Drill Stem Test (DST)
Data Entry & Quantitative Analysis
Description
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Work is partially supported by the U.S. Department of Energy (DOE) National Energy Technology Laboratory (NETL) under Grant Number DE-FE0002056.

This Java Applet allows the user to enter or import Drill Stem Test (DST) Data directly into the program. There are essentially no standard ASCII DST data files formats existing that will allow the user to read and process DST Data. This program was written to assist the user in entering DST data, perform quantitative analysis on the shut in pressure data and then to save the information into a Log ASCII Standard (LAS) version 3.0 File developed by the Canadian Well Logging Society . This version provides a means to collect all the geological data in one file. Although the LAS 3.0 Format has default data types, the user can add their own data types to the file provided they use the primary section types, i.e., Parameter, Definition and Data whenever possible, which are briefly paraphrased below, 1.

The Kansas Geological Survey (KGS) Database contains over 1000 digital Trilobite DST reports that the user can access and download into the applet.

This web application will take advantage of over 11 years of Java development experience at the Kansas Geological Survey (KGS) in developing web applications that plot oil & gas data and allows the geologist to perform analysis with that data, i.e. GEMINI Project & Tools on the KGS Web Site.

GEMINI (Geo-Engineering Modeling through INternet Informatics) Project was developed to allow the geologist to seamlessly integrate databases and geological analytical tools across the web. Analytical tools were designed for the independent oil and gas operators, consultants, and widely separated team members within and outside companies.

The DST Data will be saved under the "~TEST_..." data sections, which is considered the default LAS 3.0 Section for this data, an example is shown below.
~Test_Parameter[1]
#MNEM .UNIT VALUE : DESCRIPTION {FORMAT}
ID .  DST 1 : DST ID {S}
FORM .  Mississippian : Formation {S}
STRT .FT 3664.0 : Interval Depth From {F}
STOP .FT 3690.0 : Interval Depth To {F}
DEV .  NO : Deviated {S}
WHIP .FT   : Wipstock {F}
SERL .  6773 : Serial Number {F}
READ .  Inside : Reading (Inside/Outside) {S}
PRES .PSI 414.1 : Pressure {F}
DEPT .FT 3665.0 : At Depth {F}
CMMNT .  IF Weak blow, Slow increases 4", ISI No blow, FF Weak blow, BOB in 37 min FSI No blow : Test Comments {S}
HOLE .IN 7.88 : Hole Diameter {F}
COND .  Poor : Hole Condition {S}
CAP .PSI 8000.0 : Capacity {F}
STIM .DATE 01/09/2011 : Start Date/Time {MM/DD/YYYY}
ETIM .DATE 01/10/2011 : End Date/Time Logger {MM/DD/YYYY}
TIMC .DATE   : Last Calibration {MM/DD/YYYY}
TIMON .DATE   : Time on Bottom {MM/DD/YYYY}
TIMOF .DATE   : Time off Bottom {MM/DD/YYYY}
TYPE .  Conventional Bottom Hole : Test Type {S}
UNIT .  34 : Logging Unit Number {F}
LGGR .  Trilobite Testing : DST Logging Company {S}
ENG .  Esak Hadley : Recording Engineer {S}
MUD .  Gel Chem : Mud type {S}
MUDD .GM/CC 9.0 : Mud Density {F}
MUDV .SEC/Qt 47.0 : Mud Viscosity (Funnel) {F}
FL .CI 5.97 : Fluid Loss {F}
RM .OHM-M   : Resistivity of Mud {F}
MSAL .PPM 3000.0 : Mud Salinity {F}
CAKE .IN   : Filter Cake {F}
CSHT .    : Cusion Type {S}
CSHL .FT   : Cusion Length {F}
CSHV .BBL   : Cusion Volume {F}
GCSHT .    : GAS Cusion Type {S}
GCSHP .PSI   : GAS Cusion Length {F}
OAPI .DEG API   : Oil API {F}
WSAL .PPM 85000.0 : Water Salinity {F}
SLOPE .PSI/CYCLE 0.0 : Horner Plot Slope {F}
FLOW .STB/DAY 19.052 : Flow Rate {F}
THICK .FT 10.0 : Vertical Thickness of Continuous Porosity {F}
VIS .CP 0.1 : Viscosity {F}
FPRES .PSI 414.1 : Formation Pressure {F}
FTEMP .DEG F 114.0 : Formation Temperature {F}
BETA .RB/STB 1.0 : Formation Volume Factor {F}
Z .    : Gas Deviation Factor {F}
KHU .MD-FT/CP 106.198 : Transmissibility (Kh/u) {F}
KH .MD-FT 10.62 : Permeability Thickness (Kh) {F}
PERM .MD 1.062 : Effective Permeability (K) {F}
PIS .PSI   : Initial Static Reservoir Pressure {F}
PWF .PSI 414.1 : Bottom Hole Flowing Pressure {F}
TIMEF .MIN 91.0 : Flow Time {F}
RADIS .FT 0.657 : Well Bore Radius {F}
DRAIN .FT 2140.0 : Drainage Radius {F}
PHI .PU   : Porosity {F}
COMPS .vol/vol/psi 1.0E-5 : Compressibilities {F}
GRAV .    : Specific Gravity of Gas (air=1) {F}
PWFC .PSI   : Flowing Pressure Corrected for Turbulence {F}
DR .  2.255 : Damage Ratio {F}
S .  4.829 : Skin Factor {F}
DELPS .PSI 635.881 : Pressure Drop due to Skin {F}
DELPT .PSI   : Pressure Drop due to Turbulence {F}
PI .STB/DAY/PSI 0.062 : Productive Index {F}
RI .FT 67.143 : Radius of Investigation {F}
QS .STB/DAY 41.093 : Settled Production Rate {F}
AOF .MCF/DAY   : Absolute Open Flow {F}
ELP1 .  9 : Exclude Points Data Points Below Shut In 1 {F}
EUP1 .  33 : Exclude Points Data Points Above Shut In 1 {F}
M1 .PSI/CYCLE -190.771 : Shut In 1 Slope {F}
P1 .PSI 1078.086 : Shut In 1 Intercept {F}
ELP2 .  12 : Exclude Points Data Points Below Shut In 2 {F}
EUP2 .  30 : Exclude Points Data Points Above Shut In 2 {F}
M2 .PSI/CYCLE -157.52 : Shut In 2 Slope {F}
P2 .PSI 1078.869 : Shut In 2 Intercept {F}
RECTL .FT 800.0 : Recovery Total Length {F}
RECTV .BBL 6.247 : Recovery Total Volume {F}
RECC .  RW ,14 @47F=85000 ppm : Recovery Comments {S}
TYPE_D .  FLUID : Type of DST Test, FLUID or GAS {F}
CNT_R .  3 : Total number of Recovery Pressure Data {F}
CNT_G .  1 : Total number of Gas Rates Data {F}
CNT_1 .  33 : Total number of Shut In 1 Pressure-Temperature-Time Data {F}
CNT_2 .  36 : Total number of Shut In 2 Pressure-Temperature-Time Data {F}
~Test_Definition[1]
#MNEM .UNIT VALUE : DESCRIPTION {FORMAT} | ASSOCIATION
_T_TYPE .    : Type of Data {S}
_T_ID .    : Period {S}
_T_TIME .MIN   : Time {F}
_T_PRES .PSI   : Pressure {F}
_T_TEMP .DEG F   : Temperature {F}
_T_RATE .MCF/DAY   : Gas Rate {F}
_T_CHOKE .IN   : Choke {F}
_T_LEN .FT   : Length {F}
_T_VOL .BBL   : Volume {F}
_T_DESC .    : Description {S}
~Test_Data[1] | Test_Definition[1]
# _T_TYPE _T_ID _T_TIME _T_PRES _T_TEMP _T_RATE _T_CHOKE _T_LEN _T_VOL _T_DESC
"Recovery","-999.25",-999.25,-999.25,-999.25,-999.25,-999.25,55.0,0.27,"MCW 40%m 60%w"
"Recovery","-999.25",-999.25,-999.25,-999.25,-999.25,-999.25,190.0,0.934,"MCW 25%m 75%w"
"Recovery","-999.25",-999.25,-999.25,-999.25,-999.25,-999.25,555.0,5.043,"MCW 10%m 90%w"
"Gas Rates","0",0.0,0.0,-999.25,0.0,0.0,-999.25,-999.25,"Gas Rates"
"Summary","-999.25",0.0,1916.58,106.15,-999.25,-999.25,-999.25,-999.25,"Initial Hydrostatic"
"Summary","-999.25",12.0,68.92,110.06,-999.25,-999.25,-999.25,-999.25,"Open to Flow 1"
"Summary","-999.25",44.0,239.67,115.88,-999.25,-999.25,-999.25,-999.25,"Shut-in 1"
"Summary","-999.25",348.0,1049.42,116.7,-999.25,-999.25,-999.25,-999.25,"End Shut-in 1"
"Summary","-999.25",109.0,257.73,114.46,-999.25,-999.25,-999.25,-999.25,"Open to Flow 2"
"Summary","-999.25",168.0,414.1,117.63,-999.25,-999.25,-999.25,-999.25,"Shut-in 2"
"Summary","-999.25",348.0,1049.42,116.7,-999.25,-999.25,-999.25,-999.25,"End Shut-in 1"
"Summary","-999.25",357.0,1804.33,114.39,-999.25,-999.25,-999.25,-999.25,"Final Hydrostatic"
"Shut In 1","-999.25",0.0,239.67,115.88,-999.25,-999.25,-999.25,-999.25,"Shut In 1"
"Shut In 1","-999.25",2.0,722.7959259259254,115.65693282636248,-999.25,-999.25,-999.25,-999.25,"Shut In 1"
"Shut In 1","-999.25",4.0,907.7656626506024,115.43386565272496,-999.25,-999.25,-999.25,-999.25,"Shut In 1"
"Shut In 1","-999.25",6.0,932.1897590361446,115.21079847908746,-999.25,-999.25,-999.25,-999.25,"Shut In 1"
"Shut In 1","-999.25",8.0,948.448129298487,114.99545454545455,-999.25,-999.25,-999.25,-999.25,"Shut In 1"
"Shut In 1","-999.25",10.0,958.6709628610729,114.91280991735537,-999.25,-999.25,-999.25,-999.25,"Shut In 1"
"Shut In 1","-999.25",12.0,968.893796423659,114.8301652892562,-999.25,-999.25,-999.25,-999.25,"Shut In 1"
"Shut In 1","-999.25",14.0,979.1166299862449,114.74752066115703,-999.25,-999.25,-999.25,-999.25,"Shut In 1"
"Shut In 1","-999.25",16.0,986.8782315112541,114.7,-999.25,-999.25,-999.25,-999.25,"Shut In 1"
"Shut In 1","-999.25",18.0,994.482733118971,114.7,-999.25,-999.25,-999.25,-999.25,"Shut In 1"
...
"Shut In 1","-999.25",56.0,1041.1080753138076,114.80359229975936,-999.25,-999.25,-999.25,-999.25,"Shut In 1"
"Shut In 1","-999.25",58.0,1042.5440585774058,114.81390512203507,-999.25,-999.25,-999.25,-999.25,"Shut In 1"
"Shut In 1","-999.25",60.0,1043.980041841004,114.82421794431076,-999.25,-999.25,-999.25,-999.25,"Shut In 1"
"Shut In 1","-999.25",62.0,1045.4160251046026,114.83453076658645,-999.25,-999.25,-999.25,-999.25,"Shut In 1"
"Shut In 1","-999.25",64.0,1046.8520083682008,114.84484358886215,-999.25,-999.25,-999.25,-999.25,"Shut In 1"
"Shut In 2","-999.25",0.0,414.1,117.63,-999.25,-999.25,-999.25,-999.25,"Shut In 2"
"Shut In 2","-999.25",5.0,880.3144871794872,117.4272972972973,-999.25,-999.25,-999.25,-999.25,"Shut In 2"
"Shut In 2","-999.25",10.0,920.4683975903615,117.22459459459459,-999.25,-999.25,-999.25,-999.25,"Shut In 2"
"Shut In 2","-999.25",15.0,942.8599638554217,117.08251290877797,-999.25,-999.25,-999.25,-999.25,"Shut In 2"
"Shut In 2","-999.25",20.0,959.9761849710983,117.00506024096386,-999.25,-999.25,-999.25,-999.25,"Shut In 2"
"Shut In 2","-999.25",25.0,972.9017349397591,116.92760757314974,-999.25,-999.25,-999.25,-999.25,"Shut In 2"
"Shut In 2","-999.25",30.0,984.0631865106676,116.85015490533563,-999.25,-999.25,-999.25,-999.25,"Shut In 2"
"Shut In 2","-999.25",35.0,989.8752993805919,116.77270223752151,-999.25,-999.25,-999.25,-999.25,"Shut In 2"
"Shut In 2","-999.25",40.0,995.6874122505162,116.6952495697074,-999.25,-999.25,-999.25,-999.25,"Shut In 2"
"Shut In 2","-999.25",45.0,1001.1307820607858,116.66130247763249,-999.25,-999.25,-999.25,-999.25,"Shut In 2"
"Shut In 2","-999.25",50.0,1005.5136582653818,116.64839814177564,-999.25,-999.25,-999.25,-999.25,"Shut In 2"
"Shut In 2","-999.25",55.0,1009.8965344699777,116.63549380591878,-999.25,-999.25,-999.25,-999.25,"Shut In 2"
"Shut In 2","-999.25",60.0,1014.2794106745738,116.62258947006194,-999.25,-999.25,-999.25,-999.25,"Shut In 2"
...
"Shut In 2","-999.25",155.0,1045.9321759622937,116.64392523364486,-999.25,-999.25,-999.25,-999.25,"Shut In 2"
"Shut In 2","-999.25",160.0,1046.629740769835,116.65514018691589,-999.25,-999.25,-999.25,-999.25,"Shut In 2"
"Shut In 2","-999.25",165.0,1047.3273055773764,116.66635514018692,-999.25,-999.25,-999.25,-999.25,"Shut In 2"
"Shut In 2","-999.25",170.0,1048.0248703849177,116.67757009345794,-999.25,-999.25,-999.25,-999.25,"Shut In 2"
"Shut In 2","-999.25",175.0,1048.7224351924588,116.68878504672898,-999.25,-999.25,-999.25,-999.25,"Shut In 2"

Reference:
(1) LAS 3.0 Log ASCII Standard Document #1 File Structures by Canadian Well Logging Society: http://www.cwls.org/las_info.php
(2) Drillstem Test Interpretation Seminar by H.W.Reid Author & Instructor
(3) Recent Developments in the Interpretation and Application of DST Data by L.F.Maier Journal of Petroleum Technology Volume 14, Number 11, November 1962, pgs 1213-1222 http://www.onepetro.org/mslib/servlet/onepetropreview?id=00000290

Author: John R. Victorine jvictor@kgs.ku.edu

The URL for this page is http://www.kgs.ku.edu/software/DST/description.html