MASSMAN B
Lease 1001138655 · Leavenworth County, Kansas · SW Sec 23 T8S R21E · DOR 126415
Oil1986–20255 wells
Operator
IGWT, Inc.
Cumulative (state figure)
48,928.45 bbl
First production
1986
Last production
2025
Location (PLSS)
SW Sec 23 T8S R21E
Monthly oil production
162 months filed with the Kansas Geological Survey, Sep 1986 to Oct 2025. Volumes are bbl at lease level — a lease can cover many wells, so this is not a well's output.
Total over the months shown
48,928.40 bbl
Months filed
162
Most wells in a month
5
| Month | Oil (bbl) | Wells |
|---|---|---|
| Oct 2025 | 147.64 | 5 |
| Jul 2025 | 146.35 | 5 |
| Jan 2025 | 149.53 | 5 |
| Oct 2024 | 141.50 | 5 |
| Mar 2024 | 155.37 | 5 |
| Aug 2023 | 142.01 | 5 |
| Aug 2022 | 143.93 | 4 |
| Feb 2022 | 146.44 | 4 |
| Sep 2021 | 141.45 | 4 |
| Jun 2019 | 135.02 | 4 |
| Mar 2018 | 157.47 | 4 |
| Mar 2017 | 158.02 | 4 |
| Jul 2016 | 153.73 | 4 |
| Mar 2016 | 156.78 | 4 |
| Aug 2015 | 151.88 | 4 |
| May 2015 | 147.60 | 4 |
| Jan 2015 | 146.08 | 4 |
| Aug 2014 | 149.90 | 4 |
| May 2014 | 150.75 | 4 |
| Jan 2014 | 152.93 | 4 |
| Oct 2013 | 149.04 | 4 |
| Jul 2013 | 150.71 | 4 |
| May 2013 | 149.83 | 4 |
| Mar 2013 | 151.90 | 4 |
| Dec 2012 | 153.03 | 4 |
| Oct 2012 | 147.46 | 4 |
| Aug 2012 | 152.97 | 4 |
| Jun 2012 | 154.07 | 4 |
| Apr 2012 | 151.22 | 4 |
| Jan 2012 | 154.37 | 4 |
| Dec 2011 | 149.18 | 4 |
| Sep 2011 | 144.49 | 4 |
| Aug 2011 | 152.42 | 4 |
| Jun 2011 | 149.15 | 4 |
| Apr 2011 | 143.80 | 4 |
| Feb 2011 | 143.04 | 4 |
| Jan 2011 | 142.27 | 4 |
| Nov 2010 | 155.66 | 4 |
| Sep 2010 | 149.76 | 4 |
| Jul 2010 | 150.68 | 4 |
| Jun 2010 | 144.46 | 4 |
| Apr 2010 | 150.25 | 4 |
| Mar 2010 | 140.87 | 4 |
| Jan 2010 | 144.47 | 4 |
| Dec 2009 | 152.33 | 4 |
| Oct 2009 | 152.40 | 4 |
| Sep 2009 | 154.28 | 4 |
| Jul 2009 | 144.15 | 4 |
| Jun 2009 | 151.77 | 4 |
| May 2009 | 151.08 | 4 |
| Mar 2009 | 154.10 | 4 |
| Feb 2009 | 150.53 | 4 |
| Jan 2009 | 157.99 | 4 |
| Dec 2008 | 150.11 | 4 |
| Nov 2008 | 153.37 | 4 |
| Sep 2008 | 152.87 | 4 |
| Aug 2008 | 151.73 | 4 |
| Sep 2007 | 109.34 | 2 |
| Nov 2000 | 61.66 | 2 |
| Jul 2000 | 54.03 | 2 |
| May 2000 | 35.24 | 2 |
| Feb 2000 | 94.23 | 2 |
| Jan 2000 | 92.96 | 2 |
| Aug 1999 | 65.36 | 2 |
| Apr 1999 | 73.43 | 2 |
| Nov 1998 | 157.10 | 2 |
| Jul 1998 | 162.73 | 2 |
| Feb 1998 | 159.53 | 2 |
| Nov 1997 | 73.18 | 2 |
| Sep 1997 | 42.66 | 2 |
| Aug 1997 | 64.88 | 2 |
| Jul 1997 | 75.92 | 2 |
| Jun 1997 | 79.63 | 2 |
| Apr 1997 | 69.33 | 2 |
| Dec 1996 | 42.00 | 3 |
| Nov 1996 | 44.00 | 3 |
| Oct 1996 | 68.53 | 2 |
| Sep 1996 | 103.00 | 3 |
| Aug 1996 | 73.14 | 2 |
| Jul 1996 | 83.00 | 3 |
| Jun 1996 | 62.38 | 2 |
| May 1996 | 111.00 | 3 |
| Apr 1996 | 103.00 | 3 |
| Mar 1996 | 118.00 | 3 |
| Feb 1996 | 126.00 | 3 |
| Jan 1996 | 89.00 | 3 |
| Oct 1995 | 17.00 | 3 |
| Sep 1995 | 17.00 | 3 |
| Apr 1995 | 8.00 | 3 |
| Sep 1994 | 64.00 | 3 |
| May 1994 | 62.00 | 3 |
| Mar 1994 | 65.00 | 3 |
| Oct 1993 | 64.00 | 3 |
| Sep 1993 | 96.00 | 3 |
| Jul 1993 | 116.00 | 3 |
| May 1993 | 85.00 | 3 |
| Apr 1993 | 67.00 | 3 |
| Oct 1992 | 80.00 | 3 |
| Aug 1992 | 151.00 | 3 |
| Jun 1992 | 153.00 | 3 |
| Feb 1992 | 160.00 | 3 |
| Nov 1991 | 118.00 | 3 |
| Sep 1991 | 110.00 | 3 |
| Aug 1991 | 100.00 | 3 |
| Jul 1991 | 308.00 | 3 |
| Jun 1991 | 150.00 | 3 |
| May 1991 | 274.00 | 3 |
| Apr 1991 | 299.00 | 3 |
| Mar 1991 | 447.00 | 3 |
| Feb 1991 | 164.00 | 3 |
| Jan 1991 | 143.00 | 3 |
| Dec 1990 | 246.00 | 3 |
| Nov 1990 | 160.00 | 3 |
| Oct 1990 | 156.00 | 3 |
| Sep 1990 | 160.00 | 3 |
| Jul 1990 | 153.00 | 3 |
| Jun 1990 | 319.00 | 3 |
| May 1990 | 178.00 | 3 |
| Apr 1990 | 155.00 | 3 |
| Mar 1990 | 156.00 | 3 |
| Feb 1990 | 342.00 | 3 |
| Jan 1990 | 191.00 | 3 |
| Dec 1989 | 145.00 | 3 |
| Nov 1989 | 324.00 | 3 |
| Oct 1989 | 327.00 | 3 |
| Sep 1989 | 572.00 | 3 |
| Aug 1989 | 589.00 | 3 |
| Jul 1989 | 159.00 | 3 |
| Jun 1989 | 424.00 | 3 |
| May 1989 | 403.00 | 3 |
| Apr 1989 | 438.00 | 3 |
| Mar 1989 | 467.00 | 3 |
| Feb 1989 | 461.00 | 3 |
| Jan 1989 | 313.00 | 3 |
| Dec 1988 | 419.00 | 3 |
| Nov 1988 | 811.00 | 3 |
| Oct 1988 | 637.00 | 3 |
| Sep 1988 | 444.00 | 3 |
| Aug 1988 | 831.00 | 3 |
| Jul 1988 | 807.00 | 3 |
| Jun 1988 | 1,047.00 | 3 |
| May 1988 | 1,250.00 | 3 |
| Apr 1988 | 1,051.00 | 3 |
| Mar 1988 | 1,228.00 | 3 |
| Feb 1988 | 802.00 | 3 |
| Jan 1988 | 925.00 | 3 |
| Dec 1987 | 1,050.00 | 3 |
| Nov 1987 | 1,121.00 | 3 |
| Oct 1987 | 688.00 | 3 |
| Sep 1987 | 512.00 | 3 |
| Aug 1987 | 653.00 | 3 |
| Jul 1987 | 1,125.00 | 3 |
| Jun 1987 | 561.00 | 3 |
| May 1987 | 1,054.00 | 3 |
| Apr 1987 | 1,477.00 | 3 |
| Mar 1987 | 1,308.00 | 3 |
| Feb 1987 | 1,261.00 | 3 |
| Jan 1987 | 1,331.00 | 3 |
| Dec 1986 | 1,363.00 | 3 |
| Nov 1986 | 1,543.00 | 3 |
| Oct 1986 | 1,030.00 | 3 |
| Sep 1986 | 1,423.00 | 3 |
Lease-level volumes as filed with the Kansas Geological Survey. A blank well count is a month the state filed no count for, not a month with no wells.
Wells on this lease
5 wells the state's well register assigns to this lease. Every one has a page.
| Well | No. | Operator | Status |
|---|---|---|---|
| MASSMAN 'B' UNIT was LYDIA HEINTZELMAN 1 | H-M 1 | IGWT, Inc. | Producing |
| MASSMAN 'B' UNIT was HEINTZELMAN-MILLER 2 | H-M 2 | IGWT, Inc. | Producing |
| MASSMAN 'B' UNIT was HEINTZELMAN-MILLER 4 | H-M 4 | IGWT, Inc. | Producing |
| MASSMANN | 1 | IGWT, Inc. | Converted to EOR Well |
| H. MASSMAN | 2 or 120-2 | IGWT, Inc. | Producing |
Location
39.335450, -95.043952 · SW Sec 23 T8S R21E
Kansas Geological Survey data, corpus built 2026-09-07. Lease 1001138655. The state’s own record.