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Oil well acidification composition

A technology for oil well acidification and composition, which is applied in the field of oil well acidification composition, can solve the problems of low quartz dissolution rate, short acid solution action distance, shallow acidification depth, etc., achieves good technical effect, and improves 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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  • Abstract
  • Description
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  • Application Information

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 oil well acidizing composition

Method used

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  • Oil well acidification composition

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022]

Embodiment 2

[0026] The oil well acidizing composition composition is divided into weight concentration and is: 6% molecular weight is the oil well acidizing composition of the maleic anhydride-acrylic acid copolymer+4.5%HF of 450, carries out the test according to the condition and step of embodiment 1, and its result is as follows: For quartz (SiO 2 ) The dissolution rate of rock samples is 32.11%, and the dissolution rate of clay is 11.94%.

Embodiment 3

[0028] Organic phosphonic acid is made into weight concentration and is: 6% molecular weight is the acidification liquid of maleic anhydride-acrylic acid copolymer+×%HF of 700, tests by the condition and step of embodiment 1, and its result is as follows:

[0029]

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Abstract

An acidifying composition for oil well features that its main component is maleic anhydride-acrylic acid copolymer. 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 oil well acidizing composition, in particular to an oil well acidizing composition for 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 only containers ...

Claims

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Application Information

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IPC IPC(8): C09K8/72E21B43/27
Inventor 陈永福张卫东张磊张惠明
Owner CHINA PETROLEUM & CHEM CORP