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Method and system for producing an oil and gas mixture through a well

A technology of oil-gas mixture and oil well, which is applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc., and can solve the problems of gas cap exhaustion, easy wear, and reduced oil production.

Inactive Publication Date: 2009-07-01
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This resulted in a substantial reduction in oil production and an unnecessary depletion of the gas cap
Once the gas cone has fully formed, it can only be stopped by substantially recovering well production, which causes production delays
[0006] International patent application WO98 / 25005 discloses a method of crude oil production, in which a small amount of gas from the gas cap is injected into the production tubing, and the amount of gas injected is controlled by a downhole one-way check valve, which is not adjustable , and easy to wear

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  • Method and system for producing an oil and gas mixture through a well

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Embodiment Construction

[0026] figure 1 The well 1 shown in is producing a mixture of crude oil from an oil-bearing formation 2 and a minimum amount of gas from a gas-bearing formation 3 which lies beneath a fluid-impermeable caprock 4 . The oil well 1 includes an inflow zone 5, wherein the well casing 6 includes perforations 7 through which formation fluid enters the wellbore.

[0027] Production tubing 8 is suspended from a wellhead 9 equipped with a production choke 10 that dynamically controls the rate of production of well products through the well 1 .

[0028] A packer 11 is provided near the lower end of the production tubing 8, and the packer seals the annular space 12 between the production tubing 8 and the well casing 6.

[0029] The production choke 10 controls the production rate of the well product at a high level so that gas cones 13 start to form and gas bubbles 14 are entrained in the crude oil stream passing through the perforations 7 into the well inflow zone 5 .

[0030] The gas ...

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Abstract

The present invention provides a method and system for controlling oil and gas production in an oil well so that the oil well can operate at the edge of the gas cone. In addition, the flow rate and / or pressure of the produced well product is controlled through a dynamically controlled choke to continuously produce a limited amount of gas in the produced oil while avoiding full gas cones and gas flow from the gas cap. run away. The chokes can be controlled by a control system that includes an algorithm that uses wellhead temperature, pressure, and choke position as measured variables and maintains the average bulk velocity of well products at a substantially constant high level. Optionally, the system also maintains an optimum gas to fluid ratio for the well product.

Description

technical field [0001] The present invention relates to a method and system for controlling the production of a petroleum and natural gas mixture through an oil well extending into an oil-bearing formation beneath a gas-bearing formation. Background technique [0002] Wells may be free flowing, or activated by lift gas injected downhole to reduce the density of the well effluent within the production tubing. Methods for dynamic control of lift gas injection into production tubing are disclosed in European Patent Nos. 840836 and 945589 and British Patent Application Nos. 2342109 and 2252797. These prior art references do not disclose technical measures to counteract the gas cone effect. [0003] It is well known that gas cones occur when oil is produced from a thinner oil-bearing layer below a gas-bearing layer commonly called a gas cap. The lower pressure at the bottom of the upright production tubing will gradually intensify the oil in the reservoir, eventually pulling th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/12E21B43/32
CPCE21B43/12E21B43/32E21B43/122
Inventor 阿德里安·N·埃肯
Owner SHELL INT RES MAATSCHAPPIJ BV
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