Procedure for treatment of bottomhole zone of producer with two wellheads. RU patent 2490443.

IPC classes for russian patent Procedure for treatment of bottomhole zone of producer with two wellheads. RU patent 2490443. (RU 2490443):

E21B43/27 - by use of eroding chemicals, e.g. acids

E21B37/06 - using chemical means for preventing or limiting the deposition of paraffins or like substances (chemical compositions therefor C09K0008520000)

Another patents in same IPC classes:

Method for well completion / 2490442
In method for well completion including pumping of acid solution into open horizontal hole in the mode of jet impact such impact is attained due to a jet delivery by a jet nozzle at the end of a flexible flush-joint pipe. The nozzle is placed at the borehole bottom. The acid solution is pumped with circulation through the well mouth; while acid solution is circulating the flexible flush-joint pipe is lifted simultaneously from the well with the speed not exceeding speed of the borehole filling by the acid solution. When horizontal hole is filled with the acid solution, the solution is overflushed into the stratum with staged pressure build-up and exposure at each stage. The flexible flush-joint pipe with a nozzle is placed again at the borehole bottom and the operation of borehole filling and overflushing is repeated again. Soaking takes place so that acid solution could react with the rock. The flexible flush-joint pipe is lifted to the interval of inert gas pumping, an inert gas is pumped and a build-up curve is recorded. Cyclic well killing is carried out in the mode of water pumping - soaking - oil draining till complete oil drain; thereafter a submerged pump is run-in and the well is input into operation.

Device for treatment of bottomhole formation zone of a well and method for treatment of bottomhole formation zone of well / 2487237
Device for treatment of bottomwhole formation zone contains an air chamber with atmosphere pressure and length of 20-50 m connected to the first additional perforated chamber with seal layer, solid heat generating compound A with flame igniter, combustible high-strength compound B and breakable calibrated membrane located inside; the first added perforated chamber by means of a coupling with holes is connected to the second added inlet chamber with combustible high-strength compound C, igniter and breakable calibrated membrane located inside; the second additional perforated chamber by means of a coupling with added air chamber with length of 1.5-3 m connected by means of a coupling and metal adapter with to inlet chamber that is made of elastic plastic material with seal layer, solid acid generating compound D with igniter located inside; in the metal adapter there are drilled holes; compound A generated heat and gas of the following components by wt %: ammonium nitrate 35; sodium bichromate 2; barium nitrate 15; aluminium ASD-1 1.5; iron-aluminium thermite 31; epoxide compound (mixture of ED-20 tar, EDOS plasticiser and AF-2M hardener) 15.5; compound B is made of the following components by wt %: ammonium nitrate 30-40, calcium carbonate 5-10, the above epoxide compound 50-65; inside the added inlet chamber there is a layer of glass sealant and solid gas generating compound E made of the following compounds by wt %: ammonium nitrate 70, sodium bichromate 1, the above epoxide compound 29; compound C is made of the same composition as compound B; compound D is made as thermal-gas-chemical solid fuel with a layer of glass sealant and a layer of epoxide compound on top of it; the above fuel consists of the following components by wt %: ammonium nitrate 12-16, lithium fluoride 1-3, barium nitrate 5-8, aluminium ASD-1 0.7-0.8, iron-aluminium thermite 14-16, hexachlorane 20-30, polytetrafluoroethylene 20-30, the above epoxide compound 5-10. The method for treatment of bottomhole zone (BHZ) includes delivery of the above device by a wireline, combustion of compound D and formation of maximum quantity of chemical agents, holding for the purpose of reaction of acids produced during combustion with BHZ formation, running with installation of the coupling with holes at the level of treated stratum, opening of the chamber with length of 20-50 m, actuation of breakable calibrated membrane in result of layer-by-layer combustion of compounds A and B with implosion treatment of BHZ, removal of impurities from bottomhole stratum; during holding thermal-gas-chemical impact acts on the stratum for 30 minutes ad pressure can be corrected due to availability of holes in the metal adapter at fixed position of the above fuel inside the inlet chamber due to the above layers of sealant and compound with formation of gases heated up to high temperatures at high pressure within treatment range; opening of the chamber with length of 1.5-3 m is carried out by sequential actuation of the igniter, compounds E and C and breakable calibrated membrane located in the second added inlet chamber; after hydraulic shock there's another holding of the process for 30 minutes; when the chamber with length of 20-50 m is opened combustion of compound A takes place with formation of gases heated up to high temperature at high pressure within treatment range.

Stimulation method of formation fluid influx from well / 2485305
Stimulation method of formation fluid influx from the well consists in lowering to the well of a tubing string. Counter pressure on the productive formation is decreased owing to replacing the liquid column with liquid-gas mixture (LGM) at observance of the required value of depression on the productive formation. Before the tubing string is lowered, its lower end is equipped with a remote subsurface pressure gauge and a filter. The tubing string is lowered to the well so that the filter is located opposite the formation perforation interval; after that, treatment of the bottom-hole zone of the formation is performed using a chemical method with process exposure for reaction. Then, the tubing string is lowered further so that the filter is located below the formation bottom, and into the inter-string space there lowered is a string of flexible tubes (FT) 100 m below the liquid level in the well. The liquid column is replaced in the inter-string space of the well with LGW and lowering of the FT string is continued. When lower end of the filter of the tubing string is reached, lowering of the FT string is stopped; then, stimulation of the formation fluid influx is started by gradual reduction of density of pumped LGM till the required depression on the productive formation, which is controlled as per readings of the remote subsurface pressure gauge, is achieved. After completion of stimulation of the influx from the well there removed is FT string from the inter-string space of the well, and operating equipment is lowered to the well and the well is put into operation.

Method for reagent clay cake removal from well / 2484244
Method for reagent clay cake removal from a well involves preliminary lowering of the tubing to lower perforation holes, formation in the zone of perforation holes of the first bath by pumping to the well via the tubing of a clay cake removing solution, its exposure, removal, further formation in the same zone of the second bath of water solution of acid with its being forced through the perforation zone to the formation and removal of the second bath by flushing; development of the well. As the clay cake removing solution, water solution of caustic soda with addition of surface active substance (SAS) is used. When the tubing is being lowered to the ell, it is equipped with a packer. Then, at open casing valve there performed is formation of the first bath by pumping of the above water solution of caustic soda via the tubing string, and the specified water solution of caustic soda is delivered to the formation by its being forced with process liquid via the tubing. Them the packer is set at the depth of not less than 50 metres above the treated formation, and forcing of water solution of caustic soda is performed with process liquid to the formation without exceeding allowable pressure on the formation; then, the well is kept for 10 hours for reaction under pressure not exceeding allowable pressure on the formation. Then, the packer is unpacked, and the working face is flushed by reverse flushing with process water by additional lowering of the tubing to the distance of 1-1.5 metres till the working face. Then, the packer is lifted so that it can be located at the depth of not less than 50 metres above the formation. Then, in the same zone there formed is the second bath by pumping of clay-acid solution with addition of Katapin KI-1 reagent on the basis of the fact that volume of clay-acid solution shall be 0.5-1 m3 per metre of the formation. The above clay-acid solution is forced with process fluid via the tubing to the formation; then, the packer is set and forcing of clay-acid solution is performed with process fluid to the formation without exceeding allowable pressure on the formation. Reaction exposure is performed during 1-2 hours. Then, well swabbing is performed via the tubing in the volume of 1.5-2 of the well volume. Then, the well injection capacity is determined at the pressure not exceeding maximum allowable pressure on the formation. When the required well injection capacity is not achieved, the above operations are repeated maximum for three times till the required well injection capacity is achieved.

Method for increasing oil recovery of deposit in carbonate reservoirs of fracture-pore type / 2482269
Method for increasing oil recovery of the deposit in carbonate reservoirs of fracture-pore type involves formation of a group of production wells with an injection well in the centre so that the injection well can be located in the lower part of the deposit structure in relation to production wells, oil recovery from the group of wells watered out with bottom water, forced extraction of fluid from the injection well till the response of the neighbouring wells to that action and reduction of formation pressure in the area of responding production wells. After steady reduction of formation pressure in the area of responding production wells by more than 10 %, each of them is pumped with waterproof compound that is strengthened under action of chlorhydric acid in the volume of 15-20 m3. After waterproof compound is cured, forced extraction of the fluid is stopped and acid bearing compound in the volume of 0.4-1.0 m3 per metre of oil saturated part of the formation is pumped to each well treated with waterproof compound. Responding production wells are brought into operation.

Method for bottom-hole zone treatment / 2477787
Method for formation bottom-hole area treatment includes mounting of oil-well tubing in the well below perforation holes, determination of technical condition of production string and character of production formation saturation in perforation zone on the base of geological-geophysical researches data, pumping and squeezing down to the formation water solution of alkali metal supersalt with holding for reaction for 10-12 h, extraction of reaction products from bottom-hole area by well blowing by inert gas or gas from well-donor through casing annulus, pumping and squeezing down to the formation hydrogen chloride, holding for reaction for 6-8 h, well development by gas from well-donor or inert gas.

Acidic aqueous solution containing chelating agent and use thereof / 2476475
Invention relates to an acidic aqueous solution containing a chelating agent and an acid, wherein the chelating agent is glutamic N,N-diacetic acid (GLDA) or a salt thereof and wherein the amount of GLDA or the salt thereof is 20-60 wt %, based on the weight of the aqueous solution, and wherein the acid is selected from hydrochloric acid, hydrobromic acid, hydrofluoric acid, hydroiodic acid, sulphuric acid, nitric acid, phosphoric acid, formic acid, acetic acid, citric acid, lactic acid, malic acid, tartaric acid, maleic acid, boric acid, hydrogen sulphide or a mixture of two or more of these acids, and use of said solution in cleaning processes, precipitation processes or processes of removing salt deposits, at oil fields in completion and stimulation by acid treatment, fracturing and/or deposit removal. The acidic aqueous solution has pH below 3.

Development method of bottom-hole zone of terrigenous oil formation / 2475638
According to the method of development of bottom-hole zone of terrigenous oil formation, before pumping of acid solution well is killed by solution of alkali metal hydroxide adding potassium and/or natrium chloride in quantity 0-35 wt % to obtain optimum density of composition, then well is pumped with aqueous solution containing 4-8 wt % of chlorhydric acid and 0.5-1.5 wt % of fluorhydric acid adding versene (trilon "B") in quantity 0.01-0.5 wt %, sodium dodecylsulfate in quantity 0.01-0.1 wt %, then aqueous solution of oil wetting agent NG-1 with concentration 0.01-2 wt % is pumped into formation.

Method of well bore zone treatment of production well / 2473800
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Treatment method of bottom-hole zone of horizontal or inclined well / 2471978
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Well reagent supply device / 2490427
Device consists of cylindrical containers filled with reagent and equipped with end plugs connected by couplings and dosing units communicating with mixing chambers and connected hydraulically to the well. In each container there is a shaft with ends screwed into axial threaded openings of the end plugs. A dosing unit is made in the upper part of the shaft as am axial channel and radial openings communicating with it; mixing chambers are placed inside couplings. The container can be made of a fibreglass pipe or thin-wall pipe of stainless steel.

Method for preventing deposits of non-organic salts / 2484238
In the method preventing the deposit of non-organic salts in commercial oil and gas equipment including series pumping to the bottomhole zone of formation of solution fringes, solution of inhibitor of salt deposition and hydrophilic displacement fluid; as a solvent, mutual solvent is pumped; salt deposition inhibitor is pumped in water solution of potassium chloride and as hydrophilic displacement fluid there pumped is the above water solution of potassium chloride; at that, as mutual solvent, there pumped is butyl cellosolve or mixture of solvents at the following component ratio, wt %: methanol 10, acetone 50, butyl cellosolve 35, dimethyl sulphoxide 5, salt deposition inhibitor is pumped in water solution of potassium chloride at the component ratio, wt %: salt deposition inhibitor 10, potassium chloride 1-2, fresh water is the rest; as hydrophilic displacement fluid there pumped is 1-2% of potassium chloride solution in fresh water; as salt deposition inhibitor, inhibitor of organophosphorous type is used.

Dosed chemical reagent supply device / 2482264
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Flushing method of well submersible electric-centrifugal pump by reagent / 2475628
During this method implementation reagent is supplied to pump cavity through check three-position valve installed above vent hole of pump. Delivery and accumulation of reagent is performed in tubing through flexible reinforced pipe lowered from wellhead for the period of treatment or previously installed fixed inside tubing string or along inter-tube space of well. Accumulated volume of reagent above the pump and check valve is forced in the pump through check three-position valve by generation of required pressure differential in tubing string from wellhead for check three-position valve opening in backward direction.

Device for thermo-chemical treatment of wells / 2473783
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Method of processing primarily flat horizontal well hole for removal of mud bulk from bottom-hole formation zone / 2467163
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Method of feeding reagent into well tubing / 2464409
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Method of synergetic reactant-impulse-wave treatment of bottom-hole formation zone and plant for its implementation / 2462586
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Paraffin deposit-preventing hydrophilic property imparting composition / 2244100
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.

FIELD: oil and gas industry.

SUBSTANCE: in procedure for treatment of bottomhole zone with two wellheads in case of failure of an electric-centrifugal pump (ECP) with no apparent deviation in its operating parameters and in case of alkalinity growth for extracted product up to pH>7 the required volume of hydrogen chloride solution is calculated on the basis of a length and diameter of the well filtering part; the required volume of hydrogen chloride solution is selected to treat the whole volume of the strainer; the required volume of flush fluid is calculated for delivery of compounds into a slope wellhead. ECP is shutdown at the vertical wellhead before pumping of hydrogen chloride solution is started. The required volume of hydrogen chloride solution is carried out into tubular annulus from the side of the vertical wellhead. When pumping of hydrogen chloride solution is over extraction from the slope wellhead is increased and ECP is started from the vertical wellhead. ECP is stopped at the vertical wellhead and hydrogen chloride solution is overflushed by the flush fluid into filtering part of the well. After ECP startup in enlarged extraction rate from the slope wellhead samples are taken periodically in order to check pH value, monitor dynamics in changes of fluid supply from the slope wellhead. When pH value id recovered up to the normal value ECP is started into operation from the vertical wellhead and supply from the slope wellhead is returned back to normal operation mode.

EFFECT: effective treatment of bottomhole and filtering zone of the well, cleaning of the pump operating elements from salts and simultaneous technology simplification due to exclusion of tripping operations.

1 ex, 1 dwg

The invention relates to the oil industry and may be applied at processing of bottom-hole zone the production well.

Known way to improve the between-repairs period of work equipment of the production well, complicated by scaling protection, including the injection of a composition, containing corrosion inhibitor and water (inventor's certificate of the USSR №1148977, . 07.04.1985).

The closest to the proposed the invention is essentially a technical way to increase the between-repairs period of work equipment of the production well, complicated by scaling protection, including the injection of a composition, containing corrosion inhibitor and water, periodic implementation: preliminary cleaning the specified equipment of the oil film and deposits of asphalt-resin-paraffin, injection of organic solvent in the hole, then removal of deposits of iron salts from the surface of the equipment, the download composition additionally contains hydrochloric or acetic acid and scale inhibitor in the tube space stopped well, in pump and a shutter speed of 1.5 to 2.0 hours, the composition is taken in the amount of 5.0-5.5% from volume of the fluid dynamic level before the intake pump (RF Patent №2375554, publ. 10.12.2009 - prototype).

A General disadvantage of known technical solutions is the complexity of the work, the need of tripping and attract brigade underground repair of wells.

The proposed invention solves the problem of simplifying the technology due to the exclusion of tripping and exceptions to attract brigade underground repair of wells.

The task is solved by a method of processing of bottom-hole zone well, namely that at disrupting the filing pump (ESP) without visible deviations in the parameters of the pump and increase the alkalinity of the extracted products to pH pH>7, make a calculation of the necessary volume of hydrochloric acid on the basis of the length and diameter of the column part of borehole filter, choose the amount hydrochloric acid is required to process the entire volume of the filter, calculate the necessary amount of fluid for finishing the reaction mixture to the inclined mouth before download solution of hydrochloric acid to produce a stop ESPs vertical mouth, have pumped required the volume of the solution of hydrochloric acid into the well annulus by vertical mouth, after the injection of a solution of hydrochloric acid to increase the selection from the sloping mouth and briefly run electrical submersible pumps with a vertical mouth, after stopping the electrical submersible pumps with a vertical mouth produce solution hydrochloric acid fluid in the filter part of the well, after the start of the ESP increased tempo of the selection from the sloping mouth periodically samples are selected fluid on pH, monitor the dynamics of changes in the supply of liquid from the sloping mouth, after restoring the pH to normal level start in work the electrical submersible pumps with a vertical mouth and return flow with oblique mouth to normal operation.

The essence of the invention

On some deposits oils (VSS) productive horizon complex sandstones, where as a binding substance acts of VSS, and for Sandstone aquifer part materials are calcite, minerals group clays, which are in different proportions. In the pore space of calcite grains or their accumulation are in a rather poor adhesion to the walls of the pores and among themselves. Calcite mainly fine-grained (0,01-0,1 mm) in weakly cemented differences, and fine (0.1-0.25 mm) in the areas of seals. Zones of seals in the productive formation are its bottom part and abnormal zones within the horizon.

Chemical precipitation of calcite occurs under the following scheme:

C a 2 + + 2 H C O 3 - = C a C O 3 + H 2 C O 3 ( 1 )

Education anion NSO 3 - describes a schematic equation:

C H n + O 2 = C O 2 + H 2 O + t e p l about t and

reaction (2)

where CH n - hydrocarbons,

WITH A 2 +H 2 O=NSO,

H 2 CO 3 =N + +NSOS ,

H + + C O 3 2 - = H C O 3 - ( 3 )

The Deposit is underlain by the waters of the hydrocarbonate-sodium, therefore, a source of cation of calcium are produced water. New calcite enveloping grain and forms a network of thin channels and films, penetrating breed in all directions. SVN same occupies the Central part of the pore space. The main source of CO 2 - oxidation of hydrocarbons (response 2). Ion NSO 3- formed at the decomposition of feldspars by absorption WITH 2 emerging hydroxyl ions:

2 K a A l 2 S i 2 O 8 + H 2 O + 2 C O 2 = K + + A l 2 O 3 x 2 S i O 2 + 4 S i O 2 + 2 H C O 3 - ( 4 )

Reaction 3 and 4 lead to increased alkalinity of a solution, i.e. Jonah HE is . This growth, as well as the exothermic reaction 2 favor the precipitation of calcite. Thus, we can conclude that the gradual weathering of the oil, and then SVN happened smooth increase of productive sandstones calcite. This process is most developed in the vicinity of the water-bitumen contact and to a lesser extent in the areas of heterogeneity of the productive formation. At the same time, in the middle part of the reservoir is less oxidation of bitumen and, as a result, the environment is becoming less alkaline that prevents the deposition of calcite.

Fallow VSS develop a method drainage, which implies the presence of two horizontal wells at a distance of 5 m in the vertical. The injection of steam lead at the top of the injection well, and from the lower production well selected fluid. Unleavened pairs when mixed with reservoir water contributes to deposition of salts carbonate composition within the productive horizon. Also the deposition of salts conducive to the active selection of liquid, at which does not exclude partial breakthrough bottom water to the working faces of the wells.

All this leads to the fact that at the injection of steam and extraction occurs intensive deposition of calcium carbonate as in critical part of the wells, and directly in the aperture filter wells and on the working sites of deep ESP. All this creates additional obstacles to the production of the liquid, resulting in supply failure production wells, with the subsequent failure of the deep ESP.

The existing materials and technologies for scaling protection in the well, basically, are ineffective, difficult roads. So, for treatment should involve a brigade of a workover rig, apply the appropriate equipment, perform lowering and lifting operations, work processing interval slot filter. Especially these works is more complex when you run them in well.

The proposed invention solves the problem of simplifying the technology due to the exclusion of tripping and exceptions to attract brigade underground repair of wells. The task is solved as follows.

When working wells, mining VSS, analyze operation of pumping equipment and the parameters of the output. With the disruption of filing ESP without visible deviations in the parameters of the pump and increase the alkalinity of the extracted products to pH>7 make a conclusion about the salt deposits on the equipment and in the bottom-hole area. Calculate the necessary amount of hydrochloric acid on the basis of the length and diameter of the column filter part well. Choose the amount of hydrochloric acid needed to process the entire volume of the filter. Calculate the necessary amount of fluid for finishing the reaction mixture to the inclined mouth. As a solution of hydrochloric acid used solution of 6-10%concentration, has sufficient reactivity, but not calling active corrosion of underground equipment.

Figure 1 presents producing well, Mine is vertical and the mouth of 1, the downward mouth 2, ESP vertical mouth 3, ESP inclined mouth 4, slotted filter 5. Both ESP hung on the pillars of tubing 6 and 7. Well casing 8.

Before injection solution of hydrochloric acid to produce a stop ESP 3 vertical mouth of 1. By vertical mouth 1 have pumped necessary volume of hydrochloric acid solution into the well annulus, i.e. the space between the tubing string 6 and casing 8. After the injection of a solution of hydrochloric acid to increase the selection from the sloping mouth 2 and run ESP 3 briefly for 3-5 minutes with vertical mouth of 1. After stopping ESP 3 with vertical mouth produce 1 hydrochloric acid liquid (water) in the filter part of the wells in the area of slot filter 5. After the launch of ESP-4 increased the tempo of the selection from the sloping mouth 2 periodically samples are selected fluid on pH, track the dynamics of changes in the supply of liquid from the sloping mouth 2, after restoring the pH to normal levels start in work of ESP-3 vertical-mouth 1 and return flow with oblique mouth 2 in normal mode.

Specific example of the

On well, mining VSS, there is disruption and lower the both vertical and inclined mouth. Also in the sample of the selected fluid pH amounted to 8.12. Oil flow rate decreased from 31 to 25 tonnes. On this basis it was decided to conduct processing of bottom-hole zone. Filter part of the wells with a diameter of D=168 mm and length of 415 m Based on the calculated amount of acid in the amount of 3.5 m 3 . For acid inclined to the mouth of the need to 7.5 m 3 of water. As a solution of hydrochloric acid used solution of 8%concentration.

Before injection solution of hydrochloric acid to produce a stop ESP 3 vertical mouth of 1. By vertical mouth 1 have pumped necessary volume of hydrochloric acid in the annulus of the well. After the injection of a solution of hydrochloric acid to increase the selection from the sloping mouth 2 and run ESP 3 to 4 minutes with vertical mouth of 1. After stopping ESP 3 with vertical mouth produce 1 hydrochloric acid liquid (water) in the filter part of the wells in the area of slot filter 5. After the launch of ESP-4 increased the tempo of the selection from the sloping mouth 2 periodically samples are selected fluid on pH, monitor the dynamics of changes in the supply of liquid from the sloping mouth 2. The pH indicator shows that the acid composition reached inclined mouth 45 minutes and 1 hour pH recovered to a normal level. After restoring the pH to normal levels start in work of ESP-3 vertical-mouth 1 and return flow with oblique mouth 2 in normal mode.

As a result of acid treatment according to the described technology to process of bottom-hole zone and the filter part of the well cleaned from salts working bodies of the pump, which is evident by the absence of further disrupt or reduce the feed as vertical and inclined mouth, restored the extraction of oil from 25 to 35 tons/day., that testifies to the efficient processing of bottom-hole oil well.

Application of the offered method will clear the hole and equipment from salts and restore work well without the use of tripping and brigades of underground repair of wells.

Method of treatment of the bottomhole zone well, which is that disruption in the filing an electric centrifugal pump ESP without visible deviations in the parameters of the pump and increase the alkalinity of the extracted products to pH>7, make a calculation of the necessary volume of hydrochloric acid on the basis of the length and diameter of the column filter part wells, choose the volume of solution of hydrochloric acid needed to process the entire volume of the filter, calculate the necessary amount of fluid for finishing the reaction mixture to the inclined mouth before download solution of hydrochloric acid to produce a stop ESPs vertical mouth, have pumped necessary volume of hydrochloric acid solution into the well annulus by vertical mouth, after the injection of a solution of hydrochloric acid to increase the selection from the sloping mouth and briefly run electrical submersible pumps with a vertical mouth, after stopping the electrical submersible pumps with a vertical mouth produce hydrochloric acid fluid in the filter part of the well, after the start of the ESP increased tempo of the selection from the sloping mouth periodically samples are selected fluid on pH, monitor the dynamics of changes in the supply of liquid from the sloping mouth, after recovery pH to normal levels start in work the electrical submersible pumps with a vertical mouth and return flow with oblique mouth to normal operation.