Method of dry operation of wells

FIELD: petroleum industry.

SUBSTANCE: invention relates to oil and gas production industry, namely to dry operation of wells. The substance of the invention is as follows: according to this method wells are equipped with flow and production strings and includes injection of water repellent compound under pressure into the seam. According the invention prior to mining operations a flexible pipe is lowered into the internal space of the production string under pressure by means of the coil tubing rig. The circular and annular spaces of the well are opened. The water repellent compound is injected through the flexible pipe in the amount required, overpressure being maintained in the circular and annular spaces, which exceeds the pressure of the water repellent compound injected by not less than 10%. The water repellent compound is forced through into the seam up to the depth required. Next the flexible pipe is withdrawn out of the well. The water repellent compound is injected regularly during the period of increased gas extraction out of wells without killing the same.

EFFECT: possibility of long-term dry operation of wells with maintaining initial effective thickness of the seam.

3 cl, 1 ex, 3 dwg

 

The invention relates to the oil and gas industry, namely anhydrous well operations.

Experience of operating the wells of the Far North, in particular, Yamburgskoye field, shows that as the gas from deposits and decline in reservoir pressure rise bottom of the reservoir water, the so-called gas-water contact (DDC). Due to large sampling (flow rate) of gas from wells in the fields, the rise of the bottom of the reservoir water is not evenly distributed across space, and cone-shaped. Thus the cone bottom of the reservoir water stretches to the bottom of the borehole and increasing selection (flow rate) of gas from the well, and hence increase the speed of the gas stream, cone rises along the borehole wall and overlaps the first lower and then the upper sprocket holes, up to full irrigation wells and the cessation of gas production. The accumulation in the gas stream produced water, in other words, when saturated gas produced water, there is a weighting derived from the well column of gas and associated with an increase in static pressure in the well. There is a decrease of velocity of the gas stream, the gas can no longer lift the produced water on the surface and it starts to fall out of the gas stream, scaples is sterile on the borehole bottom. With decreasing velocity of the gas stream, and hence reduce selection (flow rate) of gas is falling off the cone bottom of the reservoir water. Water in the cone is partially returned to the bulk of the plantar brine under GVK. Partially remains trapped in the pores and capillaries of the cement rings and near borehole zone, and the bulk through the perforations penetrate to the bottom hole and fills it, preventing the gas from the well until the complete cessation of production.

Currently, there are many ways to ensure waterless operation of wells for a limited period of time. This setting cement bridge to cross the overlying interval of the reservoir, and pumping into the reservoir for hydrophobic compositions with zakreplenien their cement bridge and cross the overlying interval of the productive formation. They all have one common drawback: some time later, well again watered with due to the cone-shaped lifting plantar brine and accounts for these transactions to reiterate, prostredia while upstream intervals of the formation, reducing the effective gas-bearing capacity of the reservoir up to her disappearance and abandonment. The experience of operating wells Yamburg and other fields of the Far North shows the em what is needed is a brand new solution that will allow one side to isolate the flow of formation waters, and on the other not to reduce the effective gas-bearing part of the reservoir.

There is a method to waterless operation of wells, including injection into the reservoir water-repelling composition under pressure with the creation of waterproofing screen [kleschenko I.I. and other Insulation work during the completion and operation of oil wells. - M.: Nedra, 1998. - S-200].

The disadvantage of this method is the impossibility of providing long period of anhydrous well operation, as well as the inability to isolate the flow of formation waters in the gas and gas condensate wells without killing.

There is a method to waterless operation of wells, including injection into the reservoir water-repelling composition under pressure with the creation of waterproofing screen [kleschenko I.I., Kustyshev AV, Telkov A.P. Approximate method of calculating the time anhydrous imperfect operation of the well screen at the bottom in oil reservoirs with bottom water. - NTI Petroleum engineering, 1998, No. 3].

The disadvantage of this method is the impossibility of providing long period of anhydrous well operation, as well as the inability to isolate the flow of formation waters in the gas and gas condensate wells without killing.

The task is present in the claimed invention, is to provide opportunities waterless operation of wells for a long time at different (seasonal) modes of gas sampling (small, large) from the reservoir with the original effective thickness (power) of the reservoir, when the initial perforation interval does not overlap the cement bridge, as well as for isolation of flow of formation without killing the well.

Achievable technical result, which is obtained by the invention, consists in the possibility of a long waterless operation of wells with the original effective thickness of the layer.

The task and the technical result is achieved by the fact that the way to create a waterproofing screen in the reservoir during the operation of gas and gas condensate wells, equipped and operational Elevator columns, includes injection into the reservoir water-repelling composition under pressure. At the same time, the internal cavity of the tubing string under pressure, down to the bottom using coiled tubing installation flexible pipe, open the ring and the annulus of the well, pumped through a flexible tube gidrofobiziruyuschey composition in the required amount while maintaining the annular and annular spaces back pressure exceeds the pressure of the injection water-repelling composition is not less than 10%, push gidrofobiziruyuschey composition into the formation to the desired depth. After which a flexible pipe is then removed from the wells, and the pumping water-repelling compositions performed periodically, in periods of increasing the extraction of gas from the well without killing the well. In addition, the volume of injected water-repelling compositions take depending on the thickness of the layer and the depth of installation of the waterproofing of the screen. The pressure in the annular and annular spaces create gaseous agent from neighboring wells, or gas, or nitrogen-booster installation, or from the internal combustion engine.

Figure 1 presents the scheme of realization of this method when lifting the cone plantar brine and overlap them perforations, figure 2 is the same when pumping water-repelling composition into the formation and installation of waterproofing screen figure 3 - the same after installation of the waterproofing of the screen and the elimination of the watering hole.

The method is implemented as follows.

Into the well under pressure, down through the coiled tubing installation 1 through the guide groove 2, the injector 3, the block preventer 4, x-Mas tree valves 5, Elevator column 6, is placed inside the casing 7, the flexible tube 8 to a depth of 1 m above the bottom 9. Next, open the live ring 10 and annulus 11 space well (respectively between the flexible pipe 8 and the Elevator column 6; between the Elevator column 6 and the production column 7). In a well pumping unit 12 through a flexible tube 8 download gidrofobiziruyuschey composition 13 to the extent necessary, depending on the thickness of the layer and depth (radius) install waterproofing screen 14. Push gidrofobiziruyuschey composition 13 into the reservoir under pressure required for installation of waterproofing screen 14 depth (radius). In the ring 10 and annulus 11 spaces well create a pressure of not less than 10% pressure pumping and jacking into the reservoir water-repelling composition 13. Maintaining back pressure in the ring 10 and annulus 11 spaces well by feeding gaseous agent 15, for example natural gas from nearby wells or pipeline (not shown), inert gas (nitrogen) from the nitrogen-booster installation 16, the exhaust gases from the internal combustion engine (not shown). After completion of the work a flexible tube 8 is pulled out of the well. Punching water-repelling composition 13 into reservoir exercise gaseous agent 15 in the ring 10 and annulus 11 space well, and into the internal cavity of the flexible tube 8.

Pumping water-repelling composition 13 in the borehole is carried out periodically with a periodicity corresponding to increasing the July sampling gas from a well. Thus is preventive waterproofing installation screen 14, preventing lifting (pulling) of the cone 17 plantar brine to the bottom 9 of the hole and overlap them perforations 18 of the casing 7. The well will be operated in a dry mode.

At lower sampling gas from a well in the summer anhydrous mode is stored as waterproofing the screen 14 is not destroyed, and the cone 17 plantar produced water "will fall down and will not rise to the slaughter 9 wells.

With the increase of extraction of gas from the well is destroyed waterproofing screen 14 and the cone 17 plantar produced water can freely rise and approach the bottom 9 of the wells to block the perforations 18 of the casing 7. To avoid this, in the initial period of increase of gas from the well must be re-injected into the reservoir gidrofobiziruyuschey composition 13 in order to restore waterproofing screen 14 and prevent lifting of the cone 17 plantar brine to the bottom 9 of the hole and the perforation holes 18 of the casing 7.

The increase of extraction of gas from the well can occur not only in winter, but in the other period, for example, when the temporary stop of a number of wells for repair or profilactics is their work, then to maintain the total gas production from the field in the remaining wells gas production increase.

To prevent condensation of the well, especially when setting out in the gas stream of water at the mouth placed portable steam installation 19.

An example implementation of the method

It is necessary to conduct preventive waterproofing installation screen 14 to isolate the flow of produced water to the bottom 9 of the well. Drilling depth L=1200 m, the thickness of the productive part of the reservoir H=60 m, height of the cone 17 plantar produced water h=20 m, the porosity of the stratum m=0,17. Pumping water-repelling composition 13 is carried out using coiled tubing equipment without killing the well.

Installation of waterproofing screen 14 have a depth (radius) R=3,0 m, Then the volume of the water-repelling composition 13 will be

V=πR2hm=96,1 m3.

Define bottom-hole pressure in the injection water-repelling composition 13 PC GfK. As the rate of injection water-repelling composition 13 is small, we neglect the pressure losses by friction in the flexible tube 8

PC GfK=Pthe C+10-5·ρW·N.

where Rthe C- pressure at the mouth when pumping water-repelling compositions of 6.0 MPa;

ρW- density water-repelling composition, 700 kg/m

PC GfK=10,2MPa.

Define bottom-hole pressure in the injection of gaseous agent 15 in the ring 10 and annulus 11 space RCg:

PC g=Pu K+10-5·ρW·N,

where Ru K- pressure at the mouth during pumping and squeezing solution (stable gas condensate), and 7.1 MPa;

ρW- the density of the gaseous agent, 560 kg/m3.

ρC g=10,5 MPa.

Thus, install waterproofing screen 14, preventing further advancement (rise) cone 17 plantar brine to the bottom 9 of the hole and the perforation holes 18.

When changing the mode of operation of the well, associated with the increase in gas extraction from wells, and destruction for this reason, waterproofing screen 14 cone 17 plantar produced water again begins to move (rise) in the direction of the bottom 9 of the hole and the perforation holes 18. At this point, a re-injection of hydrophobic compositions 13, which restores waterproofing screen 14 and prevents further rise of the cone 17 plantar brine to the bottom 9 of the hole and the perforation holes 18.

When implementing the described method is able to prevent flooding of the wells, extend the term anhydrous well operation with preservation of the effective thickness of the reservoir, ensure the process safety filtration-capacitive properties of the reservoir in the absence of pollution of bottom-hole formation zone, as well not suppressed, and the upper part of the reservoir is protected from rising water-repelling composition 13 flow into the borehole gaseous agent 15.

The proposed method allows a long time to operate well without the presence of a gas produced water, carry out preventive waterproofing installation screens without killing the well, reducing the degree of pollution of bottom-hole formation zone, to reduce the duration of repair work 5-6 times, reduce costs, and the cost of repairs well in 3-4 times.

1. The way to create a waterproofing screen in the reservoir during the operation of gas and gas condensate wells, equipped and operational Elevator columns, including injection into the reservoir water-repelling composition under pressure, characterized in that the internal cavity of the tubing string under pressure, down to the bottom using coiled tubing installation flexible pipe, open the ring and the annulus of the well, pumped through a flexible tube gidrofobiziruyuschey composition in the required amount while maintaining the annular and annular spaces back pressure exceeds the pressure of the injection water-repelling composition is not less than 10%, push gidrofobiziruyuschey composition into the reservoir at the required depth is at, after which a flexible pipe is then removed from the wells, and the pumping water-repelling composition is conducted periodically, at times of increased withdrawals from gas wells without plugging these wells.

2. The method according to claim 1, characterized in that the amount of injected water-repelling compositions take depending on the thickness of the layer and the depth of installation of the waterproofing of the screen.

3. The method according to claim 1, characterized in that the pressure in the annular and annular spaces create gaseous agent from neighboring wells, or gas, or nitrogen-booster installation, or from the internal combustion engine.



 

Same patents:

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8 cl, 4 tbl, 5 dwg, 1 ex

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20 cl, 5 ex, 3 tbl

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3 dwg

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4 dwg

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SUBSTANCE: invention relates to oil and gas production industry, particularly to construction of oil and gas well clusters in underground maltha sand deposits and heavy high-viscosity oil fields. The method includes dropping a pipe string with a divertor at its end into the casing column within the interval required, cutting the casing column, successive formation of main process channels over the perimeter of the casing column by turning the divertor with the aid of a flexible pipe with a nozzle at its end, thus forming a number of main process channels. The casing column is cut by the cutter over the whole perimeter of the column in two places so that it is possible to form process channels within one seam. The divertor is fixed in the casing column so that outlet openings of main process channels are arranged within one slot in the casing column. The lower end of the flexible pipe is fitted with filters interconnected by flexible links. The lower filter is connected with the nozzle and the upper one is equipped with a packer. After formation of each main process channel and inserting all filters into it the circular space between the upper filter and the process channel is plugged with the packer. The flexible pipe is disconnected from the filters with the nozzle and is withdrawn out of the well. Then it is fitted with similar filters with the nozzle and the next main process channel is formed. On completion of formation of a group of main process channels the divertor is released and is fixed below or above the initial place of mounting in the casing column so that it is possible to turn it through a certain angle and to form additional group of process channels similar to the main ones within the limits of the second slot in the casing column. On completion of formation of the group of additional process channels and withdrawal of the divertor the process pipe string is dropped into the casing column and the packer is mounted.

EFFECT: reduction of material and financial costs and increased efficiency of operation of the multi-shaft well.

3 dwg

FIELD: petroleum industry.

SUBSTANCE: invention relates to the oil and gas production industry, particularly to construction of oil and gas well clusters. The method includes cutting the casing column within the interval required, dropping pipes with the diverter into the casing column, successive formation of process channels over the perimeter of the casing column, by means of the flexible pipe lowered on the additional pipe string with a nozzle, successively, by turning the diverter thus forming a number of process channels over the perimeter. Prior to being dropped into the well the flexible pipe is fitted with filters, the filtering openings of which are plugged with acid-soluble material. After formation of the process channel the flexible pipe is disconnected from the additional pipe string and the pipe remains in the process channel. Then the additional pipe string is withdrawn out of the well and the next flexible pipe with filters is installed and after turning the divertor through a certain angle the next process channel is formed, similar to the first one. Then the procedure is repeated. After formation of the last process channel acid is injected into all process channels for dissolution of acid-soluble material of filters.

EFFECT: increased efficiency of operation of the multi-shaft well.

1 dwg

FIELD: petroleum industry.

SUBSTANCE: invention relates to the oil production industry, particularly to construction of oil and gas well clusters. The method includes cutting the casing column within the interval required, dropping pipes with the diverter into the casing column within the interval required, successive formation of process channels over the perimeter of the casing column in the productive seam by means of the flexible pipe with a nozzle, successive formation of a number of process channels over the perimeter over the perimeter by turning the diverter. After formation of process channels flexible links are inserted successively into the pipe string by means of the divertor. The links are fitted with filters, the openings of which are plugged with acid-soluble material and additionally with a blind nozzle at the end, the diameter of the additional nozzle being smaller than that of the main nozzle. After installation of flexible links with filters in the process channel they are disconnected from the additional pipe string, which is withdrawn successively out of the well for installation of similar flexible links with filters to be inserted into the next process channel. After flexible links with filters are inserted in the last process channel acid is injected into all process channels for dissolution of acid-soluble material of filters. The invention provides increased efficiency of operation of the multi-shaft well.

EFFECT: increased efficiency of operation of the multi-shaft well.

2 dwg

FIELD: oil and gas.

SUBSTANCE: present invention relates to the oil recovery, namely to means of affecting the near wellbore payzone region (NWPR). A gage, recording equipment (RE), and NWPR treatment means, for example, a perforating gun with a perforation cable are run in the well in sequence, and depth positioning to the well log and well structure is carried out; the NWPR temperature and pressure are recorded. After that, the NWPR treatment is carried out, for example, perforating-explosive operations (PEO), i.e. the perforation of the well column, while simultaneously recording pressure and temperature and determining the well structure. Gaging is carried out simultaneously with the depth positioning to the well log and well structure. The gage is coupled with the RE on a wireline installed above the gage and providing for the measurement of temperature and pressure, the application and recording of the magnetic mark on the well production casing, the well structure determination, and the measurement of well rock radioactivity. The magnetic mark is set on the production casing by sending a current pulse or a command from the surface to the casing collar locator in the RE, and positioning to the nearest collar at a distance of no more than 5-7 m from the treatment interval is carried out. The temperature and pressure are recorded with simultaneous data transmission to the surface, and the said coupling is lifted. The following stage involves running the RE coupled with the NWPR treatment means, for example, with a perforation cable and a perforating gun in the well, while simultaneously monitoring the coupling passing to the magnetic mark set, the NWPR treatment being carried out in the interval required.

EFFECT: increased accuracy and efficiency of perforating-explosive operations (PEO) due to good positioning of explosive equipment relative to well log and real-time perforation monitoring.

3 cl, 3 dwg

FIELD: oil and gas.

SUBSTANCE: present invention relates to the oil recovery, namely to means of affecting the near wellbore payzone region (NWPR). A gage, recording equipment (RE), and NWPR treatment means, for example, a perforating gun with a perforation cable are run in the well in sequence, and depth positioning to the well log and well structure is carried out; the NWPR temperature and pressure are recorded. After that, the NWPR treatment is carried out, for example, perforating-explosive operations (PEO), i.e. the perforation of the well column, while simultaneously recording pressure and temperature and determining the well structure. Gaging is carried out simultaneously with the depth positioning to the well log and well structure. The gage is coupled with the RE on a wireline installed above the gage and providing for the measurement of temperature and pressure, the application and recording of the magnetic mark on the well production casing, the well structure determination, and the measurement of well rock radioactivity. The magnetic mark is set on the production casing by sending a current pulse or a command from the surface to the casing collar locator in the RE, and positioning to the nearest collar at a distance of no more than 5-7 m from the treatment interval is carried out. The temperature and pressure are recorded with simultaneous data transmission to the surface, and the said coupling is lifted. The following stage involves running the RE coupled with the NWPR treatment means, for example, with a perforation cable and a perforating gun in the well, while simultaneously monitoring the coupling passing to the magnetic mark set, the NWPR treatment being carried out in the interval required.

EFFECT: increased accuracy and efficiency of perforating-explosive operations (PEO) due to good positioning of explosive equipment relative to well log and real-time perforation monitoring.

3 cl, 3 dwg

FIELD: oil and gas.

SUBSTANCE: present invention relates to the oil and gas industry, namely to the well field. The set of devices for well perforation contains perforating gun sections connected between themselves, a casing, supporting and guiding components. The casing wall has horizontal tapered openings and protection rings coaxial with the horizontal openings. The cylindrical surfaces of the perforating gun section shells are furnished with through slots consisting of a conical part and a longitudinal part, so that the conical parts of the adjacent slots form a conical ledge. The shell has horizontal openings and a vertical axial opening, white the adjacent section shell ends have a flexible coupling attached thereto and consisting of a sphere and a shell assembled of two parts and encircling the sphere. The horizontal openings of the perforating gun section shells are connected to a compressed air feeding hose by a vertical opening.

EFFECT: simplified design of perforating gun, increased reliability, efficiency of hole perforation in casings and formation.

5 dwg

FIELD: oil and gas.

SUBSTANCE: present invention relates to the oil and gas industry, namely to the well field. The set of devices for well perforation contains perforating gun sections connected between themselves, a casing, supporting and guiding components. The casing wall has horizontal tapered openings and protection rings coaxial with the horizontal openings. The cylindrical surfaces of the perforating gun section shells are furnished with through slots consisting of a conical part and a longitudinal part, so that the conical parts of the adjacent slots form a conical ledge. The shell has horizontal openings and a vertical axial opening, white the adjacent section shell ends have a flexible coupling attached thereto and consisting of a sphere and a shell assembled of two parts and encircling the sphere. The horizontal openings of the perforating gun section shells are connected to a compressed air feeding hose by a vertical opening.

EFFECT: simplified design of perforating gun, increased reliability, efficiency of hole perforation in casings and formation.

5 dwg

FIELD: oil and gas.

SUBSTANCE: present invention relates to the oil and gas industry. The method involves mechanical exposing of a formation by making openings, running a blast perforating gun into the well, and blasting its charges. Mechanical formation exposing is performed by hydromechanical guns, by making no less than two openings per a running metre of the perforation interval, with a cross-section area of 4.5-5 cm2 each, and burrs at the top and bottom of the openings, providing stress concentration and damping of mechanical waves after the charges of the blast-type gun are blast, and forming additional tunnels in the burr area.

EFFECT: increased payzone exposing efficiency.

2 cl, 1 dwg

FIELD: oil extractive industry.

SUBSTANCE: method includes lowering a tail piece into well with temperature, electric conductivity and pressure sensors placed on tail piece along its length. Pressure sensors are used in amount no less than three and placed at fixed distances from each other. After that, continuously during whole duration of well operation between maintenance procedures, temperature, conductivity of well fluid, absolute value of face pressure and difference of pressures along depth of well in area of productive bed are recorded. Different combinations of pairs of pressure sensors are used for determining special and average values of well fluid density. When absolute pit-face pressure is lower then saturation pressure for well fluid by gas and/or when average values of density deviate from well fluid preset limits and/or when its conductivity deviates from preset limits, adjustment of well operation mode is performed.

EFFECT: higher efficiency, higher safety.

2 cl

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