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A Method for Judging the Critical Water Velocity of Formation Blockage

A critical water and flow rate technology, applied in earth-moving drilling, wellbore/well components, etc., to improve economic efficiency, avoid blockage, and reduce the degree of blockage

Active Publication Date: 2021-05-25
青海九零六工程勘察设计院有限责任公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • A Method for Judging the Critical Water Velocity of Formation Blockage
  • A Method for Judging the Critical Water Velocity of Formation Blockage
  • A Method for Judging the Critical Water Velocity of Formation Blockage

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Embodiment 1

[0020] Taking a certain medium and low temperature geothermal well as an example to describe the method of the present invention in detail, the density of the silt and sand particles in the geothermal well is 2650kg / m 3 , the density of water is 1000kg / m 3 , the sediment particle size composition and cumulative particle size composition data are shown in Table 1:

[0021] Table 1 The particle size composition and particle size cumulative composition data of a certain sediment

[0022]

[0023] A method for judging the critical water velocity of formation plugging, specifically comprising the following steps:

[0024] Step 1: Determine the coarse and fine grain content of mud and sand particles in the reservoir near the production well according to the sand control accuracy of the wellbore; determine the coarse and fine mud and sand particles in the reservoir near the injection well according to the peak of the mud and sand particle size distribution of the reservoir Among...

Embodiment 2

[0030] A detailed description of the method of the present invention is carried out by taking a certain medium and low temperature geothermal well as an example. The density of the silt and silt particles of the geothermal well is 2550kg / m 3 , the density of water is 1000kg / m 3 , the sediment particle size composition and cumulative particle size composition data are shown in Table 2:

[0031] Table 2 The particle size composition and particle size cumulative composition data of sediment

[0032]

[0033] A method for judging the critical water velocity of formation plugging, specifically comprising the following steps:

[0034] Step 1: Determine the coarse and fine grain content of mud and sand particles in the reservoir near the production well according to the sand control accuracy of the wellbore; determine the coarse and fine mud and sand particles in the reservoir near the injection well according to the peak of the mud and sand particle size distribution of the rese...

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Abstract

The invention relates to the technical field of geothermal well recharge technology and water injection development of oil and gas fields, in particular to a method for judging the critical water velocity of stratum blockage. In this method, the silt in the reservoir is divided into immovable silt coarse sand that acts as a supporting framework and movable silt sand fine sand that migrates in the pore throats of the coarse sand. The kinetic equation determines the critical flow velocity at which mud and sand start but does not clog and the flow velocity range at which mud and sand start may cause clogging, and based on this, the risk of clogging in the water injection formation can be judged. It can timely judge the risk of stratum clogging caused by water injection, determine the critical flow rate of stratum migration without clogging and the range of possible clogging, reduce the degree of clogging during formation water injection and even avoid clogging; the invention helps to improve geothermal water recharge capacity, Reduce costs, improve economic benefits, wide range of applications, and flexible use.

Description

technical field [0001] The invention relates to the technical field of geothermal well recharge technology and water injection development of oil and gas fields, in particular to a method for judging the critical water velocity of stratum blockage. Background technique [0002] Formation plugging is mainly divided into physical plugging, chemical plugging, gas plugging and microbial plugging. Studies have shown that physical blockage is the most common blockage, and it is mostly a manifestation of other types of blockage. Physical blockage is divided into particle migration, suspended matter blockage and clay mineral expansion. Among them, particle migration refers to the phenomenon that the poorly cemented particles in the reservoir fall off and migrate under the influence of the flow rate of the injected fluid, and accumulate in the pore roar, resulting in a decrease in permeability (velocity sensitivity). Influenced by physical properties; while suspended matter cloggin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 赵振张亮秦光雄罗银飞王万平陈惠娟晁嘉豪
Owner 青海九零六工程勘察设计院有限责任公司