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A Method for Evaluating the Permeability Reduction of Oilfield Reservoir by Polymer Solution

A polymer solution, permeability technology, used in permeability/surface area analysis, suspension and porous material analysis, instrumentation, etc., can solve problems such as reducing permeability

Active Publication Date: 2018-09-21
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the indoor methods for evaluating the permeability reduction ability of polymers are to measure the resistance coefficient and residual resistance coefficient of the polymer in the core. This method is measured under the condition of no oil in the core. It has a certain oil saturation, which leads to the limitation of the method of determining the reduced permeability of polymer solution by drag coefficient and residual drag coefficient

Method used

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  • A Method for Evaluating the Permeability Reduction of Oilfield Reservoir by Polymer Solution
  • A Method for Evaluating the Permeability Reduction of Oilfield Reservoir by Polymer Solution
  • A Method for Evaluating the Permeability Reduction of Oilfield Reservoir by Polymer Solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: JZ9-3 Oilfield Permeability Reduction Rate

[0042] The average hydraulic permeability of JZ9-3 oilfield reservoirs is 500×10 -3 μm 2 .

[0043] (1) Put 20g of quartz sand into a sand filling pipe with a length of 30cm and a diameter of 2.5cm, then put the sand filling pipe under a manual hydraulic press and press it under 8MPa pressure for 2 minutes, repeat the above steps until the sand filling pipe is filled.

[0044] (2) Connect the sand-filling pipe to the vacuum pump, evacuate and saturate water under 0.1MPa negative pressure, the core porosity obtained by experiment is 31%; put the sand-filling pipe in figure 1 In the shown polymer flooding physical simulation device, connect the pipeline. At 57°C, the simulated formation water was injected at a rate of 1ml / min. The salinity of the simulated formation water is shown in Table 1. The water permeability K1 was measured, and the measured K1 was 487×10 -3 μm 2 , where the relative error with the averag...

Embodiment 2

[0049] Example 2: SZ36-1 Oilfield Permeability Reduction Rate

[0050] The average hydraulic permeability of SZ36-1 oilfield reservoir is 850×10 -3 μm 2 .

[0051](1) Put 20g of quartz sand into a sand filling tube with a length of 30cm and a diameter of 2.5cm, then place the sand filling tube under a manual hydraulic press and press it under a pressure of 5MPa for 1 minute, repeat the above steps until the sand filling tube is filled.

[0052] (2) Connect the sand filling pipe to the vacuum pump, vacuum and saturate the water under negative pressure of 0.1 MPa, the core porosity is 28% according to the experiment; put the sand filling pipe in the polymer flooding physical simulation device, and connect the pipeline. At 65°C, the simulated formation water was injected at a rate of 1ml / min. The salinity of the simulated formation water is shown in Table 2. The water permeability K1 was measured, and the measured K1 was 812×10 -3 μm 2 , where the relative error with the aver...

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Abstract

The invention discloses a method of evaluating polymer solution lowering the permeability of oil field storage layer. The method comprises the steps that 1, a simulate rock core I is prepared; 2, the simulate rock core I is vacuumed and water saturated under the pressure load condition, the sponginess of the simulate rock core I is measured; under the oil reservoir temperature, simulate stratum water is injected into the simulate rock core, the measured water permeability rate is recorded as K1; 3, crude oil of the target oil field is injected into the simulate rock core I, and the aging of oil is carried out; 4, the fillings in a sand tube is taken out and dried as a mixture of quartz sand / crude oil / polymer, the sand tube is used as a simulate rock core pillar, the mixture of quartz sand / crude oil / polymer is used a fillings to prepare a simulate rock core II; 5, the step of 2 is repeated, the decreasing rate of the permeability rate of the target oil field storage layer is obtained by formula 1. The method fully considers the circumstances of mixing crude oil / polymer / quartz sand, and is closer to the realities of oil reservoir.

Description

technical field [0001] The invention relates to a method for evaluating the permeability reduction of oilfield reservoirs by a polymer solution, and belongs to the technical field of oilfield chemical flooding enhancement of oil recovery. Background technique [0002] At present, polymer flooding technology has become the main means of enhancing oil recovery in major oil fields. Long-term injection of polymer solution will adsorb and stay in the reservoir, thereby reducing reservoir permeability and improving water flooding mobility. At present, the method for indoor evaluation of the permeability reduction ability of polymers is mostly to measure the resistance coefficient and residual resistance coefficient of the polymer in the core. This method is measured under the condition of no oil in the core. There is a certain degree of oil saturation, which leads to certain limitations in the method of measuring the reduced permeability of polymer solutions by drag coefficient a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08G01N33/00
CPCG01N15/08G01N15/088G01N33/00
Inventor 康晓东杨光崔盈贤王大威赵娟朱玥珺赵文森
Owner CHINA NAT OFFSHORE OIL CORP