Method of bottom-hole zone treatment of low-permeable terrigenous formations (versions)

FIELD: oil and gas production.

SUBSTANCE: method of bottom-hole zone treatment of low-permeable terrigenous formation according to the first version consists in flushing of killed well, sequential pumping of methanol, 18-20% solution of hydrochloric acid for acid bath installation, then the well is repeatedly pumped by 18-20% solution of hydrochloric acid and buffer-gas condensate, acid composition is squeezed into bottom-hole zone of formation by inert gas, then mud acid solution is pumped, gas influx from formation is caused and then reaction products are removed together with gas flow, the well is treated through flare line with removal of reaction products till it reaches design conditions and then the well is placed under production. Method of bottom-hole zone treatment of low-permeable terrigenous formation according to the second version consists in sequential pumping of methanol, 18-20% solution of hydrochloric acid and buffer-gas condensate into non-killed well through tubing casing, acid composition is squeezed into bottom-hole zone of formation by inert gas, then mud acid solution is pumped, gas influx from formation is caused and then reaction products are removed together with gas flow, the well is treated through flare line with removal of reaction products till it reaches design conditions and then the well is placed under production.

EFFECT: recovery of gas-hydro-dynamic connection of well with low-permeable and highly colmataged terrigenous productive formation in condition of abnormally low formation pressure.

2 cl

 

The invention relates to the oil and gas industry, namely, the treatment of bottom-hole formation zone, in particular the tight terrigenous sediments.

The reservoir gas condensate wells in West Siberia belong to the low permeability of terrigenous sediments cemented clayey cement content up to 10%. From experience of using acid treatment it is known that in the reservoir with the percentage of carbonate sediments above 20% of the most effective means of hydrochloric acid treatment, and at a lower percentage and removal of calcium compounds required complex processing: means of hydrochloric acid treatment in combination with mud acid treatment.

Staged injection of acid composition in the reservoir associated with the presence in the cement composition of rocks, minerals contain calcium, which when reacted with hydrofluoric acid forms insoluble precipitates, reducing the permeability of the productive formation. Removal of calcium from the reservoir is first made by means of hydrochloric acid treatment, and then mud acid treatment.

In wells that have emerged from the drilling or major repairs, the perforations in the production string strongly kolmat filtrates drilling and production fluids used in the repair is E. For decolletee the perforated interval necessary to install an acid bath, it is best suited for this means of hydrochloric acid bath. During the installation process means of hydrochloric acid baths in the interval perforations breaks the crust of the leachate drilling and processing solutions, dissolved collateralise particles that subsequently when washing the wells are removed on the day surface.

At fields in Western Siberia at the final stages of development, with abnormally low formation pressure and a great deal of watering gas collector (productive formation), it is necessary before carrying out acid treatment to spend draining the reservoir. For this purpose the most suitable reactant is methanol or a methanol water in a ratio of 40:60. Preliminary injection of methanol leads to the reduction of the interphase tension borehole fluid, the release of a significant part of "bound" water in small pores of the reservoir, the drainage bottom zone, and therefore, to improve the permeability of the reservoir and increase the effectiveness of further acid treatment.

Due to the fact that the reservoir rocks condensate fields have mixed wettability (hydrophilic and hydrophobic), breed-call the Torah oil fields are more hydrophobic the reaction rate of acid solutions with rocks gas condensate deposits are quite high, and this reduces the depth of penetration of the acid into the reservoir. This effect manifests itself when installing acid baths for cleaning perforations of the production string, which do not require deep penetration of the acid into the reservoir and distinguishes them from the acid treatment. In this case, you must use either the reagents, slowing down the reaction of the acid with a reservoir, or to re-mud acid treatment of the reservoir, which is more effective destruction of clogging compounds, including clay minerals, feldspar, quartz. In order to increase the efficiency of the mud acid treatment and increasing the depth of the bottomhole zone treatment should first be removed from the bottom zone of the products of reaction of hydrochloric acid.

During acid treatment of bottom-hole zone of hydrochloric acid breaks down the cement rocks and expand the filtration channels serving for the flow of gas and gas condensate to the bottom of the borehole, the reaction products are removed from the bottom zone when washing the wells on the surface.

To increase the efficiency of the processing means of hydrochloric acid the acid is left for reagir the cation in the reservoir for 10-12 hours (depending on the rock properties of the reservoir, its composition, temperature, etc).

When conducting a mud acid treatment responsiveness glyoxylate with rocks of the productive formation even higher, the reaction time is it in the reservoir is 2-4 hours (depending on lithologic-mineralogical composition, properties of reservoir fluids, reservoir pressure and temperature).

Hydrochloric acid and glyoxylate do not have a strong corrosive action on the lifting column or flexible pipe, used for acid treatment of bottom-hole zone and the production casing, as the acid in the factory pre-entered corrosion inhibitor.

Known methods of bottomhole zone treatment low terrigenous formation comprising pumping a variety of acidic compounds in the bottomhole formation zone [the Patents of the Russian Federation№2242604, №2247833, №2278967].

The disadvantage of all these methods is the low efficiency of processing bottom-hole formation zone, especially when much kolmat the bottomhole formation zone.

A method of processing bottom-hole zone of low permeability terrigenous reservoir, comprising the sequential injection of two acidic compounds in the bottomhole formation zone [RF Patent №2269648].

The disadvantage of this method is low efficiency of processing bottom-hole formation zone, ESP the NGOs with much kolmat the bottomhole formation zone and abnormally low formation pressure.

A method of processing bottom-hole zone of low permeability terrigenous reservoir, comprising the sequential injection of two acidic compounds in the bottomhole formation zone [RF Patent №2198290].

The disadvantage of this method is low efficiency of processing bottom-hole formation zone, especially when much kolmat the bottomhole formation zone and abnormally low formation pressure.

The challenge when creating the invention is to improve the efficiency of the bottomhole zone treatment (SCR) low terrigenous reservoir.

Achievable technical result, which is obtained by the invention, consists in the recovery of gas dynamic link well with low permeability and much kolmat terrigenous reservoir under conditions of abnormally low reservoir pressure (anpd).

The task and the technical result according to the first embodiment are achieved by the fact that the treatment of bottom-hole zone of low permeability terrigenous reservoir plugged the well washed sequentially injected into it the methanol in the volume of 1-2 m31 m of the processed interval and 18-20%solution of hydrochloric acid in the amount of 2-3 m31 m of the processed interval to install an acid bath, leaving the acid solution for the period of his re who work with clogging by particles in the perforation interval within 2-4 hours, cause gas to flow from the reservoir and along with remove the waste gas reaction on the torch, then into the well re-upload 18-20%solution of hydrochloric acid in the amount of 1.5-2.0 m31 m of the processed interval and the buffer, which is used as gas condensate, push acid composition in the bottomhole formation zone with an inert gas through the buffer to a depth of kolmat zone, but not more than 1.5 m in radius, leave the acid solution for a period of his reaction to clogging by particles in the critical zone for 10-12 hours, causing gas to flow from the reservoir and is removed along with the gas flow, the reaction products, after working well in her pumped solution glyoxylate, consisting of 3-5%hydrofluoric and 10-12%hydrochloric acid in a volume of 1.5-2.0 m31 m of the processed interval, push acid composition in the bottomhole formation zone with an inert gas through the buffer to a depth of kolmat zone, but not more than 1.5 m in radius, leave the acid solution for a period of its reaction with clogging particles for 2-4 hours, causing gas to flow from the reservoir and is removed along with the gas flow, the reaction products, after that well work through flare line with the waste reaction to taking it to design mode and enter the well into operation.

The second option is the task and those of the technical result is achieved by the fact that in unkilled hole through which the well tubing sequentially inject methanol in a volume of 1-2 m31 m of the processed interval, 18-20%solution of hydrochloric acid in the amount of 1.5-2.0 m31 m of the processed interval and the buffer, which is used as gas condensate, push acid composition in the bottomhole formation zone with an inert gas through the buffer to a depth of kolmat zone, but not more than 1.5 m in radius, leave the acid solution for a period of his reaction to clogging by particles in the critical zone for 10-12 hours, causing gas to flow from the reservoir and is removed along with the gas flow, the reaction products, after testing well pump solution glyoxylate, consisting of 3-5%hydrofluoric and 10-12%hydrochloric acid in the amount of 1.5-2.0 m31 m of the processed interval, push acid composition in the bottomhole formation zone with an inert gas through the buffer to a depth of kolmat zone, but not more than 1.5 m in radius, leave the acid solution for a period of its reaction with clogging particles for 2-4 hours, causing gas to flow from the reservoir and is removed along with the gas flow, the reaction products, after receiving a steady supply of well work through flare line with the waste reaction to its withdrawal in design mode and in the W ill result the well into operation.

The method is implemented as follows.

In the first embodiment in the stilling well, coming out drilling or major repairs, the lower tubing (tubing) or a flexible tube (GT) coiled tubing installation, washed well, then the well consistently pumped methanol in a volume of 1-2 m31 m of the processed interval for drying the bottom zone and 18-20%solution of hydrochloric acid in the amount of 2-3 m31 m of the processed interval for the installation of acid baths to decollimate of the perforation interval, leave the acid solution for a period of his reaction to clogging by particles in the perforation interval within 2-4 hours, causing gas to flow from the reservoir and along with remove the waste gas reaction on the torch, then into the well re-upload 18-20%solution of hydrochloric acid in the amount of 1.5-2.0 m31 m of the processed interval and the buffer, which is used as gas condensate, push acid composition in the bottomhole formation zone with an inert gas through the buffer to a depth of kolmat bottom-hole formation zone, but not more than 1.5 m in radius, leave the acid solution for a period of his reaction to clogging by particles in the bottomhole formation zone for 10-12 hours, causing gas to flow from the reservoir and is removed along with the flow of the gas products of the reaction, n is the following testing wells injected into it a solution of glyoxylate, consisting of 3-5%hydrofluoric and 10-12%hydrochloric acid in the amount of 1.5-2.0 m31 m of the processed interval, push acid composition in the bottomhole formation zone with an inert gas through the buffer to a depth of kolmat zone, but not more than 1.5-2.0 m radius, leave the acid solution for a period of its reaction with clogging particles for 2-4 hours, causing gas to flow from the reservoir and is removed along with the gas flow, the reaction products, after receiving a steady supply of well work through flare line with the waste reaction to its withdrawal in design mode, extracted from borehole GT (if available), after which the well is put into operation.

The second option in unkilled well, operating under pressure through the tubing string located in a borehole or a specially lowered GT sequentially inject methanol in a volume of 1-2 m31 m of the processed interval, 18-20%solution of hydrochloric acid in the amount of 1.5-2.0 m31 m of the processed interval and the buffer, which is used as gas condensate, push acid composition in the bottomhole formation zone with an inert gas through the buffer to a depth of kolmat zone, but not more than 1.5 m in radius, leave the acid solution for a period of his reaction to clogging by particles in prisao the Noi area for 10-12 hours, cause gas to flow from the reservoir and is removed along with the gas flow, the reaction products, after testing well pump solution glyoxylate, consisting of 3-5%hydrofluoric and 10-12%hydrochloric acid in the amount of 1.5-2.0 m31 m of the processed interval, push acid composition in the bottomhole formation zone with an inert gas through the buffer to a depth of kolmat zone, but not more than 1.5-2.0 m radius, leave the acid solution for a period of its reaction with clogging particles for 2-4 hours, causing gas to flow from the reservoir and is removed along with the gas flow, the reaction products, after receiving a steady supply of well work through flare line with the waste reaction to its withdrawal in design mode, extracted from borehole GT (if any), then enter the well into operation.

Under conditions of abnormally low processing bottom-hole zone and call of the flow it is advisable to use a flexible pipe, the lander into the internal cavity of the tubing that makes the call flow and reduces the length of the operation.

1. The method of processing bottom-hole zone of low permeability terrigenous reservoir, which muted the well washed sequentially injected into it the methanol in the volume of 1-2 m31 m of the processed interval and 18-20%solution of hydrochloric acid in the amount of 2-3 m3n is 1 m of the processed interval to install an acid bath, leave the acid solution for a period of his reaction to clogging by particles in the perforation interval within 2-4 h, causing the gas to flow from the reservoir and along with remove the waste gas reaction on the torch, then into the well re-upload 18-20%solution of hydrochloric acid in the amount of 1.5-2.0 m31 m of the processed interval and the buffer, which is used as gas condensate, push acid composition in the bottomhole formation zone with an inert gas through the buffer to a depth of kolmat zone, but not more than 1.5 m in radius, leave the acid solution for a period of his reaction to clogging by particles in the critical zone, 10-12 h, causing the gas to flow from the reservoir and is removed along with the gas flow, the reaction products, after working well in her pumped solution glyoxylate, consisting of 3-5%hydrofluoric and 10-12%hydrochloric acid, in the amount of 1.5-2.0 m31 m of the processed interval, push acid composition in the bottomhole formation zone with an inert gas through the buffer to a depth of kolmat zone, but not more than 1.5 m in radius, leave the acid solution for a period of its reaction with clogging particles for 2-4 h, causing the gas to flow from the reservoir and is removed along with the gas flow, the reaction products, after that well work through flare line with the waste of the reaction is about taking it to design mode and enter the well into operation.

2. The method of processing bottom-hole zone of low permeability terrigenous reservoir, which in unkilled hole through which the well tubing sequentially inject methanol in a volume of 1-2 m31 m of the processed interval, 18-20%solution of hydrochloric acid in the amount of 1.5-2.0 m31 m of the processed interval and the buffer, which is used as gas condensate, push acid composition in the bottomhole formation zone with an inert gas through the buffer to a depth of kolmat zone, but not more than 1.5 m in radius, leave the acid solution for a period of his reaction to clogging by particles in the critical zone, 10-12 h, causing the gas to flow from the reservoir and is removed along with the gas flow, the reaction products, after testing well pump solution glyoxylate, consisting of 3-5%hydrofluoric and 10-12%hydrochloric acid, in the amount of 1,5-2,0 m31 m of the processed interval, push acid composition in the bottomhole formation zone with an inert gas through the buffer to a depth of kolmat zone, but not more than 1.5 m in radius, leave the acid solution for a period of its reaction with clogging particles for 2-4 h, causing the gas to flow from the reservoir and is removed along with the gas flow, the reaction products, after receiving a steady supply of well work out which via the flare line with the waste reaction to taking it to design mode and enter the well into operation.



 

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FIELD: oil and gas production.

SUBSTANCE: invention provides a method of developing oil pool allowing production of oil from water-rich oil reservoir under difficult geological-tectonic conditions in the last development stage. In the method, neutral salt of carbonic acid and acid solution are forced into formation through injecting well with water generated in gas-liquid fringe created in formation. After pumping of neutral salt of carbonic acid, acid solution is pumped by portions alternating with water pumping. Before pumping of acid solution portions beginning by at least second portion, selective insulation of high-permeable formation intervals is performed. Aforesaid neutral salt of carbonic acid utilized is sodium carbonate aqueous solution or aqueous suspension of calcium carbonate and aforesaid acid solution is aqueous hydrochloric acid solution. Selective insulation of high-permeable formation intervals involves use of freshly prepared controllable viscoelastic composition containing water-soluble acrylic polymer, cross-linking agent, thermal stabilizer, surfactant, and water. Summary concentration of acid solution is determined from concentration of neutral salt of carbonic acid on the base of stoichiometric proportions.

EFFECT: increased efficiency of maintaining formation pressure and thereby oil recovery of formation due to leveled displacement front and reduced probability of the rupture of formation rock backbone, and simplified control of phase state of gas-liquid fringe by changing pressure of pumped acid solution portions.

8 cl

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