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A Method for Evaluation of Reservoir Protection Effect of Temporary Plugging Agent

A technology for reservoir protection and evaluation methods, applied in measuring devices, instruments, suspensions and porous material analysis, etc., can solve the problems of mud cake wettability and oil-water permeability not reflected, and temporary plugging effect not investigated

Active Publication Date: 2017-01-04
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method will cause the following two deficiencies: on the one hand, the nature and function of the mud cake formed by the original drilling fluid are not fully considered, and only the oil phase permeability of the initial clean core is used for comparison. The temporary plugging effect of the mud cake formed by the drilling fluid system; and the wettability and oil-water permeability of the mud cake itself have not been reflected
At present, there are no other relevant reports on evaluating the reservoir protection effect of temporary plugging agents

Method used

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  • A Method for Evaluation of Reservoir Protection Effect of Temporary Plugging Agent

Examples

Experimental program
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Effect test

example 1

[0035] Evaluation of a composite temporary plugging agent a (obtained by compounding a cellulose modified product with 500, 800, and 1000 mesh calcium carbonate at a weight ratio of 5:2:1:1) added to 5% base slurry in low-permeability storage Reservoir protection in layers (25°C). The composite temporary plugging agent a was developed by Shengli Petroleum Engineering Co., Ltd. Drilling Technology Research Institute.

[0036](1) Select four cores with a gas phase permeability of 57.18-60.75 mD, a porosity of 8.8-9.5%, a core length of 6.03-6.16 cm, and a diameter of 2.50-2.53 cm for the experiment, which are respectively recorded as Core1 and Core2 , Core3, Core4; Saturate the core with clean brine, and use a vacuum pump to fully saturate the core for more than 24 hours.

[0037] (2) Put the core Core1 into the core holder of the JHMD-Ⅱ high temperature and high pressure core dynamic damage evaluation system produced by Jingzhou Modern Petroleum Technology Development Co., Ltd...

example 2

[0041] Evaluation of a composite temporary plugging agent b (obtained by compounding a chitosan modified product with a hydrophobic association polymer and 500, 1000 mesh calcium carbonate at a weight ratio of 4:2:1:2) added to seawater for polymerization Reservoir protection in medium-permeability reservoirs in drilling fluids (140°C). The composite temporary plugging agent b was developed by Shengli Petroleum Engineering Co., Ltd. Drilling Technology Research Institute.

[0042] (1) Select four cores with a gas phase permeability of 213.98-222.74 mD, a porosity of 11.5-14.3%, a core length of 6.01-6.11 cm, and a diameter of 2.51-2.54 cm for the experiment, which are respectively recorded as Core1 and Core2 , Core3, Core4; Saturate the core with clean brine, and use a vacuum pump to fully saturate the core for more than 24 hours.

[0043] (2) Put the core Core1 into the core holder of the JHMD-Ⅱ high temperature and high pressure core dynamic damage evaluation system, and us...

example 3

[0047] Evaluation of two composite temporary plugging agents, namely: c is a compound product of amphiphilic starch and surface-activated nano-calcium carbonate at a weight ratio of 1:1, d is an amphiphilic starch and 200, 500 mesh calcium carbonate and oil-soluble resin compounded at a weight ratio of 6:1:2:3, the two are added to seawater polymer drilling fluid for reservoir protection in high-permeability reservoirs (90°C). The two composite temporary plugging agents were developed by Shengli Petroleum Engineering Co., Ltd. Drilling Technology Research Institute.

[0048] (1) Select eight cores with a gas phase permeability of 521.50-529.06 mD, a porosity of 15.5-17.3%, a core length of 6.07-6.13 cm, and a diameter of 2.51-2.56 cm for the experiment, which are respectively recorded as Core1 and Core2 , Core3, Core4, Core5, Core6, Core7, Core8; saturate the core with clean brine, and use a vacuum pump to fully saturate the core for more than 24 hours.

[0049] (2) Put the c...

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Abstract

The invention discloses a temporary plugging agent reservoir protection effect evaluating method. The method comprises the following steps: 1, preparing a rock core; 2, determining the original permeability of the rock core; 3, determining the oil water seepage amount after protoplasm pollution; and 4, determining the oil water phase permeability and the oil water seepage amount after temporary plugging, determining the contribution condition of a temporary plugging agent to the oil water permeating ability of a whole drilling fluid system and the properties of a mud cake according to an oil water seepage amount ratio before and after the temporary plugging, judging that the temporary plugging agent contributes to the whole oil phase permeation ability when Rd is greater than R, determining the temporary plugging agent flow back ability according to a time from water dispelling ending of oil to oil phase seepage rate stability, that is a seepage balance time, and judging the temporary plugging agent flow back ability is good when t1 is smaller than t. The method can be used to investigate the contribution condition of the temporary plugging agent to the whole drilling fluid system, can fully realize the properties and the effects of the mud cake formed by the drilling fluid, and is an accurate and comprehensive evaluating method.

Description

technical field [0001] The invention relates to the technical field of temporary plugging in the oil drilling process, in particular to a method for evaluating the protective effect of a temporary plugging agent reservoir. Background technique [0002] Since Luo Pingya et al. proposed shielding temporary plugging technology to protect reservoirs in 1997, temporary plugging agents, as the most important reservoir protection materials, have developed rapidly and become more and more widely used in reservoir protection during drilling and completion. application. The temporary plugging technology mainly relies on various temporary plugging agents to form a shielding ring near the wellbore, which effectively prevents the solid phase and filtrate in the drilling fluid from invading the reservoir during the drilling process, avoiding the damage of the solid phase and liquid phase; after the oil well is completed, it can pass Perforating, acid-dissolving, oil-dissolving and other ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00G01N15/08
Inventor 徐运波李公让蓝强郑成胜张鹏李海滨张敬辉
Owner CHINA PETROCHEMICAL CORP
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