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Active agent compound plugging removal process

A technology of active agent and surfactant, applied in the direction of drilling composition, production fluid, wellbore/well parts, etc., can solve the problems of short validity period and ineffective effect, achieve long validity period, remove inorganic pollution, increase The effect of relative permeability

Active Publication Date: 2012-02-01
DAQING HUILIAN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used plugging removal method is acidification plugging removal, but the effect is not obvious and the validity period is short

Method used

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  • Active agent compound plugging removal process
  • Active agent compound plugging removal process
  • Active agent compound plugging removal process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1. Simulating the actual formation temperature and pressure, passing the compound acid and the active agent successively through the natural core to carry out the plugging removal flow simulation test of the core, and judging the effect of plugging removal by the change of standard brine permeability before and after the injection of the compound plugging removal fluid.

[0037] η=(Kw-Kw 0 ) / Kw×100%

[0038] In the formula, η-permeability increase rate, %

[0039] k 0 - Annotate the initial hydraulic permeability of the core before liquid plugging, ×10 -3 μm 2 ;

[0040] Kw-the hydraulic permeability of the core after annotating liquid plugging, ×10 -3 μm 2 .

[0041] Core physical simulation experiment data Table 3

[0042]

[0043] The average increase rate of the core permeability is 100.81% after the natural core is de-plugged with HSA active agent.

Embodiment 2

[0044] Example 2. Field test of tertiary infill wells in the west block of South 6 District:

[0045] 1. Geological characteristics of test wells and analysis of reasons for poor water absorption conditions

[0046] According to the actual injection status of the test well, through the analysis of the reservoir minerals and fluid physical properties in the tertiary infill well area of ​​the west block of South 6 Block, combined with the logging results of the water absorption profile of the test well, the main reasons for the poor water absorption are as follows:

[0047] (1) The reservoir has poor homogeneity, uneven water absorption, serious conflicts between layers, and some layers do not absorb water;

[0048](2) The reservoir is a thin and dirty oil layer with poor fluidity, weak water absorption capacity, medium velocity sensitivity, medium strong water sensitivity, medium strong salt sensitivity, medium strong acid sensitivity, and medium strong alkali sensitivity. Conv...

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Abstract

The invention relates to an active agent composite blocking removal process. The process consists of two parts. Firstly, a high-pressure pump is used to inject compound acid at the wellhead of the water injection well. After an interval of 12 hours, an infusion device is used to inject the active agent. The compound acid consists of 10-12% hydrochloric acid, 1%-2% hydrofluoric acid, Fluoroboric acid 8%-10%, glacial acetic acid 2%, corrosion inhibitor 2.0%, citric acid 0.1-0.2%, isobutanol 4.0-6.0% and water 68-72%, active agent is anionic non-ionic surfactant 0.1-0.2%, sodium chloride 0.3-0.5% and the rest water, the above-mentioned corrosion inhibitor is compounded by hexamethylenetetramine and formaldehyde according to 1:1, and the anionic non-ionic surfactant is made of petroleum benzene Sodium sulfonate and fatty acid alkanolamide are compounded at a ratio of 1:1. The composite plugging remover has the effect of comprehensive plugging removal near the wellbore zone and the deep part of the oil layer, and has a long effective period and obvious plugging removal effect.

Description

Technical field: [0001] The invention relates to a plugging removal process for water injection wells in the field of oil production, in particular to an active agent composite plugging removal process. Background technique: [0002] In low-permeability oilfields, the reservoirs are poorly developed, the pore radius of the reservoirs becomes significantly smaller, the clay content and shale content increase significantly, and the median grain size decreases significantly. Slight clogging of this type of oil layer during water injection development can cause injection pressure to rise, making injection difficult. At the same time, the characteristics of small pores, enhanced pore-throat effect, and high specific surface directly have a significant impact on fluid flow, and the lower the permeability, the stronger the impact. As the injected water continues to advance, the seepage resistance increases rapidly, the injection pressure rises rapidly, and the water injection volu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/16C09K8/60
Inventor 吴永华吴震宇吴明伟吴琼钰
Owner DAQING HUILIAN TECH DEV
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