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Viscosity-reducing pressure-driving method for deep low-permeability heavy oil reservoir

A viscous reduction technology for heavy oil reservoirs, applied in earthwork drilling, wellbore/well components, production fluids, etc., can solve the problems of insufficient energy supplementation, rapid production decline, etc., and improve the sweep coefficient and oil displacement efficiency , low cost, conducive to the effect of popularization and application

Pending Publication Date: 2022-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a single viscosity reducer huff and puff has a certain initial production, for closed reservoirs, the energy supplement is insufficient, and the later production declines rapidly

Method used

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  • Viscosity-reducing pressure-driving method for deep low-permeability heavy oil reservoir
  • Viscosity-reducing pressure-driving method for deep low-permeability heavy oil reservoir
  • Viscosity-reducing pressure-driving method for deep low-permeability heavy oil reservoir

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 As shown, the viscosity reduction and pressure flooding method of the deep low-permeability heavy oil reservoir comprises the following steps:

[0038] Step 1. Screening and evaluation to determine the viscosity-reducing displacement system: take the viscosity-reducing rate and the reduction of oil / water interfacial tension as the main screening and evaluation indicators; the determined viscosity-reducing displacement system meets the following conditions: the organic chlorine content is 0.0%, and the appearance is a homogeneous liquid , no impurity, no irritating smell, pH value between 6.0-9.0; viscosity reducer and reservoir fluid are tested for compatibility, after compatibility, the viscosity reduction rate is not less than 90%, and the interfacial tension is 1×10 -1 Below mN / m.

[0039] Step 2: Optimizing and determining the well pattern and spacing of the reservoir for viscosity reduction and pressure flooding: according to the geological condit...

Embodiment 2

[0047] The viscosity-reducing pressure flooding method of the deep low-permeability heavy oil reservoir comprises the following steps:

[0048] Step 1. Screening and evaluation to determine the viscosity-reducing displacement system: take the viscosity-reducing rate and the reduction of oil / water interfacial tension as the main screening and evaluation indicators; the determined viscosity-reducing displacement system meets the following conditions: the organic chlorine content is 0.0%, and the appearance is a homogeneous liquid , no impurity, no irritating smell, pH value between 6.0-9.0; viscosity reducer and reservoir fluid are tested for compatibility, after compatibility, the viscosity reduction rate is not less than 90%, and the interfacial tension is 1×10 -1 Below mN / m.

[0049] Step 2: Optimizing and determining the well pattern and spacing of the reservoir for viscosity reduction and pressure flooding: according to the geological conditions and development status of th...

Embodiment 3

[0057] The Shasichunxia 3 sand formation in Wang 152 block of Wangjiagang Oilfield is deep low-permeability heavy oil. Exploration well Wang 152 in the work area was drilled in April 2011. Industrial oil flow was obtained in hot test, and then 6 evaluation wells were deployed and drilled. To break through the production capacity barrier, a variety of mining methods were adopted in the trial production process: conventional steam injection thermal recovery, fracturing reconstruction + steam injection thermal recovery, and viscosity reduction cold recovery huff and puff all failed to achieve a breakthrough in production capacity. In April 2020, the Wang 152-X6 well group carried out a viscosity reduction pilot test, which broke through the productivity barrier. The average daily oil production of a single well in the well group was 3.3t / d, which was 3 times that of the previous measures, and the production effect was significantly improved. In order to further efficiently produce...

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Abstract

The invention relates to the technical field of oilfield development, in particular to a viscosity-reducing pressure-driving method for a deep low-permeability heavy oil reservoir. The method comprises the following steps: step 1, screening, evaluating and determining a viscosity reduction displacement system; 2, optimizing and determining the well pattern and well spacing of oil reservoir viscosity reduction pressure drive; 3, the viscosity reduction system is injected into the injection well in a high-pressure, high-speed and large-displacement mode to displace a slug, and soaking is conducted; the injection amount and the injection concentration of the viscosity reducer are optimized; 4, shutting in the well after viscosity reduction huff and puff of the production well is conducted; determining an optimal viscosity-reducing huff-puff effect guiding scheme; 5, the production well is opened for production; and 6, circulating the steps 3-5 until the development is finished. According to the method, the production pressure difference between the injection wells and the production wells is increased, a large number of three-dimensional fracture nets are formed, and the pore-seepage structure of the stratum is improved; the sweep efficiency and the oil displacement efficiency of the viscosity reducer solution are greatly improved, the oil phase viscosity is greatly reduced, and the flowing capacity of liquid in a stratum is greatly improved, so that the oil well productivity is greatly improved, the oil reservoir recovery efficiency is finally improved, and efficient development is achieved.

Description

technical field [0001] The invention relates to the technical field of oilfield development, and relates to a viscosity reduction and pressure flooding method for deep low-permeability heavy oil reservoirs. Background technique [0002] At present, there are 39 units of deep low-permeability heavy oil (depth greater than 900m and permeability less than 300 mD) in the east of Shengli Oilfield, covering geological reserves of 96.29 million tons, accounting for 30% of the undeveloped heavy oil resources in the east of Shengli Oilfield. The largest undeveloped heavy oil reserve position in the oil region. [0003] Thick oil, low permeability, and deep burial, these unfavorable factors are "bound" together and become a "serial array" that prevents this type of reservoir from realizing profitable development. Deep burial, low enthalpy utilization rate, large steam heat loss; thick oil and low permeability lead to high reservoir start-up pressure, poor formation fluid seepage capa...

Claims

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Application Information

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IPC IPC(8): E21B43/22E21B43/30
CPCE21B43/16E21B43/30
Inventor 陈桂华邴绍献吴光焕韦涛邓宏伟杨艳霞王一平赵衍彬路言秋王曦
Owner CHINA PETROLEUM & CHEM CORP
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