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Phenolic aldehyde weak gel control and flooding agent for rapid gelling of low temperature oil reservoirs

A weak gel, low-temperature oil technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of unsuitable for large-dose deep-level flood control, complex preparation process of cross-linking agent, and difficult to control gel formation time. , to achieve the effect of promoting low-temperature gel forming rate, convenient configuration and good gel-forming performance

Active Publication Date: 2015-09-02
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the current cost of polyethyleneimine is relatively high, and the cost per ton is higher than 100,000 yuan. It is not suitable for large-dose deep control and flooding, and can only be used for oil well water plugging and low-dose use. Therefore, the shortcomings are also obvious.
[0012] In the various low-temperature weak gel systems mentioned above, there are common problems such as difficult control of gelation time at low temperature, poor thermal salt stability, harsh gelation conditions, complex preparation process of crosslinking agent, and high cost.

Method used

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  • Phenolic aldehyde weak gel control and flooding agent for rapid gelling of low temperature oil reservoirs
  • Phenolic aldehyde weak gel control and flooding agent for rapid gelling of low temperature oil reservoirs
  • Phenolic aldehyde weak gel control and flooding agent for rapid gelling of low temperature oil reservoirs

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Embodiment 1

[0039] The composition of the phenolic weak gel modifier is as follows: comb-shaped salt-resistant polymer KYPAM (molecular weight: 1600×10 4 g / mol, initial viscosity 190.1mPa s, produced by Beijing Hengju Chemical Group) concentration is 0.2%, formaldehyde+hexamethylenetetramine concentration is 0.1%, hydroquinone+resorcinol concentration is 0.02%, The ammonium hydroxide concentration ranges from 0.1 to 0.3%, and the rest is clear water. See Table 2 for gel formation.

[0040] The gelling situation of the regulating and displacing agent prepared in the embodiment 1 of table 2

[0041]

[0042] The gelation time is 5-16 hours, the final gel strength is grade G, and no syneresis occurs in 90 days.

Embodiment 2

[0044] The composition of the phenolic weak gel modifier is as follows: HPAM (molecular weight: 1600×10 4 g / mol, initial viscosity 196.0mPa s) concentration is 0.2%, formaldehyde + phenolic concentration is 0.5%, resorcinol concentration is 0.02%, ammonium acetate concentration ranges from 0.1 to 0.3%, ammonium bicarbonate concentration range 0% to 0.2%, and the rest is clear water. See Table 3 for gel formation.

[0045] The gelling situation of the regulating and displacing agent prepared in the embodiment 2 of table 3

[0046]

[0047] The gelation time is 5-10 hours, the final gel strength is G, and no syneresis occurs in 90 days.

Embodiment 3

[0049] The composition of the phenolic weak gel modifier is as follows: HPAM (molecular weight: 1600×10 4 g / mol, initial viscosity 196.0mPa s) concentration is 0.2%, formaldehyde concentration is 0.2%, hydroquinone+catechol+resorcinol concentration is 0.02%, ammonium chloride concentration range is 0.1~ 0.3%, the ammonium bicarbonate concentration ranges from 0.1 to 0.2%, and the rest is clear water. See Table 4 for gelling conditions.

[0050] The gelling situation of the regulating and displacing agent prepared in the embodiment 3 of table 4

[0051]

[0052] The gelation time is 5-10 hours, the final gel strength is G, and no syneresis occurs in 90 days.

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Abstract

The invention discloses a phenolic aldehyde weak gel control and flooding agent for rapid gelling of low temperature oil reservoirs. The control and flooding agent consists of the following components in percentage by mass: 0.05-0.5% of a main component, 0.04-1% of a coagulation accelerator, 0.05-0.5% of a cross-linking agent, 0.01-0.05% of polyphenol and the balance of clear water or salt water. The main component is polyacrylamide HPAM or an acrylamide copolymer; and the acrylamide copolymer is comb salt-resistant polymer KYPAM, acrylic-2-acrylamide-2-methyl propane sulfonic acid copolymer AM / AMPS or acrylic-acrylamide-2-acrylamide-2-methyl propane sulfonic acid copolymer AM / AA / AMPS. According to the control and flooding agent disclosed by the invention, gelling time at normal temperature can be controlled within 5-24h, final gelling strength is high and heat salt stability is good; and the weak gel system is convenient in field preparation, strong in operability and is widely applicable to the control and flooding operation of various low temperature oil reservoirs.

Description

technical field [0001] The invention relates to a phenolic weak gel used for low-temperature oil reservoir control and displacement and for increasing water injection pressure, and belongs to the field of oil field chemistry in the tertiary oil recovery technology. Background technique [0002] Low-temperature reservoir control and flooding put forward higher requirements on the performance of weak gels. On the one hand, the weak gels need to be gelled at a suitable time at low temperatures. In addition, the gels must have excellent thermal-salt stability, easy on-site configuration, and low operating costs. . The low-temperature weak gels used in the related background technology mainly include the following types: [0003] (1) Multivalent metal ion cross-linking system [0004] The metal ion crosslinking agent used in this type of gel system is generally Al 3+ 、Cr 3+ , mainly suitable for medium and low temperature reservoirs (<70°C). al 3+ The most widely used cr...

Claims

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Application Information

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IPC IPC(8): C09K8/58C09K8/588
CPCC09K8/58C09K8/588
Inventor 贾虎蒲万芬任强
Owner SOUTHWEST PETROLEUM UNIV
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