MX2009010321A - Oil well fractuirng fluid. - Google Patents

Abstract

The present invention refers to a fracturing fluid based on hydrocarbons with an aromatic content higher than 40% by weight and paraffinic hydrocarbons and additives for regulating visccosity; said fluid has densities of from about 0.89 and 0.96, and along with the additives improves the viscosity index higher than 140..

Description

FLUID OF FRACTU RATION OF PETROLEUM WELLS FIELD OF THE INVENTION.

The present invention relates to the field of drilling, more specifically to a fluid used for the petroleum fr pumped from the bottom thereof, whose heaps are hydrocarbons with aromatic contents and of p BACKGROUND OF THE INVENTION.

In the state of the art, fracture fluids are used in one or more wells drilled in order to create fissures within the walls of the same well to help the fluid flow, that is, they are used to stimulate and help the control The fractures are sometimes obstructed by the S accum.

US Pat. No. 7,427,583, September 2008, for Schumberger Technology Corporation, Isabelle Couillet et al., Discloses and protects a viscoelastic aqueous product for use in the recovery of hydroxide primarily from a viscoelastic surfactant and is used In a hydrophobic manner, the advantageous concentration hydrophobically induced to bypass certain routes and result in a gel structure of viscoelastic surface active agent by typical infiltration used for the viscoelastic surfactant is injected into the rock formations to fracture said formations. Check the oil flow. mica of the surfactant that does not alter the chemical composition, the key of the invention is the use of a (surfactant) agent to amphoteric acid conditions that exhibits cationic properties U.S. Patent No. 7,096,947, August 2006, to Halliburton Energy Services, Inc., in which i and L. Todd et al., Describes and protects a fracture fluid in an additive for the control of fluid loss, and the method of in underground formations; The fluid mainly viscosity regulator and additives for the loss control of a material that deforms and degrades, that is, that does not re solids inside the well.

United States of America patents No. 6, 408, issued on August 16, 2005 and May 4, r the poly-acrylate to a hydroscopic state. As a characteristic of fracturing fluids is the variable viscosity, that is, they require the addition of additives that alter the selective vision. The preferred embodiment of this invention is that it uses carbon dioxide as the internal phase and a molecular weight poly-phase as an external phase which results in a gel that can be easily added by adding NaCl and KCl salts.

U.S. Patent No. 5,591, 700, October 1997, for Halliburton Company, whose inventor is Phillip Orators, describes and protects an aqueous fracturing fluid which has a surfactant and an active agent. in environmental conditions and it dissolves according to the formation. The viscosity inhibitor of the invention is provided by a water-soluble surfactant which is another object of the present invention to provide a fluid and pump easily.

It is also an object of the present invention to provide compatibility with the additives that are added in or fracturing.

It is still another object of the present invention to provide an adequate transport of the proppant which is the closure of the fracture.

It is still an object of the present invention that does not allow subsoil clays to swell and prevents blockage of the well.

DETAILED DESCRIPTION OF THE INVENTION.

Crude oil and natural gas reside in formations over which wells are drilled. The oil and gas natur well driven by a pressure gradient that exists between the well networks; Typically pumps are required to suppress the fluidity of the oil to the surface.

Most of the wells are fractured to hydride the flow, then the fracturing fluid is pumped to and specifically towards the formation, at a pressure and speed to fracture said formation, said fracturing is radial and vertical on the walls of the water well. It is dispersed so-called "proppant" within the fracturing fluids and formulation by a specific treatment of the fluid in the sup used.

The term fracturing fluids refers to fluids that are used at high pressures within the gas or oil wells (for the geological formations surrounding the well and for the porosity of the well. and increases the productivity of the well.

Transmit energy to the bottom of the well so that in a way a fracture in the rock where the oil is found; Transport a proppant (usually sand) from the oil source to ensure the conductivity of the same, gene Another drawback is that when the fracture operation, the fracture fluid pressure decreases and returns it is necessary to allow the flow of the fracture fluid. hydrocarbons and their use.

The fracturing fluid of the present invention maintains efficient oduction according to international standards in its viscosity, temperature, weight properties speci fi ed for use under pressure conditions of 2000 Lb / in2 and or the equivalent of 140 Kg / cm2 and up to 562.96 Kg / cm2, the ration of the present invention consists of the following substance Component one: hydrocarbon with aromatic content m n weight.

Specific weight in a range of: 0.89 to 0.96 Content of total aromatics with a higher proportion or ig viscosity index greater than: 140 Sulfur content, with a maximum of: 4.5 Technical data and ASTM methods with which pru are measured The components of the final product will be added in rciones according to their origin and composition to be able to other specific ones. The composition of the fluid is compatible with the aggregate in the fracturing process, transports the proppant that is used so that the fracture does not close dissolved cillas from the subsoil and thus avoids zo; It has a solvency power in such a way that it helps the arburo found and allows the well to be cleaned with the advantage incorporated in a period of four and up to twelve hours.

Through the value of the indicator "Kauri-Butanol index" the final product is known, on the other hand, through the temperature of the aromatic content and consequently the degree of fracturing of the present invention.

Claims (1)

1. In an improved manner, the proppant of the well immersed in the subsoil does not swell in contact with the fluid and has improved properties. CLAIMS. 1. - A fracturing fluid of oil wells with that of hydrocarbons, such as: a content by weight, greater than 40% of aromatic hydrocarbons of paraffinic origin; additive that improves the viscosity index; a viscosity index greater than 150 or adjusted for aada; temperature of inflammation of 66 ° C minimum; Kauri-Butanol index of 70 minimum. 4. - The oil well fracturing fluid, acue ica 1, also characterized because it is adapted for nes from 0 Lb / in2 to 9500 Lb / in2 or its equivalent 0 Kg 1 Kg / cm2 in the temperature range of 0 ° C up to 100 ° C.