Flexible drill pipe for radial horizontal rotary drilling
A horizontally rotating, flexible drill pipe technology, applied in the direction of drill pipe, drilling equipment, drill pipe, etc., can solve the problems of short service life, poor strength and wear resistance, etc., achieve long service life, good wear resistance, avoid drill pipe damage effect
Inactive Publication Date: 2018-11-16
CNPC GREATWALL DRILLING ENG
View PDF5 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
It overcomes the disadvantages of poor strength, wear resistance and short service life of existing flexible drill pipes
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0014] Such as figure 1 , figure 2 , image 3 As shown, a flexible drill pipe for radial and horizontal rotary drilling includes an upper drill pipe joint 1 and a lower drill pipe joint 11; Connected to the inside of the lower end of the central tube 8, the combination of the three forms the drilling fluid passage of the flexible drill pipe, which is used to transport high-pressure drilling fluid, and is connected with other tools to form the drilling fluid circulation system of the entire drilling system. The central tube 8 is made of high-pressure plastic tube, the outer side of the central tube 8 is covered with a support tube 7, and the support tube 7 is made of stainless steel braided metal tube. The support tube 7 protects the central tube 8 inside, assists pressure bearing, and plays the role of supporting the sheath externally. The outer side of the support tube 7 is equipped with a wear-resistant sleeve 5, which is formed by connecting a plurality of single section...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to the technical field of radial horizontal well drilling, in particular to a flexible drill pipe for radial horizontal rotary drilling. According to the flexible drill pipe forradial horizontal rotary drilling, the lower end of an upper joint of a drill pipe body is inserted into the upper end of a central pipe, the upper end of a lower joint of the drill pipe body is inserted into the lower end of the central pipe, the central pipe adopts a high-pressure plastic pipe, the outer side of the central pipe is sleeved with a supporting pipe, and the supporting pipe adopts astainless steel braided metal pipe. The outer side of the supporting pipe is sleeved with an anti-abrasion sleeve, and the anti-abrasion sleeve is formed by successively connecting a plurality of sheath single sections. According to the flexible drill pipe, the strength is high, the flexibility is good, torque and drill pressure can be effectively transmitted, the functions of withstanding tension, compression and torsion are achieved, the drilling fluid circulation is completed, the flexible drill pipe can smoothly pass through a guider, a reliable drilling direction is ensured, good abrasion resistance and fatigue resistance are achieved, a long service life under the action of large curvature pressure, twist and tension can be ensured, and the occurrence of complicated downhole conditions such as drill pipe damage, breakage, falling off and jamming of a drilling tool can be effectively prevented.
Description
Technical field: [0001] The invention relates to the technical field of radial and horizontal well drilling, in particular to a flexible drill pipe for radial and horizontal rotary drilling. Background technique: [0002] Radial horizontal rotary drilling technology is an emerging oilfield stimulation technology in recent years. This technology is based on conventional drilling technology and high-pressure water jet radial horizontal well drilling technology. The extremely small radius of curvature is drilled radially into the formation from the existing main wellbore, and multiple radial horizontal wellbores are drilled at different depths and in different orientations in the formation. In the existing radial and horizontal rotary drilling technology, tools such as drill bits, flexible drill pipes, and power drilling tools are usually sent downhole by using the logging drawworks cable. The main function of the flexible drill pipe is to transport high-pressure drilling fluid...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/20
CPCE21B17/20
Inventor 韩龙施连海朱忠伟徐涛杨帆赵敏刘平全黄志强张昕冉李磊兵胡可能朱高磊张秋阳韩冬
Owner CNPC GREATWALL DRILLING ENG