High-temperature-resistant and high-salt-resistant oil reservoir profile modifying water plugging agent and preparation method thereof

A profile control water shutoff agent, high temperature resistant technology, applied in the field of profile control water shutoff agent, oil reservoir profile control water shutoff agent, can solve the problem of restricting the application of particle plugging agent, damage to reservoir integrity, and particle plugging agent has not yet obtained the order Satisfactory effect and other issues, to achieve low-permeability reservoir damage, enhanced plugging effect, and stable bridge plugging effect

Active Publication Date: 2016-03-16
CHINA UNIV OF PETROLEUM (BEIJING) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, under the background that the high-temperature and high-salt reservoirs that are in the later stage of development are getting more and more attention, the above-mentioned granular plugging agents have not yet achieved satisfactory results in the actual application of such mines
In particular, most solid-phase particle plugging agents only act on the near-wellbore zone, and the plugging of the formation is rigid and non-selective, which is likely to cause damage to the integrity of the reservoir
At the same time, due to the defects in injectability and operability, the application of granular plugging agents is limited.

Method used

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  • High-temperature-resistant and high-salt-resistant oil reservoir profile modifying water plugging agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This example provides a high-temperature and high-salt oil reservoir profile control and water shutoff agent, which is prepared by the following steps:

[0039]Dissolve the raw materials of the inner layer coating, and after high-temperature fluidized bed treatment, coat the inner layer coating on the surface of the inner core raw material. After the thickness reaches 8 μm (about 10 minutes), after drying and sieving, the outer layer The raw materials of the coating are dissolved, and the surface of the inner coating is coated with the outer coating. After the thickness reaches 4 μm, the coating is stopped (about 6 minutes). After drying and sieving, a bridging plugging agent with double coating is obtained. particles;

[0040] Dissolve 2g of guar gum powder in 400mL tap water, stir for 0.3h, add 20g of plugging agent particles (the core of the particle is silicon oxide, the inner layer is covered with a heat-swellable cross-linked resin film formed by acrylic resin, an...

Embodiment 2

[0052] This embodiment provides a high-temperature and high-salt oil reservoir profile control and water shutoff agent, based on the total amount of the high-temperature and high-salt oil reservoir profile control and water shutoff agent as 100wt%, which includes Blocking agent particles (the inner core of the particle is silicon oxide, the inner film is a heat-swellable cross-linked resin film formed by acrylic resin, and the outer film is a rigid resin protective film formed by phenolic resin), 0.5wt% guar gum, 0.1 wt% sodium borate and the balance water. It is prepared according to the preparation method of Example 1.

[0053] BROOKFIELD rotary viscometer DV-II+ was used to measure the variation curve of the viscosity of the profile control and water shutoff agent for high-temperature and high-salt oil reservoirs of this embodiment as a function of temperature. The measurement results are shown in Table 1.

[0054] Table 1

[0055] temperature / ℃

Embodiment 3

[0057] This embodiment provides a high-temperature and high-salt oil reservoir profile control and water shutoff agent, based on the total amount of the high-temperature and high-salt oil reservoir profile control and water shutoff agent as 100wt%, which includes Blocking agent particles (the core of the particle is calcite, the inner layer is coated with a heat-swellable cross-linked resin film formed by alkyd resin, and the outer layer is coated with a rigid resin protective film formed by epoxy resin), 0.5wt% guar gum , 0.1wt% sodium borate and the rest of the water. It is prepared according to the preparation method of Example 1.

[0058] BROOKFIELD rotational viscometer DV-II+ was used to measure the variation curve of viscosity with temperature of the profile control and water shutoff agent for high-temperature and high-salt oil reservoirs in this example after standing for 30 hours. The measurement results are shown in Table 2.

[0059] Table 2

[0060] tempe...

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Abstract

The invention provides a high-temperature-resistant and high-salt-resistant oil reservoir profile modifying water plugging agent and a preparation method thereof. The high-temperature-resistant and high-salt-resistant oil reservoir profile modifying water plugging agent comprises a suspension and plugging agent particles, wherein the plugging agent particles take an inorganic silicon material as an inner core, a thermal-swelling crosslinked resin membrane as an inner layer covering membrane, and a rigid resin protective membrane as an outer layer covering membrane; the inner layer covering membrane covers the inner core, and the outer layer covering membrane covers the inner layer covering membrane; and the suspension comprises water, guanidine gum and sodium borate. The invention also provides the preparation method of the profile modifying water plugging agent, and the preparation method comprises the following steps: covering the inner layer covering membrane on the surface of an inner core raw material, and after a needed thickness is reached, covering the outer layer covering membrane on the surfaces of particles covered with the inner layer covering membrane to obtain plugging agent particles; dissolving the guanidine gum in water, then adding the plugging agent particles, and stirring; and adding the sodium borate to obtain the high-temperature-resistant and high-salt-resistant oil reservoir profile modifying water plugging agent. The high-temperature-resistant and high-salt-resistant oil reservoir profile modifying water plugging agent provided by the invention is good in plugging effect and causes small damages to a reservoir stratum.

Description

technical field [0001] The invention relates to a profile control water shutoff agent, in particular to a high temperature and high salt oil reservoir profile control water shutoff agent, which belongs to the technical field of oil reservoir exploitation. Background technique [0002] With the development of oilfields, after decades of water flooding, all major oilfields have entered the development stage of high water cut period or even super high water cut period. In order to continue in-depth exploration of follow-up resources and increase remaining recoverable reserves, unconventional reservoirs with low or ultra-low permeability, high temperature or ultra-high temperature have been paid more and more attention. Some oil fields with high temperature and high salinity reservoirs, such as some blocks in Tarim Oilfield, have produced a large number of high permeability strips after long-term water flooding, and the injected water rushes along the high permeability strips at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/516C09K8/512
CPCC09K8/5045C09K8/512C09K8/516
Inventor 侯吉瑞张伟民高建
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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