back to - Gary S. Swindell, Petroleum Engineering

2005 Texas Gas Well Study Summary

Click here for the SPE 70018 paper graphs and text - "Changes in the Performance of Texas Gas Wells"

Click here for the original 1999 Oil & Gas Journal article

Year of First Production	New Gas Well Connections	Wells still Active 2-99	Maximum Production Rate - MCF/month	First year Decline Rate - %	Overall 5 year Decline Rate - %	Projected Ultimate Recovery - MMCF/Well	10 Yr Survival Rate %	Annual Prod - Gas Wells MMCF	Annual Prod - All Wells MMCF	From brand new wells	Annual Gas fm Existing	% of gas fm new gas wells	New Oil & Gas Compl (RRC)	New Gas Compl (RRC)	5th yr d1	10th yr d1	10 yr wells	Annual Prod - Oil Wells BCF
1971	1,934	204	52,324	10	10	6,245	31%	7,267,069	9,414,963	506,095	8,908,868	7.0%	7,737		11	11	600	2,147,894
1973	2,657	543	38,675	22	19	3,671	38%	7,200,071	9,196,535	522,471	8,674,064	7.3%	8,656		8	8	1000	1,996,464
1976	4,289	901	23,329	19	15	2,567	35%	6,217,431	7,675,088	523,081	7,152,007	8.4%	12,982		10	6	1490	1,457,657
1978	5,217	1,310	18,871	14	16	2,463	39%	5,643,849	7,029,862	486,306	6,543,556	8.6%	15,863		20	2	2040	1,386,013
1980	5,310	1,462	18,213	24	19	1,697	41%	5,686,583	7,009,876	498,837	6,511,039	8.8%	20,038		13	6	2200	1,323,293
1981	5,687	1,667	17,772	31	16	1,842	40%	5,379,173	6,736,439	493,663	6,242,776	9.2%	26,442		7	6	2300	1,357,266
1982	6,034	1,870	15,589	30	14	1,713	41%	4,719,622	6,107,572	466,705	5,640,867	9.9%	25,439		9	10	2500	1,387,950
1983	4,828	1,285	15,601	12	10	1,967	36%	4,234,354	5,649,601	368,275	5,281,326	8.7%	24,089		8	7	1720	1,415,247
1984	5,627	1,650	16,652	24	14	1,727	37%	4,387,003	5,875,646	432,612	5,443,034	9.9%	27,696		12	10	2100	1,488,643
1985	4,944	1,505	21,082	26	18	1,717	38%	4,326,918	5,821,436	490,977	5,330,459	11.3%	24,921		15	10	1900	1,494,518
1986	3,024	962	19,180	24	16	1,686	40%	4,234,396	5,677,514	320,729	5,356,785	7.6%	13,253		12	10	1200	1,443,118
1987	3,050	990	21,423	34	19	1,463	38%	4,165,905	5,544,145	315,946	5,228,199	7.6%	11,259		10	6	1150	1,378,240
1988	3,321	1,179	21,192	26	19	1,630	39%	4,342,480	5,714,180	357,036	5,357,144	8.2%	9,978		15	8	1310	1,371,700
1989	3,389	1,369	26,416	22	13	2,309	42%	4,282,988	5,605,992	370,229	5,235,763	8.6%	8,503		10		1420	1,323,004
1990	3,372	1,563	22,123	26	23	1,568	46%	4,257,407	5,553,177	388,018	5,165,159	9.1%	9,014		15		1559	1,295,770
1991	2,979	1,514	24,917	32	24	1,470	48%	4,226,860	5,536,911	370,936	5,165,975	8.8%	9,053		14		1420	1,310,051
1992	3,165	1,795	27,820	41	25	1,398	54%	4,146,527	5,467,163	371,919	5,095,244	9.0%	7,596		16		1697	1,320,636
1993	3,860	2,305	31,127	44	26	1,358	54%	4,335,720	5,645,452	577,094	5,068,358	13.3%	8,460		17		2080	1,309,732
1994	4,431	2,792	29,882	42	28	1,483	55%	4,492,443	5,711,491	651,222	5,060,269	14.5%	8,055		18		2443	1,219,048
1995	3,883	2,663	33,170	45	30	1,382	55%	4,569,900	5,713,023	603,289	5,109,734	13.2%	8,195				2145	1,143,122
1996	4,267	3,131	39,591	55	33	1,468		4,770,283	5,868,664	732,617	5,136,047	15.4%	8,729	4,060				1,098,381
1997	4,700	3,734	35,243	53	31	1,355		4,819,101	5,854,393	723,512	5,130,881	15.0%	9,076	4,594				1,035,292
1998	4,384	4,075	40999	56	32	1,425		4,850,384	5,833,474	822,601	5,010,873	17.0%	9,416	4,907				983,090
1999	3,558		43671	51	34	1,453		4,776,374	5,665,144	681,534	4,983,610	14.3%	5,615	3,566				888,770
2000	4,467		44894	60	34	1,491		4,881,900	5,756,448	852,301	4,904,148	17.5%	7,691	4,580				874,548
2001	5,629		38743	63	35	1,207		4,961,971	5,817,318	934,974	4,882,343	18.8%	8,869	5,787				855,346
2002	4,819		41521	62		1,261		4,885,008	5,719,048	856,745	4,862,303	17.5%	8,742	5,474				834,039
2003	5,958		36510	63		1,187		4,978,993	5,816,130	923,501	4,892,629	18.5%	9,447	6,336				837,137
2004	6,879		32355	60		1,039		5,109,751	6,037,275	958,052	5,079,223	18.7%	10,564	7,118				927,524
2005	5,632		32059	61		1,033		5,216,755	5,905,623	913,877	4,991,746	17.5%	10,651	7,197				688,868
Total	97,910
													8,729
													9,874