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Temperature response type amphoteric polymer retarder and preparation method thereof

An amphoteric polymer, temperature-responsive technology, used in the field of oil and gas exploration and development chemicals, can solve the problems of adding amount and temperature sensitivity, unstable cement slurry, low cement stone strength, etc. Low volume sensitivity and good adjustability

Inactive Publication Date: 2016-01-27
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the retarders used in cementing construction mainly include inorganic retarders and organic retarders. However, currently commercially available retarders generally have poor temperature resistance and need to be used in combination. Disadvantages such as sensitivity, ultra-retarded setting, unstable cement paste and low cement strength in the later stage

Method used

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  • Temperature response type amphoteric polymer retarder and preparation method thereof
  • Temperature response type amphoteric polymer retarder and preparation method thereof
  • Temperature response type amphoteric polymer retarder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] (1) Weigh the corresponding monomer according to the mass percentage and dissolve it in deionized water, put the maleic anhydride solution in the reaction flask, stir and heat, and reflux the condenser tube, 2-acrylamide-2-methylpropanesulfonic acid, The mixed solution of dimethyl diallyl ammonium chloride and acrylamide is placed in the constant pressure dropping funnel;

[0021] (2), take by weighing the initiator ammonium persulfate accounting for 8% of the monomer mass and be dissolved in deionized water, and placed in the constant pressure dropping funnel;

[0022] (3) When the system temperature rises to a preset temperature of 90°C, start adding the initiator solution dropwise, as well as 2-acrylamide-2-methylpropanesulfonic acid, dimethyl diallyl ammonium chloride and acrylamide three or the mixed solution and timing;

[0023] (4) Add dropwise for 1 hour, then react at constant temperature for 4 hours, cool, purify, dry and grind the obtained solution to obtain...

example 2

[0026] The temperature-responsive amphoteric polymer retarder prepared in Example 1 was used to prepare well cement slurry, and the cement slurry consisted of the following components in parts by weight.

[0027]

[0028] When the temperature-responsive amphoteric polymer retarder of the present invention is added in an amount of 3%, the thickening time at 135°C, 140°C and 145°C is shown in Table 1, wherein the thickening curve at 140°C and 70MPa is as follows figure 2 Shown:

[0029] Table 1 Temperature Sensitivity Experiment

[0030]

[0031] When the temperature-responsive amphoteric polymer retarder of the present invention is added in an amount of 3%, the change rate of the thickening time is within 20% for every 5°C increase in temperature, and the temperature sensitivity of the amphoteric polymer retarder is low. In addition, the related Experiments also prove that the amphoteric polymer retarder is less sensitive to dosage, and the dosage sensitivity coefficien...

example 3

[0033] The temperature-responsive amphoteric polymer retarder prepared in Example 1 was used to prepare well cement slurry, and the cement slurry consisted of the following components in parts by weight.

[0034]

[0035] When the temperature-responsive amphoteric polymer retarder of the present invention is added in an amount of 0.2% and 0.5%, respectively at 70°C and 90°C, the compressive strength tests of cement stones maintained for 24h and 48h under normal pressure conditions are shown in Table 1. Among them, when the addition amount is 1%, the thickening curve at 70°C and 35MPa is as follows image 3 Shown:

[0036] Table 1 Cement stone compressive strength

[0037]

[0038] The temperature-responsive amphoteric polymer retarder prepared by the present invention can be used under high temperature conditions, and its strength develops well under low temperature conditions, which is far greater than SY / T5504.1-2005 "Evaluation Method for Oil Well Cement Admixture Pa...

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Abstract

The invention relates to an oil well cement retarder in the field of oil gas well exploration and development and a preparation method of the oil well cement retarder. The amphoteric polymer retarder is prepared from, by mass, 10-20% of dimethyldiallylammonium chloride (DMDAAC), 20-30% of 2-acrylamide-2-methyl propane sulfonic acid (AMPS), 30-50% maleic anhydride (MA) and 10-30% of acrylic amide (AM). Due to lateral groups in an amphoteric polymer structure, a self-response type response can be made for the temperature of surroundings, and the temperature adaptability is high. The delayed coagulation of cement paste within the whole temperature region with 70 DEG C and 140 DEG C as the upper and lower end temperatures of a cementing well section is achieved, the thickening time of the cement paste and the retarder added amount are in the good linear relation, the right-angled thickening effect is obvious, the temperature and the added amount sensitivity are low, and the cement paste comprehensive performance can meet the requirement for well cementation construction; in addition, the retarder is simple in synthesis technology, low in cost, high in operability and capable of achieving large-scale production and application.

Description

technical field [0001] The invention relates to a temperature-responsive amphoteric polymer retarder and a preparation method thereof, belonging to the field of chemicals for oil and gas field exploration and development. Background technique [0002] With the continuous development of oil extraction technology and the exhaustion of shallow oil and gas fields, deep wells and ultra-deep wells have become the focus of research. In deep wells and ultra-deep wells, early cementing operations have a great impact on subsequent construction. As the well depth increases, the temperature difference and pressure difference between the upper and lower layers of the cementing well section become larger and larger, and the physical and chemical properties of the cementing slurry change significantly with the increase of the well depth. higher requirements. [0003] At present, the retarders used in cementing construction mainly include inorganic retarders and organic retarders. However,...

Claims

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Application Information

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IPC IPC(8): C08F222/06C08F220/58C08F226/02C08F220/56C09K8/467
Inventor 张瑞霍锦华王吉星赵子静孙立君毛旭许夏斌陈大钧
Owner SOUTHWEST PETROLEUM UNIV
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