Oilwell cement retarder and preparation method thereof

A technology of oil well cement and retarder, which is applied in the field of well completion or cementing, and oil drilling, which can solve the problems of unstable cement slurry, not being used alone, and difficult adjustment of cement slurry thickening time, so as to achieve a good thickening curve shape , the effect of short transition time

Active Publication Date: 2012-10-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many limitations in the application of these retarders. For example, lignin sulfonates, due to different sources of lignin, have great differences in composition and structure, and the retarding effect is not easy to control; and the applicable temperature is below 90°C; sugars The compound is extremely sensitive to the addition amount, and it is difficult to adjust the thickening time of the cement slurry; the hydroxycarboxylates are only suitable for the temperature range above 120°C, and their effect on the dilution of the cement slurry is obvious, causing the instability of the cement slurry, the settlement of the slurry and the free liquid The amount is large, and it will destroy the fluid loss effect of some fluid loss reducers
Boric acid and its salts are generally not used alone, they need to be used in combination with other retarders, and are only suitable for fresh water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: each component is by weight.

[0024] Add 100 parts of soft water, 30 parts of triethylenetetramine, and 10 parts of phosphorus trichloride into a 1000 ml reaction bottle, start the stirring device, and heat the reaction system to 60°C for 1.5 hours to activate, and dropwise add 25 parts of concentration It is a 35% formaldehyde aqueous solution. After the dropwise addition is completed, heat up to 110°C and continue the reaction for 3 hours; then add 20 parts of 2-aminoethanesulfonic acid to the reaction bottle, and after it is completely dissolved, add 15 parts of epichlorohydrin , maintained at 110°C for 3 hours to obtain a viscous oil well cement retarder, which is designated as sample 1.

[0025] Prepare cement slurry according to GB / T 19139-2003 standard, evaluate initial consistency, thickening time, water loss, 24-hour compressive strength, and the cement slurry formula is as follows:

[0026] The cement slurry formula at 100°C and below 100°C is:...

Embodiment 2

[0032] Embodiment 2: each component is by weight.

[0033] Add 100 parts of soft water, 40 parts of tetraethylenepentamine, and 10 parts of phosphine trichloride into a 1000 ml reaction bottle, start the stirring device, heat the reaction system to 80°C for 2 hours, and add 20 parts of concentration It is a 35% aqueous solution of formaldehyde. After the dropwise addition is completed, heat up to 110°C and continue the reaction for 2.5 hours; then add 15 parts of 2-aminoethanesulfonic acid to the reaction bottle, and after it is completely dissolved, add ethylene glycol diglycidol 15 parts of ether were reacted at 110°C for 4 hours to obtain a viscous oil well cement retarder, which was designated as sample 2.

[0034] The cement slurry performance of retarder sample 2 was evaluated according to the method of Example 1, and the performance data are shown in Table 2.

[0035] Table 2 cement slurry performance data prepared by sample 2

[0036] formula

[0037] Note:...

Embodiment 3

[0038] Embodiment 3: each component is by weight.

[0039] Add 100 parts of soft water, 20 parts of tetraethylenepentamine, 15 parts of ethylenediamine, and 10 parts of phosphorus trichloride into a 1000 ml reaction bottle, start the stirring device, and heat the reaction system to 80 ° C for 2 hours to activate the reaction system. Add 20 parts of formaldehyde solution with a concentration of 35% to the reaction bottle dropwise. After the dropwise addition is completed, heat up to 110°C and continue the reaction for 2 hours; 10 parts of diglycidyl ether were maintained at 110°C for 3.5 hours to obtain a viscous oil well cement retarder, which was recorded as sample 3.

[0040] The cement slurry performance of retarder sample 3 was evaluated according to the method of Example 1, and the performance data are shown in Table 3.

[0041] Table 3 The performance data of cement slurry prepared by sample 3

[0042] formula

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Abstract

The invention discloses an oilwell cement retarder, which is applied to the technical field of oil drilling, well completion or well cementation. A preparation method for the oilwell cement retarder comprises the following steps of: adding 20 to 50 parts of polyamine compound, 10 to 30 parts of phosphorus trichloride or phosphorous acid and soft water into a reaction vessel, heating to a temperature of between 50 and 90 DEG C, activating for 1 to 3 hours, dripping 10 to 30 parts of aqueous solution of formaldehyde into the vessel, after finishing the dripping of the aqueous solution of formaldehyde, raising the temperature to between 100 and 120 DEG C, and reacting for 1 to 4 hours; and adding 10 to 40 parts of aminosulfonic acid compound into the vessel, after complete dissolution, adding 10 to 30 parts of epoxy compound, and keeping the temperature to continue the reaction for 2 to 4 hours so as to prepare the oilwell cement retarder. The retarder can adjust the cement paste thickening time in a temperature range of between 50 and 180 DEG C, is suitable for low, medium and high density cement paste systems, has good salt tolerance, is suitable for fresh water, seawater, saline and the like, and can be widely applied to complicated well conditions of shallow shafts, deep wells, ultra deep wells, horizontal wells, extended-reach wells and the like.

Description

technical field [0001] The invention relates to the technical field of oil drilling, well completion or well cementing, in particular to a cement retarder for well cementing and a preparation method thereof. Background technique [0002] In the cementing operation of oil and gas wells, the cement slurry is injected into the well by pumping, and the cement slurry is displaced into the annular space between the casing and the well wall through the slurry replacement, and the oil, gas and water layers are isolated after the cement slurry solidifies etc., to achieve the purpose of protecting the production layer and supporting the protective casing. The grout must remain pumpable until it reaches the desired location for the seal. Cement is a hydraulic cementitious material. With the continuous hydration of the active components in the cement slurry, the fluidity of the cement slurry will become poor. When the consistency of the cement slurry reaches a certain value, the cement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467
Inventor 赵宝辉邹建龙刘爱萍谭文礼孙富全马学勤侯薇
Owner BC P INC CHINA NAT PETROLEUM CORP
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