CN215595525U - Screw rod core fishing tool - Google Patents

Abstract

The utility model discloses a screw rod core fishing tool, which comprises: the female cone is internally provided with a hollow structure; the drilling tool buckle is arranged at one end of the female cone; one end of the milling guide shoe is coaxially matched and connected with the other end of the female cone; the trapezoidal buckle is arranged at one end of the milling guide shoe; particle teeth circumferentially disposed on an inner wall of the milling guide; a lengthened hollow structure is arranged at one end, close to the drilling tool buckle, in the female cone; the drilling tool buckle is connected with the well entering pipe column; one end of the trapezoidal buckle is coaxially matched and connected with the other end of the female cone, and the other end of the trapezoidal buckle is of a guide shoe structure and is provided with a spiral horn-shaped opening; the cross section of each particle tooth is of an annular structure, and the longitudinal section of each particle tooth is of an arc structure; the granular teeth are made of alloy; the particle teeth are arranged along the inner wall of the milling guide shoe in a surfacing mode. The screw rod core fishing tool provided by the utility model can realize comprehensive operation of milling and peeling the core-pulling screw rod rotor sleeve and fishing the female tap buckle.

Description

Screw rod core fishing tool

Technical Field

The utility model relates to a screw rod core fishing tool, and belongs to the field of downhole operation tools.

Background

Due to the requirements of oil and gas exploration, development and deployment, the operations of deep wells, branch wells, horizontal wells and extended-reach wells are gradually increased, the construction scale of screw rod power drilling tools is more and more extensive, and the screw rod power drilling tools are often comprehensively applied by matching with rotary geosteering. However, when the screw rod power drilling tool is applied in a large scale, a plurality of well-breaking accidents also frequently occur, and serious property loss caused by MWD and rotary drilling is caused.

The problem of abrasion and slippage of the fishing tool is caused because the chromium coating layer on the surface of the screw rotor is hard and the prismatic surface is less in contact with the inner teeth of the fishing tool; in the past, the two-step fishing process of milling and peeling and female tap fishing is carried out. The fishing experience of the screw rotor is combined for many times, considering that the drilling accident treatment often takes a second for minutes, the possibility that the falling fish is stuck and the well is scrapped is increased by one minute when the falling fish is placed in the open hole section for more days; therefore, under the clear underground condition, a comprehensive tool which effectively combines the milling and peeling and the female cone fishing is necessary to be invented and innovated so as to reduce the accident handling time and avoid the risk of further deterioration of the underground accident.

SUMMERY OF THE UTILITY MODEL

The utility model designs and develops a screw rod core fishing tool, which can realize the comprehensive operation of milling and peeling a core-pulling screw rod rotor sleeve and fishing a female tap buckle.

The technical scheme provided by the utility model is as follows:

a screw core fishing tool comprising:

the female cone is internally provided with an accommodating cavity;

the drilling tool buckle is arranged at one end of the female cone;

the trapezoidal buckle is arranged at the other end of the female cone;

the milling guide shoe is connected with the trapezoidal buckle in a matching manner;

wherein the milling guide shoe and the female cone are coaxially arranged;

particle teeth circumferentially disposed on an inner wall of the milling guide.

Preferably, an elongated hollow section is arranged inside the female cone and close to one end of the drill tool buckle.

Preferably, the drill collar is connected to the well string.

Preferably, one end of the milling guide shoe is connected with the trapezoidal buckle in a matching mode, and the other end of the milling guide shoe is of a guide shoe structure and is provided with a spiral horn-shaped opening.

Preferably, the particle teeth have a ring-shaped cross section and an arc-shaped longitudinal section.

Preferably, the material of the particle teeth is alloy.

Preferably, the particle teeth are arranged along the inner wall of the milling guide shoe in a surfacing mode.

Preferably, the trapezoidal buckle is provided with an external thread, and one end of the milling guide shoe is provided with the external thread in a matching manner.

The utility model has the following beneficial effects: the screw rod core fishing tool provided by the utility model can combine the conventional screw rod rotor sleeve milling and peeling and the step-by-step treatment of the female tap making and fishing into one, and solves the construction task of the previous two drills by using the operation of one drill; under the condition of satisfactorily completing the underground production operation, the operation period is shortened, the unpredictable risk existing in the long-time open hole construction is avoided, and meanwhile, good economic benefit is obtained.

Drawings

FIG. 1 is a schematic structural view of a mouth-changing hollow female cone according to the present invention.

Fig. 2 is a schematic view of the structure of the milling guide shoe of the present invention.

FIG. 3 is a schematic view of the combination of the efficient fishing tool with screw rod and core according to the present invention.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the utility model by referring to the description text.

As shown in fig. 1-3, the present invention provides a screw core fishing tool, comprising: 1 variable-buckle hollow female cone, 2 sets of milling guide shoes, 3 drill buckles, 4 trapezoidal buckles, 5 lengthened hollow sections and 6 alloy particle teeth.

Screw rod core fishing tool mainly used screw rod is loosed core the back, under the operating mode of salvaging to the screw rod rotor that falls into the well, include: female awl 1 has in the inside of female awl 1 and holds the chamber, and the drilling tool is detained 3 and is set up the one end at the female awl for connect into the well tubular column, the other end of female awl 1 is provided with trapezoidal knot 4, and trapezoidal knot has the external screw thread, and trapezoidal knot 4 and the one end accordant connection of cover milling guide shoe 2 are provided with the granule tooth in the inside of cover milling guide shoe 2 along the inner wall of cover milling guide shoe 2.

In the present invention, the female cone 1 is preferably a snap-fit female cone.

A lengthened hollow section 5 is arranged at one end, close to the drilling tool buckle 3, inside the female cone 1 and used for increasing the space of fish, so that the problem of water jacking holes caused by rod falling of a screw rod is avoided, and one end of the milling guide shoe 2 is connected with the trapezoidal buckle 4 in a matching manner; the other end of the sleeve milling guide shoe 2 is in a guide shoe form, is provided with a horn-shaped opening and is of an upward spiral structure, fish falling is convenient to stir, particle teeth are formed in the sleeve milling guide shoe 2 in an overlaying mode, the cross section of each particle tooth 6 is annular, the longitudinal section of each particle tooth is arc-shaped, and the particle teeth 6 are arranged in the sleeve milling guide shoe 2 and can be used for milling and peeling the screw rotor sleeve.

In the present invention, the material of the granular teeth 6 is preferably an alloy.

Wherein, the female cone 1 designs the salvage range according to the parameter of the screw rod conventionally used, and the particle teeth 6 adjust the size of the surfacing welding according to the actual situation.

When the combined tool is used, the drilling tool buckles and the trapezoidal buckles are fastened according to standard upper buckling torque, the integrated combined tool is connected to the lower part of the well drilling tool, and whether the drift diameter meets the requirement is checked before entering the well. As the mother cone fishing operation is involved, the well drilling tool is provided with a safety joint. After the tool is connected, the tool enters a well, the well mouth is protected against falling objects, the tool is driven to a position 1-1.5m above the top of the fish, a pump is started to circulate, and parameter checking is carried out after the operation discharge capacity is stable; respectively recording the suspended weight of the above-mentioned lowering pipe column, the pump pressure and the idling torque value at the specified rotating speed under the start-stop pump; and a torque alarm limit value is set according to a certain additional degree, so that the safety of the pipe column is ensured. And (3) performing milling according to preset parameters, wherein the drilling pressure is 1-2t, the rotating speed is 50-70r/min, the displacement meets the requirement of carrying, and the footage is determined according to the length of the inner cavity of the tool. When milling the sleeve to the theoretical footage, observing the change of the pump pressure and the torque, and when the pump pressure is increased and the torque is increased, the footage making and fishing stage is carried out. Gradually increasing the bit pressure, and lifting up after making a button by 20-25KN.m to verify the fishing condition; and after the stable fish catching is confirmed, the subsequent unfreezing operation is started. The method comprises the steps of releasing a clamp through measures such as large-amplitude movable pipe columns, jarring, strong torsion and the like, reversely drilling to an upper well section after releasing the clamp, then fishing the pipe columns, paying attention to the fact that the reverse pipe columns are strictly forbidden in the drilling process, paying attention to the change of the suspended load through the position of a casing shoe and the position of a well mouth, and slowly passing through the well.

The thread type of the drilling tool thread 3 at one end of the female cone 1 is equivalent to the thread type of the well drilling tool, and the drilling tool thread belongs to an API standard thread type; the trapezoidal buckle 4 at the other end is the same as the buckle type of the milling guide shoe, and the trapezoidal buckle and the milling guide shoe are directly connected.

Examples

In the Chongqing area, the Lu 203H4-3 well is abnormal in pumping pressure during the rotational guiding and orienting operation process of 2 months and 2 days in 2021, and accessories such as a screw loose core, MWD, Schlumberger rotational guiding, a screw rotor and the like fall into the well through drill-out inspection. After an accident occurs, the screw milling and peeling treatment is firstly carried out, but the milling fails due to the influence of the tool size and the borehole expansion rate. For avoiding the casing milling construction influence activity duration again, then adopt this utility model screw rod core high-efficient fishing tool, realized the comprehensive operation of casing milling, salvage, successfully catch up the screw rod rotor, lead etc. soon and all fish in the pit.

The screw rod core fishing tool provided by the utility model can combine the conventional screw rod rotor sleeve milling and peeling and female cone buckle making and fishing step-by-step treatment measures into one according to different requirements of well conditions, and solves the construction task of the previous two drills by using the operation of one drill; under the condition of satisfactorily completing the underground production operation, the operation period is shortened, the unpredictable risk existing in the long-time open hole construction is avoided, and meanwhile, good economic benefit is obtained.

While embodiments of the utility model have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the utility model pertains, and further modifications may readily be made by those skilled in the art, it being understood that the utility model is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (8)

1. A screw core fishing tool, comprising:

the female cone is internally provided with an accommodating cavity;

the drilling tool buckle is arranged at one end of the female cone;

the trapezoidal buckle is arranged at the other end of the female cone;

the milling guide shoe is connected with the trapezoidal buckle in a matching manner;

wherein the milling guide shoe and the female cone are coaxially arranged;

particle teeth circumferentially disposed on an inner wall of the milling guide.

2. The screw core fishing tool of claim 1, wherein an elongated hollow section is provided inside the box near one end of the drill collar.

3. The screw core fishing tool of claim 2, wherein the drill collar is connected to a running string.

4. The screw rod core fishing tool of claim 3, wherein one end of the milling guide shoe is in matching connection with the trapezoidal buckle, and the other end of the milling guide shoe is of a guide shoe structure and is provided with a spiral trumpet-shaped opening.

5. The screw core fishing tool of claim 4, wherein the particle teeth are of annular configuration in cross-section and of arcuate configuration in longitudinal section.

6. The screw core fishing tool of claim 5, wherein the grain teeth are made of an alloy.

7. The screw core fishing tool of claim 6, wherein the particle teeth are provided by bead welding along an inner wall of the milling shoe.

8. The screw core fishing tool of claim 7, wherein the trapezoidal buckle has an external thread, and one end of the milling guide shoe is provided with an external thread in a matching manner.

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