High-temperature-resistant and high-salt-resistant hydrophobic blocking agent and preparation method thereof

A technology of high temperature resistance and plugging agent, applied in the field of drilling, can solve the problem of not considering salt resistance and other problems, and achieve the effects of efficiently stabilizing wellbore, reducing filtration loss and improving compactness

Pending Publication Date: 2022-07-01
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN112812245A provides a kind of anti-high-temperature and pressure-resistant plugging agent for water-based drilling fluid and its preparation method. In the case of adding 1%, the API of freshwater base slurry aged at 200°C is 9.2ml, but it does not consider the problem of salt resistance
CN111499790B provides a kind of anti-high temperature polymer microsphere nano plugging agent for water-based drilling fluid and its preparation method, its API after aging at 180 ℃ is 26ml, but it does not consider the problem of salt resistance
CN113292973 provides a kind of anti-high temperature silicon dioxide grafted tertiary amine nano plugging agent and water-based drilling fluid, its API is 2.07ml after aging at 150°C, and the plugging rate is 77.52%, but it does not consider the problem of salt resistance

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  • High-temperature-resistant and high-salt-resistant hydrophobic blocking agent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] In this embodiment, the high temperature and high salt hydrophobic blocking agent is modified by 10 parts by mass of SiO 2 , 5 parts of sodium lauryl sulfate, 20 parts of acrylamide, 15 parts of methacryloyloxyethyltrimethyl ammonium chloride, 2 parts of octadecyl methacrylate, 0.25 parts of initiator benzyl peroxide It is prepared from acyl and appropriate amounts of acetone and water.

[0028] In this embodiment, the modified SiO 2 40 parts by mass of SiO 2 , 5 parts of KH570, 1 part of initiator benzoyl peroxide (BPO), an appropriate amount of anhydrous ethanol, an appropriate amount of pH regulator triethylamine and an appropriate amount of water.

[0029] In this example, the modified SiO 2 The preparation method is:

[0030] 1) Weigh 40 parts by mass of SiO 2 , added to 100 parts of absolute ethanol, magnetic stirring to make it fully dispersed;

[0031] 2) Weigh 5 parts of KH570 in mass fraction and add it to 100 parts of water / absolute ethanol system, magn...

Embodiment 2

[0041] In this embodiment, the high temperature and high salt hydrophobic blocking agent is modified by 5 parts by mass of SiO 2 , 5 parts of sodium lauryl sulfate, 20 parts of acrylamide, 15 parts of methacryloyloxyethyltrimethyl ammonium chloride, 2 parts of octadecyl methacrylate, 0.25 parts of initiator benzyl peroxide It is prepared from acyl and appropriate amounts of acetone and water.

[0042] In this embodiment, the modified SiO 2 40 parts by mass of SiO 2 , 5 parts of KH570, 1 part of initiator benzoyl peroxide (BPO), an appropriate amount of anhydrous ethanol, an appropriate amount of pH regulator triethylamine and an appropriate amount of water.

[0043] In this example, the modified SiO 2 The preparation method is:

[0044] 1) Weigh 40 parts by mass of SiO 2 , added to 100 parts of absolute ethanol, magnetic stirring to make it fully dispersed;

[0045]2) Weigh 5 parts of KH570 by mass fraction and add it to 100 parts of water / absolute ethanol system, magnet...

Embodiment 3

[0055] In this embodiment, the high temperature and high salt hydrophobic blocking agent is modified by 10 parts by mass of SiO 2 , 5 parts of sodium lauryl sulfate, 15 parts of acrylamide, 20 parts of methacryloyloxyethyl trimethyl ammonium chloride, 3 parts of octadecyl methacrylate, 0.5 parts of initiator benzyl peroxide It is prepared from acyl and appropriate amounts of acetone and water.

[0056] In this embodiment, the modified SiO 2 70 parts by mass of SiO 2 , 7 parts of KH570, 1.5 parts of initiator benzoyl peroxide (BPO), an appropriate amount of absolute ethanol, an appropriate amount of pH regulator triethylamine and an appropriate amount of water.

[0057] In this example, the modified SiO 2 The preparation method is:

[0058] 1) Weigh 70 parts by mass of SiO 2 , added to 100 parts of absolute ethanol, magnetic stirring to make it fully dispersed;

[0059] 2) Weigh 7 parts of KH570 in mass fraction and add it to 100 parts of water / absolute ethanol system, ma...

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Abstract

The invention relates to the technical field of well drilling, in particular to a high-temperature-resistant and high-salt-resistant hydrophobic blocking agent and a preparation method thereof. The high-temperature-resistant and high-salt-resistant hydrophobic blocking agent is prepared from 5 to 10 parts by mass of modified SiO2, 2 to 5 parts by mass of lauryl sodium sulfate, 10 to 20 parts by mass of acrylamide, 10 to 20 parts by mass of methacryloyloxyethyl trimethyl ammonium chloride, 2 to 6 parts by mass of octadecyl methacrylate, 0.2 to 0.5 part by mass of an initiator and a proper amount of acetone and water. According to the SiO2 graft polymer prepared through polymerization, the blocking effect is achieved through SiO2, the surface of SiO2 is hydrophobic through a long-chain alkyl chain and an ester group, and then the surface of a mud cake or a stratum pore is hydrophobic while tiny pores in the mud cake and pores in the stratum are blocked, so that invasion of water molecules is more effectively prevented, the compactness of the mud cake is improved, and the water permeability of the mud cake is improved. The filtrate loss is reduced, the filtrate loss reduction performance of the drilling fluid at high temperature and high salt is enhanced, formation pores and cracks are blocked, and the effect of efficiently stabilizing a well wall is achieved.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a high-temperature and high-salt hydrophobic plugging agent and a preparation method thereof. Background technique [0002] With the current rapid expansion and increase of my country's demand for oil and natural gas, the degree of dependence on crude oil and natural gas has increased year by year, and new replacement oil and gas resources are urgently needed. According to the results of the second national oil and gas resource evaluation, my country's oil and gas (shale gas, oil shale, deep layers, etc.) resources have great potential for development. The efficient development of these oil and gas resources has important practical significance for improving my country's energy security level. One of the powerful measures to alleviate the pressure of my country's energy dependence on foreign countries is also a major guarantee for maintaining national energy security. The effici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/56C08F220/34C08F220/18C09K8/508C09K8/88
CPCC08F292/00C09K8/5083C09K8/882C08F220/56C08F220/34C08F220/1818
Inventor 孙金声刘敬平屈沅治吕开河王韧徐加放张志磊张雁杨峥高世峰任晗
Owner BC P INC CHINA NAT PETROLEUM CORP
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