Self-pushed type radial horizontal well steering device

A steering device and horizontal well technology, applied in directional drilling, drilling equipment, drilling automatic control system, etc., can solve problems such as increased operating costs, the length of the horizontal section cannot reach the predetermined depth, and the effect of increasing production is not obvious, so as to avoid Milling and reaming of casing segments, reducing operating costs and increasing length

Inactive Publication Date: 2012-10-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Traditional radial horizontal well technology requires complex processes such as casing section milling and large-diameter reaming, which increases operating costs; during radial horizontal drilling, it is difficult to bend and turn the high-pressure drill pipe, and the length of the horizontal section cannot reach the predetermined depth. The effect of increasing production is not obvious

Method used

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  • Self-pushed type radial horizontal well steering device
  • Self-pushed type radial horizontal well steering device
  • Self-pushed type radial horizontal well steering device

Examples

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Embodiment Construction

[0011] In the drawings, the steering device is connected to the oil pipe through the joint 2. There is a rectangular deep groove 20 on the device body to accommodate the reversing valve and the connection hole A 1 and hole A 2 , exit B 1 and hole B 2 , export C 1 , Hole C 2 and hole C 3 , Kong D 1 and hole D 2 , import N 1 and hole N 2 high pressure hose. In the piston cylinder assembly 3C, the labyrinth seal 9 ensures that the flow channel 6 and the flow channel 7 are connected to the hole N respectively. 2 and hole D 2 , Hole A 2 and hole O 2 without interfering with each other. The three wing plates located at the lower end of the piston rod and the corresponding three limit grooves on the inner wall of the cylinder ensure that the piston does not rotate during the reciprocating motion, so that the flow channel 5 and the flow channel 6 at the upper end of the piston rod are in line with the hole N 2 , Hole A 2 , hole O 2 , Kong D 2 During the reciprocating...

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Abstract

The invention relates to a self-pushed type radial horizontal well steering device which is applicable to the fields of transformation of gasoline, natural gas and coalbed methane drilled wells and reservoirs. The self-pushed type radial horizontal well steering device comprises a steering valve, a stroke switch, a piston cylinder assembly, an automatic clamping mechanism, a connector and a steering track and is characterized in that the steering valve is composed of a valve body and a valve core; the stoke switch comprises a runner and a filling block arranged on the upper end of a piston rod; the piston cylinder assembly is mainly composed of a cylinder body, a piston, a wing plate and a limiting groove; the automatic clamping mechanism comprises a spring, a small piston, a rubber block and a pressing cap; the piston automatically holds a high pressure drilling tube tightly when traveling downwards to be fed, and releases vice versa; the connector is used for connecting the high pressure chambers where the piston and the automatic clamping mechanism are located; two flow passages above the connector control the feeding speed; the steering track provides a passage for steering of the high pressure drilling tube inside a casing, so that the complex processes of the milling of a casing section and hole expansion are avoided; the working risk is reduced; and the length of a horizontal section is increased effectively.

Description

Technical field: [0001] The invention relates to a self-propelled radial horizontal well steering device, which is suitable for oil, natural gas and coal bed methane drilling and reservoir transformation, and the field of increasing oil and gas and coal bed methane output. Background technique: [0002] Mature oilfields have entered the late stage of development, and the key to untapping potential and stabilizing production is to exploit heavy oil, thin oil layers, and low-permeability oil layers and other hard-to-use reserves; in addition, due to the characteristics of low pressure, low permeability, and low adsorption gas saturation of my country's coalbed methane reservoirs, coalbed methane The low daily production and fast decline rate of gas wells have also become problems to be solved urgently. Radial horizontal well technology is the product of the in-depth development of horizontal wells to enhance the recovery and production of crude oil and coalbed methane. Its not...

Claims

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Application Information

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IPC IPC(8): E21B7/04E21B44/00
Inventor 周卫东王瑞和师伟李罗鹏
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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