CN-117662042-B - Control method and system for throttle well control manifold

CN117662042BCN 117662042 BCN117662042 BCN 117662042BCN-117662042-B

Abstract

The invention provides a control method and a system of a throttle well control manifold, wherein the throttle well control manifold is connected with a wellhead device and comprises a quick open flow channel and a common open flow channel which are arranged in parallel, and a throttle valve is arranged on the common open flow channel; the control method comprises the steps of monitoring wellhead casing pressure P a and riser pressure P 1 in real time, determining pressure difference between the wellhead casing pressure and the riser pressure, enabling drilling to work normally without opening a throttle well control manifold when P a -P l ＜P z , enabling the throttle well control manifold to be opened when P z ≤P a -P 1 ＜aP z , and dynamically adjusting the throttle valve opening according to a throttle valve opening processing model, and enabling a quick blowout channel to implement blowout operation when P a -P 1 ≥aP z or no drilling fluid in a separator can be recovered and the well is full of gas. The invention adopts multichannel control in the process of realizing the open flow operation, and ensures the timeliness and the safety of the open flow.

Inventors

WANG SHIQIANG
HOU XIAOMEI
GUO MENGMENG
YU JIAMIN
ZHAO QIYUE
HU YAN
HE SHA
YU JIANSHENG
YU PEIHANG
CHEN WENBIN
FENG XIAOHUI
LIU HUI
XU QIANG
LUO JIQING

Assignees

中国石油天然气集团有限公司
中国石油集团川庆钻探工程有限公司

Dates

Publication Date: 20260508
Application Date: 20220826

Claims (8)

1. The control method of the throttle well control manifold is characterized in that the throttle well control manifold is used for being connected with a wellhead device and comprises a first blowout channel and a second blowout channel which are arranged in parallel, and a throttle valve is arranged on the second blowout channel; The control method comprises the following steps: Monitoring wellhead casing pressure P a and riser pressure P 1 in real time, and determining the pressure difference between the wellhead casing pressure and the riser pressure; At the position of Under the condition of (1), drilling normally works without opening a throttling well control manifold; At the position of In the case of (a), opening a throttle kill manifold and dynamically adjusting a throttle opening based on a throttle opening processing model, and At the position of Under the condition that no drilling fluid can be recovered in the separator, and when the well is completely gas, the first open flow channel is opened to implement open flow operation; wherein P z is a pressure difference early warning value, a is a pressure difference early warning correction coefficient, a >1, the vertical pipe is a high-pressure manifold positioned on the derrick, and the separator is connected with the throttle well killing manifold and is matched with the throttle well killing manifold for use; The throttle opening processing model is as follows: If it is The throttle opening is d i+1 : , If it is The throttle opening is d i+1 : , Wherein i represents the adjustment of the throttle opening at the time of the i-th adjustment, P a(i+1) represents the wellhead casing pressure at the time of the i+1th adjustment, MPa, P ai represents the wellhead casing pressure at the time of the i-th adjustment, MPa, d i+1 represents the throttle opening at the time of the i+1th adjustment, d i-1 represents the throttle opening at the time of the i-1 th adjustment, d i- represents the throttle opening at the time of the i-th adjustment, t i+1 represents the retention time of the opening d i+1 at the time of the i+1th adjustment, s, and t i represents the retention time of the opening d i at the time of the i-th adjustment.
2. The control method of the throttle kill manifold according to claim 1, wherein the control method adopts a multi-stage control mode, including a primary control mode, a secondary control mode and a tertiary control mode, the primary control mode adopts intelligent control, the secondary control mode adopts automatic control, and the tertiary control mode adopts manual control.
3. The method for controlling a choke and kill manifold as set forth in claim 1, wherein a plurality of second blow-out passages are provided, and the plurality of second blow-out passages are connected in parallel and are mutually reserved.
4. A method of controlling a choke and kill manifold as set forth in claim 3, wherein said opening a choke and kill manifold includes: Opening a throttle valve on a second discharge channel to a specified opening degree so as to enable ; If the throttle valve on one second discharge channel fails or does not reach the designated opening degree, opening the throttle valve on the other second discharge channel in the plurality of second discharge channels to the designated opening degree so as to enable ; If all the throttle valves of the second discharge channel are adjusted to be fully opened, the pressure difference is continuously increased to the upper limit value, and the pressure maintaining time exceeds the first preset time, the first discharge channel is opened to enable 。
5. The method of claim 4, further comprising, when the choke manifold is already in a blow-out condition, and Is maintained for a time exceeding a first predetermined time, while the wellhead is being set And (3) continuously maintaining high pressure, connecting a well killing manifold, forcibly filling drilling fluid into the well shaft, and implementing well killing operation.
6. The control system of the throttle well control manifold is characterized in that the throttle well control manifold is used for being connected with a wellhead device, and comprises a first blowout channel and a second blowout channel which are arranged in parallel, and a throttle valve is arranged on the second blowout channel; The control system is connected with the throttling well control manifold and comprises an acquisition unit and a control unit, wherein, The acquisition unit is respectively connected with the wellhead device and the vertical pipe and is configured to acquire a pressure difference signal between wellhead casing pressure and vertical pipe pressure; the control unit is respectively connected with the acquisition unit, the first open flow channel and the second open flow channel, and is configured to be capable of intelligently controlling the opening and closing of the first open flow channel and the second open flow channel and dynamically adjusting the opening of the throttle valve.
7. The control system of a choke and kill manifold of claim 6, wherein the control unit includes a determination module, a first control module, a second control module, and a third control module, wherein the determination module is coupled to the acquisition unit and configured to compare a magnitude of a pressure differential P a -P 1 between a wellhead casing pressure and a riser pressure with a magnitude of a pressure differential P z and an aP z , and output a comparison result; The first control module is connected with the judging module and is configured to display as a comparison result When the first and second discharge channels are controlled to be closed; The second control module is connected with the judging module and is configured to display as a comparison result When the throttle valve is opened, one or more second open flow channels are controlled to be opened, or all the second open flow channels and the first open flow channels are controlled to be opened, and the opening of the throttle valve is dynamically adjusted; the third control module is connected with the judging module and is configured to display as a comparison result And when the first blowout channel is controlled to be opened.
8. The control system of a choke and kill manifold of claim 7, wherein the control unit further includes a display module configured to display valve status and choke opening on the first and second blow-out passages.

Description

Control method and system for throttle well control manifold Technical Field The invention relates to the technical field of oil and gas well control, in particular to a control method of a throttle well control manifold and a control system of the throttle well control manifold. Background With the development of oil and gas field exploration, the development of the oil and gas field is advanced greatly in the new field, ultra-deep layer and unconventional direction, under the drive of a double-carbon target, the oil stabilization and gas enhancement are the necessary trend of energy development, the development force of natural gas is continuously increased, and the well control risk is increased. In recent years, overflow dangerous situations show an ascending trend, and well control emergency guarantee capability is improved. In general, the well control risk of the three-high one-super well is the largest, the well control problem of the two-shallow well is also very prominent, and the unconventional oil and gas industrial operation brings new well control problems. Meanwhile, the high-pressure high-yield high-sulfur-content ultra-deep wells are increased, geological engineering conditions are complicated, and the technical difficulty of well drilling and completion and the risk of well control are further increased. At present, the well drilling pressure is balanced and controlled mainly by using a throttling well-killing manifold. When the oil gas well is shut down by the overflow of the well kick, the gas gradually slips and rises to the well mouth in the well shaft, the well closing time is long due to some reasons, the well closing pressure of the well mouth, namely the casing pressure, is increased, and the pressure of the well mouth is relieved, namely the emission of the accumulated gas at the well mouth is required to be opened and closed through a throttling well-killing manifold throttle valve of a ground device. The throttle valve of the throttle well-killing manifold is opened and closed to control certain back pressure of the shaft, so as to maintain the balance of the bottom hole pressure system and achieve the purpose of controlling blowout. The development of the control technology of the throttle killing manifold is continuously improved for nearly one hundred years, and the technology is mainly from a single-stage throttle valve of the throttle killing manifold to a multi-stage throttle valve of the throttle killing manifold, from manual control of the throttle opening to hydraulic automatic control to electrohydraulic combined automatic control, and with the development of computer technology and intelligent control technology in recent years, the multi-stage throttle valve control technology of the computer automatic control is developed successively. For example, the patent document with publication number CN104035383A discloses a wireless remote centralized control system for a ground blowout preventer and a choke manifold, which are disclosed in 2014, 9 and 10, and the system comprises a choke manifold and an electric control system, wherein the choke manifold comprises at least two channel choke manifolds and at least two radial choke manifolds, the radial choke manifolds are used for connecting the multi-channel choke manifolds, the electric control system comprises a pressure sensor, an electric valve, a communication switching box, a power switching box, a remote control box and a remote operation table, which are arranged on the choke manifold, and the full-automatic control system for the high-pressure choke manifold supports four control modes of local manual control, local electric control, local infrared remote control and remote touch screen control. However, although the method can be controlled by a wireless remote control station, intelligent control cannot be implemented on the throttle killing manifold, and emergency situations in drilling operation still need to be controlled and regulated by off-site personnel or drillers, so that intelligent application of the method is limited. The invention discloses a pressure control drilling ground throttling control manifold device in 2022, 6 and 17 days, and patent literature with publication number CN216767326U describes the pressure control drilling ground throttling control manifold device which comprises a PLC controller, an electric control throttling valve, a gate valve and a throttling diversion manifold system, wherein the electric control throttling valve and the gate valve are respectively arranged in the throttling diversion manifold system, the throttling diversion manifold system comprises a branch I, a branch II, a branch III, a branch IV and a branch V, the branch I, the branch II and the branch III are connected through a tee T6, the branch IV is connected with the branch II through a tee T7, and the branch V is connected with the branch III through a tee T5. However, the ground automatic throttle control