Plugging bearing material for petroleum drilling, and preparation method and application thereof

A technology for oil drilling and pressure-bearing agent, applied in chemical instruments and methods, earth-moving drilling, wellbore/well components, etc., can solve the problems of poor construction safety, repeated leakage, early thickening, etc. The effect of pumping

Active Publication Date: 2011-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, this technology ① is sensitive to shear rate, and it is easy to cause early thickening due to high local instantaneous shear rate during preparation, and the construction safety is poor; ② lacks compression-resistant materials and hardness adjustment materials, and does not provide throat sealing effect of granular bridging materials, lack of pressure bearing capacity for leakage caused by larger fractures, and limited scope of application; ③lack of temperature parameters, for leakage in formations with high geothermal gradient, its safe performance is unknown
[0009] Judging from the application of the current plugging technology, the utilization rate of the chemical slurry plugging technology shows an increasing trend, but in terms of the overall application effect, several chemical slurry plugging technologies including special cement cannot be realized in the open hole section. Effective plugging, especially the pressure bearing capacity after plugging cannot reach the expected level, and the probability of repeated leakage after re-drilling is high, so more effective technical methods must be found

Method used

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  • Plugging bearing material for petroleum drilling, and preparation method and application thereof
  • Plugging bearing material for petroleum drilling, and preparation method and application thereof
  • Plugging bearing material for petroleum drilling, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116]Material compatibility plan: powder material (hydration expansion agent + anti-pressure agent) + mineral oil + surfactant complex agent + polymer solution, the specific compatibility is as follows:

[0117] (1) Measure 100ml of diesel oil, add OA 0.95g, SP-850.15g to dissolve;

[0118] (2) Take a small amount of water and add K-120.28g to dissolve, then add to the solution obtained in step (1);

[0119] (3) Add 110 g of bentonite, 12 g of MgO, 10 g of fly ash, 7 g of limestone powder, and 3 g of slag in sequence to the solution obtained in step (2), and stir for 1 hour.

[0120] (4) Measure 100ml of water, add 0.5g of polyacrylamide, after complete dissolution, add 3g of walnut shells with a particle size range of 0.1-5mm to form a stable dispersion. Use the polymer dispersion with a rated displacement of 20-30m 3 / h small centrifugal pump evenly and slowly added to the solution obtained in step (3), and continued to stir for 30 minutes until a stable mixed fluid was f...

Embodiment 2

[0124] Material compatibility scheme: powder material (hydration expansion agent + hardness modifier + anti-pressure agent) + mineral oil + surfactant complex agent + polymer glue (that is, polymer aqueous solution), the specific compatibility is as follows:

[0125] (1) Measure 100ml of diesel oil, add OA 1g, EO-500.13g to dissolve;

[0126] (2) A small amount of water was added to G-2630.35g to dissolve, and then added to the solution obtained in step (1);

[0127] (3) add 117g bentonite, 15g MgO, 13g fly ash, 5g cement, 8g limestone powder, 4g slag, 2g silica fume successively in the solution that step (2) obtains, stir 1 hour;

[0128] (4) Measure 100ml of water, add 0.6g of polyacrylamide, after completely dissolving, add 3.5g of walnut shells with a particle size ranging from 0.1 to 5mm to form a stable dispersion. Use the polymer dispersion with a rated displacement of 20-30m 3 / h small centrifugal pump evenly and slowly added to the solution obtained in step (3), and...

Embodiment 3

[0132] Material compatibility scheme: powder material (hydration expansion agent + anti-pressure agent) + mineral oil + surfactant complex agent + polymer glue liquid, the specific compatibility is as follows:

[0133] (1) Measure 100ml of diesel oil, add OA 0.15g, SP-850.8g, EO-500.3g to dissolve;

[0134] (2) A small amount of water was added to G-2630.15g to dissolve, and then added to the solution obtained in step (1);

[0135] (3) add 100g bentonite, 13g MgO, 12g fly ash, 3g cement, 7g limestone, 4.5g slag, 1g silica fume successively in the solution that step (2) obtains, stir 1 hour;

[0136] (4) Measure 100ml of water, add 0.65g of polyacrylamide, after complete dissolution, add 3.5g of walnut shell with a particle size range of 0.1-5mm, and 0.5g of Lett fiber material to form a stable dispersion. Use the polymer dispersion with a rated displacement of 20-30m 3 / h small centrifugal pump evenly and slowly added to the solution obtained in step (3), and continued to st...

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Abstract

The invention provides a plugging bearing material for petroleum drilling, and a preparation method and application thereof. The plugging bearing material comprises the following components: 900 to 1,200 kilograms of bentonite, 100 to 220 kilograms of magnesium oxide, 90 to 160 kilograms of fly ash, 0 to 80 kilograms of hardness regulator, 90 to 210 kilograms of compression resisting agent, 0.15 to 5.8 kilograms of hydrophilic surfactant, 8.3 to 13.0 kilograms of hydrophobic surfactant and 3 to 8 kilograms of water-soluble organic high polymer material. A plugging material formed by the plugging bearing material has high fracture plugging capability, and a plugging belt formed by the plugging bearing material plays a certain stable role in fracturing rocks. The plugging bearing material, and the preparation method and the application thereof are suitable for processing formation leakage of various forms.

Description

technical field [0001] The invention relates to the field of oil drilling, and more specifically relates to a plugging and pressure-retaining agent for oil drilling, a preparation method and application thereof. Background technique [0002] In the process of exploration and development of oil and natural gas, lost circulation is a common phenomenon, especially in limestone formations, piedmont structural belts, fractured and fractured formations caused by in-situ stress concentration, where lost circulation occurs during drilling. Inevitable and often severe. According to statistical data, the incidence of lost circulation in the world can account for about 20-25% of the total number of wells, and the treatment of lost circulation, especially complex lost circulation, is a difficult technical problem in oil drilling operations. The practice of plugging shows that it is very difficult to deal with the loss of drilling fluid in fractures, cave formations and large-pore high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42E21B33/13
Inventor 蔡利山刘金华金军斌苏长明石秉忠王治法刘贵传
Owner CHINA PETROLEUM & CHEM CORP
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