CN-121993097-A - Fracturing sliding sleeve for production tracking

CN121993097ACN 121993097 ACN121993097 ACN 121993097ACN-121993097-A

Abstract

The invention relates to the technical field of oil and gas yield increase, in particular to a fracturing sliding sleeve for production tracking, and aims to solve the technical problem that a tracking material is easily washed out due to exposure in a construction channel in the related art, so that a tracking effect cannot be achieved in the production process. The fracturing sliding sleeve for production tracking comprises a tracking mechanism, wherein the tracking mechanism comprises an upper joint, a central tube and a communicating sleeve. The communicating sleeve is sleeved on the central tube and is inserted into the upper joint. The central tube is provided with an overflow channel and an overflow hole, and the communication sleeve is provided with a production channel. The upper joint is provided with a liquid inlet. The fracturing sliding sleeve for production tracking is characterized in that a tracer is arranged in a production channel which can be switched between connection and disconnection with a liquid inlet hole and an overflow hole, and the production channel and the overflow channel are communicated by matching with the sliding of a communicating sleeve. The technical problem that the existing fracturing sliding sleeve for production tracking is easy to wash away due to the fact that the tracking material is exposed in a construction channel, so that the tracking effect cannot be achieved in the production process is solved.

Inventors

ZHANG PENG
CUI ZHENMAO
JIAO XIU
PAN HUIYU
LUO JINYU
WU JIE
QIN SHITAO
SUN XIAOFEI
CHENG ZHIYUAN
YANG XIAOYONG

Assignees

中国石油集团渤海钻探工程有限公司
中国石油天然气集团有限公司

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (10)

1. A fracturing sliding sleeve for production tracking, comprising: The tracing mechanism comprises an upper joint, a central pipe and a communication sleeve, wherein the communication sleeve is sleeved on the central pipe and is inserted into the upper joint, the central pipe is provided with an overflow channel and an overflow hole which is arranged on the side wall of the central pipe and is communicated with the overflow channel, a production channel is arranged on the communication sleeve and is used for containing a tracer agent, a liquid inlet is formed in the side wall of the upper joint, and the communication sleeve can slide along the axis of the communication sleeve so that the liquid inlet and the overflow hole are switched from a cut-off state to a communication state with the production channel.
2. The fracturing slide for production tracking of claim 1, wherein: the device comprises a central tube, a liquid inlet, a production passage, a production hole, a central tube, a delay unlocking mechanism, a locking sleeve and a fixing nail, wherein the delay unlocking mechanism comprises a locking sleeve and the fixing nail, the locking sleeve is arranged on the communication sleeve and sleeved on the central tube, the locking sleeve is locked with the central tube through the fixing nail so as to limit the axial position of the communication sleeve, the liquid inlet, the production passage and the overflow hole are kept in a cut-off state, and the fixing nail is made of a soluble material.
3. The fracturing slide for production tracking of claim 2, wherein: the delay unlocking mechanism further comprises a baffle ring and a spring, wherein the baffle ring is sleeved on the central tube and inserted into the closing sleeve, and two ends of the spring are respectively abutted against the closing sleeve and the baffle ring so as to apply thrust to the closing sleeve, thereby driving the communication sleeve to slide in a direction away from the upper joint.
4. A frac slide for production tracking as claimed in claim 3, wherein: The time delay unlocking mechanism further comprises a clamping ring, a groove is formed in the periphery of the blocking ring, the clamping ring is an elastic piece, the free outer diameter of the clamping ring is larger than that of the clamping ring, the clamping ring is clamped in the groove and abuts against the inner wall of the closing sleeve, a positioning groove is formed in the inner wall of the closing sleeve, the positioning groove is formed between the communicating sleeve and the blocking ring, and the closing sleeve can slide in the direction away from the upper joint so that the clamping ring is clamped in the positioning groove.
5. The fracturing slide for production tracking of claim 2, wherein: The fracturing starting mechanism comprises a starting sliding sleeve, the starting sliding sleeve is sleeved on the central tube and the closing sleeve at the same time, the central tube is further provided with a pressure discharging hole, the starting sliding sleeve isolates the pressure discharging hole and the fixing nail from a stratum in an initial state, and the starting sliding sleeve can slide along the axis direction of the central tube to release the isolation state between the pressure discharging hole and the fixing nail and the stratum.
6. The fracturing slide for production tracking of claim 5, wherein: The fracturing starting mechanism further comprises a fixing ring and a starting shear pin, wherein the fixing ring is arranged at one end, far away from the closing sleeve, of the starting sliding sleeve and sleeved on the central tube, the starting sliding sleeve is locked with the fixing ring through the starting shear pin when the pressure is not over a threshold value, and the starting shear pin is sheared when the pressure is over the threshold value, so that the starting sliding sleeve and the closing sleeve are separated from a locking state.
7. The fracturing slide for production tracking of claim 6, wherein: The starting sliding sleeve, the central tube and the closing sleeve are enclosed to form a first pressure cavity, the pressure discharging hole is communicated with the first pressure cavity, the pressure difference of the first pressure cavity is used for applying thrust to the starting sliding sleeve, when the starting sliding sleeve is pressed to exceed a threshold value, the starting shear pins are sheared, and the starting sliding sleeve is separated from a locking state.
8. The fracturing slide for production tracking of claim 7, wherein: The central tube is further provided with a balance hole, the starting sliding sleeve, the central tube and the fixing ring form a second pressure cavity in a surrounding mode, the balance hole is communicated with the second pressure cavity, the pressure difference between the first pressure cavity and the second pressure cavity is used for applying thrust to the starting sliding sleeve, when the starting sliding sleeve is pressed to exceed a threshold value, the starting shear pins are sheared, and the starting sliding sleeve is separated from a locking state.
9. The fracturing slide for production tracking of claim 8, wherein: The fracturing starting mechanism further comprises a ball seat and a construction ball, wherein the ball seat is connected to the inner wall of the central tube and is positioned between the pressure discharging hole and the balance hole, when the construction ball is seated on the ball seat, the pressure of the first pressure cavity is increased, the pressure of the first pressure cavity is larger than that of the second pressure cavity, and the pressure difference between the first pressure cavity and the second pressure cavity is used for applying thrust to the starting sliding sleeve so as to drive the starting sliding sleeve to cut off the starting shear pins and abut against the fixed ring, so that the pressure discharging hole and the fixed pins are exposed in the stratum.
10. The fracturing slide for production tracking of claim 9, wherein: the construction ball is made of soluble materials.

Description

Fracturing sliding sleeve for production tracking Technical Field The invention relates to the technical field of oil and gas yield increase, in particular to a fracturing sliding sleeve for production tracking. Background After an oil and gas well is rebuilt, tracer materials and rebuilding liquids are typically injected into the construction interval in order to monitor the production of each rebuilt horizon. These tracer materials are returned to the surface with the oil and gas, and the production of each interval is assessed by analyzing the proportions of the different types of tracer materials. However, the tracer material is affected in the formation by frac sand plugging and hydrocarbon flowback in the reservoir fracture, resulting in reduced accuracy in production monitoring. Attaching tracer materials to the production passage of the fracturing sleeve is the best way to monitor the interval. However, the production channel of the conventional starting sliding sleeve is also used as a construction channel in the construction process, and the attached tracer material is easy to wash away and cannot play a role in production. The existing fracturing sliding sleeve for production tracking has the technical problem that the tracer material is easily washed away due to exposure in a construction channel, so that the tracer effect cannot be achieved in the production process. Disclosure of Invention The invention aims to provide a fracturing sliding sleeve for production tracking, which solves the technical problem that in the related art, a tracking material is easily washed away due to exposure in a construction channel, so that the tracking effect cannot be achieved in the production process. In order to solve the technical problems, the technical scheme provided by the invention is as follows: the fracturing sliding sleeve for production tracking provided by the invention comprises the following components: The tracing mechanism comprises an upper joint, a central tube and a communicating sleeve. The communication sleeve is sleeved on the central tube and inserted into the upper joint. The central tube is provided with an overflow channel and an overflow hole arranged on the side wall of the central tube and communicated with the overflow channel, and a production channel is arranged on the communication sleeve and used for accommodating the tracer. The side wall of the upper joint is provided with a liquid inlet. The communicating sleeve can slide along the axis of the communicating sleeve so that the liquid inlet and the overflow hole and the production channel are switched from a cut-off state to a communicating state. Specifically, the shunt tube string comprises an upper joint and a central tube, and the central tube is sleeved with the communication sleeve and inserted into the upper joint. The inner hole of the central tube is set as a flow passage, the side wall of the central tube is provided with a flow passage hole, and the upper joint is provided with a liquid inlet hole. In the initial state, the liquid inlet, the production channel and the overflow hole are not communicated. The communicating sleeve can slide along the central tube in a direction away from the upper joint, so that the liquid inlet, the production channel, the overflow hole and the overflow channel are communicated. Specifically, the device also comprises a delay unlocking mechanism, wherein the delay unlocking mechanism comprises a closing sleeve and a fixing nail. The closing sleeve is arranged on the communicating sleeve and sleeved on the central pipe. The closing sleeve is locked with the central tube through the fixing nails so as to limit the axial position of the communicating sleeve, so that the liquid inlet, the production channel and the overflow hole are kept in a cut-off state. The fixing nails are made of soluble materials. Specifically, the delay unlocking mechanism further comprises a baffle ring and a spring. The baffle ring is sleeved on the central pipe and inserted into the closing sleeve, and two ends of the spring are respectively abutted to the closing sleeve and the baffle ring so as to apply thrust to the closing sleeve, thereby driving the communication sleeve to slide in a direction away from the upper joint. Specifically, the time delay unlocking mechanism further comprises a clamping ring, and the periphery of the blocking ring is provided with a groove. The snap ring is arranged to be an elastic piece, and the free outer diameter size of the snap ring is larger than the outer diameter size of the snap ring. The clamping ring is clamped in the groove and abutted against the inner wall of the closing sleeve. The inner wall of the closing sleeve is provided with a positioning groove, and the positioning groove is arranged between the communication sleeve and the baffle ring. The closing sleeve can slide in the direction away from the upper joint so that the clamping ring is clamped in the posi