Multi-layer small sand body comprehensive fracturing method for sedimentary microfacies of underwater shunt channel
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A technology for depositing microfacies and sand bodies, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., and can solve problems such as poor fracturing effects
Pending Publication Date: 2022-05-10
CHINA PETROLEUM & CHEM CORP +1
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[0006] The purpose of the present invention is to provide a comprehensive fracturing method for multi-layer small sand bodies aimed at the sedimentary microfa
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Embodiment 1
[0029] The comprehensive fracturing method for multi-layer small sand bodies in this embodiment aimed at the sedimentary microfacies of underwater distributary channels is aimed at Well An 3003, and includes the following steps:
[0030] (1) Identify the characteristics of the target small sandbody gas reservoir
[0031] The buried depth of the target layer is 3700-3900m. The reservoir temperature is 140-150°C. On the plane, the oil and gas-bearing area is 0.5km 2 . Natural gas reserves 0.4×10 8 m 3 , condensate reserves 0.4×10 4 t. The number of sand body layers is: 3 layers; the thickness of single layer sand body is 5m, 10m, 15m.
[0032] Rock compactness: compressive strength is 300Mpa, elastic modulus is 50Gpa, Poisson's ratio is 0.2, rock density is 2.7g / cm 3 .
[0034] Logging parameters: resistivity 80Ω·m, acoustic time difference 185μs / m.
[...
Embodiment 2
[0059] The comprehensive fracturing method for multi-layer small sand bodies in this embodiment aimed at the sedimentary microfacies of underwater distributary channels, for Well Xia 13, includes the following steps:
[0060] (1) The well type of Well Xia 13 is a vertical well, the fractured layer is located in the same layer of sand body, and there are 2-4 layers of perforation intervals, and the perforation intervals are relatively close to each other, with a distance of 2-3m. The rocks in this layer have micro-fractures observed by cores , the sedimentary microfacies of sand body is underwater distributary channel sedimentary microfacies.
[0061] (2) The fracturing pumping program of Well Xia 13 is shown in Table 2.
[0062] Table 2 Fracturing pumping program of Well Xia 13
[0063]
[0064]
[0065] In Table 2, the composition of the cross-linking solution is the same as in Example 1. The difference between the original gum solution and the cross-linking solution ...
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Abstract
The invention belongs to the field of oil and gas reservoir exploitation, and particularly relates to a multi-layer small sand body comprehensive fracturing method for sedimentary microfacies of an underwater shunt channel. The method comprises the following steps: aiming at a small sand body tight gas reservoir of which the sedimentary microfacies is an underwater shunting river channel and the longitudinal target layers are more than two layers, according to the sand body positions of the target layers, performing first fracturing construction, changing the heterogeneous difference between the target layers, then performing fracturing construction for at least one time, and performing fracturing transformation on the target layers. The small sand body tight gas reservoir of the sedimentary microfacies of the underwater shunt channel has the characteristics of multiple layers, compact lithology and poor physical property, and the conventional fracturing is easy to cause that fracturing fluid only enters a loose stratum, so that a small sand body layer is under-transformed. According to the method, the heterogeneous difference between the target layers is changed through at least two times of fracturing transformation according to the positions of the sand bodies where the target layers are located, then the fracturing effect on all the target layers is improved, and the gas production degree of the oil reservoirs can be improved.
Description
technical field [0001] The invention belongs to the field of oil and gas reservoir exploitation, and in particular relates to a comprehensive fracturing method for multi-layer small sand bodies aimed at sedimentary microfacies of underwater distributary channels. Background technique [0002] Henan Oilfield is rich in natural gas resources, but natural gas reservoirs generally have the characteristics of low permeability, early water breakthrough period of gas wells, and low production after perforation, which seriously restrict the effective development of such reservoirs. The natural gas geological reserves of deep condensate gas reservoirs in Anpeng Oilfield are 5.67×10 8 m 3 , located in Anpeng Township, Tongbai County, Henan Province, with condensate oil geological reserves of 11.7×10 4 t, belongs to small gas condensate reservoir. [0003] The reservoirs are obviously controlled by basin margin faults, which constitute the characteristics of multi-source convergence...
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