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Preparation method of cement retarder

A cement retarder and a technology for preparation steps, which are applied in the field of oil well cement admixture preparation, can solve the problems of poor degradation performance, poor retardation effect and the like, and achieve the effect of enhancing retardation effect

Inactive Publication Date: 2017-08-08
常州五荣化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention: Aiming at the disadvantages of poor retarding effect and poor degradation performance of traditional cement retarders, a preparation method of cement retarders is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] First, weigh 10kg of corn stalks and add them to the pulverizer to pulverize for 25 minutes to obtain pulverized materials. The pulverized materials will be composted for 15 days. During the composting period, the compost will be turned over every 2 days. When the composting process is over, the compost product will be obtained. The product was added to a beaker containing 2L of 10% sodium hydroxide solution, stirred and mixed for 1 min, and then 15 g of sodium pyrophosphate was added to the beaker, soaked for 3 hours and filtered to obtain the filtrate, and the filtrate was spray-dried to obtain the dried product , Weigh 40g itaconic acid and add it to a beaker containing 200mL of water, move the beaker into a digital magnetic stirrer with constant temperature and speed measurement, and stir and dissolve for 10min under the conditions of a temperature of 50℃ and a rotating speed of 300r / min to obtain a garment Then add 100mL itaconic acid solution to a three-necked flask...

example 2

[0023] First, weigh 11kg of corn stalks and add them to the pulverizer to pulverize for 28 minutes to obtain the pulverized material. The pulverized material is composted for 18 days. During the composting period, the pile is turned over every 3 days. When the composting process is over, the composted product is obtained. Take 350g of compost. The product was added to a beaker containing 3L of 10% sodium hydroxide solution, stirred and mixed for 2 minutes, then 18g of sodium pyrophosphate was added to the beaker, soaked for 4 hours and filtered to obtain the filtrate, and the filtrate was spray-dried to obtain the dried product , Then weigh 45g itaconic acid and add it to a beaker containing 250mL of water, move the beaker into a digital constant-temperature speed-measuring magnetic stirrer, stir and dissolve at a temperature of 55°C and a rotational speed of 330r / min for 13 minutes to obtain a garment Then add 130mL itaconic acid solution to a three-necked flask with a thermome...

example 3

[0026] First, weigh 12kg of corn stalks and add them to the pulverizer to pulverize for 30 minutes to obtain the pulverized material. The pulverized material is composted for 20 days. During the composting period, the pile is turned over every 3 days. When the composting process is over, the compost product is obtained. Take 400g of compost The product was added to a beaker containing 3L of 10% sodium hydroxide solution, stirred and mixed for 3min, and then 20g of sodium pyrophosphate was added to the beaker, soaked for 4h and filtered to obtain a filtrate, and the filtrate was spray dried to obtain a dried product , Then weigh 50g of itaconic acid and add it to a beaker containing 300mL of water, move the beaker into a digital constant temperature and speed measuring magnetic stirrer, stir and dissolve at a temperature of 60°C and a speed of 350r / min for 15 minutes to obtain a garment Then measure 150mL of itaconic acid solution and add it to a three-necked flask with a thermom...

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Abstract

The invention discloses a preparation method of a cement retarder, and belongs to the technical field of preparation of oil well cement admixtures. The preparation method comprises the following steps of firstly, composting stalk to produce humus; using a sodium pyrophosphate alkaline solution to extract the humus, so as to obtain water-soluble humic acid; quickly degrading the humic acid under the visible light, and enabling the humic acid to complex with calcium ions to form insoluble precipitate to adsorb onto the surface of hydrate, thereby blocking contact with water; using aspartic acid as a raw material, performing amidation, and introducing itaconic acid into the aspartic acid; using the itaconic acid-modified aspartic acid and vinyl phosphonic acid as monomers to polymerize, so as to obtain the polymer, wherein the polymer contains hydroxy and phosphonic acid groups, the hydroxy and phosphonic acid groups has stronger activating effect on the surfaces of cement particles and hydrolyzed products, and can adsorb onto the surface of the solid particle, and the formation of cement and slurry structure is delayed. The prepared cement retarder has the advantages that the good retarding effect and degrading property are realized, and the mixing amount is small in use.

Description

Technical field [0001] The invention relates to a method for preparing a cement retarder, and belongs to the technical field of oil well cement admixture preparation. Background technique [0002] With the improvement of drilling technology and the increasing difficulty of oilfield exploitation, drilling has developed into deep wells, ultra-deep wells, and complex wells. The bottom hole temperature and pressure have increased significantly. However, the oil well cement slurry rapidly thickens during the process of cementing under high temperature and high pressure, which cannot meet the requirements of solidification. Requirements for well construction. In order to ensure the safety of construction, a suitable retarder must be added to the cement slurry to make the cementing operation safe and smooth. The retarder is the most important kind of cement admixtures for oil wells. In deep wells and ultra-deep wells, it is usually necessary to add a retarder to the cement slurry to ad...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B103/22
CPCC04B40/0046C04B2103/22C04B24/24C04B24/243
Inventor 林正脉盛开洋王维
Owner 常州五荣化工有限公司
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