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Bridging leak-stopping agent for fractured reservoir, and preparation method and application thereof

A kind of lost circulation agent and lost circulation agent technology, applied in the field of drilling lost circulation agent, can solve the problems of narrowing, oil and gas production decline, etc., and achieve the effect of preventing the damage of reservoir stress sensitivity

Active Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During production operations, the pressure in the well decreases, and the fractures will be narrowed under the action of closure stress, resulting in a significant decline in oil and gas production

Method used

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  • Bridging leak-stopping agent for fractured reservoir, and preparation method and application thereof
  • Bridging leak-stopping agent for fractured reservoir, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Base slurry: bentonite 5; NaCO 3 : 0.25; water: 100 (parts by weight).

[0022] Stoppage agent of the present invention:

[0023] Based on the total weight of the plugging agent, the weight percentage of each component is:

[0024] Quartz sand 14-20 mesh: 24%;

[0025] Calcium carbonate 40-60 mesh: 25%;

[0026] Calcium carbonate 80-150 mesh: 25%;

[0027] Calcium carbonate 400-600 mesh: 15%;

[0028] Asphalt powder: 5%;

[0029] Acetate: 6%, length 1.8mm.

[0030] Mix the above components to get the mixed bridging plugging material, and test the plugging effect according to the conventional method. The plugging material can effectively plug artificial cracks with a width of 1mm, the pressure bearing capacity is greater than 15MPa, and the plugging agent is 15% The acid solubility rate under hydrochloric acid is 70.5%.

Embodiment 2

[0032] Base slurry: bentonite 5; NaCO 3 : 0.25; water: 100 (parts by weight).

[0033] Stoppage agent of the present invention:

[0034] Based on the total weight of the plugging agent, the weight percentage of each component is:

[0035] Quartz sand 6-8 mesh: 20%;

[0036] Calcium carbonate 16-30 mesh: 25%;

[0037] Calcium carbonate 60-120 mesh: 25%;

[0038] Calcium carbonate 400-600 mesh: 12%;

[0039] Asphalt powder: 8%;

[0040] Type II acetate: 10%, length 5mm.

[0041] Mix the above components to get the mixed bridging plugging material, and test the plugging effect according to the conventional method. The plugging material can effectively plug artificial cracks with a width of 3mm, the pressure bearing capacity is greater than 15MPa, and the plugging agent is 15% The acid solubility rate under hydrochloric acid is 71.5%.

Embodiment 3

[0043] Base slurry: bentonite 5; NaCO 3 : 0.25; water: 100 (parts by weight).

[0044] Stoppage agent of the present invention:

[0045] Based on the total weight of the plugging agent, the weight percentage of each component is:

[0046] Quartz sand 4-6 mesh: 18%;

[0047] Calcium carbonate 16-30 mesh: 25%;

[0048] Calcium carbonate 60-120 mesh: 25%;

[0049] Calcium carbonate 320-400 mesh: 13%;

[0050] Asphalt powder: 7%;

[0051] Tri-acetate: 12%, length 8mm.

[0052] Mix the above components to get a good bridging plugging material, and test the plugging effect according to the conventional method. The plugging material can effectively plug artificial cracks with a width of 5mm, the pressure bearing capacity is greater than 15MPa, and the plugging agent is 15% The acid solubility rate under hydrochloric acid is 74.5%.

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Abstract

The invention provides a bridging leak-stopping agent for a fractured reservoir, and a preparation method and application thereof. The leak-stopping agent comprises a bridging material, calcium carbonate particles, asphalt powder and acid-soluble fiber, wherein the bridging material is quartz sand and / or ceramsite, and the acid-soluble fiber is one or a mixture of two or more selected from a group consisting of polyester fiber, cellulose acetate fiber II, cellulose acetate fiber III and alkali-free glass fiber. On the basis of the total weight of the leak-stopping agent, the leak-stopping agent comprises, by weight, 15 to 30% of the bridging material, 50 to 70% of calcium carbonate particles, 5 to 15% of asphalt powder and 5 to 15% of acid-soluble fiber. The bridging leak-stopping agent can block cracks with width of 1 to 5 mm and has bearing capability of 15 MPa or above and acid solubility of 70% or above; and after plugging removal through acidification, acid-insoluble rigid particles can prevent stress-sensitive damage to reservoir strata and effectively protect oil and gas reservoirs.

Description

technical field [0001] The invention relates to the field of drilling plugging agents, and more specifically relates to a bridging plugging agent for fractured reservoirs and its preparation method and application. Background technique [0002] Lost circulation refers to the process of various working fluids (including drilling fluid, cement slurry, completion fluid and other liquids) under the action of pressure difference during various downhole operations such as drilling, cementing and completion, testing or workover. A downhole complication of flow into a formation. Lost circulation not only consumes drilling time and loses drilling fluid, but also may cause a series of downhole complex situations such as sticking, blowout, and collapse. In severe cases, the wellbore will be scrapped and cause huge economic losses. In addition, lost circulation in the reservoir section can also cause serious reservoir damage. [0003] For non-reservoir leakage, different permanent plu...

Claims

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Application Information

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IPC IPC(8): C09K8/514C09K8/516
CPCC09K8/514C09K8/516C09K2208/08C09K2208/18
Inventor 李大奇刘四海刘金华陈曾伟张凤英褚奇胡子乔
Owner CHINA PETROLEUM & CHEM CORP
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