The method of complex impact on the bottom-hole zone of the well
(57) Abstract:The invention relates to the oil industry and can be used in the treatment of bottom-hole zone of the well. The method of complex impact on the bottom-hole zone of the well includes extraction from deep wells and pumping equipment, run in hole to bottom hole tubing. The borehole is filled with solvent asfaltosmesitelnyh sediments. Push the solvent and squeezing the liquid in the bottomhole formation zone. Down the heater. Heat the solvent in the perforation interval. Remove the heater and run the well into operation. As a solvent of oil deposits using an aqueous solution of 10% concentration of sodium bisulfate, 10% concentration of urea sodium and 0.5% concentration of sulfinol of 1 m31 m of the effective capacity of the reservoir. The heating of the solvent is carried out after his produce in the bottomhole formation zone. Before displacement solvent seal annulus. Increases the efficiency of processing bottom-hole zone of the well, increasing the productivity of the well. table 4. The invention relates to oil about the integral processing bottom-hole formation zone of the wellbore (PPP), includes filling the wells located on the site of the Deposit with low reservoir pressure, solvent asphalt, resin and paraffin deposits (ARPD), flushing and filling of the production string and the column tubing to a depth of descent of the pump with a solvent, the displacement of the downhole fluid solvent in the bottom zone to fill the wells of the solvent, the descent of the heater in the perforation interval and the heating of the solvent in the perforation interval to a temperature of 80-90oWith, removing the heater from the well, the displacement of the heated solvent oil in the bottom zone in the amount of 1.5-2.5 m3/m of the perforation interval, conducting technological shutter at the closed well within 12-24 h and running well in operation. As a solvent of oil deposits using solvent consisting of 3-6% solution in an organic solvent mixture of heavy pyrazolines resin and ciproxina in the ratio(9-11):1(1).Closest to the invention to the technical essence is the way complex impact on bottom-hole zone of the well, including the filling of the wells located on the site of the Deposit with low reservoir water tubing to a depth of descent of the pump with a solvent, the displacement of the borehole fluid solvent in the bottom zone to fill the solvent, the descent of the heater in the perforation interval and the heating of the solvent in the perforation interval to a temperature of 80-90oWith, removing the heater from the well, the displacement of the heater solvent oil in the bottom zone in the amount of 1.5-2.5 m3/m of the perforation interval, conducting technological shutter at the closed well within 12-24 h and running well in operation, when the solvent of oil deposits using 4-6% solution in oil mixture gasoline fraction with a content of saturated hydrocarbons WITH6-C8at least 50% and organic synthesis products based on aromatic hydrocarbons at a ratio by weight of 25-75:25-75, and technological shutter at the closed well within 12-24 hours performed during the initial set pressure at the wellhead of 2.5-3.5 MPa .A common disadvantage of the known technical solutions is their low efficiency when processing heavily kolmat bottom zones of the wells, because the proposed composition of low solvent effective in carbonate reservoirs.The invention solves the problem of the Mentioned task is solved by what in the way of complex impact on the bottom-hole zone of the well, including extraction from deep wells and pumping equipment, run in hole to bottom hole tubing, filling wells solvent oil deposits, the displacement of the solvent and squeezing the liquid in the bottomhole formation zone, the descent of the heater, the heating of the solvent in the perforation interval, removing the heater and run well into production, according to the invention as a solvent oil deposits using an aqueous solution of 10% concentration of sodium bisulfate, 10% carbamide concentration of sodium and 0.5% concentration of sulfinol of 1 m3within 1 m of the effective capacity of the reservoir and the heating of the solvent is carried out after his produce in the bottomhole formation zone, while before displacement solvent seal annulus.The use of compositions based bisulfate-modified urea, allows you to gradually affect the bottomhole formation zone. Immediately after injection the bisulfate begins to interact with the breed emitting gas, contributing to increased permeability.Status the walkie-talkie.The influence of hydrogen on the formation is soft, there is no rapid response, gas evolution during the reaction of dissolution is moderate. Use bisulfate compositions in the range of pH environments 1-3 avoids loss of secondary precipitation, which are formed at pH environment above four.The proposed composition of the solvent were subjected to laboratory tests.The effect of oil displacement the proposed composition of the solvent was estimated using the simplified method, based on standard methods (STF 0148070-012-91) "Methodology for conducting laboratory studies on the displacement of oil by chemicals", Sibniinp, Tyumen, 1991In accordance with the simplified method experiments on oil displacement are conducted without creating a reservoir pressure and high permeability reservoir models that can reduce the time of the experiment. Obtained in such conditions, the growth factors of oil displacement enables the effective rate oil-driving properties of the test compounds solvent.Evaluation of oil-driving properties of the compositions was carried out on the model of the heterogeneous reservoir. After substitution of oil by water in the model salacieli water, locking additionally eye-catching oil and measured the rate of filtration of a fluid to complete the stabilization process, i.e. before the termination of the discharge of oil, to establish a constant speed of liquid filtration.The results of laboratory tests of the compositions given in table. 1 shows that with increasing concentration of hydrogen in solution oil-driving properties of the compounds increase the rate of filtration of fluid by high permeability and low permeability of the layers increase. The results of laboratory testing shows that the best oil-driving properties of the composition with 10% content of sodium bisulfate, 10% content of urea sodium, 0.5% sulfinol. Increasing the concentration of sodium bisulfate and urea sodium by more than 10% is not economical, as it leads to a slight increase oil-driving properties.The influence of processes of thermal decomposition at elevated temperature effects on the composition of the solvent for a long time been studied but the following method.The compounds were divided into two groups depending on the concentration of hydrogen: the first group of 1-5% hydrogen; the second is 5 -10% of bisulfate.Was coermotibo within 24 hours periodically controlling the pH environment of the compositions. It was noted that the composition is able to maintain its reactionary properties within 24 hours in the temperature range 80o-120oC. the Results are given in table. 2.Based on the results placed in a table. 2, it can be concluded that:
a) compounds of destruction within 24 hours are not exposed. High temperature has a positive effect on the preservation of the reactivity of compounds that can be noted but stable condition pH environment.b) salinity in small concentrations, negative impact on the stability of compositions has not.Use bisulfate compositions in the range of pH environments avoids loss of secondary precipitation, which are formed at pH environment above four.The effect of temperature on the interaction of the composition of the solvent with the bottomhole zone of the formation was carried out by heating the compounds with the following range of compositions at t within 80-100oC. it Was noted that this heat accelerates the reaction of interaction of the composition with the reservoir rock, the dissolution of clay, ASPO. After incubation the zone of influence in the solution abrasrussia in the dissociation of the acid, the resulting hydrolysis bisulfate, completely destroy the structure of the clay.Urea, belonging to the class of amides, when heated above 80oWith acid solution (hydrolysis) is cleaved with the formation of carbonic acid and ammonia.< / BR>When heated for a long time the decomposition of urea (or urea) with ammonia (or ammonium ion in water NH4+), carbon dioxide CO2and water.The solubility of a core in the composition of the solvent was determined by treating the sample of core material within 24 hours at different temperatures. Took sample disintegrated core different fields, brought into contact with the test composition and thermostatically in a sealed container for 24 hours at a given temperature. After processing the sample cores were dried determined drop weight percent. It was found that the reaction of formation of ammonium ions NH4+comes with different speed, depending on the temperature of 80-120oC. the Start of the reaction was established, using trapping gases with its subsequent measurement.It was noted that when the contacting core >With 4 hours
when 90oWith - in 3 hours
when 100oC - 2.5 hours
if 110oWith - in 2 hours
if 120oWith - 1.5 hours
To establish the end of the reaction duplicate sample sample cores were separated from the composition, dried, and identified the drop in sample mass. It was found experimentally that the end time of reaction ranges from 24 to 18 hours depending on the temperature of the heating zone of impact structures.The research results are placed in table. 3.Introduction to the structure of the solvent additive surfactant reduces the interfacial tension between the oil - rock - water. As amonneho surfactant use sulfinol. The inclusion of sultanol in the composition gives good effect. Processing of PPP compositions comprising sultanol allows it to retain its surface-active properties for a long time due to the nature of the surfactant. Due to their nature sultanol heat resistant; it retains its properties in the temperature range of 80-120oSince, unlike the og nonionic surfactants, which destructuring at temperatures above 78oC. Sulfinol is a surfactant with an active ion of sulfopropyl and capable of plastic is composed of ammonium ions have alkaline properties and are also as a "sacrificial" agent, warning premature response sultanol with hardness salts containing ions of CA2+. To test the stability of the compositions were prepared with the compositions in water of different salinity. The results of these tests are placed in the table. 4. As can be seen from table thus prepared compositions on the model of mineralized water resistant, stable, and structures on fresh water, do not give a cloudy precipitation, which usually sultanol gives in hard waters.An example of the method.Handle bottom hole zone of the oil wells are equipped with deep-well pump. Well stop without damping. Raise from the well downhole pumping equipment and lowered into the borehole to the productive formation of the tubing with the packer. Set the packer in the annular space above the perforations. Pumped into the well, the proposed composition of the solvent of deposits in the amount of 1 m3within 1 m of the effective capacity of the reservoir. Push the solvent into the reservoir so many and squeezing the liquid, so that at the end of produce in tubing 1 m3the proposed solvent. Run into the tubing on the cable in Parsabad ease of maintenance and low energy consumption. Warm up the bottomhole formation zone for 6-8 hours at a temperature of 120oSince then remove the heater, remove the packer and up the tubing. Spend swabbing wells and run it.As a result of application of the method in the well 2248 Bush 442 Nivagalskoe fields in Western Siberia has managed to significantly increase the productivity of the well.Sources
1. RF patent 2146003, CL E 21 In 43/25, published. 27.02.2000,2. RF patent 2160359, CL E 21 In 43/25, published. 10.12.2000, The method of complex impact on the bottom-hole zone of the well, including extraction from deep wells and pumping equipment, run in hole to bottom hole tubing, filling wells solvent oil deposits, the displacement of the solvent and squeezing the liquid in the bottomhole formation zone, the descent of the heater, the heating of the solvent in the perforation interval, removing the heater and run well into operation, characterized in that the solvent of oil deposits using an aqueous solution of 10% concentration of sodium bisulfate, 10% concentration of urea sodium and 0.5%-Noah the end of the Le it produce in the bottomhole formation zone, in this case, before the displacement of solvent seal annulus.
FIELD: oil and gas production.
SUBSTANCE: invention is intended to protect inner surface of transmission pipelines against asphalt-tar-paraffin deposits and provides appropriate composition containing 0.5-10% polyvinyl alcohol, 0.01-1% nonionic surfactant (FK 2000 PLUS), and water.
EFFECT: prolonged pipeline protection effect of composition and manifested demulsification activity.
1 dwg, 5 tbl, 5 ex