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Method of hydraulic fracture of subterranean formation

An underground formation and fracturing fluid technology, which is applied in the field of hydraulic fracturing to achieve the effects of improving the effective conductivity, increasing the effective half-length of cracks, and improving the stimulation of oil wells

Inactive Publication Date: 2005-09-21
SCHLUMBERGER TECH LTD BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the amount of polymer recovered from processing usually does not exceed 50% by weight, so there are still limitations

Method used

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  • Method of hydraulic fracture of subterranean formation
  • Method of hydraulic fracture of subterranean formation
  • Method of hydraulic fracture of subterranean formation

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Embodiment Construction

[0036] In many cases, the hydraulic fracturing treatment consists in pumping a proppant-free viscous fluid, or pad (typically, water and some fluid additive that creates a high viscosity) into the well faster than the fluid can enter the formation, so the pressure Rise and fracture the rock, creating artificial fractures and / or widening existing fractures. A proppant such as sand is then added to the fluid to form a mortar that is pumped into the fracture to prevent the fracture from closing when the pumping pressure is released. The proppant transport capability of the base fluid depends on the type of viscosifying additive added to the aqueous matrix.

[0037] Water-based fracturing fluids to which water-soluble polymers have been added to prepare viscosified solutions are widely used in the field of fracturing. Since the late 1950s, more than half of all fracking treatments have been performed with fluids that include guar gum, high molecular weight polysaccharides compose...

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Abstract

This invention relates generally to the art of hydraulic fracturing in subterranean formations and more particularly to a method and means for optimizing fracture conductivity. According to the present invention, the well productivity is increased by sequentially injecting into the wellbore alternate stages of fracturing fluids having a contrast in their ability to transport propping agents to improve proppant placement, or having a contrast in the amount of transported propping agents.

Description

field of invention [0001] The present invention relates generally to the field of hydraulic fracturing in subterranean formations, and more particularly to methods and means for optimizing fracture conductivity. Background of the invention [0002] Hydrocarbons (oil, natural gas, etc.) are obtained from subterranean geological formations (ie, "reservoirs") by drilling wells that penetrate hydrocarbon-bearing formations. This provides partial fluid pathways for hydrocarbons to reach the surface. In order for hydrocarbons to "produce", that is to migrate from the formation into the wellbore (and eventually to the surface), there must be sufficient unimpeded fluid passage from the formation to the wellbore. [0003] Hydraulic fracturing is a primary tool for improving well production by placing or extending the passage from the wellbore to the reservoir. The operation is essentially performed by hydraulically injecting fracturing fluid into a wellbore that penetrates a subter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267
CPCE21B43/267
Inventor 凯文·英格兰
Owner SCHLUMBERGER TECH LTD BV
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