CN-121993103-A - Mud scraping method for inner wall of drill rod

CN121993103ACN 121993103 ACN121993103 ACN 121993103ACN-121993103-A

Abstract

The invention provides a method for scraping mud on the inner wall of a drill rod, which comprises the steps of arranging a drill rod lifting device on a drilling platform, lifting the drill rod, placing the mud scraping device into the drill rod, falling down for scraping the mud, braking and fixing the mud scraping device by an anchor assembly when a stroke assembly detects that the mud scraping distance reaches the set distance, lifting again after the lifted drill rod is disassembled, releasing the brake by the anchor assembly, falling down again for scraping the mud by the mud scraping device, and repeating the steps until the mud scraping is completed, and taking out the mud scraping device. The invention has the advantages that the self gravity of the mud scraping device is adopted to enable the mud scraping device to fall down to scrape mud on the inner wall of the drill rod, the mud scraping distance can be monitored, and the falling risk is avoided.

Inventors

XU JIANCHAO
LIU TIANYU
HE CHAO
LI ZHILIN
YANG XIAOFENG
LIU KE
LI WEICHENG
JIA LICHUN
LU QI
CHEN TAO

Assignees

中国石油天然气集团有限公司
中国石油集团川庆钻探工程有限公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (10)

1. The method is characterized in that a mud scraping device with an anchoring mechanism is used for scraping mud on the inner wall of the drill rod, the anchoring mechanism is arranged on the mud scraping device and comprises a stroke component capable of measuring the mud scraping distance and an anchoring component capable of braking and fixing the mud scraping device on the inner wall of the drill rod; the method comprises the following steps: s1, arranging a drill rod lifting device on a drilling platform to lift a drill rod; S2, placing the mud scraping device into a drill rod, and falling to perform mud scraping operation; S3, when the stroke component detects that the mud scraping distance reaches a set distance, the anchoring component brakes and fixes the mud scraping device; S4, after the lifted drill rod is detached, lifting again, releasing the brake by the anchor assembly, and enabling the mud scraping device to fall down again for mud scraping operation; S5, repeating the steps S1-S4 until the mud scraping is completed, and taking out the mud scraping device.
2. The method for scraping mud on the inner wall of the drill rod according to claim 1, wherein the travel assembly comprises support frames which are arranged in a V shape, a reset spring is arranged between the support frames, a compression counter is arranged on the reset spring, one end of each support frame is rotatably connected with the inner wall of the mud scraping device, a travel wheel is arranged at the other end of each support frame, the travel wheel extends out of the outer surface of the mud scraping device to be in contact with the inner wall of the drill rod, a permanent magnet is arranged at the outer edge of each travel wheel, a Hall sensor is arranged on each support frame, the anchoring assembly comprises a magnetic slip, a compression spring and an electromagnet, the compression spring and the electromagnet are located in the mud scraping device, the electromagnet is located in the compression spring, the magnetic slips are arranged at two ends of the compression spring which are arranged in a radial direction, the electromagnet is powered on/off, the magnetic slip is retracted into/extended out of the outer surface of the mud scraping device, and braking/braking of the mud scraping device is released and fixed on the inner wall of the drill rod.
3. The method for scraping mud on the inner wall of the drill rod as set forth in claim 2, wherein a bearing is provided at one end of the support frame connected to the mud scraping device.
4. A method for scraping mud on the inner wall of a drill rod according to claim 2 or 3, wherein the left end and the right end of the return spring are respectively connected with a fixed column, and the fixed columns are arranged on the supporting frame.
5. The method for scraping mud on the inner wall of the drill rod according to claim 2, wherein the electromagnetic iron is connected with a control circuit, the control circuit can control the electromagnet to be powered on/off, the control circuit is in communication connection with the compression counter and the Hall sensor, and the mud scraping distance of the mud scraping device can be set through the control circuit.
6. The method for scraping mud on the inner wall of the drill rod according to claim 2, wherein the stroke wheel comprises a rubber wheel, and anti-slip teeth are arranged on the outer edge of the stroke wheel.
7. The method for scraping mud on the inner wall of the drill rod according to claim 2, wherein the Hall sensor is arranged in the middle of the support frame, and the return spring is arranged in the middle of the support frame.
8. The method for scraping mud on the inner wall of a drill rod according to claim 2, wherein the outer surface of the magnetic slip is provided with an anti-slip groove.
9. The method for scraping mud on the inner wall of the drill rod according to claim 2, wherein a travel limit groove is formed in the wall surface of the mud scraping device, and the travel wheel and the support rod can extend out of the travel limit groove.
10. The method of claim 2, wherein the travel assembly is positioned above the anchor assembly and a sealing plug is positioned between the travel assembly and the anchor assembly.

Description

Mud scraping method for inner wall of drill rod Technical Field The invention relates to the technical field of petroleum and natural gas drilling engineering, in particular to a mud scraping method for the inner wall of a drill rod. Background In the drilling process of an oil-gas well, various working conditions such as drilling tool changing, short lifting, well dredging and the like relate to the lifting operation, in order to keep the safety of driller operation and clean of the drilling floor, the drill rod is usually required to be cleaned in the lifting process, and the outer wall of the drill rod is cleaned at present, however, due to the lack of the inner wall cleaning technology of the drill rod, the slurry on the drilling floor is still spread in the lifting process. In actual production process, the operating personnel often use the pontoon mud scraping device to scrape mud to the drilling rod inner wall, will scrape the mud device promptly and place into the drilling rod in, scrape the mud device and float on mud in the drilling rod, keep motionless on the mud surface, then hoisting accessory lifts by crane the drilling rod, makes drilling rod and scrape the mud device and form relative motion, reaches and scrapes the mud effect. However, the mud scraping effect of the pontoon mud scraping device is poor, the proportion between the self gravity and the mud buoyancy is not well controlled, the mud concentration change can seriously influence the mud scraping effect of the mud scraping device, the mud scraping device can possibly fall down, and the position of the mud scraping device in a drill rod cannot be known. Therefore, the method for scraping the mud on the inner wall of the drill rod has important significance. The application number is CN201610834534.3, chinese patent entitled "a crisscross inverted groove type drilling rod inner wall mud scraper", this mud scraper includes the core pipe, scraping blade group and float bowl, the core pipe is hollow standpipe, the scraping blade group comprises the scraping blade that circumference equidistance distributes around the core pipe, the scraping blade group is two-layer along core pipe axis direction upper and lower distribution, the scraping blade of adjacent scraping blade group is crisscross to be distributed, the scraping blade side view is the inverted groove form of downward open-ended bilateral symmetry, the inner edge of these symmetrical left and right sides scraping blade is respectively through support arm and core pipe outer wall connection, scraping blade group looks up the inner edge and outer fringe and is concentric circles, float bowl is the container that has the upper opening of area end, float bowl upper opening and core pipe lower opening link to each other through the screw thread, core pipe upper opening has the shutoff through threaded connection, inverted groove formula scraping blade can make drilling fluid assemble into flow down more easily, moreover, more easily pass through drilling rod joint department. However, the mud scraper is suspended on the surface of the drilling fluid under the action of the pontoon, the proportion between the self gravity and the mud buoyancy is poor, the cleaning and mud scraping effect is unstable, and once the buoyancy is lost, the mud scraper is easy to directly fall into the well, so that the fish is caused. Disclosure of Invention The present invention is directed to solving one or more of the problems of the prior art, including the shortcomings of the prior art. For example, one of the purposes of the present invention is to provide a method for scraping mud on the inner wall of a drill pipe, which uses the self gravity drop of a mud scraping device to scrape mud on the inner wall of the drill pipe, can monitor the scraping distance, can perform deceleration braking fixation according to a set stroke length, has high mud scraping efficiency, and has no falling risk. In order to achieve the purpose, the invention provides a method for scraping mud on the inner wall of a drill rod, which can adopt a mud scraping device with an anchoring mechanism to scrape mud on the inner wall of the drill rod, wherein the anchoring mechanism is arranged on the mud scraping device and comprises a travel component capable of measuring the mud scraping distance and an anchoring component capable of braking and fixing the mud scraping device on the inner wall of the drill rod, the method comprises the following steps of S1, arranging a drill rod lifting device on a drilling platform to lift the drill rod, S2, placing the mud scraping device into the drill rod to fall down for mud scraping operation, S3, braking and fixing the mud scraping device by the anchoring component when the travel component detects that the mud scraping distance reaches a set distance, S4, lifting again after the lifted drill rod is detached, releasing the braking of the anchoring component, and the mud scraping device falls