A throttle manifold control system

Abstract

The present invention discloses a throttle manifold control system, which relates to the technical field of oil and gas equipment. The present invention comprises a throttle manifold control box, a throttle valve, a riser pressure sensor, a casing pressure sensor, and a casing density sensor; a controller, a hydraulic valve group, and a display component are arranged in the throttle manifold control box; the controller is electrically connected to the riser pressure sensor and the casing pressure sensor to obtain the riser pressure value and the casing pressure value; the casing density sensor is arranged at the wellhead to perform density detection in the casing, and the controller is electrically connected to the casing density sensor to obtain the casing density value; the controller is electrically connected to the drilling system to obtain the rotation speed of the drill bit; the controller initially adjusts the throttle valve based on changes in the drilling speed and the riser pressure value; when the casing pressure sensor detects a change in the casing pressure value, the controller performs feedback adjustment on the throttle valve; the controller is electrically connected to the display component, and the display component is used to display data.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas equipment, and in particular relates to a throttling manifold control system. Background Art

[0002] The choke manifold control box is a crucial piece of equipment in oil and gas production. It monitors riser and casing pressures and maintains downhole pressure balance by regulating the choke valves. The choke manifold control box typically features a hydraulic valve block to control the choke valves and multiple digital meters to display various parameters.

[0003] When balancing downhole pressure, the main references are casing pressure and vertical pressure. However, when gas and liquid intrusion occurs underground, the impact on the casing pressure at the wellhead has a lag. Once the situation develops badly, it will turn into a blowout in a short time and cause an accident. Therefore, effective control of the throttle valve becomes very critical.

[0004] Existing products mainly rely on manual control for throttle valves, which analyze the situation by observing parameters and then control the throttle valve. This has the problems of slow response, inaccurate adjustment, and reliance on experience.

[0005] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0006] The present invention provides a throttle manifold control system, comprising a throttle manifold control box, a throttle valve, a riser pressure sensor, a casing pressure sensor, and a casing density sensor; the throttle manifold control box is provided with a controller, a hydraulic valve group, and a display component;

[0007] The controller is electrically connected to the riser pressure sensor and the casing pressure sensor to obtain the riser pressure value and the casing pressure value;

[0008] The casing density sensor is arranged at the wellhead to detect the density inside the casing, and the controller is electrically connected to the casing density sensor to obtain the casing density value;

[0009] The controller is electrically connected to the drilling system and is used to obtain the rotation speed of the drill bit;

[0010] The controller performs initial adjustment on the throttle valve based on the change in the rotational speed value; during the initial adjustment, the throttle valve opening is adjusted based on the following formula:

[0011]

[0012] in, Indicates the increment of the throttle valve's adjustment opening; Indicates the basic adjustment opening of the throttle valve; Indicates the rated speed of the drill bit; Indicates the current speed of the drill bit;

[0013] When the casing pressure sensor detects a change in the casing pressure value, the controller performs feedback adjustment on the throttle valve;

[0014] The feedback adjustment process is as follows: when the casing pressure sensor detects a change in the casing pressure value, it performs sampling for several cycles and adjusts the opening of the throttle valve based on the following formula:

[0015]

[0016] in, Indicates the increment of the throttle valve's adjustment opening; Indicates the basic adjustment opening of the throttle valve; Indicates the density of the drilling fluid in the casing during the first sampling period; Indicates the density of the drilling fluid in the casing during the second sampling period; Indicates the The density of the drilling fluid in the casing during the sampling period, n≥3; Indicates the casing pressure value in the first sampling period; Indicates the Casing pressure value in each sampling period;

[0017] The controller is electrically connected to the display component, and the display component is used to display data.

[0018] In one embodiment of the present invention, “the controller is based on a change in the rotational speed value” means that the rotational speed reaches a preset first multiple interval and lasts for a predetermined time.

[0019] In one embodiment of the present invention, the first multiple intervals are [1.05-1.45] and [0.65-0.95].

[0020] The present invention also provides another throttle manifold control system, comprising a throttle manifold control box, a throttle valve, a riser pressure sensor, a casing pressure sensor, and a casing density sensor; the throttle manifold control box is provided with a controller, a hydraulic valve group, and a display component;

[0021] The controller is electrically connected to the riser pressure sensor and the casing pressure sensor to obtain the riser pressure value and the casing pressure value;

[0022] The casing density sensor is arranged at the wellhead to detect the density inside the casing, and the controller is electrically connected to the casing density sensor to obtain the casing density value;

[0023] The controller is electrically connected to the drilling system and is used to obtain the rotation speed of the drill bit;

[0024] The controller performs an initial adjustment on the throttle valve based on the change in the riser pressure value. During the initial adjustment, the throttle valve opening is adjusted based on the following formula:

[0025]

[0026] in, Indicates the increment of the throttle valve's adjustment opening; Indicates the basic adjustment opening of the throttle valve; Indicates the current standpipe pressure value; Indicates the rated standpipe pressure value;

[0027] The feedback adjustment process is as follows: when the casing pressure sensor detects a change in the casing pressure value, it performs sampling for several cycles and adjusts the opening of the throttle valve based on the following formula:

[0028]

[0029] in, Indicates the increment of the throttle valve's adjustment opening; Indicates the basic adjustment opening of the throttle valve; Indicates the density of the drilling fluid in the casing during the first sampling period; Indicates the density of the drilling fluid in the casing during the second sampling period; Indicates the The density of the drilling fluid in the casing during the sampling period, n≥3; Indicates the casing pressure value in the first sampling period; Indicates the Casing pressure value in each sampling period;

[0030] The controller is electrically connected to the display component, and the display component is used to display data.

[0031] In one embodiment of the present invention, “the controller is based on the change of the riser pressure value” means that the rotation speed remains unchanged, but the riser pressure value reaches a preset second multiple range.

[0032] In one embodiment of the present invention, the second multiple intervals are [1.05-1.25] and [0.75-0.95].

[0033] In one embodiment of the present invention, the display assembly includes a standpipe pressure gauge, a casing pressure gauge, a throttle valve opening gauge, a density gauge, a flow meter, and a tachometer.

[0034] Compared with the prior art, the present invention achieves the following technical effects:

[0035] (1) Make a preliminary judgment based on the drill bit speed and riser pressure values. Because these two parameters generally have no hysteresis, although it is impossible to immediately and accurately judge the details when an abnormal situation occurs, corresponding adjustments can still be made based on parameter changes. This not only helps maintain downhole pressure balance, but also creates more time for other control measures.

[0036] (2) After the initial adjustment, if the situation still changes or even worsens, it can be reflected through the casing pressure value and the casing density value, and the throttle valve opening can be further regulated based on this. The key is to be able to reflect the degree of change in the situation and make corresponding adjustments.

[0037] (III) The existing technology for regulating the throttle valve is usually based on experience and manual operation. The present invention uses quantitative data as a reference, which is fed back to the regulation range of the throttle valve opening, making the regulation more reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a connection block diagram of the throttling manifold control system of the present invention. DETAILED DESCRIPTION

[0039] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations such as "include" or "comprising", etc., will be understood to include the stated elements or components but not to exclude other elements or other components.

[0040] The technical solutions of the present invention are described below by means of specific embodiments. It should be understood that one or more steps mentioned in the present invention do not exclude the presence of other methods and steps before and after the combination step, or other methods and steps may be inserted between these explicitly mentioned steps. It should also be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. Unless otherwise specified, the numbering of each method step is only for the purpose of identifying each method step, and does not limit the order of arrangement of each method or the scope of implementation of the present invention. Changes or adjustments in their relative relationships can also be regarded as the scope of implementation of the present invention without substantial changes in the technical content.

[0041] The sources of the raw materials and instruments used in the examples are not particularly limited and can be purchased from the market or prepared according to conventional methods known to those skilled in the art.

[0042] like Figure 1 As shown, the present invention discloses a throttle manifold control box, a throttle valve, a riser pressure sensor, a casing pressure sensor, and a casing density sensor; the throttle manifold control box is provided with a controller, a hydraulic valve group, and a display component.

[0043] The controller is electrically connected to the riser pressure sensor and the casing pressure sensor to obtain the riser pressure value and the casing pressure value. The settings of the riser pressure sensor and the casing pressure sensor are both existing technologies.

[0044] The casing density sensor is installed at the wellhead and can be located near the casing pressure sensor to detect the density inside the casing. The controller is electrically connected to the casing density sensor to obtain the casing density value.

[0045] The hydraulic valve group is an existing device that drives the throttle valve to operate. It is installed in the throttle manifold control box and is controlled by the controller.

[0046] The controller is electrically connected to the drilling system and is used to obtain the rotation speed of the drill bit.

[0047] The controller is electrically connected to the display assembly, which is used to display data. The display assembly includes a riser pressure gauge, a casing pressure gauge, a throttle valve opening gauge, a density gauge, a flow meter, and a tachometer.

[0048] The controller performs initial adjustment on the throttle valve based on the change in the speed value. "The controller performs initial adjustment on the throttle valve based on the change in the speed value" means that the speed reaches the preset first multiple interval and lasts for a predetermined time. The first multiple interval is [1.05-1.45] and [0.65-0.95]. When it is less than the first multiple interval, it can be regarded as a fluctuation, and when it exceeds the first multiple interval, it is regarded as a special case. For example, when the drill bit enters a cave, the speed will soar. There are corresponding specific measures for special cases, but the present invention does not deal with special cases. This concept also applies to the second multiple interval below, so no additional explanation is given about the second multiple interval. The adjustment of the throttle valve opening during the initial adjustment process is based on the following formula (1):

[0049] Formula (1)

[0050] in, Indicates the increment of the throttle valve's adjustment opening; Indicates the basic adjustment opening of the throttle valve; Indicates the rated speed of the drill bit; Indicates the current speed of the drill bit;

[0051] In actual operation, when the speed reaches the first multiple interval and lasts for at least three seconds, if three seconds is taken as an example, the current speed of the drill bit is extracted at the end of three seconds and substituted into formula (1) for calculation. Then, the change in the riser pressure value is compared. If the riser pressure value increases, the throttle valve is adjusted in the direction of increasing; if the riser pressure value decreases, the throttle valve is adjusted in the direction of decreasing. The specific adjustment is based on the change in speed. Under the current operating conditions, the opening adjustment of the throttle valve generally does not exceed 10% each time, so The value is 10%, but it can also be adjusted according to actual conditions. A lower limit can also be set.

[0052] This process triggers the throttle valve control by changing the drill bit speed. The direction of adjustment is determined based on the riser pressure. The change in speed determines the amount of throttle valve opening adjustment. The goal is to initially maintain downhole pressure balance and prevent a rapid deterioration in the wellbore. The control range is relatively conservative.

[0053] Alternatively, the controller performs initial adjustment of the throttle valve based on changes in the riser pressure value. "The controller performs initial adjustment based on changes in the riser pressure value" means that the speed remains unchanged, but the riser pressure value reaches a preset second multiple interval. The second multiple interval is [1.05-1.25] and [0.75-0.95]. The casing pressure value can be sampled at a fixed frequency. During the initial adjustment process, the throttle valve opening is adjusted based on the following formula (2):

[0054] Formula (2)

[0055] in, Indicates the increment of the throttle valve's adjustment opening; Indicates the basic adjustment opening of the throttle valve; Indicates the current standpipe pressure value; Indicates the rated standpipe pressure value;

[0056] Similarly: if the riser pressure value increases, the throttle valve opening is increased, and if the riser pressure value decreases, the throttle valve opening is reduced.

[0057] The two parts of the initial adjustment mentioned above exist simultaneously, and the key is which situation is triggered. In some cases, downhole pressure can be controlled by changing the density of the drilling fluid. However, the change in drilling fluid density and its delivery take time. Therefore, when a change in value is detected, an immediate response is made by adjusting the throttle valve to deal with the abnormal situation, achieving a similar control effect and preventing the situation from deteriorating rapidly. When other remedial measures are ready, the throttle valve can still be reset. This is also the purpose of the initial adjustment.

[0058] When the casing pressure sensor detects a change in the casing pressure value, the controller performs feedback adjustment on the throttle valve.

[0059] The feedback adjustment process is as follows: when the casing pressure sensor detects a change in the casing pressure value, it performs sampling for several cycles and adjusts the throttle valve opening based on the following formula (3):

[0060] Formula (3)

[0061] in, Indicates the increment of the throttle valve's adjustment opening; Indicates the basic adjustment opening of the throttle valve; Indicates the density of the drilling fluid in the casing during the first sampling period; Indicates the density of the drilling fluid in the casing during the second sampling period; Indicates the The density of the drilling fluid in the casing during the sampling period is ≥3; Indicates the casing pressure value in the first sampling period; Indicates the The casing pressure value under each sampling period.

[0062] When the feedback adjustment is triggered, it means that the initial adjustment is not sufficient for the pressure balance, and the casing pressure continues to change, so further adjustment is needed. For example, gas intrusion or liquid intrusion often occurs during drilling, but the key is to examine the trend of density changes to determine whether the intrusion situation is developing in a more serious direction. If the density increases or decreases more, the final calculation result will be higher, and the control range of the throttle valve will be larger, but the control range should be limited to no more than The size of itself.

[0063] After feedback adjustment is completed, the casing pressure value is judged. If the casing pressure value returns to the initial state, the throttle valve is further adjusted. Specifically, the throttle valve is adjusted from the current opening to the initial opening or close to the initial opening to restore the operating condition to the initial state as much as possible. If the casing pressure value further deviates from the initial state, feedback adjustment is iteratively performed until the casing pressure value returns to the initial state. When the casing pressure returns to the initial state, the throttle valve is adjusted based on the following formula (4):

[0064] Formula (4)

[0065] in, represents the adjustment coefficient; Indicates the casing pressure value from becomes the time taken; Indicates the current throttle valve opening value; Indicates the initial opening value of the throttle valve; Indicates the time required to adjust the throttle valve from the current opening to the initial opening.

[0066] Based on formula (4), the time required to adjust the throttle valve again can be solved. During the adjustment process, since the initial and final positions of the opening are known, the key lies in the adjustment speed. Therefore, a reference time parameter is needed to facilitate the automation of the control process.

[0067] The advantages of the present invention are:

[0068] (1) Make a preliminary judgment based on the drill bit speed and riser pressure values. Because these two parameters generally have no hysteresis, although it is impossible to immediately and accurately judge the details when an abnormal situation occurs, corresponding adjustments can still be made based on parameter changes. This not only helps maintain downhole pressure balance, but also creates more time for other control measures.

[0069] (2) After the initial adjustment, if the situation still changes or even worsens, it can be reflected through the casing pressure value and the casing density value, and the throttle valve opening can be further regulated based on this. The key is to be able to reflect the degree of change in the situation and make corresponding adjustments.

[0070] (3) In the prior art, throttle valve control is usually based on empirical judgment and manual operation. The present invention uses quantitative data as a reference, which is fed back into the control range of the throttle valve opening, making the control more reasonable.

[0071] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A throttle manifold control system, characterized in that: It includes a throttle manifold control box, a throttle valve, a riser pressure sensor, a casing pressure sensor, and a casing density sensor; the throttle manifold control box is equipped with a controller, a hydraulic valve group, and a display component; The controller is electrically connected to the riser pressure sensor and the casing pressure sensor to obtain the riser pressure value and the casing pressure value; The casing density sensor is arranged at the wellhead to detect the density inside the casing, and the controller is electrically connected to the casing density sensor to obtain the casing density value; The controller is electrically connected to the drilling system and is used to obtain the rotation speed of the drill bit; The controller performs initial adjustment on the throttle valve based on the change in the rotational speed value; during the initial adjustment, the throttle valve opening is adjusted based on the following formula: in, Indicates the increment of the throttle valve's adjustment opening; Indicates the basic adjustment opening of the throttle valve; Indicates the rated speed of the drill bit; Indicates the current speed of the drill bit; Determine the adjustment direction based on the riser pressure value; When the casing pressure sensor detects a change in the casing pressure value, the controller performs feedback adjustment on the throttle valve. The feedback adjustment process is: when the casing pressure sensor detects a change in the casing pressure value, it performs sampling for several cycles and adjusts the opening of the throttle valve based on the following formula: in, Indicates the increment of the throttle valve's adjustment opening; Indicates the basic adjustment opening of the throttle valve; Indicates the density of the drilling fluid in the casing during the first sampling period; Indicates the density of the drilling fluid in the casing during the second sampling period; Indicates the The density of the drilling fluid in the casing during the sampling period is ≥3; Indicates the casing pressure value in the first sampling period; Indicates the Casing pressure value in each sampling period; The controller is electrically connected to the display component, and the display component is used to display data.

2. A throttle manifold control system according to claim 1, characterized in that: "The controller is based on the change of the speed value" means that the speed reaches a preset first multiple interval and lasts for a predetermined time.

3. A throttle manifold control system according to claim 2, characterized in that: The first multiple intervals are [1.05-1.45] and [0.65-0.95].

4. A throttle manifold control system, characterized in that: It includes a throttle manifold control box, a throttle valve, a riser pressure sensor, a casing pressure sensor, and a casing density sensor; the throttle manifold control box is equipped with a controller, a hydraulic valve group, and a display component; The controller is electrically connected to the riser pressure sensor and the casing pressure sensor to obtain the riser pressure value and the casing pressure value; The casing density sensor is arranged at the wellhead to detect the density inside the casing, and the controller is electrically connected to the casing density sensor to obtain the casing density value; The controller is electrically connected to the drilling system and is used to obtain the rotation speed of the drill bit; The controller performs an initial adjustment on the throttle valve based on the change in the riser pressure value. During the initial adjustment, the throttle valve opening is adjusted based on the following formula: in, Indicates the increment of the throttle valve's adjustment opening; Indicates the basic adjustment opening of the throttle valve; Indicates the current standpipe pressure value; Indicates the rated standpipe pressure value; When the casing pressure sensor detects a change in the casing pressure value, the controller performs feedback adjustment on the throttle valve; The feedback adjustment process is as follows: when the casing pressure sensor detects a change in the casing pressure value, it performs sampling for several cycles and adjusts the opening of the throttle valve based on the following formula: in, Indicates the increment of the throttle valve's adjustment opening; Indicates the basic adjustment opening of the throttle valve; Indicates the density of the drilling fluid in the casing during the first sampling period; Indicates the density of the drilling fluid in the casing during the second sampling period; Indicates the The density of the drilling fluid in the casing during the sampling period is ≥3; Indicates the casing pressure value in the first sampling period; Indicates the Casing pressure value in each sampling period; The controller is electrically connected to the display component, and the display component is used to display data.

5. A throttle manifold control system according to claim 4, characterized in that: “The controller is based on the change of the riser pressure value” means that the rotation speed remains unchanged, but the riser pressure value reaches a preset second multiple range.

6. A throttle manifold control system according to claim 5, characterized in that: The second multiple intervals are [1.05-1.25] and [0.75-0.95].

7. A throttle manifold control system according to claim 1 or 4, characterized in that: The display assembly includes a riser pressure gauge, a casing pressure gauge, a throttle valve opening gauge, a density gauge, a flow meter, and a tachometer.

Images