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Oil and gas reservoir fracturing sand-adding method

A technology of oil and gas reservoirs and fracturing, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., which can solve the problem of low utilization rate of fracturing and fracture creation space, affecting post-fracture conductivity, and failure to obtain fracture creation space Effective use of support and other issues to achieve the effects of reducing material costs, optimizing the support section, and optimizing the support effect

Active Publication Date: 2019-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The higher the filling degree of the fracture, the higher the utilization rate of the fracturing space; on the contrary, the lower the utilization rate of the fracturing space, most of the fracturing space cannot be effectively used and supported, which affects the post-fracture conductivity

Method used

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  • Oil and gas reservoir fracturing sand-adding method
  • Oil and gas reservoir fracturing sand-adding method
  • Oil and gas reservoir fracturing sand-adding method

Examples

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Embodiment Construction

[0112] The present invention will be further described through specific examples below. However, it should be understood that the following examples are only used to further illustrate the present invention, but do not limit the present invention.

[0113] Well X is a typical evaluation well for tight gas reservoirs, the fractured interval of the target layer is 3250.7-3261.5m, 10.8m / 1 layer; the wellbore volume is 15m 3 The lithology of the target layer is gray pebble-bearing fine sandstone, with an average porosity of 9.73%, a permeability of 0.259mD, a pressure coefficient of 1.0, and a temperature of 120°C. It is a gas reservoir with low porosity, ultra-low permeability, normal temperature and normal pressure.

[0114] In order to evaluate the gas-bearing property and production capacity of the sand formation in the target layer, the fracturing scheme design and field pilot test of the well were carried out by referring to the process method proposed by the present inventi...

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Abstract

The invention relates to an oil and gas reservoir fracturing sand-adding method which comprises the following steps: respectively adopting different fracturing fluid types in a prepad fluid fracture forming stage and different sand-carrying fluid sand adding stages, using proppants with different densities and particle sizes in a matched manner, optimizing the configuration of the proppants in a whole fracture space, and improving the flow guiding performance of fractures, so as to improve the fracturing effect. According to the invention, construction parameters such as the fracturing fluid displacements of different fracturing construction stages, the liquid amount, the sand-liquid ratio and the like are further optimized in a synergistic manner so as to enable the proppants to be evenlylaid in the whole crack space, the filling degree and the supporting efficiency of the proppants in cracks are improved, the effective flow guiding capacity after pressing is improved, and the problems that the initial yield after pressing is low, the yield is decreased progressively and rapidly, and a stable production period is short are solved.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir hydraulic fracturing stimulation and reformation, in particular to a sand adding method for oil and gas reservoir fracturing. Background technique [0002] The core of hydraulic fracturing technology includes two parts, one is fracturing and fracture creation, and the other is proppant filling and forming propped fractures with a certain conductivity. The longer the supporting fracture length and the higher the effective conductivity of the fracture, the higher the production after fracturing and the slower the production decline rate. [0003] The characteristics of the reservoir itself, the optimal selection of fracturing fluid and proppant, and the optimization of fracturing operation parameters can all affect the effect of sand addition in fracturing. [0004] For example, if the in-situ stress of the reservoir is high, the Young's modulus is large, and the fluid loss is large, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267
Inventor 刘建坤蒋廷学侯磊周林波吴春方吴峙颖左罗
Owner CHINA PETROLEUM & CHEM CORP
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