CN111255404A

CN111255404A - Fishing barrel for auger type sucker rod centralizer

Info

Publication number: CN111255404A
Application number: CN202010068419.6A
Authority: CN
Inventors: 王志贤; 于生田; 郭晓娟; 曹立平; 刘勇; 高艳芹; 王月庆
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd; Daqing Oilfield Co Ltd
Priority date: 2020-01-21
Filing date: 2020-01-21
Publication date: 2020-06-09

Abstract

The invention relates to a fishing barrel of an auger type sucker rod centralizer. The main problem of solving current centralizer overshot salvage cycle length, salvage inefficiency. The method is characterized in that: the inner thread of the upper joint (1) is connected with a falling prevention device (2), the inner wall of the falling prevention device (2) is an inclined plane with an upper portion inclined inwards, a plurality of spring pieces (7) are fixed on the inclined plane through screws (8), the bottom of the falling prevention device (2) is connected with a barrel (3), a spiral auger (4) is arranged on the inner wall of the barrel (3), and the bottom of the barrel (3) is provided with a horn-shaped inner guide shoe (5). The fishing barrel of the auger type sucker rod centralizer can centralize the centralizer in a transverse state into an upright state, can salvage all centralizers at one time, and is high in fishing efficiency.

Description

Fishing barrel for auger type sucker rod centralizer

Technical Field

The invention relates to the field of oil fields, in particular to an auger type sucker rod centralizer overshot.

Background

After the sucker rod centralizer falls into the sleeve pipe on the oil field, in order to resume the normal production of oil well, need salvage the sleeve pipe with the centralizer. Currently, there are mainly the following four kinds of fishing tools: the main working principle of the fishing device comprises a fishing barrel for the reverse circulation sucker rod centralizer, a fishing barrel for the windowing of the centralizer of the screw pump well, a fishing barrel for the lengthened cavity-separated reverse circulation sucker rod centralizer and a fishing barrel special for the splicing centralizer. Salvage the inefficiency at salvaging centralizer in-process, there are following three aspect problems mainly: firstly, the length of the centralizer is 125mm-165mm, and the inner diameter of the casing is 124mm, so that the centralizer is inclined or transversely drilled after falling into the casing, and the centralizer is difficult to be straightened into an upright state from inclined or transversely drilled by a mechanical method and a reverse circulation well washing mode; secondly, the inner diameter of the stepped inclined guide at the lower part of the fishing barrel is usually 105mm, which is smaller than the length of the centralizer by 125mm-165mm, and the inclined or transverse centralizer is difficult to enter the inner cavity of the fishing barrel, so that the fishing success rate is low; thirdly, the length of the fishing barrel limits, the quantity of the centralizers contained in the barrel body is small, and the centralizers in the sleeve can be fished cleanly by fishing for many times.

Disclosure of Invention

In order to overcome the defects of long fishing cycle and low fishing efficiency of the existing fishing barrel of the centralizer, the invention provides the fishing barrel of the centralizer of the auger type sucker rod.

The technical scheme of the invention is as follows: the utility model provides an auger formula sucker rod centralizer overshot, includes the top connection, the inside threaded connection of top connection has the anti-falling device, and the anti-falling device inner wall is the inclined plane of upper portion leanin, has a plurality of spring leaf through the fix with screw on the inclined plane, the anti-falling device bottom is connected with the barrel, is equipped with spiral auger on the barrel inner wall, and the barrel bottom is the interior guide shoe of horn mouth shape.

The invention has the following beneficial effects: by adopting the scheme, the inner guide shoe at the bottom of the fishing barrel can centralize the centralizer in a transverse state and upwards convey the centralizer into the oil pipe through the packing auger, and the spring leaf of the anti-falling device can prevent the centralizer entering the oil pipe from falling. The fishing success rate is improved due to the centering effect of the inner guide shoes, and the fishing centralizer is temporarily stored in the oil pipe due to the fishing barrel, so that all centralizers can be fished at one time without going into the well for multiple times, and the fishing efficiency is improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic view of a drop preventer.

In the figure, 1-an upper connector, 2-a falling-off prevention device, 3-a cylinder, 4-a packing auger, 5-an inner guide shoe, 6-an external thread, 7-a spring leaf and 8-a screw.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which:

by figure 1, shown in figure 2, an auger type sucker rod centralizer overshot, including top connection 1, 1 lower extreme internal thread of top connection has anti-falling device 2, and anti-falling device 2 passes through external screw thread 6 to be connected on the top connection, and 2 lower extreme inner walls of anti-falling device are the upper portion inclined plane, and inclined plane upper portion leanin, are fixed with a plurality of spring leaf 7 through screw 8 on the inclined plane, because spring leaf 7 fixes on the inclined plane, constitute the fish cage formula structure of the inside shrink in upper portion jointly, can guarantee that the centralizer gets into oil pipe smoothly to effectively prevent the centralizer that gets into in the oil pipe and drop. The bottom of the anti-falling device 2 is connected with a cylinder body 3, a spiral auger 4 is arranged on the inner wall of the cylinder body 3, the bottom of the cylinder body 3 is a bell-mouth-shaped inner guide shoe 5, the inner diameter of the inner guide shoe 5 is gradually reduced from bottom to top, and a centralizer in a sleeve can be introduced into the cylinder body 3.

When the sucker rod centralizer is salvaged, the salvage cylinder is connected to the bottom of an oil pipe column through the upper joint 1, the salvage pipe column is rotated clockwise, the cylinder body 3 is driven to rotate, the inner guide shoes 5 can enable the centralizer to be inclined from a transverse state after entering the inner guide shoes, the centralizers are not crowded together, and the centralizers are enabled to enter the packing auger 4 one by one; the centralizer is moved to the top of the cylinder body 3 from the bottom of the cylinder body 3 by the rotary packing auger 4 and enters the inner cavity of the oil pipe through the anti-falling device 2. The centralizer entering the oil pipe can be prevented from falling off due to the fact that the upper parts of the spring pieces 7 on the anti-falling device 2 contract inwards. After the centralizer of a certain depth is salvaged, the pipe column continues to be lowered to repeat the last operation, and the centralizer in the casing pipe is salvaged one by one. As the number of the whole-well centralizers is only about 330, each oil pipe can contain 25 centralizers, the average number of the centralizers falling into the well is 60-70, 3-4 oil pipes can contain all the centralizers falling into the well, and the average number of the oil pipes falling into the well is more than 150, the centralizers falling into the well can be fished up at one time by using the tool.

Example (b):

6, 2 and 6 months in 2019, slowly inspecting the pump by 30-oblique 18 wells, pulling out the sucker rod, finding out that all the centralizers on the 151 th and 184 th sucker rods fall into the well, and checking the original data: 60 well centralizers are dropped, and 142 lower male buckles are found by lifting the oil pipe. Connecting a fishing barrel, lowering a fishing pipe column to a position 10cm away from the top of a fish top, slowly lowering the pipe column by 125-165 mm, enabling a first centralizer to enter the top of the fishing barrel from the bottom of the fishing barrel through an inner guide shoe fishing barrel and positively rotating the fishing pipe column, under the action of a rotary auger in the fishing barrel, enabling the centralizer to enter the top of the fishing barrel from the bottom of the fishing barrel and enter an oil pipe through a falling preventer, continuously lowering the pipe column by 125-162 mm after the second, third, fourth and fifth centralizers of the depth are fished, repeating the above operations, completely screwing the falling centralizer into the oil pipe, taking out the fishing pipe column through the centralizer contained in the oil pipe, and completely fishing out the centralizers in the oil pipe at one time.

Claims

1. The utility model provides an auger type sucker rod centralizer overshot, includes top connection (1), its characterized in that: the inner thread of the upper joint (1) is connected with a falling prevention device (2), the inner wall of the falling prevention device (2) is an inclined plane with an upper portion inclined inwards, a plurality of spring pieces (7) are fixed on the inclined plane through screws (8), the bottom of the falling prevention device (2) is connected with a barrel (3), a spiral auger (4) is arranged on the inner wall of the barrel (3), and the bottom of the barrel (3) is provided with a horn-shaped inner guide shoe (5).