Testing method of plugging rate of repeated fracturing plugging agent

A technology for repeated fracturing and testing methods, which is applied in the fields of measuring devices, permeability/surface area analysis, suspension and porous material analysis, etc., and can solve problems such as improper selection of materials, decline in fluid production index, and low water absorption capacity of water injection wells. To achieve the effect of accurate test results and simple test process

Inactive Publication Date: 2013-04-17
陈兴佳
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Problems solved by technology

[0003] (1) The natural production capacity of the oil well is low, and it has industrial exploitation value only after fracturing;
[0004] (2) The law of seepage does not follow Darcy's law and has a starting pressure gradient;
[0005] (3) The natural energy is small, the pressure and output drop rapidly, and the primary recovery rate is low;
[0006] (4) The water absorption capacity of the water injection well is low, and the starting pressure and water injection pressure rise rapidly;
[0007] (5) The liquid production index of the oil well drops sharply after water breakthrough, making it very difficult to stabilize production
[0010] Oil, gas, and water wells after hydraulic fracturing, due t

Method used

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  • Testing method of plugging rate of repeated fracturing plugging agent

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[0035] Examples:

[0036] The method for testing the plugging rate of the repeated fracturing plugging agent according to the present invention has the following specific steps:

[0037] (a) Prepare repeated fracturing plugging agents for use;

[0038] (b) Split the selected core to create an artificial crack;

[0039] (c) Spread a layer of particulate matter on the fracture surface to simulate fracturing fractures;

[0040] (d) Inject the repeated fracturing plugging agent into the simulated fracturing fracture and let it stand for a period of time;

[0041] (e) Inject liquid, measure permeability, and calculate plugging rate.

[0042] In the step (b), the core is split axially.

[0043] In the step (c), the particulate matter is quartz sand.

[0044] In the step (d), the standing time is 12h.

[0045] In the step (e), the liquid is clear water.

[0046] The results measured by the above method are shown in the following table:

[0047]

[0048] It can be seen from the above table that when t...

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Abstract

The invention discloses a testing method of a plugging rate of a repeated fracturing plugging agent. The testing method comprises the following steps: (a) preparing the repeated fracturing plugging agent for future use; (b) cutting a selected rock core and making an artificial crack; (c) paving one layer of particle substances on a crack surface and simulating a fracturing crack; (d) injecting the repeated fracturing plugging agent into the simulated fracturing crack and standing for a period of time; and (e) injecting liquid, determining the permeation rate and calculating the plugging rate. According to the testing method disclosed by the invention, the plugging rate of the repeated fracturing plugging agent can be rapidly detected; and the testing process is simple, the tested result is accurate, and the testing method provides data support to the utilization of the repeated fracturing plugging agent.

Description

technical field [0001] The invention relates to a method for testing the plugging rate of a refracturing plugging agent. Background technique [0002] Due to poor reservoir physical properties, low oil well production, and complex pore structure and abnormal seepage state, the development characteristics of low-permeability reservoirs are very different from those of medium-high permeability reservoirs, and even qualitatively change. The development of low-permeability oilfields has the following basic features: [0003] (1) The natural production capacity of the oil well is low, and it has industrial exploitation value only after fracturing; [0004] (2) The law of seepage does not follow Darcy's law and has a starting pressure gradient; [0005] (3) The natural energy is small, the pressure and output drop rapidly, and the primary recovery rate is low; [0006] (4) The water absorption capacity of the water injection well is low, and the starting pressure and water inje...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 陈兴佳
Owner 陈兴佳
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