Key technology for treating slack coal blockage in CBM recovery: A case study from multi-lateral horizontal wells in the Qinshui Basin

Yang, Yilin; Cui, Shuqing; Ni, Yuanyong; Zhang, Guosheng; Li, Lichang; Meng, Zhenqi

doi:10.1016/j.ngib.2016.02.007

Cited by 6 publications

(3 citation statements)

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“…Apart from the application of a multilateral well in a conventional reservoir production system, a multilateral well (MLW) can be used in coalbed methane, heavy oil, or geothermal systems. Yang et al [10] analyzed CMB (coal bed methane) occurrence and the multilateral horizontal well trajectory in the Qinshui Basin, Shanxi Province. The investigation made an effort to provide a solution to the problem of slack coal production in gas recovery by reduction of the permeability due to water saturation.…”

Section: Multilateral Wells As An Asset In Reservoir Managementmentioning

confidence: 99%

End-Point Model for Optimization of Multilateral Well Placement in Hydrocarbon Field Developments

et al. 2020

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Drilling cost is one of the most critical aspects in the reservoir management plan. Costs may exceed a million dollars; thus, optimal designing of the well trajectory in the reservoir and completion are essential. The implementation of a multilateral well (MLW) in reservoir management has great potential to optimize oil production. The object of this study is to develop an integrated workflow of end-point multilateral well placement optimization integrated with the reservoir simulator supported by artificial intelligence (AI) methods. The paper covers various types of MLW construction, including: horizontal, bi-, tri-, and quad-lateral wells. For quad-lateral wells, the capital expenditure is highest; nevertheless, acceleration of oil production affects the project’s NPV (net present value), indicating the type of well that is most promising to implement in the reservoir. Tri- and quad-lateral wells can operate for 12.1 and 9.8 years with a constant production rate. The decreasing hydrocarbon production rate is affected by reservoir pressure and the reservoir water production rate. Other well design patterns can accelerate water production. The well’s optimal trajectory was evaluated by the genetic algorithm (GA) and particle swarm optimization (PSO). The major difference between the GA and PSO optimization runs is visible with respect to water production and is related to the modification of one well branch trajectory in a reservoir. The proposed methodology has the advantage of easy implementation in a closed-loop optimization system coupled with numerical reservoir simulation. The paper covers the solution background, an implementation example, and the model limitations.

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Section: Multilateral Wells As An Asset In Reservoir Managementmentioning

confidence: 99%

End-Point Model for Optimization of Multilateral Well Placement in Hydrocarbon Field Developments

et al. 2020

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“…Veeken and his colleagues [6] presented a new perspective on Gas-Well liquid loading and unloading, which also uses the swirl flow tool. In addition, Tao Yang, Chun Zhang and their colleagues [7,8] applied the swirl flow tool to the oilfields in China.…”

Section: Introductionmentioning

confidence: 99%

Structure Design of Swirl Flow Tool in the Natural Gas Well

Hang

Wang

2015

AMM

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In order to solve the problem of gas recovery by liquid drainage, the swirl flow tool was designed. Firstly, the whole structure of the swirl flow tool was introduced. The swirl flow tool includes three units, i.e. the screw basement, restrictor and setting mechanism. The characteristic of the tool is that there does not exist a gap between the outer diameter of the swirl flow tool and the inner diameter of the oil tube. Then, its work principle, setting process and deblocking process were discussed. The application results for the swirl flow tool in the oilfield show that the casing pressure is decreased by 7.0%-17.6% and the average gas production per day is increased by 7.4%-11.9%.

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“…In China, coalbed methane is mainly medium-high rank coal reservoir, which is easy to produce pulverized coal in the process of drilling and completion, fracturing and coalbed methane drainage. The causes of pulverized coal production can be summarized as follows: (1) the transformation of primary reservoir by tectonic movement to produce fissures and pulverized coal; (2) during drilling, whether overpressure or underpressure drilling, the pressure on the reservoir changes and pulverized coal is produced; (3) the transformation of coal reservoir produces pulverized coal; (4) pulverized coal is produced in the process of drainage and gas production; (5) the migration of groundwater produces pulverized coal. (6) the chemical substances of groundwater (or fracturing fluid) interact with the reservoir to produce pulverized coal.…”

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confidence: 99%

Force and Control Measures of Pulverized Coal Migration in Coalbe-d Methane Horizontal Wells

2022

ajsre

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Pulverized coal production is a common problem in the process of coalbed methane drainage and production, which is one of the key factors restricting the continuous stability drainage and production of coalbed methane. The reasons and characteristics of pulverized coal output are summarized. Through a detailed analysis of the migration and stress of pulverized coal in the borehole, the migration of pulverized coal is controlled by the stress conditions of pulverized coal, which causes the migration position of pulverized coal to change. Under the action of total pressure difference ΔF, pulverized coal particles can be divided into three situations: downward inclination, upward inclination and near horizontal migration. Finally, a solution to the control of pulverized coal is put forward from two aspects: the control of drainage and mining system and the selection of drainage and mining equipment. The research shows that continuous stability drainage and mining is the key of drainage and mining system, and controlling the hydrodynamic difference ΔF is the means to control the migration of pulverized coal. Choosing a pump with strong adaptability to pulverized coal is beneficial to coalbed methane drainage and production and increase productivity.Two horizontal wells in Shizhuang South Area 2 were replaced by membrane pumps, and the diaphragm pump system guide cover scheme was adopted. The coalbed methane production increased by about 1000m3/d, and the number of well repair was significantly reduced.

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Key technology for treating slack coal blockage in CBM recovery: A case study from multi-lateral horizontal wells in the Qinshui Basin

Cited by 6 publications

References 0 publications

End-Point Model for Optimization of Multilateral Well Placement in Hydrocarbon Field Developments

End-Point Model for Optimization of Multilateral Well Placement in Hydrocarbon Field Developments

Structure Design of Swirl Flow Tool in the Natural Gas Well

Force and Control Measures of Pulverized Coal Migration in Coalbe-d Methane Horizontal Wells

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