RU2805699C1 - Cable geophysical tip - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: used in the operation of wells in all operating modes during the development of oil and gas fields. The device includes a housing with a collet clamp, a housing for fixing two layers with two conical bushings, and a tip housing on which geophysical equipment is installed. All housings are connected to each other using metric threads with fine pitch and are fixed with lock washers. The housing with a collet clamp serves as an additional fastening for the tip to fix it on the outer diameter of the cable. Inside the part of the housing protected from the external environment, a strain gauge module is installed to control the carrying out of hoisting operations with the possibility of a hermetically sealed connection to the conductors of a geophysical cable or a geophysical cable with a hydraulic channel. The strain gauge module contains a temperature control sensor installed inside a part of the housing protected from the external environment with the possibility of a sealed connection to the conductors of a geophysical cable or a geophysical cable with a hydraulic channel.

EFFECT: scope of tools is expanding with the ability to ensure the versatility and functionality of the device without loss of quality.

1 cl, 1 dwg

Description

Technical field

The invention relates to the oil and gas industry and can be used in the operation of wells in all operating modes during the development of oil and gas fields.

Cable geophysical tip (KGN-38/60 U) is designed for connecting a rigid geophysical cable in a polymer, fluoroplastic or other synthetic sheath, a flexible steel-polymer pipe (GSPT), a geophysical cable with a hydraulic channel to borehole geophysical equipment and equipment when performing geophysical and hydrodynamic studies obliquely -directional, horizontal wells and wells with a complex profile both in injection and production production of oil and gas condensate wells.

State of the art

A cable lug for an armored geophysical cable is known (RF Patent No. 123 456, publ. December 27, 2012), containing a housing in which an instrument electrical connector and electrical inputs connected to the electrical conductors of the geophysical cable are located, a head made in the form of an elongated cylinder located on the housing and containing inside a geophysical cable sealing unit, fixed in the head using a shear element and configured to move back and forth along the axis of the cable tip. In this case, the termination unit contains a cylindrical support coupling for receiving pushing forces from the side of the geophysical cable, which has coaxial with the axis of the cable tip: a cylindrical cavity for inserting the geophysical cable and a through hole of smaller diameter for current-carrying conductors and layers of armor of the geophysical cable, and a block of cones consisting from a cylindrical body with a conical axial hole and conical bushings with through axial holes, located coaxially one after another inside it, mating with conical surfaces designed to clamp layers of geophysical cable armor together, wherein the support sleeve is connected to the cylindrical body of the cone block with the ability to move along axis of the cable lug and locking in the installed position.

A cable lug for lowering a device into a well is also known (RF Patent No. 106652, published on July 20, 2011), containing upper and lower housings rigidly connected to each other, and a cable fixation unit located in the lower housing. At the same time, it is equipped with an additional collet-type cable fixation unit, located above the main fixation unit and characterized by such a fixation force that allows axial movement of the cable from a load that is at least twice the weight of the device, with the cable between the main and additional fixation units has a tension-free section, the length of which allows for the necessary braking of the cable during its axial movement in the additional fixation unit and transfer of a safe load to the main fixation unit.

In addition, a cable tip is known (RF Patent No. 82761, published on May 10, 2009), containing a housing, a connection unit with a cable, a mechanical and electrical connection unit for the tip with a downhole tool, a mechanism for generating a tension indication signal with a tension-sensitive element, and an external compensator pressure. In this case, the tension-sensitive element is made in the form of a piston, and the mechanism for generating the tension indication signal includes a chamber filled with hydraulic fluid and a pressure sensor, which are connected to each other through a channel made in the piston, and the piston is equipped with sealing zones and, together with the housing forms an external pressure compensator containing a compensation chamber connected to the external environment by a channel in the housing.

Disclosure of the invention

The technical problem with the present invention is the need to increase the versatility of existing equipment without sacrificing quality.

The technical result consists in expanding the arsenal of means for the same purpose.

The invention is illustrated by a drawing: FIG. 1 - tip design.

The cable lug is a combined group of technological and electromechanical solutions that allow solving a wide range of geological and technological problems in wells, for example:

- geophysical surveys of wells with telemetry along current-carrying conductors, a fiber-optic line, a bimetallic line as part of a load-carrying layer of armor of a geophysical cable, a flexible steel-polymer pipe (GSPT), a flexible polymer-reinforced pipe (GPAP), a capillary polymer-metal pipeline (CPMT), in the “ online” and autonomous downhole equipment and equipment with autonomous memory modules and power supply;

- simultaneous carrying out of well logging or hydrodynamic testing in wells with the injection of process fluids, chemical reagents, aerated solutions together with surfactants (surfactants) through a cutting and spraying device included in the design with registration of parameters coming from the connected downhole equipment and equipment on geophysical material recorders located at the wellhead either in specialized GIS/PCS laboratories online, or with autonomous downhole equipment and equipment with autonomous memory modules and power supply;

- supply of process fluids, including those heated to 120 degrees Celsius through the check valve systems, hydraulic monitor and milling nozzles provided in the design along the liner of a flexible steel-polymer pipe (GSPT) or a hydraulic channel of a geophysical cable, KPMT for the elimination of hydrate, paraffin, sand-hydrate and asphaltene plugs and deposits in wells;

- supply of process fluids and chemical reagents through the design of check valve systems, feather-funnel, hydraulic monitor and milling nozzles along the liner of a flexible steel-polymer pipe (GSPT) or a hydraulic channel of a geophysical cable, CPMT or GPAT for processing the bottom-hole zone of the formation in perforation intervals and opened by others the method of technological holes and violations, the implementation of technology for the inflow/injectivity profile of wells, water disposal and waterproofing of violations of the structural elements of the well;

- supply of water-methanol solutions (WMS) with simultaneous registration of parameters of temperature, pressure, density, fluid flow at the wellhead and parameters obtained from downhole geophysical equipment connected to a cable tip at the bottom of the well, the production line in the “online” mode, through the systems provided in the design check valves, hydraulic monitor nozzles and sprayers along the liner of a flexible steel-polymer pipe (GSPT) or a hydraulic channel of a geophysical cable, KPMT for treating the wellbore with VMR to avoid the formation of hydrate, sand-hydrate, paraffin and asphaltene plugs and deposits on the walls of the wellbore and structural elements.

The design of the cable lug provides a reliable connection of rigid geophysical cables and flexible steel-polymer pipes such as GSPT, GPAT, KPMT, with the possibility of sealing two layers of cable armor.

The cable terminal consists of a housing with a collet clamp, a housing 1 for fixing two layers 9 and 10 with two conical bushings 6, and a housing of the terminal 2 on which geophysical equipment is installed. All housings are connected to each other by means of a metric thread with a fine pitch and at the same time they are fixed to each other with lock washers 7, which prevent the parts from spontaneously unwinding. Housing 3 with a collet clamp 4 serves as an additional fastening for the tip, for fixing it on the outer diameter of the cable 5.

A distinctive feature of the claimed technical solution is the presence of a strain gauge module for monitoring the carrying out of tripping operations (TOP) for all of the above types of work, which makes it possible to record all axial loads during the operation of the assembly of downhole instruments or equipment during the passage of extended horizontal or complicated sections where wellhead TPO controls become ineffective informative. The strain gauge module is installed inside a part of the housing protected from the external environment with a sealed connection to the current-carrying cores 8 of the geophysical cable, a geophysical cable with a hydraulic channel for promptly obtaining information from the telemetry system.

The use of a strain-gauge module as part of a cable lug can significantly reduce the risks of emergency situations and incidents during SPO, avoid the occurrence of emergency situations and the consequences of their elimination, such as, for example:

- breakage of the downhole equipment assembly;

- leaving part of the GSPT, geophysical cable with a hydraulic channel, GPAT, CPMT in the well;

- jamming of borehole geophysical equipment, damage to the integrity of the GSPT, geophysical cable with a hydraulic channel, GPAT, CPMT due to exceeding the maximum permissible axial loads during the execution of the PO.

Also, the strain gauge module additionally contains a temperature control sensor, which allows you to record temperature parameters continuously online for the entire duration of the SPO. The temperature sensor is installed inside a part of the housing protected from the external environment with a sealed connection to the current-carrying conductors of the geophysical cable, geophysical cable with a hydraulic channel. The installation position of the sensor in the composite housing for fixing two layers (the sealed part of the fastening of the conductive cores) is determined during manufacturing, taking into account the diameter of the geophysical cable used, the resistance of the conductive cores, and also taking into account the material with which the conductive cores are reinforced (polyethylene, fluoroplastic, etc.). The method of attaching the sensor is a specialized adhesive heat-resistant glue. Temperature control during the production process ensures trouble-free operation of the GSPT, geophysical cable with a hydraulic channel, CPMT, GPAT when performing work related to the supply of process fluids, water-methanol solution (WMS), chemical reagents, as well as technological control of the parameters of well conditions when performing work to eliminate hydrate , paraffin, sand-hydrate and asphaltene deposits, monitoring the operating parameters of borehole geophysical equipment in wells with abnormally high formation temperatures, abnormally low temperatures in wells in the Arctic zone of the Yamalo-Nenets Autonomous Okrug.

The versatility of combined modifications of the cable lug is ensured by the interchangeability of units, mechanisms and parts, as well as a unified standard of threaded connections and joints.

Example of practical implementation

The cable lug (KGN-38/60 U) was successfully tested at the facilities of NOVATEK - YURKHAROVNEFTEGAZ LLC, NOVATEK - PUROVSKY ZPK LLC, GAZPROM DOBYCHA KUZNETSK LLC in 2022. At the facilities of GAZPROMNEFT - NOYABRSKNEFTEGAZ LLC, a modification (KGN-38/60 U) is successfully used in replication to perform work on the elimination of hydrate and paraffin deposits (VC - circulation restoration) together with a flexible steel-polymer pipe (GSPT) and a geophysical cable with a hydraulic channel.

The technical result of the application in the KGN-38/60 U configuration is due to the integrated solution of technological and geological problems online when carrying out downhole work in wells with an extended horizontal end and a complex profile, where without the use of KGN-38/60 control tools are installed at the wellhead , technological and power winches are uninformative or do not allow prompt operational decisions to be made in the process of performing work.

Claims (1)

A cable terminal consisting of a housing with a collet clamp, a housing for fixing two layers with two conical bushings and a housing of the terminal on which geophysical equipment is installed, all housings are interconnected by means of a metric thread with a fine pitch and are fixed with lock washers, while the housing with a collet clamp serves as an additional fastening of the tip for its fixation on the outer diameter of the cable, characterized in that it contains a strain gauge module for monitoring the carrying out of hoisting operations, installed inside a part of the housing protected from the external environment with the possibility of a sealed connection to the conductive cores of a geophysical cable or a geophysical cable with a hydraulic channel, in addition a strain gauge the module additionally contains a temperature control sensor, also installed inside a part of the housing protected from the external environment with the possibility of a sealed connection to the conductors of a geophysical cable or a geophysical cable with a hydraulic channel.