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Method of producing hydrocarbon gas and production wells

A technology for producing wells and gas, applied in the field of hydrocarbon gas, which can solve the problems of interaction complexity and cost

Inactive Publication Date: 2007-08-15
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Known methods can only be applied in special cases and all have disadvantages, especially due to interactions with gas extraction, complexity and costs

Method used

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  • Method of producing hydrocarbon gas and production wells
  • Method of producing hydrocarbon gas and production wells
  • Method of producing hydrocarbon gas and production wells

Examples

Experimental program
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Embodiment Construction

[0036] Refer to Figure 1. The figure schematically shows the pressure p (unit: Pa) distribution along the depth d (unit: m) of a vertical well in a static position (for example, during the closing of the gas well). The vertical well has a liquid at its bottom. Column, with a gas column on top. The pressure at the surface (d=0) is expressed as P 0 . Depth of well on surface and top of liquid column d 1 The space is filled with gas. The pressure p in the gas-filled part 1 increases linearly with the depth d, p(d)=p 0 +ρ g gd, where ρ g Is the density of the gas (kg / m 3 ), g is the standard geocentric gravity.

[0037] In the liquid column (reference number 3 in the figure), the hydrostatic pressure p increases with the density of the liquid ρ 1 Increase proportionally, p(d)=p 0 +ρ g gd t +ρ 1 g(d-d 1 ). When the well is in fluid communication with the surrounding rock formation at a certain depth, and the pressure of the rock formation is very low, the liquid will be discharged into...

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PUM

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Abstract

A method of producing gas from an underground formation, which is penetrated by a production well to surface, the method comprising allowing formation fluid comprising gas and liquid to flow into the production well at a production interval; allowing the formation fluid to separate into a gaseous component and a liquid component; producing the gaseous component through the production well to the surface; accumulating the liquid component in the production well so as to form a liquid column having, at a drainage interval of the production well, a pressure exceeding the pressure in the surrounding formation; and allowing liquid from the liquid column at the drainage interval to drain away into the surrounding formation, comprising treating the wall of the production well at the drainage interval and / or treating the formation surrounding the drainage interval so as to increase the flow rate of liquid into the surrounding formation.

Description

Technical field [0001] The invention relates to a method and system for extracting gas from underground rock formations, especially hydrocarbon gas. Background technique [0002] In known systems for the production of hydrocarbon gas, a production well is used to penetrate the gas-bearing formation. Reservoir fluids may be contained in a production interval, for example, through perforations in the casing of an oil well at a certain depth. Reservoir fluids generally include liquids, especially water, in addition to gases. [0003] When entering a production well from, for example, a so-called high-permeability rock vein, the liquid is usually present in the formation fluid. When the reservoir conditions (pressure, temperature) at the depth of the production interval are such that the formation fluid contains vapor or liquid dissolved in gas, the liquid can also be formed by solidification in the process of reaching the surface. [0004] When the flow rate to the well is low enoug...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/38E21B43/00
CPCE21B43/385E21B43/13
Inventor 迪尔克·J·利格特尔姆保卢斯·H·J·韦贝克
Owner SHELL INT RES MAATSCHAPPIJ BV