Solid foaming agent for removal of liquid from bottom hole

FIELD: oil and gas industry.

SUBSTANCE: solid foaming agent for removal of liquid from bottom hole, which is obtained using ammonium carbonate and surface active substances - non-ionic- OP-10 or OP-7 and anionic - sulphanole by formation of mixture and its solidification, where at ratio of OP-10 or OP-7 and sulphanole of 3.3-5.2:1.0 the mixture also contains Kolamid K; at that, mixture is prepared by mixing of OP-10 or OP-7, sulphanole and Kolamid K, by heating of the obtained mixture of up to 40-60°C, by its mixing till sulphanole is diluted, and then, by adding ammonium carbonate, at the following component ratio, wt %: OP-10 or OP-7 33.0-52.0, sulphanole 10, ammonium carbonate 0.2-0.5, and Kolamid K is the rest.

EFFECT: improving foaming efficiency and carry-over of high-mineralised waters in presence of gas condensate from bottom holes of low temperature gas and gas-condensate wells, and improving the manufacturability of solid bars - sticks.

3 tbl, 3 ex

 

The invention relates to the oil and gas industry and is intended to remove the fluid with a salinity of up to 200 g/l and a content of gas condensate in the mixture up to 50% with low-temperature downhole wells, mostly in the late stages of field development.

Known composition for removing fluid from the borehole bottom, containing, wt.%:

OP-1034,0-40,0
The sulfonic acidof 9.8 and 11.6
crystal sulfamic acid1,0-13,0
carbonate of sodium, potassium or calcium4,5-6,5
powdered lignosulfonaterest

(see RF patent №2223298, IPC7SC 7/08, EV 21/14, publ. 27.10.2003).

The disadvantage of foam formulations is that the gas is formed only in the process of interaction with water, in addition, it is formed only at the place of contact of water and rods (checkers) surfactant (hereinafter - surfactant), i.e. on the surface that leads to the necessity to use a large excess of sulfamic acid and carbonates. As can be seen from the above,a total content of 15-20 wt.%. In addition, formed by pressing checkers have low strength, due to the absence of binders, because pressing at high pressure is unacceptable because of the potential interaction of carbonates with solid sulfamic acid, furthermore, checkers is necessary to dry.

The closest in composition to the claimed invention and accepted us as a prototype is a composition for removing fluid from the borehole bottom, containing, wt.%:

OP 10 and OP-735,0-39,0
the sulfonic acid9,5-13,0
Kssb28,0-41,0
ammonium carbonate13,0-16,0
phosphate of an alkali metal1,5-4,0

(see RF patent №2109928, IPC EV 43/00, 37/06, publ. 27.04.1998).

The disadvantage of foam formulations adopted us as a prototype, is the lack of efficiency of removal of fluid from downhole low-temperature gas and gas condensate wells, because the ammonium carbonate decomposes to form gaseous substances (NH3and CO2)that helps u is the application of this surfactant on the interface of liquid water the condensate, only at elevated temperatures (+5°). At temperatures below +5°C ammonium carbonate does not decompose, and the subsidence of this foam on the bottom, thus reducing the formation of foam and reducing the efficiency of the removal of the liquid.

The objective of the invention is to increase the efficiency of foaming and carryover of highly mineralized water in the presence of gas condensate from the bottom of the low-temperature gas and gas condensate wells and improvement of the efficiency of preparation of solid rods (checkers).

The task in the solid foaming agent to remove the liquid from the bottom of the borehole containing surfactant: nonionic OP 10 and OP-7 and anionic - sulfonic acid, is solved in that the ratio OP 10 and OP-7 and sulfonic acid 3,3-5,2:1.0 composition further comprises Kalumid To the following ratio of components, wt.%:

OP 10 and OP-733,0-52,0
the sulfonic acid10
Kalumidthe rest,

when this mixture is prepared by mixing the first OP 10 and OP-7, sulfonic acid and Kalamita To, heating the resulting mixture up to 40-60°C, mixing until dissolution sulfonic acid and then adding carbon is and ammonium.

Solid foaming agent is prepared by mixing of its components. For this purpose, in the capacity of a given amount of poured OP 10 and OP-7, add the sulfonic acid and Kalumid To, and then heat the mixture to a predetermined temperature, stirred until dissolution sulfonic acid and add the specified amount of ammonium carbonate. Next pour the mixture over the forms and allowed to cool to solidification, while receiving solid rods (checkers). Form of rods Packed in hard paper cylinders. Solid foaming agent is ready to use.

At a temperature of 40-60°C ammonium carbonate decomposes with evolution of ammonia and carbon dioxide bubbles which reduce the density of the solid foaming agent, i.e. the gas is at the stage of formation of the sticks and does not depend on conditions in the borehole, thus, checkers unlike analogue and prototype ready for use at any temperature and without additional drying.

For solid foaming agent selected nonionic amides of coconut oil (Kalumid K), which serve as a binder and enhance the foaming properties of the inventive solid foam. Kalumid To - monoethanolamide carboxylic acids of coconut oil with the chemical formula R-N-CH2CH2HE, where R is coconut alkyl.

Part cocosa the CSOs oil contains fatty acids, presented in table 1.

Table 1
The composition of coconut oil
Name fatty acidsContent, %
Lauric44
Myristic14
Dalmatinova10
Oleic7
Caprylic9
Capric9
Stearic3
Linoleic2
Arachnid1,5
Kaprova0,5

Kalumid produced according To THE 2433-013-04706205-2005 Scientific-production enterprise niipa, Volgodonsk.

The greatest sensitivity of all types of surfactants appears to hydrocarbons as foaming liquid deteriorates with the increase of their content and becomes unsatisfactory disneyonline surfactant OP-10, OP 7 or Kalumid To) in their content above 50 wt.%, and for anionic (sulfonic acid) - above 15-20 wt.%" (see abstract of a thesis for obtaining the academic degree of Cand. technology. Sciences. Technology recovery and improve the performance of gas wells. Mazanov SV Stavropol, 2006, 27).

The increased mineralization of the liquid greatly reduces foaming for ionic surfactants, for example anionic surfactants, interacting in mineralized water with salts of calcium and magnesium precipitate. Nonionic surfactants do not change their characteristics even in highly saline solutions.

The use of a mixture of anionic and nonionic surfactants, with a high content of the latter, allows to obtain a system is practically insensitive to the effect of salinity and gas condensate at the ratio OP 10 and OP-7 and sulfonic acid 3,3-5,2:1.

The location of the solid foaming agent with the claimed composition at the interface of liquid water condensate is caused by the density of rods, which is lower than the density of water. Thus, the piece being in the working area of the perforation intervals, gradually dissolves, which promotes a more efficient foaming and carryover of liquid.

Example 1. In the capacity fill a specified number of OP-10 to 40 wt.%, add 9.8 wt.% sulfonic acid and 50 wt.% Calamita To, heating the t mixture to a temperature of 40°C, stir to dissolve sulfonic acid, add 0.2 wt.% of ammonium carbonate and poured into forms. Allow to cool until hardened. Form of rods (checkers) are Packed in hard paper cylinders. When using cylinders open, and the rods through the lubricator serves on the bottom.

Example 2. In the capacity fill a specified number of OP-7 50 wt.%, add to 9.6 wt.% sulfonic acid and 40 wt.% Calamita To heat the mixture to a temperature of 50°C, stirred to dissolve sulfonic acid, add 0.4 wt.% of ammonium carbonate and poured into forms. Allow to cool until hardened. Form of rods (checkers) are Packed in hard paper cylinders. When using cylinders open, and the rods through the lubricator serves on the bottom.

Example 3. In the capacity fill a specified number of OP-10 to 35 wt.%, add 10 wt.% sulfonic acid and 54.5 wt.% Calamita To heat the mixture to a temperature of 60°C, stirred to dissolve sulfonic acid, add 0.5 wt.% of ammonium carbonate and poured into forms. Allow to cool until hardened. Form of rods (checkers) are Packed in hard paper cylinders. When using cylinders open, and the rods through the lubricator serves on the bottom.

The effectiveness of solid surfactants was evaluated by the number of submitted liquids with different salinity solutions of salts of Na+, Ca2+, Mg2+ and the content of gas condensate in the mixture is at room temperature.

The results of laboratory studies and field tests showed that the claimed solid foaming agent to remove fluid from the borehole bottom in comparison with the prototype has better foaming capacity, does not require additional drying (see table 2 and 3).

Table 2
The results of laboratory studies of the proposed structure for removal of fluids
№ p/pComponent composition, wt.%The composition of the removed liquidThe volume of submitted fluid, %
OP-10/7the sulfonic acidKalumidammonium carbonatewaterthe condensate, %
volume %mineralization, g/l
1409,8500,210050 100
2409,8500,2805020100
3409,8500,2501005099
4409,8500,2502005099
5509,6400,410050100
6509,6400,48050 20100
7509,6400,4501005098
8509,6400,4502005097
93510,653,90,5805020100
103510,653,90,5501005098
113510,653,90,550200 5098

Table 3
The results of laboratory tests of the prototype for removal of fluids
№ p/pComponent composition, wt.%The composition of the removed liquidThe volume of submitted fluid, %
OP-10/7sulfa
Nol
Kssbsodium phosphateCarbo
NAT
ammo
of
waterthe condensate, %
volume %mineraliza
tion, g/l
138134041510050100
280 502096
350505096
4501005093

The use of the proposed structure improves the efficiency of removal of fluid with high salinity (up to 200 g/l) and the content of gas condensate in the mixture (up to 50%) from the bottom of the low-temperature gas and gas condensate wells, improve depression on the formation and increase the rate of production wells, which is especially important in fields with abnormally low formation pressure.

Solid foaming agent to remove fluid from the borehole bottom, obtained with the use of ammonium carbonate and surfactants - nonionic - OP 10 and OP-7 and anionic - sulfonic acid by forming mixture and curing, characterized in that the ratio OP 10 and OP-7 and sulfonic acid 3,3-5,2:1.0 mixture additionally contains Kalumid To, the mixture is prepared by mixing the first OP 10 and OP-7, sulfonic acid and Kalamita To, heating the resulting mixture up to 40-60°C, mixing until dissolution sulfonic acid and then the addition of carbonate of ammo the Oia in the following ratio of components, wt.%:

OP 10 and OP-733,0-52,0
the sulfonic acid10
ammonium carbonate0,2-0,5
Kalumidrest



 

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