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Acidizing fluid for oil well

A technology for acidizing fluids and oil wells, applied in the field of acidizing fluids, which can solve the problems of short acidizing fluid action distance, low quartz dissolution rate, shallow acidizing depth, etc., and achieve the effect of improving potential and difficult-to-recover reserves and good technical effects

Active Publication Date: 2007-03-07
CHINA PETROLEUM & CHEM CORP +1
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  • Description
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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 acidizing fluid for oil wells

Method used

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  • Acidizing fluid for oil well
  • Acidizing fluid for oil well

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Experimental program
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Effect test

Embodiment 1

[0025] Polyisopropylene phosphonic acid was made into acidified solutions with weight percent concentrations of 7%, 10%, 15% and 20%, respectively. The temperature of the acidified reaction system was 80°C, and the reaction time was 4 hours. 2 The rock samples (at a depth of 2877 meters) were tested for dissolution rate, and the test results are as follows:

[0026]

Embodiment 2

[0030] Organic phosphonic acid is dubbed weight concentration and is: the acidizing fluid that is used for oil well of 6% polyisopropenyl phosphonic acid+4.5% HF, tests by the condition and step of embodiment 1, and its result is as follows: to quartz (SiO 2 ) The dissolution rate of rock samples is 26.42%, and the dissolution rate of clay is 6.73%.

Embodiment 3

[0032] Organic phosphonic acid is made into weight concentration and is: the acidification liquid of 6% polyisopropene phosphonic acid+×% HF, test by the condition and step of embodiment 1, its result is as follows:

[0033]

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Abstract

The present invention relates to oil well acidifying solution, and aims at solving the technological problems of short acidifying solution action distance and smaller acidifying depth caused by high corrosion rate of acidifying solution on clay and low corrosion rate on quartz, etc. The technological scheme of the present invention is that polyisopropenyl phosphonic acid is used as the main component of oil well acidifying solution. The present invention is used in oil extracting industry.

Description

technical field [0001] The invention relates to an acidizing fluid for oil wells, in particular to an acidizing fluid for oil wells used for acidizing oil layers 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. Worldwide, sandstone reservoirs are the main storage form of crude oil. In China, sandstone reservoirs are mainly used. People usually refer to oil reservoirs, which mainly refer to sandstone reservoirs. [0003] Sandstone consists of rock grains (mainly composed of sio 2 ), cement and pores. The pores of rocks are not only containers for oil storage, but also ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/12E21B43/28
Inventor 张卫东陈永福张惠明张磊乔建江
Owner CHINA PETROLEUM & CHEM CORP