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Preparation method and fracturing construction method of locally and continuously mixed clean fracturing fluid additive

A technology for cleaning fracturing fluid and additives, applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve the problems of increased processing difficulty, high cost, incompleteness, etc., and achieve preparation and fracturing construction The method is simple, good sand-carrying performance, and the effect of a wide range of applications

Active Publication Date: 2011-04-27
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) The raw materials of clean fracturing fluid main agent are not easy to obtain and the cost is high;
[0009] (2) When cleaning the fracturing fluid on site, in order to improve the performance, additional inorganic salts such as KCl need to be added. Time-consuming
In addition, in order to ensure a smooth construction, it is generally necessary to prepare 15-20% of the remaining fracturing fluid. After the construction is completed, a part of the fracturing fluid is often left, which is difficult to recover and also increases the difficulty of subsequent treatment, which not only increases the cost, but also There is a certain degree of pollution to water resources and the environment;
[0010] (3) The environment temperature required for the preparation and construction of clean fracturing fluid is relatively high. Generally, the temperature of clean fracturing fluid requires water for preparation to be above 15°C. Ensure the viscosity and sand-carrying capacity of clean fracturing fluid, which makes the construction of clean fracturing fluid more difficult in winter in the north;
[0011] (4) During the fracturing operation, the clean fracturing fluid depends on formation crude oil or formation water to dilute and break the gel. For oil layers with reservoir temperature between 20-80℃ Or low-yield oil wells, natural gas layers, coal seams (gas), (oil, gas) shale all have the problem that the gel cannot be broken or the gel is not broken completely, which leads to the problem that it cannot be applied

Method used

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  • Preparation method and fracturing construction method of locally and continuously mixed clean fracturing fluid additive
  • Preparation method and fracturing construction method of locally and continuously mixed clean fracturing fluid additive
  • Preparation method and fracturing construction method of locally and continuously mixed clean fracturing fluid additive

Examples

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Effect test

Embodiment 1

[0052] 1. A method for continuously mixing clean fracturing fluid additives in situ, comprising the steps of:

[0053] 1) Weigh the raw materials according to the mass percentage of the following on-site continuous mixing clean fracturing fluid additive formula: take 300kg of octadecyltrimethylammonium chloride with an effective content of 70±2%, and 200kg with an effective content of 70 ±2% octadecyl dihydroxyethyl methyl ammonium nitrate, 150kg of o-hydroxybenzoic acid with effective content ≥99.0%, 80kg of tetramethylammonium chloride with effective content ≥99.0%, 20kg of Polypropylene glycol, its molecular weight 1000, 100kg of isopropanol with an effective content ≥ 99.0%, 150kg of clear water; the above-mentioned components are all industrial grade.

[0054] 2) Preheat the above-mentioned 300kg octadecyltrimethylammonium chloride and 200kg octadecyldihydroxyethylmethylammonium nitrate in a drying room at 60-80°C for 8-10 hours, and wait for 18 Alkyl trimethyl ammonium...

Embodiment 2

[0058] Embodiment 2: the preparation method of on-site continuous mixing clean fracturing fluid additive, it comprises the steps:

[0059] 1) Weigh the raw materials according to the mass percentage of the clean fracturing fluid additive formula for continuous mixing on site as follows: take 200kg of long-chain alkyl trimethyl quaternary ammonium salt, 100 kg of long-chain alkyl dihydroxyethyl methyl quaternary ammonium Salt, 50kg salicylic acid, 50kg tetramethylammonium chloride, 20kg polyalcohol, 100kg small molecule alcohol, 480kg clear water; Described long-chain alkyl trimethyl quaternary ammonium salt is hexadecyl trimethyl chloride Ammonium; the long-chain alkyl dihydroxyethyl methyl quaternary ammonium salt is hexadecyl dihydroxy ethyl methyl ammonium chloride; the salicylic acid is o-hydroxybenzoic acid; the polymer alcohol Be polyethylene glycol; Described small molecule alcohol is methyl alcohol;

[0060] 2) Preheat the above-mentioned 200kg long-chain alkyl trimet...

Embodiment 3

[0064] The preparation method of Example 3 is basically the same as that of Example 2, except that the formulation of the cleaning fracturing fluid additive is different in continuous mixing on site.

[0065] The on-site continuous mixing cleaning fracturing fluid additive formula of the present embodiment is: get 250kg long-chain alkyl trimethyl quaternary ammonium salt, 150kg long-chain alkyl dihydroxyethyl methyl quaternary ammonium salt, 100kg salicylic acid, 70kg tetramethylammonium chloride, 50kg polymeric alcohol, 200kg small molecule alcohol, 180kg clear water; Described long-chain alkyltrimethylammonium salt is cetyltrimethylammonium bromide; Described long-chain The alkyl dihydroxyethyl methyl quaternary ammonium salt is cetyl dihydroxy ethyl methyl ammonium bromide; the salicylic acid is o-hydroxybenzoic acid; the polymer alcohol is a kind of polypropylene glycol ; The small molecule alcohol is ethanol.

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Abstract

The invention discloses a preparation method and a fracturing construction method of a locally and continuously mixed clean fracturing fluid additive. The invention is characterized in that the preparation of the locally and continuously mixed clean fracturing fluid additive comprises four steps, and the purposes of local and continuous mixing and continuous construction of the prepared clean fracturing fluid additive can be realized without preparation in a fluid preparation station or a well filed in advance. Thus, both the preparation method and the fracturing construction method of the locally and continuously mixed clean fracturing fluid additive are very simple and convenient.

Description

technical field [0001] The invention relates to a fracturing fluid used in an oil and gas field and a fracturing construction method, in particular to a preparation method for continuously mixing clean fracturing fluid additives on site and a fracturing construction method. Background technique [0002] Viscoelastic surfactant fracturing fluids (also known as clean fracturing fluids) are widely used. [0003] Chinese patent 200310116815.8 introduces a method for preparing clean fracturing fluid by mixing unsaturated fatty acid salt with 18 carbon atoms and brine or mixing fatty acid with 18 carbon atoms, inorganic base and brine. The clean fracturing fluid is an anionic surfactant fracturing fluid system, which is composed of more than two kinds of additives. The inorganic salts such as KCl account for more than 4.0% in the clean fracturing fluid, and the addition of inorganic bases such as KOH is more than 2.0%. Rely on formation crude oil to break the gel. The content of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68E21B43/267
Inventor 王香增高瑞民吴金桥雷晓岚张军涛段玉秀高志亮
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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