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Method and special tool for sand flushing

A special tool and sand washing technology, which is applied in the field of workover operations, can solve the problems of low sand washing efficiency and inability to realize rotary drilling, so as to improve sand washing efficiency, reduce the risk of sand washing pipe sticking, and reduce construction environmental pollution Effect

Active Publication Date: 2017-02-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the risk of drill sticking in the conventional sand washing technology, the existing continuous sand washing device cannot realize the rotary drilling, and the defects of low sand washing efficiency, and provide a safe and efficient continuous sand washing method and a dedicated tool

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Depend on figure 1 , figure 2 As shown, a special tool for sand washing includes an outer pipe and an inner pipe for sand washing. The outer pipe is formed by screwing the oil pipe 6, the suspension nipple 2 and the rotating outer cylinder 3 sequentially. The inner pipe is made of the sealing nipple 1, the flushing pipe 5 , The rotating inner cylinder 4 and the drill bit 7 are threaded in sequence.

[0025] The central through hole of the suspension sub-section 2 is a tapered seat, and the upper and lower ends of the suspension sub-section 2 are provided with connecting threads.

[0026] The rotating outer cylinder 3 is a tubular structure, the lower port is a guide shoe, and at least two longitudinal bar-shaped transmission keys 301 are provided in the central through hole.

[0027] The sealing nipple 1 is composed of an upper joint 101, a c...

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Abstract

The invention relates to a method and special tool for sand flushing, and belongs to the technical field of well repairing work. The method and special tool for sand flushing are suitable for sand flushing construction of a pitshaft of an oil-gas well. The special tool for sand flushing comprises an outer pipe and a sand flushing inner pipe. The outer pipe is formed by sequentially connecting an oil pipe, a suspension pup joint and a rotary outer cylinder in a threaded mode. The sand flushing inner pipe is formed by sequentially connecting a sealing pup joint, a flushing pipe, a rotary inner cylinder and a drill bit in a threaded mode. According to the method and special tool for sand flushing, the annular space between the flushing pipe and the outer pipe is sealed through the sealing pup joint, a sand flushing fluid circulating channel between the outer pipe and the sand flushing inner pipe is established, and direct-circulating and reverse-circulating sand flushing construction in the sliding state of the flushing pipe is achieved; and rotating power for matching between the outer pipe and the ground is transmitted through the rotary inner cylinder and the rotary outer cylinder, the sand flushing drill bit is driven to rotate, and thus the rotary-drilling sand flushing construction requirement under a complex well condition is met.

Description

technical field [0001] The invention relates to a sand washing method and a special tool, which belong to the technical field of workover operations and are suitable for the sand washing construction of oil, gas and water wells. Background technique [0002] During the production process of oil, gas and water wells, due to sand production in the formation or sand filling by technological measures, the sand column in the wellbore will bury the target layer, resulting in a decrease in oil well production or an increase in water injection pressure, affecting the normal production of oil and water wells. Sand washing is to use the supporting pipe strings, tools, equipment and high-speed flowing workover fluid to break and disperse the sand column in the wellbore, and carry it out of the ground with the circulation of the workover fluid, so as to remove the sand accumulated in the wellbore. A method of restoring and increasing well production or water injection. [0003] The con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/00E21B33/03
CPCE21B21/00E21B33/03
Inventor 王飞周会刚王江顺王志涛吴静王东宁顺康李中华
Owner CHINA PETROLEUM & CHEM CORP
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