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Simulation experiment method and device capable of increasing crude oil recovery ratio of multi-layer heterogeneous reservoir

A heterogeneous reservoir and simulation experiment technology, applied in the field of chemical flooding, can solve the problems of high-concentration polymer flooding injection difficulties, etc., and achieve the effects of improving microscopic oil washing efficiency, improving liquid absorption profile, and increasing liquid absorption volume

Inactive Publication Date: 2017-05-10
CNOOC TIANJIN BRANCH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Strong vertical heterogeneity will seriously restrict the performance of polymer flooding. For oil layers with strong heterogeneity, the single slug injection method is prone to profile inversion, and the displacement fluid will burst into the high-permeability layer and low-permeability layer. There is still a large amount of remaining oil that has not been produced, and high-concentration polymer flooding will cause problems such as injection difficulties

Method used

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  • Simulation experiment method and device capable of increasing crude oil recovery ratio of multi-layer heterogeneous reservoir
  • Simulation experiment method and device capable of increasing crude oil recovery ratio of multi-layer heterogeneous reservoir
  • Simulation experiment method and device capable of increasing crude oil recovery ratio of multi-layer heterogeneous reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] use figure 1 The experimental setup shown is for the alternate injection experiments of poly-surface binary / gel systems in multilayer heterogeneous reservoirs.

[0050] (1) After evacuating the three-layer heterogeneous core, saturate the simulated formation water, inject water at a rate of 1.0mL / min, and calculate the water phase permeability until the pressure is stable;

[0051] The simulated water is simulated on-site water of Bohai S Oilfield, and its ion composition is shown in Table 2.

[0052] Table 2 Ionic composition of simulated formation water

[0053] Ionic composition K + +Na +

Mg 2+

Ca 2+

Cl -

SO 4 2-

HCO 3 -

CO 3 2-

TDS Concentration (mg / L) 489.90 17.02 72.40 602.65 19.18 414.94 63.00 1679.09

[0054] Chemicals for preparing mixed water: NaCl (analytical pure), KCl (analytical pure), NaHCO 3 (analytical pure), Na 2 SO 4 (analytical pure), CaCl 2 (analytical pure), MgCl 2 ...

Embodiment 2

[0062] use figure 1 The experimental setup shown is for the alternate injection experiments of poly-surface binary / gel systems in multilayer heterogeneous reservoirs.

[0063] The specific steps and conditions of (1)-(3) are the same as in Example 1.

[0064] (4) Inject a slug of 0.15PV gel system at an injection rate of 1.0 mL / min, and the experimental gel system is 0.2% FH100+0.2% FH107 with a fixed concentration.

[0065] (5) Inject 0.15PV poly-surface binary system slug, the injection rate is 1.0mL / min, the surfactant in the poly-surface binary system is petroleum sulfonate SYH-1, the concentration is 1250mg / L, poly-surface binary system The polymer in the system is polyacrylamide SNF3830 with a concentration of 1500mg / L. Record the fluid production, water and oil production, and pressure, and calculate the total amount of crude oil driven by the polymer to calculate the recovery factor.

[0066] (6) Inject water at a flow rate of 1.0ml / min for subsequent water flooding,...

Embodiment 3

[0069] use figure 1 The experimental setup shown is for the alternate injection experiments of poly-surface binary / gel systems in multilayer heterogeneous reservoirs.

[0070] The specific steps and conditions of (1)-(3) are the same as in Example 1.

[0071] (4) A slug of 0.2PV gel system was injected, and the injection speed was 1.0 mL / min. The gel system used in the experiment was 0.2% FH100+0.2% FH107, and the concentration was fixed.

[0072] (5) Inject 0.1PV poly-surface binary system slug, the injection speed is 1.0mL / min, the surfactant in the poly-surface binary system is petroleum sulfonate SYH-1, the concentration is 1250mg / L, poly-surface binary system The polymer in the system is polyacrylamide SNF3830 with a concentration of 1500mg / L. Record the fluid production, water and oil production, and pressure, and calculate the total amount of crude oil driven by the polymer to calculate the recovery factor.

[0073] (6) Inject water at a flow rate of 1.0ml / min for sub...

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Abstract

The invention discloses a simulation experiment method and device capable of increasing crude oil recovery ratio of multi-layer heterogeneous reservoir. The simulation experiment method comprises the following steps that a multi-layer heterogeneous core is saturated through simulation formation water and crude oil in sequence; the simulation formation water is injected into the multi-layer heterogeneous core for water drive, when the water content in produced liquid is higher than 90%, gel and a polymer / surfactant compound system are sequentially adopted for being injected alternatively for oil displacement, the simulation formation water is adopted for follow-up water drive, and then the purpose of increasing the crude oil recovery ratio of the multi-layer heterogeneous reservoir is achieved; the polymer / surfactant compound system is an aqueous solution of a polymer and a surfactant. According to the simulation experiment method capable of increasing the crude oil recovery ratio of the multi-layer heterogeneous reservoir, related technical parameters are provided for a multi-layer heterogeneous reservoir polymer flooding field test, and service is provided for oilfield production.

Description

technical field [0001] The invention relates to a simulation experiment method and device for increasing the oil recovery rate of multi-layer heterogeneous oil reservoirs, belonging to the technical field of chemical flooding. Background technique [0002] Polymer flooding technology has been widely used in domestic oil fields, and has made great contributions to enhancing oil recovery. However, for multi-layer heterogeneous reservoirs, when the polymer flooding enters the middle and late stages, with the continuous increase of the liquid absorption of the middle and low permeability layers, the starting pressure of the liquid absorption increases rapidly, and the suction pressure difference decreases continuously, even less than that of polymer injection. The pressure difference at the beginning causes the phenomenon of "inversion of liquid absorption profile", which seriously affects the effect of polymer flooding. In the process of polymer flooding, the phenomenon of pro...

Claims

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Application Information

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IPC IPC(8): E21B33/13E21B43/22E21B49/00C09K8/58
CPCE21B33/13C09K8/58E21B43/16E21B49/00
Inventor 曾杨康晓东张健杨光崔盈贤
Owner CNOOC TIANJIN BRANCH
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