CN210858631U

CN210858631U - Local reverse circulation fishing basket with milling function

Info

Publication number: CN210858631U
Application number: CN201921684860.6U
Authority: CN
Inventors: 任利宝; 蔺国峰; 刘忠敏; 黄忠胜; 王勇; 付汉平; 邱永东
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd; Daqing Oilfield Co Ltd
Priority date: 2019-10-10
Filing date: 2019-10-10
Publication date: 2020-06-26
Anticipated expiration: 2029-10-10

Abstract

A local reverse circulation fishing basket with a milling function. The problem that a plurality of tools need to be repeatedly taken off and the fishing cycle is long when the existing reverse circulation fishing basket is used for fishing fallen objects is mainly solved. The method is characterized in that: the bottom of the upper connector (2) is connected with a valve cover (3), the bottom of the valve cover (3) is connected with a milling barrel (9), a basket assembly (8) is connected inside the milling barrel (9), the upper part of the basket assembly (8) is connected with a valve seat (5) through a barrel body (6), and a steel ball seat (4) is arranged on the upper part of the valve seat (5); the valve seat (5) and the valve cover (3) outside the valve seat are spaced, the valve seat (5) is provided with a communicating through hole A (10), the valve cover (3) is provided with a communicating through hole B (11) corresponding to the communicating through hole A (10), and the lower part of the communicating through hole B (11) on the valve cover (3) is provided with an injection hole (7). The local reverse circulation fishing basket with the milling function can achieve the milling and fishing functions once when going into a well, is high in fishing efficiency, and reduces the operation cost.

Description

Local reverse circulation fishing basket with milling function

Technical Field

The utility model relates to an oil field, a local reverse circulation salvage basket of area milling function specifically says so.

Background

The existing local reverse circulation fishing basket can only be used for fishing tools which are lighter and can break scattered objects in underground falling objects, and has the following defects: firstly, the volume of the cavity of the fishing tool is too small, the fishing cycle of the fallen objects is long, the efficiency is low, and the operation cost is increased; and secondly, in the fishing process, a milling tool is required to be firstly put in for milling, large falling objects are milled to be small, then the reverse circulation fishing basket is put in for fishing, various tools are repeatedly taken down, the operation cost is increased, and the labor intensity is increased.

SUMMERY OF THE UTILITY MODEL

Need relapse multiple instrument, the not enough of salvage cycle length down in order to overcome current reverse circulation junk basket when salvaging the junk, the utility model provides a local reverse circulation junk basket of function is milled in area, this local reverse circulation junk basket of function is milled in area once goes into the well and can realize milling and salvage the function, salvage efficiently, reduces the operating cost.

The technical scheme of the utility model is that: a local reverse circulation fishing basket with a milling function comprises a lifting joint, wherein the bottom of the lifting joint is connected with an upper joint, the bottom of the upper joint is connected with a valve cover, the valve cover is connected with a milling cylinder, a basket assembly is connected inside the milling cylinder, the upper part of the basket assembly is connected with a cylinder body, the upper part of the cylinder body is connected with a valve seat, and the upper part of the valve seat is provided with a steel ball seat; a gap is reserved between the valve seat and a valve cover outside the valve seat, the valve seat is provided with a connecting through hole A, the valve cover is provided with a connecting through hole B corresponding to the connecting through hole A, and an injection hole is formed below the connecting through hole B on the valve cover.

The outer sides of the connecting through holes A and B are inclined upwards, and the outer sides of the injection holes are inclined downwards.

The utility model discloses following beneficial effect has: due to the fact that the scheme is adopted, the bottom of the valve cover is connected with the milling barrel, when falling objects with overlarge volumes are encountered during well descending, the falling objects can be milled for a short time through the milling barrel, then the falling objects are salvaged through a basket, milling and salvage are combined into a whole, one-time well descending is achieved, milling and salvage work is completed, multiple tools are prevented from being repeatedly started, and salvage efficiency is improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure, 1-lifting joint, 2-upper joint, 3-valve cover, 4-steel ball seat, 5-valve seat, 6-cylinder, 7-jet hole, 8-basket assembly, 9-milling cylinder, 10-connecting hole A and 11-connecting hole B.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in figure 1, the local reverse circulation fishing basket with the milling function comprises a lifting joint 1, wherein the bottom of the lifting joint 1 is connected with an upper joint 2, the bottom of the upper joint 2 is connected with a valve cover 3, and the bottom of the valve cover 3 is connected with a milling cylinder 9. The grinding and milling barrel 9 is internally connected with a basket assembly 8, a step is arranged on the inner wall of the grinding and milling barrel 9, the basket assembly 8 is seated on the step, the upper portion of the basket assembly 8 is connected with a barrel body 6, the upper portion of the barrel body 6 is connected with a valve seat 5, and the upper portion of the valve seat 5 is provided with a steel ball seat 4. An annular gap is formed between the valve seat 5 and the valve cover 3 outside the valve seat, a communicating hole A10 is formed in the valve seat 5, and a communicating hole B11 corresponding to the communicating hole A10 is formed in the valve cover 3. The diameters of the communicating hole A10 and the communicating hole B11 are equal, the centers of the communicating holes are on the same straight line, and the outer sides of the communicating hole A10 and the communicating hole B11 are inclined upwards. The number of the connecting through holes A10 is the same as that of the connecting through holes B11, and the connecting through holes A10 and the connecting through holes B11 are 4 and are uniformly distributed along the circumferential direction. The lower part of the upper connecting through hole B11 of the valve bonnet 3 is provided with injection holes 7, the outer sides of the injection holes 7 are inclined downwards, and the number of the injection holes 7 is 20, and the injection holes are uniformly distributed along the circumferential direction.

When the fishing basket works, a ball is thrown from the fishing basket to the top of a fish, the steel ball enters the valve seat 5 through the steel ball seat 4 and then blocks a positive circulation channel at the center of the valve seat 5, the liquid flow is forced to change the flow direction, passes through the injection hole 7 after passing through a circulation space between the valve seat 5 and the valve cover 3, enters an annular space between a tool and a sleeve and is injected downwards, the liquid flow returns to the basket assembly 8 through the bottom of a well and then returns from 4 communicating holes at the upper part of the valve cover 3, and a local reverse circulation water flow channel of the annular space between the tool and the sleeve is formed for fishing operation. When the volume of the falling objects is too large, the falling objects are milled by the milling barrel 9 at the front end, so that the falling objects can enter the basket assembly 8, and the milling and fishing operation can be realized at the same time when the falling objects go down the well once.

The method is applied to a grinding and washing salvage field of a Fang 38-Flat 6 well junk well in the eighth oil production plant of the Daqing oilfield from 19 th to 3 th months in 2018, 9 times of pulling out and pulling down of a sand washing pipe column are reduced, 12 bridge plugs are successfully ground and milled for 8 times of grinding and milling, 4 times of sand washing are reduced, the grinding and washing are successfully salvaged, and the design standard requirement of the device is met.

Claims

1. The utility model provides a local reverse circulation junk basket of area milling function, includes lifting joint (1), lifting joint (1) bottom is connected upper joint (2), its characterized in that: the bottom of the upper connector (2) is connected with a valve cover (3), the bottom of the valve cover (3) is connected with a milling barrel (9), a basket assembly (8) is connected inside the milling barrel (9), the upper part of the basket assembly (8) is connected with a barrel body (6), the upper part of the barrel body (6) is connected with a valve seat (5), and a steel ball seat (4) is arranged on the upper part of the valve seat (5); the valve seat (5) and the valve cover (3) outside the valve seat are spaced, the valve seat (5) is provided with a communicating through hole A (10), the valve cover (3) is provided with a communicating through hole B (11) corresponding to the communicating through hole A (10), and the lower part of the communicating through hole B (11) on the valve cover (3) is provided with an injection hole (7).

2. The local reverse circulation fishing basket with the milling function according to claim 1, characterized in that: the outer sides of the connecting through hole A (10) and the connecting through hole B (11) are inclined upwards, and the outer sides of the injection holes (7) are inclined downwards.