Medium-high-temperature oil well cement retarding agent as well as preparation method and application thereof

A technology of oil well cement and retarder, which is applied in the fields of oil well cement retarder and medium-high temperature oil well cement retarder. It can solve the problems of high initial consistency, over-retarding of cement slurry at the top, and sensitivity to dosage, etc., and reach the applicable temperature. The effects of wide range, overcoming sensitivity to dosage, and simple preparation process

Active Publication Date: 2019-03-22
CHINA PETROCHEMICAL CORP +3
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

There are many limitations in the application of these retarders. For example, the retarding effect of lignosulfonates and hydroxycarboxylates is difficult to control and unstable under the medium and high temperature conditions of 65-135°C; It is extremely sensitive to the addition amount, and it is difficult to adjust the ring condensation time of cement slurry; organic phosphonic acid and its salts are sensitive to the addition amount under medium and high temperature conditions; unsaturated carboxylic acid polymer retarders often have high initial consistency and thickening The phenomenon of "bulging" and "stepping" of the curve, long thickening transition time, prone to "gas channeling", unable to achieve the effect of sealing oil, gas and water layers and protecting the casing, and the top cement slurry is prone to occur in the environment of large temperature difference The phenomenon of over-retarding will seriously affect the cementing quality and construction safety

Method used

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  • Medium-high-temperature oil well cement retarding agent as well as preparation method and application thereof
  • Medium-high-temperature oil well cement retarding agent as well as preparation method and application thereof
  • Medium-high-temperature oil well cement retarding agent as well as preparation method and application thereof

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preparation example Construction

[0022] The invention provides a kind of preparation method of medium and high temperature oil well cement retarder, comprising the following steps:

[0023] In the presence of organic phosphonate and initiator, itaconic acid, acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid are polymerized in water to obtain a medium-high temperature oil well cement retarder.

[0024] One of the purposes of the present invention is to provide a method for preparing a medium-high temperature oil well cement retarder. The obtained retarder has a better retarding effect under medium-high temperature conditions, and is not sensitive to the dosage, and has a wide applicable temperature range during application. , High strength of cement stone top, etc.

[0025] The invention mainly adopts water-soluble monomers such as itaconic acid to carry out polymerization in an aqueous solution of organic phosphonate. The monomers described in the present invention include itaconic acid, acrylic aci...

Embodiment 1

[0039] Add 16.08g of IA and 40g of water into a 500mL four-necked flask equipped with a thermometer, condenser and stirrer, raise the temperature to 45°C and stir for 15 minutes to dissolve completely, then weigh 8.88g of AA and 17.04g of AMPS and dissolve them in 60g of water , it is transferred to the four-necked flask, then weigh 150g EDTMPS solution (commercially available product, effective concentration is 28%), stir evenly, be warming up to 60 ℃, add the aqueous solution that 8g contains 0.42g initiator ammonium persulfate In this flask, constant temperature reaction 8h, obtains 300g retarder. The molecular weight was 5000, and the molecular weight distribution was 4.99.

Embodiment 2

[0041] Add 19.26g of IA and 50g of water into a 500mL four-necked flask equipped with a thermometer, a condenser, and a stirrer, raise the temperature to 45°C and stir for 15 minutes to dissolve completely, then weigh 10.68g of AA and 20.46g of AMPS and dissolve them in 70g of water , it is transferred to the four-necked flask, then take by weighing 120g EDTMPS solution (concentration is 28%), stir evenly, be warming up to 60 ℃, 9.6g will contain the aqueous solution of 0.76g initiator potassium persulfate to add in the flask, constant temperature After reacting for 6 hours, 300g retarder was obtained. The molecular weight is 8000, and the molecular weight distribution is 3.5.

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Abstract

The invention provides a medium-high-temperature oil well cement retarding agent as well as a preparation method and application thereof. The method comprises the following steps of under the condition of existence of organo-phosphonate and an initiator, itaconic acid, acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid take polyreaction in water to obtain the medium-high-temperature oil well cement retarding agent. The obtained retarding agent product is the medium-high-temperature oil well cement retarding agent with the application temperature range being 65 to 135 DEG C; meanwhile,the addition sensitivity of small molecular compounds, high initial thickness of carboxylic acid polymers and abnormal gelling phenomenon are overcome; during application, no reversal phenomenon occurs. The raw materials used by the oil well cement retarding agent are proper; the preparation process is simple; the application temperature range of the retarding agent is wide; the influence on the cement rock intensity is small; the thickening time and the retarding agent addition are in linear relationship.

Description

technical field [0001] The invention belongs to the technical field of oil well cement additives, and relates to an oil well cement retarder, in particular to a medium-high temperature oil well cement retarder, its preparation method and application. Background technique [0002] Well cementing construction is an important preparatory work before oil and gas exploitation, and the quality of construction determines the life span and production volume of oil wells. In the cementing operation of oil and gas well cementing construction, the cement slurry is pumped down into the well along the casing by pumping, and the cement slurry is returned to the annular space between the casing and the wellbore after the slurry is replaced. To achieve the purpose of isolating fluid flow between layers, supporting protective casing and protecting production layers. Retarder is an extremely important admixture for oil well cement. It mainly prolongs the thickening time of cement slurry by i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F222/02C08F220/06C08F2/38C04B24/16C04B103/22
CPCC04B24/163C04B2103/22C08F2/38C08F220/58C08F220/585C08F222/02C08F220/06
Inventor 李晓岚郑志军马小龙李艳宋亚静谢波
Owner CHINA PETROCHEMICAL CORP
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