CN-122014187-A - Deep well hypotonic reservoir thick oil thermal lift testing device and method

CN122014187ACN 122014187 ACN122014187 ACN 122014187ACN-122014187-A

Abstract

The invention discloses a deep well hypotonic reservoir thick oil hot lift testing device and a method. Comprises a surface device and a downhole tubular column; the surface device comprises a continuous oil pipe assembly, a wellhead flow head, a surface safety valve, a choke manifold, a three-phase separator, a multi-stage oil-water separation system, a heating power system, a metering tank connected with the multi-stage oil-water separation system and the three-phase separator, and a water source tank connected with the heating power system, which are sequentially connected, wherein the underground pipe column comprises a test pipe column, a packer arranged on the periphery of the test pipe column and a lifting valve arranged in the test pipe column. The invention has the beneficial effects that high Wen Dongli liquid can be continuously injected into the well, the well shaft is kept in a high-temperature state, the thickened oil coagulation pipe is prevented, the oil flow resistance is reduced, and the thickened oil testing efficiency is improved.

Inventors

HAN CHENG
MA LEI
WANG YINGHAO
LIU YU
XU JING
LI LONG

Assignees

中海石油(中国)有限公司湛江分公司

Dates

Publication Date: 20260512
Application Date: 20260313

Claims (6)

1. The utility model provides a deep well hypotonic reservoir viscous crude heat lifts testing arrangement, includes ground device and tubular column, its characterized in that in the pit: The ground device comprises a continuous oil pipe assembly, a wellhead flow head, a ground safety valve, a choke manifold, a three-phase separator, a multi-stage oil-water separation system, a heating power system, a metering tank connected with the multi-stage oil-water separation system and the three-phase separator, and a water source tank connected with the heating power system, wherein the heating power system is connected with the continuous oil pipe assembly through a total water flow pipe; The underground pipe column comprises a test pipe column, a packer arranged on the periphery of the test pipe column and a lifting valve arranged in the test pipe column, wherein the upper end of the test pipe column is connected with the lower end of the wellhead flow head and is set in a production casing through the packer, a continuous oil pipe of the continuous oil pipe assembly extends into the test pipe column and is connected with the lifting valve, and a second annulus is arranged between the continuous oil pipe and the test pipe column.
2. The deep well hypotonic reservoir thick oil thermal lift testing device of claim 1, wherein the lift valve comprises: the outer periphery of the lifting valve outer cylinder is connected with the inner periphery of the test pipe column, and an inwardly folded inserting part is arranged at the lower part of the inner periphery of the lifting valve outer cylinder; The lifting valve inner cylinder is connected with the continuous oil pipe at the upper end, a contraction section with gradually reduced inner diameter is arranged at the upper part of the lifting valve inner cylinder, a downward extending throat pipe is arranged at the inner periphery of the contraction section, a downward extending outer wall is arranged at the outer periphery of the contraction section, a nozzle is formed at the position with the minimum inner diameter of the contraction section, an inserting part matched with the inserting part is arranged at the lower part of the outer wall, a first annulus is formed between the upper part of the outer wall and the lifting valve outer cylinder, a first liquid inlet is arranged at the lower end of the throat pipe, an annular space is formed between the outer wall and the throat pipe, a first partition plate for dividing the annular space into an upper part and a lower part is arranged at the middle lower part of the annular space, and a second partition plate is arranged at the middle lower part of the throat pipe; The first liquid inlet is arranged on the side wall of the first partition plate and the lower part of the throat pipe, and the initial end of the first liquid inlet is positioned below the first partition plate; The third liquid inlet is radially arranged on the side wall of the upper end of the throat pipe; and the mixed liquid outlet is positioned above the second partition plate, sequentially passes through the throat pipe, the first partition plate and the outer wall in the radial direction, and is communicated with the first annular space.
3. The deep well hypotonic reservoir thick oil thermal lift testing device of claim 2, wherein a plurality of sealing ring grooves are formed in the periphery of the insertion portion, and sealing rings are arranged in the sealing ring grooves and used for achieving sealing fit between the insertion portion and the insertion portion.
4. The deep well hypotonic reservoir thick oil thermal lift testing device according to claim 1 is characterized in that a wellhead flow head is sequentially connected with a ground safety valve, a choke manifold and a three-phase separator through pipelines, the ground safety valve is an emergency shut-off control valve, the choke manifold is used for adjusting the flow rate of mixed liquid, the three-phase separator is used for primarily separating the mixed liquid, primarily separated natural gas is combusted or naturally dissipated through a combustion arm connected to an outboard, primarily separated oil enters a metering tank through a first oil flow pipe and a total oil flow pipe, primarily separated water enters the multistage oil-water separation system through a first water flow pipe, the multistage oil-water separation system is further separated, the further separated oil enters the metering tank through a second oil flow pipe and the total oil flow pipe, the further separated water enters the heating power system through the second water flow pipe, the heating power system is used for metering the inside and rapidly heating the flowing water to 60-70 ℃ and then serves as power liquid to be pumped at high pressure, the primarily separated natural gas enters a continuous oil pipe assembly through the total water flow pipe until the primary water flow pipe enters the metering tank through the first water flow pipe, the primarily separated oil flow pipe enters the multistage oil-water separation system, the multistage oil-water separation system is used for heating the water source drainage system, and the water source is used for heating.
5. A deep well hypotonic reservoir thick oil thermal lift test method, which adopts the deep well hypotonic reservoir thick oil thermal lift test device of claims 1-4, and comprises the following steps: S1, a lifting valve outer cylinder is put into a well along with a test pipe column, and is set in a production casing through the packer; s2, feeding a continuous oil pipe and an inner lifting valve cylinder, and sealing and matching with the outer lifting valve cylinder; S3, starting the heating power system, heating the power fluid to 60-70 ℃ by the heating power system, and continuously pumping the power fluid into the continuous oil pipe through pumping pressure of 15-25 MPa; s4, mixing the well fluid and the power fluid in a lifting valve to form mixed fluid, and enabling the mixed fluid to flow out through the wellhead flow head; S5, enabling mixed liquid from the wellhead flow head to sequentially pass through a ground safety valve, a choke manifold and enter a three-phase separator, performing primary separation in the three-phase separator, enabling the primarily separated natural gas to burn or naturally dissipate through a combustion arm connected to the outside of the wellhead, enabling the primarily separated oil to enter a metering tank, enabling the primarily separated water to enter the multistage oil-water separation system, performing further separation by the multistage oil-water separation system, enabling the further separated oil to enter the metering tank, enabling the further separated water to enter the heating power system, enabling the water quantity in the heating power system to be counted, enabling the water flowing through to be rapidly heated to 60-70 ℃, enabling the water to be discharged out of the high-pressure pump to serve as power liquid, and enabling the water flowing through the water pipe to enter a continuous oil pipe of the continuous oil pipe assembly; S6, after the pumping is stable, the volume increment of the oil and the water is respectively measured by the measuring tank and the heating power system within t hours and is respectively delta V Oil (oil) and delta V Water and its preparation method , Further, the daily output of the crude oil tested by the oil well is calculated as follows: further, the daily output of raw water for oil well test is calculated as follows: 。
6. The deep well hypotonic reservoir thick oil thermal lifting test method of claim 5, wherein the temperature of the mixed liquid which is pumped and stabilized to return reaches 50-60 ℃, and the mixed liquid sees crude oil.

Description

Deep well hypotonic reservoir thick oil thermal lift testing device and method Technical Field The invention relates to the technical field of oil well testing operation, in particular to a deep well hypotonic reservoir thick oil thermal lifting testing device and method. Background The current oil and gas resource exploration gradually goes to deep ultra-deep layers, and low-yield low-grade oil reservoirs such as low-permeability oil reservoirs and heavy oil reservoirs become the main field of exploration reserve discovery. The oil reservoirs are buried deeply, the reservoirs have the characteristics of low pore and low permeability, the starting pressure of the oil flow is high, the viscosity of the thickened oil is high, the starting pressure of the oil flow is further improved, and the testing yield is difficult to accurately obtain. At present, the oil well test is generally carried out by injecting nitrogen into a continuous oil pipe, but the nitrogen injection is easy to cool a shaft, so that the oil well test cannot be suitable for heavy oil reservoir test operation and cannot acquire accurate yield data, the screw pump test can be carried out by feeding a heating cable into a certain depth to heat the shaft, but the feeding depth of the screw pump is limited, and larger production pressure difference cannot be caused in the test process, so that the accurate evaluation of the oil reservoir is influenced, and the oil well test device is not suitable for deep well low-permeability oil reservoir test operation. Aiming at deep hypotonic and heavy oil reservoirs, a proper test method is needed, yield data are accurately obtained, and exploration and development of the reservoirs are guided. Disclosure of Invention The invention aims to provide a deep well low permeability reservoir thick oil thermal lift testing device which can continuously inject high Wen Dongli liquid into a well, keep a well shaft in a high-temperature state, prevent thick oil from condensing pipes, reduce oil flow resistance and improve thick oil testing efficiency. The invention also aims to provide a deep well hypotonic reservoir thick oil thermal lifting test method which can continuously inject high Wen Dongli liquid into a well, keep a well shaft in a high-temperature state, prevent thick oil from condensing, reduce oil flow resistance and improve thick oil test efficiency. In order to achieve the purpose, the invention adopts the following technical scheme that the device comprises a ground device and a downhole tubular column; The ground device comprises a continuous oil pipe assembly, a wellhead flow head, a ground safety valve, a choke manifold, a three-phase separator, a multi-stage oil-water separation system, a heating power system, a metering tank connected with the multi-stage oil-water separation system and the three-phase separator, and a water source tank connected with the heating power system, wherein the heating power system is connected with the continuous oil pipe assembly through a total water flow pipe; The underground pipe column comprises a test pipe column, a packer arranged on the periphery of the test pipe column and a lifting valve arranged in the test pipe column, wherein the upper end of the test pipe column is connected with the lower end of the wellhead flow head and is set in a production casing through the packer, a continuous oil pipe of the continuous oil pipe assembly extends into the test pipe column and is connected with the lifting valve, and a second annulus is arranged between the continuous oil pipe and the test pipe column. Preferably, the lifting valve comprises: the outer periphery of the lifting valve outer cylinder is connected with the inner periphery of the test pipe column, and an inwardly folded inserting part is arranged at the lower part of the inner periphery of the lifting valve outer cylinder; The lifting valve inner cylinder is connected with the continuous oil pipe at the upper end, a contraction section with gradually reduced inner diameter is arranged at the upper part of the lifting valve inner cylinder, a downward extending throat pipe is arranged at the inner periphery of the contraction section, a downward extending outer wall is arranged at the outer periphery of the contraction section, a nozzle is formed at the position with the minimum inner diameter of the contraction section, an inserting part matched with the inserting part is arranged at the lower part of the outer wall, a first annulus is formed between the upper part of the outer wall and the lifting valve outer cylinder, a first liquid inlet is arranged at the lower end of the throat pipe, an annular space is formed between the outer wall and the throat pipe, a first partition plate for dividing the annular space into an upper part and a lower part is arranged at the middle lower part of the annular space, and a second partition plate is arranged at the middle lower part of the throat pipe; The first liqu