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High temperature resistant toughening retarder

A technology of high temperature resistance and retarder, used in drilling compositions, chemical instruments and methods, etc., can solve the problems of lack of toughening effect, high dosage sensitivity, loss of retardation effect, etc., and achieve thickening time Adjustable, good settlement stability, good fluidity

Active Publication Date: 2013-11-20
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no relevant reports on improving the mechanical properties of cement stone while improving the high-temperature thickening time of cement slurry and adjusting the sensitivity of retarder addition.
[0004] Boric acid and borax are common retarders for oil well cement, which have a good retarding effect on oil well cement, but the addition of boric acid has a linear or exponential relationship with the thickening time, and the sensitivity of the addition is very high; when borax is used in high temperature environments It loses its retarding effect and has no toughening effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The relevant parameters in the preparation process of high temperature resistant toughening retarder are as follows:

[0024] Sepiolite mesh number (mesh): 300

[0025] Nitric acid concentration (mol / L): 0.4

[0026] Sepiolite acid activation stirring speed (r / min): 120

[0027] Sepiolite acid activation time (h): 3

[0028] Sepiolite roasting temperature (°C): 110

[0029] Seafoolite roasting time (h): 2

[0030] Borax mass (g): 12

[0031] Mass of boric acid (g): 88

[0032] Mass of sepiolite for adsorption (g): 25

[0033] Volume of boric acid-borax solution for adsorption (mL): 450

[0034] Adsorption time (h): 2

[0035] Spray drying temperature (°C): 150

[0036] Preparation of cement slurry for well cementing: Weigh 100 parts by weight of oil well cement, 40 parts by weight of quartz sand, 3 parts by weight of hydroxyethyl cellulose dry mix into dry powder, measure 61 parts of water, 0.4 to 2 parts by weight of high temperature resistant toughening retar...

Embodiment 2

[0040] The relevant parameters in the preparation process of high temperature resistant toughening retarder are as follows:

[0041] Sepiolite mesh number (mesh): 500

[0042] Nitric acid concentration (mol / L): 1.5

[0043] Sepiolite acid activation stirring speed (r / min): 120

[0044] Sepiolite acid activation time (h): 3.5

[0045] Sepiolite roasting temperature (°C): 115

[0046] Seafoolite roasting time (h): 2

[0047] Borax mass (g): 30

[0048] Mass of boric acid (g): 70

[0049] Mass of sepiolite for adsorption (g): 26

[0050] Volume of boric acid-borax solution for adsorption (mL): 500

[0051] Adsorption time (h): 2

[0052] Spray drying temperature (°C): 180

[0053] Preparation of cement slurry for well cementing: Weigh 100 parts by weight of oil well cement, 40 parts by weight of slag, 2.5 parts by weight of hydroxyethyl cellulose and dry mix it into a dry powder, measure 60 parts of water, and 0.4 to 2.5 parts by weight of high temperature resistant toug...

Embodiment 3

[0057] The relevant parameters in the preparation process of high temperature resistant toughening retarder are as follows:

[0058] Sepiolite mesh number (mesh): 800

[0059] Nitric acid concentration (mol / L): 0.6

[0060] Sepiolite acid activation stirring speed (r / min): 130

[0061] Sepiolite acid activation time (h): 5

[0062] Sepiolite roasting temperature (°C): 140

[0063]Seafoolite roasting time (h): 2.5

[0064] Borax mass (g): 36

[0065] Mass of boric acid (g): 64

[0066] Mass of sepiolite for adsorption (g): 28

[0067] Volume of boric acid-borax solution for adsorption (mL): 550

[0068] Adsorption time (h): 2.5

[0069] Spray drying temperature (°C): 200

[0070] Preparation of cement slurry for well cementing: Weigh 100 parts by weight of oil well cement, 30 parts by weight of fly ash, 1.5 parts by weight of hydroxyethyl cellulose dry mix into dry powder, measure 60 parts of water, 0.4 to 2.5 parts by weight of high temperature resistant toughening sl...

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Abstract

The invention discloses a high temperature resistant toughening retarder. A preparation method of the high temperature resistant toughening retarder comprises the following steps of: (1) smashing sepiolite, soaking by water, stirring and clarifying, then filtering, washing, drying, smashing, levigating and screening; adding the sepiolite powder into a nitric acid, sulfuric acid or hydrochloric acid solution, stirring for 3-8 hours, then washing with deionized water to be neutral, and filtering; roasting for 2-4 hours at 100-200 DEG C, and then calcining for 2-3 hours at 600 DEG C; (2) uniformly mixing borax and boric acid at a mass ratio of 1.2-4:6-8.8, slowly pouring into water, and stirring for 5-15 minutes; (3) adding the processed sepiolite into the mixed solution of borax and boric acid, stirring for 2-4 hours so as to prepare the mixed liquor of sepiolite, boric acid and borax; (4) spray-drying. According to the high temperature resistant toughening retarder, components with delayed coagulation effect are released slowly, and the sensitive degree of cement to the retarder is lowered, so that set cement has good mechanical property at low temperature, and also can play a delayed coagulation role at high temperature without affecting the mechanical property.

Description

technical field [0001] The invention relates to a toughening retarder used in the cementing of oil and gas wells in oil and gas exploration and development. The retarder can improve the mechanical properties of cement while adjusting the thickening time of cement. Background technique [0002] With the continuous development of oil exploration and development towards high-temperature wells, deep wells and ultra-deep wells, the cement slurry in the cementing process is required to have good temperature resistance and pumpability. Only by changing the chemical composition and mineral composition of cement clinker The basic method is difficult to deal with and adapt to. Therefore, in order to prevent the pumped cement slurry from rapidly thickening and coagulating during the entire pumping process in the cementing operation of high-temperature wells, deep wells and ultra-deep wells, an appropriate retarder must be added to make the cementing The operation was carried out safely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
Inventor 程小伟王岩李早元李明郭小阳伍鹏童杰龙丹
Owner SOUTHWEST PETROLEUM UNIV
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