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CN-121993074-A - Device for salvaging falling objects with too small drift diameter

CN121993074ACN 121993074 ACN121993074 ACN 121993074ACN-121993074-A

Abstract

The invention belongs to the technical field of conventional well repair operation processes and matching, in particular relates to a device for salvaging junk with an excessively small drift diameter, and aims to solve the problems that in a well with a large drift diameter of a production casing and a small four-way drift diameter of a well head, junk salvaging is extremely difficult, and the existing solution has risks and limitations. The fishing tool comprises one end of a bent nipple connected with an oil pipe, the other end of the bent nipple connected with one end of a fishing tool, the other end of the fishing tool connected with one end of a wall hook, and a guide shoe which extends out of a well shaft along the radial direction of a fish top and is matched with well heads of different sizes through bending different angles is arranged at the other end of the wall hook and is used for righting the well fish and guiding the well fish into the fishing tool. The invention can adapt to the wellheads with different sizes, can salvage the falling objects without replacing the wellheads, reduces the construction risk and cost and improves the operation efficiency.

Inventors

  • LI DONG
  • ZHANG LAN
  • ZHU ZHIGUO
  • CHEN XUEYONG
  • MIAO YANPING
  • ZHENG JIANFENG
  • WEI HONGMAN
  • CAO CHENGCHENG
  • GUO HE
  • SHI GUANGYUAN

Assignees

  • 中国石油天然气股份有限公司

Dates

Publication Date
20260508
Application Date
20241105

Claims (8)

  1. 1. The device for salvaging the falling objects with the too small drift diameter is characterized by comprising a bent nipple (1) and a wall hook (2); One end and the oil pipe (3) of bent nipple (1) are connected, the other end and the one end of fishing tool (4) of bent nipple (1), the other end and the one end of wall hook (2) of fishing tool (4) are connected, the other end of wall hook (2) is provided with along the radial shoes (5) that guide the fish top of extending of pit shaft, shoes (5) are through the well head of the different sizes of angle matching of buckling, shoes (5) are used for righting down-hole fish (6), and will down-hole fish (6) are introduced fishing tool (4).
  2. 2. A device for salvaging junk with too small an drift diameter according to claim 1, characterized in that the bent sub (1) comprises a coupling (11), a bending section (12) and a first connecting section (13); The coupling (11) is used for connecting an oil pipe (3), the coupling is fixed with one end of a bending section (12), a first connecting section (13) is arranged at the other end of the bending section (12), and the first connecting section (13) is used for connecting one end of a fishing tool (4); the bending sections (12) are provided with different bending angles according to the drift diameter of the sleeve.
  3. 3. A device for fishing junk with too small an drift diameter according to claim 1, characterized in that the wall hook (2) comprises a second connecting section (21), a wall hook body (22) and a guide groove (23); The second connecting section (21) is used for connecting and communicating the other end of the fishing tool (4), the second connecting section (21) is fixed with one end of a wall hook body (22), the other end of the wall hook body (22) is fixed with the guide shoe (5), a bending angle is arranged between the guide shoe (5) and the wall hook body (22), and the bending angle is set based on a wellhead drift diameter; The wall hook is characterized in that a guide groove (23) is formed in the wall hook body (22), the guide groove (23) is communicated with the fishing tool (4), and the guide groove (23) is used for guiding the underground fish (6) to the fishing tool (4).
  4. 4. A device for fishing junk with too small an drift diameter according to claim 3, characterized in that the width of the guide groove (23) increases gradually from the second connecting section (21) to the guide shoe (5).
  5. 5. A small drift diameter junk fishing device in accordance with claim 3, wherein the maximum bend location is less than the wellhead drift diameter.
  6. 6. The device for salvaging junk with too small an drift diameter according to claim 1, wherein the bending direction of the bent nipple (1) when entering the well is the same as the bending direction of the guide shoe (5).
  7. 7. A device for salvaging junk with too small an drift diameter according to claim 2, characterized in that the first connecting section (13) is a screw thread.
  8. 8. A device for fishing falling objects with too small an drift diameter according to claim 3, characterized in that the second connecting section (21) is a female buckle.

Description

Device for salvaging falling objects with too small drift diameter Technical Field The invention belongs to the technical field of conventional well repair operation processes and accessories, and particularly relates to a device for salvaging junk with an excessively small drift diameter. Background At present, the well condition of an oil-water well gradually gets into the middle and later stages of exploitation, accidents such as down-hole falling objects are gradually increased year by year, the complicated conditions that a layer of sand is produced to hold a well tubular column, the falling objects cause the fish-roof to be salvaged, the tubular column and a sleeve annular space have falling objects and the like often occur, the difficulty is increased for salvaging the falling objects in the well, the construction procedure is increased, once the sand is improperly treated during construction, the salvaged tubular column is blocked in the well, the construction period is increased, the situation that the oil-water well cannot be processed is caused, and the oil-water well cannot be produced normally. In order to restore normal production of an oil-water well, downhole operation of the oil-water well is an important means, and therefore, the demand for fishing tools is also increasing. However, the prior tools for treating the well bore and fishing the fish are all established under the precondition that the four-way joint of the well head is consistent with the inner diameter of the casing. Because of the well completion mode, the production casing has larger drift diameter, and the wellhead installation diameter is changed by adopting a four-way joint with smaller drift diameter and a wellhead, so that the well is difficult to salvage once junk is generated. The existing scheme is to replace the small-drift-diameter wellhead with a large wellhead consistent with the inner diameter of the sleeve. In some cases, it is not possible to temporarily shut down the wellbore before the wellhead is replaced, which presents a certain risk in uncontrollable situations. Based on the above, the invention provides a device for salvaging falling objects with too small drift diameter. Disclosure of Invention In order to solve the problems in the prior art, namely that in the middle and later stages of oil-water well entering exploitation, falling objects accidents frequently occur due to the fact that downhole conditions are deteriorated, particularly in a well with a large production casing path and a small wellhead four-way path, falling objects are extremely difficult to salvage, and the problems of risks and limitations of the existing solutions (such as wellhead replacement) exist, the invention provides a falling object salvaging device with an excessively small path, which comprises a bent nipple and a wall hook; One end of the bent nipple is connected with an oil pipe, the other end of the bent nipple is connected with one end of a fishing tool, the other end of the fishing tool is connected with one end of a wall hook, the other end of the wall hook is provided with a guide shoe which radially extends out of a shaft to straighten a fish top, the guide shoe is matched with well heads of different sizes by bending different angles, and the guide shoe is used for righting the underground fish and introducing the underground fish into the fishing tool. In some preferred embodiments, the gap sub includes a collar, a bending section, and a first connecting section; The coupling is used for connecting an oil pipe, the coupling is fixed with one end of the bending section, a first connecting section is arranged at the other end of the bending section, and the first connecting section is used for connecting one end of a fishing tool; The bending section is provided with different bending angles according to the diameter of the sleeve. In some preferred embodiments, the wall hook includes a second connection section, a wall hook body, and a guide slot; The second connecting section is used for connecting and communicating the other end of the fishing tool, the second connecting section is fixed with one end of a wall hook body, the other end of the wall hook body is fixed with the guide shoe, a bending angle is arranged between the guide shoe and the wall hook body, and the bending angle is set based on a wellhead drift diameter; The wall hook body is provided with a guide groove, the guide groove is communicated with the fishing tool, and the guide groove is used for guiding the underground fish to the fishing tool. In some preferred embodiments, the width of the guide groove increases gradually from the second connecting section to the direction of the guide shoe. In some preferred embodiments, the maximum bend location is less than the wellhead path. In some preferred embodiments, the bending direction of the bent sub when it enters the well is the same as the bending direction of the guide shoe. In some preferred