Plugging agent for fractured-vuggy oil reservoir

A technology of fracture-hole type and plugging agent, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of contradiction between strength and selectivity, high density of plugging agents, etc., to prevent leakage, ensure injection safety, low density effect

Active Publication Date: 2012-08-01
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the defects of existing plugging agents for fracture-cavity reservoirs such as high density, contradiction between strength and selectivity, and provide a plugging agent for fracture-cavity reservoirs. During the water plugging process of the reservoir, the plugging agent will not be lost due to the density, and the plugging agent can effectively stay and block the water outlet channel; the oil and water selectivity in the plugging water and the strength of the plugging agent are high, realizing high-intensity selective plugging water

Method used

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  • Plugging agent for fractured-vuggy oil reservoir
  • Plugging agent for fractured-vuggy oil reservoir
  • Plugging agent for fractured-vuggy oil reservoir

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Experimental program
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Embodiment 1

[0044] Cement (D 50 1μm) 45g (5.24% mass), micro silicon (D 50 60nm) 26g (3.03% quality), sodium bentonite 40g (4.66% quality), hydroxyethyl cellulose (viscosity-average molecular weight at 1 million) 4.7g (0.55% quality) are mixed, are made into mixed ash; 1.5g (0.17% quality) of calcium amine tetramethylene phosphonate, 0.8g (0.09% quality) of sodium carbonate aqueous solution of mass concentration 1% join in the paddle type stirrer that 741g water (86.26% quality) is housed, Make a mixed solution, then slowly add the mixed ash into the mixed solution, stir evenly, and form the laboratory plugging agent sample 1#. The water-cement ratio of this sample is 6.28.

Embodiment 2

[0046] Cement (D 50 0.9μm) 49g (5.74% mass), micro silicon (D 50 50nm) 28g (3.28% quality), sodium bentonite 43g (5.03% quality), hydroxyethyl cellulose (viscosity-average molecular weight at 1 million) 4.6g (0.54% quality) are mixed, are made into mixed ash; 1.6g (0.19% quality) of sodium amine tetramethylene phosphonate, 0.86g (0.10% quality) of sodium carbonate aqueous solution with a mass concentration of 1% were added to the paddle stirrer that 727g water (85.12% quality) was housed, Make a mixed solution, then slowly add the mixed ash into the mixed solution, stir evenly, and form the laboratory plugging agent sample 2#. The water-cement ratio of this sample is 5.72.

Embodiment 3

[0048] Cement (D 50 0.9μm) 54g (6.38% mass), micro silicon (D 50 40nm) 31g (3.66% quality), sodium bentonite 46g (5.43% quality), hydroxyethyl cellulose (viscosity-average molecular weight at 1,000,000) 4.5g (0.54% quality) mix, be made into mixed ash; Amine pentamethylene phosphonic acid 2.0g (0.24% quality), the sodium carbonate aqueous solution 0.92g (0.11% quality) of mass concentration 1% join in the paddle type stirrer that 708g water (83.64% quality) is housed, prepare to form a mixed solution, and then slowly add the mixed ash into the mixed solution, and stir evenly to form laboratory plugging agent sample 3#. The water-cement ratio of this sample is 5.11.

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Abstract

The invention provides a plugging agent for a fractured-vuggy oil reservoir, comprising the following materials in percentage by weight: 5.24-9.36% of cement, 3.03-5.35% of micro-silicon, 4.01-5.43% of sodium bentonite, 0.52-0.55% of polymer dispersant, 0.17-0.40% of retarder, sodium carbonate aqueous solution with sodium carbonate accounting for 0.0008-0.0011%, and residual amount water, wherein the water cement ratio of the plugging agent is 4.07-6.28. When the plugging agent is used for the water plugging of the fractured-vuggy oil reservoir, the loss of the plugging agent caused by density is avoided, and the plugging agent can effectively reside and plug a water outlet passage; and the oil-water selectivity and the plugging agent strength in water plugging are high, and high-strength selective water plugging is realized.

Description

technical field [0001] The invention relates to the field of chemical water shutoff of oil reservoirs, in particular to a plugging agent suitable for fracture-cavity oil reservoirs and a method for using the plugging agent to shut off water in oil reservoirs, which can realize effective treatment of oil wells with high water content. Background technique [0002] The petroleum geological reserves and production of carbonate reservoirs account for 50%-60% of the world's petroleum geological reserves and production, and have always occupied an important position in the development of oil and gas fields at home and abroad. Carbonate reservoirs are of various types, mainly including large-scale uplifts, reefs, buried hill reservoirs, etc. The main reservoir space types include primary pores, secondary pores, dissolution pores and fractures, and some oil and gas reservoirs develop large dissolution fractures , hole system. [0003] The reservoir shape of carbonate reservoirs det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/46
Inventor 何龙吴文明王世洁李桂平王雷杨建清詹兆文焦保雷
Owner CHINA PETROLEUM & CHEM CORP
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