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Acidification composition for oil well

A composition and technology for oil wells, applied in drilling compositions, wellbore/well components, chemical instruments and methods, etc., can solve the problems of low quartz dissolution rate, short acid solution action distance, shallow acidification depth, etc. Enlarge the radius of acidification, improve the effect of tapping potential and hard-to-recover reserves

Active Publication Date: 2006-03-29
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the acidification effect data is not involved in the prior art or there are problems such as high acid solution to clay dissolution rate and low quartz dissolution rate in the existing technology, so that the acid solution action distance is short and the acidification depth is shallow. , providing a new composition for acidizing oil wells

Method used

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  • Acidification composition for oil well

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Effect test

Embodiment 1

[0019]

Embodiment 2

[0023] The composition components for oil well acidification are made into weight concentration: 6% molecular weight is 500 hydrolyzed polymaleic anhydride+4.5% HF acidification composition for oil well, test according to the conditions and steps of Example 1 , the results are as follows: for quartz (SiO 2 ) The dissolution rate of rock samples is 32.75%, and the dissolution rate of clay is 7.79%.

Embodiment 3

[0025] The acidifying composition component that is used for oil well is made into the weight concentration and is: the acidifying composition of hydrolyzed polymaleic anhydride+×% HF that 6% molecular weight is 600, test according to the condition and step of embodiment 1, its result is as follows :

[0026]

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Abstract

An acidifying composition for oil well features that its main component is the hydrolyzed polymaleic anhydride. Its advantages are high acidifying effect, long action distance, low denudation to clay and high denudation to quartz.

Description

technical field [0001] The invention relates to an acidizing composition for oil wells, in particular to an acidizing composition for oil wells used in oil layer acidification in crude oil exploitation. Background technique [0002] Crude oil is generally buried in deep underground oil layers, most of which are composed of sedimentary rocks. Sedimentary rocks mainly exist in two forms, sandstone and limestone. The crude oil in the sandstone oil layer is mainly stored in the pores or crevices of the rock; the crude oil in the limestone oil layer is mainly stored in the cracks or caves of the rock. As far as the world is concerned, sandstone oil reservoirs are the main storage form of crude oil. In China, sandstone deposits are the main deposits. What people usually call oil reservoirs mainly refers to sandstone oil reservoirs. [0003] Sandstone consists of rock grains (mainly composed of sio 2 ), cement and pores. The pores of rocks are not ...

Claims

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Application Information

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IPC IPC(8): C09K8/72E21B43/28
Inventor 陈永福张卫东张惠明张磊
Owner CHINA PETROLEUM & CHEM CORP