Inorganic solidifying system for controlling bottom water coning in fracture-cavity karst reservoir, and injection method thereof
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A carbonate reservoir, inorganic solidification technology, applied in the direction of chemical instruments and methods, production fluid, earth drilling and production, etc., can solve the problem that the partition fluid is difficult to adapt, and achieve the effect of changing the flow direction
Active Publication Date: 2011-09-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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However, for high-temperature and high-salt fracture-vuggy carbonate reservoirs, it is very difficult to select the appropriate diaphragm fluid, loca
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Embodiment 1
[0010] Embodiment 1: The composition of the inorganic solidification system is: superfine cement 25.46% (particle diameter is 10~100 μm, density is 2.8~3.2g / cm 3 ), density regulator 19.94%, reinforcing agent 2.97%, suspension dispersant 0.51%, drag reducer 0.38%, retarder 0.13%, skeleton bridging agent 0.21%, the rest is water, and the sum of each component is 100%, Stir evenly to form a density of 1.061g / cm 3 The system has an initial setting time of 5.5h and a compressive strength of 1.5MPa at 130°C.
Embodiment 2
[0011] Embodiment 2: The composition of the inorganic solidification system is: superfine cement 26.47% (particle diameter is 10~100 μ m, density is 2.8~3.2g / cm 3 ), density regulator 17.64%, reinforcing agent 2.21%, suspension dispersant 0.53%, drag reducer 0.40%, retarder 0.13%, skeleton bridging agent 0.22%, the rest is water, and the sum of each component is 100%, Stir evenly to form a density of 1.078g / cm 3 The system has an initial setting time of 7.0h and a compressive strength of 2.2MPa at 130°C.
Embodiment 3
[0012] Embodiment 3: The composition of the inorganic solidification system is: superfine cement 27.81% (particle diameter is 10~100 μm, density is 2.8~3.2g / cm 3 ), density regulator 17.12%, reinforcing agent 3.00%, suspension dispersant 0.51%, drag reducer 0.39%, retarder 0.13%, skeleton bridging agent 0.21%, the rest is water, the sum of each component is 100%, Stir evenly to form a density of 1.100g / cm 3 The system has an initial setting time of 6.0h and a compressive strength of 3.0MPa at 130°C.
[0013] On-site application:
[0014] For the existing A test well, see Table 1 for its basic conditions and Table 2 for its working fluid conditions.
[0015] Table 1 Basic conditions of test wells
[0016] Happening
Well A
Production date
April 1999
Production layer
02yj; C1k
Reservoir section / (m)
5250～5540
[0017] Perforated section / (m)
5260～5540
Reservoir type
Fracture-vuggy carbonate rock
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Abstract
The invention provides an inorganic solidifying system for controlling bottom water coning in a fracture-cavity karst reservoir, and an injection method of the inorganic solidifying system. The inorganic solidifying system comprises ultrafine cement, a density modifying agent, a reinforcing agent, a suspension dispersing agent, a frame bridging agent, a drag reducer, and a retarder. The density of the inorganic solidifying system is 1.06 to 1.09 g/m<3>. The initial setting time of the system under a temperature of 130 DEG C is 5 to 10 hours. The compressive strength of the system is 1.0 to 4.0 Mpa. The injection method is that: first, an inorganic solidification system with a relatively large density is prepared and is injected into a stratum, then an inorganic solidifying system with a relatively small density is prepared and is injected into the stratum, and finally a displacing liquid is injected into the stratum. Because the density of the inorganic solidifying system is between the density of oil in the oil reservoir and the density of salt water in the stratum, the inorganic solidifying system is positioned below the oil reservoir and above the salt water reservoir in the stratum. Therefore, the inorganic solidifying system can be solidified to form a separator near the separating surface between oil and water. Thus, the winding direction of the bottom water is efficiently changed, the bottom water coning is controlled, the oil flooding efficiency of the bottom water is improved, and the fracture-cavity karst reservoir exploitation effect is improved.
Description
Technical field: [0001] The invention relates to an oilfield chemical agent and an injection method thereof, in particular to a chemical system and an injection method for controlling bottom water coning in high-temperature and high-salt fracture-cavity carbonate reservoirs. Background technique: [0002] At present, most of the fracture-cavity bottom water reservoirs are developed by horizontal wells to suppress bottom water coning. However, due to too fast oil production or long development time, the energy in the formation is insufficient, causing the bottom water to advance to the perforation part of the oil well, forming bottom water coning. When the bottom water breaks through, the water cut of the oil well rises, and the bottom water is produced from the high-permeability well section and inhibits the liquid production of the low-permeability well section, resulting in a large amount of remaining oil enriched in the low-permeability section, which is difficult to reco...
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