RU183771U1 - EQUIPMENT WELL EQUIPMENT FOR SIMULTANEOUS PRODUCTION OF THERMAL WATERS AND THEIR PUMPING THEM IN A LAYER WITH DIFFICULT OIL - Google Patents

Abstract

The task of creating a useful model is the possibility of creating conditions for using the thermal properties of thermal waters located lower in the geological section of the reservoir with hard to recover oil, and pumping them into the productive horizon in order to heat the rock and reduce the viscosity of oil.

EFFECT: creation of a reliable design of an injection well for simultaneous production of thermal waters and injection into a reservoir with hard-to-recover oil.

The problem and the technical result achieved are solved in that the design of the injection well includes a direction, a conductor, a production string, characterized in that an electric centrifugal pump (ESP) with a cable is lowered (bottom-up) to the tubing string (tubing), damage indicator cables with depth sensors for measuring pressure and temperature at the intake and discharge of the ESP, ESP knock-off valve, landing nipple for installing plugs, mechanical action packer, circulation valve, packer porn with hydraulic anchor, landing nipple for the downhole fitting, a set of downhole chambers with valves for water injection, a persistent packer, non-return valve, a tubing string disconnector and a temperature compensator.

Description

The proposed utility model relates to the oil industry, and in particular, to equipment for injection wells drilled in formations with hard-to-recover oil (for example, oil from the Bazhenov formation).

A characteristic feature of the current stage of development of the oil and gas industry in Russia is the transition of many developed large oil fields to the stage of declining production. The urgent issue is the development of small deposits characterized by a complex geological structure, small recoverable reserves of oil (less than 10 million tons) and gas (less than 10 billion m), high sulfur and high viscosity oils (BBH), low reservoir pressures and gas saturation.

The term “hard-to-recover reserves” (TRIZ) first appeared in the late 70s of the XX century, and over the past period a lot of experience has been accumulated in studying the problem. Ideas have been formed about TRIZ, which are contained in deposits or parts of deposits characterized by unfavorable geological conditions for the occurrence of hydrocarbons for oil, its abnormal physical properties, quantitative criteria are formulated for classifying reserves in this category.

Features of the development of small fields of high-viscosity oil cause a number of problems that oil companies face. First of all, these include complications in the operation of oilfield equipment, a decrease in the overhaul period of operation of ground and downhole equipment, equipment failure due to increased loads, low profitability of well operation, problems of utilization and rational use of associated petroleum gas, and, as a result, extremely low profitability development and operation of the field.

The urgent task of the cost-effective development of small fields of high-viscosity oil is to develop new and improve the applied methodological and technological solutions that reduce operating and energy costs in the production, collection and preparation of well products, increase the overhaul period of oilfield equipment by preventing complications in the production of high-viscosity oil.

Equipment of injection wells is known, which contains a production string perforated on a reservoir and wellhead fittings, on which a pipe string is suspended with a shoe deflated above the production string perforation interval [V.A. Eronin, A.A. Litvinov et al. Operation of waterflooding systems. "Bowels": M., 1967 with. 219-227, fig. 95, 100]. From the wellhead, water is supplied through a pipe string into the formation. Commercial water containing up to 60 m g / l of oil is pumped into injection wells.

The disadvantage of this equipment is that it does not provide for the possibility of simultaneous production of thermal waters located downstream of the geological section of the reservoir with hard-to-recover oil and pumping them into the productive horizon in order to warm up and reduce the viscosity of the oil.

It is known equipment for simultaneously separately injecting water into several layers through one well, including a pipe string with a packer installed between the layers, and a cross coupling hydraulically connecting the internal cavity of the pipe to the over-packer annulus of the well (the space between the wall of the well and the pipe string) [R.A . Maksutov, B.E. Dobroskov, Yu.V. Zaitsev. Simultaneous and separate exploitation of multilayer oil fields. "Bowels": M., 1974 with. 166-196].

The disadvantage of this equipment is that it does not provide for the possibility of simultaneous production of thermal waters located downstream of the geological section of the reservoir with hard-to-recover oil and pumping them into the productive horizon in order to warm up and reduce the viscosity of the oil.

The closest technical solution selected for the prototype is the equipment for separate injection of fluid in multilayer fields, which contains at least one pipe string with at least one packer lowered below the upper layer 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. 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 units (RF Patent No. 22253009, publ. 27.05.2005).

The disadvantage of this equipment is that it does not provide for the possibility of simultaneous production of thermal waters located downstream of the geological section of the reservoir with hard-to-recover oil and pumping them into the productive horizon in order to warm up and reduce the viscosity of the oil.

The task of creating a useful model is the possibility of creating conditions for using the thermal properties of thermal waters located downstream of the geological section of the reservoir with hard-to-recover oil and pumping them into the productive horizon in order to heat the rock and reduce the viscosity of the oil.

EFFECT: equipment for injection wells, which allows simultaneously extracting thermal waters and pumping them into a formation with hard-to-recover oil.

The task and the technical result achieved are solved by the fact that the equipment for injection wells, which allows simultaneous production of thermal waters and pump them into a reservoir with hard-to-recover oil, includes a tubing string - tubing, on which an electric centrifugal pump - ESP with cable, indicator of damage to cables with depth sensors for measuring pressure and temperature at the intake and ejection of the ESP, valve for draining fluid from the tubing string when raising the ESP, landing nipp for installing plug plugs, a mechanical action packer for installing a horizon with thermal waters at the roof, a circulation valve for communicating the annulus with the tubing cavity and injecting interpacker fluid, a persistent packer with a hydraulic anchor for installation at the bottom of the oil reservoir, a landing nipple for the downhole fitting , well chambers with valves for injecting thermal water into the oil reservoir, a resistant packer for installation near the roof of the oil reservoir, a check valve to prevent the rise of thermal water to the earth's surface, tubing string disconnector and temperature compensator.

The essence of the proposed utility model is presented in FIG. one.

Equipment for injection wells, which allows simultaneous production of thermal water and injects it into a reservoir with hard-to-recover oil, includes a tubing string 1, on which an electric centrifugal pump 2 with a cable is lowered from bottom to top, a cable damage indicator with depth sensors for measuring pressure and temperature at the intake and discharge of the ЭЦН 3, valve 4 for draining the liquid from the tubing string when raising the ЭЦН, landing nipple 5 for installing the plug-plug, mechanical action packer 6 for installation near the roof of the horizon with thermal waters, a circulation valve 7 for communicating the annular space with the tubing cavity and injecting the interpacker fluid, a persistent packer 8 with a hydraulic anchor for installation at the bottom of the oil reservoir, a landing nipple for the downhole fitting 9, downhole chambers 10 with valves for the thermal injection water into the oil reservoir, persistent packer 11 for installation near the roof of the oil reservoir, non-return valve 12 to prevent the rise of thermal water to the earth's surface, tubing disconnector 13, temperature room pensioner 14. Equipment is installed as follows.

The tubing string 1 is lowered with an ESP 2 with a cable, a cable damage indicator with depth sensors for measuring pressure and temperature at the intake and ejection of the ESP 3, a valve 4 for draining the fluid from the tubing string when raising the ESP, landing nipple 5, mechanical action packer 6, circulation a valve 7, a persistent packer 8 with a hydraulic anchor, a landing nipple for a downhole fitting 9, downhole chambers 10 with valves for injecting thermal water, a persistent packer 11, a check valve 12, a tubing disconnector 13 and a temperature compensator orom 14.

The distance between the packers 8 and 11 must be observed so that the packer 11 is located in the well at the top of the formation in hard to recover oil, and the packer 8 at the bottom of the formation in hard to recover oil. Packer 6 must be installed at the top of the horizon with thermal waters below the geological section of the reservoir with hard-to-recover oil.

After lowering the tubing string 1 with equipment, the mechanical packer 6 is unpacked, then the persistent packers 8 and 11. The tubing string 1 is suspended in the pipe head of the fountain armature (not shown) placed on the column head. A fountain tree of fountain fittings (not shown) is placed on the pipe head.

Next, using cable technology on the wire in combination with a lock, a cargo bar, a mechanical jar and a connector, lower the stopper plug to the landing nipple 5, install a stopper plug and lift the wire with a lock, rod and connector. After that, the circulation valve 7 is activated and the annulus is filled with an interpacker fluid of a certain density, which will be pumped between the packers 6 and 8. After the required volume of interpacker fluid is pumped, the circulation valve 7 is closed. Then, using the cable-cable technique, the plug-plug is removed from the landing nipple 5. The ESP 2 cable is connected to the control station and the well is put into operation.

Due to the fact that the check valve 12 was lowered into the set of downhole equipment on the tubing string 1, the extracted thermal waters do not rise to the earth's surface, but are pumped into the reservoir with hard to recover oil through the valves 10, thereby warming up the rock, which in turn reduces the rock viscosity of oil and significantly facilitates the movement of the latter to the bottom of production wells.

The inventive equipment for injection wells allows you to use the thermal properties of thermal waters located downstream of the geological section of the reservoir with hard-to-recover oil and pump them into a productive horizon in order to heat the rock and reduce the viscosity of oil, thereby eliminating the use of steam-thermal equipment installed on the earth’s surface, and also reduces excess energy costs.

Description of equipment for injection wells, which allows to simultaneously produce thermal water and pump them into a reservoir with hard-to-recover oil.

Pump-compressor pipes (tubing) 1 are used to extract liquid and gas from wells, inject water, compressed air (gas) and to carry out various types of work on the current and overhaul of wells. They are made of two types: with smooth ends and upset to the outside, on which an external thread is cut, and a coupling is screwed onto one end. At a distance of 0.4-0.6 m from the end of the pipes, from the side of the couplings, the mark - marking is knocked out.

The electric centrifugal pump 2 is a multi-stage and generally multi-section design. The module section of the pump consists of a housing, a shaft, a package of steps (impellers and guide vanes), upper and lower radial bearings, axial bearings, heads, bases. The package of steps with a shaft, radial bearings and axial support are placed in the housing and clamped by end parts. Pump designs differ in materials of working bodies, body parts, friction pairs, design and number of radial bearings.

Cable damage indicator 3 is intended for operational monitoring of the insulation state of high-voltage cables.

The valve for draining the fluid 4 is a device that serves to drain the fluid from the tubing string when lifting the ESP. It is a pipe sub not more than 30 cm long along the body with an internal thread at the top and an external thread at the bottom of the corresponding tubing thread. As a drain mechanism serves as a knock-down, usually brass, fitting protruding into the internal space of the device, having a cavity extending into the hole in the annulus of the well.

Landing nipple 5 is the main element of the assembly of the string for downhole operations, which is a coupling type pipe for installing, receiving and fixing downhole apparatus and devices in the string, lowered by wire or rope.

Mechanical packer 6 - mechanical packers should include packers, the sealing element of which is deformed due to the influence of the mass of the pipe string (for example, we can recommend the axial mechanical packer PM-R, working on the principle of “fountain pen”, that is, landing occurs by moving tubing strings up and then down (tubing rotation not required).

The circulation valve 7 is necessary for communicating the annulus with the tubing cavity.

Thrust packers 8 and 11 are installed by resting on the lower packer.

Landing nipple 9 is a pipe threaded tubing with an annular groove inside and a polished surface.

Well chambers 10 (mandrels with a side pocket) are special well chambers built into a production tubing string that is installed in an underground well to produce formation fluids such as oil or gas. In such mandrels, which in the literature are also called mandrels for removable equipment (valves), there are relatively short cylindrical chambers (side pockets) located parallel to the axis of the tubing string, but with an offset to the side from it. These lateral pockets through the openings communicate with the pipe (internal) space of the tubing string, and through the holes in the wall of the mandrel, with the annular space. Side pockets are mounting seats for fluid flow controllers (such as start or service valves) or instruments for measuring fluid and rock properties. If the mandrel is used to install valves, this provides the ability to control the flow of fluids from the passage channel of the tubing to the annular (annular) space or vice versa.

Check valve 12 is a device that allows the flow of water to move in only one direction.

The column disconnector 13 is intended for installation, disconnection, movable tight connection of the tubing string with packer-anchor equipment in the production casing, as well as for its extraction (for example, the universal casing disconnector can be recommended).

The compensator for temperature changes in the length of the tubing 14 allows you to maintain the reliability of the engagement of the packers with the production string and a high degree of sealing of the annular space between the tubing and the production string.

Claims (1)

Equipment for an injection well for the simultaneous production of thermal water and pumping it into a reservoir with hard-to-recover oil, including a tubing string — tubing, on which an electric centrifugal pump — an ESP with a cable — is lowered up and down, a cable damage indicator with depth sensors for measuring pressure and temperatures at the intake and discharge of the ESP, a valve for draining fluid from the tubing string when raising the ESP, a landing nipple for installing a plug, a mechanical action packer for installation at the roof thermal water boundary, circulation valve for communicating the annular space with the tubing cavity and injecting the interpacker fluid, a persistent packer with a hydraulic anchor for installation at the bottom of the oil reservoir, a landing nipple for the downhole fitting, well chambers with valves for injecting thermal water into the oil reservoir, a packer resistant for installation at the roof of the oil reservoir, a check valve to prevent the rise of thermal water to the earth's surface, a tubing string disconnector and a temperature compensator.

Images