RU2634317C1 - Method of controlled injection of liquid through formation (versions) - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention can be used in simultaneous-separate quench (SSQ) of liquid in one or several formations of a well. An arrangement of underground equipment (UEA) is lowered into the well, according to the first version, it is equipped with a plug, a pressure equalisation valve, an above-packer safety unit, lower and upper well chambers representing injection distributing devices (IDD) and provided with removable union elements, the liquid is supplied to tubing cavity, the flowmeters are lowered on geophysical cable and liquid consumption of the upper layer is calculated as difference between measured total flow rate of liquid for two formations and flow rate of lower formation, the geophysical cable is lifted. According to the second version, the UAE is equipped with the pressure equalisation valve, the above-packer safety unit, the lower and upper well chambers, the lower and upper IDD are placed without removable union elements under the lower and upper packers, respectively, at that the removable piece element of the lower well chamber is made with geophysical cable sealing, on the wellhead the geophysical cable is equipped with an upper instrument and laid successively through the upper and lower extracted union elements, the geophysical cable is sealed in the lower union element, then the lower instrument is set in the lower part of the geophysical cable, the upper and lower removable union elements are lowered and installed in series into the body part of corresponding IDD, the fluid is supplied to the tubing cavity, geophysical surveys are carried out.

EFFECT: possibility of levelling the under-packer and inter-packer pressures, successive extraction of the upper and then the lower packers in case of a tack, ease of changing the volumes of the fluid injection, performing geophysical surveys of the well in continuous mode, or if necessary.

2 cl, 4 dwg

Description

The invention relates to the oil industry and can be used for simultaneous-separate injection (ARI) of fluid in one or more layers of one well.

The known method of Sharifov for simultaneous-separate and alternate operation of formations with one injection well, selected as an analogue, including the descent into the well of at least one pipe string with a constant or variable diameter without or with a plugged end, with at least one run-off below the upper layer, a packer of hydraulic and / or mechanical action without or with a column disconnector. Below and above the packer, at least one landing unit in the form of a borehole chamber or a nipple with a removable valve for lowering the working agent through them into the lower and upper layers, landing the packer and crimping it from below and / or above, is lowered. During crimping, the minimum absorption pressure of each formation is determined. The working agent is pumped from the mouth into the cavity of the pipe string at a given pressure, directing it to the upper and / or lower layers through the corresponding removable valves in the landing nodes. The total consumption of the working agent, wellhead pressure and / or temperature in the cavity of the pipe string and the annulus of the well are measured on the surface. The bottomhole pressure of the upper layer, the pressure in the pipe string and the annulus at the depth of the removable valve in the seat assembly above the packer are determined. Find the flow rate of the working agent injected into the upper layer through a removable valve, subtract it from the total and determine the flow rate of the working agent injected into the lower layer. Compare the actual costs of the working agent for the formations with their design values. In this case, when they differ, the wellhead pressure is changed and / or removable valves are removed for one or both layers from the landing nodes using cable technology. Their characteristics and / or parameters are determined and changed. After that, each removable valve is re-installed in the corresponding landing unit using cable technology and the injection of the working agent through them into the corresponding layers is continued (patent No. 223003009, publ. 05.27.2005).

The disadvantages of this method is that the removable valves used to supply the working agent, respectively, in the lower and upper layers, are installed misaligned with the borehole chambers, which causes difficulties in their installation, removal and replacement. Another disadvantage is the lack of equalization of sub-packer and interpacker pressures.

The known method and device for controlled injection of fluid into the reservoirs, selected as an analogue, including descent into the well on a string of tubing - tubing configuration, including a lower packer, disconnector, injection distribution device - URZ, upper packer, disconnector. The lower part of the layout is equipped with a funnel or shank, and the upper part of the layout is equipped with an extension. A centralizer sub is installed above the lower and upper packers. Install and compact packers. Lower the depth meter with the plug above the last seat. They supply fluid to the tubing, determine the total fluid flow. Lower the cork into the seat, supply fluid to the tubing, determine the flow rate of the fluid pumped into the lower layer. Subtract it from the total flow rate and find the flow rate of the fluid pumped into the upper reservoir. The actual fluid flow rates for the formations are compared with predetermined values. With their difference, the extracted part of the URZ is raised to the surface. Install the upper and lower fittings in the seats. The extracted part of the URZ is lowered into the tubing before its landing in the hull of the URZ. Carry out adjustable injection in the reservoirs. To isolate one of the layers, a plug is installed instead of the fitting. At the end of the work, the installation is hoisted. URZ includes a body part consisting of a nipple with several through channels, a body and an adapter sleeve, an extractable part consisting of an upper and lower sleeve and a diffuser. Seats under the upper and lower fittings or caps are made in the upper sleeve and diffuser. In the upper sleeve there is a seat for the cork. The upper and lower central channels, diverging and converging channels are made in the lower sleeve (patent No. 2495235, publ. 10.10.2013, the patent holder is the applicant).

The disadvantages of this method are: the lack of the ability to conduct geophysical surveys of wells in a constant mode and equalization of subpacker and interpacker pressures.

A known installation for simultaneous and separate operation of a well and a well chamber for it, selected as a prototype, including a tubing string with a disconnecting packer, a well chamber with a fitting. According to the invention, the borehole chamber is a hollow tube with through radial holes made in its cylindrical surface. Each tube is installed on the tubing string coaxially with it. To do this, in its upper and lower parts it is made with means of connection with the pipes of the column. The through radial holes of each tube are located at its formation. The inner surface of each tube is made with a landing seat for its fitting. The inner diameter of the tube is less than the inner diameter of the tubing string. Inside each tube, on its inner cylindrical surface, a cylindrical fitting is sealed coaxially with it, the cylindrical surface of which is provided with a through (s) radial (s) hole (s) matching (s) with the radial holes of the tube. The diameters of the inner, outer surface of the fitting, the inner surface of the tube is larger than the corresponding dimensions of the downstream fitting and tube (patent 2473791, publ. 01.27.2013).

The disadvantages of this method are the lack of capabilities: equalization of sub-packer and interpacker pressures, sequential extraction of the upper and then lower packers in case of sticking, conducting geophysical research of wells in a constant mode.

The problem solved by the invention is the ability to equalize the sub-packer and inter-packer pressures, sequentially extracting the upper and then lower packers in the event of a sticking, ease of changing the volume of fluid injected, conducting geophysical exploration of the well in constant mode or if necessary.

The problem is solved in that the KPO (according to the first embodiment) is equipped with a plug, a pressure balancing valve, an over-packer safety unit, lower and upper borehole chambers, which are injection distribution devices (URZ) and have recoverable choke elements, supply fluid to the tubing cavity, release flowmeters on the geophysical cable and find the flow rate of the upper layer as the difference between the measured total flow rate of the two layers and the flow rate of the lower layer, lift the geophysical cable whitewash, when the actual liquid flow rates differ from the set values, only the upper or lower and upper removable choke elements are lifted from the body of the corresponding URZ using a fishing tool, wire or coiled tubing, the extracted choke elements are inspected, and then only the upper or successively lower and the upper retrievable fitting elements in the tubing before they fit into the body of the corresponding URZ, successively raise the upper and lower the removable choke elements of the corresponding URZ using a fishing tool, wire or coiled tubing installation, then the recoverable choke element of the lower URZ with the plugged side hole in the tubing is discarded before it fits into the body of the lower URZ, then the recoverable choke element of the upper URZ with the required diameter of the side hole is discarded and they carry out the injection only into the upper layer, successively raise the upper and lower recoverable choke elements of the corresponding URZ using fishing tool, wire or coiled tubing installation, then dump the recoverable fitting element of the lower URZ with the required diameter of the side hole until it fits into the body of the lower URZ, then the recoverable fitting element of the upper URZ with the plugged through section of the side hole is dumped and only the lower layer is pumped. KPO (according to the second option) is equipped with a pressure equalization valve, an over-packer safety unit, lower and upper borehole chambers, which are URZ and having removable choke elements, place the lower and upper URZ without removable choke elements under the lower and upper packers, respectively, with the choke being removed the lower borehole chamber is performed with a sealer of the geophysical cable, at the mouth the geophysical cable is equipped with an upper device and laid sequentially through the upper and the lower extractable fitting elements, seal the geophysical cable in the lower fitting element, then the lower device is installed in the lower part of the geophysical cable, the upper and lower removable fitting elements are lowered and installed sequentially into the body of the corresponding URZ, fluid is supplied into the tubing cavity, geophysical studies are carried out, when differences between the actual fluid flow rate and the setpoints are raised on the geophysical cable to the surface of the lower and upper removable nozzle simultaneously Needed elements from the body part of the corresponding URZ, carry out the audit of the extracted fitting elements, then lower and the geophysical cable down the upper and lower removable fitting elements of the corresponding URZ into the tubing, then fluid is supplied into the tubing cavity and geophysical surveys are carried out, the lower bottom is subsequently lifted along with the geophysical cable and the upper retrievable choke elements of the corresponding URZ to the surface, then at the same time the retrievable choke element is lowered into the tubing on a geophysical cable t of the upper URZ with the required diameter of the side hole and the recoverable fitting element of the lower URZ with the plugged side hole in the tubing until they fit into the body of the upper and lower URZ, respectively, and only the upper layer is pumped, the lower and upper removable chokes are lifted together with the geophysical cable the elements of the corresponding URZ to the surface, then at the same time they lower into the tubing on a geophysical cable a retrievable fitting element of the upper URZ with a muffled side section Vågå holes and removable lower choke element PSR with the required diameter of the lateral hole to fit them into the body portion of the upper and lower, respectively, and PSR is performed only in the lower injection layer.

The ability to equalize sub-packer and inter-packer pressures is achieved by equipping the KPO with a pressure equalization valve.

Sequential removal of the upper and then lower packers in the event of a sticking is achieved by installing an over-the-counter safety unit.

The ease of changing the fluid injection volumes is achieved by removing, revising and replacing only the upper or sequentially upper and lower extractable fitting elements from the body of the corresponding URZ using standard geophysical equipment, wire or coiled tubing.

Conducting geophysical studies of the well in a constant mode or, if necessary, is achieved due to the possibility of sealing the geophysical cable in the lower recoverable fitting element of the URZ.

In FIG. Figure 1 shows the KPO scheme for implementing the method of controlled fluid injection into formations without a geophysical cable. In FIG. Figure 2 shows the KPO scheme for implementing the method of controlled fluid injection through formations with a geophysical cable. In FIG. 3 shows a diagram of a downhole chamber without a geophysical cable seal. In FIG. 4 is a diagram of a lower borehole chamber with a seal of a geophysical cable.

According to the first embodiment, KPO (Fig. 1) includes a plug 1, a lower borehole chamber 2 with a lower removable choke member 3, a lower packer 4, an interpacker safety assembly 5, an upper borehole chamber 6 with an upper removable choke member 7, an upper packer 8, a pressure balancing valve 9 and an over-packer safety assembly 10. A lower packer 4 is located above the lower borehole chamber 4. An interpacker safety assembly 5 is placed above a lower packer 4. An upper borehole chamber 6 is located under the upper packer 8. A pressure balancing valve 9 is placed n below the lower packer 4 and serves to equalize and the packer mezhpakernogo pressures. The over-packer safety assembly 10 is located above the upper packer 8 and serves for sequentially removing the upper 8, and then the lower 4 packers in case of sticking.

The lower 2 and upper 6 borehole chambers are URZ, which consist of a hull and recoverable parts and are used to control the volume of fluid injected into the lower and upper layers. The lower 2 and upper 6 borehole chambers (Fig. 3) have lower 3 and upper 7 removable choke elements (Figs. 3, 4) with side holes 11, grooves for fishing tool 12 and sealing elements 13. Lower 2 and upper 6 and borehole the chambers are inserted into the body of the URZ to the seat 14. The recoverable fitting element 3 of the lower borehole chamber 2 is made without a sealant 15 of the geophysical cable 16.

The implementation of the method is given in the description of the operation of KPO.

Before launching the assembly, the wells are modeled (not shown in FIG.) And the casing walls are cleaned with scrapers (scrapers) (not shown in FIG.), And then the wellbore is flushed.

KPO is assembled in the following sequence: plug 1, lower borehole chamber 2 with removable choke element 3, pressure balancing valve 9, lower packer 4, interpacker safety unit 5, upper borehole chamber 6 with extractable choke element 7, upper packer 8, over-packer safety unit 10.

Then KPO is lowered on the tubing string into the wellbore. Then the mouth is equipped with wellhead fittings (not shown in Fig.). Install and check the tightness of the lower 4 and upper 8 packers.

Liquid is supplied into the cavity of the tubing string.

Flowmeters are run on standard geophysical equipment and geophysical studies are carried out: they find the fluid flow rate of the upper reservoir as the difference between the measured total fluid flow for the two reservoirs and the flow rate of the lower reservoir, and lift the standard geophysical equipment.

If the actual liquid flow rates differ from the set values, only the upper 7 or successively upper 7 and lower 3 are lifted out of the recoverable choke elements from the body of the corresponding URZ using a fishing tool, wire or coiled tubing, the recoverable choke elements are inspected, and then only the upper 7 or consistently lower 3 and upper 7 removable fitting elements in the tubing before they fit into the body of the corresponding URZ.

For injection only in the upper layer, the upper 7 and lower 3 are removed successively by the recoverable choke elements of the respective URZ using a fishing tool, wire or coiled tubing, then the first recoverable choke element 3 of the lower URZ with the plugged side hole 12 in the tubing is dropped before it is inserted into the case part of the lower URZ, then discard the recoverable fitting element 7 of the upper URZ with the required diameter of the side hole 12.

For injection only in the lower layer, successively raise the upper 7 and lower 3 removable choke elements of the corresponding URZ using a fishing tool, wire or coiled tubing, then discard the recoverable choke element 3 of the lower URZ with the required diameter of the side hole 12 before it fits into the lower part of the body URZ, then discard the retrievable fitting element 7 of the upper URZ with a muffled passage section of the side hole 12.

If necessary, equalize the under-packer and inter-packer pressures using the pressure equalization valve 9.

According to the second variant, the KPO (Fig. 2) consists of a plug 1, a lower borehole chamber 2 with a removable choke element 3, a pressure equalization valve 9, which serves to equalize the sub-packer and inter-packer pressures, the lower packer 4, the inter-packer safety unit 5, the upper borehole chamber 6 with a removable fitting element 7, an upper packer 8, an over-packer safety assembly 10. The removable fitting element 3 (Fig. 4) of the lower borehole chamber 2 is additionally equipped with a sealant 15 of the geophysical cable 16, which is made with the lower 17 and hnim 18 devices that allows for well logging in continuous mode or as needed.

The implementation of the method is given in the description of the operation of KPO.

Before launching the assembly, the wells are modeled (not shown in FIG.) And the casing walls are cleaned with scrapers (scrapers) (not shown in FIG.), And then the wellbore is flushed.

According to the second option, the KPO is assembled in the following sequence: lower well chamber 2, pressure equalization valve 6, lower packer 2, interpacker safety unit 3, upper well chamber 4, upper packer 5, overpack safety unit 7. The lower 2 and upper 6 well chambers are assembled without bottom 3 and top 7 removable fitting elements.

Then KPO is lowered on the tubing string into the wellbore. Then the mouth is equipped with wellhead fittings (not shown in Fig.). Install and check the tightness of the lower 2 and upper 5 packers.

Then the geophysical cable 16 is equipped with an upper device 18 and laid sequentially through the upper 7 and lower 3 removable fitting elements. After that, the cable 16 is sealed in the seal 15 of the lower fitting element 3, then the lower device 17 is installed in the lower part of the geophysical cable 16.

The geophysical cable 16 is lowered into the tubing along with the lower 3 and upper 7 removable choke elements.

Liquid is supplied to the tubing string cavity and geophysical surveys are carried out.

If the actual liquid flow rates differ from the set values, they are lifted on the geophysical cable 16 to the surface in sequence lower 3 and upper 7 removable fitting elements from the body of the corresponding URZ. Then carry out the audit of the lower 3 and upper 7 of the extracted fitting elements. Then they carry out the descent together with the geophysical cable 16 at the same time of the upper 7 and lower 3 of the extracted fitting elements and landing in the saddles 14 of the corresponding URZ. Then, liquid is supplied to the tubing cavity and geophysical studies are performed.

In order to pump only into the upper layer (not shown in FIG.), Together with the geophysical cable 16, successively lower 3 and upper 7 are removed, the recoverable choke elements of the corresponding URZ are brought to the surface, then they are simultaneously lowered into the tubing on the geophysical cable 16, the recoverable choke element 7 of the upper URZ with the required diameter of the side hole 11 and the removable fitting element 3 of the lower URZ with the muffled side hole 11 in the tubing before they fit into the body of the upper and lower URZ, respectively.

For injection only into the lower layer (not shown in FIG.), The lower 3 and upper 7 are removed in sequence with the geophysical cable 16, the recoverable choke elements of the corresponding URZ are brought to the surface, then at the same time, the extracted chock element 7 of the upper URZ with the plugged down is lowered into the tubing on the geophysical cable the bore of the side hole 11 and the fitting element of the lower URZ with the required diameter of the side opening 11 before they fit into the body of the upper and lower URZ, respectively.

If necessary, equalize the under-packer and inter-packer pressures using the pressure equalization valve 9.

After carrying out work on pumping liquid, KPO is removed to the surface: for this, by tensioning the tubing string, first upper 8, then lower 4 packers are transferred to the transport position.

Thus, the claimed invention allows to equalize the sub-packer and interpacker pressures, sequentially extract the upper and then lower packers in case of sticking, simply change the fluid injection volumes, conduct geophysical studies of the well in a constant mode or if necessary.

Claims (2)

1. The method of controlled injection of fluid into the reservoirs, including the descent into the well on a string of tubing (tubing) layout of underground equipment (KPO), including the lower borehole chamber, the lower packer, interpacker safety unit, the upper borehole chamber, the upper packer, the installation of the lower and top packers, pressure testing, fluid supply to the tubing cavity, geophysical surveys, comparison of actual fluid flow rates with predetermined values, after carrying out fluid injection work e KPO to the surface, characterized in that the KPO is equipped with a plug, a pressure balancing valve, an over-packer safety unit, lower and upper borehole chambers, which are injection distribution devices (URPs) and have recoverable choke elements, supply fluid to the tubing cavity, and flow meters are lowered on the geophysical cable and find the flow rate of the upper layer as the difference between the measured total flow rate of the two layers and the flow rate of the lower layer, lift the geophysical cable For, if the actual liquid flow rates differ from the set values, only the upper or lower and the upper and lower removable choke elements are lifted from the body of the corresponding URZ using a fishing tool, wire or coiled tubing, the extracted choke elements are inspected, and then only the upper or successively lower and the upper removable fitting elements in the tubing before they fit into the body of the corresponding URZ, successively raise the upper and lower and attracted choke elements of the corresponding URZ using a fishing tool, wire or coiled tubing, then discard the recoverable choke element of the lower URZ with the plugged side hole into the tubing before it fits into the body of the lower URZ, then discard the recoverable choke element of the upper URZ with the required diameter of the side hole and carry out the injection only into the upper layer, successively raise the upper and lower recoverable choke elements of the corresponding URZ using fishing and strument, wire or coiled tubing unit, then extracted reset choke element lower PSR with the required diameter of the lateral hole to its landing in the lower body portion of PSR, then extracted reset choke element with upper PSR plugged flow section side opening and injection is performed only in the lower layer. 2. A method of controlled fluid injection into formations, including descent into a well on a tubing string of underground equipment (KPO), including a lower borehole chamber, a lower packer, an interpacker safety unit, an upper borehole chamber, an upper packer, a lower installation and top packers, pressure testing, fluid supply to the tubing cavity, geophysical surveys, comparison of actual fluid flow rates with predetermined values, after carrying out fluid injection work e KPO on the surface, characterized in that the KPO is equipped with a pressure equalization valve, an over-packer safety unit, lower and upper borehole chambers, which are injection distribution devices (URZ) and have extractable choke elements, place the lower and upper URZ without extractable choke elements under the lower and upper packers, respectively, whereby the recoverable fitting element of the lower well chamber is made with a sealer of a geophysical cable, at the mouth the geophysical cable is equipped with an upper with a rib and laid sequentially through the upper and lower removable choke elements, seal the geophysical cable in the lower choke element, then install the lower instrument in the lower part of the geophysical cable, lower and install the upper and lower choke elements in the case of the corresponding URZ, and supply liquid to the cavity Tubing, carry out geophysical studies, with a difference in the actual fluid flow from the set values, they are raised on a geophysical cable on a the surface at the same time the lower and upper removable choke elements from the body of the corresponding URZ, carry out the audit of the removed choke elements, then lower and the geophysical cable down the upper and lower recoverable choke elements of the corresponding URZ into the tubing, then fluid is supplied into the tubing cavity and geophysical surveys are carried out, raised together with the geophysical cable, the lower and upper recoverable choke elements of the corresponding URZ are subsequently brought to the surface, then simultaneously lowered into Tubing on a geophysical cable, a recoverable fitting element of the upper part with the required diameter of the lateral hole and a recoverable fitting element of the lower part with the plugged side hole into the tubing before they fit into the body of the upper and lower part, respectively, and pump only into the upper layer, they are lifted together with the geophysical cable successively lower and upper retrievable choke elements of the corresponding URZ to the surface, then at the same time the retrievable choke e is lowered into the tubing on a geophysical cable an upper URZ element with a muffled bore of the side hole and a removable fitting element of the lower URZ with the required diameter of the side hole before they fit into the body of the upper and lower URZ, respectively, and only pump into the lower layer.

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