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High-temperature-resistant while-drilling plugging agent and preparation method thereof

A technology of plugging while drilling and resisting high temperature, applied in chemical instruments and methods, drilling composition, etc., can solve problems such as reducing fluid loss, reduce fluid loss, maintain wellbore stability, and avoid repeatability missing effects

Inactive Publication Date: 2012-07-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the leakage problem existing in the current drilling process, and to provide a high-temperature-resistant random plugging that can stop the leakage while drilling without affecting the performance of the mud and can reduce the fluid loss. Drill plugging agent

Method used

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  • High-temperature-resistant while-drilling plugging agent and preparation method thereof
  • High-temperature-resistant while-drilling plugging agent and preparation method thereof
  • High-temperature-resistant while-drilling plugging agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dissolve 0.3g of cetyltrimethylammonium bromide in 30mL of water, add 70g of styrene, 3.5g of divinylbenzene, and 3.0g of azobisisobutyronitrile under continuous stirring The mixture of initiator and 3.6g of cumene peroxide initiator, after the addition of the emulsion to form an emulsion, raise the temperature of the system to 50°C, after 8 hours of polymerization to obtain the powder, weigh 10.0g of the powder and add it to 5.0g of n-octanol in; then 1.5g of acrylamide and 1.0g of N'N-methylenebisacrylamide were dissolved in 15.0mL of aqueous solution, added to the polystyrene powder swollen by n-octanol for 2 hours, and mixed evenly, Add 0.20 g of ferrous sulfate in 5.0 mL of aqueous solution under stirring, and the reaction is completed within 3 minutes to obtain a high-temperature resistant LWD plugging agent.

Embodiment 2

[0031] Dissolve 0.3g of cetyltrimethylammonium bromide in 30mL of water, add 70g of styrene, 7.0g of divinylbenzene, and 3.0g of azobisisobutyronitrile under continuous stirring The mixed solution of initiator and 3.6g of hydroxycumene peroxide initiator, after the feeding is completed to form an emulsion, the system is warmed up to 55°C, after 7 hours of polymerization to obtain powder, weigh 10.0g of powder and add it to 6.0g of n-octanol in; then 1.5g of acrylamide and 1.0g of N'N-methylenebisacrylamide were dissolved in 15.0mL of aqueous solution, added to the polystyrene powder swollen by n-octanol for 5h, after mixing evenly, Add 0.20 g of ferrous sulfate in 5.0 mL of aqueous solution under stirring, and the reaction is completed within 3 minutes to obtain a high-temperature resistant LWD plugging agent.

Embodiment 3～7

[0032] Embodiment 3~7: step is identical with embodiment 1, and reactant and consumption table are as shown in table 1:

[0033] Table 1 Example of a high temperature resistant LWD plugging agent and its preparation method

[0034]

[0035]

[0036] After drying the LWD plugging agent obtained in Examples 1, 2, 3, and 4, the surface is sprayed with gold, and its microscopic morphology is observed under a scanning electron microscope as follows: figure 1 Middle a, b, c, d. Depend on figure 1 It can be seen that the particle size of the anti-high temperature LWD plugging agent obtained in the present invention is micron-scale, and the particle size is distributed between 2-25 μm; by adjusting the amount of oil-soluble cross-linking agent D, high-temperature anti-WD with different particle sizes can be obtained. It is a leak-stopping agent that can expand in volume when it meets water and oil, and can be used to plug a wide range of micro-cracks and pores.

[0037] Add t...

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Abstract

The invention relates to a high-temperature-resistant while-drilling plugging agent and a preparation method thereof and belongs to the technical field of oil field chemical drilling fluid treating agents. The method comprises the following steps: preparing a stable emulsion from an oil soluble monomer A, an oil soluble crosslinking agent B, an azo-type initiator, an organic hydroperoxide and water in the presence of an emulsifier, and polymerizing the stable emulsion to obtain a powder M; and swelling the powder M by use of a swelling agent, adding a water soluble monomer C, a water soluble crosslinking agent D and a reductive initiator into the swelled powder M, and polymerizing the mixture at the room temperature to obtain the high-temperature-resistant while-drilling plugging agent. The high-temperature-resistant while-drilling plugging agent is in a powder shape, has relatively high temperature resistance, can resist the temperature up to 180 DEG C, and can be used for performing while-drilling plugging on deep wells and supper deep wells. The while-drilling plugging agent can be used for quickly effectively plugging the permeability leak, the micro order crack and gap leak, avoiding the repeated leak, participating in the formation of a filter cake, keeping the stability of a well wall and obviously reducing the drilling filler loss and the pollution to a reservoir, has no influence on the rheological property of the drilling fluid and has the advantages of good compatibility with various drilling fluid systems and relatively good combination property.

Description

technical field [0001] The invention relates to an anti-high temperature plugging agent while drilling and a preparation method thereof, which belongs to the technical field of oilfield chemical drilling fluid treatment agents. Background technique [0002] Leakage prevention and plugging during drilling has always been one of the research topics of drilling workers. Leakage often leads to a series of downhole complex situations such as pipe sticking, blowout, and well collapse, which seriously restrict the improvement of drilling speed. The leakage during reservoir drilling also has a negative impact on the protection of oil and gas layers. The technology adopted for the treatment of lost circulation at home and abroad is generally "equal emphasis on prevention and plugging". In terms of plugging, bridge plugging and shear thickening are generally used. Liquid plugging, plugging with superabsorbent materials, liquid sleeves, etc. are suitable for permeability and fracture l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F257/02C08F220/56C08F222/38C08F220/06C08F220/58C09K8/035C09K8/42
Inventor 王建莉张丽君郑志军郭建华王中华周亚贤孙举
Owner CHINA PETROLEUM & CHEM CORP
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