Steam flooding starting method for super-heavy oil horizontal wells
A technology for horizontal wells and ultra-heavy oil, applied in the field of steam flooding, can solve problems such as wellbore and reservoir damage, unfavorable effective exploitation of ultra-heavy oil reservoirs, etc., achieve high oil-steam ratio, avoid inter-well cracks, expand Effect of heating range
Inactive Publication Date: 2017-04-26
PETROCHINA CO LTD
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Problems solved by technology
[0003] However, in this way, it is easy to cause damage to the completed wellbore and reservoir, and for shallow ultra-heavy oil (<200m) reservoirs, it is easy to cause lateral or vertical micro-fractures in the near-wellbore area during steam injection, It is not conducive to the effective recovery of ultra-heavy oil reservoirs in the later stage
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Embodiment
[0047] This embodiment provides a steam flooding start-up method for a super heavy oil horizontal well.
[0048] This embodiment takes a certain oil reservoir block in Xinjiang Oilfield as the research object. The oil reservoir is a shallow ultra-heavy oil reservoir with a burial depth of 160m, an average formation pressure of 1.5MPa, and a formation temperature of 18.0°C; m; porosity 32.2%, reservoir permeability 3097mD; average crude oil viscosity at 50°C 22000mPa·s; oil saturation 77.0%.
[0049] Deploying steam flooding horizontal well groups at the bottom of the reservoir can be done according to figure 1 The described well pattern structure is deployed, the production well 12 is deployed at the bottom of the super heavy oil reservoir, and the steam injection well 11 is deployed above the middle of two adjacent production wells. When deploying the well pattern, the number of horizontal wells can be according to It depends on the actual situation of the reservoir: for a r...
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The invention provides a steam flooding starting method for super-heavy oil horizontal wells. The method comprises the steps of screening out a super-heavy oil reservoir, and deploying production wells at the bottom of the super-heavy oil reservoir; deploying a steam injection well above a position between the adjacent production wells, wherein both the production wells and the steam injection well are horizontal wells; injecting steam into the horizontal wells to carry out single-well cyclic preheating until a stable heat field is formed at a horizontal near-wellbore zone; preheating the horizontal wells in steam huff-puff manner until a stable heat field is formed between the steam injection wells and the production wells; continuously injecting steam to the steam injection wells, and carrying out single-well cyclic preheating on the production wells to finish steam flooding starting for super-heavy oil horizontal wells. Compared with conventional single huff-puff preheating mode, the method according to the technical scheme provided herein provides greatly shortened preheating time, reduced operation cost of preheating and increased post-conversion yield of crude oil, and has very high economic benefit.
Description
technical field [0001] The invention relates to a steam flooding start-up method for an ultra-heavy oil horizontal well, and belongs to the technical field of oil recovery in heavy oil fields. Background technique [0002] Super-heavy crude oil has high viscosity, and the viscosity of degassed crude oil is greater than 50000mPa·s at the reservoir temperature. This type of oil reservoir is generally produced by steam huff and puff. Huff and puff preheating is the main method to promote connectivity between wells before steam flooding. During the huff and puff process, steam is used as the heat source, and heat transfer and heat convection mechanisms are used. During multiple rounds of huff and puff, the heat carried by steam injection gradually expands the heating range of the reservoir until The temperature field between injection and production wells (well spacing 30m) rises to 75-80°C, the viscosity of crude oil drops below 20,000mPa·s, the flow resistance decreases, and i...
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Login to View More IPC IPC(8): E21B43/24E21B43/30
CPCE21B43/24E21B43/305
Inventor 周游刘彤张忠义李秀峦席长丰杜宣齐宗耀
Owner PETROCHINA CO LTD