Highly dispersed zwitterionic dispersant for cementing pad fluid, and preparation method thereof

A cementing prefluid and amphoteric ion technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of incomplete replacement of drilling fluid in narrow annulus, reduced sealing capacity of cement sheath, and interface cementation quality Bad question

Inactive Publication Date: 2017-05-10
中石化石油工程技术服务有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these cases, when the casing centering degree is poor, the drilling fluid displacement in the narrow annulus is very likely to be incompletely replaced, resulting in a decrease in the sealing capacity of the cement sheath. This often shows that the interface cementation quality is relatively poor in the electrical measurement results, directly Affect the acceptance evaluation of cementing construction and subsequent oil and gas well production operations

Method used

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  • Highly dispersed zwitterionic dispersant for cementing pad fluid, and preparation method thereof
  • Highly dispersed zwitterionic dispersant for cementing pad fluid, and preparation method thereof
  • Highly dispersed zwitterionic dispersant for cementing pad fluid, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] It is determined that the mass ratio of the reaction monomer is AS:MA:DMDAAC=2.2:1.5:0.2, the amount of ammonium persulfate (APS) in the initiator is 1.3% of the monomer mass ratio, and the amount of reducing agent sodium bisulfite 2.0% of the monomer mass ratio, the reaction temperature was 85 °C, and the reaction time was 3 h. Add isopropanol accounting for 3% of the total amount of monomers, take it out after constant temperature for 0.5 h, and adjust its pH value to 5~6 with a pH regulator to obtain 1# zwitterionic dispersant.

[0022] Put 100 parts of clear water into the slurry cup, add 0.4 parts of viscosifier, stir and dissolve for 4 hours, then add 0.3 parts of defoamer and 5 parts of 1# amphoteric ionic dispersant in order to reach the required density of pre-liquid 45 parts of solid phase material, and 1.0 part of composite surfactant, formulated to a density of 1.2 g / cm 3 preflux. Refer to API Specification 10 B to measure the oil-based drilling fluid (den...

Embodiment 2

[0024] Determined that the mass ratio of the reaction monomer is AS:MA:DMDAAC=4.0:1.2:0.3, the amount of potassium persulfate in the initiator is 2.5% of the monomer mass ratio, and the amount of the reducing agent sodium bisulfite is 2.5% of the monomer mass ratio. 1.3% by weight, the reaction temperature was 55 °C, and the reaction time was 5 h. Add isopropanol accounting for 5% of the total amount of monomers, take it out after constant temperature for 0.5 h, adjust its pH value to 5~6 with a pH regulator, and obtain 2# zwitterionic dispersant.

[0025] Put 100 parts of clear water in the slurry cup, add 0.4 parts of viscosifier, stir and dissolve for 4 hours, then add 0.3 parts of defoamer and 5 parts of 2# zwitterionic dispersant in order to reach the required density of the front liquid 45 parts of solid phase material, and 1.0 part of composite surfactant, formulated to a density of 1.2 g / cm 3 preflux. Refer to API Specification 10 B to measure the oil-based drilling ...

Embodiment 3

[0027] The zwitterionic dispersant, SXY, and SMP synthesized in Example 1 and Example 2 were respectively added to the cement slurry, and the formed cement stone was cured at 90°C for 24 h and 72 h to test its compressive strength. Test The results are shown in Table 5. It can be seen from Table 5 that the compressive strength of cement stone added with zwitterionic dispersant is higher than that of cement stone containing SXY or SMP.

[0028] From Table 1 to Table 4, it can be seen that the pad fluid containing zwitterionic dispersant has good compatibility and dispersibility to drilling fluid and cement slurry, and the mixed slurry has no thickening and flocculation. Has good rheology.

[0029] It can be seen from Table 5 that zwitterionic dispersants with different component contents can improve the compressive strength of cement stone to varying degrees, and the 1# product has a strong ability to improve the compressive strength value of cement stone.

[0030] Table 1 Ef...

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Abstract

The present invention relates to a highly dispersed zwitterionic dispersant for a cementing pad fluid, and a preparation method thereof, wherein the highly dispersed zwitterionic dispersant comprises a monomer, an initiator accounting for 1.3-2.5% of the mass of the monomer, a reducing agent accounting for 0.8-2.0% of the mass of the monomer, and isopropyl alcohol accounting for 3-5% of the mass of the monomer. The preparation method comprises: adding a monomer to water, heating and stirring, heating to a temperature of 50-85 DEG C after the solid is completely dissolved, stirring for 10-20 min, respectively adding an initiator and a reducing agent, carrying out a constant temperature reaction for 3-6 h, adding isopropyl alcohol, carrying out constant temperature treatment for 0.3-0.6 h, taking out, and adjusting the pH value to 5-6 with a 45% sodium hydroxide solution so as to obtain the product. According to the present invention, after the highly dispersed zwitterionic dispersant is added to a cementing pad fluid, the good dispersing and compatibility effects are provided for the drilling fluid and the cement slurry, the mixed fluid has the good rheological property, and the cement slurry annulus replacement efficiency and the cementing interface cementation quality can be effectively improved; and the preparation method is simple and feasible, is conveniently used on site, and has strong operability.

Description

technical field [0001] The invention relates to a zwitterionic dispersant used in cementing prefluid, and a synthesis and application method of the dispersant, belonging to the field of geological exploration and oil and gas field exploration and development chemicals. Background technique [0002] During the cementing operation of oil and gas wells, when the cement slurry replaces the drilling fluid, when the cement slurry and the drilling fluid are in contact, there will be different degrees of mutual pollution between the two, so that the mixed slurry is prone to thickening and viscosity increase. , or even flocculation and agglomeration, which will seriously increase the pump pressure and pressure the formation, which greatly affects the normal cementing operation and increases the risk in the operation process. [0003] At present, the commonly used method in field construction is to use some existing dispersants or viscosity reducers for drilling fluid or cement slurry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/40C09K8/52
CPCC09K8/40C09K8/52
Inventor 彭志刚王毅陈大钧路志平饶鸿飞齐志刚曹成章曹会莲魏绪伟高辉马丁马德材
Owner 中石化石油工程技术服务有限公司
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