole in the outer cylinder 3 and a slot in the piston 8. The shear pin 9 passes through the hole in the outer cylinder 3 and inserts into the slot in the piston 8, connecting and securing the outer cylinder 3 and the piston 8 together.

[0043] The rubber stopper body 6 is also provided with a rubber stopper cup 12 on the outside, a sealing ring 13 and a retaining spring 14 at the lower end of the rubber stopper body 6, and a retaining spring groove 15 on the inner side wall of the rubber stopper body 6.

[0044] The rubber stopper cup 12 is connected to the outside of the rubber stopper body 6 and is located in the tail tube below the short section 11. The surface of the rubber stopper body 6 below the rubber stopper cup 12 is also provided with a sealing ring 13 and a retaining ring 14 from top to bottom.

[0045] A retaining ring groove 15 is provided on the inner side wall of the rubber plug body 6 to hold the retaining ring of the drill rod rubber plug 19 that is lowered in.

[0046] The upper outer end of the mandrel 2 and the upper end of the outer cylinder 3 are provided with torque grooves 16 that cooperate with each other.

[0047] Torque grooves 16 are milled on the upper outer end of the spindle 2 and the upper end of the outer cylinder 3, and the torque grooves 16 of the two engage with each other.

[0048] There is a space between the piston 8 and the nut 10, forming a first cavity 18 surrounded by the mandrels 2 on both sides and the outer cylinder 3. A pressure transmission hole 17 is opened on the outer cylinder 3 at the corresponding position of the first cavity 18.

[0049] The rubber stopper shear pin 7 is positioned above the piston 8, allowing the high-pressure liquid to shear the rubber stopper shear pin 7 under pressure. The liquid then enters the space above the piston 8 through the hollow rubber stopper shear pin 7, pushing the piston 8 downwards, i.e., towards the nut 10.

[0050] This hanger is connected to the cementing string. The drill string is lowered to the designed position using drill pipe. The outer cylinder 3 sits on the upper-mounted mounting section. Lower-level circulation cementing is performed. After cementing is complete, the drill pipe rubber plug 19 is inserted. The plug head of the drill pipe rubber plug is located inside the plug body 6. The retaining ring of the drill pipe rubber plug 19 is locked in the retaining ring groove 15 inside the plug body 6. The pressure inside the well shears off the plug shear pin 7. The drill pipe rubber plug 19 and the plug in the tailpipe collide and lock together, forming a composite plug that displaces the mud in the tailpipe and falls to the bottom of the well. When pressurized, the high-pressure liquid inside acts on the upper part of the piston 8 through the middle pressure transmission hole of the rubber plug shear pin 7. When the pressure rises to the shearing pressure of the shearing pin 9 on the outer cylinder 3, the shearing pin 9 is sheared, and the piston 8 moves downward to the upper end of the nut 10. At this time, the claw of the locking claw 4 can be pulled out from the locking claw groove of the outer cylinder 3. Pressurization continues until the shearing pressure of the release shear pin 5 is reached. The release shear pin 5 on the outer cylinder 3 is sheared, the tubing string is lifted, and the mandrel 2 drives the locking claw 4, piston 8, and nut 10 to move upward together, lifting the outer cylinder and out of the well.

Claims

1. A simple, ultra-short tailpipe suspension tool assembly, characterized in that: Includes a mandrel (2), an outer cylinder (3) is fitted around the mandrel (2), and a locking claw (4) and a piston (8) are fitted between the mandrel (2) and the outer cylinder (3) from top to bottom. A rubber plug body (6) is provided inside the mandrel (2), a short section (11) is connected to the lower end of the outer cylinder (3), a nut (10) is connected to the lower end of the mandrel (2), and a rubber plug shear pin (7) is also provided on the mandrel (2) tube.

2. The ultra-short, simple tailpipe suspension tool assembly according to claim 1, characterized in that: The nut (10) is located between the mandrel (2) and the outer cylinder (3).

3. The ultra-short, simple tailpipe suspension tool assembly according to claim 1, characterized in that: The rubber stopper scissor (7) is located on the tube of the mandrel (2), and the outer surface of the rubber stopper body (6) is provided with a rubber stopper scissor groove. The rubber stopper scissor (7) is inserted into and fixed in the rubber stopper groove of the rubber stopper body (6).

4. The ultra-short, simple tailpipe suspension tool assembly according to claim 1, characterized in that: The upper end of the mandrel (2) is also connected to a tool connector (1).

5. The ultra-short, simple tailpipe suspension tool assembly according to claim 1 or 2, characterized in that: The rubber stopper clip (7) has a hollow structure.

6. The ultra-short, simple tailpipe suspension tool assembly according to claim 1, characterized in that: It also includes drop scissors (5), outer cylinder (3) and locking claw (4) secured by drop scissors (5).

7. The ultra-short, simple tailpipe suspension tool assembly according to claim 1, characterized in that: It also includes shear pins (9), and the outer cylinder (3) and piston (8) are fixed by shear pins (9).

8. The ultra-short, simple tailpipe suspension tool assembly according to claim 1, characterized in that: The rubber stopper body (6) is also provided with a rubber stopper cup (12) on the outside, and a sealing ring (13) and a snap ring (14) are provided at the lower end of the rubber stopper body (6). A snap ring groove (15) is provided on the inner side wall of the rubber stopper body (6).

9. The ultra-short, simple tailpipe suspension tool assembly according to claim 4, characterized in that: The upper outer end of the mandrel (2) and the upper end of the outer cylinder (3) are provided with torque grooves (16) that cooperate with each other.

10. The ultra-short, simple tailpipe suspension tool assembly according to claim 4, characterized in that: There is a space between the piston (8) and the nut (10), forming a first cavity (18) surrounded by the mandrels (2) on both sides and the outer cylinder (3). A pressure transmission hole (17) is opened on the outer cylinder (3) corresponding to the first cavity (18).

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