Method for evaluating influence of drilling and completion fluid on oil and water permeability of rock core

A technology of oil-water penetration and evaluation method, applied in the direction of permeability/surface area analysis, suspension and porous material analysis, measuring device, etc., to achieve accurate results

Active Publication Date: 2016-06-08
DILLING FLUID TECH SERVICE CENT OF SINOPEC SHENGLI PETROLEUM ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, there are no other relevant reports that use the relative permeability test method to

Method used

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  • Method for evaluating influence of drilling and completion fluid on oil and water permeability of rock core
  • Method for evaluating influence of drilling and completion fluid on oil and water permeability of rock core

Examples

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Comparison scheme
Effect test

example 1

[0029] Evaluation of experimental slurry (formula: 6% sodium bentonite slurry + 0.2% sodium hydroxide + 0.2% polyacrylamide PAM + 1.0% LV-CMC + 3% SMP-2 + 3% polymer alcohol + 1.5% anti-high temperature dehydration agent HX-KYG + 2% nanoemulsion + 2% oil-soluble resin) reservoir protection effect, the experimental core selects the artificial sandstone core with gas phase permeability of 1385.20 mD, the porosity is 27.32%, and the size is: length 6.21cm, 2.53cm in diameter.

[0030] (1) Preparation of core and experimental fluid:

[0031]Dry the core to be tested and weigh the dry weight. The experimental temperature is 25°C. The total salinity of the simulated formation water is 1000mg / L, and the viscosity at 25°C is Simulated oil is prepared from crude oil and kerosene, with a density of 0.84g / cm 3 , the viscosity at 25°C is The oil-water viscosity ratio is 3.5:1; the core is vacuumed and saturated with simulated formation water, weighed wet, and the effective pore volum...

example 2

[0039] Evaluation of experimental slurry (formula: 5% sodium bentonite slurry + 0.3% IND30 + 3% SMP-2 + 3% nanoemulsion + 0.5% amino polyalcohol + 0.4% aluminum-based polymer + 2% hydrophobically modified starch HNC-1 +1.5% nano-calcium carbonate) for reservoir protection effect, the experimental core was selected from Shengli Qingdong 8 Well Sha3 Member core, taken from a depth of 1212.10-1214.15 meters, with a porosity of 26.15%, a gas phase permeability of 399.78 mD, and a size of It is: length 6.23cm, diameter 2.53cm.

[0040] (1) Preparation of core and experimental fluid:

[0041] The core to be tested was dried and weighed dry, and the experimental temperature was selected according to the geological conditions of the Qingdong 8 well reservoir, and the experimental fluid-simulated formation water and simulated oil were prepared; among them, the experimental temperature was selected at 46°C, and the total salinity of the simulated formation water was It is 4755mg / L, the...

example 3

[0049] Evaluation of on-site slurry (formula: 5-8% sodium bentonite slurry + 0.2% - 0.3% sodium hydroxide + 0.3% - 0.5% natural polymer coating inhibitor IND30 + 1.0% - 1.5% anti-high temperature fluid loss reducer HX- KYG+2%~3% Polymer alcohol+1%~2% natural polymer fluid loss reducer NAT20+3%~5% ideal filler+2%~3% waterproof locking agent YFS-3) Reservoir protection effect , The experimental core was selected from Shengli Chengbei 326 Well Dongying Formation core, taken from a depth of 3489.00 to 3502.00 meters, with a porosity of 17.87%, a gas phase permeability of 93.90 mD, and a size of 6.26 cm in length and 2.53 cm in diameter.

[0050] (1) Preparation of core and experimental fluid:

[0051] The core to be tested was dried and weighed dry, and the experimental temperature was selected according to the geological conditions of Chengbei 326 well reservoir, and the experimental fluid-simulated formation water and simulated oil were prepared; among them, the experimental tem...

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Abstract

The invention discloses a method for evaluating influence of a drilling and completion fluid on the oil and water permeability of a rock core. The method includes the steps: (1) preparing a rock core and a experimental fluid; (2) establishing irreducible water saturation and determining the oil phase permeability under an irreducible water state; (3) determining the original oil and water permeability of the rock core; and (4) determining the oil and water permeability after the drilling and completion fluid pollution; according to a value change of the oil and water relative permeability of the drilling and completion fluid before and after pollution, determining the influence of the drilling and completion fluid on the rock core. Good or bad reservoir protection effect of the drilling and completion fluid system can be evaluated; according to the method, a fluid flowing situation with the coexistence of an oil phase and a water phase in a reservoir can be fully simulated, and change laws of respective seepage abilities of the two phase fluids are obtained; compared with a traditional single-phase rock core flowing experiment, the result is more accurate, and has more guiding significance on drilling operation. The method is mainly used for evaluation of rock cores with the gas phase permeability of greater than 50 millidarcies.

Description

technical field [0001] The invention relates to the technical field of reservoir protection evaluation during petroleum drilling, in particular to a method for evaluating the influence of drilling and completion fluids on the oil-water permeability of rock cores. Background technique [0002] Reservoir protection is a systematic project that runs through the whole process of exploration and development of oil and gas wells. The internal cause of formation damage lies in the properties of the reservoir itself, such as lithology, physical properties and formation water characteristics, while the external cause of formation damage lies in the influence of foreign fluids entering the reservoir. Among them, the invasion damage of drilling fluid and completion fluid is the first ring of oil layer damage, which has been in contact with and interacting with the formation during the entire drilling and completion process. When the positive pressure difference opens the reservoir, th...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 徐运波蓝强武学芹李斌于雷王忠杰刘保双朱晓明
Owner DILLING FLUID TECH SERVICE CENT OF SINOPEC SHENGLI PETROLEUM ENG CO LTD
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