A shale gas direct exploration well fracturing method

Abstract

The invention provides a fracturing method of a shale gas straight exploratory well. The fracturing method includes the steps of compressibility evaluation, perforation scheme optimization, fracturingconstruction parameter optimization, fracturing equipment power and equipment selection and quantity determination, major fracture static pressure optimization control and fracturing construction andpost-fracturing flowback. The fracturing method of the shale gas straight exploratory well solves the problems that a fracturing method of shale gas of a horizontal exploratory well can not be applied to fracturing of the straight exploratory well effectively and the effect of fracturing of the shale gas straight exploratory well is not ideal. The fracturing method of the shale gas straight exploratory well can fracture a reservoir effectively, further improves the volume of reservoir reforming, and excavates potential productivity of the reservoir sufficiently.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration and development, and in particular relates to a fracturing method for a shale gas direct exploration well. Background technique [0002] So far, commercial breakthroughs have been made mainly in Longmaxi shale gas with a relatively high pressure coefficient in marine facies. Others, even in marine Longmaxi but normal pressure formations, such as Pengshui shale gas, have not yet achieved commercial breakthroughs . In particular, some new fields, such as continental shale gas and marine-continental shale gas, have not made real breakthroughs in China. [0003] Due to the high risk of shale mining, they dare not rashly drill horizontal wells for large-scale fracturing to evaluate productivity. In view of this, there are still a large number of shale gas direct exploration wells in some units such as the Oil and Gas Survey Center of the China Geological Survey Bureau of the Ministry ...

AI Technical Summary

Problems solved by technology

Therefore, due to the matching of displacement and liquid volume, the stimulation intensity of horizontal wells is weaker than that of vertical wells.

[0007] 3) Just because the fracturing of direct exploration wells adopts the same high displacement as horizontal wells, the fracture height will be out of control, and it is difficult to form complex fracture shapes

High displacement, fast accumulation of pressure in the bottom hole and fractures, easy to extend in the direction of the main fracture, while other branch fractures or micro-fractures are difficult to obtain effective extension and proppant laying

[0008] 4) The above three points are different, resulting in large differences in fracture reconstruction strength, fracture length, fracture height and fracture complexity.

In other words, the number of equipment and power requirements for direct exploration well fracturing may not be as large as currently designed

Images