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A low-viscosity method for suppressing ineffective circulation and greatly improving oil recovery

An ineffective circulation, large-scale technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve problems such as unsatisfactory effects, and achieve the effect of solving ineffective circulation problems, improving oil recovery, and low viscosity

Active Publication Date: 2022-07-29
郭志东 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to control the speed of fluid flow diversion and suppress the reversal of diverted fluid flow, many new polymers and depth profile control technologies have been developed, but the effect is not ideal and cannot fundamentally solve this problem

Method used

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  • A low-viscosity method for suppressing ineffective circulation and greatly improving oil recovery
  • A low-viscosity method for suppressing ineffective circulation and greatly improving oil recovery
  • A low-viscosity method for suppressing ineffective circulation and greatly improving oil recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1: Obtaining low and stable viscosity

[0051] The system has stable viscosity and low viscosity, which is conducive to entering the high-permeability deep part and starting the low-permeability part. The ineffective circulation inhibitor solutions with concentrations of 500mg / L, 1000mg / L, 1500mg / L, 2000mg / L and 2500mg / L were placed in a constant temperature oven at 45 degrees, and the viscosities were 2 mPa.s, 5 mPa.s, 8 About mPa.s, 10 mPa.s, 15 mPa.s, and 20 mPa.s, the viscosity was tested for 1 d, 3 d, 7 d, 15 d, 30 d, 60 d, and 120 d, and the viscosity remained basically unchanged. see attached figure 1 .

Embodiment 2

[0052] Example 2: The water phase permeability is greatly reduced and the stabilization time is long

[0053] Select 1500mg / L of ineffective circulation inhibitor solution, that is, inject a small slug into the tested solution, each time it is a freshly prepared solution, inject 0.05PV, and then inject 2 times the dead volume of simulated water, and then place it at the reservoir temperature 15 days, after accumulative injection of 0.2PV, each injection of 0.05PV of the newly prepared solution was placed for 15 days, and then 1PV of water was injected at the same speed to test the water permeability. After selecting the same concentration of conventional polymer solution and injecting 0.3PV, measure the water phase permeability, leave it for 15 days, 30 days, and 60 days to measure the water phase permeability, and measure it every other month until the water phase permeability does not change. For the cores of 2000mD and 4000mD, the permeability of the water phase decreased b...

Embodiment 3

[0054] Example 3: Controllable flow diversion time

[0055] Core experiment: The air permeability of artificial core is 2000mD, and the size is 4.5*45*30cm. A comparative test of polymer and ineffective circulation inhibitor injection performance (injection pressure) and retention capacity (follow-up waterflood pressure) was conducted. On the day of solution preparation, the ineffective circulation inhibitor showed the same injection ability and retention capacity as the regular polymer with equal concentration, indicating that the newly formulated ineffective circulation inhibitor had good injection performance. After being placed for 30 days, the injection capacity of the two did not change, but the retention capacity changed significantly. The retention capacity of the polymer did not change as before, but the ineffective circulation inhibitor changed greatly, and the subsequent water flooding pressure greatly changed. rise. More importantly, the subsequent water flooding...

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Abstract

The present invention provides a low-viscosity method for inhibiting ineffective circulation and greatly improving oil recovery, comprising a low-viscosity injection system, inhibiting the reverse of the liquid flow that has been turned, and controlling the time of the liquid flow turning, the low-viscosity injection system is The mother liquor concentration can be configured up to 10000mg / L, the configuration time is shortened to 1 hour, and it has higher temperature resistance and salt resistance than the polymer. The present invention is mainly based on the permeability threshold of irreducible oil, which is positively correlated with the permeability gradient (starting position and adjacent positions) and displacement fluid viscosity (entering the starting position), and is inversely correlated with the pressure gradient (starting position). The system of the present application has low viscosity, strong ability to reduce core permeability, and the ability to reduce the threshold of start-up permeability is much better than that of conventional polymers, which not only realizes deep liquid flow diversion, but also inhibits the reversal of diverted liquid flow, and successfully solves the problem of oil field The common problem of ineffective circulation in development has achieved the purpose of increasing the recovery rate of polymer flooding by a larger margin than that of the previous year.

Description

technical field [0001] The invention relates to the technical field of mining, in particular to a low-viscosity method for inhibiting ineffective circulation and greatly improving the recovery rate. Background technique [0002] No matter which mining method is used, the degree of heterogeneity of the reservoir is one of the decisive factors for the ultimate oil recovery. Generally speaking, the more severe the degree of heterogeneity, the lower the recovery. At present, the main exploitation method of oilfields in the world is mainly water flooding, and the water flooding recovery rate is generally about 30%. How to solve the ineffective circulation of heterogeneous oil reservoirs has always been a key technical problem in the development of old oilfields. For this reason, many technologies such as shallow profile control, deep profile control and polymer flooding have been developed. The shallow profile control treatment radius is small. Once the displacement fluid bypass...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/20E21B43/22E21B49/00
CPCE21B43/20E21B43/16E21B49/00
Inventor 郭志东吴昕蔓
Owner 郭志东
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