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CN-121976767-A - Positioning milling cone for windowing

CN121976767ACN 121976767 ACN121976767 ACN 121976767ACN-121976767-A

Abstract

The invention belongs to the technical field of drilling equipment, and discloses a windowing positioning milling cone which is used for windowing operation of old well casing and comprises a joint, a drill bit and a guide part. The drill bit is fixedly connected to one end of the connector, which is far away from the driving mechanism, the drill bit is configured to cut and mill the side wall of the sleeve, the guide part is connected to one end of the drill bit, which is far away from the connector, a whipstock is arranged in the sleeve, one side of the whipstock is abutted against the sleeve, the other side of the whipstock is provided with a guide surface, the distance between the guide surface and the inner wall of the sleeve is gradually reduced, and the guide part can be abutted against the guide surface. Under the drive of actuating mechanism, connect and can drive the drill bit and rotate around self axial, the guide part can support and press in the guide surface for the drill bit can follow the guide surface and remove and gradually approach sheathed tube lateral wall, with accomplishing the operation of windowing, reduce the area of contact of drill bit and whipstock in the rotation in-process, prevent the point wearing and tearing of whipstock even wear.

Inventors

  • SUN LIWEI
  • LUO DA
  • ZHOU JIANHUA
  • GUO SHILIANG
  • WANG YEHAN
  • MENG QINGLIANG
  • LIU HUAN
  • CHEN FUJUN
  • LIU YANG
  • PING SHANHAI
  • WANG KEWEI
  • SHI LIANHAI
  • ZHANG ZENGQIANG
  • GAO QINGCHUN
  • CHEN ZHENGANG
  • ZHAO ZHAN
  • SHI HONGYAN
  • KONG DONGLIANG
  • ZHAO LEI
  • DAI YUNCAI

Assignees

  • 中国石油集团长城钻探工程有限公司
  • 中国石油天然气集团有限公司

Dates

Publication Date
20260505
Application Date
20241030

Claims (10)

  1. 1. A fenestration positioning milling cutter configured to extend into a sleeve (100) and fenestration on a sidewall of the sleeve (100), comprising: One end of the connector (1) is connected with the driving mechanism; a drill bit (2) fixedly connected to an end of the joint (1) remote from the drive mechanism, the drill bit (2) being configured to cut and mill a side wall of the casing (100); The guiding part (3) is connected to one end of the drill bit (2) far away from the joint (1), the sleeve (100) is internally provided with the whipstock (200), in the direction far away from the guiding part (3), one side of the whipstock (200) is attached to the sleeve (100), the other side is a guiding surface (201), the distance between the guiding surface (201) and the inner wall of the sleeve (100) is gradually reduced, and the guiding part (3) can be pressed against the guiding surface (201).
  2. 2. The fenestration positioning milling cutter according to claim 1, wherein the drill bit (2) comprises: A base body (21), A plurality of cutting blocks (22) arranged around the outer periphery of the base body (21) at intervals; and the milling blocks (23) are provided with a plurality of blocks, and the milling blocks (23) are arranged on the cutting blocks (22) at intervals.
  3. 3. The windowing positioning milling cone according to claim 2, wherein the base body (21) is provided with a gauge portion (211) and a frustum portion (212) connected to each other, the gauge portion (211) is cylindrical, the frustum portion (212) is in a truncated cone shape, and the diameter of the frustum portion (212) gradually decreases in a direction away from the gauge portion (211).
  4. 4. A windowing positioning milling cone according to claim 2, characterized in that the cutting blocks (22) are elongated and are arranged at an angle to the axial direction of the basic body (21).
  5. 5. The fenestration positioning milling cutter according to claim 2, wherein the material of the cutting block (22) is an alloy.
  6. 6. A windowing positioning milling cone according to claim 2, characterized in that the material of the milling block (23) is an alloy and the milling block (23) is in the form of granules.
  7. 7. The windowing positioning milling cone according to claim 2, wherein a plurality of diversion trenches (24) are further arranged on the base body (21) at intervals, and each diversion trench (24) is positioned between two adjacent cutting blocks (22).
  8. 8. The windowing positioning milling cone according to any one of claims 1 to 7, wherein the guiding portion (3) is cylindrical, and a rounded corner is arranged at one end of the guiding portion (3) away from the drill bit (2).
  9. 9. The windowing positioning milling cone according to any one of claims 1 to 7, wherein a water hole (31) is formed on the outer surface of the guiding part (3), and a water channel is formed in the joint (1), the drill bit (2) and the guiding part (3), and the water hole (31) is communicated with the water channel.
  10. 10. A windowing positioning milling cone according to any one of claims 1-7, wherein the guiding portion (3) is detachably connected to the drill bit (2).

Description

Positioning milling cone for windowing Technical Field The invention relates to the technical field of drilling equipment, in particular to a windowing positioning milling cone. Background The method for recovering the old well by sidetracking the open window of the old well casing to develop the residual oil reservoir is an effective method for recovering the old well and improving the oil and gas recovery ratio. The windowing milling cone in the prior art is influenced by the well structure and the construction design, and the steel level, the hardness and the thick wall of part of old well casing pipes are high, so that the tip of the whipstock is excessively milled and damaged in the windowing process, the whipstock body and the anchoring mechanism are even further damaged, and finally the windowing failure is caused. Disclosure of Invention The invention aims to provide a windowing positioning milling cone which is convenient to position while having small abrasion to a whipstock. To achieve the purpose, the invention adopts the following technical scheme: A fenestration positioning milling cutter configured to extend into a sleeve and fenestration on a sidewall of the sleeve, comprising: One end of the connector is connected with the driving mechanism; a drill bit fixedly connected to an end of the joint remote from the drive mechanism, the drill bit configured to cut and mill a sidewall of the casing; The guiding part is connected to one end of the drill bit, which is far away from the joint, the sleeve is internally provided with a whipstock, one side of the whipstock is clung to the sleeve in the direction away from the guiding part, the other side of the whipstock is a guiding surface, the distance between the guiding surface and the inner wall of the sleeve is gradually reduced, and the guiding part can be propped against the guiding surface. Preferably, the drill bit includes: The substrate is provided with a plurality of grooves, A plurality of cutting blocks arranged around the outer periphery of the base body at intervals; The milling block is provided with a plurality of blocks, and the milling blocks are arranged on the cutting block at intervals. Preferably, the base body is provided with a gauge portion and a frustum portion connected to each other, the gauge portion is cylindrical, the frustum portion is in a truncated cone shape, and the diameter of the frustum portion gradually decreases in a direction away from the gauge portion. Preferably, the cutting block has a long strip shape and is disposed at an angle to the axial direction of the base body. Preferably, the material of the cutting block is an alloy. Preferably, the material of the milling block is an alloy and the milling block is in the form of particles. Preferably, the substrate is further provided with a plurality of diversion trenches at intervals, and each diversion trench is located between two adjacent cutting blocks. Preferably, the guiding part is cylindrical, and a round corner is arranged at one end of the guiding part far away from the drill bit. Preferably, the outer surface of the guiding part is provided with a water hole, and the joint, the drill bit and the guiding part are internally provided with a water channel, and the water hole is communicated with the water channel. Preferably, the guide portion is detachably connected to the drill bit. The invention has the beneficial effects that: under the drive of actuating mechanism, connect and can drive the drill bit and rotate around self axial, and guide part cooperatees with the whipstock in the sleeve pipe, and guide part can support and press in the guide surface for the drill bit can follow the guide surface and remove and gradually approach sheathed tube lateral wall, with accomplishing the operation of windowing, reduce the area of contact of drill bit and whipstock in the rotation in-process, prevent the point wearing and tearing of whipstock even wear. Drawings FIG. 1 is a semi-sectional view of a fenestration positioning milling cutter according to the present invention; FIG. 2 is a side view in the direction A-A of FIG. 1; Fig. 3 is a cross-sectional view of the fenestration of the present invention positioned in a cannula. In the figure: 100. a sleeve; 200. a whipstock 201, a guide surface; 1. A joint; 2. 21 parts of drill bit, 21 parts of basal body, 211 parts of gauge protection, 212 parts of frustum, 22 parts of cutting block, 23 parts of milling block, 24 parts of diversion trench; 3. guide part, 31, water hole. Detailed Description Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar parts throughout, or parts having like or similar functions. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limi