After-forging reamer for oil drilling and well repairing

Abstract

The utility model discloses an after-forging reamer for oil well drilling and repairing, and belongs to the technical field of underground drilling tools in oil and gas exploration and development. The reamer comprises a cylinder body and a piston assembly, a plurality of cutter grooves are formed in the cylinder body, cutter heads are arranged in the cutter grooves, one end of each cutter head is connected with the cylinder body through a hinge pin, the piston assembly is located in the cylinder body and slidably connected with the cylinder body, the piston assembly keeps in contact with the cutter heads, the piston assembly is sleeved with a reset piece, and the reset piece is connected with the cylinder body through a hinge pin. One end of the reset piece abuts against the step face A outside the piston assembly, and the other end of the reset piece abuts against the step face B in the cylinder. When the push broach head is opened outwards, the opening space of the broach groove is small, silt is not prone to entering the broach groove, or the amount of the silt entering the broach groove is small, and the risk that the broach head cannot be normally retracted into the broach groove is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a forged after hole opener for oil drilling and repairing well belongs to downhole drilling tool technical field in oil and gas exploration and development. BACKGROUND

[0002] The hydraulic hole opener adopts liquid driven opening type, can drill and expand simultaneously, can drill and then expand, can improve wellbore quality, and can improve casing running success rate and increase cementing annular space, so as to ensure well cementing quality. In addition, when drilling and expanding by using the drilling while expanding technology, the loss caused by the multiple use of drilling time can be significantly reduced, so as to reduce drilling and cementing cost.

[0003] The utility model discloses a small hole reamer, including body, upper joint and cutting tool, the upper joint is screwed on the body upper end, the cutting tool is fixed in the cutter groove on the body lateral wall, the cutting tool is hinged in the cutter groove on the body lateral wall, the cutting tool is distributed with a plurality of teeth around the hinge shaft on the hinge end, the inner wall of the cavity of the body is equipped with the shoulder, the body is equipped with the tubular piston rod in the cavity, the lower end of the piston rod is equipped with the piston, the outer wall of the piston rod is equipped with the tooth groove matched with the cutting tool tooth, the piston rod is equipped with the differential pressure nozzle on the pipe wall opposite to the cutter groove position of the body, the lower end surface of the piston is opposite to the shoulder in the cavity of the body and is equipped with the reset spring, the piston rod can make the cutting tool spread outwards through the cooperation of the tooth and the tooth groove under the action of the hydraulic pressure. It has the advantages of stable performance, reasonable structure and high operation efficiency.

[0004] However, during the expansion process of the small hole reamer, when the cutting tool is opened, the cutter groove opens a large space, and a large amount of silt is easy to enter the cutter groove, which increases the risk that the cutting tool cannot be normally retracted into the cutter groove. Utility model content

[0005] To solve the above technical problems, the utility model provides a forged after hole opener for oil drilling and repairing well.

[0006] The utility model discloses the following technical scheme can be implemented:

[0007] A forged after hole opener for oil drilling and repairing well, including cylinder and piston assembly, the cylinder is equipped with a plurality of cutter grooves, the cutter groove is equipped with a tool bit, and one end of the tool bit is connected with the cylinder through a hinge pin, the piston assembly is located in the cylinder and is connected with the cylinder slidingly, and the piston assembly keeps contact with the tool bit, the piston assembly is equipped with a reset piece, one end of the reset piece abuts on the step surface A outside the piston assembly, and the other end abuts on the step surface B in the cylinder.

[0008] When the cylinder is equipped with a plurality of cutter grooves, the plurality of cutter grooves are distributed in a circumferential array on the cylinder.

[0009] The cutter head comprises a cutter body, and a plurality of cutting teeth are arranged on the side of the cutter body away from the piston assembly and on the end of the cutter body away from the hinge pin.

[0010] The side of the cutter body away from the piston assembly is also provided with a plurality of gauge teeth.

[0011] The piston assembly comprises a piston and a piston shaft in sliding connection with the barrel, and the piston shaft is inserted into the piston and threadedly connected with the piston.

[0012] The piston shaft is coaxially provided with a through hole A, the piston shaft is provided at one end of the through hole A with a nozzle and a back cap, the back cap is threadedly connected with the piston shaft, one end of the nozzle is axially limited by a step surface C in the piston shaft, and the other end is axially limited by the back cap.

[0013] The reset member is a spring.

[0014] One end of the barrel is threadedly connected with an upper joint, and the other end is threadedly connected with a lower joint.

[0015] The beneficial effects of the utility model lie in that when the cutter head is opened outward, the cutter groove has a small opening space, and it is difficult for the mud and sand to enter the cutter groove or the amount of the mud and sand entering the cutter groove is small, thereby reducing the risk that the cutter head cannot be normally retracted into the cutter groove. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The utility model is a structural schematic view;

[0017] Figure 2 The utility model is a three-dimensional structural schematic view.

[0018] In the drawing: 1 - upper joint, 2 - barrel, 20 - step surface B, 3 - piston, 4 - back cap, 5 - nozzle, 6 - reset member, 7 - piston shaft, 70 - through hole A, 8 - hinge pin, 9 - cutter head, 10 - cutter groove, 11 - lower joint, 12 - cutting tooth, 13 - gauge tooth. DETAILED DESCRIPTION

[0019] The technical scheme of the utility model will be further described below, but the scope of protection is not limited to the description.

[0020] For example, Figure 1 and Figure 2The utility model discloses a kind of forged after hole opener for petroleum drilling and repair well, including cylinder 2 and piston assembly, multiple cutter grooves 10 are set in cylinder 2, cutter head 9 is equipped in cutter groove 10, and one end of cutter head 9 is connected with cylinder 2 by hinge pin 8, the piston assembly is located in cylinder 2, and with cylinder 2 sliding connection, and piston assembly keeps contact with cutter head 9, reset member 6 is sleeved on the piston assembly, and one end of reset member 6 is abutted on the step surface A outside piston assembly, the other end is abutted on the step surface B 20 in cylinder 2.In use, forged after hole opener is under the action of pump, when circulating drilling fluid acts on piston assembly, pressure drop will be generated, the thrust generated by this pressure drop promotes piston assembly to move downward, reset member 6 is compressed, piston assembly pushes cutter head 9 to open outward, at this time, rotate cylinder 2, slowly lower drill tool to cutter head 9 with drill pressure, and eye expansion operation can be started, after eye expansion operation is finished, pump is closed, spring 6 is elongated reset, piston assembly pushes cutter head 9 to be collected in cutter groove 10.Cutter head 9 opens outward, cutter groove 10 opens small space, silt is not easy to enter cutter groove 10, or the amount of silt entering cutter groove 10 is less, reduce the risk that cutter head 9 cannot be normally collected in cutter groove 10.

[0021] Multiple cutter grooves 10 are circumferentially arrayed on cylinder 2 when being set in cylinder 2.

[0022] Cutter head 9 includes cutter body, and multiple cutting teeth 12 are equipped on the side of cutter body away from piston assembly and the end of cutter body away from hinge pin 8.In the side of cutter body away from piston assembly and the end of cutter body away from hinge pin 8, multiple cutting teeth 12 are installed, and the number of cutting teeth 12 participating in eye expansion is more during operation, so as to improve the eye expansion efficiency of hole opener.The prior art with publication number CN202627970U only has a small amount of cutting teeth on the end of cutting knife away from piston rod to participate in eye expansion during operation, so the eye expansion efficiency is low.

[0023] Multiple gauge teeth 13 are also installed on the side of cutter body away from piston assembly in the case that cutting tooth 12 is installed on cutter head 9, so as to improve the impact resistance of cutter head 9 while considering the cutting performance of cutter head 9.

[0024] The piston assembly includes piston 3 and piston shaft 7 in sliding connection with cylinder 2, and one end of piston shaft 7 is inserted into piston 3 and is in screw connection with piston 3.In use, piston 3 is arranged close to upper joint 1.

[0025] Coaxial through hole A 70 is provided on piston shaft 7, nozzle 5 and back cap 4 are provided on one end of through hole A 70 in piston shaft 7, back cap 4 is in screw connection with piston shaft 7, one end of nozzle 5 is axially limited by step surface C in piston shaft 7, and the other end is axially limited by back cap 4.

[0026] The reset member 6 is a spring.

[0027] One end of the barrel 2 is threadedly connected with an upper joint 1, and the other end is threadedly connected with a lower joint 11.

[0028] The forged post-reaming device for oil drilling and well repairing has the following working principle:

[0029] Under the action of the pump, the circulating drilling fluid enters the inner hole of the piston shaft 7 from the inner hole of the upper joint 1 through the back cap 4 and the nozzle 5. Since the cross-sectional area of the piston 3 is much larger than the inner hole area of the nozzle 5, the circulating drilling fluid will produce a pressure drop when it enters the inner hole of the piston shaft 7 through the nozzle 5. The thrust generated by the pressure drop pushes the piston assembly to move downward, and the spring 6 is compressed. The piston shaft 7 pushes the cutter head 9 to open outward. At this time, the upper joint 1, the barrel 2 and the lower joint 11 rotate together, and the drilling tool is slowly lowered to add drilling pressure to the cutter head 9, and the reaming operation can be started. After the reaming operation is completed, the pump is closed, the spring 6 is stretched and reset, and the piston shaft 7 pushes the cutter head 9 back into the cutter groove 10.

Claims

1. A post-forged hole opener for oil drilling and well servicing, characterized by: The utility model provides a cutting device, including cylinder (2) and piston assembly, a plurality of cutter grooves (10) are set up on cylinder (2), cutter head (9) is equipped in cutter groove (10), and one end of cutter head (9) is connected with cylinder (2) through hinge pin (8), the piston assembly is located in cylinder (2) and is connected with cylinder (2) slidingly, and piston assembly keeps contact with cutter head (9), and the piston assembly is sleeved with reset member (6), and one end of reset member (6) is abutted on the step face A outside piston assembly, and the other end is abutted on the step face B (20) in cylinder (2), When a plurality of cutter grooves (10) are set up on cylinder (2), a plurality of cutter grooves (10) are distributed in circumferential array on cylinder (2), Cutter head (9) includes cutter body, and the side of cutter body away from piston assembly and the end of cutter body away from hinge pin (8) are equipped with a plurality of cutting teeth (12) respectively. The side of cutter body away from piston assembly is also equipped with a plurality of gauge teeth (13).

2. The post-forged hole opener for oil drilling and well repair of claim 1, characterized in that: The piston assembly includes piston (3) and piston shaft (7) connected with cylinder (2) slidingly, and one end of piston shaft (7) is inserted into piston (3) and is connected with piston (3) threadedly.

3. The post-forged hole opener for oilfield drilling and workover as claimed in claim 2, characterized in that: Coaxial through hole A (70) is equipped on piston shaft (7), nozzle (5) and back cap (4) are equipped in piston shaft (7) on one end of through hole A (70), back cap (4) is connected with piston shaft (7) threadedly, one end of nozzle (5) is axially limited through the step face C in piston shaft (7), and the other end is axially limited through back cap (4).

4. The post-forged hole opener for oilfield drilling and workover as claimed in claim 1, wherein: Reset member (6) is spring.

5. The post-forged hole opener for oilfield drilling and workover as claimed in claim 1, wherein: One end of cylinder (2) is connected with upper joint (1) threadedly, and the other end is connected with lower joint (11) threadedly.

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