CBM 93-002 was the last Coal Bed Methane exploration well drilled of the three planned 2010 CBM ... One Water Injection Falloff Test on wireline was conducted over the interval 701.5m to ... After a successful BOP test they rigged down the BOP testing equipment and gave the rig a full service.

Three coal zones were individually through pressure-transient injection-falloff tests using a total of 278 tons of CO 2 (about 93 tons per coal zone). Coal seams at the test site can sequester more than 1,740 tons of CO 2 per acre (30 million scf/acre). Therefore, this project affected only the area immediately surrounding the coalbed methane well.

Injection – Falloff Tests. Sigra conducts two types of injection – fall off tests. Both utilise Sigra's drill stem test tools to inject rather than to produce. The basic procedure is the same in either case. Namely the DST tool is run to isolate the test zone and set. The formation pressure is then allowed to come to near equilibrium.

equipment that was followed by a post injection-production test. A second well (FBV 5) was drilled 487 m north of the first well. FBV 5 was cored and logged for reservoir property data. The well was then cased and completed in one Medicine River coal seam. A combination of production tests and water-injection falloff tests were conducted to ...

The three most important coalbed methane reservoir properties are the gas-in-place volume (based upon thickness, density, and gas content), the degree of gas ... the coal seams of interest with equipment resulting in core diameters of 48 to 89 mm and ... either open-hole drill stem tests or water injection falloff tests in either open or cased ...

To enhance, by injection of carbon dioxide, coalbed methane (CBM) recovery factors and production rates to an economic rate in ... 2 Injection/Falloff Test 2nd Production Test 2nd CO ... surface recording equipment.

coal test are (1) to determine if sequestration of carbon dioxide in mature coalbed methane reservoirs is a safe and effective method to mitigate greenhouse gas emissions and (2) to determine if sufficient injectivity exists to efficiently drive CO 2-enhanced coalbed methane recovery. Coalbed methane is produced from multiple thin coal

Test for a Pressure Leak with Injection Testing - Tanzania. TAM's PosiFrac® Multi-set Straddle System is the most flexible and reliable inflatable packer system for selectively testing multiple zones. It can be used in both open-hole and cased wells for long-term or short-term testing programs. The assembly can be inflated to isolate ...

Coal bed methane (CBM), which is also referred to as coal seam gas (CSG) in some parts of the world is methane that is generated and trapped in a coal seam. In the United States, more than 32 trillion cubic feet (TCF) of natural gas has been …

Research on coalbed methane well testing has produced several useful findings: Coal permeability is very sensitive to stress conditions. When performing injection/falloff tests on coal seams it is important to inject at very low rates to avoid fracturing the coal and to minimize stress effects.

A Study on the Well Test Analysis of Coalbed Methane Using the BFP-IFT ... D.P. and Lee, W.J., 1990, "Design and Interpretation of Injection/Falloff Tests for Coalbed Methane Wells," The 65th Annual Technical Conference and Exhibition, Society of Petroleum Engineers, New Orleans, Louisiana, USA, Sep 23-26, pp. 427-428, SPE 20569.

7.3 INJECTION/FALLOFF WELL TEST METHOD FOR COALBED METHANE WELLS 7.3.1 Equipment and Technology for Injection/Falloff Well Testing 7.3.1.1 Test String 7.3.1.2 Measuring Instruments 7.3.1.3 Water Injection Pump 7.3.1.4 Testing Process 7.3.2 Well Test Design of Injection/Falloff 7.3.2.1 Selection of Shut-In Mode ...

Single phase well test analysis is simpler and more reliable than two phase testing. Even though injection/falloff tests have been successfully used in testing coal seams, there are some drawbacks to using injection/falloff tests. One problem with injection/falloff tests is that it is easy to fracture the coal during injection.

The slug test has been much used to analyze coal-bed methane. ln 3 + = 2 25. where it is important to determine the bulk permeability of the connected fissure system. Reference [15] proposed an. 4. Or. equation to define a normalized pseudopressure of the form: = 2 . 26. ln 3+ 1 ( ) 4 = Or. 1 ( ) 16. Supposing a stress dependent pseudopressure ...

Subtask 6.1, Two-Well Pilot Test of CO, Injection ..... 2 Subtask 6.2, CO,/N, Laboratory ... Coalbed methane (CBM) is the hydrocarbon gas consisting largely of methane that is either ... The Pressure Falloff Test (PFOT) taken the second half of September 1994 on the injector was compared to the pre-CO, Pressure Buildup Test taken in October ...

A matrix injection/falloff test (MIFOT) is performed at a rate well below the fracturing rate, typically about 0.1 gal/min. It is important to inject at low rates to avoid fracturing the coal and to minimize permeability changes due to stress effects. Typical injection time is 8 h followed by at least 48-h shut-in period. Longer injections and ...

The water and gas injection rates are set to 100 m3/day to keep the injection pressure below the formation fracture pressure. Pressure fall-off test is included in the simulation following two days of water injection and ten days of gas injection. The period of fall-off test was five days.

Coal-Bed Methane On location for the first-ever - in ExxonMobil history - Injection-Falloff Tests in a Coal-Bed Methane (Coal-Seam Gas) play in Germany. Collaboration with the reservoir engineer in the interpretation of the downhole data on-site allowed for modifications to the program to ensure that objectives were met.

Isolation packers and monitoring equipment were installed to observe reservoir pressure and gas composition during injection of CO2. The injection operation included the injection of 1,000 tons of CO2 into the stacked coal seams over a one month period. Injectivity was higher than anticipated with an average of more than 40-tons injected per day.

Analysis of numerous injection/falloff tests in the field, primarily on coalbed methane wells, has led to a better understanding of the requirements for proper injection/falloff testing.

INJECTION FALL-OFF TEST (IFT) To determine the economic feasibility of coal bed methane well, it is necessary to evaluate the productive potential of coal seams prior to well fracturing and formal production including trial production. Generally, the reservoir data needed for evaluation can be obtained through well test. At present, the well ...

The project focuses on the injection of about 1,000 tons of CO 2 into a mature coalbed methane well and a series of buildup and falloff tests that will be monitored in the injection well and a series of remote observation wells. Before the injection test, one shallow water observation well and three deep

DOI: 10.1016/J.FUEL.2009.06.003 Corpus ID: 94292896. Evaluation of gas content of coalbed methane reservoirs with the aid of geophysical logging technology @article{Fu2009EvaluationOG, title={Evaluation of gas content of coalbed methane reservoirs with the aid of geophysical logging technology}, author={Xue-hai Fu and Yong Qin and Geoff G X Wang and Victor Rudolph}, journal={Fuel}, …

Well test in CBM Reservoir Slug. Test Injection Test/Falloff Test Interference Test Pressure Buildup Test 1.Slug Tests. Aslug testis a particular type of aquifertestwhere water is quickly added or removed from a groundwater well, and the change in hydraulic head is monitored through time, to determine the near-well aquifer characteristics.

In recent times, enhanced deep-buried coalbed methane recovery has increased the interest in coal and unconventional natural gas exploration. This study investigated liquid CO 2 (LCO 2) injection to enhance coalbed methane recovery, the variation in the gas component and the sweep efficiency of CH 4 recovery by LCO 2 injection into coal were studied under laboratory conditions.

First, injection/falloff tests do not require reservoir flow; therefore, they can be run in underpressured as well as normal and overpressured reservoirs. It usually is easier to measure injection rates in an injection/falloff test than it is to estimate flow rates in a drillstem test …

Abstract Coalbed methane (CBM) reservoirs are a growing source of relatively clean energy in many parts of the world. CBM reservoirs are fundamentally different from traditional hydrocarbon reservoirs. Gas is adsorbed on the surface of the coal cleats and not stored in pores. Still, estimation of the permeability of the coal cleats is important in judging the potential producibility of a given ...

Three coal zones were individually through pressure-transient injection-falloff tests using a total of 278 tons of CO2 (about 93 tons per coal zone). Coal seams at the test site can sequester more than 1,740 tons of CO2 per acre (30 million scf/acre). Therefore, this project affected only the area immediately surrounding the coalbed methane well.

References Xingpeng JING, Coal-Bed Methane Index Well Test Experiment Research based on Injection/Fall-Off Method[J].Coal science and technology. 2008,36(10): 38-40.

First, injection/falloff tests do not require reservoir flow; therefore, they can be run in underpressured as well as normal and overpressured reservoirs. It usually is easier to measure injection rates in an injection/falloff test than it is to estimate flow rates in a drillstem test when fluids are not produced to the surface.

Combining Pressure Falloff and Buildup Testing Using Wireline Formation Tester in Coal Bed Methane Environment  ..., either an injection test or production test was applied to coal bed seams. In this paper we present a new approach that combines injection and buildup testing.

Evaluation of Coalbed Methane Reservoirs By ... An inexpensive procedure for conducting injection/falloff test is "Tank Test" that reduces the injection pressure. The procedure is based on using gravity drainage of water from a tank rather than using pumping equipment to inject water. The Tank Test can be performed in hydrostatically low ...

Analysis of numerous injection/falloff tests in the field, primarily on coalbed methane wells, has led to a better understanding of the requirements for proper injection/falloff testing.

SECARB CO2 Injection Test in Mature Coalbed Methane Reservoirs of the Black Warrior Basin, Blue Creek Field, Alabama ... and major project activities 47 48 included a series of production-buildup and injection-falloff tests. ... Alabama State Route 69 runs just west of the well pad and 18 19 provided ready access for the trucks and equipment ...