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The Method of Steam-Assisted Gravity Drainage Startup

An auxiliary gravity and steam technology, applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc., can solve the problems of long start-up time, high cost, etc., to increase the widening speed, expand the sweep radius, improve oil recovery efficiency and oil recovery volume effect

Active Publication Date: 2020-02-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide a method for start-up of steam-assisted gravity drainage, so as to solve the problems of long start-up time and high cost of steam-assisted gravity drainage in existing heavy oil reservoirs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The SAGD fast start method provided in this embodiment includes the following specific steps:

[0043] S1, the steam injection well and the production well are preheated by steam injection cycle at the same time, and the cycle time is 25 days.

[0044] S2, inject solvent into the long oil pipe and short oil pipe of steam injection well and production well at the same time, the solvent type is a mixture of xylene and surfactant (the ratio is 100:1, and the type of surfactant is carbon chain as C 12-14 Alkyl glycoside APG1214); the total injection rate of single-well solvent in the steam injection well and the production well is 120 tons / day, the injection rate ratio between the long tubing and the short tubing is 1:1, and the injection pressure reaches the fracture pressure of the reservoir after 0.2Mpa. Note (the depth of the oil layer is 250m, and the fracture pressure of the oil layer is 5.5Mpa), and the well is stewed for 2 days.

[0045] S3, injecting steam into th...

Embodiment 2

[0051] The SAGD fast start method provided in this embodiment includes the following specific steps:

[0052] S1, the steam injection well and the production well are preheated by steam injection cycle at the same time, and the cycle time is 30 days.

[0053] S2, inject solvent into the steam injection well and the production well long tubing and short tubing at the same time, the solvent type is a mixture of diesel oil and surfactant (the ratio is 1000:1, the surfactant type is carbon chain is C 12-16 Alkyl glycoside APG1216); the total injection rate of single-well solvent for steam injection wells and production wells is 100 tons / day, the injection rate ratio of long tubing and short tubing is 1:1, and the injection pressure reaches 0.2Mpa after the fracture pressure of the reservoir. Note (the depth of the oil layer is 300m, and the fracture pressure of the oil layer is 6.5Mpa), and the well is stewed for 2 days.

[0054] S3, injecting steam into the long tubing and short...

Embodiment 3

[0060]On the basis of Example 1, the weight ratio of xylene and surfactant in the mixture of xylene and surfactant is 50:1, and other conditions are the same as in Example 1. Using the start-up method in Example 3, it takes about 100 days for the start-up phase to reach the thermal communication standard.

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Abstract

The invention provides a method for starting steam assisted gravity oil drainage. The method comprises the steps that S1, steam is injected into the tiptoe position and the heel position of a horizontal section of a gas injection well and the tiptoe position and the heel position of a horizontal section of a production well respectively, and steam circulation is conducted; and S2, solvents are injected into the tiptoe position and the heel position of the horizontal section of the gas injection well and the tiptoe position and the heel position of the horizontal section of the production wellrespectively, and well-closing is conducted. By injecting the steam into the gas injection well and the production well, the temperature of oil layers near the gas injection well and the production well can be increased rapidly and easily; by injecting the solvents into the gas injection well and the production well simultaneously and conducting well-closing to expand a flowable oil zone, reducingthe viscosity of thick oil, improving the flowability of the thick oil and enlarging the spreading radius are facilitated; and meanwhile the steam circulation process is in a dynamic mode, thereforeimproving the widening speed of an oil recovery channel is facilitated, and accordingly the oil recovery efficiency and amount in the subsequent production process can be improved easily.

Description

technical field [0001] The invention relates to the field of heavy oil exploitation, in particular to a method for starting steam-assisted gravity oil drainage. Background technique [0002] Steam-assisted gravity drainage technology (abbreviation: SAGD) was invented by Canada's Buter in 1978, and has been successfully applied in heavy oil reservoirs in Canada's oil sands mining area, my country's Liaohe Oilfield, Xinjiang Oilfield and other places. The principle is: deploy horizontal well pairs stacked above and below in the same oil layer, inject high-dryness steam into the upper steam injection well, and the steam will overlap upwards in the formation to form a steam cavity because the density is much lower than that of crude oil. With the continuous injection of steam, the steam chamber expands upwards and laterally, and exchanges heat with the crude oil in the oil layer. The viscosity of the heated crude oil is reduced, and the condensed water flows downward under the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21B43/22
CPCE21B43/2408
Inventor 杨智赵睿吴永彬张家浩罗池辉陈凤
Owner PETROCHINA CO LTD
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