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Oil-layer blasthole plugging agent at low temperature

A plugging agent and oil layer technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of poor formation adaptability, poor construction safety, and large leakage, so as to improve the success rate of construction, reduce the dosage, The effect of improving the effective period of construction

Active Publication Date: 2008-05-14
DAQING OILFIELD CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a plugging agent for blastholes in low-temperature oil reservoirs, which solves the problems of large leakage of conventional plugging agents, interface shrinkage after solidification, poor adaptability to formations and poor construction safety

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Well Bei 1-Ding 4-P62 is a water injection well. The plugging layer of Pu I1,1 in this well is 1047.8-1051.4m in the plugging section, 3.6m in thickness, and 42°C in the reservoir. The low-temperature oil layer blast hole plugging agent is a product formulated according to the following weight percentage: the molecular weight is 2300×10 4 17% of polypropylene microfibers; 18% of ultra-fine expansion cement; 45% of tricalcium silicate; 13.8% of 800# Portland cement; 1.2% of industrial calcium sulfate; %. After all the above materials are mixed, grind them so that the particle size is controlled at a 200-mesh sieve and all pass through. The plugging agent was tested indoors at 45°C, the initial setting time was about 3.5 hours, and the complete setting time was about 5.5 hours. Prepare water 3.0m during on-site construction 3 , add 4.2t of blasthole plugging agent, fully stir evenly, and the density of the prepared plugging agent suspension is 1.55g / cm 3 ....

Embodiment 2

[0014] Example 2: Well Bei 1-321-P37 is an oil production well, the well is plugged in layer Sa II14-16, the plugged well section is 991.9-999.0m, the thickness of the shot is 7.1m, and the temperature of the oil layer is 43°C. The low-temperature oil layer blast hole plugging agent is a product formulated according to the following weight percentage: the molecular weight is 2500×10 4 15% of polypropylene microfiber; 16% of superfine expansion cement; 49% of tricalcium silicate; 14.5% of 800# Portland cement; 1.5% of industrial calcium chloride; Tannins 4%. After all the above materials are mixed, grind them so that the particle size is controlled at a 200-mesh sieve and all pass through. The plugging agent was tested indoors at 45°C, the initial setting time was about 3 hours, and the complete setting time was about 5 hours. Prepare 3.5m of water during on-site construction 3 , add 4.9t of blasthole plugging agent, fully stir evenly, and the density of the prepared pluggin...

Embodiment 3

[0015] Example 3: Well Bei 1-Ding 5-P141 is a water injection well. The well is plugged in layer Pu I2, the plugged well section is 1023.5-1028.6m, the penetration thickness is 5.1m, and the reservoir temperature is 42°C. The low-temperature oil layer blast hole plugging agent is a product formulated according to the following weight percentage: the molecular weight is 2400×10 4 17% of polypropylene microfibers; 18% of ultra-fine expansion cement; 45% of tricalcium silicate; 13.8% of 800# Portland cement; 1.2% of industrial calcium sulfate; %. After mixing all the above materials, grind them so that the particle size is controlled at 200 mesh and all the sieves pass through. The plugging agent is tested indoors at 45°C. The initial setting time is about 3.5 hours, and the complete setting time is about 5.5 hours. Prepare water 4.0m during on-site construction 3 , add 5.6t of blasthole plugging agent, fully stir evenly, and the density of the prepared plugging agent suspensi...

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Abstract

A low-temperature oil-layer hole sealing agent consists of 15-19% ultrahigh molecular polypropylene fine fiber, 16-20% superfine expansion cement, 40-50% tricalcium silicate, 12-16% active microcrystalline reinforcing agent and 3-5% sulfonated Danin. It is safe and convenient, has better adaptive and comprehensive performances.

Description

Technical field: [0001] The invention relates to an oil field blast hole plugging agent, which belongs to a low temperature oil layer blast hole plugging agent. Background technique: [0002] In the process of oilfield development, most of the oil wells are combined production of oil layers above the second layer. After the oilfield enters the high water-cut period, the injected water rushes along the high-permeability layer, making the high-permeability layer a high-pressure layer, which affects the normal liquid and oil production of the middle and low permeability layers; at the same time, due to long-term water injection development, the remaining oil in the high-permeability layer The saturation is reduced, and the utilization value is reduced under the current technical conditions. Therefore, it is necessary to seal off some high-permeability layers; during the development process, the adjustment of the developed layer system according to the plan also requires pluggin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/42
Inventor 王研任刚何光中张树人何永瑞
Owner DAQING OILFIELD CO LTD
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