Methods for testing stimulation fluids

a technology of fluid treatment and stimulation, which is applied in the direction of fluid removal, survey, borehole/well accessories, etc., can solve the problems of time-consuming and difficult laboratory evaluation methods

Inactive Publication Date: 2012-02-23
SCHLUMBERGER TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]By measuring pressures or pressures and flow rates during injection various tests can be applied to compare the effectiveness

Problems solved by technology

Due to the large rock mass involved, this type of evaluation is extremely difficult and time consuming to conduct in the laboratory.

Method used

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  • Methods for testing stimulation fluids
  • Methods for testing stimulation fluids
  • Methods for testing stimulation fluids

Examples

Experimental program
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Embodiment Construction

[0024]In FIG. 1, a well 11 is shown drilled through a formation 10. The well 11 includes an upper cased section 11-1 and a lower openhole section 11-2. The lower openhole section is shown with a layer 12 of formation damaged and invaded through a prior drilling process which left residuals of the drilling fluids in the layer surrounding the well as filter cake.

[0025]In this embodiment, a wireline tool 13 as shown in FIG. 1 is lowered into the well 11 using string of drillpipe 14. The drill string 14 is suspended from the surface by means of a drilling rig 15. In the example as illustrated, the wireline tool includes a formation testing device 13-1 combined with a formation drilling device 13-2. Such tools are known and commonly used to collect reservoir fluid samples from cased sections of boreholes. The CHDT™ open hole drilling and testing tool as offered commercially by Schlumberger is an example of such a tool. The connection to the surface is made using a wireline 13-3 partly gu...

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Abstract

A method of testing the performance of a stimulation fluid by placing a sample of the stimulation fluid or a precursor thereof into the body of a downhole tool, positioning the tool in juxtaposition with a rock face at a downhole location, forming a sealing contact between the rock face and the tool; and injecting the sample into the rock face while monitoring pressure and / or flow rates during the injection of the sample into and / or production of formation fluid from the rock face to derive a measure of the effectiveness of the stimulation fluid in creating openings in the rock face.

Description

FIELD OF THE INVENTION[0001]The present invention is generally related to hydrocarbon well stimulation, and is more particularly directed to a method for testing stimulation fluid treatments under downhole conditions.BACKGROUND[0002]Stimulating production through the injection of a stimulation fluid into a subterranean reservoir is well known. Among the most commonly applied methods are hydraulic fracturing and acidizing or a combination of both called acid fracturing or fracture acidizing. In the former case the stimulation fluid is referred to as fracturing fluid, whilst in the latter it is called acidizing fluid or simply acid.[0003]In hydraulic fracturing a fluid is pumped from the surface into a wellbore at a pressure and rate sufficient to open fractures in the rock. During an acidizing treatment the acid or acid mixture (typically including hydrofluoric and hydrochloric acids depending on the rock type) is injected from the surface into the reservoir to dissolve materials tha...

Claims

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Application Information

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IPC IPC(8): E21B49/08
CPCE21B43/26E21B49/10E21B49/088
InventorZIAUDDIN, MURTAZARAMAMOORTHY, RAGHUMONTARON, BERNARD A.
OwnerSCHLUMBERGER TECH CORP