Wax deposition prevention device for oil production well

Abstract

The invention discloses a wax deposition prevention device for oil production well. The wax deposition prevention device comprises a plurality of heatable oil pipes communicating with one another through connecting nut sleeves, each heatable oil pipe comprises an inner oil pipe body, an electric heating layer pasted to the inner oil pipe body and a sleeve, the sleeves are connected with the inneroil pipe bodies, and an annular end cover is arranged at the two ends of each sleeve. Each annular end cover is provided with a plurality of annularly-distributed first electric inserting pieces, theelectric heating layers are composed of a plurality of electric heating film strips, the electric heating film strips are distributed in the axis extending direction of the inner oil pipes, and the two poles of each electric heating film strip are correspondingly connected with the corresponding first electric inserting pieces through wires. When the adjacent heatable oil pipes are connected, thefirst electric inserting piece positioned at the bottom of the upper heatable oil pipe and the first electric inserting piece positioned at the top of the lower heatable oil pipe are correspondingly in contact connection with corresponding second electric inserting pieces positioned on the corresponding connecting nut sleeves. The wax deposition prevention device is good in wax deposition prevention effect, does not interfere with the oil extraction process, can improve an existing oil pipe, and is good in applicability.

Description

technical field [0001] The invention relates to the technical field of wax removal in oil production, in particular to an anti-wax deposition device for oil production wells. Background technique [0002] The process of crude oil extraction is the process of lifting the crude oil in the formation to the ground. Generally, under oil layer conditions, crude oil contains a certain amount of wax, and these waxy components are in a dissolved state. During the production process, if the external temperature is too low, the crude oil will be lifted with the decrease of temperature and pressure and the precipitation of gas. , the dissolved paraffin will be crystallized and precipitated. When the amount of paraffin crystals precipitated increases, the crystals will grow up, gather and deposit on the tube wall, which is the so-called waxing phenomenon. Wax deposition will reduce the diameter of the oil outlet pipeline or even block it, thereby reducing or shutting down the production...

AI Technical Summary

Problems solved by technology

The traditional methods to solve the problem of wax deposition on the tubing wall during the oil production process are: (1) wash the well with chemical solvents, (2) use a mechanical device to extend into the tubing to scrape the wax, (3) lift the tubing head out of the well for cleaning, using these methods The direct cost of washing the well is as high as 30,000 yuan, and it has to be carried out under the condition of shutdown

In recent years, there have been various devices that use electric heating to remove wax, but the oil yield will be affected to some extent during use, and major changes in the existing structure are required. The applicability is poor, and it is not easy to install.

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