RU2464409C1 - Method of feeding reagent into well tubing - Google Patents

Method of feeding reagent into well tubing Download PDF

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Publication number
RU2464409C1
RU2464409C1 RU2011113610/03A RU2011113610A RU2464409C1 RU 2464409 C1 RU2464409 C1 RU 2464409C1 RU 2011113610/03 A RU2011113610/03 A RU 2011113610/03A RU 2011113610 A RU2011113610 A RU 2011113610A RU 2464409 C1 RU2464409 C1 RU 2464409C1
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RU
Russia
Prior art keywords
annulus
tubing
pump
check valve
reagent
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RU2011113610/03A
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Russian (ru)
Inventor
Ильдар Зафирович Денисламов (RU)
Ильдар Зафирович Денисламов
Артур Маратович Галимов (RU)
Артур Маратович Галимов
Шамиль Анатольевич Гафаров (RU)
Шамиль Анатольевич Гафаров
Айдар Рафикович Нагимуллин (RU)
Айдар Рафикович Нагимуллин
Руслан Марсельевич Еникеев (RU)
Руслан Марсельевич Еникеев
Original Assignee
Ильдар Зафирович Денисламов
Артур Маратович Галимов
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Application filed by Ильдар Зафирович Денисламов, Артур Маратович Галимов filed Critical Ильдар Зафирович Денисламов
Priority to RU2011113610/03A priority Critical patent/RU2464409C1/en
Application granted granted Critical
Publication of RU2464409C1 publication Critical patent/RU2464409C1/en

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Abstract

FIELD: oil and gas production.
SUBSTANCE: proposed method consists in using tubing incorporating borehole pump and packer. Note here that borehole pump is equipped with check valve. Check valve is arranged close to and above the pump on tubing outer side to allow one-way fluid flow from tubing into tube space. Said tube space is filled with process fluid with corrosion inhibitor in required concentration. Pressure in tube space is maintained not exceeding tolerable magnitude by means of electric-contact pressure gage connected to borehole pump control unit. Reagent if injected into tubing from wellhead with tube space gate valve.
EFFECT: efficient injection, safe production of oil or gas.
1 dwg

Description

The invention relates to technologies for downhole cleaning of underground equipment of producing wells from deposits by injection of solvents and can be used in the oil and gas industry.

A known method of solvent delivery to the reception of a deep pump using an armored capillary hose according to the patent of the Russian Federation No. 2260677 (publ. September 20, 2005). The disadvantage of this technology is the impossibility of filling the deep pump and elevator pipes with a clean solvent without diluting it with well fluid, while in order to obtain the maximum dissolving effect from the solvent, it must be delivered to the sediment zone without dilution, i.e. in pure form.

Known coiled tubing technologies / Mini coiled tubing as it is / Sergey Kablash, CJSC Fidmash // Time for coiled tubing. - 2009. - No. 29. - p.28-30 /, based on the descent into the column of elevator pipes of a long flexible tube of small diameter with a nozzle and flushing of the column from deposits by feeding the solvent through the tube. The technology is not applicable in elevator pipes with a column of rods inside as a drive to a deep plunger pump.

Known invention of the Russian Federation No. 2194152 "Downhole installation for regulating and cutting off the flow of the medium" (publ. 10.12.2002), which describes many installation technologies that solve problematic issues of downhole production. In particular, the column of elevator pipes above the packer and pump is equipped with a borehole chamber for transferring fluid from the elevator pipes to the annulus (key 29 in FIG. 9 of the patent description). It is obvious that the operation of a productive oil reservoir located below the packer, according to the proposed scheme (Fig.9) is impossible for the following reasons:

- formation fluid after pump 40 will flow freely through chamber 29 into the annulus;

- according to the invention, the pump 40 is not equipped with a check valve, therefore, the technological reagent pumped from the wellhead into the lift pipe string does not stay in the string, but flows under the influence of gravity down through the pump 40 or into the annulus through the chamber 29.

The reservoir fluid entering the annulus through the chamber 29 will go to the upper layer, and if it is absent, to the earth’s surface along the annulus. The latter is undesirable from an environmental point of view, since the aggressive components of the produced oil and water (high mineralization, the presence of hydrogen sulfide and mechanical impurities) will eventually lead to a breakdown in the tightness of the casing string, followed by contamination of the upstream layers of the freshwater complex.

The aim of the invention is the creation of such a technology for the operation of the indicated downhole equipment, which will allow for the safe production of formation fluid and gas and, if necessary, without tripping, to fill the column of lifting pipes (tubing) with a reagent, in particular a solvent of asphalt-resin-paraffin deposits (ASPO).

This goal is achieved by the fact that in the well-known technical solution (RF patent No. 2194152), based on the use of a string of elevator pipes (tubing) with a deep pump, a packer and a special chamber with a valve, the deep pump is equipped with a check valve, above the pump on the outside of the tubing non-return valve, providing one-way fluid passage from the tubing to the annulus, the annulus itself is filled with technical fluid with a corrosion inhibitor of the required concentration, the pressure in the annulus is sub Hold no higher than the permissible value with the help of an electric contact pressure gauge at the wellhead, connected to the control panel of the downhole pump, and filling the tubing string with reagent is carried out from the wellhead with the annulus open.

The main and additional equipment necessary for the implementation of the invention are presented in figure 1, where 1 is a column of elevator pipes (tubing), 2 is a deep pump, 3 is a check valve above the pump, 4 is a check valve into the annulus, 5 is a packer, 6 - annular space between the string of elevator pipes and the casing (production) well string, 7 - valve of the annular space, 8 - electric contact pressure gauge associated with the electric drive of the pump 2.

The technical changes made according to the invention allow the operation of underground equipment in 2 modes.

1. Operation of the reservoir: the wellhead valve of the annulus 7 is closed and the product produced by the pump 2 is raised only along the tubing string 1, since the check valve 4 into the annulus will be hydraulically closed - the pressure in the annulus 6 will always be higher than in the column of elevator pipes . Prior to the start-up of the downhole pump, this will, in particular, be facilitated by the increased density of the process fluid in the annulus.

2. Reagent (solvent) delivery to the lift pipe string: the valve 7 is opened, the reagent is pumped into the tubing string from the wellhead, while the check valve 3 closes the bottom of the tubing string, and the check valve (OK) 4 opens under the influence of pressure and forces. The required volume of reagent is pumped into the elevator pipes, approximately the same volume (or slightly less due to associated petroleum gas in the elevator pipes) of the liquid flows from the valve 7 into an open container. The valve 7 is closed and the well is left alone for the time necessary for the reaction of the reagent with deposits in the elevator pipes.

Subsequently, the pump 2 is put into operation, the dissolved deposits along with the production of the well are carried through elevator pipes to the surface of the earth.

We note the important role of technical fluid in the annulus 6. The first function is the inhibitor protection of the tubing string and production (casing) string from corrosion processes. The second function is the reliable closing of OK 4 with the simplest design due to the increased density of the process fluid. This is important on days when the well is idle, when formation fluid with gas flows through the idle pump 2 into the tubing string 1. Since at the time the well stops, the hydrostatic pressure in the annulus 6 will be higher than the same pressure in the string 1, the check valve 4 will be securely closed.

The most common form of technical fluid in oil and gas companies is highly mineralized water with increased density (1180-1200 kg / m 3 ), containing an effective corrosion inhibitor with a dosage of 30-50 g / m 3 . The gas-liquid production of a well in a string of elevator pipes usually has a density of not more than 1000 kg / m 3 , so even a slight pressure drop is sufficient for the effective operation of the check valve 4 during the shutdown of the well.

The electrical contact pressure gauge 8 is connected to the control panel for the operation of the pump 2, namely: it turns off the power to the pump when the pressure in the annulus 6 rises above the permissible value. Such an emergency can occur when the pump is running and the elevator pipes or onshore pipelines are suddenly or gradually blocked from the well by deposits of various kinds: paraffin deposits, mechanical impurities or foreign objects.

The inventive method is implemented by the following simple steps.

1. From the control panel stop the operation of the submersible pump 2.

2. The valve 7 is connected to the mobile capacity of a tank truck or CA-320.

3. The valve 7 is opened, and the required volume of reagent (solvent) is pumped into the column of elevator pipes from the wellhead.

4. The valve 7 is closed and the well is left alone for the time required to dissolve the deposits in the tubing.

5. The valve 7 is re-opened, an additional volume of process fluid is added to the annulus.

6. The valve 7 is closed, and the submersible pump 2 is put into operation in normal mode.

The method proposed for examination is especially relevant for wells equipped with a sucker rod pump (SHG) for 2 reasons:

- the role of the check valve 3 is performed by standard valves of the plunger pump;

- the elevator pipes of such wells are usually covered by paraffin due to their low productivity with subsequent increase in the load on the rod string.

In our opinion, the proposed technical solution meets the criteria of “significant difference” and “novelty”, since it was proposed for the first time to operate a well with constant one-way hydrodynamic connection between the tubing string and the annulus, and the annulus itself is reliably protected by a corrosion inhibitor in the composition of heavy technical fluid. To use the already constantly existing hydrodynamic connection (check valve 4 in Fig. 1), when organizing the injection of the reagent (solvent) into the lift pipes, it is enough to open the end of the communicating vessels, i.e. gate valve 7 annulus.

The goal of the invention is fulfilled, and the economic effect is the successful targeted delivery of the reagent to the elevator pipes. And this leads first of all to saving an expensive reagent. A passing, but not unimportant effect is the preservation of the tubing string and production (casing) string from corrosion processes. There is also a third - scientific effect. By the difference in the volumes of the injected reagent and the released technological fluid mixed with carbonated oil from the gate valve 7, it is possible to estimate the gas content in the oil of elevator pipes and other issues of the state of various fluids under pressure.

Claims (1)

  1. A method of delivering a reagent to a string of elevator pipes of a well, which consists in using a string of elevator pipes with a downhole pump and a packer, characterized in that the deep pump is equipped with a check valve, and a check valve is provided on the outside of the lift pipe at the closest distance to it from the side of the lift pipe providing one-way fluid from the elevator pipe into the annulus, the annulus itself is filled with a technical fluid with a corrosion inhibitor of the required concentration, the pressure in the annulus a nd is maintained not higher than the allowable value via electric contact manometer associated with the operation of downhole pump control and reagent injection into the column tubings leading from the wellhead at the open gate valve annulus.
RU2011113610/03A 2011-04-07 2011-04-07 Method of feeding reagent into well tubing RU2464409C1 (en)

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RU2011113610/03A RU2464409C1 (en) 2011-04-07 2011-04-07 Method of feeding reagent into well tubing

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RU2464409C1 true RU2464409C1 (en) 2012-10-20

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104405301A (en) * 2014-09-23 2015-03-11 中国石油天然气股份有限公司 Freezing and blocking-prevention production pipe column for natural gas well
RU2651728C1 (en) * 2017-02-21 2018-04-23 Ильдар Зафирович Денисламов Method of removing aspo from well equipment
RU2667950C1 (en) * 2017-07-10 2018-09-25 Алия Ильдаровна Денисламова Method for processing the oil-extracting well with reagent
RU2682827C1 (en) * 2018-05-07 2019-03-21 Федеральное государственное бюджетное образовательное учреждение высшего образования "Уфимский государственный нефтяной технический университет" Method for removal of asphalt-resin-paraffin deposits from a petroleum wells
RU2695724C1 (en) * 2018-12-24 2019-07-25 Ильдар Зафирович Денисламов Method of asphalt-resin-paraffin deposits from an oil well

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU604970A1 (en) * 1974-08-15 1978-04-30 Всесоюзный научно-исследовательский институт природных газов Well inhibition device
US4589482A (en) * 1984-06-04 1986-05-20 Otis Engineering Corporation Well production system
RU2049227C1 (en) * 1992-05-05 1995-11-27 Акционерное общество "Российская торговая компания" Method for well treatment
RU2135830C1 (en) * 1998-02-09 1999-08-27 Открытое акционерное общество "Роснефть-Пурнефтегаз" Method of deep-well pumping oil recovery and deep-well pumping unit used for realization of this method
RU2194152C2 (en) * 2001-01-24 2002-12-10 Махир Зафар оглы Шарифов Downhole plant for regulation and shutoff of medium flow
RU2211311C2 (en) * 2001-01-15 2003-08-27 ООО Научно-исследовательский институт "СибГеоТех" Method of simultaneous-separate development of several productive formations and well unit for method embodiment
US20060096760A1 (en) * 2004-11-09 2006-05-11 Schlumberger Technology Corporation Enhancing A Flow Through A Well Pump
RU2287672C1 (en) * 2005-06-01 2006-11-20 Открытое акционерное общество "Татнефть" им. В.Д. Шашина Plant for forcing liquid from water bed of well into oil bed

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU604970A1 (en) * 1974-08-15 1978-04-30 Всесоюзный научно-исследовательский институт природных газов Well inhibition device
US4589482A (en) * 1984-06-04 1986-05-20 Otis Engineering Corporation Well production system
RU2049227C1 (en) * 1992-05-05 1995-11-27 Акционерное общество "Российская торговая компания" Method for well treatment
RU2135830C1 (en) * 1998-02-09 1999-08-27 Открытое акционерное общество "Роснефть-Пурнефтегаз" Method of deep-well pumping oil recovery and deep-well pumping unit used for realization of this method
RU2211311C2 (en) * 2001-01-15 2003-08-27 ООО Научно-исследовательский институт "СибГеоТех" Method of simultaneous-separate development of several productive formations and well unit for method embodiment
RU2194152C2 (en) * 2001-01-24 2002-12-10 Махир Зафар оглы Шарифов Downhole plant for regulation and shutoff of medium flow
US20060096760A1 (en) * 2004-11-09 2006-05-11 Schlumberger Technology Corporation Enhancing A Flow Through A Well Pump
RU2287672C1 (en) * 2005-06-01 2006-11-20 Открытое акционерное общество "Татнефть" им. В.Д. Шашина Plant for forcing liquid from water bed of well into oil bed

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104405301A (en) * 2014-09-23 2015-03-11 中国石油天然气股份有限公司 Freezing and blocking-prevention production pipe column for natural gas well
RU2651728C1 (en) * 2017-02-21 2018-04-23 Ильдар Зафирович Денисламов Method of removing aspo from well equipment
RU2667950C1 (en) * 2017-07-10 2018-09-25 Алия Ильдаровна Денисламова Method for processing the oil-extracting well with reagent
RU2682827C1 (en) * 2018-05-07 2019-03-21 Федеральное государственное бюджетное образовательное учреждение высшего образования "Уфимский государственный нефтяной технический университет" Method for removal of asphalt-resin-paraffin deposits from a petroleum wells
RU2695724C1 (en) * 2018-12-24 2019-07-25 Ильдар Зафирович Денисламов Method of asphalt-resin-paraffin deposits from an oil well

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Effective date: 20130408