CN-119266794-B - Device and method for monitoring deep well overflow leakage of fractured stratum

CN119266794BCN 119266794 BCN119266794 BCN 119266794BCN-119266794-B

Abstract

The invention discloses a deep well overflow and leakage monitoring device for a fractured stratum, which comprises an inlet flow sensor, a pumping pressure sensor and an outlet flow sensor, wherein the inlet flow sensor is arranged on a drill rod, the pumping pressure sensor is arranged on the drill rod, and the outlet flow sensor is arranged on a slurry outlet pipe. The invention also discloses a method for monitoring the overflow leakage of the deep well of the fractured stratum. According to the invention, the pump pressure, the drilling fluid inlet flow and the drilling fluid outlet flow are obtained in real time through the sensors and transmitted to the computer, the calculated and set threshold values are compared through the computer, so that the purposes of underground overflow and lost circulation early warning are achieved, timeliness of early warning monitoring is ensured through real-time data transmission, compared with the traditional mode of alarming through subjective judgment of experience, early warning precision is effectively improved, lost circulation overflow can be timely found and accurately predicted in the drilling process, and major accidents are avoided.

Inventors

ZHAO CHAOJIE
WANG XUE
JIN YANXIN
LIU MINGGANG
GAO KAIGE
LIN YU
XIA XIRAN

Assignees

中国石油化工股份有限公司
中石化安全工程研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20230707

Claims (7)

1. A method for monitoring overflow leakage of a deep well of a fractured stratum is characterized in that the method is implemented by adopting a device for monitoring overflow leakage of the deep well of the fractured stratum, a drill rod is arranged in a shaft of the deep well, and a slurry outlet pipe communicated with the shaft is arranged at the upper part of the shaft; the deep well overflow leakage monitoring device comprises an inlet flow sensor, a pumping pressure sensor and an outlet flow sensor; the inlet flow sensor is arranged on the drill rod; The pump pressure sensor is arranged on the drill rod; the outlet flow sensor is arranged on the pulp outlet pipe; the deep well overflow leakage monitoring device also comprises a computer; the inlet flow sensor, the pump pressure sensor and the outlet flow sensor are all connected with a computer; the monitoring method comprises the following steps: Step 1, synchronously starting an inlet flow sensor, a pumping pressure sensor and an outlet flow sensor at each interval Data transmission is carried out on the computer, the inlet flow sensor transmits the inlet flow of drilling fluid, the pumping pressure sensor transmits the pumping pressure, and the outlet flow sensor transmits the outlet flow of drilling fluid; Step 2, calculating the change rate of the difference between the drilling fluid outlet flow and the drilling fluid inlet flow by a computer Rate of change of pump pressure difference ; (1) In the formula (1) (2) (3) (4) In (4) (5) (6) Wherein: the difference between the drilling fluid outlet flow and the drilling fluid inlet flow is the i+1th time node; the difference between the drilling fluid outlet flow and the drilling fluid inlet flow is the ith time node; drilling fluid outlet flow for the (i+1) th time node; drilling fluid inlet flow for the (i+1) th time node; drilling fluid outlet flow for the ith time node; drilling fluid inlet flow for the ith time node; the difference between the pump pressure for the i+2th time node and the pump pressure for the i+1th time node; The difference between the pump pressure for the i+1th time node and the pump pressure for the i time node; Pumping for the (i+2) th time node; Pumping for the (i+1) th time node; pumping for the ith time node; i is a time node; Is the duration between adjacent time nodes; Step 3, according to the calculated change rate of the difference between the drilling fluid outlet flow and the drilling fluid inlet flow Rate of change of pump pressure difference Judging whether lost circulation or overflow occurs; in the step 3, according to the calculated change rate of the difference between the drilling fluid outlet flow and the drilling fluid inlet flow Rate of change of pump pressure difference The method for judging whether lost circulation or overflow occurs is as follows: When (when) Are all smaller than And (2) and Are all smaller than Judging that the well is lost; When (when) Are all larger than And (2) and Are all larger than Judging that the overflow exists; Wherein: According to the actual determination on site; in the step 3, N is more than or equal to 2 and less than or equal to 4.
2. The method for monitoring the overflow leakage of the deep well of the fractured stratum according to claim 1, wherein the computer is connected with an alarm.
3. The method for monitoring the overflow leakage of the deep well of the fractured stratum according to claim 1, wherein the outlet flow sensor is a pipeline type electromagnetic flowmeter.
4. The method for monitoring the overflow leakage of the deep well of the fractured stratum according to claim 1, wherein the inlet flow sensor is an external clamp type ultrasonic sensor.
5. The method for monitoring the overflow leakage of the deep well of the fractured stratum according to claim 4, wherein the number of the external clamp type ultrasonic sensors is two.
6. The method for monitoring the overflow leakage of the deep well of the fractured stratum according to claim 5, wherein the distance between the two external clamp type ultrasonic flowmeters is 20-30 cm.
7. The method for monitoring the overflow of the deep well of the fractured stratum according to claim 1, wherein in the step 3, an alarm is given out after the occurrence of the overflow or the overflow is judged.

Description

Device and method for monitoring deep well overflow leakage of fractured stratum Technical Field The invention belongs to the technical field of drilling engineering, and particularly relates to a device and a method for monitoring overflow leakage of a deep well of a fractured stratum. Background With the progress of exploration and development of oil and gas fields, drilling of deep wells, ultra-deep wells, horizontal wells, directional wells and windowed side drilling wells is increased, higher requirements are put on-site overflow and lost circulation data monitoring, and well control management difficulty is increased. The well overflow and leakage monitoring technology is an important technology of a well drilling site, and the safety of a well drilling process can be guaranteed when the well is drilled. At present, the whole overflow and leakage monitoring technology of the drilling site still utilizes the changes of real-time drilling engineering parameter monitoring, slurry circulation parameters and gas measurement parameters to identify overflow and leakage, and the judging mode is mainly finished by site staff through personal experience, specifically: The method comprises the steps of directly measuring parameters by observing the comprehensive logging instrument, timely capturing the seedling head of an accident by observing the change of multiple parameters, observing the change of the liquid level of the slurry tank, keeping the liquid level of the slurry tank to be up and down fluctuated near a certain value in a normal drilling state, rising the liquid level of the slurry tank when an overflow accident occurs, and falling the liquid level of the slurry tank when a lost circulation accident occurs. The existing overflow leakage monitoring technology has a plurality of problems in the use process: (1) The method for monitoring the comprehensive logging technology is limited by equipment quality and personnel quality, and meanwhile, because the identification of accidents is judged by logging technicians through personal experience, serious defects exist in the aspect of intelligence; (2) The method for observing the liquid level of the slurry pool can monitor overflow and lost circulation, but the method has serious time delay and insufficient early warning instantaneity, and the sensitivity of the liquid level rising amplitude to tiny overflow and lost circulation is insufficient due to the large area of the bottom of the slurry pool. Based on the problems, the application provides a device and a method for monitoring the overflow leakage of a deep well in a fractured stratum, which are used for acquiring a pump pressure, a drilling fluid inlet flow and a drilling fluid outlet flow in real time through sensors and transmitting the pump pressure, the drilling fluid inlet flow and the drilling fluid outlet flow to a computer, and comparing the calculated flows with a set threshold value through the computer, so that the purposes of underground overflow and overflow early warning are achieved. Disclosure of Invention The invention aims to overcome the defects in the prior art and provide a device and a method for monitoring deep well overflow leakage of a fractured stratum. In order to achieve the above purpose, the invention adopts the following technical scheme: a device for monitoring overflow leakage of a deep well in a fractured stratum, wherein a drill rod is arranged in a shaft of the deep well, and a slurry outlet pipe communicated with the shaft is arranged at the upper part of the shaft; the deep well overflow leakage monitoring device comprises an inlet flow sensor, a pumping pressure sensor and an outlet flow sensor; the inlet flow sensor is arranged on the drill rod; The pump pressure sensor is arranged on the drill rod; The outlet flow sensor is arranged on the pulp outlet pipe. Preferably, the deep well overflow leakage monitoring device further comprises a computer; the inlet flow sensor, the pump pressure sensor and the outlet flow sensor are all connected with a computer. Preferably, the computer is connected with an alarm. Preferably, the outlet flow sensor is a pipeline type electromagnetic flowmeter. Preferably, the inlet flow sensor is an external clip type ultrasonic sensor. Preferably, the outer clip type ultrasonic sensor has two. Preferably, the distance between the two external clamp type ultrasonic flow meters is 20-30 cm. The invention also provides a method for monitoring the overflow leakage of the deep well of the fractured stratum. A method for monitoring the overflow leakage of a deep well of a fractured stratum is implemented by adopting a device for monitoring the overflow leakage of the deep well of the fractured stratum, and comprises the following steps: the method comprises the following steps that 1, an inlet flow sensor, a pump pressure sensor and an outlet flow sensor are synchronously started, data transmission is carried out on a computer at interva