Placing method of self-simulating lateral-displacement horizontal well of super-low permeability tight reservoir
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A technology for tight oil reservoirs and horizontal wells, applied in wellbore/well components, earthwork drilling and production, production fluids, etc., to reduce the risk of fractured water flooding, avoid early water breakthrough, and improve the level of energy supplementation
Active Publication Date: 2016-01-13
PETROCHINA CO LTD
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[0004] In order to overcome the shortcomings of the above-mentioned prior art, the present invention proposes a lateral displacement method for ultra-low permeability tight oil reservoirs that combines horizontal well volume fracturing and lateral displacement on the basis of clear research on the dominant direction of natural fractures in reservoirs. The method of displacing hor...
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Embodiment 1
[0050]A method for arranging horizontal wells for lateral displacement of proposed wells in tight oil reservoirs with ultra-low permeability, which is carried out according to the following steps:
[0051] Follow the steps below:
[0052] 1) First, select the horizontal well pattern deployment area and determine the main contribution interval;
[0053] 2) Determine the positions of horizontal wells, water injection wells and artificial fractures: No water injection wells are set between two horizontal wells, and water injection wells are arranged between two sections of artificial fractures;
[0054] 3) Determine the direction of the horizontal well row;
[0055] 4) Determine the well spacing between horizontal wells;
[0056] 5) Determine the row spacing of horizontal wells;
[0057] 6), determine the length of the horizontal well; the length of the horizontal well is twice the row spacing determined in step 4);
[0058] 7) Determine the offset of the water injection well...
Embodiment 2
[0081] Such as figure 1 , 2 , 3, 4, and 5, fully considering the characteristics of ultra-low permeability tight oil reservoirs such as multi-reservoir composite superposition, poor reservoir physical properties, strong heterogeneity, and natural fractures, through comprehensive geological research and Research on the non-linear seepage mechanism of ultra-low permeability tight oil reservoirs, summarize and analyze the implementation effect of different well patterns of horizontal wells over the years, and innovatively propose that ultra-low permeability tight oil reservoirs use horizontal wells to simulate the linear injection and production wells of "one-stage injection and two-stage production" in this well The grid is the well layout method of the basic well pattern.
[0082] figure 1 It shows the schematic diagram of the injection-production basic well pattern and components of the "one-stage injection and two-stage production" proposed horizontal well, 1—horizontal wel...
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Abstract
The invention provides a placing method of a self-simulating lateral-displacement horizontal well of a super-low permeability tight reservoir. The placing method comprises the following specific steps: determining a main force construction layer section; determining the positions of horizontal wells, water injection wells and artificial fractures; determining a well row direction of the horizontal wells; determining a well spacing between the horizontal wells; determining a distance between the rows of the horizontal wells; determining the length of each horizontal well; determining an offset distance of each water injection well; determining a length of each artificial fracture of each water injection well; and injecting water; scattered water injection in the past is changed into linear water injection, and in case of the same water injection amount, a water injection pressure is reduced so that secondary opening of a natural fracture generated in the water injection process can be avoided and a risk of fractured water flooding can be reduced; elastic solution gas drive in a region between the artificial fractures is converted to water drive and a fracture dominant direction of a local region is kept consistent so that early-phase water breakthrough can be avoided and an energy supplementing level can be increased. Row water injection displacement is formed through appropriate fracturing of the directional water injection wells, leading to the advantages that layered water injection can be realized and maximum draw-on in a longitudinal direction can be realized, compared with taking the horizontal wells as the water injection wells.
Description
technical field [0001] The invention relates to the field of oilfield development, in particular to a method for arranging horizontal wells for lateral displacement of proposed wells in tight oil reservoirs with ultra-low permeability. Background technique [0002] With the increasingly prominent contradiction between the world's oil supply and demand and the gradual shortage of high-quality oil resources, the development of ultra-low permeability tight oil resources (ground air permeability less than 1.0mD) has become a new topic for the development of my country's oil industry. Practice has shown that horizontal wells are an effective way to develop this type of reservoir. In foreign tight oil reservoirs, the formation pressure coefficient is high (the formation pressure coefficient is greater than 1.2), and the viscosity of the formation crude oil is low. Basically, long horizontal wells are used for depletion production. low ratio (5%-8%); domestic tight oil is similar t...
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