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High-temperature-resistant and high-salinity-resistant water-plugging profile control agent, and preparation method and application thereof

A water profile control agent and high salinity technology, applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve problems such as high salinity, production reduction, well shut-in, etc., and achieve cross-linking powerful effect

Active Publication Date: 2012-07-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some literatures in the prior art have reported high-temperature-resistant and high-salinity polymer gel-based water plugging and profile control agents, these water plugging and profile control agents generally have weak gel strength and a short stable period. Difficult to popularize in practical application
Due to the high mineralization of formation water, some oil wells cannot take measures such as water shutoff and profile control, and the production is reduced or even shut down due to high water cut. This has become an urgent problem that plagues the sustainable development of oilfields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Make a solution of 5.5 g of partially hydrolyzed polyacrylamide (HPAM) with a molecular weight of 15 million and a degree of hydrolysis of 20% with 994.5 g of water with a salinity of 131525 mg / L, stir evenly, adjust the pH value to 5.0 with oxalic acid, and place it for 2 hours To fully ripen, add 0.5g thiourea, 2.5g benzaldehyde, 1.5g phenol, 1.25g aluminum citrate, 0.2g cyclodextrin and 0.25g m-phenylenediamine in sequence, stir well and place in 85°C constant temperature water bath for 48h , forming a gel. Observe the gelation situation, and measure the viscosity of the gel at 85° C. with a SNB-2 digital display viscometer to be 126580 mPa.s. The same formulation experiment was placed in an aging kettle at a constant temperature of 100°C for 11 months, and the gel had no obvious dehydration phenomenon, and the viscosity could still reach 78495mPa.s.

[0030] The water plugging profile control agent of this embodiment was used to carry out the plugging simulation ex...

Embodiment 2

[0032] Make a solution with 4.5 g of partially hydrolyzed polyacrylamide (HPAM) with a molecular weight of 20 million and a degree of hydrolysis of 25% with 995.5 g of water with a salinity of 98052 mg / L, adjust the pH value to 5.5 with oxalic acid under stirring, and place it for aging For 2 hours, add 0.6g thiourea, 2.0g benzaldehyde, 1.15g resorcinol, 1.35g aluminum citrate, 0.4g cyclodextrin and 0.3g m-phenylenediammonium in sequence, and observe the gelation at 110°C. When the gelation time is 32h, the gel viscosity of the water plugging and profile control agent is measured at 110°C with a SNB-2 digital display viscometer to be 72560mPa.s. The same formula experiment was placed in an aging kettle at a constant temperature of 110°C for 12 months, the gel did not have obvious dehydration phenomenon, and the viscosity could still reach 49656mPa.s.

[0033]The water plugging profile control agent of this embodiment was used to carry out the plugging simulation experiment in ...

Embodiment 3

[0035] Make a solution with 8g of partially hydrolyzed polyacrylamide (HPAM) with a molecular weight of 25 million and a degree of hydrolysis of 25% with 992g of water with a salinity of 120765mg / L, adjust the pH value to 5.0 with oxalic acid under stirring, and place it for aging for 2 hours , add 0.6g thiourea, 2.5g paraformaldehyde, 1.3g phenol, 1.2g aluminum citrate, 0.5g cyclodextrin and 0.25g m-phenylenediamine in turn, observe the gelling situation at 120°C, when the gelling time is At 36 hours, the gel viscosity of the water plugging and profile control agent was measured at 120°C with a SNB-2 digital display viscometer to be 84856mPa.s. The same formulation experiment was placed in an aging kettle at a constant temperature of 120°C for 11 months, and the gel had no obvious dehydration phenomenon, and the viscosity could still reach 45620mPa.s.

[0036] The water plugging profile control agent of this embodiment was used to carry out the plugging simulation experiment ...

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Abstract

The invention relates to a high-temperature-resistant and high-salinity-resistant water-plugging profile control agent, and a preparation method and application thereof. The water-plugging profile control agent comprises polyacrylamide, a composite crosslinking agent, cyclodextrin, metaphenylene diamine and deoxidant, wherein the composite crosslinking agent consists of aldehyde, phenol and aluminum citrate; the aldehyde is one or the combination of benzaldehyde and paraformaldehyde; and the phenol is one or more of phenol, resorcinol and hydroquinone. The water-plugging profile control agent can resist the temperature of 120 DEG C, can be directly prepared by using water with mineralization degree of 150,000 mg / L, and has high crosslinking performance and long-term stability. The preparation method for the water-plugging profile control agent is simple, convenient to operate, and easy to control, and water-plugging profile control agent has a good plugging effect, and construction can be performed after the water-plugging profile control agent is directly prepared on site.

Description

technical field [0001] The invention belongs to the enhanced oil recovery technology for oil field development, and specifically relates to a water plugging profile control agent and its preparation method and application. It has the characteristics of high temperature resistance and high salinity, and has strong crosslinking ability and has long-term stability. Background technique [0002] The technology of water plugging and profile control is an effective method to improve the water injection effect and the ultimate oil recovery when the oilfield enters the stage of high water cut development. Domestic oilfield scientists have conducted in-depth research on this aspect (for example: CN200910015904.0 High-temperature and high-salinity oil Polymer microspheres for deep reservoir profile control and preparation method; CN200510080029.6 a high-temperature and high-salt gel water plugging method; CN200410051435.5 a water glass high-temperature plugging agent for oil recovery;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C09K8/58C08J3/24E21B43/22
Inventor 张洪君王浩龙华柳荣伟刘建山李瑞马昌明郝英敏孙倩茹李德胜赵剑飞王太玉
Owner PETROCHINA CO LTD
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