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Oil recovery process

A technology for recovering oil and formations, applied in chemical instruments and methods, production fluids, earth drilling and production, etc., can solve the problems of being incompatible with oil and unsuitable for strengthening oil

Inactive Publication Date: 2014-08-27
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Methane is miscible with oil at higher pressures (e.g. 100 MPa at 100°C), however, since this pressure is lower than the minimum miscibility pressure required to establish multiple contact miscibility of methane with oil, at lower pressures (such as less than 50MPa) can not be miscible with oil
As a result, associated gas or other gases mainly composed of methane are not suitable as miscible gases for enhanced oil recovery from formations with pressures less than 50 MPa

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0055] Slim tube tests were performed to determine the effect of dimethyl ether (DME) on the miscibility of associated gas with oil recovered from the formation. Still crude oil recovered from the formation is filtered and mixed with associated gas produced from the same formation to obtain the desired gas / oil ratio (91.84cc / cc) and bubble point pressure (38.3MPa) to produce a performance of recombined new oil). The composition of this freshly recovered oil is provided in Table 1 and the composition of the associated gas in Table 2.

[0056] Table 1

[0057]

[0058]

[0059] Physical properties calculated based on GPA2145-00 physical constants

[0060] Table 2

[0061]

[0062]

[0063]

[0064] Standard conditions: 60F, 283.7K, 14.696psia (0.101325MPa)

[0065] Reconstituted fresh oil was used to saturate a 1 / 4" (0.635 cm) ID and 40' (12.19 m) length straw packed with 200 mesh sand. The slim tubing had a pore volume of 141.7 cc and the slim tubing had a 40...

Embodiment 2

[0075] An oil swell test was performed to measure the effect of adding 20.74 mole % DME to the oil used in Example 1 above. The oil has the properties listed in Table 1 above. For comparison, an oil swelling test was performed on a blank sample containing only oil, and the addition of 20 mol% CO to the oil 2 oil swelling test.

[0076] Oil swelling tests were performed in visible PVT cells. For each test, the pond was charged with a measured volume of freshly produced oil (as described in Example 1) at a pressure above saturation pressure (38.3 MPa) and at the formation temperature of the formation producing the oil (79.4°C). prepared above), and 20.7 mol% of DME, 20 mol% of CO 2 . The cell is pressurized as the gas is added until the fluid is a single phase. When the cell is pressurized, a constant composition expansion test is performed to measure the saturation pressure and the relative liquid volume below the saturation pressure of the resulting fluid. While pressuri...

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Abstract

The present invention provides a method for enhancing the recovery of oil from a formation. A hydrocarbon-containing gas and an ether are injected into an oil-bearing formation to mobilize the oil. The mobilized oil is then produced from the formation.

Description

field of invention [0001] The present invention relates to a method of recovering oil from a subterranean formation, and in particular, the present invention relates to a method of enhanced oil recovery from a subterranean formation. Background of the invention [0002] In recovering oil from a subterranean formation, it is possible to recover only a portion of the oil in the formation using primary recovery methods that utilize natural formation pressure to produce oil. A portion of the oil that cannot be recovered from the formation using primary recovery methods can be recovered by enhanced oil recovery (EOR) methods. There are three main types of EOR—thermal, chemical / polymer, and gas injection—that can be used to enhance oil recovery from a reservoir beyond what is possible through traditional means, potentially extending field life and increasing oil recovery factor. [0003] Thermally enhanced recovery is performed by applying heat to the reservoir. The most widely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/38E21B43/22
CPCE21B43/168C09K8/594
Inventor C·P·A·布洛姆R·海登A·N·马察克斯E·于哈拉-纳加敏
Owner SHELL INT RES MAATSCHAPPIJ BV
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