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Dynamic prediction method for wellbore flow in coal-bed gas well

A technology for coalbed methane wells and flow patterns, applied in wellbore/well components, measurement, earthwork drilling and production, etc., can solve the problem of rare flow characteristics of three-phase flow

Active Publication Date: 2015-11-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the three-phase flow composed of gas-liquid-solid, it is rarely encountered in the process of oil and gas production, and the existence of solid phase makes the existing relatively complete gas-liquid two-phase flow pattern identification method no longer applicable. The research on the flow characteristics of gas-liquid-solid three-phase flow in the wellbore is extremely rare

Method used

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  • Dynamic prediction method for wellbore flow in coal-bed gas well
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  • Dynamic prediction method for wellbore flow in coal-bed gas well

Examples

Experimental program
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Effect test

Embodiment 1

[0053] The invention discloses a method for predicting the flow dynamics of a wellbore of a coalbed methane well. figure 2 A flowchart is shown. The following combination figure 2 The method of this embodiment will be described in detail.

[0054] In step S201, the liquid in the wellbore tubing is sampled to obtain the real solid content H in the wellbore s ;Measure the liquid volume flow and gas volume flow of the wellhead, as well as the temperature and pressure of the wellhead.

[0055] Specifically, water samples were taken from the oil pipes under the production mode of oil pipe water production and casing gas production, the solid phase was coal powder, and the concentration of coal powder was measured from the water samples. If the pulverized coal particles in the water sample taken out are small and most of them can be suspended in the water with very little precipitation, the concentration of the pulverized coal particles in suspension can be measured with a turb...

Embodiment 2

[0203] This embodiment is an example of applying the method of the present invention at the engineering site. The well is a vertical well, and the average volume concentration of pulverized coal measured at the wellhead is 5%, that is, the real solid content H s =5%; the well depth is 1399.49m; the pipe diameter D=139.7-7.72=131.98mm; the casing pressure is 1MPa; the dynamic liquid level height is 806.32m.

[0204] The wellbore data table at the work site is shown in Table 4.

[0205] Table 4

[0206]

[0207] The production data are shown in Table 5.

[0208] table 5

[0209]

[0210] The wellbore heat transfer parameters are shown in Table 6.

[0211] Table 6

[0212] project

[0213] According to the method provided in Example 1, it can be obtained as Figure 6 The pressure distribution of the casing annulus in the wellbore shown, and Figure 7 The temperature distribution in the oil jacket annulus is shown. The bottom hole pressure calculated by us...

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Abstract

The invention discloses a dynamic prediction method for wellbore flow in a coal-bed gas well. The dynamic prediction method comprises following steps: sampling liquid in a wellbore oil pipe in order to acquire real solid content of a wellbore; judging the flow pattern of gas-liquid-solid three phase flow in the wellbore and determining modeling parameters for the gas-liquid-solid three phase flow; establishing a gas-liquid-solid three phase flow pressure model in the wellbore based on the real solid content and the modeling parameters in combination with the position of the working fluid level and data of well body configuration; establishing a temperature distribution model based on the gas-liquid-solid three phase flow pressure model, the real solid content and the modeling parameters by combining with heat transfer parameters of a well body; and obtaining distribution results of pressure and temperature of gas-liquid-solid three phase flow pressure in the wellbore along the depth of the wellbore based on the pressure model and the temperature distribution model. The dynamic prediction method for wellbore flow in the coal-bed gas well has the capability of predicting flow state, flow rate, pressure and temperature distribution and other physical property parameters at any position in the wellbore based on liquid production capacity and gas production capacity of a wellhead, casing pressure and other physical property parameters.

Description

technical field [0001] The invention relates to the technical field of petroleum engineering, in particular to a method for predicting the flow dynamics of a wellbore of a coalbed gas well. Background technique [0002] At present, the production mode of tubing to produce water and casing to produce gas is mostly used in the process of coalbed methane drainage, which is quite different from the conventional natural gas production mode. At the same time, due to the characteristics of brittle coal, poor cementation, fragility and easy collapse, the production pressure difference and fluid action in the early fracturing and drainage process will cause coal seam damage and produce coal powder. Because some of the particles in the produced coal powder are extremely small, and the coal matrix presents a porous structure and its own apparent density is small, part of the coal powder can closely follow the fluid flow in the wellbore, which also makes the flow in the wellbore casing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/06E21B47/00
Inventor 石在虹牛骏柯文奇苏建政张汝生张祖国唐萍王雅茹
Owner CHINA PETROLEUM & CHEM CORP
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