CN-122014135-A - Three-wing rotary knife structure, system and construction method for cutting in drilling method sinking deep well drill rod

Abstract

The invention discloses a three-wing rotary knife structure, a system and a construction method for cutting in a drilling method sinking deep well drill rod, and belongs to the field of drilling mechanical engineering; the invention discloses a deep well drill rod inner cutting device, which aims to solve the problems of large vibration, low precision and poor safety in bottom hole cutting after drill rod breakage, and comprises a cutter head, a three-wing rotary knife capable of being thrown away centrifugally and a split type guide, wherein the three-wing rotary knife adopts staggered tooth installation to realize variable-diameter cutting, a clamping piece is prevented, stability is improved, the split type guide is provided with a rubber guide wheel for absorbing vibration and reducing abrasion of a rod piece and the guide, the optimal installation position and number of the guide are calculated and determined based on vibration response analysis of a drill rod-cutter system, so that vibration is effectively restrained, and efficient, stable and safe operation of deep well drill rod inner cutting is realized.

Inventors

• SUN XUEJUN
• YANG GUANG
• FU XINPENG
• YAN ZHONGJUN
• LI XIANGQIN
• LI KE
• Luan Delin
• ZHAO MINGHE
• XIE BAO
• CHENG HUA
• ZHU JIAN
• WANG ZONGJIN
• ZHU WEI
• WANG HAO
• WANG ZHONGKAI
• GAO KAI
• ZHAO WEIFENG

Assignees

• 中煤特殊凿井有限责任公司
• 安徽理工大学
• 鄂尔多斯市成达矿业有限公司
• 中煤第三建设（集团）有限责任公司

Dates

Publication Date

20260512

Application Date

20260210

Claims (10)

1. 1. The three-wing rotary knife structure for cutting in a drilling rod of a well drilling deep well by a drilling method is characterized by comprising the following components; a cutterhead drill pipe joint (1); The cutter head (2) is connected with the cutter head drill rod joint (1), the cutter head (2) comprises an upper cutter shell (201), a lower cutter shell (201) and a plurality of wing plates (202) for connecting the upper cutter shell and the lower cutter shell (201), and a mounting hole is formed in the cutter shell (201); The three-wing rotary knives (3) are multiple in number, each three-wing rotary knife (3) is rotatably installed in an installation hole of the knife shell (201) through a knife shaft (304) and can rotate around the knife shaft (304) and revolve around the center of the knife disc (2) under the driving of external force, and each three-wing rotary knife (3) comprises a knife body (303), a knife plate (302) fixed on the knife body (303) and a plurality of knife teeth (301) installed on the knife plate (302).
2. 2. The triple wing rotary cutter structure for cutting in a drilling shaft of a well drilling and sinking well according to claim 1, wherein the plurality of cutter teeth (301) are installed on the cutter plate (302) in staggered teeth along the radial direction.
3. 3. The three-wing rotary cutter structure for cutting in a drilling method sinking deep well drill rod according to claim 1 or 2, wherein the cutter teeth (301) are made of YS2T/325 alloy.
4. 4. The triple wing rotary cutter structure for cutting in a drilling method sinking deep well drill rod according to claim 1, wherein a plurality of grooves for installing the cutter teeth (301) are formed in the cutter plate (302), and the cutter teeth (301) are fixed in the grooves in a brazing mode.
5. 5. A system for deep well drill rod cutting is characterized by comprising; the tri-winged rotary knife structure of any one of claims 1-4; at least one split guide for stabilizing the drill rod driving the tri-winged rotary knife structure during cutting.
6. 6. The system for deep well drill rod internal cutting according to claim 5, wherein the split guide comprises two split guide plates (6) capable of being butted into a whole, each split guide plate (6) comprises a guide semicircular plate (601), a guide wing plate (602) connected with the guide semicircular plate (601) and a guide wheel mounting hole (606) formed in the guide semicircular plate (601), the split guide further comprises a guide wheel (9) mounted in the guide wheel mounting hole (606) through a vertical bolt (7), and a transverse bolt (8) used for connecting the two split guide plates (6).
7. 7. The system for deep well drill pipe cutting according to claim 5, wherein the split guide plate (6) further comprises a guide slurry through hole (607) formed in the guide semicircular plate (601).
8. 8. The system for deep well drill pipe cutting according to claim 5, wherein the guide wheel (9) is made of rubber.
9. 9. A method of using the system of any one of claims 5-8 to make deep well drill pipe cuts, comprising the steps of; S1, designing and manufacturing a cutter disc comprising a three-wing rotary blade (3), and performing an indoor cutting test to verify and optimize the design; s2, preparing a site operation site and related equipment; S3, maintaining and repairing related parts of the drilling machine; S4, installing the three-wing rotary knife (3); S5, the assembled three-wing rotary knife structure and at least one split type guide are lowered to a preset cutting position in a drill rod, wherein the split type guide is arranged at a specific position for driving the drill rod; S6, starting cutting operation, namely, initially adopting a low rotation speed, and gradually increasing to a working rotation speed after the system is stable; S7, after cutting for a period of time, retracting the cutter in a low-rotation-speed forward rotation and inching mode; s8, lifting the drill rod at a constant speed, and monitoring the lifting process; S9, checking the cutting depth and the cutter abrasion condition, and repeating the steps S4 to S9 if the cutting depth and the cutter abrasion condition are not completely cut off; and S10, after cutting is finished, the site is collected.
10. 10. The method for deep well drill pipe internal cutting according to claim 9, wherein in step S5, the installation position of the split guide is calculated and determined by the following steps; Obtaining basic parameters including mud properties, drill pipe parameters, cutter parameters and material properties; calculating a fluid excitation force generated when the three-wing rotary knife (3) rotates in a slurry environment based on the basic parameters; simplifying the drill rod into a beam model with a fixed top and a concentrated mass at the bottom, and calculating the vibration amplitude of a cutter when no guide exists; According to the first-order and second-order vibration mode characteristics of the drill rod, the installation position of the guide device capable of effectively inhibiting main vibration is determined.

Description

Three-wing rotary knife structure, system and construction method for cutting in drilling method sinking deep well drill rod Technical Field The invention relates to the technical field of drilling mechanical engineering, in particular to a three-wing rotary cutter structure, a system and a construction method for cutting in a drilling rod of a well drilling deep well by a drilling method. Background Along with the advancement of coal resources to deep, the coal industry has higher requirements on the depth and efficiency of well construction. The traditional well construction method comprises a grouting method, a drilling and blasting method and the like, and the construction method has the defects of high construction operation intensity, poor safety and the like, and cannot meet the requirements of few people and safety in new times of well construction. The special method for well sinking comprises a freezing method, a drilling method and the like, the freezing method firstly needs to freeze stratum by using a refrigerant to increase the strength and the impermeability of the stratum, then a drilling and blasting method is used for well sinking, power equipment and constructors of the drilling method are all on the ground, do not need to go deep into the well, and the well is dug in a decompression drilling and slurry well-flushing mode, so that the method has the advantages of high mechanization degree, good construction environment, good well-forming quality and the like. However, when drilling the western dwarf stratum, engineering problems such as serious drill bit shaking and the like occur, and the risk of drill rod fracture is increased. Therefore, how to quickly cut the pipe structure at the bottom of the well after the drill rod is broken is a key ring for improving the efficiency of fishing the drill bit at the bottom of the well. However, research on tools and methods for cutting deep drill pipes at home and abroad has been focused on the petroleum drilling industry, and there are few precedents for cutting drill pipes from inside drill pipes. Moreover, the drilling method well drilling mechanical components, the stratum crossing, the slurry environment and the like are also greatly different from the petroleum drilling industry, and the drill rod cutting tool and the process cannot be directly used as reference. Therefore, the invention provides a three-wing rotary knife structure, a system and a construction method for cutting in a drilling method sinking deep well drill rod, and aims to solve the existing technical problems. Disclosure of Invention The invention mainly aims to provide a three-wing rotary knife structure, a system and a construction method for cutting in a drilling rod of a well sinking deep well by a drilling method, and aims to solve the existing technical problems. In order to achieve the above purpose, the invention provides a three-wing rotary cutter structure for cutting in a drilling rod of a well drilling method sinking deep well, which comprises the following steps of; A cutter head drill rod joint; the cutter head is connected with the cutter head drill rod joint and comprises an upper cutter shell, a lower cutter shell and a plurality of wing plates for connecting the upper cutter shell and the lower cutter shell, and the cutter shells are provided with mounting holes; The three-wing rotary cutters are arranged in a plurality of mounting holes of the cutter shell in a rotatable mode through cutter shafts and can rotate around the cutter shafts and revolve around the center of the cutter disc under the driving of external force, and each three-wing rotary cutter comprises a cutter body, a cutter plate fixed on the cutter body and a plurality of cutter teeth mounted on the cutter plate. Further, the plurality of cutter teeth are staggered in a radial direction on the cutter plate. Further, the cutter teeth are made of YS2T/325 alloy. Further, the cutter plate is provided with a plurality of grooves for installing the cutter teeth, and the cutter teeth are fixed in the grooves in a brazing mode. A system for deep well drill rod cutting is characterized by comprising; the three-wing rotary knife structure; at least one split guide for stabilizing the drill rod driving the tri-winged rotary knife structure during cutting. Further, the split type guide comprises two split type guide plates which can be butted to form a whole, each split type guide plate comprises a guide semicircular plate, a guide wing plate connected with the guide semicircular plate and a guide wheel mounting hole formed in the guide semicircular plate, and the split type guide further comprises a guide wheel mounted in the guide wheel mounting hole through a vertical bolt and a transverse bolt used for connecting the two split type guide plates. Further, the split guide disc further comprises a guide slurry through hole formed in the guide semicircular plate. Further, the guide wheel is made of rub