Flow channel regulation agent for fractured-vuggy oil reservoir and preparation method thereof

A fracture-cavity type, adjusting agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of limited recovery, high pipeline requirements, and damaged pipe strings, and achieves low friction resistance, Good fluidity and size controllable effect

Inactive Publication Date: 2017-12-15
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increase water injection pressure, high requirements for pipelines, serious damage to the pipe string, high cost, easy water channeling, and limited degree of enhanced oil recovery

Method used

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  • Flow channel regulation agent for fractured-vuggy oil reservoir and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] According to another aspect of the present invention, the present invention also provides a preparation method of the above-mentioned fracture-cavity reservoir flow path regulator, comprising:

[0037] Slowly add the polymer into water according to the above ratio to obtain a carrier fluid;

[0038] Heating the high molecular polymer above the softening point, then adding calcium carbonate and bentonite to the high molecular polymer according to the above ratio, mixing evenly, adjusting the density, and granulating by conventional methods after cooling to obtain plugging regulating particles;

[0039] Mix the carrier fluid and plugging adjustment particles according to a predetermined ratio.

[0040] The fracture-cavity reservoir flow channel regulator of the present invention can be applied to failed water injection well groups, and can effectively realize the deep adjustment of the dominant water flow channels between well groups, expand the water injection sweep rang...

Embodiment 1

[0044] The composition of the carrier liquid in the flow channel regulator of the fractured-cavity reservoir of the present embodiment is: 2 parts of guar gum, 98 parts of water; the composition of the regulating plugging particles is: 97 parts of polyurethane, 3 parts of calcium carbonate, and 3 parts of bentonite; The composition of the flow channel regulator for fracture-cavity reservoirs is: 80 parts of carrier fluid and 20 parts of plugging regulating particles.

[0045] The preparation method is:

[0046] Add guar gum to water to obtain carrier fluid;

[0047] Heating the polyurethane to above the softening point, then adding calcium carbonate and bentonite to the polyurethane, mixing evenly, cooling and granulating to obtain plugging-adjusting granules;

[0048] The carrier fluid and the plugging regulating particles are mixed to prepare the fracture-cavity reservoir flow path regulating agent of this embodiment.

Embodiment 2-12

[0050] According to the method of embodiment 1, implement embodiment 2-12. The content of each component is shown in Table 1-Table 3.

[0051] Table 1 When the polymer is guar gum and the high molecular weight polymer is polyurethane

[0052]

Example 2

Example 3

Example 4

Guar Gum

0

1

3

water

100

99

97

Polyurethane

95

98

100

calcium carbonate

5

2

0

Bentonite

5

2

0

carrier fluid

10

30

100

Plugging particles

90

70

0

[0053] Table 2 When the polymer is polyacrylamide polymer and rubber particles

[0054]

Example 5

Example 6

Example 7

Example 8

polyacrylamide

2

0

1

3

water

98

100

99

97

rubber particles

97

95

98

100

calcium carbonate

3

5

2.5

0

Bentonite

3

5.5

2

0

carrier fluid

80

10

32

100

Plugging pa...

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Abstract

The invention relates to a flow channel regulation agent for a fractured-vuggy oil reservoir. The flow channel regulation agent is prepared from a carrying solution and plugging regulation particles, wherein the carrying solution is prepared from a polymer and water at the ratio of (0 to 3) : (97 to 100); the plugging regulation particles are of an viscoelastic particle mixture, and are prepared from a high molecular polymer, calcium carbonate and bentonite at the ratio of (95 to 100) : (0 to 5) : (0 to 5); the ratio of the carrying solution to the plugging regulation particles is (10 to 100) : (0 to 90). The flow channel regulation agent for the fractured-vuggy oil reservoir, provided by the invention, is suitable for high-temperature and high-mineralization-degree flow channels of a reservoir stratum, and can realize layer-by-layer plugging from a water injection well to a preferred water flow channel of an oil production well, and the layer-by-layer plugging is a key point for realizing the implementation of the flow channel regulation agent for the fractured-vuggy oil reservoir.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a flow channel regulator for fracture-cavity reservoirs and a preparation method thereof. Background technique [0002] In the middle stage of development of fractured reservoirs and fractured cave reservoirs in carbonate reservoirs, after multiple rounds of water injection between the well groups, a dominant water flow channel is formed, which makes it difficult to recover the remaining oil between wells, and the recovery rate Low. [0003] At present, there are two methods for exploiting the remaining oil between such wells: one is to increase the water injection pressure and start the secondary channel near the dominant water flow channel to improve the sweep efficiency; the other is to block the dominant water flow in sequence from the far end of the water injection well to the near well zone channel, gradually increase the water injection pressure, sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42
CPCC09K8/426C09K2208/10
Inventor 王雷何晓庆焦保雷任波钱真何龙巫光胜甄恩龙王瑞柏森王敏健
Owner CHINA PETROLEUM & CHEM CORP
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