Downhole operation liquid level monitoring and hydraulic well filling system

Abstract

The utility model belongs to the technical field of oil and gas field development, and discloses a downhole operation liquid level monitoring and hydraulic well filling system, which comprises a shaft dynamic liquid level detection unit, a shaft liquid level monitoring device, a pressure guide pipe and a plugging plug, the plug connector is mounted at an outlet of the kill manifold, and the needle valve is mounted between the outlet of the kill manifold and a first outlet of the kill manifold tee joint; the grouting hydraulic well unit comprises a grouting pump control system, a grouting pump, a liquid storage tank body, a wireless liquid level sensor, a liquid outlet manifold, a grouting manifold, an electromagnetic flowmeter and an electromagnetic valve; the upper computer is in communication connection with the shaft liquid level monitoring device, the wireless liquid level sensor, the liquid filling pump control system, the electromagnetic flowmeter and the electromagnetic valve. According to the utility model, the situations that grouting is not timely and not full can be effectively reduced, and the pressure and the liquid level in a shaft in the tripping process are controlled to keep a dynamic balance state. The utility model is suitable for the construction operation of the accurate hydraulic filling well of the return loss well represented by the old well of the reservoir deficit and the injection-production well of the gas storage.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil and gas field development, in particular to a downhole operation liquid level monitoring and hydraulic well filling system. Background Art

[0002] With the vigorous development of oil fields and the construction of gas storage facilities, the problems of lost-return wells represented by old wells with reservoir depletion and injection and production wells of gas storage facilities, as well as the complex wellbore problems of lost-return wells caused by various reasons are becoming increasingly serious. Due to the low formation pressure coefficient and serious leakage in conventional well killing, a large amount of clean water must be injected into the well during well control work to ensure the safety of construction. Failure to inject water with reasonable well killing fluid and in a reasonable manner will cause a large amount of clean water to enter the formation and cause pollution problems. In addition, this treatment method is not easy to resume production after the operation, and it is difficult to resume production smoothly.

[0003] In order to maintain the pressure balance in the well and ensure the smooth progress of the operation, the oil field operation site is equipped with a simple filling device. The device adopts a manual control method for filling, and lacks leakage evaluation and precise filling pressure control technical means linked with the liquid level monitoring device. Due to the lack of effective liquid level monitoring and targeted filling means, it is impossible to carry out in-process and post-event supervision, and leakage and overflow conversion are prone to occur, which may also cause toxic and harmful gases to overflow the wellhead, posing risks to personnel and equipment. It is impossible to ensure the safe and efficient implementation of downhole operations and cannot effectively prevent blowouts or well control outages. Utility Model Content

[0004] In order to solve the above-mentioned deficiencies in the prior art, the utility model aims to provide a downhole operation liquid level monitoring and hydraulic well grouting system, so as to effectively reduce the occurrence of untimely and incomplete grouting, and control the pressure and liquid level in the wellbore to maintain a dynamic balance during the drilling process.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: A downhole operation fluid level monitoring and hydraulic well filling system, comprising:

[0006] The wellbore dynamic liquid level detection unit includes a wellbore liquid level monitoring device, a pressure lead pipe, and a plug; the plug connector is installed at the outlet of the wellbore kill manifold, and the needle valve is installed between the outlet of the wellbore kill manifold and the first outlet of the tee of the wellbore kill manifold;

[0007] The grouting hydraulic well unit includes a grouting pump control system, a grouting pump, a liquid storage tank, a wireless liquid level sensor, a liquid outlet manifold, a grouting manifold, an electromagnetic flowmeter, and a solenoid valve. The grouting pump is connected to the grouting pump control system, a wireless liquid level sensor is installed on the liquid storage tank, the liquid storage tank is connected to the liquid outlet manifold, the grouting pump is connected to the liquid outlet manifold and the grouting manifold respectively, and the grouting manifold is connected in series with the electromagnetic flowmeter and the solenoid valve and then connected to the second outlet of the tee of the well-killing manifold.

[0008] The upper computer is respectively connected to the wellbore liquid level monitoring device, the wireless liquid level sensor, the filling pump control system, the electromagnetic flow meter and the electromagnetic valve for communication.

[0009] As a limitation of the present invention, the communication connection is a LoRa wireless communication connection.

[0010] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0011] The utility model is suitable for the precise grouting hydraulic well construction operation of lost return wells represented by old wells with reservoir deficit and injection and production wells of gas storage reservoirs. It can effectively reduce the occurrence of untimely grouting and insufficient grouting, and is conducive to controlling the pressure and liquid level in the wellbore during the drilling process to maintain a dynamic balance, thereby improving the level of well control safety management. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0013] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0014] Figure 2 This is a structural schematic diagram of a wellbore dynamic liquid level detection unit according to an embodiment of the present utility model;

[0015] Figure 3 This is a schematic structural diagram of a hydraulic well unit according to an embodiment of the present invention.

[0016] In the figure: I, wellbore dynamic liquid level detection unit; I-1, wellbore liquid level monitoring device; I-2, pressure lead pipe; I-3, plug; I-4, well kill manifold outlet; I-5, needle valve;

[0017] II. Grouting well unit; II-1-1. Liquid storage tank; II-1-2. Wireless liquid level sensor; II-1-3. Liquid outlet manifold; II-2-1. Grouting pump control system; II-2-2. Control line; II-2-3. Grouting pump; II-2-4. Grouting manifold; II-3-1. Electromagnetic flowmeter; II-3-2. Solenoid valve;

[0018] III. Host computer;

[0019] 1. Kill well manifold tee; 2. Kill well manifold. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and understand the present invention and are not intended to limit the present invention.

[0021] Example: A downhole operation fluid level monitoring and hydraulic well filling system

[0022] like Figures 1 to 3 As shown, this embodiment includes a wellbore dynamic liquid level detection unit I, a well filling unit II and a host computer III.

[0023] The wellbore dynamic liquid level detection unit I comprises a wellbore liquid level monitoring device I-1, a pressure-inducing pipe I-2, and a plug connector I-3, which are connected in sequence. The wellbore liquid level monitoring device I-1 uses the release of high-pressure gas from a nitrogen cylinder as a sound source to generate sound and infrasound to detect the liquid level depth. The wellbore liquid level monitoring device I-1 is communicatively connected to a host computer III. One end of the pressure-inducing pipe I-2 is fixedly connected to the open end of the wellbore liquid level detection device, and the other end is fixedly connected to the male plug of the plug connector. The plug connector is a quick-connect plug I-3, comprising a male plug and a female plug that are connected. The plug connector can adopt the structure of an aviation plug. The female plug of the plug connector is fixedly connected to the wellbore pressure manifold outlet I-4. The plug connector allows the wellbore liquid level monitoring device I-1 to be quickly connected to the wellbore pressure manifold 2 to be detected, ensuring effective plug-in sealing. A kill manifold tee 1 is installed in the middle of the kill manifold 2. This divides the manifold 2 into two sections. The first outlet of the tee 1 connects to one section of the kill manifold 2, with outlet I-4 located on this section. The second outlet of the tee 1 connects to the hydraulic well unit II, and the third outlet of the tee 1 connects to the other section of the kill manifold 2. A needle valve I-5 is installed on the kill manifold 2 between outlet I-4 and the first outlet of the tee 1. This valve opens and closes the manifold section I-4 to prevent excessive backflow pressure from the wellbore annulus and reduce potential accidents. When assembling the dynamic wellbore liquid level detection unit I, close needle valve I-5, connect the threaded female plug base to the male thread of the wellbore manifold outlet I-4, seal the wellbore manifold tee 1, and connect one end of the wellbore manifold outlet I-4. Then, connect the wellbore liquid level monitoring device I-1, the pressure-inducing pipe I-2, the male plug, and the female plug, completing the connection between the dynamic wellbore liquid level detection unit I and the wellbore manifold 2. During operation, when the high-pressure gas in the nitrogen cylinder of the wellbore liquid level monitoring device I-1 is released and sounds, needle valve I-5 opens, transmitting infrasound waves through the pressure-inducing pipe I-2 into the inner cavity of the wellhead casing annulus. When the infrasound waves contact the dynamic liquid surface in the wellbore casing annulus, they are reflected back through the pressure-inducing pipe I-2 and return to the wellbore liquid level monitoring device I-1. The relevant signals converted by the wellbore liquid level monitoring device I-1 are then transmitted to the host computer III via LoRa wireless transmission technology.

[0024] Grouting well unit II includes a grouting pump control system II-2-1, a grouting pump II-2-3, a liquid storage tank II-1-1, a wireless liquid level sensor II-1-2, a liquid outlet manifold II-1-3, a grouting manifold II-2-4, an electromagnetic flowmeter II-3-1, and a solenoid valve II-3-2. Grouting pump II-2-3 is connected to and controlled by the grouting pump control system II-2-1. In this embodiment, the grouting pump control system II-2-1 is connected to the grouting pump II-2-3 via a control line II-2-2. The grouting pump control system II-2-1 controls the speed and displacement of the grouting pump II-2-3. Liquid storage tank II-1-1 is equipped with a wireless liquid level sensor II-1-2. Liquid storage tank II-1-1 is connected to a liquid outlet manifold II-1-3. A grouting pump II-2-3 is connected to both the liquid outlet manifold II-1-3 and the grouting manifold II-2-4, respectively. This allows the well-killing fluid in liquid storage tank II-1-1 to flow through the liquid outlet manifold II-1-3 and out to the grouting manifold II-2-4 under the action of the grouting pump II-2-3. The grouting manifold II-2-4 is connected in series with an electromagnetic flowmeter II-3-1 and a solenoid valve II-3-2, and then to the second outlet of the well-killing manifold tee 1. The wireless liquid level sensor II-1-2, grouting pump control system, electromagnetic flowmeter II-3-1 and solenoid valve II-3-2 are all connected to the host computer III. Through LoRa wireless transmission network technology, the host computer III can monitor and obtain the relevant parameters of the wireless liquid level sensor II-1-2, grouting pump control system II-2-1, electromagnetic flowmeter II-3-1 and solenoid valve II-3-2 in real time, and adjust the relevant control instructions in time according to the needs of wellbore operations, so as to realize the opening and closing of the grouting hydraulic well device and the adjustment of the displacement of the grouting hydraulic well. During the hydraulic well operation, the grouting pump II-2-3 extracts the well-killing fluid from the liquid storage tank II-1-1, and allows the well-killing fluid to pass through the liquid outlet manifold II-1-3, the grouting manifold II-2-4, the electromagnetic flowmeter II-3-1, and the solenoid valve II-3-2 to enter the second outlet of the well-killing manifold tee 1 to implement the well-killing operation. The electromagnetic flowmeter II-3-1 collects real-time data such as the well-killing fluid displacement and the total amount of fluid entering the well, and sends them to the host computer III via the LoRa wireless transmission network. At the same time, the liquid level change data of the liquid storage tank II-1-1 measured by the wireless liquid level sensor II-1-2 is also sent to the host computer III via the LoRa wireless transmission network. The host computer III performs intelligent analysis and comparison on the relevant data, corrects the grouting well displacement parameters in real time, and sends them to the grouting pump control system II-2-1 via the LoRa wireless transmission network for regulation.

[0025] When using this embodiment, the needle valve I-5 is opened, and the wellbore dynamic liquid level detection unit I feeds back the wellbore annular space liquid level and pressure information detected by the wellbore liquid level monitoring device I-1 to the host computer III through the LoRa wireless transmission network in a timely manner. The host computer III relies on the built-in monitoring and control software system to intelligently analyze the wellbore liquid level and pressure information obtained remotely, and calculates the optimal well-killing construction fluid volume and pump displacement. The feedback is fed back to the grouting pump control system II-2-1 through the LoRa wireless transmission network and the relevant grouting pump speed and displacement instructions are issued. The grouting pump II-2-3 starts and implements the grouting well according to the grouting displacement issued by the host computer III, and the liquid in the liquid storage tank body II-1-1 is filled. As the killing fluid is pumped out, electromagnetic flowmeter II-3-1 collects real-time data on the killing fluid discharge rate and total fluid volume injected into the well, transmitting it to host computer III via the LoRa wireless transmission network. Simultaneously, wireless level sensor II-1-2 measures the liquid level change data in tank II-1-1, also transmitting it to host computer III via the LoRa wireless transmission network. The host computer III software system intelligently analyzes and compares the data collected from wireless level sensor II-1-2 and electromagnetic flowmeter II-3-1, performing real-time corrections to the wellbore discharge rate parameters and the grouting pump speed. This system then adjusts the killing fluid volume in real time, transmitting the data to grouting pump control system II-2-1 via the LoRa wireless transmission network for control. After the wellbore is completed, host computer III issues a command, which is transmitted via the LoRa wireless network to grouting pump control system II-2-1 and wireless level sensor II-1-2, causing grouting pump II-2-3 and wireless level sensor II-1-2 to stop and await further instructions. In addition, the upper computer III can also set the liquid level and filling volume warning range according to construction needs. When the warning range is exceeded, the monitoring terminal will perform sound and light warnings to improve the safety of the well repair operation.

[0026] It should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art may still modify the technical solutions described in the above embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A downhole operation liquid level monitoring and hydraulic well filling system, characterized in that include: The wellbore dynamic liquid level detection unit includes a wellbore liquid level monitoring device, a pressure lead pipe, and a plug; the plug connector is installed at the outlet of the wellbore kill manifold, and the needle valve is installed between the outlet of the wellbore kill manifold and the first outlet of the tee of the wellbore kill manifold; The grouting hydraulic well unit includes a grouting pump control system, a grouting pump, a liquid storage tank, a wireless liquid level sensor, a liquid outlet manifold, a grouting manifold, an electromagnetic flowmeter, and a solenoid valve. The grouting pump is connected to the grouting pump control system, a wireless liquid level sensor is installed on the liquid storage tank, the liquid storage tank is connected to the liquid outlet manifold, the grouting pump is connected to the liquid outlet manifold and the grouting manifold respectively, and the grouting manifold is connected in series with the electromagnetic flowmeter and the solenoid valve and then connected to the second outlet of the tee of the well-killing manifold. The upper computer is respectively connected to the wellbore liquid level monitoring device, the wireless liquid level sensor, the filling pump control system, the electromagnetic flow meter and the electromagnetic valve for communication.

2. The downhole operation fluid level monitoring and hydraulic well filling system according to claim 1, characterized in that: The communication connection is a LoRa wireless communication connection.

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