Broken and soft low-permeability coal bed horizontal well staged fracturing technology

A technology for staged fracturing and horizontal wells, applied in wellbore/well components, production fluids, earthwork drilling and production, etc., can solve problems such as low economic output value and affecting production efficiency, and achieve increased angle, increased Effect of Crack Complexity

Inactive Publication Date: 2015-08-26
山西蓝焰煤层气集团有限责任公司 +2
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Problems solved by technology

The geological factors affecting coal seam production mainly include: coal reservoir physical properties (reservoir porosity, permeability, water saturation), structural stress conditions, and coal bed methane resources (...

Method used

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  • Broken and soft low-permeability coal bed horizontal well staged fracturing technology

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Embodiment Construction

[0017] For coal reservoirs with large burial depth, high proportion of broken coal and poor reservoir physical properties, the staged fracturing process of "sealing one section and pressing one section" described in the present invention is required. Fracturing design, equipment selection, and finally fracturing construction. Among them, the fracturing design first needs to determine the net pressure range and segmental distance.

[0018] (1) Determine the net pressure range

[0019] According to the large horizontal stress difference coefficient, hot-spur double-wing fractures are easy to form under low net pressure. Therefore, it is necessary to determine a reasonable net pressure to open weak surface fractures to form complex fractures, increase the effective volume of stimulation, and design proppant and fracturing fluid. Amount of preparation.

[0020] P net =P 施工 +P 液柱 -P 摩 -

[0021] Among them, P net is the net pressure;

[0022] P 施工 Construction pressure ...

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Abstract

The invention belongs to the coal-bed gas well fracturing motivation technology, and particularly relates to a broken and soft low-permeability coal bed horizontal well staged fracturing technology. The broken and soft low-permeability coal bed horizontal well staged fracturing technology aims at improving the broken and soft low-permeability coal bed mining benefits and adopts the fracturing technology mode that sealing and fracturing are carried out section by section. The previous sealed section produces induction stress for the fracture initiation of the rear fracturing section. By optimizing the sectioning distance, the maximum horizontal principal stress difference caused by coal reservoir burial depth, heterogeneity and aeolotropism is improved, the manual fracture initiation direction and natural fracture initiation included angle are enlarged, coal bodies can form joint nets more easily, natural fractures are communicated, and the fracture complexity degree is improved; different kinds of pressure are distributed for different sections, the contact area between the fracture wall face and the coal matrix face is enlarged, a complex crossed fracture network system is built finally, the seepage distance from the coal matrix in any direction to the fracture is the shortest, and the low-permeability coal reservoir can achieve economic output.

Description

technical field [0001] The invention belongs to the fracturing excitation technology of coalbed gas wells, and in particular relates to a staged fracturing technology for horizontal wells in broken soft low-permeability coal seams. Background technique [0002] my country's coal reservoirs are affected by geological structures to a large extent. Taking the gas-enriched area in the southern Qinshui Basin as an example, the degree of influence by geological structures gradually increases from south to north, and the characteristics of coal bodies are buried from south to north. The proportion of deep and crushed coal gradually increases, and the physical properties of coal reservoirs show that the matrix porosity, permeability and complexity gradually deteriorate, and the characteristics of heterogeneity and anisotropy are significant. The geological factors affecting coal seam production mainly include: coal reservoir physical properties (reservoir porosity, permeability, wate...

Claims

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Application Information

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IPC IPC(8): E21B43/26
CPCE21B43/26
Inventor 王保玉赵小山王军贾召李军军郭文水李建良
Owner 山西蓝焰煤层气集团有限责任公司
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