Low-elasticity microspheres for flood control and composite flood control system and flood control method containing them

A technology of elastic microspheres and controlled flooding, which is applied in chemical instruments and methods, drilling compositions, and production fluids. The effect of adjusting the flooding effect, increasing the swept volume, and improving the temperature and salt tolerance

Active Publication Date: 2018-10-09
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current industrialized granular system has high strength and poor deformability, which is easy to stay in the formation and shear failure, and it is difficult to effectively migrate in the porous medium without open fractures.
In order to maximize oil recovery, it is urgent to develop a granular control and displacement system that can truly realize deep control and displacement. It can not only effectively solve the problems of poor injection performance and easy shear damage of granular systems, but also improve oil washing. Efficiency, to achieve long-term effective control and drive effect

Method used

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  • Low-elasticity microspheres for flood control and composite flood control system and flood control method containing them
  • Low-elasticity microspheres for flood control and composite flood control system and flood control method containing them
  • Low-elasticity microspheres for flood control and composite flood control system and flood control method containing them

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] This embodiment provides a kind of low-elastic microspheres for regulating and driving, which is prepared by the following method:

[0056] Add 60mL of kerosene and 0.6g of dispersant SP-60 into a four-necked reaction flask equipped with an electric stirrer, reflux condenser, thermometer and nitrogen conduit, stir until the dispersant is completely dissolved, and then drip it with a constant liquid funnel under nitrogen protection. Add mixed solution 20g (this mixed solution is made of 6g acrylamide, 0.2g 2-acrylamide-2-methylpropanesulfonic acid, 0.0006g N, N'-methylenebisacrylamide, 0.254g concentration is 15wt% hydrogen Sodium oxide solution, 0.34g concentration is the ammonium chloride solution of 15wt%, 0.005g polyethylene glycol and distilled water surplus composition), simultaneously with the speed stirring of 500rpm, after dropping, add dropwise 1.0g concentration is 15wt% over Ammonium sulfate solution, at the same time using a water bath to gradually raise the...

Embodiment 2

[0063] This embodiment provides a heterogeneous composite flood control system containing the low-elasticity microspheres prepared in Example 1, based on the total weight of the heterogeneous composite flood control system, it includes: implementation The low elastic microsphere 0.1% that example 1 prepares, petroleum sulfonate surfactant (PS) 0.4%, partially hydrolyzed polyacrylamide (HPAM) 0.1% and water (as dosing) balance, the weight percent of each component The sum is 100%; wherein, the petroleum sulfonate surfactant is petroleum sulfonate surfactant BHS-01 (developed by Dagang Oilfield Oil Production Technology Research Institute), its solid content ≥ 35%, lightning ≥ 60 ° C, The pH value (0.3wt% aqueous solution) is 7-9; the molecular weight of the partially hydrolyzed polyacrylamide is 27.4 million, and the degree of hydrolysis is 23.8%; the water is formation water and / or treated oilfield reinjection water.

[0064] The heterogeneous composite flood control system is...

Embodiment 3

[0066] This example provides how the low-elastic microspheres prepared in Example 1 pass through the glass etching model. The deformation and passage of the low elastic microsphere in the pore throat in the model is shown in Figure 4a , Figure 4b with Figure 4c . When the particle size of the microsphere is larger than the pore throat, under the action of a sufficiently large pressure difference, the pore throat is squeezed to lose water and undergo elastic deformation. During this process, the low-elasticity microsphere can carry the film-like residual oil on the surface of the pore throat After passing through the pore throats, the extrusion and stretching effects from the pore throats disappear, and the low-elastic microspheres absorb water again and return to their original size. During the process of shape restoration, the low-elastic microspheres expand toward the normal direction, and cannot be driven out before reaching the The "amoeba" characteristics of low ela...

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Abstract

The invention provides low-elasticity microballoons for profile control and displacement, a compound control and displacement system with low-elasticity microballoons, and a control and displacement method. The low-elasticity microballoons are high-deformability and shear-resistant nanometer and micrometer polymer gel microspheres with granularity of 0.1-500 microns and elasticity modulus of 10-100 Pa. The compound control and displacement system is prepared from, by weight, 0.1-0.3% of low-elasticity microspheres, 0.1-0.4% of mahogany petroleum sulfonate surface active agent, 0.1-0.3% of partially hydrolyzed polyacrylamide and the balance water. The control and displacement method at least includes the following step of injecting the compound control and displacement system into a stratum, wherein the injection amount of the compound control and displacement system is 20-50% of the volume of pores of the stratum. By means of the heterogeneous compound control and displacement system based on the low-elasticity microballoons, the low-elasticity microballoons can be moved to the deep part of an oil reservoir, the swept volume is increased, the oil-water interface tension of the compound control and displacement system can reach 10<-3> mN / m, and the recovery efficiency of a high-temperature high-salt heterogeneous oil reservoir is greatly increased.

Description

technical field [0001] The invention belongs to the technical field of oilfield profile control and water shutoff in the field of petroleum exploitation, and in particular relates to a low-elasticity microsphere used for control and displacement, a heterogeneous composite control-displacement system containing the low-elasticity microsphere and a The control and drive method of the composite control and drive system is adopted. Background technique [0002] At present, most of the old oilfields in eastern my country have entered the development stage with high water cut and high recovery degree, and the conflicts between layers and planes are very prominent. There are large water-injection pores, high-permeability strips and serious deficits in many oil-water spaces. For late-stage reservoirs with high water cut, due to the existence of obvious high-permeability water-washed layers, the heterogeneity of the oil layer makes it easy for the injected polymer to break into the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/508C09K8/516C09K8/588E21B43/22C08F220/56C08F220/58C08F222/38
CPCC08F220/56C09K8/5083C09K8/516C09K8/588E21B43/16C08F220/585C08F222/385
Inventor 康万利杨红斌路遥于泱李哲
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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