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Oil pipe protection fluid with temporary plugging function, preparation method and application thereof

A technology for protecting fluids and oil pipes, which is applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve the problems of carbon dioxide huff and puff effect, increased operating costs, increased operating costs, etc., and achieves controllable degradation time. , Good temporary blocking function, fast blocking effect

Active Publication Date: 2017-03-22
SONGYUAN MARINE PETROLEUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the light oil pipe injection method needs to be pumped for production after the well is blown out, and the pump alone will affect the effect of carbon dioxide huffing and puffing, and the operating cost will increase; oil well antifreeze with a large amount of leakage is not easy to inject into the oil pipe from the oil casing annulus. Difficult to operate and increased operating costs

Method used

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  • Oil pipe protection fluid with temporary plugging function, preparation method and application thereof
  • Oil pipe protection fluid with temporary plugging function, preparation method and application thereof
  • Oil pipe protection fluid with temporary plugging function, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0023] This embodiment provides an oil pipe protection liquid with a temporary plugging function. Based on the total weight of the oil pipe protection liquid with a temporary plugging function as 100%, the oil pipe protection liquid with a temporary plugging function is composed of 76.6% by weight. Water, 0.2% sodium carbonate, 0.05wt% sodium hydroxide, 0.1wt% methanol, 0.2wt% 2,2,4-trimethylpentane, 0.4wt% D-glucuronic acid, 0.05wt % Sodium lauryl sulfate, 1.5% by weight polyanionic cellulose, 0.3% by weight carboxymethyl cellulose, 0.3% by weight methyl tert-butyl ether, 0.3% by weight sulfamic acid, 15% by weight It is prepared from sodium chloride and 5wt% potassium chloride.

Embodiment 2

[0025] This embodiment provides the preparation method of the oil pipe protection liquid with temporary plugging function of embodiment 1, wherein the preparation method includes the following steps:

[0026] a. Add water to the mixing container under normal temperature and stir; according to the ratio of each component in the oil pipe protection solution with temporary plugging function provided in Example 1, add sodium carbonate, sodium hydroxide, methanol, 2, 2, 4 -Trimethylpentane, D-glucuronic acid, sodium lauryl sulfate, polyanionic cellulose, carboxymethyl cellulose, methyl tert-butyl ether (MTBE), sulfamic acid are added to the mixing container in order After stirring for 90 minutes, solution A is obtained;

[0027] b. Add sodium chloride and potassium chloride to the above solution A and stir for 20 minutes to obtain the oil pipe protection solution with temporary plugging function.

Embodiment 3

[0029] This embodiment provides an oil pipe protection liquid with temporary plugging function. Taking the total weight of the oil pipe protection liquid with temporary plugging function as 100%, the oil pipe protection liquid with temporary plugging function is composed of 76.72wt% Water, 0.3wt% sodium carbonate, 0.08wt% sodium hydroxide, 0.2wt% methanol, 0.1wt% 2,2,4-trimethylpentane, 0.3wt% D-glucuronic acid, 0.1 wt% sodium lauryl sulfate, 1.3 wt% polyanionic cellulose, 0.4 wt% carboxymethyl cellulose, 0.2 wt% methyl tert-butyl ether (MTBE), 0.4 wt% sulfamic acid , 10wt% sodium chloride and 10wt% potassium chloride are prepared.

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Abstract

The invention provides an oil pipe protection fluid with a temporary plugging function and a preparation method and an application thereof. 100% of the oil pipe protection fluid with the temporary plugging function is prepared from 76-77% of water, 0.2-0.4% of sodium carbonate, 0.05-0.1% of sodium hydroxide, 0.1-0.2% of methyl alcohol, 0.1-0.2% of 2,2,4-trimethylpentane, 0.3-0.5% of D-glucuronic acid, 0.04-0.1% of lauryl sodium sulfate, 1.3-1.7% of polyanionic cellulose, 0.2-0.4% of carboxymethylcellulose, 0.2-0.5% of methyl tertiary butyl ether, 0.3-0.5% of sulfamic acid, 5-15% of sodium chloride and 5-15% of potassium chloride. The oil pipe protection fluid has low freezing point, will not swell in volume after freezing, has a good antifreezing effect and also has a good temporary plugging function to oil-layer leakage pathways.

Description

Technical field [0001] The invention relates to an oil pipe protection liquid with a temporary plugging function and a preparation method and application thereof, and belongs to the technical field of oil extraction in the process of oil field development. Background technique [0002] In recent years, CO 2 -EOR(CO 2 -Enhanced Oil Recovery (CO2 gas flooding enhanced oil recovery) technology has developed rapidly. Will CO 2 Injecting into the oil layer can not only greatly increase the recovery rate, but also achieve CO 2 The purpose of emission reduction is that the technology can simultaneously meet the dual requirements of efficient reservoir development and environmental protection. However, in the CO 2 In the process of developing oil reservoirs, liquid CO 2 At the initial stage of injection into the well, vaporization occurs instantaneously, causing a sudden drop in local temperature in the wellbore, solidifying the liquid in the tubing, and expanding its volume, which will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/514E21B33/13
CPCC09K8/514E21B33/13
Inventor 李玉梅
Owner SONGYUAN MARINE PETROLEUM TECH CO LTD
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