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Acid-soluble cement paste, and preparation method and application thereof

A cement slurry and acid-soluble technology, which is applied in well completion and fixed operations, and drilling fields, can solve the problems of incomplete dissolution of cement debris, unsatisfactory magnesia cement slurry, and poor fluidity, achieving long thickening time and reducing Effect of water loss, thickening and hardening speed reduction

Active Publication Date: 2018-12-04
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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  • Acid-soluble cement paste, and preparation method and application thereof
  • Acid-soluble cement paste, and preparation method and application thereof
  • Acid-soluble cement paste, and preparation method and application thereof

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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 acid-soluble cement paste, and a preparation method and application thereof, and belongs to the field of well drilling, well completion and fixed operation. The cement paste isprepared from the following components in parts by weight: 0.8-1.2 parts of dead-burned magnesia, 0.5-1.0 part of magnesium chloride, 0.05-0.15 part of magnesium carbonate, 0.1-0.4 part of calcium carbonate, 0.01-0.05 part of a retarder, 0.03-0.06 part of a fluid loss agent and 0.3-0.6 part of water. According to the cement paste, the dead-burned magnesia, the magnesium chloride, the magnesium carbonate and the calcium carbonate are adopted to synergistically react with other components, and an acid-soluble hydration product is obtained, so that hardened cement paste can be dissolved in an acid solution conveniently, and further cement chips in perforation holes and cracks can be dredged conveniently in a well completion operation. The water loss agent and the retarder are added to synergistically react with other components, so that the water loss of the cement paste is reduced, the thickening and hardening speeds of the cement paste are reduced, and further the cement paste has goodfluidity. The thickening time of the cement paste at the temperature larger than 50 DEG C is long, and the cement paste can meet the requirements of the well cementing operation of an oil-gas well.

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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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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