The Research of Gas-Water Relations in Low-Permeability Tight Sand Gas Reservoir - Taking Zizhou Gas Field for Example

2013 ◽  
Vol 734-737 ◽  
pp. 480-483
Author(s):  
Jun Bao Ma ◽  
Yu Long Ma ◽  
Chao Sun ◽  
Jian Guo Wang
Keyword(s):  
Water Relations ◽  
Water Distribution ◽  
Low Permeability ◽  
Distribution Law ◽  
Deep Basin ◽  
Gas Reservoir ◽  
Gas Field ◽  
Structural Position ◽  
Single Well ◽  
Tight Sand Gas

The gas-water relations of low-permeability tight sand gas reservoir are complex and not necessarily linked to the structural relief, phenomenon that water is distributed in high structural position while gas in low structural position is common what makes it difficult to make a refined description of gas-water relations and distribution low. The article takes Zizhou gas field for example, establishes 4 gas-water relations modes of single well to analyze some profiles where there is abnormal phenomenon water up gas down, the fact is that water and gas are distributed in different sand bodies and Zizhou Gas Field is not a deep basin gas reservoir. The research shows the phenomenon that water up gas down does not exist, the gas-water relations are normal. The research results have certain significance for the determination of gas-water distribution law.

Determing the Reasonable Single-Well Proration in Gas Reservoir by the Method of Dynamic Production

2012 ◽  
Vol 204-208 ◽  
pp. 297-302
Author(s):  
Kui Zhang ◽  
Hai Tao Li ◽  
Yang Fan Zhou ◽  
Ai Hua Li
Keyword(s):  
Low Permeability ◽  
Gas Reservoirs ◽  
Gas Reservoir ◽  
Gas Field ◽  
Gas Well ◽  
High Productivity ◽  
Well Production ◽  
Stable Production ◽  
Single Well

Low permeability, low abundance, water-bearing gas reservoirs are widely distributed in China, and their reserves constitute 85% of all kinds of reservoirs in current. It has important realistic meanings to develop them. Determining of reasonable gas well production is the prerequisite to achieving long-term high productivity and stable production. This paper takes Shanggu gas field at Sulige Gas Field for example, respectively from the dynamic data analogy methods, the pressure drop rate statistical methods, gas curve methods, production system nodal analysis methods, and studied the reasonable capacity of the low permeability gas reservoir. Through comprehensive analysis，the comprehensive technical indexes about single well reasonable production was determined.

scholarly journals Natural Gas Reservoir Characteristics and Non-Darcy Flow in Low-Permeability Sandstone Reservoir of Sulige Gas Field, Ordos Basin

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1774
Author(s):  
Xiaoying Lin ◽  
Jianhui Zeng ◽  
Jian Wang ◽  
Meixin Huang
Keyword(s):  
Driving Force ◽  
Water Distribution ◽  
Ordos Basin ◽  
Darcy Flow ◽  
Low Permeability ◽  
Threshold Pressure ◽  
Gas Migration ◽  
Gas Reservoir ◽  
Gas Field ◽  
Gas Saturation

In order to reveal the gas–water distribution and formation mechanism of the low-permeability sandstone gas reservoir, the gas reservoir distribution and the formation mechanism in a low-permeability sandstone gas reservoir are investigated using data obtained from a physical simulation experiment of gas percolation. The exploration and experimenting for petroleum in the upper Paleozoic gas pool of the Sulige gas field in the Ordos basin in this paper. Results showed that the gas reservoir is characterized by low gas saturation, a complex distribution relationship of gas–water, and weak gas–water gravity differentiation. The characteristics of gas distribution are closely related to permeability, gas flow, and migration force. The capillary pressure difference is the main driving force of gas accumulation. There exists a threshold pressure gradient as gas flows in low-permeability sandstone. The lower that permeability, the greater the threshold pressure gradient. When the driving force cannot overcome the threshold pressure (minimal resistance), the main means of gas migration is diffusion; when the driving force is between minimal and maximal resistance, gas migrates with non-Darcy flow; when the driving force is greater than maximal resistance, gas migrates with Darcy flow. The complex gas migration way leads to complicated gas- water distribution relationship. With the same driving force, gas saturation increases with the improvement of permeability, thus when permeability is greater than 0.15 × 10−3 µ m2, gas saturation could be greater than 50%.

Study on Hydrate Inhibitor to Prevent Freeze-Plugging of Gas-Condensate Well

2013 ◽  
Vol 868 ◽  
pp. 737-741 ◽  
Author(s):  
Feng Wang ◽  
Ji Nan Zhang ◽  
Chong Xi Li
Keyword(s):  
Field Condition ◽  
High Efficiency ◽  
Low Cost ◽  
Economic Losses ◽  
Gas Reservoir ◽  
Gas Field ◽  
Gas Well ◽  
Reservoir Development ◽  
Single Well ◽  
Normal Production

The phenomenon of hydrate freeze-plugging is very widespread in Jilin oilfield M gas field exploitation. Freeze-plugging tends to occur in winter, mainly including ground pipeline, wellhead and wellbore freeze-plugging, etc, which affects the normal production of gas well, also has restricted the gas reservoir development and will cause huge economic losses. In order to prevent the freeze-plugging occurred in gas well, methyl alcohol is used to inject into single well at the rate of 600 to 3080 L/day. The field condition shows that the result of injecting methanol is not obvious, besides, the toxicity of methanol and its high cost already cannot satisfy the oilfield actual demand. Therefore, we need to research and develop new hydrate inhibitors with low cost and high efficiency to solve the problem of freeze-plugging.

Numerical Simulation Study of Daqing Wuzhan Low Permeability Gas Reservoir

2013 ◽  
Vol 385-386 ◽  
pp. 474-477
Author(s):  
Yu Feng Lu ◽  
Min Yang ◽  
San Chuan Li ◽  
Bo Lv
Keyword(s):  
Numerical Simulation ◽  
Simulation Model ◽  
Simulation Study ◽  
Field Data ◽  
Confining Pressure ◽  
Low Permeability ◽  
Production Potential ◽  
Gas Reservoir ◽  
Gas Field ◽  
Porosity And Permeability

Daqing Wuzhan gas field is a deformable low permeability gas filed. Based on the lab study of changing law of porosity and permeability with confining pressure, a numerical simulation model of deformable low permeability gas reservoir is established and is solved by using IMPES method. Comparing with the result of eclipse shows the method is valid. Field example shows the dynamic geological reserves of Wuzhan gas field is low and the new wells should be drilled at the area where there is production potential and larger effective thickness. Comparison of results obtained from different models with field data shows the result considering medium deformation is more reasonable.

Reservoir Characterization and Flow Simulation of a Low-Permeability Gas Reservoir: An Integrated Approach for Modelling the Tommy Lakes Gas Field

2011 ◽  
Vol 50 (05) ◽  
pp. 32-47 ◽  
Author(s):  
Jack H. Deng ◽  
Roberto Aguilera ◽  
Mohammed Alfarhan ◽  
Lionel White ◽  
John S. Oldow ◽  
...  
Keyword(s):  
Reservoir Characterization ◽  
Flow Simulation ◽  
Integrated Approach ◽  
Low Permeability ◽  
Gas Reservoir ◽  
Gas Field

Application of Bio-enzymatic Completion Fluid in the Tight Sand Gas Reservoir of Ordos Daniudi Gas Field

2010 ◽  
Author(s):  
Lan Qiang ◽  
Li Gongrang ◽  
Jinghui Zhang ◽  
Li Haibin ◽  
Wang Liping
Keyword(s):  
Gas Reservoir ◽  
Gas Field ◽  
Tight Sand Gas

scholarly journals Productivity Testing and Analysis of Low Permeability and Thick Layer of N Gas Field

2020 ◽  
Vol 213 ◽  
pp. 02002
Author(s):  
Quan Hua Huang ◽  
Xing Yu Lin ◽  
Zhi-xing Yang ◽  
Ke-feng Lu ◽  
Xian-kang Hu
Keyword(s):  
Steady State ◽  
Statistical Method ◽  
Thick Layer ◽  
Theory Model ◽  
Theoretical Formula ◽  
Low Permeability ◽  
Testing Time ◽  
Gas Wells ◽  
Gas Reservoir ◽  
Gas Field

For a better guidance of production, a combination of drill stem testing (DST), regional statistical method and pseudo steady-state seepage theory model was used to analyze the productivity of N gas reservoir in light of the complex geological features of the low-permeability thick-layer. Firstly, the DST method was used to test the N gas reservoir. And then the binomial pseudo-pressure method, binomial pressure square method and exponential method were used to interpret the test data of DST of this formation. Finally, the binomial pseudo-pressure interpretation method was used and the results showed that only the productivity of H3b layer was successfully tested of the four. The H3a, H4b and H5a layers are ultra-low pore and permeability gas reservoirs and the productivity of these layers can’t be explained by the available data due to the short testing time and a non-stationary state of testing pressure and quantity, resulting in the failure of the test. The productivity of the main layers were estimated and forecasted by the regional statistical method and the theoretical model of pseudo steady-state seepage, taking the arithmetic average value of the regional statistical method and the theoretical formula as the final value of absolute open flow rates(AOF). The final calculation results are as follows: the AOF of main gas layers H3a, H3b, H4b and H5a in N gas field is 31.30×104m3/d, 388.92×104m3/d, 20.82×104m3/d and 30.80×104m3/d, respectively. This method may sheds light on verifying and calculating the productivity of gas wells and determining the reasonable production allocation of gas wells.

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