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Series-connected short section of drill rod for horizontal well deflecting

A horizontal well and tandem technology, applied in the direction of drill pipes, drill pipes, drilling equipment, etc., can solve the problems of low work efficiency, high frictional torque, troublesome replacement of drill pipe pup joints, etc., to improve work efficiency, The effect of reducing the difficulty of drilling

Pending Publication Date: 2021-04-13
JILIN PETROLEUM EQUIP & TECH ENG SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the invention is to solve the problems of troublesome replacement of drill pipe pup joints, large frictional torque, and low working efficiency.

Method used

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  • Series-connected short section of drill rod for horizontal well deflecting
  • Series-connected short section of drill rod for horizontal well deflecting
  • Series-connected short section of drill rod for horizontal well deflecting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] like Figure 1~2 , Figure 5 and Figure 10 As shown, a tandem pup joint used for drilling pipes for deflection in horizontal wells, including a male joint 2 with a straight rod section at the front and a ball head at the back, and a lock sleeve 6 with a spherical cavity at the front end to accommodate the ball head , and the outer casing 3 that is sleeved on the outside of the end of the straight rod section of the male joint 2 and forms an annular end cap at the front end of the ball head to clamp the ball head. The rear part of the outer shell 3 is a cylindrical shell, which is fixed and socketed on the outside of the lock sleeve 6 by the first hexagon socket flat end set screw. The male joint and the locking sleeve are provided with a through central hole. The rear part of the central hole of the male joint 2 gradually expands into a bell mouth, in order to meet the universal supply of drilling fluid in the central hole, because the male joint 2 and the lock slee...

Embodiment 2

[0032] like Figure 1~2 , Figure 5 and Figure 10 As shown, a tandem pup joint used for drilling pipes for deflection in horizontal wells, including a male joint 2 with a straight rod section at the front and a ball head at the back, and a lock sleeve 6 with a spherical cavity at the front end to accommodate the ball head , and the outer casing 3 that is sleeved on the outside of the end of the straight rod section of the male joint 2 and forms an annular end cap at the front end of the ball head to clamp the ball head. The rear part of the outer shell 3 is a cylindrical shell, which is fixed and socketed on the outside of the lock sleeve 6 by the first hexagon socket flat end set screw. The male joint and the locking sleeve are provided with a through central hole. The rear part of the central hole of the male joint 2 gradually expands into a bell mouth, in order to meet the universal supply of drilling fluid in the central hole, because the male joint 2 and the lock slee...

Embodiment 3

[0037] Such as Figure 1~2 , Figure 5 and Figure 10 As shown, a tandem pup joint used for drilling pipes for deflection in horizontal wells, including a male joint 2 with a straight rod section at the front and a ball head at the back, and a lock sleeve 6 with a spherical cavity at the front end to accommodate the ball head , and the outer casing 3 that is sleeved on the outside of the end of the straight rod section of the male joint 2 and forms an annular end cap at the front end of the ball head to clamp the ball head. The rear part of the outer shell 3 is a cylindrical shell, which is fixed and socketed on the outside of the lock sleeve 6 by the first hexagon socket flat end set screw. The male joint and the locking sleeve are provided with a through central hole. The rear part of the central hole of the male joint 2 gradually expands into a bell mouth, in order to meet the universal supply of drilling fluid in the central hole, because the male joint 2 and the lock s...

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Abstract

The invention discloses a series-connected short section of a drill rod for horizontal well deflecting. The series-connected short section comprises a transmission part and a bearing supporting part relative to a horizontal well. The transmission part comprises a male connector (2), a lock sleeve (6), an outer shell (3) and a butt joint (11), wherein the bearing supporting part comprises a bearing fixed to any position outside the short section of the drill rod in a surrounding mode. Torque is transmitted through clamping circumferential limiting of the male connector and the lock sleeve, and axial limiting is formed through rotary connection of the butt joint detachably fixed to the outer portion of the lock sleeve and a straight rod part at the front end of the male connector to prevent the short section of the drill rod from moving. A ball head on the rear portion of the male connector is universally connected with the lock sleeve to guarantee that the short section of the drill rod rotates to a certain angle to complete deflecting operation of the horizontal well. The series-connected short section adapts to the trend of the well wall, overcomes resistance of the well wall and guarantees stable drilling. The bearing abutting against the horizontal well wall is arranged outside the series-connected short section, sliding resistance is changed into rolling resistance, and friction torque borne by the drill rod is reduced.

Description

technical field [0001] The invention relates to the field of design and manufacture of drilling tools for horizontal wells, and more specifically relates to a tandem nipple used for drilling pipes for deflecting horizontal wells. Background technique [0002] Horizontal wells are special wells whose maximum inclination reaches or approaches 90° (generally not less than 86°), and maintains a certain length of horizontal well section in the target layer. Sometimes for some special needs, the inclination angle can exceed 90°, "upward warping". Generally speaking, horizontal wells are suitable for thin oil and gas layers or fractured oil and gas reservoirs, with the purpose of increasing the exposed area of ​​oil and gas layers. In the process of drilling, in order to adapt to the direction of the well wall, the drill pipe should be rotated at a certain angle, and it is necessary to overcome the resistance of the well wall to ensure smooth drilling. Among them, the pup joint o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/05
CPCE21B17/05
Inventor 刘显涛王思敏郭相龙张淼
Owner JILIN PETROLEUM EQUIP & TECH ENG SERVICE