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Solid phase-free high-density completion fluid and preparation method thereof

A completion fluid, high-density technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as the inability to prepare transparent completion fluids

Active Publication Date: 2020-10-16
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] This application provides a high-temperature-resistant high-density solid-free completion fluid compounded by calcium bromide, zinc chloride and imidazoline additives, which overcomes the problem of using only zinc chloride dissolved in water at room temperature to increase the density to 1.85 g / cm 3 After that, it will no longer dissolve, and then add zinc chloride solution to become milky white, and the density of calcium bromide saturated aqueous solution is only 1.68g / cm 3 、The density ≥ 2.0g / cm cannot be prepared with separate zinc chloride and calcium bromide 3 The problem of clear completion fluid

Method used

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Examples

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preparation example Construction

[0045] In the embodiment of the present application, the preparation method of the oleic imidazoline comprises:

[0046] a) Add water-carrying agent, oleic acid and polyethylene polyamine in reaction container, mix and stir to obtain mixture;

[0047] b) heating and adjusting the temperature of the mixture to 140°C to 180°C, the reaction time is 1.0h to 2.0h; the preferred temperature is 160°C, and the preferred reaction time is 1.5h;

[0048] c) heating and adjusting the temperature of the mixture to 180°C to 240°C, and reacting for 4.5h to 7.5h; the preferred temperature is 220°C, and the preferred reaction time is 6.5h;

[0049] d) cooling the product in the reaction vessel heated in step c) to room temperature to obtain oleic imidazoline.

[0050] In the embodiment of the present application, the molar ratio of oleic acid to polyethylene polyamine is 1.0:(1.2 to 1.3), and the amount of water-carrying agent is 30wt.% of the mass of oleic acid.

[0051] In the embodiment o...

Embodiment 1

[0066] In this example, calcium bromide is AR grade, with a purity of 98%, and zinc chloride: GR grade, with a purity of 98%, purchased from Chengdu Huaxia Chemical Reagent Co., Ltd.

[0067] The preparation method of completion fluid in this embodiment is as follows:

[0068] Add 200.0g of tap water to a 1000mL beaker at room temperature, then add 440.0g of raw calcium bromide, and stir with a stirrer at 1000 rpm. After the calcium bromide solid dissolves, the solution becomes translucent and pale white. The turbidity of the solution It is 70.0NTU, add 420.0g raw material zinc chloride immediately, cool to normal temperature after stirring zinc chloride to dissolve, this moment solution is colorless and transparent, and turbidity is 7.6NTU, then adds 2.65g imidazoline additive in this solution, in Stir, dissolve and disperse evenly at 1000 rpm to prepare a high-temperature-resistant high-density solid-free completion fluid A; at this time, the components of the completion flu...

Embodiment 2

[0077] In this example, calcium bromide is AR grade, with a purity of 98%, and zinc chloride: GR grade, with a purity of 98%, purchased from Chengdu Huaxia Chemical Reagent Co., Ltd.

[0078] The preparation method of completion fluid in this embodiment is as follows:

[0079] Add 200.0g of tap water to a 1000mL beaker at room temperature, then add 440.0g of raw calcium bromide, and stir with a stirrer at 1000 rpm. After the calcium bromide solid dissolves, the solution becomes translucent and pale white. The turbidity of the solution It is 70.0NTU, add 440.0g raw material zinc chloride immediately, cool to normal temperature after stirring zinc chloride to dissolve, this moment solution is colorless and transparent, and turbidity is 21.3NTU, then add 2.70g imidazoline additive in this solution, in Stir, dissolve and disperse evenly at 1000 rpm to prepare high-temperature-resistant high-density solid-free completion fluid B; at this time, the components of completion fluid B a...

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Abstract

The invention discloses a solid phase-free high-density completion fluid which comprises water, calcium bromide, zinc chloride and an imidazoline additive, wherein the mass ratio of the water to the calcium bromide to the zinc chloride to the imidazoline additive is 10 to (22 to 24) to (21 to 22) to (0.1325 to 0.14). Calcium bromide and zinc chloride are compounded, and an imidazoline additive isadded, so that the high-temperature-resistant high-density solid-phase-free completion fluid of which density is greater than the density of calcium bromide and zinc chloride which are respectively and independently dissolved in water to reach saturation is prepared, the density of the completion fluid is (2.002-2.037) g / cm<3>, solution fluidity is good, apparent viscosity is less than or equal to19.50 mPa.s, the corrosion rate of 13Cr steel coupon at 200 DEG C under normal pressure is less than or equal to 0.0333 mm / a, the clay anti-swelling rate is more than or equal to 87.0%, the solutionis transparent and colorless, the turbidity is less than or equal to 28.5 NTU, and a powerful scientific and technological support is provided for well completion and well repair of an ultra-deep high-temperature oil-gas well.

Description

technical field [0001] This article relates to the field of well completion in oil and natural gas exploitation, and specifically relates to a solid-free high-density well completion fluid and its preparation method. Background technique [0002] Completion fluid is mainly used in various operations of well completion and workover in oil and natural gas extraction. It is a kind of production fluid that consumes a large amount of fluid and is closely related to reservoir performance protection and oil layer pollution. From the production layer to the official production, any liquid used in contact with the production layer due to operational needs is called completion fluid, and completion fluid includes workover fluid in a broad sense. The fluids used in operations to maintain or increase productivity from the start of production are collectively referred to as workover fluids. The main function of the completion fluid is to meet the temperature and pressure requirements of...

Claims

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Application Information

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IPC IPC(8): C09K8/06
CPCC09K8/06
Inventor 王冲敏苗海龙孙强李自立耿铁罗鸣张红生胡永堂陈波张万栋
Owner CHINA NAT OFFSHORE OIL CORP
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