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Antiscalant agent for water-in-oil system in high-temperature oilfield environment, its preparation method and application

A technology of high temperature environment, anti-scaling agent, applied in water pollutants, mining wastewater treatment, descaling and water softening, etc., can solve the problem of anti-scaling of steam heaters in few oil fields, achieve good biodegradation performance, unique inhibition effect, effect of good thermal stability

Active Publication Date: 2016-01-20
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The anti-scaling agent described in the above patent has good anti-scaling effect under the condition of ≤100°C, but its performance is no longer ideal when the temperature is higher, and it is rarely used in the ultra-high temperature and high mineralization of oilfield steam heaters. Scale prevention for water-in-oil fluids

Method used

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  • Antiscalant agent for water-in-oil system in high-temperature oilfield environment, its preparation method and application
  • Antiscalant agent for water-in-oil system in high-temperature oilfield environment, its preparation method and application
  • Antiscalant agent for water-in-oil system in high-temperature oilfield environment, its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of antiscalant agent: prepare an antiscalant agent suitable for water-in-oil system in oil field ultra-high temperature environment according to the weight ratio of the components described in Table 1, and add the commercially available liquid single agent bis-1,6-bis-hexamethylene triamine penta Methylidene phosphoric acid, phosphinoacrylic acid multi-polymer, polyepoxysulfonic acid, 2-phospho-1,2,4-tricarboxylic butane, stir evenly, adjust the pH value to 7 with 40% sodium hydroxide, Stir for 20 minutes, cool to room temperature, add emulsifier alkylphenol polyoxyethylene ether, calculate the water consumption, add a certain amount of water to make the active ingredient of the agent 40%, stir for 15 minutes, and obtain the finished oilfield antiscaling agent.

[0021] Table 1 prepares each single agent pure product weight percent example of antiscaling agent

[0022]

[0023]

[0024] The obtained antiscalant drug names are HTS-01, HTS-02, HTS-03, HT...

Embodiment 2

[0026] Add 100mg / L of HTS-01, HTS-02, HTS-03, HTS-04, HTS-05 to the oil-water mixture with water content of 10% and 20% respectively, after fully shearing and emulsifying, separate and measure water The effective concentration of antiscalant and dispersant in the phase.

[0027] Table 2 Dispersibility of antiscalant and dispersant in oil-water phase

[0028]

Embodiment 3

[0030] During the experiment, the oil-water mixture samples in the oilfield were prepared or the oil-water mixture was collected on the oilfield site, and the high-temperature and high-pressure reactor was used to simulate the temperature of the heat exchange interface of the on-site steam heater device and the pressure of the oil-water mixture, and the water-phase scaling of the oil-water mixture in the oilfield was investigated. For the experiment, the experimental process is shown in the attached figure figure 1 .

[0031] Table 3 The quality of oilfield produced water with calcium sulfate scaling tendency in laboratory configuration

[0032]

[0033] Put the prepared aqueous solution in the high temperature and high pressure simulated steam heater device in the laboratory, heat it at a constant temperature of 180°C for 2 hours, take out the solution after cooling, detect the remaining calcium ion concentration at this time, calculate the scale inhibition rate of the ant...

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Abstract

The invention provides an anti-scale agent for a water-in-oil system in an oilfield high-temperature environment as well as a preparation method and a use of the anti-scale agent. The anti-scale agent is characterized by being prepared from bis(1,6-hexamethylene triamine penta(methylene phosphonic acid)), a phosphinoacrylic acid multipolymer, poly(epoxy sulfocarboxylic acid), 2-phosphonobutane-1,2,4-tricarboxylic acid and alkylphenol polyoxyethylene ether, wherein the total content of the active constituents of the anti-scale agent is not lower than 40%. The preparation method comprises the following steps: orderly adding the raw materials, mixing evenly, adjusting the pH value to 7, stirring for 20 minutes, cooling until the temperature reaches a room temperature, next, adding water, and finally, adding the emulsifier alkylphenol polyoxyethylene ether and stirring for 15 minutes to obtain the anti-scale agent. The anti-scale agent is applied to the scale prevention use of the water-in-oil system in the high-temperature environment of 200 DEG C and below, and in terms of the water quantity in the oil-water mixture, the use amount of the anti-scale agent is 60-100mg / L.

Description

technical field [0001] The invention belongs to the technical field of oilfield production fluid treatment, and in particular relates to an antiscaling agent for a water-in-oil system in an oilfield high-temperature environment, its preparation method and application. Background technique [0002] Scaling is a common problem in oilfield production. It mostly occurs on the inner and outer walls of downhole tubing, screen pipes, tailpipes, oil well pumps, casing inner walls, oilfield manifolds, heat exchangers, steam heaters, etc. The main types of scaling are There are calcium carbonate scale, calcium sulfate scale, barium sulfate scale and strontium sulfate scale, etc. Among them, the sulfate scale has a dense structure and is insoluble in acid, so it cannot be removed by pickling. Once scaled, it will be more harmful. [0003] Generally, after the oil-gas-water three-phase separation of oil-gas-water production fluid is carried out by the production separator, the water con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/10
CPCC02F5/14C02F2101/32C02F2103/10C02F2303/22C02F2305/04
Inventor 王会靳晓霞孙继滕厚开
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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