Infinite stratified oil testing and production testing method for testing directional well in dragging mode through nonmetal coiled tubing

Abstract

The invention belongs to the field of oil field oil extraction technology, oil reservoir monitoring and oil testing and production testing, and discloses an infinite layering oil testing and production testing method for testing a directional well in a dragging mode through a non-metal coiled tubing, and the method comprises the steps that a tool string and a non-metal tubing are put into the well to the designed position through a wellhead sealing and fixing device; the wellhead sealing and fixing device locks and seals the wellhead; after various parameters of the underground oil reservoir are collected and recorded, the electro-hydraulic sealer is reused for setting, and the lower layer of the oil reservoir is plugged; after combined parameters of a reuse electro-hydraulic sealer and an oil testing and production testing oil-submerged pump production pipe column are set, an oil-submerged motor is started for production, flow pressure is controlled to a designed set point, and oil, water and gas yields and related oil reservoir data are recorded through an incoming liquid separation treatment metering device; and according to the flow pressure control set point, the combined working parameters of the reuse electro-hydraulic sealer and the oil testing and production testing oil-submerged pump production pipe column are adjusted. The technical method is wide in application range, high in safety and high in implementation reliability, and plays an important role and significance in the aspect of propelling directional well infinite layering oil testing and production testing.

Description

Technical Field

[0001] This invention relates to the fields of oilfield production technology, reservoir monitoring, and oil testing and production, specifically to a method for testing directional wells in an infinitely layered manner using a non-metallic coiled tubing drag-type method. This process can realize the layered occurrence of directional wells, providing effective technical support for fine-grained layered oil production and water injection, and precise layered potential tapping, thereby comprehensively improving the utilization of reservoirs and increasing oil well recovery rate and water drive efficiency. Background Technology

[0002] Oilfield development is a meticulous and systematic professional technology. Each oilfield has numerous oil-bearing strata, with significant differences in physical properties, large inter-stratum pressure differentials, varying viscosities and water content of the produced fluids, and different reservoir formation material conditions. Therefore, understanding the strata through process technology is crucial, as it determines the overall development and utilization level of each stratum, the reservoir development method, the process technology scheme, production parameter characteristics, and the final oilfield recovery rate. Current technologies cannot meet the multi-tasking requirements with a single process tubing run. Process implementation requires the use of workover rigs for re-construction, shorting the tubing, connecting cables, resetting, and other cumbersome procedures. This results in extremely low operational efficiency, low success rates, a large number of personnel required, a heavy workload, and long well occupation times, impacting single-well production. This severely restricts the development of strata understanding, reservoir monitoring, and refined oilfield development. Summary of the Invention

[0003] This invention effectively solves the above-mentioned problems. In a method for testing and producing oil in directional wells with non-metallic coiled tubing, a novel method is achieved by using a continuous non-metallic hose in conjunction with a related tool string to obtain high-pressure physical property data of crude oil in each layer, test the production profile, determine the reasonable production flow pressure, and evaluate the reservoir.

[0004] The technical solution of the present invention is as follows:

[0005] A non-metallic coiled tubing-driven directional well infinite stratification oil testing and production system includes a crane, gooseneck head, upper clamp, lower clamp, blowout preventer, non-metallic tubing and drum, hydraulic station, and operating platform. The hydraulic station is equipped with a central control system. The structure of the hydraulic station is as follows: the incoming fluid separation and metering device is connected to the non-metallic tubing and drum through the outgoing oil pipeline; the tubing is supported into the well by a guide support; the well string is a combination of a reusable electro-hydraulic seal and a production tubing string for oil testing and production submersible pumps; and a wellhead sealing and fixing device is installed at the wellhead.

[0006] Furthermore, the reusable electro-hydraulic seal and the production tubing assembly for oil testing and production testing consists of a reusable electro-hydraulic seal, a submersible pump, a gas distribution device, a protector, a submersible unit, and a pilot shoe connected in sequence.

[0007] Furthermore, the reusable electro-hydraulic seal consists of a reusable rubber sleeve, a cable plug, and an electro-hydraulic actuator.

[0008] Furthermore, the wellhead sealing and fixing device consists of a blowout preventer, a sealing module, and a release sleeve.

[0009] Furthermore, non-metallic oil pipes and rollers are structures that utilize winding machines, rollers, meter counters, and process flow metal joints.

[0010] Furthermore, the liquid separation and metering device includes a sand remover, a primary and secondary oil separator, and a metering pump.

[0011] Furthermore, the guide support consists of a truss and a rolling device.

[0012] Furthermore, the upper and lower grippers are controlled by a central control system, enabling them to move up and down via a crane.

[0013] Furthermore, the central control system includes the central control system console and the central control system signal harness.

[0014] A method for testing and producing oil indefinitely in directional wells using a non-metallic coiled tubing drag system includes the following steps:

[0015] ① The tool string and non-metallic tubing are lowered into the well to the designed position through the wellhead sealing and fixing device; the central control system sends a command to the wellhead sealing and fixing device, which locks and seals the wellhead; after collecting and recording various parameters of the downhole reservoir, the central control system sends a command to reuse the electro-hydraulic sealer to set the seal and seal the lower layer of the reservoir.

[0016] ② Collect and record various reservoir parameters, set the combined parameters of the reusable electro-hydraulic seal and the production tubing of the test oil and production submersible pump, start the submersible motor to produce, control the flow pressure to the design set point, and record the production of oil, water, gas and related reservoir data through the liquid separation and metering device.

[0017] ③According to the oil testing and production design, adjust the working parameters of the combined working parameters of the reusable electro-hydraulic seal and the production tubing of the oil testing and production submersible pump based on the flow pressure control setpoint;

[0018] ④ After all the tests in the lower layer are completed, the central control system sends a command to release the electro-hydraulic seal; the central control system sends a command to the wellhead sealing and fixing device, and the wellhead sealing and fixing device is unlocked; the non-metallic tubing string is dragged to the upper designed reservoir for oil testing and production by using the gooseneck head, upper clamp, lower clamp and ground roller on the crane.

[0019] ⑤ Repeat steps ① to ④ to achieve the infinite stratification oil testing and production process.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] Applying this method to oil testing and production operations allows for continuous operation without repeated well control or separate short-start and cable connection procedures. It increases operational efficiency by more than five times per well and saves 80,000 yuan per well in oil testing and production costs. This method is highly automated, requires fewer on-site personnel, and effectively reduces safety risks for personnel at the construction site. This technology has a wide range of applications, high safety, and strong reliability, and plays a significant role in advancing directional well testing and production across unlimited strata. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a diagram showing the tubing string being dragged after the initial well entry and single-layer oil testing and production.

[0024] Figure 2 This is a normal oil trial and production diagram;

[0025] Figure 3 This is a schematic diagram of the wellhead sealing and fixing device structure;

[0026] Figure 4 This is a schematic diagram of the combined structure of the downhole reusable electro-hydraulic seal and the submersible pump unit for oil testing and production.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Crane, 2. Gooseneck head, 3. Upper clamp, 4. Lower clamp, 5. Blowout preventer, 6. Non-metallic tubing and rollers, 7. Hydraulic station, 8. Control panel, 9. Control console of central control system, 10. Incoming fluid separation and metering device, 11. Guide support, 12. Wellhead sealing and fixing device, 13. Reusable electro-hydraulic seal and production tubing assembly for oil testing and production submersible pump, 14. Signal harness of central control system, 15. Oil outlet pipeline, 16. Release sleeve, 17. Sealing module, 18. Reusable electro-hydraulic seal, 19. Submersible pump, 20. Gas separator, 21. Protector, 22. Submersible motor, 23. Guide shoe. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0030] Example 1

[0031] The present invention discloses a non-metallic coiled tubing-driven directional well infinite stratification testing and production system, comprising non-metallic tubing and rollers 6, guide supports 11, gooseneck heads 2, upper and lower clamps, wellhead sealing and fixing devices 12, reusable electro-hydraulic seals and a submersible pump production tubing assembly 13, a crane 1, an incoming fluid separation and metering device 10, and a central control system. This system, while reducing workload, saving significant manpower, and comprehensively improving testing and production efficiency, ultimately enhances the efficiency of reservoir monitoring, production profile testing, high-pressure reservoir property data acquisition, and reservoir evaluation methods.

[0032] The non-metallic tubing and drum 6 are structures consisting of a winding machine, drum, meter counter and process flow metal joint. This device can realize the winding and release of non-metallic continuous tubing, which facilitates the dragging of non-metallic continuous tubing to the predetermined position in the well during the process.

[0033] The guide support 11 consists of a truss and a rolling device, which is used to support the non-metallic tubing from the roller to the wellhead section, so that the non-metallic tubing can be dragged up and down in the well through the gooseneck head.

[0034] The upper clamp 3 and lower clamp 4 are controlled by the central control system through the hydraulic system, which enables them to move up and down via the crane 1, dragging the non-metallic pipe in the well for positioning and retraction according to process requirements.

[0035] The wellhead sealing and fixing device 12 consists of a blowout preventer 5, a sealing module 17, and a release sleeve 16. It is used to seal the wellhead to prevent gas and liquid from directly overflowing when the non-metallic tubing moves up and down in the well. When the entire device is lowered to the target position, the release sleeve locks, forming an effective seal between the wellhead and the non-metallic tubing. Then, production, control, evaluation and other process operations can be carried out directly on the well.

[0036] The reusable electro-hydraulic seal and the production tubing assembly 13 for oil testing and production testing submersible pumps consists of a submersible pump 19, a gas distribution device 20, a protector 21, a submersible motor 22, a pressure sensor, a temperature sensor, a vibration sensor, a tensile load sensor, and a guide shoe 23. It is used to lift downhole crude oil to the surface separation and processing metering device. The sensors acquire various reservoir physical parameters, submersible unit parameters, and non-metallic pipe tensile load conditions and transmit the relevant data back to the central control system.

[0037] The reusable electro-hydraulic sealer 18 consists of a reusable rubber sleeve, a cable plug, and an electro-hydraulic actuator controller. It is used to seal and isolate various layers in the well, facilitating the execution of single-layer or multi-layer production, control, and evaluation processes.

[0038] The influent separation and metering device 10 comprises a desander, primary and secondary oil separators, and metering pumps, among other process components. It processes the produced fluid from the well, performing three-phase separation of oil, water, and gas, and metering the data. The metering data is transmitted back to the central controller for comprehensive analysis. The central control system consists of a dedicated control console, a main control computer, interface cards, data acquisition cards, a main control program, a hydraulic coordination control subroutine, a drum and wellhead sealing device coordination subroutine, and an emergency stop control program. It is used for data acquisition, control, coordination, process implementation, and data analysis.

[0039] During the oil testing and production trial, after the wellhead sealing and fixing device 12 is installed, and the non-metallic tubing, roller 6, and guide support 11 are in place, the metal joint pipeline at the rear end of the non-metallic tubing and roller 6 is connected to the liquid separation and metering device 10. The relevant cable harnesses are connected to the control console 9 of the central control system. The non-metallic tubing is then passed through the gooseneck 2, upper clamp 3, and lower clamp 4. First, a crane 1 is used to lower the reusable electro-hydraulic seal and the production tubing assembly 13 of the submersible pump for oil testing and production into the well, and it is suspended using a lifting clamp. Then, the crane 1 is used to lift the gooseneck 2, upper clamp 3, and lower clamp 4, and the suspension of the gooseneck 2, upper clamp 3, and lower clamp 4 is adjusted to be directly above the wellhead. The non-metallic tubing is then lowered above the wellhead through the central control system, connected to the upper joint of the reusable electro-hydraulic seal 18, and the cables and signal lines are connected. The following operations are then performed:

[0040] ① The tool string and non-metallic tubing are lowered into the well to the designed position through the wellhead sealing and fixing device 12; the central control system sends a command to the wellhead sealing and fixing device 12, and the wellhead sealing and fixing device 12 locks and seals the wellhead; after collecting and recording various parameters of the downhole reservoir, the central control system sends a command to reuse the electro-hydraulic sealer 18 to seal the lower layer of the reservoir.

[0041] ② Collect and record various reservoir parameters, set the parameters of the reusable electro-hydraulic seal and the production tubing combination 13 of the test oil and production submersible pump, start the submersible motor 22 to produce, control the flow pressure to the design set point, and record the oil, water and gas production and related reservoir data through the liquid separation and metering device 10.

[0042] ③According to the oil testing and production design, adjust the working parameters of the reusable electro-hydraulic seal and the production tubing assembly 13 of the oil testing and production submersible pump based on the flow pressure control setpoint;

[0043] ④ After all the tests in the lower layer are completed, the central control system sends a command to release the electro-hydraulic sealer 18; the central control system sends a command to the wellhead sealing and fixing device 12, and the wellhead sealing and fixing device 12 is unlocked; the non-metallic tubing string is dragged to the upper designed reservoir for oil testing and production by using the gooseneck head 2, upper clamp 3, lower clamp 4 and ground roller on the crane 1.

[0044] ⑤ Repeat steps ① to ④ to achieve the infinite stratification oil testing and production process.

[0045] The terms "comprising," "including," or any other variations thereof used in this specification are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. It should be noted that, without conflict, embodiments and features in the embodiments of this invention can be combined with each other. This invention is not limited to any single aspect, nor to any single embodiment, nor to any combination and / or substitution of these aspects and / or embodiments. Moreover, each aspect and / or embodiment of the invention can be used alone or in combination with one or more other aspects and / or embodiments thereof.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A system for testing and production of directional well by using non-metallic coiled tubing drag-type testing and unlimited layering, comprising a crane (1), a gooseneck head (2), an upper clamp (3), a lower clamp (4), a blowout preventer (5), a non-metallic tubing and a reel (6), a hydraulic station (7), an operating platform (8), characterized in that, The hydraulic station (7) is provided with a central control system, and the structure of the hydraulic station (7) is as follows: the liquid separation treatment metering device (10) is connected with the non-metal oil pipe and the drum (6) through the oil outlet pipeline (15), the oil pipe is supported into the well through the guide support (11), the pipe column in the well is the combination (13) of the reusable electro-hydraulic sealer and the production pipe column of the oil testing and production submersible pump, and the wellhead is provided with the wellhead sealing fixing device (12).

2. The system according to claim 1, wherein the system is characterized in that, The combination (13) of the reusable electro-hydraulic sealer and the production pipe column of the oil testing and production submersible pump is sequentially connected by the reusable electro-hydraulic sealer (18), the submersible pump (19), the gas separation device (20), the protector (21), the submersible unit (22) and the guide shoe (23).

3. The system according to claim 2, wherein the system is characterized in that, The reusable electro-hydraulic sealer (18) is composed of a reusable rubber cylinder, a cable plug and an electro-hydraulic execution controller.

4. The system according to claim 1, wherein the system is characterized in that, The wellhead sealing fixing device (12) is composed of the blowout preventer (5), the sealing module (17) and the release pressure sleeve (16).

5. The non-metal coiled tubing drag-type test directional well unlimited separate layer test production system according to claim 1, characterized in that the non-metal The oil pipe and the drum (6) are of a structure with a winding machine, a drum, a meter and a process flow metal joint.

6. The non-metal coiled tubing drag-type test multi-zone testing and production system for directional wells of claim 1, wherein, The liquid separation treatment metering device (10) comprises a desander, a two-stage oil separation device and a metering pump.

7. The system according to claim 1, wherein the system is characterized in that, The guide support (11) is composed of a truss and a rolling device.

8. The system according to claim 1, wherein the system is characterized in that, The upper holder (3) and the lower holder (4) are controlled by the central control system to realize the suspension and the up-and-down movement thereof through the crane (1).

9. The non-metal coiled tubing drag-type test multi-zone testing and production system for directional wells according to claim 1, characterized in that, The central control system comprises a console (9) of the central control system and a signal harness (14) of the central control system.

10. A method for testing and producing a directional well by using a non-metallic coiled tubing drag-type test infinite layer testing and production method, characterized in that, The steps include: ①The tool string and the non-metal oil pipe are lowered into the well to the designed position through the wellhead sealing fixing device (12); the central control system sends a command to the wellhead sealing fixing device (12), the wellhead sealing fixing device (12) is locked to seal the wellhead; after collecting and recording various parameters of the downhole reservoir, the central control system sends a command, the reusable electro-hydraulic sealer (18) is sealed to block the lower layer of the reservoir; ②After collecting and recording various parameters of the reservoir and setting the parameters of the combination (13) of the reusable electro-hydraulic sealer and the production pipe column of the oil testing and production submersible pump, the submersible motor (22) is started to produce, the flow pressure is controlled to the designed set point, and the oil, water and gas production and related reservoir data are recorded through the liquid separation treatment metering device (10); ③According to the oil testing and production design, the working parameters of the combination (13) of the reusable electro-hydraulic sealer and the production pipe column of the oil testing and production submersible pump are adjusted according to the flow pressure control set point; ④After all the lower layers are tested, the central control system sends a command to unseal the reusable electro-hydraulic sealer (18); the central control system sends a command to the wellhead sealing fixing device (12), the wellhead sealing fixing device (12) is unlocked; the non-metal oil pipe column is dragged to the upper layer of the designed reservoir for oil testing and production through the crane (1), the gooseneck head (2), the upper holder (3), the lower holder (4) and the ground drum; ⑤The steps of ① to ④ are repeated to realize the infinite layered oil testing and production process method.

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