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Formation opener agent for low permeable reservoir of oilfield

A low-permeability reservoir and dredging agent technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of small pore radius of oil layers, difficult injection, secondary pollution, etc., to reduce oil-water interfacial tension, improve Seepage ability, the effect of preventing emulsification clogging

Active Publication Date: 2009-02-11
DAQING PETROLEUM ADMINISTRATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Crude oil has many heavy components, strong adsorption, poor fluidity, weak water absorption capacity, medium speed sensitivity, medium strong water sensitivity, medium strong acid sensitivity, small pore radius of oil layer, significantly increased clay content and shale content, generally above 10%, Slight clogging of this type of oil layer during water injection development can cause injection pressure to rise, making injection difficult, resulting in widespread occurrence of under-injection wells, seriously affecting water injection development in oilfields
The conventional method is to adopt acidification, fracturing or acid fracturing. The cost of fracturing and acid fracturing is high. The acidification measures currently used mainly include nitric acid powder acidification, compound acid acidification, soil acid acidification, improved soil acid acidification, and hot gas acid acidification. Acidification measures are aimed at different blockages such as mechanical impurities, organic blockage, inorganic salt precipitation blockage, colloidal asphaltenes, etc., and there are disadvantages such as too fast acid rock reaction, small treatment radius, secondary pollution, and short validity period.
Clay plugging with a large plugging radius cannot be effectively removed, which affects the development effect of low permeability reservoirs

Method used

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  • Formation opener agent for low permeable reservoir of oilfield
  • Formation opener agent for low permeable reservoir of oilfield

Examples

Experimental program
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Effect test

Embodiment Construction

[0009] The present invention will be further described below by way of examples.

[0010] 1. In order to quantitatively evaluate the treatment effect of formation dredging agent, sandstone cores with the same lithology and high shale content in the same section of wells in the same block were selected, and core tests were carried out to measure the recovery of the core permeability. In view of the characteristics of low permeability wells with high clay mineral content, strong water sensitivity and poor water absorption capacity in thin poor layers, formation dredging agent, compound acid dissolution test and core flow evaluation test were carried out. According to the core test data, the formation dredging agent has an obvious transformation effect and can meet the water flooding development requirements of this block.

[0011] Core Acidizing Test Results Table 1

[0012]

[0013] The ratio of adsorption inhibitor in the above formula is: 0.5% ethylene dimethylene-dihexad...

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Abstract

The invention relates to a stratum opener agent which is applied to oilfield low permeability reservoir. The stratum opener agent comprises two parts: pre-disposal liquid and acid inhibitor system; according to the weight percentage, the pre-disposal liquid consists of solvent and surfactant as follows: 1-3% of organic solvent such as higher alcohol, 0.2-1% of non-ionized surfactant polyoxyethylene alkylolamide, 0.3-0.5% of tenthfive alkyl sulfonate, and the residual quantity of stratum water; according to the weight percentage, the acid inhibitor system comprises 5-10% of low-carbon organic acid, 1-3% of hydrofluoric acid, 0.5% of inhibitor thio-phosphate imidazoline polyoxyethylene ether, 1% of adsorption inhibitor and the residual quantity of water; the adsorption inhibitor comprises 0.5-2% of ethyl dimethylene-bi-cetyltrimethylammonium ammonium bromide, 0.2-1% of quaternary ammonium salt small kation, 2-5% of inorganic salt, 0.2% of 1,3-amine group propyl alcohol N-methyl sodium phosphate or potassium dihydrogen phosphate or sodium hexametaphosphate. The opener agent can effectively improve the seepage capability of reservoir and achieve the objects of decompression and augmented injection and improving the yielding.

Description

Technical field: [0001] The invention relates to a chemical preparation injected downhole in the field of oil production in oil fields, in particular to a formation dredging agent applied to low-permeability reservoirs in oil fields. Background technique: [0002] The physical characteristics of low-permeability reservoirs in oilfields: low permeability, less than 50md, small effective thickness, and serious plane heterogeneity. Crude oil has many heavy components, strong adsorption, poor fluidity, weak water absorption capacity, medium speed sensitivity, medium strong water sensitivity, medium strong acid sensitivity, small pore radius of oil layer, significantly increased clay content and shale content, generally above 10%, Slight clogging of this type of oil layer during water injection development can cause injection pressure to rise and injection is difficult, resulting in widespread occurrence of under-injection wells, which seriously affects oilfield water injection d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58C09K8/52
Inventor 张爱兰池世永郭富泰
Owner DAQING PETROLEUM ADMINISTRATION
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