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A kind of acid soluble cement slurry and its preparation method and application

A cement slurry and acid-soluble technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor fluidity, unsatisfactory magnesia cement slurry, and incomplete dissolution of cement chips, so as to slow down thickening. Faster curing and hardening speed, long thickening time, and the effect of reducing water loss

Active Publication Date: 2021-03-09
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the first cement slurry provided by the prior art, only calcium carbonate can dissolve in acid, so after pickling, the cement chips remaining in the perforation holes and cracks cannot be completely dissolved
The second type of cement slurry is easy to thicken and harden when the temperature is higher than 50°C, and the fluidity becomes poor, and the temperature in the oil and gas well is 30°C to 100°C, so the magnesia cement slurry cannot meet the requirements of oil and gas well cementing operations. Require

Method used

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  • A kind of acid soluble cement slurry and its preparation method and application
  • A kind of acid soluble cement slurry and its preparation method and application
  • A kind of acid soluble cement slurry and its preparation method and application

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preparation example Construction

[0051] In a second aspect, the embodiments of the present invention also provide a method for preparing acid-soluble cement slurry, the preparation method comprising the following steps:

[0052] According to the parts by weight of each component, add water, magnesium chloride, retarder, fluid loss reducer, and optional sodium tripolyphosphate into the first batching tank, and stir to obtain a mixed solution; add Dead burnt magnesia, magnesium carbonate, calcium carbonate, and optional superfine silicon dioxide and ammonium phosphate are stirred to obtain a dry mixture; in the third liquid mixing tank, the mixed solution is stirred and reacted with the dry mixture to obtain cement pulp.

[0053] The above-mentioned preparation method is simple, and it is convenient to prepare cement slurry whose fluidity and thickening time meet the requirements of cementing construction, and can be dissolved in acid after the cement slurry is hardened, which is convenient for dredging perfora...

Embodiment 1

[0062] This embodiment provides an acid-soluble cement slurry, which is prepared by the following method: according to the parts by weight of each component, add 0.38 parts of water, 0.5 parts of magnesium chloride, and 0.01 part of organic phosphoric acid in the first batching tank / maleic anhydride copolymer, 0.03 part of acrylic acid / 2-acrylamide-2-methylpropanesulfonic acid / polyvinylpyrrolidone copolymer, 0.01 part of sodium tripolyphosphate, and stirred for 60 minutes to obtain a mixed solution. Add 1 part of dead burnt magnesia, 0.1 part of magnesium carbonate, 0.3 part of calcium carbonate, 0.006 part of ultrafine silica with a particle size of 3 μm, and 0.02 part of ammonium phosphate into the second liquid mixing tank, and stir for 50 minutes to obtain a dry mixture. Finally, in the third liquid mixing tank, the mixed solution and the dry mix are mixed and reacted to obtain the cement slurry provided in Example 1.

Embodiment 2

[0064] This embodiment provides an acid-soluble cement slurry, which is prepared by the following method: according to the parts by weight of each component, add 0.36 parts of water, 0.6 parts of magnesium chloride, and 0.03 parts of organic phosphoric acid in the first batching tank / maleic anhydride copolymer, 0.04 part of acrylic acid / 2-acrylamide-2-methylpropanesulfonic acid / polyvinylpyrrolidone copolymer, 0.03 part of sodium tripolyphosphate, and stirred for 80 minutes to obtain a mixed solution. Add 1 part of dead burnt magnesia, 0.08 part of magnesium carbonate, 0.4 part of calcium carbonate, 0.01 part of ultrafine silica with a particle size of 4 μm, and 0.03 part of ammonium phosphate into the second liquid mixing tank, and stir for 40 minutes to obtain a dry mixture. Finally, in the third liquid mixing tank, the mixed solution is stirred and reacted with the dry mix to obtain the cement slurry provided in Example 2.

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Abstract

The invention discloses an acid-soluble cement slurry and its preparation method and application, belonging to the fields of well drilling, well completion and fixed operations. The cement slurry is prepared from the following components in parts by weight: 0.8-1.2 parts of dead burnt magnesia, 0.5-1.0 parts of magnesium chloride, 0.05-0.15 parts of magnesium carbonate, 0.1-0.4 parts of calcium carbonate, and 0.01-0.05 parts of retarder , 0.03 to 0.06 parts of fluid loss reducer, 0.3 to 0.6 parts of water. The cement slurry, through the synergistic reaction of dead-burned magnesia, magnesium chloride, magnesium carbonate, calcium carbonate and other components, obtains an acid-soluble hydration product, so that the hardened cement slurry can be dissolved in the acid solution, thereby facilitating In the completion operation, dredge the cement cuttings in the perforation holes and fractures. By adding the fluid loss reducer and retarder and synergistically reacting with other components, the water loss of the cement slurry is reduced, the thickening and hardening speed of the cement slurry is slowed down, and the cement slurry has good fluidity. Moreover, the cement slurry has a long thickening time when the temperature is higher than 50° C., and can meet the requirements of oil and gas well cementing operations.

Description

technical field [0001] The invention relates to the fields of well drilling, well completion and fixed operations, in particular to an acid-soluble cement slurry and its preparation method and application. Background technique [0002] In oil and gas field cementing operations, it is necessary to pour cement slurry with good fluidity between the wellbore and casing. After the cement slurry hardens, it forms a cement sheath and seals off oil, gas, water, etc. in the formation to avoid oil, Gas, water, etc. enter the wellbore to damage the casing and prevent the wellbore from collapsing. In well completion operations, in order to improve production efficiency, perforation and fracturing operations can be used to create holes and cracks on the wall of the wellbore, and hardened cement chips are easy to remain in the holes and cracks, which are difficult to remove. Based on the above, it is very necessary to provide a cement slurry that has good fluidity and is easy to be remov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/32C09K8/467C09K8/487C04B24/16C08F271/02C08F220/58C08F220/06
CPCC04B24/163C04B28/32C04B2111/00724C04B2201/50C08F271/02C09K8/467C09K8/487C04B14/304C04B22/12C04B14/26C04B14/28C04B14/06C04B22/16C04B24/243C08F220/585
Inventor 席方柱孙富全刘爱萍熊钰丹邹建龙曾建国王翀李鹏晓
Owner BC P INC CHINA NAT PETROLEUM CORP
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