RO118964B1

RO118964B1 - Foam generating solid product with controlled density and energizing effect

Info

Publication number: RO118964B1
Application number: RO97-00759A
Authority: RO
Inventors: Neculai Pavlovschi; Marioara Florea; Grigore Becea
Original assignee: Romgaz S.A.
Priority date: 1997-04-21
Filing date: 1997-04-21
Publication date: 2004-01-30

Abstract

The invention relates to obtaining a foam generating solid product, with variable density controlled by adjusting the casting temperature and by pressure casting a melted and aerified mixture, comprising alkylphenolpolyethoxylates, hydrosoluble polymers of polyethylenglycol type with high molecular weight and energizing agents of carbide or calcium hydride type, meant for producing abundant light and stable foams, inside the gaseous hydrocarbon wells, together with the formation water. These foams determine the recommencement of production of the flooded wells, or increasing the flow of those with low production, because the foams once formed substantially reduce the hydrostatic load acting on the productive layer by the formation water accummulated at the bottom of the borehole.

Description

RO 118964 ΒRO 118964 Β

Invenția se referă la un produs spumogen solid, cu densitate reglată și acțiune energizantă, destinat măririi producției sondelor de hidrocarburi gazoase, prin producerea, împreună cu apa de zăcământ, a unor spume abundente, ușoare și stabile, precum și la un procedeu de obținere a acestui produs.The invention refers to a solid foaming product, with regulated density and energizing action, intended to increase the production of gas hydrocarbon wells, by producing, together with the reservoir water, abundant, light and stable foams, as well as to a process for obtaining this product.

Aceste produse spumogene determină repunerea în producție a sondelor inundate sau mărirea debitului celor care produc slab, datorită faptului că spumele o dată formate reduc substanțial sarcina hidrostatică ce se exercită asupra stratului productiv de către apa de zăcământ, acumulată la talpa sondei, sau de apa care se deplasează sub formă de dopuri către suprafață.These foaming products determine the resumption of production of flooded wells or the increase of the flow of those that produce poorly, due to the fact that the foams once formed substantially reduce the hydrostatic load exerted on the productive layer by the reservoir water, accumulated at the bottom of the well, or by the water that it moves in the form of plugs to the surface.

Sunt cunoscute produse spumogene realizate pe bază de agenți tensioactivi liposolubili, de tip ionic sau neionic, sub formă lichidă sau sub formă de batoane solide, ambalate în tuburi de carton, introduse în sondă prin pompare, respectiv prin cădere liberă.There are known foaming products based on fat-soluble surfactants, of the ionic or non-ionic type, in liquid form or in the form of solid bars, packed in cardboard tubes, introduced into the well by pumping, respectively by free fall.

Produsele menționate prezintă următoarele dezavantaje:The mentioned products present the following disadvantages:

- nu pot genera procesul de spumare într-un număr important de cazuri cum ar fi sondele inundate la care nu există condiții de agitare datorită absenței gazelor în mișcare;- they cannot generate the foaming process in a significant number of cases such as flooded wells where there are no stirring conditions due to the absence of moving gases;

- densitatea variabilă realizată prin modelarea formei geometrice și turnare la presiune atmosferică în tuburi de carton conferă rezistență mecanică redusă în timpul manipulării și la introducerea în sondă;- the variable density achieved by modeling the geometric shape and casting at atmospheric pressure in cardboard tubes confers reduced mechanical resistance during handling and when inserting into the well;

- procedeul de turnare în tuburi de carton verticale determină pierderi de material activ la îndepărtarea ambalajului de carton în momentul utilizării, pierderile medii fiind estimate la 2...2, 5% din greutate.- the casting process in vertical cardboard tubes causes losses of active material when removing the cardboard packaging at the time of use, the average losses being estimated at 2...2.5% of the weight.

Produsul spumogen solid, cu densitate reglată și acțiune energizantă, conform invenției, înlătură aceste dezavantaje prin aceea că se prezintă sub formă de batoane având o lungime de 300...400 mm, cuprinzând un sistem de goluri necomunicante, realizate prin barbotare de azot printr-un sistem de tuburi capilare, în masa topită a unui amestec de alchilfenolipolietoxilați cu grad de etoxilare cuprins între 9 și 40, și polietilenglicol cu greutate moleculară 4000, amestec care, după turnare sub presiune, este supus răcirii, în vederea solidificării, debitării, găuririi mecanice în interior și umplerii cu hidrură sau carbură de calciu.The solid foaming product, with regulated density and energizing action, according to the invention, removes these disadvantages in that it is presented in the form of bars with a length of 300...400 mm, comprising a system of non-communicating voids, made by bubbling nitrogen through - a system of capillary tubes, in the molten mass of a mixture of alkylphenolpolyethoxylates with a degree of ethoxylation between 9 and 40, and polyethylene glycol with a molecular weight of 4000, a mixture which, after casting under pressure, is subjected to cooling, with a view to solidification, cutting, mechanical drilling inside and filling with calcium hydride or carbide.

Produsul spumogen solid, conform invenției, prezintă următoarele avantaje:The solid foam product, according to the invention, has the following advantages:

- are în compoziție, pe lângă agenți tensioactivi polietoxilați, polietilenglicol cu greutate moleculară mare și agenți energizanți de tip carbură de calciu sau hidrură de calciu, care, în timpul dizolvării substanțelor tensioactive vin în contact cu apa, reacționând energic și eliberând un gaz (acetilenă sau hidrogen) care asigură condițiile de agitare și de generare a spumei;- has in its composition, in addition to polyethoxylated surfactants, high molecular weight polyethylene glycol and energizing agents such as calcium carbide or calcium hydride, which, during the dissolution of the surfactants, come into contact with water, reacting energetically and releasing a gas (acetylene or hydrogen) that provide the conditions for agitation and foam generation;

- are în compoziție, în proporție variabilă, un gaz (azot) uniform dispersat în masa amestecului, ceea ce determină o structură de mici goluri necomunicante (volumul golurilor reprezentând între 15 și 30% din volumul produsului) și asigură realizarea unor densități variabile, controlate, în condițiile unei rezistențe mecanice superioare;- has in its composition, in a variable proportion, a gas (nitrogen) uniformly dispersed in the mass of the mixture, which determines a structure of small non-communicating voids (the volume of the voids representing between 15 and 30% of the product volume) and ensures the achievement of variable, controlled densities , under the conditions of a superior mechanical resistance;

- structura poroasă este creată prin barbotarea azotului în masa produsului spumogen aflat în stare topită, printr-un sistem de tuburi capilare, și reglarea corespunzătoare a temperaturii amestecului;- the porous structure is created by bubbling nitrogen into the mass of the foamy product in a molten state, through a system of capillary tubes, and the appropriate regulation of the temperature of the mixture;

- turnarea produsului spumogen se face la o presiune superioară celei atmosferice, în tuburi de polietilenă de joasă densitate, cu perete subțire, cu lungimea de 3...5 m și un diametru de 35...40 mm, care, după răcirea și solidificarea compoziției, se taie la lungimea dorită (300...400 mm).- the foaming product is poured at a pressure higher than atmospheric, in low-density polyethylene tubes, with a thin wall, with a length of 3...5 m and a diameter of 35...40 mm, which, after cooling and solidification of the composition, cut to the desired length (300...400 mm).

în continuare se prezintă 2 exemple de realizare a produsului, conform invenției.2 examples of the product according to the invention are presented below.

Exemplul 1. într-un vas prevăzut cu manta de încălzire, agitator și sistem de tuburi capilare pentru barbotare, prin insuflare de azot se introduc: 80 kg nonilfenol- polietoxilat cu grad de etoxilare 40,12 kg nonilfenolpolietoxilat cu grad de etoxilare 9 și 8 kg polietilenglicol cu greutate moleculară 4000.Example 1. in a vessel equipped with a heating jacket, a stirrer and a system of capillary tubes for bubbling, by blowing nitrogen, introduce: 80 kg of nonylphenol polyethoxylate with a degree of ethoxylation 40.12 kg of nonylphenol polyethoxylate with a degree of ethoxylation 9 and 8 kg polyethylene glycol with molecular weight 4000.

Claims

RO 118964 Β

The mixture is melted at 70,...80°C, stirred for homogenization and cooled by nitrogen bubbling, at a temperature between 40 and 50°C, with a flow rate of 4 - 5 l/min, using a tube system capillaries, until a uniform mixture is achieved in the form of a foam. The mixture made in this way is poured at a pressure higher than atmospheric (300...1000 mm water column), in polyethylene film tubes with a length of 55 3...4 m and a diameter of 35... 40 mm, and after cooling and solidification in ambient conditions, or through an accelerated cooling system (water, refrigerant), it is cut into bars with a length of 300...400 mm and packed in cardboard boxes , being ready for use. The specific gravity of the product is adjusted as necessary, depending on the amount of nitrogen, the temperature of the mixture and the bubbling time being between 0.85 g/cm ³ and 0.95 g/cm ³ . 60 if the product is made without nitrogen addition, the specific weight is 1.10...1.25 g/cm ³ .

The foaming characteristics determined according to STAS 5774/68, for a 1% foaming solution in salt water with 200g/l salt are the following: foaming power 260 cm ³ ; foam stability 0.946; foam density 0.017 g/cm ³ . 65

Example 2. The foam product obtained in example 1 having a length of 300...400 mm and a diameter of 35...40 mm is drilled inside with a suitable means (for example with a special drill), the hole having a diameter of about 20 mm. in the void thus formed, a quantity of 150...200 g of calcium hydride or calcium carbide, ground to a fineness of 40 mesh, is introduced, after which a melted material is added to the ends, having the same composition as the product original.

demand

1. Solid, microporous foaming product, with regulated density and energizing action, 75 based on non-ionic surfactants and calcium hydride or carbide, characterized by the fact that it is presented in the form of bars with a length of 300... 400 mm, comprising a system of non-communicating voids, made by bubbling nitrogen through a system of capillary tubes, in the molten mass of a mixture of alkylphenolpolyethoxylates with a degree of ethoxylation between 9 and 40 and polyethylene glycol with a molecular weight of 4000, a mixture which, after tur- 80 nare under pressure, is subjected to cooling, in order to solidify, cut, mechanically drill inside and fill with calcium hydride or carbide.

2. Product according to claim 1, characterized in that it has a variable density of 0.85...1.20 g/cm ³ , controlled by adjusting the casting temperature, bubbling time and pressure casting of the molten mixture at the temperature of 7O...8O°C and gas- 85 liver, in polyethylene foil tubes, arranged horizontally with a length of 3000...4000 mm and a diameter of 35...40 mm.

3. Product according to claims 1 and 2, characterized in that, when used, the addition of hydride or calcium carbide reacts with the reservoir water, releasing hydrogen, respectively acetylene, which initiates the foaming process, a process which is then accelerated 90 by the action gases existing in the deposit.

The president of the examination committee: chem. Haulica Mariela

Examiner: Eng. Florea Stela

Editing and computerized techno-editing - OSIM

Printed at: State Office for Inventions and Trademarks