Control of fluid flow during treatment of subterranean sites using well fluid injection

A technology for ground and well treatment, applied in the direction of production fluid, wellbore/well components, drilling composition, etc., which can solve the problems of low sweep efficiency and other issues

Inactive Publication Date: 2013-06-12
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Ripple inefficiencies have been addressed in a number of ways

Method used

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  • Control of fluid flow during treatment of subterranean sites using well fluid injection

Examples

Experimental program
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example

[0032] The invention will be further illustrated in the following examples. It should be understood, that these Examples, while indicating preferred embodiments of the invention, are given by way of illustration only. From the above discussion and these examples, those skilled in the art can ascertain the essential characteristics of the present invention, and without departing from the scope of the present invention, can make various changes and modifications to the present invention, so that it is applicable to various application and conditions.

[0033] abbreviation used in examples

[0034] "h" means hours; "L" means liters; "°C" means degrees Celsius; "mg" means milligrams; "mm" means millimeters; "kg" means kilograms; "ppt" means parts / "mM" means millimole per liter; "%" means percentage; "min" means minute; "mL / min means milliliter / minute; "D" means day; "μg / L" means Refers to micrograms per liter; "nM" refers to nanomoles per liter; "μM" refers to micromoles per...

example 1

[0035] Example 1 (predictive)

[0036] Determining breakthrough time in producing wells

[0037] The breakthrough time of each production well was determined using a chemical tracer such as fluorescein dye sodium salt, commonly known as sodium fluorescein (CAS518-47-8, part number A833-500, Fisher Scientific , 2000 Park Lane Drive, Pittsburgh, PA 15275).

[0038] Sodium fluorescein (2.7 kilograms, kg) was added to a tank containing 9,000 L of water. Shut off the normal flow of injection water to the injection well to be tested. The water treated with sodium fluorescein was injected into the injection well after 7.2 hours, and the injection rate was equal to 1,250L / h, which is a normal injection flow rate. When the injection of 9,000 L of sodium fluorescein solution was completed, the normal water injection flow rate of 30,000 L / D was resumed. After initiation of sodium fluorescein injection, samples were taken from associated production wells at various time intervals,...

example 2

[0039] Example 2 (predictive)

[0040] Inoculate subterranean sites without microbial seed loss

[0041] In this example, the injection and production wells at the subterranean site are arranged as figure 1 The inverse five-point pattern shown. For the purposes of this example, assume that producer P2 has the shortest breakthrough time, followed by producer P4, which has the second shortest breakthrough time. Microbial inoculum suspensions were prepared by forming in 6,000L tanks a nutritional chemical fluid suitable for utilization by specific microorganisms. The microbial inoculum is then added to the nutrient chemical fluid to form a suspension having the desired concentrations of microorganisms and nutrients.

[0042] Then take the following steps:

[0043] 1) Shut off the normal injection flow into the injection well.

[0044] 2) Inject the inoculum suspension into the injection well at a normal injection rate (ie, 1,250 L / h for 4.8 h).

[0045] 3) Shutting down...

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Abstract

Disclosed herein is a method to control distribution of injected microorganisms, nutrients or other chemical treatment fluids from a single injection well to multiple production wells. The sweep efficiency is improved preventing premature production of fluids from production wells with short breakthrough times. This is a useful technique for treatment of subterranean target sites for practice of Microbial Enhanced Oil Recovery and bioremediation.

Description

[0001] This application claims the benefit of US Provisional Patent Application 61 / 387494, filed September 29, 2010. technical field [0002] The present disclosure relates to the field of enhanced oil recovery or bioremediation. More specifically, it relates to controlling the flow of treatment fluids and / or microorganisms into subterranean formations for enhanced oil recovery or bioremediation. Background technique [0003] The primary techniques used in oil recovery utilizing only the natural forces present in the well site are capable of recovering only a fraction of the crude oil present in the oil reservoir. An oil well site is a location where an oil well has been drilled into an oil-bearing subterranean formation and is intended to produce oil from the formation. Reservoirs generally refer to underground deposits of petroleum in underground rock formations. Secondary oil recovery methods such as waterflooding, the process of injecting water into oil formations thro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/58
CPCC09K8/582E21B43/20
Inventor A.W.奥尔索普S.C.杰克逊
Owner EI DU PONT DE NEMOURS & CO
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