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A plugging agent for oil-water well plugging blast hole and casing plugging in oil field

A technology of oil-water well and plugging agent, which is applied in the field of plugging materials, can solve the problems of slow growth of oil well cement strength, plugging cycle, and production-occupied space consumption of operations, so as to shorten the workover period and operation-occupied time, and shorten the waiting period. Setting time, fast hardening effect

Active Publication Date: 2016-04-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the early strength of oil well cement increases slowly, and the increase in compressive strength is calculated on a daily basis. After the completion of the plugging construction, according to the well temperature, the plug can be drilled after 3 to 5 days of solidification, resulting in invalid time such as plugging cycle and operating production. Empty consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] First take 80 parts by weight of sulfoaluminate clinker or fluoroaluminate clinker, 5 parts by weight of anhydrite, 40 parts by weight of microsilica and 5 parts by weight of anhydrous sodium sulfate to make a specific surface area ≥ 360m 2 The hydraulic gelling material of / Kg; Get the tartaric acid of 5 weight parts, the citric acid of 0.1 weight part, the boric acid of 10 weight parts and the water of 80 weight parts to make density be 1.8g / cm 3 retarder aqueous solution; when used in the oil field, according to hydraulic cementitious material: retarder aqueous solution=1:0.4 parts by weight, the density is 1.75g / cm 3 1. The slurry with a water-cement ratio of 0.5 is injected into the oil-water well by a pump truck.

Embodiment 2

[0016] First take 40 parts by weight of sulfoaluminate clinker or fluoroaluminate clinker, 20 parts by weight of anhydrite, 10 parts by weight of microsilica and 10 parts by weight of anhydrous sodium sulfate to make a specific surface area ≥ 360m 2 The hydraulic gelling material of / Kg; Get the tartaric acid of 0.1 weight part, the citric acid of 15 weight parts, the boric acid of 5 weight parts and the water of 95 weight parts to make density be 1.6g / cm 3 retarder aqueous solution; when used in the oil field, according to hydraulic cementitious material: retarder aqueous solution = 1:0.8 parts by weight to make a density of 1.6g / cm 3 , The slurry with a water-cement ratio of 0.7 is injected into the oil-water well with a pump truck.

Embodiment 3

[0018] First take 60 parts by weight of sulfoaluminate clinker or fluoroaluminate clinker, 12 parts by weight of anhydrite, 25 parts by weight of microsilica and 8 parts by weight of anhydrous sodium sulfate to make a specific surface area ≥ 360m 2 The hydraulic gelling material of / Kg; Get the tartaric acid of 3 weight parts, the citric acid of 7 weight parts, the boric acid of 7 weight parts and the water of 85 weight parts to make density be 1.7g / cm 3 retarder aqueous solution. When used in the oil field, the density is 1.7g / cm according to the ratio of hydraulic cementitious material: retarder aqueous solution = 1: 0.6 parts by weight 3 , The slurry with a water-cement ratio of 0.6 is injected into the oil-water well by a pump truck.

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Abstract

The invention provides a plugging agent for plugging oil-water well blast holes and casing pipe leakage parts in an oil field. The plugging agent comprises a plugging preparation and a retarder. The plugging preparation is hydraulic concrete powder prepared from 40-80 parts by weight of sulphoaluminate clinker or fluoroaluminate clinker, 5-20 parts by weight of anhydrite, 10-40 parts by weight of silica fume and 5-10 parts by weight of anhydrous sodium sulfate. The retarder is a retarder aqueous solution comprising 0.1-5 parts by weight of tartaric acid, 0.1-15 parts by weight of citric acid, 5-10 parts by weight of boric acid and 80-95 parts by weight of water.

Description

technical field [0001] The invention relates to a plugging material for blast hole plugging, casing plugging, and oil and water well cement plugging operations in oil fields. Background technique [0002] After many years of oilfield development, especially after entering the ultra-high water-cut period, on the one hand, there are contradictions in the aspects of oil well perforation layers and large differences between layers, and on the other hand, there are also problems of casing damage. For this reason, combined with the advantages of high plugging strength and low price of cement-based plugging agents, the oil field has increased the research and application of cement-based plugging agents in oil well plugging of blastholes and casing leakage plugging, and actively addressed the problems in the implementation. A lot of research and improvement have been carried out. On the basis of ordinary G-grade oil well cement and ultra-fine oil well cement, by adding various addit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14C04B24/06C04B103/22
CPCC04B28/16C09K8/467Y02W30/91C04B7/323C04B18/146C04B22/0013C04B24/06
Inventor 高国强谢文献高学生周喜吕建海崔洁许建华李力徐忠王建
Owner CHINA PETROLEUM & CHEM CORP
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