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Polymer microsphere deep profile control and flooding injection particle size selection method

A microsphere particle size and polymer technology, which is applied in earthwork drilling, wellbore/well components, production fluids, etc., can solve the problem of oil sweeping, failure to meet ultimate recovery requirements, poor multi-round effects, etc. question

Inactive Publication Date: 2019-08-06
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The traditional profile control technology has a small plugging radius, limited plugging strength, short effective period of production stimulation, and the effect of multiple rounds is getting worse. The remaining oil near the well has been completely wiped out, which cannot meet the requirements of enhanced ultimate recovery.

Method used

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  • Polymer microsphere deep profile control and flooding injection particle size selection method
  • Polymer microsphere deep profile control and flooding injection particle size selection method
  • Polymer microsphere deep profile control and flooding injection particle size selection method

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Embodiment Construction

[0039] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0040] see figure 1 , the embodiment of the present invention provides a method for selecting the particle size of polymer microsphere deep control injection, which specifically includes the following steps:

[0041] Step 201, in the present invention, according to claim 1, evaluate the expansion performance of polymer microspheres in simulated formation water by laser particle size distribution analyzer and scanning electron microscope, and establish the expansion and agglomeration of polymer microspheres under different temperature and salinity conditions Finally, the average particle size change multiple relationship chart is used to evaluate the physical and chemical performance parameters of the microspheres, which provides a basis for the design of injection parameters.

[0042] Polymer microspheres can absorb water and swell, and the a...

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Abstract

The invention discloses a polymer microsphere deep profile control and flooding injection particle size selection method. The polymer microsphere deep profile control and flooding injection particle size selection method comprises the following steps: 1, an average particle size change multiple relationship chart after polymer microspheres are expanded and agglomerated under conditions of different temperatures and mineralization degrees is established; 2, an optimal particle size matching factor is introduced; 3, calculation is conducted according to the optimal particle size matching factorof polymer microspheres, and the particle size of the polymer microspheres required by a field test is determined; and 4, according to the determined particle size of the polymer microspheres, on-lineinjection of the polymer microspheres is conducted, the daily injection amount of a water injection well is not changed, and the profile control and flooding effect of the polymer microspheres is evaluated through the block daily oil yield and a water content change curve. Polymer microsphere deep profile control and flooding injection particle size selection is determined by simulating the profile control and flooding process of the polymer microspheres in porous media under laboratory conditions.

Description

technical field [0001] The invention relates to the technical field of water injection development in oilfields, in particular to a method for selecting particle diameters of polymer microspheres for deep control and flooding injection. Background technique [0002] With the deepening of oilfield development, the heterogeneity of reservoirs becomes more and more serious, which often causes the injected water to rush along the high permeability layer, the degree of control of artificial water flooding is low, the interference between layers and layers is serious, and the remaining oil is highly dispersed, which greatly reduces the Therefore, deep water flooding is an important method to enhance oil recovery by plugging high-permeability layers, increasing the swept volume of injected water, and starting residual oil. [0003] The traditional profile control technology has a small plugging radius, limited plugging strength, short effective period of production stimulation, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B33/13E21B43/20G06F17/18
CPCE21B33/13E21B43/20E21B49/00G06F17/18Y02A10/40
Inventor 易萍周志平何治武贾玉琴周广卿薛芳芳马波程辰
Owner PETROCHINA CO LTD
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