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Acid-soluble cement temporary plugging agent and preparation method thereof

A temporary plugging agent, acid-soluble technology, applied in the field of oil well cementing, can solve problems such as temporary plugging of untargeted reservoirs, and achieve the effect of wide application, reducing water loss and ensuring permeability

Active Publication Date: 2017-12-15
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] The magnesia cement temporary plugging agent provided by the existing technology is used to temporarily plug the target reservoir. When the temperature in the oil well is higher than 50°C, the setting time of the magnesia cement temporary plugging agent is less than 30 minutes, causing the magnesia cement The temporary plugging agent has already condensed before reaching the target reservoir, so it is impossible to temporarily plug the target reservoir

Method used

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  • Acid-soluble cement temporary plugging agent and preparation method thereof
  • Acid-soluble cement temporary plugging agent and preparation method thereof
  • Acid-soluble cement temporary plugging agent and preparation method thereof

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preparation example Construction

[0034] In the second aspect, the embodiment of the present invention provides a method for preparing an acid-soluble cement temporary plugging agent, which specifically includes the following steps:

[0035] Prepare a mixed solution of setting retarder, fluid loss reducer, magnesium chloride, sodium tripolyphosphate and water, prepare a mixed dry powder of dead burnt magnesia, superfine silica, ammonium phosphate, magnesium carbonate and calcium carbonate, and mix The dry powder and the mixed solution are added into the blade stirrer and stirred to obtain the acid-soluble cement temporary plugging agent.

[0036] Specifically, for the preparation process of acid-soluble cement temporary plugging agent, refer to the preparation method of oil well cement described in Chapter 5 of GB / T19139-2012, and determine the type of blade agitator that should be used accordingly. At the same time, the stirring speed is selected as 12000rpm, and the mixing time is selected as 35s, so that th...

Embodiment 1

[0044] This embodiment provides an acid-soluble cement temporary plugging agent, which includes the following components by weight: 1 weight part of dead-burned magnesia, 0.5 weight part of magnesium chloride, 0.1 weight part of magnesium carbonate, 0.3 Calcium carbonate of parts by weight, sodium tripolyphosphate of 0.01 parts by weight, superfine silicon dioxide of 0.006 parts by weight, ammonium phosphate of 0.02 parts by weight, retarder of 0.01 parts by weight, fluid loss reducing agent of 0.03 parts by weight, 0.38 parts by weight of water.

[0045] Among them, dead-burned magnesite is prepared by calcining magnesite at 1400°C, the average particle size of ultrafine silica is 10nm, and the retarder is a copolymer of organic phosphoric acid and maleic anhydride to reduce dehydration. The agent is a terpolymer of 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid, and N-vinylpyrrolidone.

[0046] Specifically, the copolymer of organic phosphoric acid and maleic anhyd...

Embodiment 2

[0051] This embodiment provides an acid-soluble cement temporary plugging agent, which includes the following components by weight: 1 weight part of dead-burned magnesia, 0.6 weight part of magnesium chloride, 0.08 weight part of magnesium carbonate, 0.4 Calcium carbonate of parts by weight, sodium tripolyphosphate of 0.03 parts by weight, superfine silicon dioxide of 0.01 parts by weight, ammonium phosphate of 0.03 parts by weight, retarder of 0.03 parts by weight, fluid loss reducer of 0.04 parts by weight, 0.36 parts by weight of water.

[0052] Among them, dead-burned magnesite is prepared by calcining magnesite at 1500°C, the average particle size of ultrafine silica is 30nm, and the retarder is a copolymer of organic phosphoric acid and maleic anhydride to reduce dehydration. The agent is a terpolymer of 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid, and N-vinylpyrrolidone.

[0053] Specifically, the copolymer of organic phosphoric acid and maleic anhydride is...

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Abstract

The invention discloses an acid-soluble cement temporary plugging agent and a preparation method thereof, and belongs to the field of oil well cementation. The temporary plugging agent comprises, by weight part, 1 part of reheated 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 sodium tripolyphosphate, 0.005-0.01 part of ultrafine silica, 0.01-0.04 part of ammonium phosphate, 0.01-0.05 part of a retarder, 0.03-0.06 part of a fluid loss additive, and 0.3-0.6 part of water. According to the provided acid-soluble cement temporary plugging agent, the retarder can adjust the setting time of the acid-soluble cement temporary plugging agent and makes the acid-soluble cement temporary plugging agent suitable for an oil well of 30-100 DEG C, so that it is ensued that an oil well with relatively high temperature is temporarily plugged. The fluid loss additive can improve the plugging ability of the acid-soluble cement temporary plugging agent and reduces the water loss of the acid-soluble cement temporary plugging agent, so that the plugging effect on the reservoir is ensured. The acid-soluble cement temporary plugging agent is wide in application range, good in temporary plugging effect, and suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to the field of oil well cementing, in particular to an acid-soluble cement temporary plugging agent and a preparation method thereof. Background technique [0002] When drilling an oil well, in order to ensure the stability of the oil well wall during the drilling process and prevent mutual leakage between the underground oil layer, water layer, natural gas and other reservoirs, it is necessary to carry out the reservoir between the casing in the oil well and the oil well wall. Plugging to avoid wellbore collapse and reservoir leakage. After the oil well is drilled, it is necessary to remove the plugging of the reservoir between the casing and the well wall and restore the permeability of each reservoir, so that the crude oil and natural gas in the reservoir can enter the bottom of the oil well and pass through the oil well. Oil pipes are transported to the surface. Therefore, it is very important to provide a temporary pluggin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/487C04B28/32C04B14/06C04B22/10C04B22/16C04B103/22C04B103/46
CPCC04B28/32C04B2111/00724C09K8/426C09K8/487C04B22/10C04B22/16C04B14/062C04B2103/22C04B2103/46
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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