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A profile control method suitable for heterogeneous oil reservoirs after polymer flooding

A technology for heterogeneous oil reservoirs and polymer flooding, which can be used in chemical instruments and methods, earthwork drilling, drilling compositions, etc., and can solve problems such as limited improvement in crude oil recovery.

Active Publication Date: 2022-07-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many researches on the binary compounding of polymer, PPG and ternary compounding of polymer, PPG, and surfactant, but the effect of improving the water absorption profile of low-permeability reservoir after polymer flooding needs to be improved. Homogeneous profile control means, limited oil recovery improvement

Method used

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  • A profile control method suitable for heterogeneous oil reservoirs after polymer flooding
  • A profile control method suitable for heterogeneous oil reservoirs after polymer flooding
  • A profile control method suitable for heterogeneous oil reservoirs after polymer flooding

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The profile control method for a heterogeneous oil reservoir after polymer flooding in this embodiment includes the following steps: injecting a two-stage heterogeneous slug into the heterogeneous oil reservoir, and the heterogeneous slug includes a polymer and a viscoelasticity Granular PPG, wherein the solid content of the polymer is 90.03%, and the molecular weight is in the range of 32-35 million, which can be selected from commonly used polymer types in the field, such as polyacrylamide. The particle size of PPG in the first-stage heterogeneous slug is 50-150 mesh, and the viscosity is 23.2 mPa s (total dissolved solid TDS is 2282 mg / L, and the temperature is 60 °C). The particle size of PPG is 20-50 mesh, the viscosity is 35.6 mPa·s (the total dissolved solid TDS is 2282 mg / L, and the temperature is 60 °C), and the injection volume of the two-stage heterogeneous slug is 0.04 PV.

[0032] Specifically, PPG samples with small particle size (particle size of 50-150 m...

Embodiment 2

[0034]The specific implementation steps of the profile control method for heterogeneous oil reservoirs after polymer flooding in this example are the same as those in Example 1, except that the composition of the first-stage heterogeneous slug is: 1500mg / LP+1000mg / LIII type PPG, the composition of the second-stage heterogeneous slug is: 1500mg / LP+1000mg / L II type PPG, the injection volume of the two-stage heterogeneous slug is 0.04PV, and the change curve of the core shunt rate is as follows figure 2 The experimental results are shown in Table 1.

Embodiment 3

[0036] The profile control method for heterogeneous oil reservoirs after polymer flooding in this embodiment includes the following steps: injecting two-stage heterogeneous slugs into the Xiaermen H2IV oil group of heterogeneous oil reservoirs, and the heterogeneous slugs Including polymer and viscoelastic particle PPG, the composition of the first-stage heterogeneous slug is: 1000-1500mg / LP+670-1000mg / L Type II PPG, the composition of the second-stage heterogeneous slug is: 1000-1500mg / LP+670-1000mg / L Type III PPG, the ratio of the injection volume of the first-stage heterogeneous slug to the injection volume of the second-stage heterogeneous slug is 4:1. In mine application, different oil wells have different physical properties and different pressure levels, resulting in different injection capacities. Therefore, for the entire oil group, the composition of heterogeneous slugs is 1000-1500mg / LP+670-1000mg / LPPG. The composition of the heterogeneous slug of the oil well is s...

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Abstract

The invention belongs to the technical field of petroleum development, and in particular relates to a profile control method suitable for heterogeneous oil reservoirs after polymer flooding. The method includes the steps of: injecting at least two stages of heterogeneous slugs into a heterogeneous oil reservoir, the heterogeneous slugs comprising polymers and viscoelastic particles, and the different stages of heterogeneous slugs containing viscoelastic particles The particle size is different. The profile control method of the present invention is suitable for heterogeneous oil reservoirs after polymer flooding. For oil reservoirs with more prominent heterogeneity after polymer flooding, heterogeneous slugs containing viscoelastic particles with different particle sizes are injected in stages, and can be respectively The dominant channels with different pore throat sizes are blocked to adjust the uneven longitudinal water absorption profile of the injection well and block the dominant seepage channels of water flooding, effectively adjust the heterogeneity and plane contradiction between layers, and expand the polymer swept volume, Suppress polymer channeling and improve chemical flooding effect.

Description

technical field [0001] The invention belongs to the technical field of petroleum development, and in particular relates to a profile control method suitable for heterogeneous oil reservoirs after polymer flooding. Background technique [0002] Polymer flooding can greatly improve oil recovery and has good economic benefits. However, field tests show that a large amount of crude oil remains in the ground after polymer flooding, and there is a material basis for further tapping the potential. [0003] After polymer flooding, the porosity and permeability structure of the reservoir changes greatly, the heterogeneity is more serious, and the distribution of remaining oil is more scattered and complex. To further block the large pores, improve the heterogeneity and expand the swept volume, more remaining oil can be displaced. Viscoelastic particle PPG has the characteristics of water swelling and compression deformation, which can be injected into the deep part of the reservoir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22E21B33/13C09K8/508
CPCE21B43/16E21B33/13C09K8/5083
Inventor 张卓王正欣薛国勤李岩唐金星李洪生皇海权盛海燕王熙张丽庆
Owner CHINA PETROLEUM & CHEM CORP