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Oil well cement high-temperature retarder microcapsule and preparation method thereof

An oil well cement and retarder technology, which is applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of ultra-retardation of cement slurry, single performance of cement retarder, and insufficient cross-temperature zone width, etc. The effect of small diameter, wide application range and short curing time

Active Publication Date: 2018-09-25
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] An object of the present invention is to provide a high-temperature retarder for oil well cement to solve the problem that the existing cement retarder has a single performance and does not have a wide enough temperature range, which leads to the problem of super-retarding cement slurry at the top of the cementing well section during large temperature difference cementing construction. coagulant microcapsules

Method used

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  • Oil well cement high-temperature retarder microcapsule and preparation method thereof
  • Oil well cement high-temperature retarder microcapsule and preparation method thereof
  • Oil well cement high-temperature retarder microcapsule and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The preparation method of oil well cement high temperature retarder microcapsules is as follows:

[0035] Step S1, weigh 60 parts of high-temperature retarder SN-3 and dissolve in 50 parts of deionized water to dissolve completely, then add 0.5 parts of Span 80, add the mixed solution into the container, adopt mechanical emulsification method, control the speed of 10000r / min Stir and pre-emulsify at room temperature for 10 minutes;

[0036] Step S2, take by weighing 10 parts of reactive diluent (5 parts of tripropylene glycol diacrylate TPGDA and ditrimethylolpropane tetraacrylate DTMPTA each), 20 parts of polyurethane acrylate CN972, 2 parts of photoinitiator (photoinitiated Each 1 part of photoinitiator 1173 and photoinitiator 184), add in the reaction container; Wherein, photoinitiator 1173 refers to α-hydroxyisobutyrophenone, and photoinitiator 184 refers to 1-hydroxycyclohexyl phenyl ketone;

[0037] Step S3, taking 100 parts of deionized water and 1 part of Tween...

Embodiment 2

[0040] The preparation method of oil well cement high temperature retarder microcapsules is as follows:

[0041] Step S1, weigh 50 parts of lignosulfonate and dissolve in 50 parts of deionized water to dissolve completely, then add 1 part of Span 80, add the mixed solution into the container, adopt mechanical emulsification method, control the rotation speed of 10000r / min to stir, Pre-emulsify at room temperature for 10 minutes;

[0042] Step S2, weighing 5 parts of reactive diluent alkyl acrylate, 30 parts of polyester acrylic resin, 3 parts of photoinitiator 2959 (2-hydroxy-4'-(2-hydroxyethoxy)-2-methylbenzene acetone), add in the reaction vessel;

[0043] Step S3, taking 100 parts of deionized water and 1.5 parts of Tween 80 into the reaction vessel, stirring mechanically, controlling the rotation speed to 600r / min, stirring for 5 minutes, then adding the emulsion prepared in step S1 into the reaction vessel, and continuing to stir for 15 minutes;

[0044] Step S4, feed n...

Embodiment 3

[0046] The preparation method of oil well cement high temperature retarder microcapsules is as follows:

[0047] Step S1, take 55 parts of high-temperature retarder boric acid and dissolve in 50 parts of deionized water to dissolve completely, then add 1.5 parts of Span 80, add the mixed solution into the container, use mechanical emulsification method, control the speed of 10000r / min to stir, Pre-emulsify at room temperature for 15 minutes;

[0048] Step S2, weighing 10 parts of active diluent (3 parts of dimethyl dithiophosphate DMPTA, 3 parts of pentaerythritol triacrylate PETA, 4 parts of diphenylphosphoryl azide DPPA), 20 parts of polyurethane acrylate CN972, 2 parts Part photoinitiator 1173 (alpha-hydroxyisobutyrophenone), adds in the reaction vessel;

[0049] Step S3, take 100 parts of deionized water and 0.5 parts of Tween 80 into the reaction vessel, stir mechanically, control the rotation speed to 600r / min, stir for 10 minutes, then add the emulsion prepared in step S...

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Abstract

The invention discloses an oil well cement high-temperature retarder microcapsule. Raw materials of the microcapsule include, by weight, 50-60 parts of a high-temperature retarder, 5-10 parts of a reactive diluent, 20-30 parts of a water-insoluble oligomer wall material, 2-3 parts of a photoinitiator and 1-3 parts of an emulsifier. The water-insoluble oligomer wall material is polyurethane acrylicresin or polyester acrylic resin. The reactive diluent is at least one of alkyl acrylate, hydroxy acrylate, methacrylate, ethylene glycol diacrylate, propylene glycol diacrylate, trimethylolpropane triacrylate, dimethyl dithiophosphate, pentaerythritol triacrylate and diphenylphosphoryl azide. The microcapsule is prepared from the abovementioned raw materials through a W / O / W composite emulsion photopolymerization method. The microcapsule ensures that the cement slurry has similar thickening time and compressive strength under the condition of a large temperature difference, that the comprehensive performance of the cement slurry system satisfies the requirements of cementing construction of thermal production wells, and the process is simple and is favorable for industrialization. .

Description

technical field [0001] The invention relates to the field of cementing engineering for oil and gas exploration and development, in particular to a high-temperature retarder microcapsule for oil well cement and a preparation method thereof. Background technique [0002] Cementing engineering is an important link in the drilling and completion process of oil and gas wells. Cement slurry cementing technology refers to injecting cement into the annular space between the well wall and the casing, and achieving the sealing effect through the cement sheath. The quality of cementing determines the productivity of oil and gas layers and the life of oil and gas wells, so it is necessary to improve the quality of cementing slurry. At present, as oil and gas exploration and development gradually extend to deep formations, the corresponding formation temperature gradually increases, and the focus of oil and gas field development gradually shifts to deep wells, ultra-deep wells and other ...

Claims

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Application Information

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IPC IPC(8): C09K8/467
CPCC09K8/467
Inventor 彭志刚冯茜刘高峰郑勇张健张博建
Owner SOUTHWEST PETROLEUM UNIV
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