Reagent for removing asphaltene-tar-paraffin deposits and a method for treating well bottom zone utilizing it

FIELD: oil and gas production.

SUBSTANCE: reagent contains fraction obtained in processing of liquid products from oil feedstock pyrolysis via rectification of these products within a temperature range of 28 to 150°C at atmospheric pressure and in presence of polymerization inhibitors; and optionally polyalkylbenzene resin in amount 0.5-5.0% separately or in mixture with α-olefin 2.0-8.0%), or with anionic surfactant (0.05-0.2%). Reagent may also further contain 0.5-5.0% α-olefins and 4.0-10.0% butylbenzene fraction. Method of treating well bottom zone comprises injecting hydrocarbon fluid containing above-indicated hydrocarbons, forcing it into formation with buffer liquid, holding it in bottom zone for a wale, and drawing off dissolution products.

EFFECT: enhanced dissolution of asphaltene-tar-paraffin deposits on oil-field equipment and in well bottom zone and prevented re-precipitation of asphaltenes.

EFFECT: 5 cl, 3 tbl

 

The invention relates to the oil industry and can be used to remove asphaltene-resin-paraffin deposits (ARPD) of oilfield equipment and the bottom zone of the well.

Known composition for removing oil deposits, including hexane, ethylbenzol fraction (see ed. mon. No. 1620465, MKI 09 To 3/00, E 21 In 37/06,1991).

The disadvantage is low efficiency compared to paraffin in a wide range of content of asphaltenes, resins and waxes.

Known composition to remove asphaltene-resin-paraffin deposits, including heavy resin pyrolysis gasoline, wikipaedia 150°and hexane fraction (see ed. mon. No. 1756328, MKI 09 To 3/00, 1992).

Known composition is not effective enough due to having a low dissolving ability in relation to ARPD.

Closest to the claimed reagent is a composition for removing asphaltene-resin-paraffin deposits, including by-product of the petrochemical production - hexane fraction or a product of oil refining - reagent-2" - 25-75 wt.%, monoalkyl ether of polyethylene glycol on the basis of primary fatty alcohols or ethoxylated isononylphenol with a degree of oksietilirovannye 9-12 0.5 to 5.0 wt.% and a byproduct of organic synthesis based on aromatics is their hydrocarbons (see RF patent №2131901, MKI 09 To 3/00, E 21 In 37/06, 1999).

However, this composition is not effective enough to remove deposits with a high asphaltene content and inorganic components.

Closest to the claimed method is a method of bottomhole zone treatment wells producing heavy oil and natural bitumen, including the injection of hydrocarbon fluid is a mixture of light pyrolysis resins or products based on it λ-olefins, punching her in the reservoir buffer fluid, maintaining the bottomhole formation zone and the removal of the products of dissolution, the subsequent injection of the alkaline solution, maintaining the bottomhole formation zone and the removal of reaction products, and the injection of the reactants and removal of products of dissolution and reaction is carried out in a repressive-depression wave mode with a frequency of 1-400 Hz (see RF patent №2162517, MKI E 21 In 43/22, 37/06,2001).

The disadvantage of this method is a multi-stage and low success of the bottomhole zone treatment.

The task of the invention is to develop a more effective reagent for removal of deposits with a high content of resin-asfaltenovyh component that allows a simultaneous increase in the capacity of dissolving paraffin to prevent subsequent deposition of asphaltenes, as well as processing method wellbore zones is complicated by the loss of deposits with the use of the reagent.

The task is solved by providing a reagent for the removal of sediment containing organic synthesis product, as a product of organic synthesis, it contains a fraction of the processing liquid pyrolysis products of crude oil, obtained by distillation in the temperature range 28-150°at atmospheric pressure in the presence of polymerization inhibitors.

The reagent may further comprise polyalkylbenzene resin in the amount of 0.5 to 5.0 wt.%. separately or together with α-olefin in an amount of 2.0 to 8.0 wt.%. or in combination with anion active surface active substance in an amount of 0.05-0.2 wt.%.

The reagent may further contain α-olefins in the amount of 0.5 to 5.0 wt.%. and butylbenzene faction in the amount of 4.0 to 10.0 wt.%.

The problem is solved by creating a method of processing bottom-hole zone of the well, including the injection of hydrocarbon liquids, pushing her into the bed of the buffer fluid, maintaining the bottomhole formation zone and the removal of the products of dissolution, as the hydrocarbon fluid using the above reagents to remove asphaltene-resin-paraffin deposits.

When distillation of liquid products of pyrolysis oil feedstock in the temperature range 28-150°With formed product of the following composition, wt%:

aromatic hydrocarbons - 35-3

naphthenic hydrocarbons - 21-25

the linear hydrocarbon - 31-37

hexanol-1 - 1-2

unidentified

components - the rest.

The composition of the resulting product is examined by gas chromatography spectrometry instrument YC-US "Perkin - Elmer" with quadrupole mass analyzer and data processing system "Turbo Mass Yold 4.3".

Upon receipt of the reagent and to give it resistance to resinification at elevated formation temperatures using polymerization inhibitors, which are used hydroquinone (paradoxians) TU 19627-74 or salt of copper, such as copper naphthenate on THE 6-09-07-1383-84 or odnoglazuu copper according to GOST 4164-79.

The introduction of additives in the product processing depends on the composition of deposits.

When the content of asphaltenes to 55% of the additive is not required when the content of asphaltenes more than 55% add polyalkylbenzene resin, with increased content of asphaltenes and paraffins add polyalkylbenzene resin and α-olefins, and if the composition of deposits increased tar and water, in addition to polyalkylbenzenes resin type of anion active surface active substance (AS), at about the same content in the composition of deposits asphaltenes, waxes and resins add α-olefins and butylbenzene faction.

For preparation of the reagent using the following ingredients: polyalkylbenzene resin on THE 38 10298-83, α-olefin fraction With6on THE other 2411-059-05766801-96, butylbenzene fraction on THE 38-10297-78, as ASAS use condensation products of VAT residue production of synthetic fatty acids or oleic acid with triethanolamine (see rahmankulov D.A., and other Chemical reagents in the extraction and transport of oil. Reference edition. M:Chemistry, 1987, p.70).

The additive is introduced into the product by simple mixing.

The proposed method is as follows.

In the bottom zone of the well pump reagent. The amount of reagent used is determined from data on the effectiveness of the thickness of the perforation interval, taking into account the capacitive properties of the reservoir and the radius of the processing by the formula:

where: VP3- a volume of reagent, m3,

H is the effective thickness of the reservoir, m,

m - porosity,

KN is the coefficient of saturation.

Next, the reagent is forced into the reservoir buffer fluid. When processing bottomhole injection wells as a buffer liquid use water, in the treatment of bottom-hole zone of the production well using oil. The reagent is kept in a reservoir within 24 hours. Next, make the removal of the products of dissolution. When processing bottomhole injection wells removal of the products of dissolution is made by creating depress and, while processing a bottomhole producing wells resume well and dissolution carried out of the wells produced products.

From the patent and scientific literature we are not aware of reagents for removal of deposits containing the claimed set of features that allows you to draw a conclusion about the novelty of the claimed technical solution

The presence in the invention a higher drop ASPO properties along with high dispersing ability and due to the fact that the current level of technology is not aware of the existence of the reagent and method with similar properties, we can conclude about the relevance of the proposed technical solutions to the criterion of "inventive step".

The effectiveness of the proposed reagent determined on samples of paraffin from oil wells Romashkinskoye field. Group composition of the studied samples of sediment are presented in table 1.

Table 1
No. p.pNo. of sample ARPDThe composition of deposits, % wt:
WaterThe mineral partAsphaltenesResinWaxes
1.17,1 7,339,732,613,3
2.24,22,947,325,420,2
3.38,89,260,113,08,9
4.45,13,244,0of 5.442,3
5.5a 4.95,230,829,530,6
6.613,78,128,827,222,2

The proposed reagent experience on the removal efficiency of sediment gravimetric method. For this sample paraffin heated to a temperature grinding and mix thoroughly. The resulting homogeneous mass is formed sample ASPO, cool for two hours, then placed in a pre-weighted basket of brass mesh with a cell size of 1.5×1,5 mm Weight of sample ASPO within 3, the Size of the baskets 70×15×15 mm Mesh sample is again weighed and found the weight of deposits with an accuracy of 0.005, the Basket with the sample placed in a sealed glass cell where pour 60 ml of investigational reagent. The static mode, the duration is contact 3 hours, the temperature of the experience of the support 25° accuracy ±0,5°C. the Basket with the remaining paraffin is extracted, dried to a constant weight, which is fixed. The removal efficiency of sediment calculated by the formula:

where M1, M2the mass of the sample) before and after the experiment,

Used in the experiment reagent is filtered through pre-weighted filter, which together with the dispersed part of ASPO dried to constant weight. Dispersing ability of the reagent is evaluated by the formula:

where M3- the weight of a sample of sediment remaining on the filter was

The results of the experiments are shown in table 2.

As can be seen from table 2, when the same part of ASPO, the inventive reagent more effectively disperses and dissolves paraffin.

Determining the effectiveness of the proposed reagent for removing paraffin from a well bottom-hole zone is performed using a bulk linear reservoir models, which is a metal tube with a length of 0.5 m and a diameter of 0.03 m, filled with compacted porous medium from ground quartz sand. Through the model with a dry porous medium specific permeability, pre-weighted, pumped water up to one hundred the waste utilization technologies filtration rate. The model will then weighed again to calculate the first volume. Forth on the reverse side of the model pumped sample ARPD and resume pumping the water. In the course of the experiment to determine the rate of filtration of a liquid prior to injection ARPD(V1and after the injection of paraffin (V2)

The criterion of the degree of filtration of a fluid in the model is a factor of relative changes in mobility (Q1)defined by the formula:

where λ1thatλ2- the mobility of the fluid before and after injection of deposits, respectively, μm2/NS, which is determined by the formula Darcy:

where V1V2- speed filtering the fluid before and after the injection of paraffin, ms.,

ΔR, Δp1- the pressure drop across the inlet and outlet of the model, m/sec.,

K - constant.

Later in the model pumped analyzed reagents and leave a response within 24 hours. Resume pumping the water to stabilize the filtration rate and calculate the factor of relative changes in mobility (Q2after injection of the reagent. The criterion of efficiency is the growth factor of relative changes in mobility before and after injection of the reagent: ΔQ=Q2-Q1. Thus determine the impact of the proposed reagents to samples ASPO different structuresstate. The research results are summarized in table 3.

The use of the reagent and method ensures high efficiency of the bottomhole zone treatment, complicated by the loss of deposits.

1. Reagent for removal asphaltene-maloperation sediments containing organic synthesis product, characterized in that the product quality of organic synthesis, it contains a fraction of the processing liquid pyrolysis products of crude oil, obtained by distillation in the temperature range 28-150°at atmospheric pressure in the presence of polymerization inhibitors.

2. The reagent according to claim 1, characterized in that it further comprises polyalkylbenzene resin in the amount of 0.5-5.0 wt.%.

3. The reagent according to claim 2, characterized in that it additionally contains α-olefins in an amount of 2.0 to 8.0 wt.% or anion active surface active substance in an amount of 0.05-0.2 wt.%.

4. The reagent according to claim 1, characterized in that it additionally contains α-olefins in the amount of 0.5-5.0 wt.% and butylbenzene faction in the amount of 4.0-10.0 wt.%.

5. The method of processing bottom-hole zone of the well, including the injection of hydrocarbon liquids, pushing her into the bed of the buffer fluid, maintaining the bottomhole formation zone and the removal of the products of dissolution, characterized in that as Ugledar the ne of the liquid used reagent according to claims 1-4.



 

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