Well flushing method

FIELD: oil and gas industry.

SUBSTANCE: well flushing method involves flushing with water solution of mixture of neonols AF9-12 and AF9-6; ratio of neonols AF9-12 and AF9-6 in mixture is 1:(4.5-5.5) respectively; water solution of mixture of neonols of 4.5-5.5% concentration is used; samples of asphalt-resin-paraffin deposits are pre-removed from the well and samples with undisturbed structure are taken; samples are built up on metal plates, submerged into the above solution and swelling time of samples by spectrophotometry method to balanced condition and the formation time of particles with asphalt-resin-paraffin deposits of minimum sizes in the flow of the above solution is determined, and bath of the above solution is arranged before flushing in the well; minimum time of bath is accepted equal to swelling time of samples to balanced state, and maximum time - during the formation period of time of particles with minimum sizes of asphalt-resin-paraffin deposits in flow of the above solution.

EFFECT: increasing well flushing efficiency.

3 ex, 1 tbl, 1 dwg

 

The invention relates to the oil industry and can be used when washing well.

Known washing composition for metal and painted surfaces containing (parts by weight) polyoxyethylene isononylphenol with a degree of oksietilirovannye 12-neonol AF9-12 1, ethoxylated isononylphenol with a degree of oksietilirovannye 6-neonol AF9-6 0,5-1, sodium tripolyphosphate, 0,1-2, sodium sulfate 0.1 to 2, water 8,3-2500. The composition used in the form of an aqueous solution. (Patent RF №2041258, publ. 09.08.1995).

Known detergent to clean the metal surface contains, wt%: ethoxylated malononitrile based on the trimer of propylene neonol AF9-12 3-4; neonol AF9-6 3-4; soda ash 29-45; trisodium phosphate 15-25; sodium tripolyphosphate to 100. The detergent used in the form of an aqueous solution. (Patent RF №2041927, publ. 20.08.1995 - prototype).

A disadvantage of the known technical solutions is not a high efficiency wash well.

In the proposed method solves the problem of increasing the efficiency of the wash well.

The task is solved in that in the method of leaching wells, including leaching with an aqueous solution of a mixture of neonols AF9-12 and AF9-6, according to the invention in a mixture ratio of neonols AF9-12 and AF9-6 set 1:(4,5-5,5), respectively the military, an aqueous solution of a mixture of neonols use 4,5-5,5%concentration, previously from a well to extract samples of oil deposits and produce samples with undisturbed structure, samples napravlyayut on metal plates immersed in the above solution and spectrophotometry to determine the swelling time of the samples to the equilibrium state and the time of education in the thread mentioned solution particles with a minimum size of oil deposits, and before rinsing well organize a bath of the above-mentioned solution, the duration of the bath is equal to the minimum time the swelling of the samples to the equilibrium state, and the maximum time education in the thread mentioned solution particles with a minimum size of oil deposits.

The invention

When washing the wells, kolmat ASPO, there is a danger or negoatiate deposits or clogging of pipes and valves at the wellhead large particles of loose sediments. Known technical solutions do not solve these questions, because it focused only on the dissolution of sediments. As a result, the washing efficiency of the well is low. In the proposed method solves the problem of increasing the efficiency of the wash well. The task is solved as follows.

Choose the ratio of neonols and the concentration of the solution. Conduct a series of experiments to launder ASPO at the ratios of neonols AF9-6 to AF9-12 from 1 to 10 to 10 to 1. As the main recording the effectiveness of their cleaning paraffin method was used spectrophotometry. Measure the optical density of the drilling fluids was performed on a spectrophotometer SF-102 at a wavelength of 540 nm. From wells to extract samples of sediment and produce samples with undisturbed structure. Samples napravlyayut on the metal plate without destroying the structure is dipped in the above solution and spectrophotometry to determine the turbidity of the solution. With the degree of turbidity of the solution is directly related to the degree of swelling ARPD. The results are summarized in table.

Build a graph of the dependence of the coefficient of light absorption of the solution with time (figure 1). The graph displays the dynamics of light transmission ratio (Ltr), where line 1 corresponds to a change of the PSC at the ratio AF9-6 to AF9-12 5 1, line 2, 3, 4, 5, 6, 7, 8, 9, 10 - accordingly, the ratio AF9-6 to AF9-12 equal to 4 to 1 3 to 1 2 to 1 1 to 1, 1 to 2, 1 to 3, 1 to 4, 1 to 5, 1 to 6, 1 to 7. As can be seen from the graph, the greatest detergent effect is achieved when the ratio AF9-12 to AF9-6 of 1 to 5. Because the technical result is achieved when the ratio of components in the range of 1:(4,5-5,5), then this is the value adopted as claimed.

Figure 1 mark the time when the absorption coefficient is almost ceases to change, which indicates the maximum swelling of the sediments. The graph on the curve 1 is 2 hours. This time is considered the minimum for the process of aging wells in mode baths. Further samples in the queue at time intervals is exposed to the flow of the solution and under a microscope to determine the particle size of the sediments, which breaks up the layer of sediments. Note that with increasing the exposure time, the particle size increases, which is undesirable. As always try to reduce the size of the particles washed out of the sediment to a minimum, then choose the best bath time when deposits swelled and able to collapse and when the particles of sediments by flushing formed small size, when they are able to pass through pipes and valves wellhead without danger to create a tube, clogging pipes. If the swelling time coincides with the optimal time to minimize the size of the particles when washing the wells, it is taken as the most optimal.

Thus, when washing the wells using 4,5-5,5%aqueous solution of a mixture of neonols AF9-12 and neonols AF9-6 when the ratio in the mixture of neonols AF9-12 and AF9-6 1:(4,5-5,5), respectively. As shown by preliminary investigated the I, such a solution with the same ratio neonols and this concentration is most effective when washing well.

When conducting operations, the borehole is filled with rinse solution, i.e. 4,5-5,5%aqueous solution of a mixture of neonols AF9-12 and neonols AF9-6 when the ratio in the mixture of neonols AF9-12 and AF9-6 1:(4,5-5,5), respectively, conduct technology exposure for swelling ARPD and appears to be washed out by the flow of solution and washed well with the same solution before full release well from ASPO.

In the result it is possible to wash the well from ASPO.

Examples of specific performance

Example 1. Perform flushing of the oil wells of paraffin. Determine that the swelling time ARPD samples to equilibrium state 4.5%aqueous solution of a mixture of neonols AF9-12 and neonols AF9-6 when the ratio in the mixture of neonols AF9-12 and AF9-6 1:4,5, respectively, is 2.3 hours Determines that the formation of the sediment particles with a minimum size of 0.5 mm when washing well with a stream of the same solution is also 2,3 h, i.e. coincides with the swelling time. This time is taken as optimum for the duration of the bath. Well fill a 4.5%aqueous solution of a mixture of neonols AF9-12 and neonols AF9-6 if the ratio in see the sea neonols AF 9-12 and AF9-6 1:4,5, respectively, conduct process exposure mode baths for swelling ARPD and appears to be washed out by the flow of solution within 2 to 3 hours and washed well with the same solution before full release well from ASPO.

Example 2. Perform flushing of the oil wells of paraffin. Determine that the swelling time ARPD samples to equilibrium in a 5%aqueous solution of a mixture of neonols AF9-12 and neonols AF9-6 when the ratio in the mixture of neonols AF9-12 and AF9-6 1:5, respectively, is 1.7 hours. Determine what time of particle formation sediments with a minimum size of 0.5 mm when washing the wells flow of the same fluid is 2 hours. Time 2 hours accepted as optimal for the duration of the bath. Well fill a 5%aqueous solution of a mixture of neonols AF9-12 and neonols AF9-6 when the ratio in the mixture of neonols AF9-12 and AF9-6 1:5, respectively, conduct process exposure mode baths for swelling ARPD and appears to be washed out by the flow of solution within 2 hours and washed well with the same solution before full release well from ASPO.

Example 3. Perform flushing of the oil wells of paraffin. Determine that the swelling time ARPD samples to ravnovesie the condition 5.5%aqueous solution of a mixture of neonols AF 9-12 and neonols AF9-6 when the ratio in the mixture of neonols AF9-12 and AF9-6 1:5,5, respectively, is 1.8 hours. Determine what time of particle formation sediments with a minimum size of 0.5 mm when washing well with a stream of the same solution is 1.9 hours. Time 1.8 hours to accept as optimal for the duration of the bath. Well fill a 5.5%aqueous solution of a mixture of neonols AF9-12 and neonols AF9-6 when the ratio in the mixture of neonols AF9-12 and AF9-6 1:5,5, respectively, conduct process exposure mode baths for swelling ARPD and opportunities arise to be blurred flow solution for 1.8 hours and washed well with the same solution before full release well from ASPO.

As a result, examples 1-3 are able to fully clean the borehole of paraffin. The application of the composition on the prototype showed the lowest laundering ability and the presence of residual deposits in the well after washing.

The application of the proposed method will allow to solve the problem of increasing the efficiency of the wash well.

Method wash well, including leaching with an aqueous solution of a mixture of neonols AF9-12 and AF9-6, characterized in that the mixture ratio of neonols AF9-12 and AF9-6 set 1:(4,5-5,5), respectively, water is actor mixture of neonols use 4,5-5,5%concentration, previously from the well to extract samples of oil deposits and produce samples with undisturbed structure, samples napravlyayut on metal plates immersed in the above solution and spectrophotometry to determine the swelling time of the samples to the equilibrium state and the time of education in the thread mentioned solution particles with a minimum size of oil deposits, and before rinsing well organize a bath of the above-mentioned solution, the duration of the bath is equal to the minimum time the swelling of the samples to the equilibrium state, and the maximum time education in the thread mentioned solution particles with a minimum size of oil deposits.



 

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