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Oil field scale inhibitor as well as preparation method and application thereof

A scale inhibitor and oilfield technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problems of loss of scale inhibitor effect, easy to be decomposed, low thermal stability of scale inhibitor, etc. Achieve good thermal stability and high calcium tolerance

Active Publication Date: 2015-04-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason for the poor scale inhibition effect of scale inhibitors at high temperatures is that general scale inhibitors have low thermal stability and are easily decomposed at high temperatures and lose their scale inhibition effect.

Method used

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  • Oil field scale inhibitor as well as preparation method and application thereof
  • Oil field scale inhibitor as well as preparation method and application thereof
  • Oil field scale inhibitor as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] This example provides three different scale inhibitors, the composition of which is shown in Table 1.

[0017] These three antiscalants were prepared according to the following steps:

[0018] Heat water to 60°C, then add 2-phosphonic acid-1,2,4-tricarboxylic acid butane, sulfonated styrene and emulsifier OP-10 in sequence, and stir evenly to obtain scale inhibitor.

[0019] The composition of table 1 antiscalant composition (in terms of the gross weight of this antiscalant, unit is %)

[0020]

[0021] Embodiment 2 scale inhibitor performance test experiment

[0022] In this example, the heat stability and calcium tolerance of the scale inhibitor are tested.

[0023] The thermal stability test method is: heat the scale inhibitor at 150°C for 72 hours, and measure the change of scale inhibition rate before and after heat treatment. -1993): In the water sample with a scale inhibitor concentration of 80mg / L, keep the temperature at 95°C for 25 hours, take it out, co...

Embodiment 3

[0032] Example 3 Scale inhibition performance evaluation experiment

[0033] In this example, the scale inhibition performance of the scale inhibitor was evaluated. The experimental water used in the scale inhibitor performance evaluation experiment was prepared with reference to the oilfield water quality characteristics to simulate oilfield water (see Table 3 for the specific composition), and the water used for the preparation was tap water.

[0034] Get 3 kinds of antiscalant GY-01, GY-02, GY-03 that embodiment 1 provides, evaluate antiscalant according to China petroleum and natural gas industry standard " performance evaluation method of antiscalant agent for oil field " (SY / T5673-1993) Scale inhibition performance (expressed as scale inhibition rate), according to "Evaluation Method of Corrosion Inhibitor Performance for Oilfield Produced Water" (SY / T5273-2000) to evaluate the corrosion inhibition performance of scale inhibitor (expressed as corrosion inhibition rate). ...

Embodiment 4

[0041] In this example, the performance of scale inhibitors in practical applications is tested: take the three scale inhibitors GY-01, GY-02, and GY-03 provided in Example 1, and mix them with hot water pipe network in an oil production plant in Liaohe Oilfield On-site evaluation of antiscalant performance, the specific operation is to mix the antiscalant into the hot water pipe network, and mix it with high-temperature oilfield water for transportation. The on-site working conditions are: water temperature 90°C, water pressure 1.1-1.8MPa, flow rate 150-210m 3 / d, the indicators of water quality analysis are shown in Table 5, the dosage of scale inhibitor is 80mg / L, and the test time is 2 months.

[0042] Table 5 Water quality analysis indicators of on-site water quality

[0043] indicators

Contentmg / L

total residue

2065.96

TDS

1892.23

Petro

31.01

Cl -

361.54

SO 4 2-

30.58

Ca 2+ Har...

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Abstract

The invention relates to an oilfield scale inhibitor, as well as preparation method and application thereof. The the oilfield scale inhibitor comprises the following components in weight percent: 5%-30% of 2-phosphonic acid-1, 2, 4- tricarboxylic acid, 2%-4% of emulsifying agent OP-10, 20%-40% of sulfonated styrene and the balance of water. The preparation method for the oilfield scale inhibitor comprises the following steps: heating water to 60 degree C, sequentially adding 2-phosphonic acid-1, 2, 4- tricarboxylic acid, the emulsifying agent OP-10 and sulfonated styrene, stirring until the mixture is uniform, and finally obtaining the oilfield scale inhibitor. The invention further provides application of the oilfield scale inhibitor for high-temperature water scaling prevention in the oilfield. The oilfield scale inhibitor provided by the invention has excellent thermal stability, high calcium tolerance and compatibility with oilfield water, has the functions of scale inhibition, corrosion inhibition and dispersion under high temperature, and can satisfactorily control the scaling problem of high temperature oilfield water.

Description

technical field [0001] The invention relates to an oilfield scale inhibitor, a preparation method and application thereof, and belongs to the technical field of petrochemical industry. Background technique [0002] In the oilfield production process, the mining and transportation process mainly uses treated oilfield sewage as water injection and water mixing water source. Since oilfield sewage contains a large amount of calcium, magnesium and other ions that are easy to scale and SO 4 2- , C1 - Corrosion-prone ions, such as temperature and pressure, are prone to scaling of equipment and pipe networks. Especially in oil field thermal recovery and high-temperature water mixing processes, the solubility of calcium carbonate decreases due to the increase in water temperature, and the resistance The decomposition rate of the scale agent is accelerated, which makes the scale problem more serious. [0003] Ordinary antiscalants often fail to achieve ideal antiscaling effects in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/528C09K8/54
Inventor 岳大伟王立军刘喜林阚艳红陈定杰郑秀海
Owner PETROCHINA CO LTD
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