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Polymer perforating fluid and preparation method thereof

A technology of polymer and perforating fluid, applied in the field of perforating fluid, to achieve the effect of reducing alkali sensitivity, reducing cost and low core damage rate

Active Publication Date: 2017-07-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there is a lack of a perforating fluid suitable for abnormally high-pressure, high-porosity, high-permeability, and alkali-sensitive reservoirs

Method used

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  • Polymer perforating fluid and preparation method thereof
  • Polymer perforating fluid and preparation method thereof
  • Polymer perforating fluid and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0046] The polymer perforating fluid of this embodiment is composed of the following components in mass percentage: 0.25% polymer thickener, 12% weighting agent, 0.02% drainage aid, 0.015% gel breaker, 0.55% temporary plugging agent, The balance is the flowback treatment water; the weighting agent is a mixture of potassium bromide and sodium chloride in a weight ratio of 1:4, and the gel breaker is sodium persulfate.

[0047] The preparation method of the polymer perforating fluid of the present embodiment comprises the following steps:

[0048] 1) Add 871.65g of flowback treatment water to a 1000mL Wuyin mixer, add 120g of weighting agent at a stirring speed of 200r / min, after the weighting agent is dissolved, add 2.5g of polymer thickener, After stirring at a speed of 20 min, add 0.2 mL of drainage aid and continue stirring for 5 min to obtain a polymer perforating fluid base fluid with a density of 1.11 g / cm 3 ;

[0049] 2) Add 5.5g of temporary plugging agent and 0.15g o...

Embodiment 2

[0051] The polymer perforating fluid of this embodiment is composed of the following components in mass percentage: 0.3% polymer thickener, 16% weighting agent, 0.03% drainage aid, 0.018% gel breaker, 1% temporary plugging agent, The balance is reinjection water; the weighting agent is a mixture of potassium bromide and sodium chloride in a weight ratio of 1.2:3.5, and the breaker is ammonium persulfate.

[0052] The preparation method of the polymer perforating fluid of the present embodiment comprises the following steps:

[0053] 1) Add 826.52g of reinjection water to a 1000mL Wuyin mixer, add 160g of weighting agent at a stirring speed of 400r / min, after the weighting agent is dissolved, then add 3g of polymer thickener, at a speed of 500r / min After stirring for 20 minutes, add 0.3 mL of drainage aid and continue stirring for 5 minutes to obtain polymer perforating fluid base fluid with a density of 1.15 g / cm 3 ;

[0054] 2) Add 10g of temporary plugging agent and 0.18g ...

Embodiment 3

[0056] The polymer perforating fluid of this embodiment is composed of the following components in mass percentage: 0.35% polymer thickener, 22% weighting agent, 0.04% drainage aid, 0.02% gel breaker, 1.5% temporary plugging agent, The balance is reinjection water; the weighting agent is a mixture of potassium chloride and sodium chloride in a weight ratio of 6.4:1.3, and the breaker is ammonium persulfate.

[0057] The preparation method of the polymer perforating fluid of the present embodiment comprises the following steps:

[0058] 1) Add 780.9g of reinjection water to a 1000mL Wuyin mixer, add 200g of weighting agent at a stirring speed of 300r / min, after the weighting agent is dissolved, then add 3.5g of polymer thickener, After stirring at high speed for 30 minutes, add 0.4 mL of drainage aid and continue stirring for 5 minutes to obtain polymer perforating fluid base fluid with a density of 1.19 g / cm 3 ;

[0059] 2) Add 15g of temporary plugging agent and 0.2g of gel...

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Abstract

The invention discloses a polymer perforating fluid and a preparation method thereof. The polymer perforating fluid comprises, by mass, 0.25 to 0.45% of a polymer densifier, 12 to 26% of a weighting agent, 0.02 to 0.08% of a cleanup additive, 0.015 to 0.03% of a gel breaker and 0.55 to 2.5% of a temporary plugging agent, with the balance being water. The polymer perforating fluid provided by the invention has a density adjustable in a range of 1.10 to 1.25 g / cm<3> and has a viscosity of 50 mPa.s or above after shearing for 60 min under the conditions of a temperature of 50 to 100 DEG C and a rotating speed of 1000 / s; a gel-broken fluid has a viscosity of no more than 2 mPa.s and low interfacial tension and can rapidly flow back after construction; and the polymer perforating fluid is especially applicable to high-porosity high-permeability alkali-sensitive strata with abnormally high pressure and has the characteristics of adjustable density, leak-proof and leak-stopping performance, resistance to temperature and shearing, low fluid loss, low corrosion rate, low damage to rock cores, thorough gel breaking and easiness in flowback.

Description

technical field [0001] The invention belongs to the technical field of perforating fluid, and in particular relates to a polymer perforating fluid and a preparation method thereof. Background technique [0002] Perforating fluid is the completion fluid used when perforating a well during the well completion process. Completion fluid is a fluid that directly contacts the reservoir, and its performance is directly related to the reserves and production of the oil field. The damage of perforating fluid to the reservoir is mainly reflected in the following aspects: the solid phase particles in the perforating fluid block the pore throat; The crude oil produced emulsion, or caused the wetting reversal of the reservoir, increasing the oil flow resistance. The development of perforating fluids with comprehensive properties such as low fluid loss, low corrosion rate, low core damage, and easy flowback has a good application prospect. [0003] CN103146373B discloses a hydraulic sa...

Claims

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Application Information

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IPC IPC(8): C09K8/12
CPCC09K8/12
Inventor 李梦楠冯兴武张坤刘欣刘洪涛蒋尔梁张婷李影
Owner CHINA PETROLEUM & CHEM CORP
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