Fracturing technology for improving effective support of shale fracturing complex fracture network

A complex fracture and fracturing technology, applied in the field of oil and gas stimulation and reconstruction, can solve the problem of not being able to play a good supporting role, and achieve the effects of strong migration capacity, reduced water consumption, and improved effective support

Inactive Publication Date: 2020-04-28
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the proppant used in shale gas fracturing is mainly used to support artificial main fractures, but it cannot play a good supporting role for micro-fractures and secondary fracture networks far away from the main hydraulic fractures. However, shale fracturing produces However, the development of micro-fractures and secondary fracture networks is extremely rich. If the p

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  • Fracturing technology for improving effective support of shale fracturing complex fracture network

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Example Embodiment

[0028] Example 1

[0029] The invention discloses a fracturing process for improving the effective support of a complex fracture network in shale fracturing. According to the characteristics of different reservoirs, the process preferably adopts the sand fracturing process of prefluid + sand carrying fluid + displacement fluid. The section liquid volume is preferably 1800m 3 Among them, the volume percentage of the sand-carrying liquid is 88%, the volume percentage of the front fluid is 6%, and the volume percentage of the displacement fluid is 6%. The amount of sand added per meter of the horizontal section of the shale layer is 1.7 tons. It specifically includes the following steps:

[0030] (1) Well cleaning: Use clean water or well cleaning fluid to circulate the well, and use a well-draining gauge to clear the well.

[0031] (2) Perforation: It is transported to the well by a cable belt perforating gun, and the perforation is carried out to create a channel in the reservoir.

...

Example Embodiment

[0038] Example 2

[0039] The invention discloses a fracturing process for improving the effective support of a complex fracture network in shale fracturing. According to the characteristics of different reservoirs, the process preferably adopts the sand fracturing process of prefluid + sand carrying fluid + displacement fluid. The section liquid volume is preferably 1800m 3 , Wherein the volume percentage of the sand-carrying liquid is 92%, the volume percentage of the front fluid is 4%, and the volume percentage of the displacement fluid is 4%. The amount of sand added per meter of the horizontal section of the shale layer is 2.0 tons. It specifically includes the following steps:

[0040] (1) Well cleaning: Use clean water or well cleaning fluid to circulate the well, and use a well-draining gauge to clear the well.

[0041] (2) Perforation: It is transported to the well by a cable belt perforating gun, and the perforation is carried out to create a channel in the reservoir.

[0...

Example Embodiment

[0048] Example 3

[0049] The invention discloses a fracturing process for improving the effective support of a complex fracture network in shale fracturing. According to the characteristics of different reservoirs, the process preferably adopts the sand fracturing process of prefluid + sand carrying fluid + displacement fluid. The section liquid volume is preferably 1800m 3 , Wherein the volume percentage of the sand-carrying liquid is 90%, the volume percentage of the front fluid is 5%, and the volume percentage of the displacement fluid is 5%. The amount of sand added per meter of the horizontal section of the shale layer is 1.85 tons. It specifically includes the following steps:

[0050] (1) Well cleaning: Use clean water or well cleaning fluid to circulate the well, and use a well-draining gauge to clear the well.

[0051] (2) Perforation: It is transported to the well by a cable belt perforating gun, and the perforation is carried out to create a channel in the reservoir.

[...

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Abstract

The invention discloses a fracturing technology for improving effective support of a shale fracturing complex fracture network. The fracturing technology comprises the following steps that (1) well cleanup is conducted; (2) perforation is conducted; (3) fracturing treatment is conducted, specifically, a suspension fluid formed by mixing a prepad fluid with 140-300 mesh quartz sand is pumped at thedisplacement of 10-12 m<3>/min firstly, then a sand-carrying fluid is pumped at the displacement of 10-12 m<3>/min, 70-140 mesh quartz sand is adopted as an early-period proppant of the sand-carryingfluid, 40-70 mesh ceramsite is adopted as a later-period proppant of the sand-carrying fluid, finally, a displacing fluid is pumped for displacement, and pumping is stopped after displacement; (4) segment treatment is conducted; and (5) the steps (2) and (3) are repeated, and next segment of fracturing operation is completed. According to the fracturing technology, a microfracture and a secondaryfracture network can be effectively supported, meanwhile, a fracturing major fracture and a branched fracture are also supported advantageously, finally, effective support of the shale complex fracture network is improved overall, the yield of shale gas is increased, and the successive decreasing speed of a shale gas well is decreased.

Description

technical field [0001] The invention belongs to the technical field of oil and gas stimulation and transformation, and in particular relates to a fracturing process for improving the effective support of complex fracture networks in shale fracturing. Background technique [0002] "Formation of complex fracture networks" is the main goal of shale gas stimulation and stimulation. Shale fracturing usually uses low-viscosity fluids to stimulate high-brittle shale reservoirs. Large displacement is beneficial to increase net pressure, and effective fracture sealing is adopted. The method causes the opening or turning of multiple fractures, and finally forms a complex fracture network system of "main fractures + branch fractures + micro-fractures". With the increasing understanding of shale fracturing, a secondary fracture network with a large number of branch fractures and micro-fractures will be generated in shale fracturing. These secondary fracture networks absorb up to 70%-90...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/267E21B43/116
CPCE21B43/116E21B43/26E21B43/267
Inventor 龚蔚袁灿明尹丛彬何乐周瀚
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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