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Novel fracturing pitching sliding sleeve

A ball-pitching sliding sleeve and fracturing technology, which is applied in the direction of production fluid, wellbore/well components, earthwork drilling and production, etc., can solve the problems of low erosion resistance of sliding sleeve, erosion deformation of To solve problems such as layer fracturing construction, achieve strong erosion resistance, improve erosion resistance, and meet the requirements of on-site construction

Pending Publication Date: 2022-02-25
CHINA PETROCHEMICAL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the staged fracturing process of horizontal wells, the self-locking sliding sleeve is used as a stratification control switch. The fluid with high sand content will strongly erode the inner wall of the sliding sleeve. If the erosion resistance of the sliding sleeve is not good High, it is very likely that the cone surface of the sliding sleeve will be eroded and deformed, and an effective seal cannot be formed after the ball is thrown, and the sliding sleeve will fail to open, seriously affecting the normal operation of layered fracturing

Method used

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  • Novel fracturing pitching sliding sleeve
  • Novel fracturing pitching sliding sleeve
  • Novel fracturing pitching sliding sleeve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A new type of fracturing pitching sliding sleeve, including a sliding sleeve base made of QT500 ductile iron material, and the sliding sleeve base is coaxially provided with a flow channel inlet, a ball seat sealing surface, and a flow channel from top to bottom. The outlet, the inlet of the flow channel and the outlet of the flow channel are two opposite cones, and the inner wall of the inlet of the flow channel is provided with a guide part.

[0027] The guide part is a spiral flute, and the spiral flute extends from the upper edge of the flow channel inlet to the edge of the ball seat sealing surface. The taper of the flute is the same as the taper of the inlet of the flow channel, which is 22°.

[0028] The inlet of the flow channel is a 22° conical hole. The outlet of the flow channel is a 60° tapered hole. The sealing surface of the ball seat is a spherical arc sealing surface. The surface of the flow channel inlet, the flow channel outlet and the sealing surfa...

Embodiment 2

[0030] A new type of fracturing pitching sliding sleeve, including a sliding sleeve base made of QT500 ductile iron material, and the sliding sleeve base is coaxially provided with a flow channel inlet, a ball seat sealing surface, and a flow channel from top to bottom. The outlet, the inlet of the flow channel and the outlet of the flow channel are two opposite cones, and the inner wall of the inlet of the flow channel is provided with a guide part.

[0031] The guide part is a spiral groove, and the spiral groove extends from the upper edge of the flow channel inlet to the upper edge of the ball seat sealing surface, and the cross-sectional shape of the spiral groove is a semicircle, an oblique triangle or other shapes conforming to fluid mechanics. The inlet of the flow channel is a 22° conical hole. The outlet of the flow channel is a 60° tapered hole. The sealing surface of the ball seat is a spherical arc sealing surface. The surface of the flow channel inlet, the flow...

Embodiment 3

[0033] In the staged fracturing process, when fracturing the well section below the sliding sleeve, the size of the balls thrown is 1.75 inches, for example, and the diameters of the balls are all smaller than the diameter of the 22° conical hole 1. It can enter the ball arc sealing surface 2 through the 22° conical hole 1 for sealing. At this time, the ball will cooperate with the ball arc sealing surface 2 to form a seal. Since the ball sealing form is improved from a line seal to a surface seal, its sealing ability is greatly improved. Improve the reliability of fracturing, and then press it to the required pressure through the ground pump truck system, so as to realize the fracturing of this section of formation and realize the fracturing of this section of formation.

[0034] In this embodiment, the base material of the sliding sleeve is casted with QT500 ductile iron.

[0035] In this embodiment, the flow channel of the sliding sleeve adopts the flow channel structure of...

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Abstract

The invention relates to the field of downhole operation tools and particularly relates to a novel fracturing pitching sliding sleeve. A sliding sleeve runner inlet adopts a 22-degree conical surface taper hole, a ball seat sealing surface adopts a runner structure of a ball arc sealing surface, a guide part is arranged in the runner inlet, a thrown ball rotates when falling through the guide part, impurities between contact surfaces are cleaned, an ion nitriding layer is arranged on the surface of an internal runner, and a 60-degree taper hole is formed in a sliding sleeve runner outlet; and thickness of the ion nitriding layer does not exceed 400 microns. The sliding sleeve has advantages of being high in erosion resistance, high in sealing performance and reliable in sealing performance, and the site construction requirement of the fracturing sliding sleeve is met.

Description

technical field [0001] The invention relates to the field of downhole operation tools, in particular to a novel fracturing ball sliding sleeve. [0002] technical background [0003] Horizontal well staged fracturing technology has become an important means of increasing oil and gas production today, and it is an effective production method for developing low-permeability reservoirs. Sleeve erosion resistance, the first starting point to improve the erosion resistance is the material, structure and surface treatment process of the fracturing sleeve. [0004] As the core hardware of open-hole staged fracturing technology for horizontal wells, the fracturing sleeve, as an important part of the staged fracturing tool for horizontal wells, plays a vital role in the multi-stage fracturing process. Its erosion resistance and sealing performance The quality of fracturing directly affects the effect of fracturing construction. [0005] In the staged fracturing process of horizontal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B34/14
CPCE21B43/26E21B34/14
Inventor 曹婧马明新张建国魏新芳高凯马庆涛张磊齐志刚陈阳
Owner CHINA PETROCHEMICAL CORP