Nail plate for fishing small falling objects in well

Abstract

The utility model discloses a nail plate for fishing small falling objects in a well, and relates to the field of well drilling and well repairing of oil and gas fields. The nail plate for fishing the small falling objects in the well comprises a connector, a nail inserting base is installed at the bottom of the connector, a mushroom inserting nail and a normally-open scissor inserting nail are arranged at the bottom end of the nail inserting base, and a through hole water hole is formed in the nail inserting base. According to the nail plate for fishing the small falling objects in the well, the fishing pipe column is lowered to the position 0.5-1 m above the small falling objects, direct circulation well washing is conducted, sundries around the small falling objects are flushed, then a pump is stopped, the fishing pipe column is lowered to the well bottom, bit pressure is applied, the mushroom plug pin or the normally-open scissor plug pin is folded, and the normally-open scissor structure is inserted into a soft small falling object ball or body, so that the small falling objects are fished out. Or small falling objects are squeezed into gaps of different sizes of the mushroom plug pin and the normally-open scissor plug pin, the falling objects are clamped under the action of elastic force, and the large-size mushroom head and the normally-open scissor structure hang the falling objects, so that the small objects in the well can be effectively salvaged.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas field drilling and well repairing, in particular to a nail plate used for salvaging small fallen objects in a well. Background Art

[0002] During the drilling and repairing process of oil and gas fields, various small objects such as irregular objects, rubber fragments, ropes, etc. that cannot be caught or salvaged often fall into the well and need to be salvaged. Currently, there are few types of salvage tools for small objects, which cannot adapt well to the conditions of hard well bottom. The success rate of salvage is low, and it is time-consuming and laborious. If salvage is not carried out, subsequent operations will be affected.

[0003] To this end, the present application now proposes a plug plate for salvaging small fallen objects in a well to solve the above-mentioned problems. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a nail plate for salvaging small objects that have fallen into a well, solving the problem that various small objects often fall into the well during drilling and well repair in oil and gas fields, the currently commonly used small object salvaging tools are relatively few types, cannot adapt well to the conditions of a hard well bottom, and have a low success rate in salvaging.

[0005] To achieve the above purpose, the utility model is implemented through the following technical scheme: a nail plate for salvaging small fallen objects in a well, including a joint, a nail seat is installed at the bottom of the joint, a mushroom nail and a normally open scissors nail are arranged at the bottom of the nail seat, and a through hole water eye is opened inside the nail seat.

[0006] Preferably, the top outer wall of the nail seat is provided with an external thread, the bottom end of the joint is threadedly connected to the outer surface of the external thread, and the top end of the joint is used to connect to the salvage pipe column.

[0007] Preferably, a central axis is provided in the center of the joint and the nail seat, and the through hole water eye passes through the joint and the salvage pipe column along the central axis.

[0008] Preferably, the number of the mushroom pins and the normally-open scissors pins is multiple groups, and the multiple groups of mushroom pins and the normally-open scissors pins are randomly arranged in disorder.

[0009] Preferably, the main bodies of the mushroom pin and the normally open scissors pin are both cylinders; a screw is provided on the top of the cylinder, the screw is threadedly connected to the pin seat, and the connection between the screw and the pin seat is reinforced by electric welding.

[0010] Preferably, the main body of the mushroom nail is a steel wire rope, the tip of the mushroom nail is a hemisphere, and the hemisphere is in the shape of a mushroom head.

[0011] Preferably, the tip of the normally-open scissors pin is a hemisphere; and a normally-open scissors structure is built-in at the front end of the normally-open scissors pin.

[0012] Preferably, the exposed length of the mushroom pin and the normally-open scissors pin is greater than twice the length of the long axis of the small fallen object; and a plurality of short axis and long axis dimensions of the small fallen object are arranged at the gap between the mushroom pin and the normally-open scissors pin, so that there are opportunities to insert, accommodate and clamp the fallen objects at multiple points and directions, thereby increasing the probability of catching them.

[0013] Preferably, a transition surface is provided at the lower end of the joint, and the angle between the transition surface and the central axis is 45°.

[0014] The utility model discloses a nail plate for salvaging small fallen objects in a well, and has the following beneficial effects: when in use, the salvage pipe column is lowered to a position 0.5 to 1 m above the small fallen objects, and the well is washed in a positive circulation. Under the impact of the water horsepower of the well washing fluid, mud, sand, drill cuttings and other debris around the small fallen objects are washed, the pump is stopped, the salvage pipe column is lowered to the bottom of the well and drilling pressure is applied, and mushroom pins or normally open scissor pins are retracted and normally open scissor structures are inserted into a soft small fallen object group or body, or the small fallen objects are squeezed into gaps of different sizes between the mushroom pins and the normally open scissor pins, and the fallen objects are clamped under the action of elastic force, and the larger mushroom heads and the normally open scissor structures hang the fallen objects to prevent the fallen objects from falling downward, and the salvage pipe column is slowly rotated and lifted up repeatedly for several times, and inserted and tried to be lifted at different positions, and then lifted out of the wellbore along with the salvage pipe column. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the bottom end surface of the nail seat of the utility model.

[0018] In the figure: 1. joint; 2. pin seat; 3. through-hole water eye; 4. center axis; 5. mushroom pin; 6. normally open scissors structure; 7. normally open scissors pin; 8. thread; 9. screw. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model is described clearly and completely. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] The embodiment of the present application provides a nail plate for salvaging small objects that have fallen into the well, thereby solving the problem that various small objects often fall into the well during drilling and well repair in oil and gas fields, and currently there are few types of commonly used small object salvage tools, which cannot adapt well to the conditions of hard well bottoms and have a low success rate in salvaging.

[0021] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] The utility model embodiment discloses a nail plate used for salvaging small fallen objects in a well.

[0023] According to the attached Figure 1-2 As shown, it includes a joint 1, a nail seat 2 is installed at the bottom of the joint 1, a mushroom nail 5 and a normally open scissor nail 7 are arranged at the bottom end of the nail seat 2, and a through hole water eye 3 is opened inside the nail seat 2.

[0024] The top outer wall of the nail seat 2 is provided with an external thread 8, the bottom end of the joint 1 is threadedly connected to the outer surface of the external thread 8, and the top end of the joint 1 is used to connect the salvage pipe column.

[0025] A central axis 4 is provided at the center of the joint 1 and the nail seat 2 , and a through hole water eye 3 passes through the joint 1 and the salvage pipe column along the central axis 4 .

[0026] The number of mushroom pins 5 and normally-open scissors pins 7 is multiple groups, and the multiple groups of mushroom pins 5 and normally-open scissors pins 7 are randomly arranged in disorder.

[0027] The main bodies of the mushroom pin 5 and the normally open scissors pin 7 are both made of sucker rods and are cylindrical; a screw 9 is provided at the top of the cylinder, and the screw 9 is threadedly connected to the pin seat 2. The connection between the screw 9 and the pin seat 2 is strengthened by electric welding and then annealed to increase the flexibility of the pin rod and prevent breakage. The length of the screw 9 is I=30mm.

[0028] The main body of the mushroom nail 5 can also be made of a high-strength, high-elastic steel wire rope. The tip of the mushroom nail 5 is a hemisphere, and the hemisphere is in the shape of a mushroom head.

[0029] The tip of the normally open scissors pin 7 is a hemisphere; the front end of the normally open scissors pin 7 is built with a normally open scissors structure 6, which can be opened and closed freely and is in a normally open state. The size of the normally open scissors is set to n = 22 ~ 24mm.

[0030] The exposed length L of the mushroom pin 5 and the normally-open scissors pin 7 is 2 to 3 times the long axis H of the small fallen objects, leaving redundancy; the gap between the mushroom pin 5 and the normally-open scissors pin 7 is provided with multiple short axis and long axis dimensions of small fallen objects, so that there are opportunities to insert, accommodate and clamp fallen objects at multiple points and directions, thereby increasing the probability of catching them. The outer diameter of the mushroom pin 5 rod is set to d=6~8mm, the mushroom head at the top of the mushroom pin 5 is m=10~14mm, the mushroom head at the top of the normally-open scissors pin 7 is 12mm, and the outer diameter of the normally-open scissors pin 7 rod is set to D=12mm.

[0031] The lower end of the joint 1 is provided with a transition surface, and the angle between the transition surface and the central axis 4 is α, α=30°~60°, which is convenient for lifting and lowering the salvage pipe column.

[0032] The outer diameter of the plug plate is Φ≦8~15mm of the inner diameter of the wellbore. When the wellbore is intact and unobstructed, a plug plate with a larger outer diameter is helpful in covering small fallen objects and improving the success rate of salvage.

[0033] In summary, compared with the prior art, the present invention has the following beneficial effects: by providing a plurality of randomly distributed mushroom pins 5 and normally open scissor pins 7 at the lower end of the pin seat 2, the gaps are provided with multiple short axis and long axis sizes of small fallen objects equal to or less than 2 mm, so that there are opportunities to insert, clamp and accommodate fallen objects at multiple points and directions. When in use, the salvage pipe string is lowered to 0.5 to 1 m above the small fallen objects, and the well is washed in a positive circulation. Under the impact of the water horsepower of the well washing fluid, the mud, sand and drill cuttings around the small fallen objects are washed away. Remove debris such as debris, stop the pump, lower the salvage pipe to the bottom of the well and apply drilling pressure, retract the mushroom pin 5 or the normally open scissors pin 7, and insert the normally open scissors structure 6 into the soft small object group or body, or squeeze the small objects into the gaps of different sizes between the mushroom pin 5 and the normally open scissors pin 7, clamp the objects under the action of elastic force, and the larger mushroom head and the normally open scissors structure 6 will hang the objects to prevent them from falling down and falling off. Repeat several times to slowly rotate and lift the salvage pipe, insert and try to lift it in different directions, and lift it out of the wellbore along with the salvage pipe.

[0034] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A nail plate for salvaging small fallen objects in a well, comprising a joint (1), It is characterized by: A nail seat (2) is installed at the bottom of the joint (1), and the nail seat (2) is used to salvage small objects that have fallen into the well; The bottom end of the pin seat (2) is provided with a mushroom pin (5) and a normally open scissor pin (7), and the gap between the mushroom pin (5) and the normally open scissor pin (7) is used to clamp small objects that fall into the well; The tips of the mushroom pin (5) and the normally-open scissor pin (7) are both hemispherical, and the hemispherical body is in the shape of a mushroom head. The front end of the normally-open scissor pin (7) is built with a normally-open scissor structure (6); A through hole water eye (3) is provided inside the nail inserting seat (2), and the through hole water eye (3) is used for drainage.

2. A nail plate for salvaging small fallen objects in a well according to claim 1, characterized in that: The top outer wall of the nail seat (2) is provided with an external thread (8), the bottom end of the joint (1) is threadedly connected to the outer surface of the external thread (8), and the top end of the joint (1) is used to connect to a salvage pipe column.

3. A nail plate for salvaging small fallen objects in a well according to claim 2, characterized in that: A central axis (4) is provided at the center of the joint (1) and the nail seat (2), and a through hole (3) penetrates the joint (1) and the salvage pipe column along the central axis (4).

4. A nail plate for salvaging small fallen objects in a well according to claim 1, characterized in that: The mushroom pins (5) and the normally-open scissors pins (7) are provided in multiple groups, and the multiple groups of mushroom pins (5) and the normally-open scissors pins (7) are arranged in a random order.

5. A nail plate for salvaging small fallen objects in a well according to claim 4, characterized in that: The main bodies of the mushroom pin (5) and the normally open scissors pin (7) are both cylindrical; a screw (9) is provided at the top of the cylinder, the screw (9) is threadedly connected to the pin seat (2), and the connection between the screw (9) and the pin seat (2) is reinforced by electric welding.

6. A nail plate for salvaging small fallen objects in a well according to claim 5, characterized in that: The mushroom pins (5) and the normally open scissors pins (7) are arranged at staggered heights.

7. A nail plate for salvaging small fallen objects in a well according to claim 1, characterized in that: The lower end of the joint (1) is provided with a transition surface, and the angle between the transition surface and the central axis (4) is 45°.

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