Inorganic gel deep profile control and flooding method in high salt oil reservoir.

An inorganic gel and oil reservoir technology, which can be used in earth-moving drilling, wellbore/well components, production fluids, etc.

Inactive Publication Date: 2020-06-02
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with organic materials, inorganic material profile control and flooding agents have the advantages of wide source, low price, temperature resistance, salt resist

Method used

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  • Inorganic gel deep profile control and flooding method in high salt oil reservoir.
  • Inorganic gel deep profile control and flooding method in high salt oil reservoir.
  • Inorganic gel deep profile control and flooding method in high salt oil reservoir.

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for deep control and flooding of inorganic gel in high-salt reservoirs, said method comprising the following steps:

[0021] Step 1: Analyze the ion composition of the injected water first, and calculate and remove Ca in the injected water based on the analysis results 2+ and Mg 2+ Need to add Na 2 CO 3 concentration, and finally inject water with Na 2 CO 3 Mix in proportion and remove CaCO by gravity or swirling 3 and MgCO 3 , to obtain demineralized water;

[0022] Step 2, using demineralized water to prepare the main agent Na 2 SiO 3 Solution, using demineralized water as spacer;

[0023] Step 3: At least 5 rounds of alternate injection methods are used to sequentially inject into the reservoir: spacer fluid → main agent → spacer fluid → injected water (softened water).

[0024] The main agent is Na 2 SiO 3 , the concentration is 0.02mol / L~0.1mol / L, and the increasing range of concentration in each round is 0.003mol / L~0.006mol / L; the alternating ...

Embodiment 2

[0027] Experimental plan and effect analysis:

[0028] 1. Experimental conditions

[0029] 1.1 Experimental materials

[0030] (1), the main agent

[0031] The main agent is sodium silicate Na 2 SiO 3 (analytical pure), produced by Sinopharm Chemical Reagent Co., Ltd., purchased from the market.

[0032] (2), water

[0033] The experimental water was injection water and demineralized water, and the ion composition is shown in Table 1.

[0034] Table 1 Water quality analysis of injected water

[0035]

[0036] Demineralized water is water obtained by adding calcium hydroxide-sodium carbonate or sodium hydroxide-sodium carbonate or sodium phosphate to the injected water to eliminate calcium and magnesium ions in the water.

[0037] (3), core

[0038] The experimental core is quartz sand epoxy resin cemented artificial core, geometric dimensions: height × width × length = 4.5cm × 4.5cm × 60cm, permeability Kg≈1500×10 -3 μm 2 . Put the core into the core holder, and ...

Embodiment 3

[0099] 1. Experimental plan

[0100] 1.1 Pharmacy

[0101] The main agent is sodium silicate Na 2 SiO 3 (analytical pure), produced by Sinopharm Chemical Reagent Co., Ltd., purchased from the market.

[0102] 1.2. Experimental water

[0103] The experimental water was injected water and demineralized water, and the ion composition is shown in Table 6.

[0104] Table 6 Water Quality Analysis of Injected Water

[0105]

[0106] Demineralized water is water obtained by adding "calcium hydroxide / sodium carbonate or sodium hydroxide / sodium carbonate or sodium phosphate" to the injected water to eliminate calcium and magnesium ions in the water.

[0107] The viscosity of the experimental oil at 55°C is 6mPa·s.

[0108] 1.3. Core

[0109] The experimental core is a quartz sand epoxy resin cemented artificial core, and its geometric dimensions are: height×width×length=4.5cm×4.5cm×30cm. There are 4 types of cores, core Ⅰ: high permeability layer Kg=800×10 -3 μm 2 , middle ...

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Abstract

The invention belongs to the technical field of oil recovery, and particularly relates to an inorganic gel deep profile control and flooding method in a high salt oil reservoir. The inorganic gel deepprofile control and flooding method includes the steps that first, the composition analysis of injected water ions is carried out, based on the analysis results, the concentration of Na2CO3 needed toremove Ca<2+> and Mg<2+> from injected water is calculated, finally, the injected water is mixed with the Na2CO3 in proportion, a gravity or rotational flow method is used for removing CaCO3 and MgCO3, and softened water is obtained; a main agent Na2SiO3 solution and isolation solution are prepared by the softened water; and at least five rounds of alternating injection are adopted to inject theisolation solution, the main agent, the isolation solution and the injected water into the oil reservoir sequentially. The chemical reaction between Ca<2+> and Mg<2+> in the injected water and the added Na2SiO3 in the deep part of the high permeability oil reservoir is used for forming inorganic gel CaSiO3 and MgSiO3 so that the purposes of the permeability of a high permeability layer and the diversion of deep solution flow can be achieved.

Description

Technical field: [0001] The invention belongs to the technical field of oil production, and in particular relates to an inorganic gel deep control and flooding method for high-salt oil reservoirs. Background technique: [0002] As the development of domestic old oilfields gradually enters the development stage of medium-high water cut, the heterogeneity of reservoirs is gradually intensified, and the inefficient and ineffective circulation of injected water is becoming more and more serious. At present, commonly used profile control and flooding agents in oil fields are mainly divided into two categories: organic materials and inorganic materials. Organic materials include polymer solutions, polymer gels and polymer microspheres, etc., and inorganic materials include clay, fly ash, cement, Inorganic geopolymers and inorganic gels, etc. Compared with organic materials, inorganic material profile control and flooding agents have the advantages of wide source, low price, tempe...

Claims

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Application Information

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IPC IPC(8): E21B33/13E21B43/20
CPCE21B33/13E21B43/20
Inventor 刘义刚卢祥国张云宝李彦阅曹伟佳曹豹刘进祥谢坤
Owner CHINA NAT OFFSHORE OIL CORP
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