Multi-slug combined type deep profile control and flooding method, equipment and system
A multi-slug and combined technology, applied in earthwork drilling, wellbore/well components, design optimization/simulation, etc., can solve problems such as inability to increase oil recovery, inability to significantly reduce oil-water interfacial tension, and inability to solve problems
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Embodiment 1
[0293] Example 1. Three-layer heterogeneous cemented core core flooding experiment in oil washing system
[0294] Experimental conditions:
[0295] Three-layer heterogeneous cemented core model: the permeability is 1061md / 496md / 380md respectively.
[0296] Experimental oil: dehydrated crude oil from Block S67 of Liaohe Oilfield.
[0297] Experimental water: water injected from block S67 of Liaohe Oilfield, with a salinity of 3112.6mg / L.
[0298] Oil displacement system: Use on-site injected water and oil displacement agent to prepare an oil displacement system with a concentration of 0.2%.
[0299] Experimental temperature: 60°C.
[0300] Experimental steps:
[0301] (1) Evacuation and saturation: weigh the weight of the core model, evacuate the core model for 8-10 hours, inject water into the site to saturate the core, weigh the core model weight again, and measure the pore volume in the core;
[0302] (2) Connect the core to the displacement process, and inject on-site ...
Embodiment 2
[0310] This example provides an evaluation method for an elastic creep particle-based deep control and displacement system and a viscoelastic colloid-based deep control and displacement system, which includes the following steps:
[0311] 1. Single-dose optimization for control and flooding system
[0312] (1) Screening of elastic creep particles
[0313] Evaluate the solid content, pH value, apparent density, particle size coincidence rate, and impurity content of different products as basic parameters, select qualified products, and evaluate the performance parameters of water absorption multiple, volume expansion multiple, compressive strength, and elastic factor. Inject water into the sewage to absorb water and swell for 24 hours. Products with strong water absorption capacity, high expansion multiple, good creep and high compressive strength are preferred.
[0314] (2) Viscoelastic colloid single agent screening
[0315] Evaluate the pH value, initial apparent viscosity...
Embodiment 3
[0332] The average porosity of the H2-7-13 test area is 23%, and the average permeability is 163×10 -3 μm 2 , the variation coefficient of plane permeability is 0.72, the average variation coefficient of vertical permeability within layers is 0.89, and the variation coefficient of interlayer permeability is 1.09. The formation temperature is 58°C. According to the scheme design of 4 well groups, according to the slug combined deep control and flooding method and scheme design provided in Example 2, after injection into the production well, the daily fluid production of the test block increased from 69.2t to 125.3t; the daily oil production increased from 1.3t to 14.3t; water content dropped from 98.1% to 88.59%. After the implementation, the accumulative oil increase of 2348t in the block stage has achieved obvious results.
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