RU-2861312-C1 - SWITCHABLE INTELLIGENT SLIDING SLEEVE SYSTEM FOR HYDRAULIC FRACTURING BASED ON INTELLIGENT MARKING AND CONTROLLED BY COILED TUBING, AND HYDRAULIC FRACTURING METHOD

RU2861312C1RU 2861312 C1RU2861312 C1RU 2861312C1RU-2861312-C1

Abstract

FIELD: oil and gas industry. SUBSTANCE: invention relates to the technical field of oil and gas exploration and production, in particular to a switchable intelligent sliding sleeve system for hydraulic fracturing based on intelligent marking and controlled by coiled tubing. The method for hydraulic fracturing includes that it uses a switchable intelligent sliding sleeve system for hydraulic fracturing based on intelligent marking and controlled by coiled tubing. It also includes the following steps: during the first use of the intelligent sliding sleeve for hydraulic fracturing, marking of the intelligent key with the first switching for the intelligent hydraulic fracturing sleeve is used. When blocking water, an intelligent switching tool is used to open and close the intelligent sliding sleeve for hydraulic fracturing. EFFECT: increased hydraulic fracturing efficiency. 7 cl, 18 dwg

Inventors

WENPING SONG

Dates

Publication Date: 20260504
Application Date: 20250401
Priority Date: 20240514

Claims (7)

1. A switchable intelligent sliding sleeve system for hydraulic fracturing based on intelligent marking and controlled by coiled tubing, characterized in that it comprises an intelligent switching tool, an intelligent key marking for the first activation of the intelligent sliding sleeve for hydraulic fracturing and a lowered casing string, wherein the intelligent switching tool comprises an oil pipe connecting element, a first electronic control cavity removably connected to the lower end of the oil pipe connecting element, a connecting element removably connected to the lower end of the first electronic control cavity, a clamp protective part removably connected to the lower end of the connecting element, the lower end of the clamp protective part removably connected to the guide element, wherein an empty cavity is formed between the oil pipe connecting element, the first electronic control cavity and the connecting element, an electric motor located in the empty cavity and an electronic control system are firmly connected on the first electronic control cavity, which controls the electric motor, a screw rod is firmly connected to the output shaft of the electric motor, the screw rod is rotationally connected in the connecting element, a sealing sleeve is firmly connected to the lower end of the sealing sleeve of the screw rod, and a transmission lever with a screw transmission is located on the screw rod, a keyway is provided on the inner wall of the sealing sleeve in the axial direction, a button is firmly connected to the transmission lever, which is placed in the keyway, the first end cover is connected at the lower end of the transmission lever by means of a thread, a mounting body of the clamp is firmly connected to the upper end of the first end cover, and a clamp is provided on the upper side of the mounting body of the clamp, the mounting body of the clamp, when moving upward, is configured to expand the clamp and move in the axial direction away from the support screw rod, and the marking of the intelligent key for the first activation of the intelligent sliding coupling for hydraulic fracturing contains a second electronic control cavity with an opening on at the upper end, in the second electronic control cavity an actuator is firmly connected, the lower part of the second electronic control cavity is movably connected to the first seal, the actuator is used to adjust the pitch between the first seal and the second electronic control cavity, a sealing part is provided between the first seal and the second electronic control cavity, at the lower end of the sealing part a wedge surface of the first internal opening is provided, at the upper end of the first seal a first projection is provided which matches the wedge surface of the first internal opening, the sealing part is configured to move in the radial direction relative to the first seal, in the inner circumference of the sealing part a wedge surface of the second internal opening is provided, in the outer circumference of the second electronic control cavity a first wedge surface is provided, the interaxial distance from the first wedge surface to the second electronic control cavity increases from bottom to top, so that when the sealing part moves upward along the first wedge surface, the sealing part is compressed by the first wedge surface, the diameter of the sealing part expands, when the sealing part moves downward along the first wedge surface, the diameter of the sealing part decreases, wherein a seal channel is provided on the first seal, in a second electronic control cavity is firmly connected to a tube for passing liquid, a channel of the electronic control cavity is provided in the second electronic control cavity, a second end cover is detachably connected to the upper end of the second electronic control cavity, a channel for the end cover is provided on the second end cover, the second electronic control cavity and the second end cover are firmly connected to the central tube, the gland channel, the tube for passing liquid, the channel of the electronic control cavity, the central tube and the channel of the end cover communicate with each other, forming a channel for the reverse discharge, and a burst ball is provided in the channel of the end cover for blocking the channel for the reverse discharge, and the upper part of the second end cover is connected by a threaded connection with the second gland, the burst ball and the second gland form a sealing cavity in the channel of the end cover, wherein the lowered casing string contains a marking branch pipe and an intelligent sliding sleeve for hydraulic fracturing, the marking branch pipe contains an upper connector of the branch pipe, the lower end of the upper The nozzle connector is detachably connected to the lower nozzle connector, a groove for installing the first marking ring is provided on the outer circumference of the upper part of the lower nozzle connector, the first marking ring is firmly connected in the groove for installing the first marking ring, the marking nozzle and the intelligent sliding coupling for hydraulic fracturing are connected using a sleeve.
2. The system according to claim 1, characterized in that the clamp comprises a clamp body, on the clamp body there are two guide grooves that are mirror-symmetrical and extend in the radial direction, and the lower end of the clamp protective part is firmly connected to a guide block that matches the first guide groove, the clamp body is designed to slide in the radial direction along the clamp protective part, wherein a second wedge surface is formed at the inner end of the clamp body, the step between the second wedge surface and the axial line of the screw rod increases from top to bottom, the inner end of the clamp body is firmly connected to a convex strip that extends along the second wedge surface, on the outer circumference of the clamp mounting body there is a third wedge surface that extends along the second wedge surface, the step between the third wedge surface and the axial line of the screw rod increases from top to bottom, on the clamp mounting body there is a second guide groove that extends along the third wedge surface, the convex strip is placed on the second guide groove.
3. The system according to claim 1, characterized in that a signal detection system located in an empty cavity is firmly connected to the first electronic control cavity.
4. The system according to paragraph 1, characterized in that a first mounting hole is provided inside the second electronic control cavity, and an induction device is provided in the first mounting hole.
5. The system according to claim 1, characterized in that the intelligent sliding sleeve for hydraulic fracturing comprises an upper connector of the sliding sleeve, an opening for passage is provided on the upper connector of the sliding sleeve, an inner core of the sliding sleeve is inserted into the upper connector of the sliding sleeve, on the outer wall of the inner core of the sliding sleeve there is a diameter reduction section, on the outer wall of the inner core of the sliding sleeve there are two grooves of the inner core, which are located on the upper and lower sides of the diameter reduction section, the inner core of the sliding sleeve is configured to slide in the upper connector of the sliding sleeve, there is a diameter reduction section on the upper side of the inner wall of the upper connector of the sliding sleeve to form a shoulder of the upper connector of the sliding sleeve, the shoulder of the upper connector is configured to prevent the inner core of the sliding sleeve from moving further upward, a lower connector of the sliding sleeve is provided at the lower end of the upper connector of the sliding sleeve, on the outer wall of the lower The sliding coupling connector is provided with a mounting groove for the second marking ring, in which the second marking ring is firmly connected, the inner wall at the lower end of the upper sliding coupling connector is connected to the lower sliding coupling connector, the second marking ring is located between the upper sliding coupling connector and the lower sliding coupling connector.
6. The system according to claim 1, characterized in that when used for switching one target intelligent sliding sleeve for hydraulic fracturing, a battery-powered self-identification switch control system is used, which comprises a serial communication circuit, an induction module, a first microcontroller, a first status display circuit, a power supply circuit, a first driver circuit and a first actuator, wherein, when it is necessary to turn on or off the multi-layer intelligent sliding sleeve for hydraulic fracturing, a control system for turning on and off the power and communication of the integrated coiled tubing cable is used, which comprises a ground carrier controller and an intelligent switching tool circuit, the ground carrier controller comprises an industrial computer, a second microcontroller, a first carrier communication circuit, a carrier power supply circuit and a carrier communication cable, wherein the intelligent switching tool circuit comprises a second carrier communication circuit, an induction unit and a third microcontroller, a second status display circuit, a carrier power supply circuit, a second driver circuit and a second actuator.
7. A method for hydraulic fracturing, characterized in that it uses a switchable intelligent sliding sleeve system for hydraulic fracturing based on an intelligent marking and controlled by coiled tubing, according to paragraph 5 or 6, includes the following steps: when the intelligent sliding sleeve for hydraulic fracturing is first used, the marking of the intelligent key with the first turn on for the intelligent sleeve for hydraulic fracturing is used, when water is blocked, the intelligent switching tool is used to open and close the intelligent sliding sleeve for hydraulic fracturing.

Description

Field of technology The invention relates to the technical field of oil and gas exploration and development, in particular to a switchable intelligent sliding sleeve system for hydraulic fracturing, based on intelligent marking and controlled by coiled tubing. State of the art For the development of formations with hydraulic fracturing in low-permeability reservoirs, in order to further improve the development effect, on the one hand, it is necessary to carry out intensive and uniform formation-forming fracturing in the horizontal section, to maximize the productivity of one well, on the other hand, it is necessary to perform plugging, regulation and control of the aquifer at a late stage and control the repeated on-off control after processing the productive formation, so as to ensure controlled transformation and development throughout the life cycle of oil and gas wells. To solve the above problems, due to the inherent shortcomings of traditional hydraulic fracturing technology, there are significant limitations in improving it. For example, document CN201710580590.3 indicates that the use of a preset full-diameter sliding sleeve and an electronic sliding sleeve on/off control tool, cable descent into the sliding sleeve on/off system, and the use of an acoustic wave locator and an electronic sliding sleeve on/off control tool can achieve any level of segmented fracturing and water control. However, the intelligence of these functions is still insufficient. As an advanced technology, a hydraulic fracturing system based on intelligent tagging (intelligent key tagging) has more advantages than traditional hydraulic fracturing technology and offers great room for improvement. Disclosure of invention - presence of structural elements; - characteristics of the element and their relationship. The objective of the claimed invention is to improve operational characteristics. The technical result is the endless, efficient and accurate transformation of hydraulic fracturing in unconventional oil and gas wells, avoiding mechanical water plugging and chemical water action during the production formation plugging operation in the late stage of production, using a pre-configured well completion string of a switchable intelligent sliding sleeve for hydraulic fracturing and an intelligent coiled tubing switching tool, performing multiple control of the production formation, and significantly improving the flexibility of reservoir regulation and control from the initial development to the later stage of stable control of oil and water content. The essence of the invention lies in the fact that a switchable intelligent system of a sliding sleeve for hydraulic fracturing, based on intelligent marking and controlled by coiled tubing, contains an intelligent switching tool, marking of an intelligent key for the first activation of an intelligent sliding sleeve for hydraulic fracturing and a lowered string of casing pipes, wherein the intelligent switching tool contains a connecting element of an oil pipe, a first electronic control cavity, removably connected to the lower end of the connecting element of the oil pipe, a connecting element, removably connected to the lower end of the first electronic control cavity, a protective part of the clamp, removably connected to the lower end of the connecting element, the lower end of the protective part of the clamp, removably connected to the guide element, wherein an empty cavity is formed between the connecting element of the oil pipe, the first electronic control cavity and the connecting element, an electric motor located in the empty cavity and an electronic system are firmly connected on the first electronic control cavity a control that controls an electric motor, a screw rod is firmly connected to the output shaft of the electric motor, the screw rod is rotationally connected in a connecting element, a sealing sleeve is firmly connected to the lower end of the sealing sleeve of the screw rod, and a transmission lever with a screw transmission is located on the screw rod, a keyway is provided on the inner wall of the sealing sleeve in the axial direction, a button is firmly connected to the transmission lever, which is placed in the keyway, a first end cover is connected at the lower end of the transmission lever by means of a thread, a clamp mounting body is firmly connected to the upper end of the first end cover, and a clamp is provided on the upper side of the clamp mounting body, and when the clamp mounting body moves upward, it can expand the clamp and move in the axial direction away from the support screw rod, wherein the marking of the intelligent key for the first activation of the intelligent sliding sleeve for hydraulic fracturing comprises a second electronic control cavity with an opening at the upper end, a drive is firmly connected in the second electronic control cavity, the lower part of the second electronic control cavity is movably connected to the first