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Shale gas horizontal well staged fracturing method and shale gas horizontal well completion method

A technology for staged fracturing and horizontal wells, which is applied in staged fracturing of shale gas horizontal wells and completion of shale gas horizontal wells. The probability of the drill plug being blocked, the low cost and the effect of convenient construction operation

Active Publication Date: 2016-02-24
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Shale gas reservoirs have the characteristics of no obvious gas-water interface, large-area continuous accumulation, low porosity, and low permeability. Generally, there is no natural production capacity. Industrial production capacity must be formed through fracturing engineering, and the initial production is relatively high and declines rapidly. But the post-stabilization time is long

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  • Shale gas horizontal well staged fracturing method and shale gas horizontal well completion method
  • Shale gas horizontal well staged fracturing method and shale gas horizontal well completion method

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with accompanying drawing.

[0022] The method according to the invention is usually performed after cementing. figure 1 It schematically shows the process of fracturing and ball setting of the lower production layer in the well according to the present invention.

[0023] Firstly, a perforating gun (not shown) is lowered into the wellbore 10 into the expected production zone 11 (or the first layer 11 ) to perforate, and the perforation holes 16 are formed on the casing 15 . Typically, the first layer 11 is the lowest producing layer. Perforating guns and perforating operations are well known to those skilled in the art and will not be repeated here. After the perforation is completed, the well is filled with high-pressure fluid for fracturing, and the production layer fractures 12 are formed in the first layer 11 . The number of production layer fractures 12 is usually multiple. Formation exudates...

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Abstract

The invention relates to a shale gas horizontal well staged fracturing method and a shale gas horizontal well completion method. The shale gas horizontal well staged fracturing method comprises that step 1: the lower production layer in the well is perforated and fractured; step 2: the lower production layer is subjected to setting; step 3: the upper production layer in the well is perforated and fractured; step 4: the upper production layer is subjected to setting; the step 3 and the step 4 are repeated until the fracturing construction of the horizontal well is completed. By employing the shale gas horizontal well staged fracturing method, shale gas reservoirs can be effectively reconstructed, and network fractures having effective flow conductivity are formed.

Description

technical field [0001] The invention relates to the field of oil and gas wells, in particular to a staged fracturing method for a shale gas horizontal well. The invention also relates to a shale gas horizontal well completion method including the shale gas horizontal well staged fracturing method. Background technique [0002] Shale gas is an unconventional natural gas resource with great potential in recent years, and has become a hot field of oil and gas exploration and development in the world. Shale gas reservoirs are rich in organic matter and are typical self-generation and self-storage gas reservoirs. Compared with other natural gas reservoirs, natural gas in shale gas reservoirs mainly occurs as free gas and adsorbed gas, and is in-situ saturated and enriched in the micro-nano-scale pores-fractures and mineral particle surfaces of the shale reservoir system. Shale gas reservoirs have the characteristics of no obvious gas-water interface, large-area continuous accum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B7/04
Inventor 蒋廷学苏瑗贾长贵卫然王海涛李双明卞晓冰
Owner CHINA PETROLEUM & CHEM CORP
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