Injection-production two-trip pipe string balanced well killing control method

A control method and balanced pressure technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of lowering oil layer temperature, long killing operation time, increasing well killing fluid pollution and damage to the formation, etc.

Active Publication Date: 2012-09-05
CHINA NAT OFFSHORE OIL CORP +2
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] In the existing thermal recovery wells, the injection and production strings are killed in two trips. The well killing operation is carried out when the oil well is self-flowing and there is basically no production, and then the pump is put into production. The energy injected into the formation cannot be fully

Method used

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  • Injection-production two-trip pipe string balanced well killing control method
  • Injection-production two-trip pipe string balanced well killing control method
  • Injection-production two-trip pipe string balanced well killing control method

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Embodiment

[0161] The general principle of the present invention will be described below by taking a multi-component thermal fluid huff and puff well located in an oilfield in Bohai Sea as an example.

[0162] Original formation data: original formation pressure 9MP a , the original formation temperature is 46°C, the supply radius is 600m, and the total geological reserves of the oilfield are 3×10 6 m 3 , original formation water storage 1×10 6 m 3 , oil layer depth 940m, formation thermal diffusivity 0.002m 2 / h, the specific heat of rock is 0.7KJ / (kg·℃), and the density of rock is 1900kg / m 3 , the thermal conductivity of rock is 2.4W / (m·℃);

[0163] Reservoir geophysical parameters: oil layer thickness 7m, permeability 4.56×10 -3 μm 2 , porosity 0.351, skin coefficient 0.38, formation crude oil viscosity 449mPa s, surface degassed crude oil density 0.92g / cm 3 , the original oil saturation is 0.7, the original water saturation is 0.2, the irreducible water saturation is 0.2, and...

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Abstract

The invention provides an injection-production two-trip pipe string balanced well killing control method. The method comprises the following steps of: (1) calculating productivity and formation pressure during the flow period of a multiple thermal fluid huff-puff well; (2) determining the well killing time; (3) calculating the bottom hole pressure during well killing; (4) calculating the density of well killing fluid and selecting the well killing fluid; (5) calculating the using quantity of the well killing fluid; and (6) determining the well killing way. According to the method provided by the invention, the multiple thermal fluid huff-puff well can be timely converted from oil flow production to mechanical oil production, and the energy in the injection formation can be fully utilized; and simultaneously, the time effectiveness of the well intervention operation can be minimized, the pollution of an oil layer and the heat loss of the formation can be reduced to the greatest extent, and the high-speed and high-efficient development of an offshore heavy oil field can be kept.

Description

technical field [0001] The invention relates to a matching process technology for thermal recovery of heavy oil, in particular to a method for controlling balanced well killing of two injection-production strings when the stage of heavy oil thermal recovery is changed from self-injection oil recovery to mechanical oil recovery. Background technique [0002] The multi-element thermal fluid stimulation technology is an efficient thermal recovery technology for heavy oil, which mainly uses the multi-element thermal fluid generator to burn the injected fuel (diesel or natural gas) and oxidant (air) in the combustion chamber, relying on the generated high temperature The high-pressure gas vaporizes the mixed water to produce high-temperature and high-pressure thermal fluid, and then adds chemical agents (foaming agents or viscosity reducers) to form multi-component thermal fluid according to technical needs, and injects the formed mixture into the oil layer together, relying on th...

Claims

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Application Information

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IPC IPC(8): E21B43/24
Inventor 徐文江孙永涛邹剑孙玉豹顾启林林涛文权段凯滨刘海涛
Owner CHINA NAT OFFSHORE OIL CORP
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