scholarly journals Prediction of critical liquid loading time for water-producing gas wells: Effect of liquid drop rotation

2021 ◽  
Author(s):  
Xiao Chongyang ◽  
Fu Heng ◽  
Cheng Leli ◽  
Pei Wenyu
Keyword(s):  
Liquid Drop ◽  
Early Stage ◽  
Gas Wells ◽  
Liquid Loading ◽  
Gas Reservoir ◽  
Gas Field ◽  
Gas Well ◽  
Production Stages ◽  
Field Workers ◽  
Drainage Effect

AbstractAfter more than 20 years of continuous development, part of the wells in the Moxilei-1 gas reservoir located at the Sichuan Basin have entered the middle–later production stage. With the continuous decline in formation pressure and production rates, some of the gas wells have entered the potential period of liquid loading, while some have already suffered water plugging. Currently, the field engineers usually carry out some corresponding drainage measures after the occurrence of liquid loading in the gas well, which will first affect the production progress of the gas field, then increase the difficulty in drainage and reduce the drainage effect afterward. On the basis of Pan’s model for evaluating critical liquid-carrying flow rate, the influence of liquid drop rotation was considered in the new model. Further, combined with the Arps production decline equation, a prediction model of liquid loading timing was deduced. Taking a typical well in the Moxilei-1 gas reservoir as an example, based on the early-stage production data of the gas well, the model was used to predict the liquid loading timing accurately. The model can predict the possibility and timing of liquid loading in gas wells at different production stages. It can check the gas wells with potential liquid loading, so as to reduce the workload for field workers. Furthermore, it can predict the potential liquid accumulation and its timing in advance, so as to guide the field workers to prepare for drainage in advance.

Optimization of Well Spacing for Tight Sandstone Gas Reservoirs - Case Study of Eastern Sulige Gas Field

2012 ◽  
Vol 616-618 ◽  
pp. 762-766
Author(s):  
Rui Lan Luo ◽  
Ji Wu Fan ◽  
Hong Mei Liao ◽  
Wen Xu
Keyword(s):  
Early Stage ◽  
Production Performance ◽  
Test Time ◽  
Production Data ◽  
Tight Gas ◽  
Gas Wells ◽  
Tight Sandstone ◽  
Gas Field ◽  
Gas Well ◽  
Well Spacing

Influenced by special geologic condition and stimulation, the production performance of tight fractured gas well is obviously different from that of conventional gas well. During deliverability testing, the hydraulic fractured gas well can never reach steady state with limited test time. It is difficult to calculate reserve and drainage area accurately at early development stage. Take eastern Sulige gas field for example, by correctly recognizing the percolation characteristics and production performance of hydraulically-fractured tight gas wells, and combined with core analysis, 116 hydraulically fractured tight gas wells in eastern Sulige gas field have been analyzed. A prediction chart of recoverable reserve for estern Sulige gas field is established. With this chart, the ultimately recoverable reserves, drainage sizes, drainage lengths and drainage widths of 116 hydraulically-fractured tight gas wells in eastern Sulige gas field are predicted based on early stage of production data, and finally a reasonable well spacing for this field is suggested. Only utilizing routine production data without employing additional resources, this method is a good predictive guide to launch a development plan of tight gas field.

The Research on Rational Proration to Low Yield and Pressure Gas Well in Tight Gas Reservoir

2012 ◽  
Vol 524-527 ◽  
pp. 1647-1650
Author(s):  
Deng Sheng Lei ◽  
Zhi Lin Qi
Keyword(s):  
Low Pressure ◽  
Gas Production ◽  
Low Permeability ◽  
Tight Gas ◽  
Gas Wells ◽  
Liquid Loading ◽  
Gas Reservoir ◽  
Gas Well ◽  
Factors Influencing ◽  
Tight Gas Reservoir

The rational proration is the prerequisite condition of realizing the high gas production and steady production of gas reservoir. Especially to the tight gas reservoir, due to the very low permeability, there are many low yield and low pressure gas wells. Because low yield and low pressure, the gas well is easily effected by the liquid loading and the change of working system, which cause the degree of reserve recovery decrease, more seriously make the gas stop producing directly. Based on the seepage rule in tight gas reservoir and analyzing the every factors influencing the production of low yield and pressure gas well, the low yield and pressure gas well have been classified to several types. And the gas well yields of different type have been optimized.

Non-Darcy Binomial Deliverability Equations for Partially Penetrating Vertical Gas Wells and Horizontal Gas Wells

2009 ◽  
Author(s):  
Tao Zhu ◽  
Jing Lu
Keyword(s):  
Bottom Water ◽  
Horizontal Wells ◽  
Vertical Wells ◽  
Gas Wells ◽  
Gas Reservoirs ◽  
Gas Reservoir ◽  
Gas Well ◽  
Increase Productivity ◽  
Flow Domain ◽  
Inflow Performance

Many gas reservoirs are with bottom water drive. In order to prevent or delay unwanted water into the wellbore, the producing wells are often completed as partially penetrating vertical wells, and more and more horizontal wells have been drilled in recent years in bottom water drive gas reservoirs to reduce water coning and increase productivity. For a well, non-Darcy flow is inherently a near wellbore phenomenon. In spite of the considerable study that non-Darcy behavior of fully penetrating vertical wells, there has been no study of a partially penetrating vertical well or a horizontal well in a gas reservoir with bottom water drive. This paper presents new binomial deliverability equations for partially penetrating vertical gas wells and horizontal gas wells, assuming that only radial flow occurs in the near wellbore non-Darcy’s flow domain. The inflow performance of a vertical gas well is compared with that of a horizontal gas well. The proposed equations can account for the advantages of horizontal gas wells.

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.

An Approach and Case Study on Determination of the Sulfur Deposition Radius in High Sulfur Gas Reservoir

2014 ◽  
Vol 1073-1076 ◽  
pp. 592-596
Author(s):  
Pei Luo ◽  
Yu Ming Luo ◽  
Kai Ma ◽  
Biao Zhang ◽  
Sha Sha Song
Keyword(s):  
Sulfur Deposition ◽  
Mixed Gas ◽  
Gas Reservoir ◽  
Gas Field ◽  
Gas Well ◽  
Pressure Transient ◽  
Field Development ◽  
Eastern Sichuan Basin

In the process of high sulfur gas field development, the sulfur will separate out from the mixed gas when the pressure near wellbore area drops to a critical pressure of H2S. This will reduce the reservoir porosity greatly and decrease the gas well productivity as well. This paper discusses the characteristics of pressure transient testing plots when sulfur deposition occurs based on the redial composite reservoir model. And introduce an approach to determine the sulfur deposition radius near the wellbore with pressure transient testing interpretation in high sulfur gas reservoir. The method has been applied in some high sulfur gas field in eastern Sichuan Basin. The result shows that the method is simple and practical.

scholarly journals Classification and Application of Tight Gas Wells Based on Cluster Analysis

2021 ◽  
Vol 2095 (1) ◽  
pp. 012099
Author(s):  
Zhenhua Cai ◽  
Chuanshuai Zuo ◽  
Jianying Zhu ◽  
Peng Qin ◽  
Baojiang Duan ◽  
...  
Keyword(s):  
Liquid Medium ◽  
High Energy ◽  
Low Energy ◽  
Production Performance ◽  
Tight Gas ◽  
Medium Energy ◽  
Gas Wells ◽  
Gas Field ◽  
Gas Well ◽  
Production Characteristics

Abstract The tight gas field is greatly affected by pressure in the development process. Due to the different production time and formation pressure of each well in the gas field, the production characteristics of the gas well are obviously different. After the gas well sees water, it is impossible to formulate production measures efficiently and accurately. Therefore, by analyzing the production performance characteristics of gas wells, this paper carries out the classification research of tight gas wells, and formulates the corresponding production measures according to the classification results. Taking gas well energy and liquid production intensity as the reference standard of gas well classification, the dynamic parameter indexes characterizing gas well energy and liquid production intensity are established. Gas wells with different production characteristics are divided into six categories by clustering algorithm: high energy-low liquid, high energy-high liquid, medium energy-low liquid, medium energy high-liquid, low energy-low liquid, low energy-high liquid. Then the classification method of tight gas well is formed. In this paper, 50 wells in Linxing block are selected as the research object. The research results show that most of the wells in Linxing block are located in area V, belonging to low energy and low liquid wells. It is recommended to implement intermittent production. The classification based on gas well energy and liquid production intensity are of guiding significance for the formulation of production measures in the Linxing block.

scholarly journals Visible Research of Loading Speed in Vertical Gas Well

2015 ◽  
Vol 8 (1) ◽  
pp. 163-166
Author(s):  
Wang Xiuwu ◽  
Liao Ruiquan ◽  
Liu Jie ◽  
Wang Xiaowei
Keyword(s):  
Loading Rate ◽  
Water Production ◽  
Formation Water ◽  
Gas Wells ◽  
Liquid Loading ◽  
Gas Well ◽  
Rate Law ◽  
Rate Laws ◽  
Normal Production ◽  
The Stability

For gas well under certain conditions, formation water production is inevitable in the later development; Formation water production is harmful to the normal production, it may cause liquid loading, flooding or even stop production. Based on the study of liquid loading and the rate laws of liquid loading, taking corresponding measures for the gas well is important. Simulating formation liquid production of gas wells with single rate under wellbore conditions, observing and measuring liquid loading rate through the experiment, summing up the liquid loading rate law of wellbore, are significant to the stability of gas well.

Study on Source Analysis of the Cation in Produced Water from Sulige Gas Field and Anti-Scaling Measures

2019 ◽  
Vol 814 ◽  
pp. 505-510
Author(s):  
Peng Chang ◽  
Rui Xue Shi ◽  
Li Wang ◽  
Wei Han ◽  
Cong Dan Ye ◽  
...  
Keyword(s):  
Produced Water ◽  
Xrd Analysis ◽  
Source Analysis ◽  
Scale Inhibitor ◽  
Gas Wells ◽  
Gas Field ◽  
Gas Well ◽  
Strontium Sulfate ◽  
Single Well ◽  
Main Component

A large amount of foreign matter appears in the Sulige gas well, causing blockage and corrosion of the pipeline, increasing the pressure difference in the wellbore and seriously affecting the normal production of the gas well. The gas wells with serious conditions mentioned above were selected to analyze the quality of single well produced water and the composition of blockage and core. Combined with the XRD analysis results of the cuttings, the long-term leaching experiments on the cuttings in different simulated solutions were carried out to study the sources of scaled ions in the gas wells. The experimental results showed that the extracted water from SD6-1 had high salinity and high content of scale ions Ca2+, Ba2+ and Sr2+;the main component of blockage is the acid insoluble strontium sulfate (barium) scale, and contains a small amount of corrosion products. The easily scalable Ca2+、Mg2+、Ba2+ and Sr2+ produced from the dissolution of the core in the formation water or working fluids, especially the acid erosion dissolves. According to the scaling mechanism, two kinds of Sr/Ba scale inhibitor were selected. The results showed that the barium II scale inhibitor performance is relatively good, and at the concentration of 40 mg/L, and the scale inhibition rate was more than 95%. The clogging of a single well can be reduced by adding a scale inhibitor.

Technology of water shut-off treatment in the gas well using coiled tubing

2021 ◽  
pp. 75-85
Author(s):  
D. S. Leontiev ◽  
I. I. Kleshchenko ◽  
A. D. Shalyapina ◽  
M. M. Mansurova
Keyword(s):  
Bottom Water ◽  
Urgent Problem ◽  
Gas Wells ◽  
Flexible Pipe ◽  
Gas Field ◽  
Gas Well ◽  
Coiled Tubing ◽  
Bottom Hole ◽  
Water Saturated ◽  
Gas Fields

In the modern practice of gas field operation, there is a problem associated with the inflow of bottom water to the bottom hole of the well. One of the ways to solve this urgent problem is the introduction of water isolation technologies in the development of gas fields and the use of special compositions and technological equipment for pumping liquids into the watered layers of gas wells. The article deals with the application of a set of special technological measures, such as installation of surface equipment for working in a gas well using coiled tubing, descent of a flexible pipe through a column of pump and compressor pipes with a packer, construction of an inflatable packer, as well as the use of a selective water-insulating composition of the well by pumping it through existing perforation channels in the casing string. Liquids based on ethyl silicate create a kind water shut-off screen between the gas- saturated and water-saturated parts of the gas well formation.

A Novel Intermittent Gas Lifting and Monitoring System Toward Liquid Unloading for Deviated Wells in Mature Gas Field

2017 ◽  
Vol 140 (5) ◽  
Author(s):  
Zheng Tong ◽  
Guangmin Zhao ◽  
Songbo Wei
Keyword(s):  
Data Exchange ◽  
High Efficiency ◽  
Low Cost ◽  
Field Trials ◽  
Test Field ◽  
Gas Wells ◽  
Liquid Loading ◽  
Gas Field ◽  
Automatic Production ◽  
Deviated Wells

For liquid-loading gas wells, effective deliquification operation is needed but current liquid-lifting technology is not able to meet the requirements of high efficiency as well as low cost especially in large-deviated wells. This paper proposes a hybrid deliquification technology combining plunger lift, chemical foamer injection, and down-hole monitoring to unload liquid in deviated gas wells. The system comprised multipart plunger body, deployment-retrieving integrating assembly (DRIA) and operation canisters. By means of flexible plunger body, the system performs deliquification normally in deviated wellbore. The operation canisters are carried with plunger body through tubing onto the bottom of deviated section to operate in terms of four modes: long-term down-hole monitoring, foamer injection, mobile data acquisition, and wireless data exchange with the wellhead. The key components of DRIA and injection valve are made of improved disintegrating alloy with the rating temperature of 100 °C, compressive strength of 370 MPa, and disintegrating rate of 170.9 mg/(cm2 h) characterized by lab test. Field trials were successfully performed in two liquid-loading tight gas wells, and the maximal deviated angle of the wells was 68 deg. It indicates that the new technology is a cost-effective way contributing to automatic production and management of mature gas wells in the remote area instead of traditional rigid plunger and wire-line logging.

Sign in / Sign up

Export Citation Format

Share Document