-<xsd:schema elementFormDefault="qualified" attributeFormDefault="unqualified" targetNamespace="http://www.witsml.org/schemas/1series" version="1.4.1.1">

-<!--

-->

-<!--

 Energistics License Agreement
	This file is distributed under the Energistics License Agreement at
	http://www.energistics.org
	Use of this file constitutes agreement with the Energistics License Agreement.
	Copyright (c) 2012 Energistics. All rights reserved.
	Energistics, WITSML, PRODML and RESQML are trademarks or registered trademarks of Energistics.

-->

-<!--

-->

<xsd:include schemaLocation="cs_extensionNameValue.xsd"/>

<xsd:include schemaLocation="attgrp_uid.xsd"/>

-<!--

-->

-<xsd:complexType name="cs_stimFetTest">

-<xsd:annotation>

<xsd:documentation>A diagnostic test determining fluid efficiency.</xsd:documentation>

<xsd:appinfo>Modified-in-version=1.4.1, By-issue=W-CR-010, Change=Added</xsd:appinfo>

</xsd:annotation>

-<xsd:sequence>

-<xsd:element name="analysisMethod" type="witsml:StimAnalysisMethod" minOccurs="0" maxOccurs="unbounded">

-<xsd:annotation>

<xsd:documentation>An analysis method used for this FET test.</xsd:documentation>

<xsd:appinfo>Modified-in-version=1.4.1.1, By-issue=WCR-2012-0002, Change=Added</xsd:appinfo>

</xsd:annotation>

</xsd:element>

-<xsd:element name="dTimStart" type="witsml:timestamp" minOccurs="0" maxOccurs="1">

-<xsd:annotation>

<xsd:documentation>Start time for the fluid efficiency test (FET).</xsd:documentation>

</xsd:annotation>

</xsd:element>

-<xsd:element name="dTimEnd" type="witsml:timestamp" minOccurs="0" maxOccurs="1">

-<xsd:annotation>

<xsd:documentation>End time for the fluid efficiency test.</xsd:documentation>

</xsd:annotation>

</xsd:element>

-<xsd:element name="endPdlDuration" type="witsml:timeMeasure" minOccurs="0" maxOccurs="1">

-<xsd:annotation>

<xsd:documentation>The end of the pressure dependent leakoff portion of the fluid efficiency test.</xsd:documentation>

</xsd:annotation>

</xsd:element>

-<xsd:element name="fractureCloseDuration" type="witsml:timeMeasure" minOccurs="0" maxOccurs="1">

-<xsd:annotation>

<xsd:documentation>The time at which the fracture effectively closes without proppant in place.</xsd:documentation>

</xsd:annotation>

</xsd:element>

-<xsd:element name="fractureClosePres" type="witsml:pressureMeasure" minOccurs="0" maxOccurs="1">

-<xsd:annotation>

<xsd:documentation>The pressure at which the fracture effectively closes without proppant in place.</xsd:documentation>

</xsd:annotation>

</xsd:element>

-<xsd:element name="fractureExtensionPres" type="witsml:pressureMeasure" minOccurs="0" maxOccurs="1">

-<xsd:annotation>

<xsd:documentation>The fracture pressure limit for an unfractured formation is the fracture initiation pressure. This is typically considered the upper bound for the minimum horizontal stress or closure pressure. A step rate test is used to determine the fracture extension pressure.</xsd:documentation>

</xsd:annotation>

</xsd:element>

-<xsd:element name="netPres" type="witsml:pressureMeasure" minOccurs="0" maxOccurs="1">

-<xsd:annotation>

<xsd:documentation>The difference between the fracture extension pressure and the pressure that exists in the fracture.</xsd:documentation>

</xsd:annotation>

</xsd:element>

-<xsd:element name="porePres" type="witsml:pressureMeasure" minOccurs="0" maxOccurs="1">

-<xsd:annotation>

<xsd:documentation>The pressure of the liquids in the formation pores.</xsd:documentation>

</xsd:annotation>

</xsd:element>

-<xsd:element name="pseudoRadialPres" type="witsml:pressureMeasure" minOccurs="0" maxOccurs="1">

-<xsd:annotation>

<xsd:documentation>The Horner plot is used to determine if pseudo-radial flow developed during pressure decline. If a semi-log straight line is observed and the line can be extrapolated to a reasonable value of reservoir pressure, radial or pseudo-radial flow may be affecting the decline behavior. This suggests that the fracture is already closed and that data beyond the point of influence need not be considered in the evaluation of closure.</xsd:documentation>

</xsd:annotation>

</xsd:element>

-<xsd:element name="fractureLength" type="witsml:lengthMeasure" minOccurs="0" maxOccurs="1">

-<xsd:annotation>

<xsd:documentation>Fracture length is the length of the fracture tip to tip; fracture half length, the length of one wing of a fracture from the wellbore to the tip.</xsd:documentation>

</xsd:annotation>

</xsd:element>

-<xsd:element name="fractureWidth" type="witsml:lengthMeasure" minOccurs="0" maxOccurs="1">

-<xsd:annotation>

<xsd:documentation>The width of a fracture at the wellbore. Hydraulic frac width is generated by frac fluid viscosity and/or pump rate (i.e., horsepower).</xsd:documentation>

</xsd:annotation>

</xsd:element>

-<xsd:element name="fluidEfficiency" type="witsml:volumePerVolumeMeasurePercent" minOccurs="0" maxOccurs="1">

-<xsd:annotation>

<xsd:documentation>A measurement, derived from a data frac, of the efficiency of a particular fluid in creating fracture area on a particular formation at a set of conditions.</xsd:documentation>

</xsd:annotation>

</xsd:element>

-<xsd:element name="pdlCoef" type="witsml:unitlessQuantity" minOccurs="0" maxOccurs="1">

-<xsd:annotation>

<xsd:documentation>The pressure dependent leakoff coefficient.</xsd:documentation>

</xsd:annotation>

</xsd:element>

-<xsd:element name="residualPermeability" type="witsml:permeabilityRockMeasure" minOccurs="0" maxOccurs="1">

-<xsd:annotation>

<xsd:documentation>That permeability which remains after a fractured formation has closed, allowing the the formation fracture face to be pressurized before the fracture is mechanically reopened.</xsd:documentation>

</xsd:annotation>

</xsd:element>

-<xsd:element name="extensionNameValue" type="witsml:cs_extensionNameValue" minOccurs="0" maxOccurs="unbounded">

-<xsd:annotation>

<xsd:documentation>Extensions to the schema based on a name-value construct.</xsd:documentation>

</xsd:annotation>

</xsd:element>

</xsd:sequence>

-<xsd:attributeGroup ref="witsml:attgrp_uid">

-<xsd:annotation>

<xsd:documentation>Unique identifier that has been assigned to the (XML) node.</xsd:documentation>

</xsd:annotation>

</xsd:attributeGroup>

</xsd:complexType>

</xsd:schema>