Overall blockage adjusting edge-bottom water heavy oil reservoir water invasion and gas fleeing method
A technology for heavy oil reservoirs and edge and bottom water, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of serious water invasion and steam channeling, affecting the development effect, and affecting the development effect of steam huff and puff , to achieve the effect of slowing down water intrusion and steam channeling and improving the development effect
Active Publication Date: 2019-08-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
[0003] At present, steam huff and puff production accounts for more than 70% of heavy oil production, but for heavy oil reservoirs containing edge and bottom water, with the increase of steam huff and puff rounds, the formation energy in heavy oil reservoirs gradually decreases. In the case of no external energy supplement Under normal conditions, the pressure deficit will occur at the bottom of the huff and puff well, and the edge and bottom water will invade the inside of the oil layer under the action of the pressure difference, resulting in water flooding in the oil layer, and the water cut will rise rapidly, which will affect the development effect; increase, steam channeling between huff and puff wells will also affect the development effect of steam huff and puff
Therefore, after multiple rounds of steam huff and puff in heavy oil reservoirs with edge and bottom water, water invasion and steam channeling are serious, and the effect of steam huff and puff becomes poor.
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Embodiment 1
[0028] The method for overall adjusting and blocking water invasion and steam channeling of heavy oil reservoirs with edge and bottom water comprises the following steps:
[0029] (1) Reservoir selection: A block is a heavy oil reservoir with edge and bottom water, with an oil-bearing area of 6.0km 2 , the viscosity of surface degassed crude oil at 50°C is 3983mPa·s, the buried depth of the reservoir is 940m, the effective thickness is 7m, the initial oil saturation is 0.65, the permeability is 2520mD, and the ratio of water body volume to oil layer volume is 350;
[0030] (2) Distribution of huff and puff wells: Drill huff and puff wells in the oil layer according to the arrangement of wells in a row; the huff and puff wells are horizontal wells; the number of well rows is determined according to the reservoir area, and three columns of huff and puff well rows are set in the oil layer, as shown in Fig. figure 1 As shown, the well row closest to the water body is the first-l...
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The invention belongs to the technical field of oil-gas field development and particularly relates to an overall blockage adjusting edge-bottom water heavy oil reservoir water invasion and gas fleeingmethod. The overall blockage adjusting edge-bottom water heavy oil reservoir water invasion and gas fleeing method includes the following steps that firstly, oil deposit selection is conducted; secondly, huff and puff well arranging is conducted; thirdly, steam huff and puff development is conducted; and fourthly, overall blockage adjustment is conducted. By means of the method, an overall blockage adjusting technology is adopted, a high-strength nitrogen foam system and a nitrogen foam system are injected correspondingly through well arrays at different positions in an oil reservoir, effective blockage walls are formed at different positions away from edge-bottom water, and water invasion and gas fleeing are relieved.
Description
technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a method for integrally regulating and blocking water invasion and steam channeling of heavy oil reservoirs with edge and bottom water. Background technique [0002] Heavy oil refers to the crude oil with a viscosity greater than 50mPa·s under oil reservoir conditions or a degassed crude oil with a viscosity greater than 100mPa·s at the reservoir temperature and a relative density greater than 0.92. The predicted resources of heavy oil in China are about 198×10 8 t. With the increasing difficulty of exploration and development of conventional thin oil reservoirs, further increasing heavy oil production is an important guarantee for maintaining the stability of China's oil production and maintaining national energy security. [0003] At present, steam huff and puff production accounts for more than 70% of heavy oil production, but for heavy oil ...
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IPC IPC(8): E21B43/24E21B43/22
CPCE21B43/24E21B43/166
Inventor 鹿腾李兆敏李宾飞李松岩
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)