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Core pretreatment method for fractured reservoir damage evaluation

A pretreatment and core technology, which is applied in the fields of earthwork drilling, measuring equipment, suspension and porous material analysis, etc., can solve the problems of not considering the time effect of fractured cores, and achieve the effect of weakening the time effect and reducing the impact

Inactive Publication Date: 2014-03-19
CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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Problems solved by technology

Fractures are effective seepage channels for low-permeability and tight reservoirs. The current evaluation method for fracture core damage does not consider the time effect of fracture cores. Therefore, a core pretreatment method that weakens the time effect is formed, which is useful for evaluating low-permeability and tight reservoirs. damage is significant

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  • Core pretreatment method for fractured reservoir damage evaluation
  • Core pretreatment method for fractured reservoir damage evaluation
  • Core pretreatment method for fractured reservoir damage evaluation

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Embodiment Construction

[0025] A core pretreatment method for fractured reservoir damage evaluation, comprising the following steps in sequence:

[0026] (1) Fracturing the core and adding proppant to obtain a suitable fracture width;

[0027] (2) Test the fractured core to determine whether the core permeability is qualified, return to step (1) if unqualified, and enter subsequent step (3) if qualified;

[0028] (3) Put the fractured core with qualified permeability into a sealed container saturated with formation water or standard brine for vacuuming, so that the saturated formation water or standard brine completely invades into the fractured core, and put the fractured core into saturated formation water or standard brine. The time of vacuuming in the sealed container of brine is 48 hours;

[0029] (4) Put the fractured core after vacuuming into the core holder, and set the pressure and temperature;

[0030] (5) Replace the experimental fluid in the intermediate container with nitrogen or pump ...

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Abstract

The invention belongs to an experiment method of hydrocarbon reservoir protection in the exploration and development process of petroleum and gas, relating to a core pretreatment method for petroleum and gas reservoir fractured reservoir damage evaluation, in particular to a core pretreatment method for fractured reservoir damage evaluation. The method comprises six steps and provides a core pretreatment method for fractured reservoir damage evaluation, which can effectively weaken the time effect of a reservoir crack core, reduce influence on hydrocarbon reservoir damage evaluation by the time effect of the reservoir crack core, can accurately diagnose the hydrocarbon reservoir damage mechanism and preferably provide a basis for working solution optimization.

Description

technical field [0001] The invention belongs to an experimental method for oil and gas layer protection in the oil and gas exploration and development process, and relates to a core pretreatment method for damage evaluation of oil and natural gas reservoirs, in particular to a core pretreatment method for damage evaluation of fractured reservoirs. Background technique [0002] With the sharp decline in the production of conventional oil and gas resources and the increasing demand for oil and gas, low-permeability oil reservoirs and tight gas reservoirs (including tight sandstone gas reservoirs, tight carbonate rock gas reservoirs and shale gas reservoirs) urgently need to be developed on a large scale. However, tight gas reservoirs are characterized by inherently low porosity and low permeability, rich and diverse clay minerals, and developed fractures, making them vulnerable to damage and A characteristic that is difficult to remove after damage. The implementation of rese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00G01N15/08
Inventor 杨斌黎金明赵海锋张宇金祥哲愈浩杰周珊珊胡恒
Owner CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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