Gas testing system suitable for cluster well group

Abstract

The utility model relates to a gas testing system suitable for a cluster well group, and belongs to the technical field of well drilling gas testing operation. According to the utility model, one manifold is configured for each wellhead, and each wellhead is connected to the metering pipeline through the respective manifold, so that each wellhead is connected to the same metering pipeline through the corresponding manifold and valve, the number of the manifolds is saved, the number of the metering pipelines is also saved, and the metering pipeline does not need to be independently configured for each wellhead; material and equipment investment and occupied area are reduced; in order to meet the simultaneous test of different flows, at least two metering pipelines are provided, and the simultaneous test of different flows is realized through the switching of the manifold and the valve, so that the test efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to a gas testing system suitable for a cluster well group, belonging to the technical field of drilling gas testing operations. Background Art

[0002] Gas testing is a complete set of processes that involves perforating, fracturing, induced blowout, and other methods to allow fluids (gas, water, condensate, etc.) in the formation to enter the wellbore and flow out of the ground, and then obtain gas formation data through ground control. The ground process of gas testing is to complete the equipment and devices pre-set and installed on the ground in order to safely and accurately complete the gas testing construction process. The conventional single-well gas testing process must be equipped with 2 sets of manifolds, 1 set of separators, and 1 metering pipeline. According to the requirements of on-site well control, the separator should be more than 30 meters away from the wellhead, the distance between the metering pipeline outlet and the wellhead should be greater than 50 meters, and the burner outlet should be more than 50 meters away from the wellhead.

[0003] With the increasing maturity and promotion of cluster well group development mode, the increasing demand for environmental protection and the increasing shortage of industrial land at well sites have led to a significant reduction in construction space. On the same platform, multiple types of work and multiple professional cross-operations are involved, and multiple teams are working at the same time. If the conventional single-well gas test layout is adopted, for the cluster well group formed by multiple wells, many pipelines and manifolds are required. For example, if there are 7 wells, 14 manifolds, 7 separators, and 7 metering pipelines are required on site. It takes a lot of space to arrange so many equipment and pipelines, and the current space cannot meet this layout.

[0004] Therefore, the current pipeline layout occupies a large area and cannot meet the safety standards of the on-site gas testing process of the cluster well group. Utility Model Content

[0005] The utility model aims to provide a gas testing system suitable for cluster well groups, so as to solve the problem that the current conventional single well gas testing process pipeline layout cannot meet the requirements of cluster well group gas testing safety standards.

[0006] In order to solve the above-mentioned technical problems, the utility model provides a gas testing system suitable for a cluster well group, comprising a process pipeline and a manifold, wherein there are at least two process pipelines, the number of the manifolds is equal to the number of wellheads, a manifold is correspondingly arranged at one wellhead, each manifold comprises at least two liquid outlet pipes, each liquid outlet pipe is connected to the corresponding process pipeline through a corresponding valve, each process pipeline is provided with a separator for realizing gas-liquid separation, the gas outlet of the separator is connected to a metering pipeline, and the liquid outlet of the separator is used to connect to a sewage tank.

[0007] The utility model configures a manifold for each wellhead, and each wellhead is connected to the metering pipeline through its own manifold, so that each wellhead is connected to the same metering pipeline through the corresponding manifold and valve, which not only saves the number of manifolds, but also saves the number of metering pipelines. There is no need to configure a metering pipeline for each wellhead separately, thereby reducing the investment in materials and equipment and the floor space. In order to meet the simultaneous testing of different processes, the utility model has at least two metering pipelines, and the simultaneous testing of different processes can be achieved by switching the manifold and the valve, which greatly improves the testing efficiency.

[0008] Furthermore, the gas testing system also includes a drainage pipeline, which is used to drain liquid when there is no gas in the liquid discharged from the wellhead in the early stage. The liquid outlet pipe of each manifold also includes a liquid outlet pipe connected to the drainage pipeline, and a corresponding valve is provided on the liquid outlet pipe. The liquid outlet of the drainage pipeline is used to connect to the sewage tank.

[0009] In order to meet the demand for rapid drainage in the early stage of drainage (i.e., gas-free liquid), the utility model also specially arranges a drainage pipeline for separate drainage. The drainage pipeline does not require gas-liquid separation, greatly improves the drainage efficiency, and meets the demand for large-scale drainage before gas is seen.

[0010] Furthermore, there are two process pipelines, namely a first process pipeline and a second process pipeline. A first separator is provided on the first process pipeline, the inlet of the first separator is connected to the first process pipeline, and the outlet of the first separator is connected to the first metering pipeline; a second separator is provided on the second process pipeline, the inlet of the second separator is connected to the second process pipeline, and the outlet of the second separator is connected to the second metering pipeline.

[0011] The utility model can meet the demand of simultaneous testing of different processes and reduce the occupied area by setting two process pipelines.

[0012] Furthermore, a combustion cylinder is arranged at the end of each metering pipeline.

[0013] The utility model arranges a combustion cylinder at the end of each metering pipeline, so that combustion processing can be performed after metering.

[0014] Furthermore, the valves arranged on each liquid outlet pipe on the manifold are plate valves, and the switching of the gas test process is achieved by controlling the manifold and each plate valve.

[0015] The utility model utilizes plate valves to control the switching of various pipelines, so that the control process is convenient, reliable and low in cost.

[0016] Furthermore, the valves arranged on each liquid outlet pipe on the manifold are solenoid valves, and the switching of the gas test process is achieved by controlling the manifold and each solenoid valve.

[0017] The utility model utilizes electromagnetic valves to control the switching of various pipelines to realize the automation of the control process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of pipeline arrangement in a gas testing system suitable for a cluster well group in an embodiment of the utility model. DETAILED DESCRIPTION

[0019] The specific implementation of the utility model will be further described below in conjunction with the accompanying drawings.

[0020] The utility model is suitable for a gas testing system for a cluster well group, including a process pipeline and a manifold, wherein there are at least two process pipelines, the number of manifolds is equal to the number of wellheads, a manifold is correspondingly arranged at one wellhead, each manifold includes at least two liquid outlet pipes, each liquid outlet pipe is connected to the corresponding process pipeline through a corresponding valve, each process pipeline is provided with a separator for realizing gas-liquid separation, the gas outlet of the separator is connected to a metering pipeline, and the liquid outlet of the separator is used to connect to a sewage tank. The utility model configures a manifold for each wellhead, and each wellhead is connected to the metering pipeline through its own manifold, so that each wellhead is connected to the same metering pipeline through a corresponding manifold and valve, wherein there are at least two metering pipelines. Therefore, the utility model can realize that the ground process layout of the gas test meets the requirements of well control, safety, and various working conditions, while improving the utilization efficiency of the site and reducing the workload of equipment installation and the usage of materials and equipment, effectively helping to speed up and improve the efficiency of fracturing gas testing operations.

[0021] The following is a detailed description taking a cluster well group consisting of 7 wells as an example.

[0022] like Figure 1As shown, the gas test system in this embodiment includes 7 manifolds, a drainage pipeline and two process pipelines, which correspond to 7 wells respectively. Each manifold is connected to the infusion pipeline of the corresponding well through a corresponding pipeline. For example, manifold No. 1 is used to connect to the infusion pipeline of well No. 1. Each manifold includes a plurality of liquid outlet pipes, three of which are connected to the drainage pipeline through a corresponding valve, and the other two liquid outlet pipes are connected to the corresponding process pipelines through corresponding valves. A separator for realizing gas-liquid separation is provided on each process pipeline. The gas outlet of the separator is connected to a metering pipeline, the liquid outlet of the separator is used to connect to a sewage tank, and the drainage pipeline is also connected to the sewage tank. For example, the No. 1 manifold is connected to the drainage pipeline, the first process pipeline and the second process pipeline through the corresponding outlet pipes, wherein the outlet pipe connected to the drainage pipeline is provided with a No. 1 valve, the outlet pipe connected to the first process pipeline is provided with a No. 2 valve, and the outlet pipe connected to the second process pipeline is provided with a No. 3 valve. A total of 21 valves are arranged in the 7 wells. In order to save costs, a manual gate valve is used in this embodiment to control the connection between the well and each pipeline. As other implementations, a solenoid valve can also be used to achieve automatic control.

[0023] Each process pipeline is provided with a corresponding separator, the first process pipeline is provided with a first separator, and the second process pipeline is provided with a second separator. Gas-liquid separation is achieved through the separator, and the separated liquid needs to be recovered into the sewage tank, and the separated gas can be metered. Therefore, the liquid outlet of the classifier is connected to the sewage tank, and the gas outlet is connected to the metering pipeline to achieve metering of the separated gas. In order to ensure that the post-fracturing drainage needs are met to the maximum extent, the separator processing capacity should be 500-800 cubic meters / day. In addition, considering the gas test stage, the amount of separated gas is relatively small, and the cost of collecting it is relatively high. Therefore, this embodiment is also provided with a combustion cylinder at the end of each metering pipeline to dispose of the metered gas by combustion.

[0024] Combine the following Figure 1 The working process of the arrangement of the system is described below.

[0025] When a pressure test is required on the wellbore, close all manual gate valves, open the corresponding manifold of the wellbore to be pressure tested, and complete the pressure test after connecting the pressure test equipment. For example, when a pressure test is required on Well No. 1, open Manifold No. 1 and connect it to the pressure test equipment.

[0026] Before the blowout operation is carried out, according to the location of the well to be blown out, the manual gate valves of the corresponding wellhead manifold and the drainage pipeline and process pipeline behind the manifold are opened to achieve the purpose of flexible blowout.

[0027] If it is necessary to perform a blowout operation on Well No. 1, and it is currently in the early stage of blowout, and there is no gas in the liquid, then open the No. 1 manifold and the No. 1 manual gate valve on the drainage pipeline connected to the No. 1 manifold, and select the drainage pipeline for blowout operation; when gas appears in the blowout liquid, close the No. 1 manual gate valve, open the No. 2 or No. 3 manual gate valve, and the first process pipeline or the second process pipeline can pass through the corresponding separator to meet the post-pressure early blowout and liquid drainage after gas is seen.

[0028] If it is necessary to perform blowout operation on wellhead 1 and wellhead 2 at the same time, open manifold No. 1 and manifold No. 2 respectively. If there is no gas in the blowout liquid, open manual gate valve No. 1 and manual gate valve No. 4, and perform blowout operation through the liquid discharge pipeline. In addition, the first process pipeline or the second process pipeline can be selected through the corresponding separator to meet the post-pressure early blowout and liquid discharge after seeing gas. If the first process pipeline is selected, open manual gate valve No. 2 and manual gate valve No. 3. If the second process pipeline is selected, open manual gate valve No. 3 and manual gate valve No. 4. In this way, the other unused process pipeline can be used by other wells at the same time. According to actual needs, well No. 1 can use the first process pipeline and well No. 2 can use the second process pipeline. If multiple wells are blowout at the same time, the above method can be used in sequence.

[0029] In actual operation, the number of blowout wellheads can be comprehensively selected according to the construction progress. At the same time, if a single well needs to be produced or metered according to the process requirements, the target well uses a separate set of separators, and the remaining wells share a set of separators to meet the production and metering requirements. For example, for production of Well No. 1, it is necessary to open the No. 1 manifold and the No. 2 manual gate valve, and close the No. 1 manual gate valve and the No. 3 manual gate valve; the operations of other wellheads are to open the No. 1 to No. 7 manifolds, open the No. 6, 9, 12, 15, 18, and No. 21 manual gate valves, connect the other wellheads to the second process pipeline, and close the No. 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, 19, and 20 manual gate valves, so that the No. 1 well can be produced or metered using the separator and metering pipeline on the first process pipeline, and the other wellheads can use the separator and metering pipeline on the first process pipeline to complete the production drainage work.

[0030] It can be seen that the cluster of 7 wellheads in this embodiment only needs to arrange 7 sets of manifolds, 2 sets of separators, 2 metering pipelines and 1 drainage pipeline to achieve the purpose of normal production of each wellhead. Compared with the traditional method, it effectively saves costs and floor space, can ensure the safe construction of multiple wellheads at the same time, and maximize the development efficiency.

[0031] As other implementations, the liquid discharge pipeline in this embodiment can also be omitted and directly replaced by a process pipeline. The process pipeline can also be used to recover the liquid without gas, but the separator does not work or no gas is discharged. Considering the site area and gas test efficiency, two process pipelines are set in this embodiment, and three can also be set as needed, provided that safe construction can be guaranteed.

[0032] Therefore, the pipeline used in the utility model meets the safety and environmental protection requirements, and has a reasonable design, simple installation, and convenient maintenance. It does not affect operations such as gas testing, fracturing, and later return fluid recovery, and will effectively improve construction efficiency.

Claims

1. A gas testing system suitable for cluster well groups, comprising a process pipeline and a manifold, characterized in that: There are at least two process pipelines, the number of manifolds is equal to the number of wellheads, one manifold is arranged at each wellhead, each manifold includes at least two liquid outlet pipes, each liquid outlet pipe is connected to the corresponding process pipeline through a corresponding valve, and each process pipeline is provided with a separator for realizing gas-liquid separation, the gas outlet of the separator is connected to a metering pipeline, and the liquid outlet of the separator is used to connect to a sewage tank.

2. The gas testing system suitable for cluster well groups according to claim 1, characterized in that: The gas testing system also includes a drainage pipeline, which is used to drain liquid when there is no gas in the liquid discharged from the wellhead in the early stage. The outlet pipe of each manifold also includes a liquid outlet pipe connected to the drainage pipeline, and a corresponding valve is provided on the liquid outlet pipe. The outlet of the drainage pipeline is used to connect to the sewage tank.

3. The gas testing system applicable to cluster well groups according to claim 1 or 2, characterized in that: There are two process pipelines, namely the first process pipeline and the second process pipeline. A first separator is arranged on the first process pipeline, the inlet of the first separator is connected to the first process pipeline, and the gas outlet of the first separator is connected to the first metering pipeline; a second separator is arranged on the second process pipeline, the inlet of the second separator is connected to the second process pipeline, and the gas outlet of the second separator is connected to the second metering pipeline.

4. The gas testing system applicable to cluster well groups according to claim 1, characterized in that: A combustion cylinder is arranged at the end of each metering pipeline.

5. The gas testing system applicable to cluster well groups according to claim 1 or 2, characterized in that: The valves arranged on each liquid outlet pipe on the manifold are plate valves, and the switching of the gas test process is achieved by controlling the manifold and each plate valve.

6. The gas testing system applicable to cluster well groups according to claim 1 or 2, characterized in that: The valves arranged on each liquid outlet pipe on the manifold are solenoid valves, and the switching of the gas test process is achieved by controlling the manifold and each solenoid valve.

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