A model of calculating the circulating pressure loss in coiled tubing ultra-short radius radial drilling

Ma, Dongjun; Li, Gensheng; Huang, Zhongwei; Niu, Jilei; Hou, Cheng; Liu, Mingjuan; Li, Jingbin

doi:10.1016/s1876-3804(12)60072-x

Cited by 26 publications

(10 citation statements)

References 6 publications

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“…The pressure loss occurs primarily in 5 parts of the circulation system e the spiral CT section, the straight CT section, the flexible hose, the jet nozzle and the horizontal annulus. According to the research of Ma et al (2012), the pressure loss of fluid flowing in the annulus is negligible.…”

Section: Constraint Conditionsmentioning

confidence: 99%

“…The ID and length of the flexible hose were 0.01 m and 20 m, respectively. The results are listed in Table 1 Ma et al (2012) ignored the pressure loss due to fluid flow through the jet nozzle, which accounts for a large proportion of the total pressure loss of the circulation system. According to experimental results obtained by Li et al (2011), the nozzle pressure drop can be calculated by…”

Section: Pressure Loss In the Flexible Hosementioning

confidence: 99%

“…By comparing the experimental result with the value calculated by Eq. (15), a modified equation is derived as follows: Pressure loss in the straight CT sectionThe pressure loss in the straight CT section(Ma et al, 2012) can be calculated as follows:…”

mentioning

confidence: 99%

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Maximum drillable length of the radial horizontal micro-hole drilled with multiple high-pressure water jets

Chi

Huang

et al. 2015

Journal of Natural Gas Science and Engineering

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Section: Constraint Conditionsmentioning

confidence: 99%

Section: Pressure Loss In the Flexible Hosementioning

confidence: 99%

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Maximum drillable length of the radial horizontal micro-hole drilled with multiple high-pressure water jets

Chi

Huang

et al. 2015

Journal of Natural Gas Science and Engineering

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“…The hose selected has an outer diameter of 12.7 mm and of inner diameter is 6.35 mm. Its pressure loss, ∆p, can be calculated by Equation (1) [16,17]:…”

Section: Preliminary Designmentioning

confidence: 99%

Research on and Design of a Self-Propelled Nozzle for the Tree-Type Drilling Technique in Underground Coal Mines

Zhou

et al. 2015

Energies

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Due to the increasing depths of coal mines and the low permeability of some coal seams, conventional methods of gas drainage in underground mines are facing many problems. To improve gas extraction, a new technique using water jets to drill tree-type boreholes in coal seams is proposed. A self-propelled water-jet drilling nozzle was designed to drill these boreholes. The configuration of the self-propelled nozzle was optimized by conducting drilling experiments and self-propelling force measurements. Experimental results show that the optimal self-propelled nozzle has a forward orifice axial angle at 25˝, a radial angle at 90˝, a center distance of 1.5 mm, and backward pointing orifices with an axial angle of 25˝. The self-propelling force generated by the jets of the nozzle with 30 MPa pump pressure can reach 29.8 N, enough to pull the hose and the nozzle forward without any external forces. The nozzle can drill at speeds up to 41.5 m/h with pump pressures at 30 MPa. The radial angles of the forward orifices improve the rock breaking performance of the nozzle and, with the correct angle, the rock breaking area of the orifices overlap to produce a connecting hole. The diameter of boreholes drilled by this nozzle can reach 35.2 mm. The nozzle design can be used as the basis for designing other self-propelled nozzles. The drilling experiments demonstrate the feasibility of using the tree-type drilling technique in underground mines.

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“…Properties of drilling fluid affected the friction pressure losses observably, it was found that drill cuttings in drilling fluid can significantly increase friction pressure losses of fluid in CT, and the higher the flow rate is, the more significantly the friction losses increase. In Ma et al [15], the mathematical model of pressure losses in circulation system is established for coiled tubing ultrashort radius radial drilling, and there are some researches on the calculation of pressure losses of high pressure hose. However, as far as we know, there is no research on the calculation of pressure losses of whole coiled tubing drilling system (CTDS) including BHA, coiled tubing, and straight tubing.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study of Flow Behavior of Coiled Tubing Drilling System

Guan

et al. 2014

Advances in Mechanical Engineering

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Coiled tubing drilling has become an important development direction of drilling. The method of combining theoretical calculation with the experimental verification is adopted to analyze the flow of the coiled tubing drilling system. A set of experimental bench is developed, three kinds of curvature ratio of coiled tubing are used, and the frictional pressure losses of coiled tubing and partial pressure drop of each downhole tool are tested. The results of experiments with water agree well with rough pipe calculation model. The pressure losses of coiled tube are obviously larger than that of straight tube, and the value of it is about 11-17%. The larger the curvature ratio is, the more the pressure losses of coiled tubing are. The fluid experiment with the polymer presents obviously the drag reduction effect. Experiment of simulated bottom hole assembly shows that partial pressure drop of bottom hole assembly is large. It has a little effect on the pressure losses of coiled tubing when whole bottom hole assemblies are connected. The research results can be used as the basis for formulating coiled tubing drilling process parameters, which will provide a guide for engineering practice.

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A model of calculating the circulating pressure loss in coiled tubing ultra-short radius radial drilling

Cited by 26 publications

References 6 publications

Maximum drillable length of the radial horizontal micro-hole drilled with multiple high-pressure water jets

Maximum drillable length of the radial horizontal micro-hole drilled with multiple high-pressure water jets

Research on and Design of a Self-Propelled Nozzle for the Tree-Type Drilling Technique in Underground Coal Mines

An Experimental Study of Flow Behavior of Coiled Tubing Drilling System

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