Solid polymer slow-release paraffin control ball and preparation method and use method thereof

Abstract

The invention provides a solid polymer slow-release paraffin control ball and a preparation method and a use method thereof. The solid polymer slow-release paraffin control ball is formed by a high-molecular polymer, a surfactant, a density regulator and an oil auxiliary agent through high-temperature and high-pressure blending injection molding, and paraffin precipitation of a wellbore pipe rod of a producing well is delayed and prevented through the combined action of the high-molecular polymer and the surfactant, the high-molecular polymer has a long-chain alkyl structure similar to a wax molecule, and a polar chain link part of the high-molecular polymer enables a wax crystal and a crystal form to be distorted, so that the wax crystal is prevented from continuously depositing and growing; and the surfactant is adsorbed on the wax crystal surface or the wax precipitation surface, so that the polarity of the wax crystal surface is reversed, and the wax control effect is achieved. Thesolid polymer slow-release paraffin control ball is periodically and quantitatively added into an oil jacket annulus from a wellhead manually or in cooperation with automatic filling equipment, can directly reach an oil layer or a designed position, slowly and stably releases effective components in the oil well produced liquid soaking process, prolongs the paraffin removal period, reduces the oil well production cost, and guarantees the production efficiency and the crude oil yield.

Description

technical field [0001] The invention belongs to the technical field of wax deposition prevention and control in well bores of oil production wells, and in particular relates to a solid polymer slow-release anti-wax ball, a preparation method and a use method thereof. Background technique [0002] In the process of oil production, when the temperature of crude oil drops to a certain level, tiny wax crystals will be precipitated, and the wax crystals will combine with each other to form a three-dimensional network space structure, and paraffin will continue to crystallize and accumulate on downhole equipment such as sucker rods and tubing , causing wax deposition, resulting in oil well pump jamming during the production process, increased pumping unit load, difficulty in starting, or even failure to start pumping, increased back pressure, or blockage of gathering and transportation pipelines, which in turn increases the workload of wellbore and pipeline heat cleaning, etc. Mor...

AI Technical Summary

Problems solved by technology

Adding liquid anti-wax agent to the oil sleeve ring by air will cause a large loss of dosing, and the medicine will gather above the moving liquid surface, which has the disadvantage of not being able to reach the oil-water interface. At the same time, there will be large fluctuations in the concentration of the intermittent dosing and it is difficult to reach the oil pipe only by molecular diffusion. shortcoming

Installing a process string containing solid anti-wax agents downhole can release effective anti-wax components to oil layers and screens, but there are disadvantages such as fast release speed, need to cooperate with workover measures, and large fluctuations in release concentration. Anti-wax adverse effects

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