The method of preventing the formation of oil deposits

 

(57) Abstract:

The invention relates to the oil industry, in particular to a method of preventing the formation of asphalt, resin and paraffin deposits in the tubing of the well due to the effective application of magnetic fields, and can be used to improve the operating parameters of the well and increase its masochisthalo period. The method is carried out in the following sequence. At the site chosen production well, the operation of which is complicated by the process of the formation of deposits on the walls of the tubing and, therefore, frequent repairs and leaching, i.e. short mesocotyl period (MOS). Determine the density of the produced fluid and composition of produced gas. From these data, calculate the interval degassing of low-molecular components associated petroleum gas. Then put the magnetic device in the tubing to a depth corresponding to the lower and upper bounds of this interval. Carry out the necessary startup and enter the well into operation. Effect: increase oil production 1.75 times, increase masochisthalo period of 5.8 - 7 times, reduced procurement costs and the sufficiency of the.

The invention relates to the oil industry, in particular to a method of preventing the formation of asphalt, resin and paraffin deposits in the tubing of the well due to the effective application of magnetic fields, and can be used to improve the operating parameters of the well and increase its masochisthalo period.

Known way to prevent ASPO by creating a hydrophilic layer on the surface of the equipment by pumping water Hydrophilidae composition (polyacrylamide and liquid glass) [see C. E. Gubin and other Results of experimental-industrial tests of the wetting compositions in the extraction of petroleum oil, RNTs niyang/Neftepromyslovoe case, 1975, N 4, S. 22].

Resulting from the processing of the wetting composition of the hydrophilic film protects the surface of the pipe from contact with oil, weakens the adhesion of paraffins, thereby reducing the risk of formation of paraffin sediments equipment.

The disadvantages of this method include, first, a short term hydrophilic film of the composition on the surface of the equipment due to the continuous contact of the raised products in the form of an emulsion, which b close to the proposed to the technical essence and the achieved result is the way, capable of handling the produced fluid by the magnetic field (see A., Malyshev and other "Selection of optimal ways of dealing with parageneratorov", Oil industry, No. 9, 1997, S. 62).

The known method of preventing the formation of deposits provides for the transmission of fluid flow through a constant magnetic field created by the device based on permanent magnets, the so-called magnetic activators. They represent the tubing (tubing) with an external casing in which are placed the magnets. When the downhole movement of products through a magnetic field is formed an electric field sufficient to dipole orientation and changes in the characteristics of precipitation of wax crystals on the surface of the pipe, resulting in preventing the formation of oil deposits.

The method eliminates the use of chemicals and electricity.

However, the effectiveness of magnetic treatment decreases with the increasing content in the stream of particulate matter, gas, water droplets, as well as decreasing the viscosity of the oil.

Solved the technical problem is that you want to create a way to prevent the image

The aim of the invention is to increase oil production and increase masochisthalo period (MOS) by increasing the efficiency of magnetic treatment.

This goal is achieved by the described method of preventing the formation of deposits, including the processing of the produced fluid by a magnetic field.

What's new is that the processing of the magnetic field carried out before and after the interval degassing of low-molecular components associated gas, while the upper and lower bounds are determined by the formula:

< / BR>
where H is the depth of the location of the upper (lower) boundary of degassing, m; P is the pressure at which it starts (4,85 MPa) and ends (3,29 MPa) process for the degassing of low-molecular components associated gas, MPa; Pbufbuffer pressure, MPa;fthe density of the produced fluid, kg/m3.

Analysis of the known similar solutions allows to make a conclusion about the absence of these signs, similar to the distinctive features in the claimed method, i.e. the compliance of the decision criterion of "significant differences".

The method is performed in the following sequence.

At the site chosen by them, frequent repairs and leaching, i.e. short mesocotyl period (MOS). Determine the density of the produced fluid and composition of produced gas. From these data, calculate the interval degassing of low-molecular components associated petroleum gas. Then put the magnetic device in the tubing to a depth corresponding to the lower and upper bounds of this interval. Carry out the necessary startup and enter the well into operation.

Magnetic treatment of the produced fluid in the proposed method prevents the formation of deposits in the formation of microcrystalline paraffin in the liquid volume with subsequent flotation removal of their gas bubbles in the interval degassing. Suspended in a mixture of crystalline particles do not have the ability to adhere to the pipe walls and to form a solid continuous accumulation of sediment.

Due to the location of the magnetic activators outside the interval degassing oil eliminates the negative impact of gas on the effectiveness of magnetic treatment.

Thus, implementation of the proposed method efficiently with a minimum expenditure of material and technical orconcrete complete method.

The method was tested in field conditions in several fields of JSC "Tatneft".

Chose well N 21003, located on Almetyevsk square. Work well complicated intensive process of asphalt, resin and paraffin deposits substances on the walls of the tubing. During the year the well was washed 4 times and once was an underground repair. Megacity period (MOS) was 78 days.

Analysis of associated petroleum gas this well showed that the major low-molecular components are methane - 41%, ethane - 24,1%, propane - 16,5%, n-butane and 3.6%. The degassing of these gases occurs in the range where the liquid column in the tubing creates a pressure P = 4,85-3,29 MPa. Lower and upper bounds (H) interval degassing of low-molecular components associated gas is determined by the formula:

< / BR>
where P is the pressure at which it starts (4,85 MPa) and ends (3,29 MPa) process for the degassing of low-molecular components associated gas, MPa; Pbufbuffer pressure of 2.5 MPa;fthe density of the produced fluid, equal to 925 kg/m3.

The calculation results showed that the lower bound of the interval for degassing wells 21003 is at a depth of 254 m, and the upper 85 m Priebe MOS increased 5.8 times, i.e. amounted to 452 days. During this period there was no wash well, were saved 80 t of distillate, excluded shipping cost.

On the North-Almetyevsk square was chosen well N 14806. MOS was equal to 105 days. The gas analysis showed that its composition is the same as in SLE. N 21003. The density of the produced fluid 925 kg/m3buffer pressure of 0.4 MPa. The calculations showed that the interval degassing is at a depth of 307 - 481 m Magnetic activators were lowered to 300 and 490 feet After a well worked without leaching and repairs within 730 days, the MOS has increased 7 times. During this period, average daily rate increased 1.75 times and was produced 6353 tons of additional oil.

For comparison on the same field under comparable conditions the experiment was chosen well N 12460 (West Leninogorsk square) [prototype] . Megacity period of this well was 34 days,f= 923 kg/m3Pbuf= 0.8 MPa. The component composition of the gas is the same as in the wells described above. The estimated interval degassing 270 - 439 m Lowered the magnetic actuator in this interval at a depth of 350 m In the MOS has not changed.

At another well N 10131 (North who tore the degassing (calculated value - 236 - 405 m) to a depth of 900 m In the MOS amounted to 91 days, i.e. almost did not change.

Comparative analysis of the prototype showed that the proposed method improves the average daily oil production rate 1.75 times, and megacity period of 5.8 to 7 times.

Technical and economic efficiency of the proposed method of preventing the formation of deposits formed as by increasing oil production 1.75 times and increase masochisthalo period of 5.8 to 7 times, and lower costs for the purchase and delivery of the reagent for rinsing wells, excluding operations associated with ascent and descent deep equipment.

The method of preventing the formation of oil deposits, including the processing of the produced fluid by a magnetic field, characterized in that the processing of the magnetic field carried out before and after the interval degassing of low-molecular components associated gas, while the upper and lower bound it is determined by the formula

< / BR>
where P is pressure, when ktoroy begins and ends the process of degassing of low-molecular components associated gas, MPa;

Pbufbuffer pressure, MPa;

fthe density of the produced fluid is

 

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FIELD: oil extractive industry.

SUBSTANCE: device has pit-face cutting valve and mounting tool. Cutting valve has body, packer with check valve and perforated tail. Mounting tool has hollow rod, connected by shear elements to expanding cone of packer, lower and upper bodies. Lower body is provided with self-compacting collar, and upper - through tubing string of limited volume and sleeve is connected to drop valve cylinder. Valve rod is connected to rope, on which device is lowered into well. Hollow rod and tubing string form depression chamber being at constant atmospheric pressure. Rod has upper and lower shelves. On shelf of upper body expander of self-compacting collar having longitudinal grooves is mounted. After raising of mounting tool from well packer, body with tail and check valve remain in it. Then a pump is lowered into well.

EFFECT: lower costs.

3 dwg

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