Multi-hydrogen acid composition and application thereof

A technology of composition and polyhydric acid, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of eutrophic pollution, poor degradation performance, health and ecological environment threats, etc., and achieve the improvement of permeability, Strong dissolution capacity and the effect of improving permeability

Active Publication Date: 2014-04-02
PETROCHINA CO LTD
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Problems solved by technology

However, due to their poor degradation performance, these phosphorus compounds are likely to cause eutrophic pollution of water after long-term use, promote the growth of bacteria and algae, increase the difficulty of water treatment, and remain in the natural environment for a long time, posing a serious threat to human health and the ecological environment.

Method used

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  • Multi-hydrogen acid composition and application thereof

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Effect test

Embodiment

[0023] The present embodiment provides a kind of polyhydric acid composition, and it comprises following raw material composition by weight percent:

[0024] 6% polyoxalic anhydride, 4% ammonium fluoride, 0.5% quinoline chloride, 1% poly 2-hydroxy-1,3-propylene ammonium chloride, 5% polyoxyethylene alkyl alcohol ether, 1% Polyoxyethylene polyoxypropylene propylene glycol ether, 2% ethylene glycol butyl ether and 80.5% water.

[0025] The polyhydric acid composition is prepared by uniformly mixing and stirring the above-mentioned raw materials.

[0026] The polyhydric acid composition provided in this example was used in more than 30 injection well plugging removal operations in Liaohe Oilfield, with a success rate of 100%.

[0027] Well example: Well HN5-9 has an acidizing treatment radius of 4.5m, a reservoir thickness of 12.2m, and an average effective porosity of 12.5%.

[0028] The consumption of polyhydric acid composition is: R 2 h=3.14×0.125×4.52×12.2=96.97m 3 , t...

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Abstract

The invention provides a multi-hydrogen acid composition and application thereof. The multi-hydrogen acid composition consists of the following raw materials in percentage by weight: 6-8% of polyoxalic anhydride, 4-6% of villiaumite, 0.5-1% of high-temperature acidizing corrosion inhibitor, 1-2% of clay stabilizer, 5-10% of clean up additive, 1-2% of demulsifier, 2-5% of mutual solvent and the balance of water. The novel multi-hydrogen acid composition disclosed by the invention consists of polyoxalic anhydride, the villiaumite and the additive; the multi-hydrogen acid composition has strong dissolving capacity on quartz, clay and feldspar, and is capable of effectively improving permeability of a near-wellbore area reservoir and providing an important means for oil well production increase and water well injection increase; polyoxalic anhydride generates carbon dioxide and water after being degraded, so as to avoid environmental pollution.

Description

technical field [0001] The invention relates to a polyhydric acid composition and its application, and belongs to the technical field of petroleum exploitation. Background technique [0002] Almost all acid systems used in sandstone acidizing treatment contain HF or produce HF in the formation. Earth acid is the earliest and most common acid system used for sandstone reservoir acidification. However, due to the rapid reaction between HF and clay minerals, most of the acid solution is consumed near the wellbore, which eventually leads to the loss of acid solution in the reservoir. The penetration distance is short, and the effect of increasing production and injection is not ideal. At the same time, HF reacts with clay minerals, quartz, and feldspar in sandstone reservoirs to easily generate secondary precipitation and cause formation damage. In severe cases, the acidizing effect will be invalid. In response to this situation, in recent years, a polyhydric acid liquid syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528
CPCC09K8/528C09K2208/32
Inventor 李德胜王喜泉李文军王建刘畅李峰周广安徐爽周月慧王肖磊王宁辉徐青竹葛艳阳刘文英王燕
Owner PETROCHINA CO LTD
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