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Displacement method and fracturing method for improving fracture support profile through intra-segment multi-cluster fracturing

A fracturing and profiling technology, used in earth-moving drilling, fluid production, wellbore/well components, etc., can solve the problems of decreased conductivity, failure to point out, affecting the effect after fracturing, etc., so as to improve the overall conductivity, Simple and convenient operation, improve the effect of support section

Pending Publication Date: 2022-03-15
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

This document clarified the adverse effect of over-replacement on gas production, but did not point out how to solve the problem of over-replacement
[0009] Therefore, there are two problems in adopting pumped bridge plug fracturing technology for multi-cluster fracturing in shale oil and gas and tight sandstone oil and gas reservoirs. , while the volume of other clusters is small; the second is the problem of over-displacement after fracturing, so that the proppant at the entrance of the first cluster of fractures in the heel is pushed into the interior of the fracture, and there is no proppant support in the fracture opening, and the conductivity is greatly reduced, which affects the post-fracture effect

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  • Displacement method and fracturing method for improving fracture support profile through intra-segment multi-cluster fracturing

Examples

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Embodiment 1

[0077] Well X is a sidetracked horizontal well with an inclination depth of 3336m, a vertical depth of 2233.68m and a horizontal section length of 966.32m. Well drilling and completion The casing with a wall thickness of 12.34mm is completed, and the internal pressure of the casing is 117.3MPa. The well drilled a total of 301m / 22 layers of different levels of oil and gas shows. It is comprehensively predicted that the pressure coefficient of the Silurian Longmaxi Formation-Upper Ordovician Wufeng Formation is 1.25-1.40, and the formation temperature in the middle of the reservoir is about 81°C. The minimum porosity of the reservoir in this well is 1.22%, the maximum is 4.15%, and the average value is 2.83%. The minimum permeability is 0.004md, the maximum is 309.93md, and the average value is 16.139md. The minimum clay mineral content is 15%, the maximum is 70%, and the average value is 45.1%. The brittle mineral content is 21% minimum, 81% maximum, 48.7% average, mainly q...

Embodiment 2

[0103] Well Y is a horizontal well with an inclined depth of 3189m, a vertical depth of 2127m and a horizontal section length of 1255.43m. Well drilling and completion The casing with a wall thickness of 12.34mm is completed, and the internal pressure of the casing is 117.3MPa. The well drilled a total of 279m / 17 layers of oil and gas shows of different grades. It is comprehensively predicted that the pressure coefficient of the Silurian Longmaxi Formation-Upper Ordovician Wufeng Formation is 1.25-1.40, and the formation temperature in the middle of the reservoir is about 78°C. The reservoir porosity of this well is minimum 1.02%, maximum 3.87%, average 2.63%; permeability minimum 0.003md, maximum 279.93md, average 14.22md. The average value of clay minerals is 47.3%. The average content of brittle minerals is 45.7%, mainly quartz, accounting for 30.4%, followed by feldspar 7.6%, and calcite 8.8%.

[0104] The specific implementation process of the well is as follows:

...

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Abstract

The invention discloses a displacement method and a fracturing method for improving a fracture support profile through intra-segment multi-cluster fracturing, and aims to solve the problem that over-displacement in a pumping bridge plug fracturing process is difficult to avoid, soluble temporary plugging balls are injected in the stage of displacing high-viscosity fracturing fluid, the operation is simple and convenient, and the fracture support profile can not be blocked even if over-displacement occurs. And meanwhile, the over-displacement phenomenon of the first cluster of cracks close to the heel can be avoided, the overall supporting section of the multiple clusters of cracks can be improved, the overall flow conductivity and the post-fracturing effect can be improved, and a very good solution is provided for solving the over-displacement problem existing in the pumping bridge plug fracturing technology.

Description

technical field [0001] The invention belongs to the field of fracturing, in particular to the technical field of fracturing reconstruction of shale oil and gas and tight sandstone oil and gas reservoirs, and in particular relates to a new method applicable to the fracturing and replacement process of shale oil and gas and tight sandstone oil and gas reservoirs. Background technique [0002] At present, shale oil and gas wells and tight sandstone oil and gas wells are mostly completed with casing, and the production stimulation method mainly relies on multi-cluster fracturing in the section. Generally, each section of shale oil and gas is perforated with 3 to 6 clusters, or even more than 8 clusters. There are 2 to 3 clusters of oil and gas in tight sandstone, and the number of clusters in foreign countries is more than that in China. Various fracture monitoring data show that when there are multiple clusters of perforation in the section, the first cluster of fractures near ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B33/13E21B43/27E21B43/267
CPCE21B43/261E21B43/26E21B43/267
Inventor 蒋廷学吴春方刘建坤李双明许国庆刘世华
Owner CHINA PETROLEUM & CHEM CORP
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