Performance evaluation method for fracture acidizing temporary plugging agents

A technology of fracturing acidification and evaluation method, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc. It can solve the problems of shale gas fracturing design and construction problems, and achieve the effect of improving single well productivity

Inactive Publication Date: 2017-01-04
YANCHANG OIL FIELD
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AI Technical Summary

Problems solved by technology

The interference between artificial hydraulic fractures and natural fractures has brought troubles to the design and operation of shale gas fracturing

Method used

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Embodiment Construction

[0023] The present invention is described in detail below, and the content of the present invention is not limited to the scope of the following examples.

[0024] A method for evaluating the performance of a fracturing acidizing temporary plugging agent,

[0025] Including the following steps:

[0026] a. Sampling step, take a plurality of 300cm*300cm*300cm square cores as samples. The square cores are sealed with adhesive tape or resin. The sealing is convenient to protect the square cores and prevent the square cores from being exposed to the air for a long time to cause a large number of beddings. seam cracked.

[0027] b. In the step of drilling a wellbore, drill a wellbore in the center of the sample, with a diameter of 2-8 cm and a length of 15-20 cm; according to the physical properties of the sample, select a suitable diameter and length.

[0028] c. Wellbore intervention step: insert the wellbore along the wellbore and fix it. The wellbore is fixed in the wellbore ...

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Abstract

The invention relates to a performance evaluation method for fracture acidizing temporary plugging agents. The performance evaluation method comprises a step of sampling, specifically, a square core serves as a sample piece; a step of borehole drilling, specifically, a borehole is drilled in the center of the sample piece; a step of well barrel inserting-in, specifically, a well barrel is inserted in and fixed along the borehole, and an open hole section is reserved between the well barrel and the borehole; a step of evaluation parameter setting, specifically, evaluation parameters comprise temporary plugging agent kinds, triaxial pressure and displacement; a step of testing setting, at least three groups of triaxial pressure and displacement are set for each temporary plugging agent; and a step of fracture testing, specifically, fracture testing is conducted on each temporary plugging agent. The performance evaluation method has the beneficial effects that the performance evaluation method for the fracture acidizing temporary plugging agents is provided, the temporary plugging agents can be evaluated, the performance of the temporary plugging agents is known through the valuation parameters, the construction design of shale fracture is guided, a shale fracture gap net form can be controlled by selecting the suitable temporary plugging agents, and thus shale gas single well productivity is improved.

Description

technical field [0001] The invention relates to a fracturing acidification temporary plugging agent, in particular to a performance evaluation method of a fracturing acidification temporary plugging agent. Background technique [0002] Shale is a kind of sedimentary rock with extremely low permeability. It is generally considered as a natural barrier for oil and gas migration. In gas shale, natural gas is produced by itself. Shale is both a gas source rock and a reservoir. Shale gas is mainly natural gas that occurs in dark mud shale, silty mudstone formations and their interlayers in an adsorbed, free or dissolved state. [0003] In the late stage of oilfield exploitation, in order to increase oil production, some technical treatment should be taken on the oil layer, such as fracturing the oil-water layer, etc. In the selective fracturing technology, the high permeability formation needs to be blocked with a plugging agent in advance. In order to perform fracturing on low-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/27E21B33/13
Inventor 黄昌龙陈明剑
Owner YANCHANG OIL FIELD
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