RU2388902C1 - Operation method of well equipped with bottom-hole pump - Google Patents

Abstract

FIELD: oil and gas industry. ^ SUBSTANCE: operation method of the well involves lowering of tubing string to the well, at the lower end of which there installed is bottom-hole device equipped with a pulley which is enveloped with a rope; strings of rods, bottom-hole pump, and their operation. Bottom-hole device is lowered together with tubing by means of rope the free end of which is fixed on the well head. In order to carry out measurements, to the first end of rope there attached is a cable end with cable, and it is lowered to mechanical and electric connection to bottom-hole device. Measurements of liquid parametres in the well and transfer of data via the cable to surface is performed when bottom-hole device is lowered to the well below tubing. After measurements are completed, rope and cable is wound up and bottom-hole device is raised till it is borne against lower end of tubing string, and connection of cable end to bottom-hole device is detached, and cable is wound up till there is next lowering of bottom-hole device. ^ EFFECT: safety and reduction of labour input of lowering of independent bottom-hole device to the well. ^ 2 dwg

Description

The invention relates to the oil industry and may find application in the operation of a well equipped with a sucker rod pump.

A known method of lowering the device into the well, including equipping the well with a rod pump, lowering the liner and tubing into the well and passing the device through the annulus (RF patent No. 2029079, published on 02.20.1995).

The disadvantages of the method are the difficulties associated with the descent of equipment into the well, the low reliability of its installation in the well, the complexity. Shank often breaks during the descent process itself, and, therefore, in such cases, the shank cannot fulfill the function of preventing the formation of cable loops.

Closest to the proposed method in technical essence is a method of safely lowering a downhole tool into a well, including lowering into a casing of a downhole tool in a liner with a plugged end, a pipe with a slotted tap, a filter, a geophysical cable through a slotted tap of a pipe, a tubing string, downhole sucker rod pump, rod string (RF patent No. 2250991, published. 2005.04.27 - prototype).

The known method involves the permanent placement of the cable in the well and the use of a permanently connected downhole tool.

The proposed invention solves the problem of using an autonomous deep-sea device, descent and connecting a cable to it.

The problem is solved in that in the method of operating a well equipped with a sucker rod pump, including a descent into the well of a downhole tool, tubing string, sucker rod pump, sucker string, operation of a sucker rod pump and a depth tool, according to the invention, when lowering the equipment at the wellhead wells at the lower end of the tubing string install a downhole tool equipped with a pulley, the pulley is covered with a rope, the first end of the rope is fixed to the wellhead, lower they string the tubing string and simultaneously unwind the second end of the rope and lower the depth tool on the pulley, after lowering, release the first end of the rope and attach the cable lug to the cable to it, unwind the second end of the rope, and unwind the cable until the cable lug is mechanically and electrically connected to with a deep tool, the connection is fixed, with a fixed string of tubing, the rope and cable simultaneously unwind and lower the deep tool in the well, measure a meter of fluid in the well and transferring information by cable to the surface, wind up the rope and cable and lift the depth device all the way to the lower end of the tubing string, disconnect the connection between the cable lug and the depth tool, wind the cable and unwind the cable until the cable lug appears on the mouth wells, remove the cable with the cable lug and the first end of the rope from the well, disconnect the first end of the rope from the cable lug and secure it to the wellhead until the next descent Ubin device.

SUMMARY OF THE INVENTION

The operation of wells equipped with a sucker rod pump is complicated by the presence of a constantly present cable in the case of using a stationary downhole tool or in the absence of periodic information in the case of using an autonomous downhole tool.

For registration of physical quantities, such as pressure and pressure increment, the presence and speed of fluid movement in the wellbore, depth devices are used, where the conversion of the measured value is carried out in a depth device, and registration is performed using secondary equipment installed on the surface. The descent of the deep device into the well and the transmission of information to the surface is carried out using a cable. The cable when working with deep instruments is at the same time a communication channel between the deep instrument and secondary equipment. Over time, the geophysical cable under conditions of the borehole environment corrodes, becomes unusable and breaks. This occurs as a result of friction of the geophysical cable against the pipe string during the descent and ascent of the downhole tool, as well as in deviated wells due to the influence of the well curvature, where the geophysical cable wraps the pipe string during lifting, as a result of which tightening occurs. To retrieve the downhole tool from the bottom of the well, labor-intensive fishing operations are carried out during the overhaul of the wells.

The proposed method solves the problem of using an autonomous deep-sea device, lowering and connecting a cable to it to remove information and charge the battery without lifting the device to the surface. The problem is solved as follows.

When lowering the equipment at the wellhead, at the lower end of the tubing string, a downhole tool equipped with a pulley is installed. The pulley is covered with a rope (cable). The first end of the rope is fixed at the wellhead. The downhole tool and the tubing string are lowered and at the same time the second end of the rope is unwound. Thus, the downhole tool is lowered on a pulley. Lower the deep pump and the rod string. Perform the operation of a submersible pump.

After the descent, the first end of the rope is released and a cable lug connected to the cable is attached to it. The other end of the rope is unwound, and the cable is unwound, moving the cable lug to the mechanical and electrical connection of the cable lug to the depth tool. The connection is fixed, for example, with an electromagnetic shutter controlled from the cable core. When the tubing string is stationary, the rope and cable simultaneously unwind and lower the downhole tool into the well, measure fluid parameters in the well and transmit information through the cable to the surface, wind up the rope and cable and lift the downhole tool all the way to the lower end of the tubing string pipes. The connection of the cable lug and the depth tool is disconnected. Wrap the rope and cable and lift the depth device to the bottom end of the tubing string. The connection of the cable lug and the depth tool is disconnected. Unwind the cable and unwind the rope until the cable lug appears at the wellhead, remove the cable with the cable lug and the first end of the rope from the well, disconnect the first end of the rope from the cable lug and secure it to the wellhead until the next descent of the downhole tool.

Figure 1 shows a variant of the device for implementing a method of operating a well equipped with a rod deep pump, figure 2 shows a device with a docked cable lug and a socket for a cable lug.

The device includes a tubing string 1, a downhole tool 2, a fixing screw 3, a winch with a drum 4 and a rope (or cable) 5, a pulley 6, a wellhead 7 armature, a cable 8, a clamp 9, a cable lug 10. In the device body 2, holes A and B are made, passing into the cavity 11, in which the pulley 6 is placed. In the hole B there is a socket for a cable lug 12. A sucker rod pump and a rod string (not shown) are placed in the tubing string 1 above the device. The cable 8 is connected to ground equipment (not shown), which allows you to control the operation of the depth device 2 and to read and convert information from the depth device 2.

The device operates as follows.

Before lowering the tubing string 1 into the well, a downhole device 2 is installed at the lower end of the tubing string and pre-fixed with screw 3. Then, rope 5 is wound from drum 4 of the winch and, passing its end through holes A and B and grasping a pulley 6, located in the cavity 11, is attached to the reinforcement of the wellhead 7 (for example, to an eye attached to the casing flange).

The screw 3 is completely unscrewed and removed from the socket. The tubing string 1 and the depth tool 2 are lowered to the required depth.

When descending into the well of the tubing string 1 with its downhole tool 2 installed below, the rope 5 is run through holes A and B and into the cavity 11 and around the pulley 6. One end of the rope 5 is attached to the reinforcement of the wellhead 7, the second is wound on the winch drum 4. The depth tool 2 is pressed against the bottom of the tubing string 1.

After the descent of the tubing string 1 to the end of the rope 5, previously attached to the reinforcement 7, connect the cable 8 using the cable lug 10. The second end of the rope 5 is wound on the winch drum 4, and the cable 8 is unwound until mechanical and the electrical connection in the hole B of the cable lug 10 with a socket under the cable lug 12 of the depth tool 2. To avoid disconnection, fix the connection with the latch 9. The depth tool 2 is lowered into the well, for which the winch drum under rotazhny cable (not shown) under the rope 4 and gradually released from the brakes, providing simultaneous lowering cable 8 and the rope 5 in the well under the weight of the downhole instrument 2.

The cable lug 10 is held by the latch 9, which ensures a rigid connection with the deep tool 2 at the moment of its full entry into the hole B. The latch 9 is made in the form of an electromagnetic latch exhibiting magnetic properties due to the supply of electrical energy from the cable core 8. To disconnect the deep device 2 from the cable lug 10 before removing the cable 8 from the well de-energize the lock solenoid 9.

After connecting the cable 8 with the downhole tool 2, research is carried out by descent to the study intervals and dragging the device 2 along the wellbore. To do this, produce coordinated descents and ascents using both winches (cable and cable). Information is transmitted to the surface via cable 8.

After completion of the research, the deep device 2 is lifted up to the stop in the bottom of the tubing string 1 using both winches, after which the cable 8 is removed from the well. To do this, a corresponding electrical signal is supplied via cable 8, the latch 9 is disconnected, and cable 8 with a cable lug is removed from the well with the help of a logging winch. At the same time, winch 3 under cable 5 in low braking mode provides a slight tightness of cable 5.

After the cable lug 10 reaches the surface, the free end of the cable 5 is disconnected from the cable lug 10 and connected to the wellhead reinforcement until the next well exploration cycle.

It is possible to lower and lower the downhole tool both during operation and during stops of operation of the sucker rod pump.

Concrete example

When lowering the equipment at the mouth of an oil well at the lower end of the 2.5 '' tubing string, a downhole tool equipped with a pulley is installed. The pulley cover the rope. The first end of the rope is fixed at the wellhead. The depth device and the tubing string are lowered to a depth of 1300 m and at the same time the second end of the rope is unwound. Lower the deep pump and the rod string. Perform the operation of a submersible pump.

After the descent, the first end of the rope is released and a cable lug connected to it with a cable KG 1-28-130 is attached to it. The other end of the rope is unwound, and the cable is unwound, moving the cable lug to the mechanical and electrical connection of the cable lug to the depth tool. The connection is fixed. When the tubing string is stationary, the rope and cable simultaneously unwind and lower the downhole tool into the well, measure fluid parameters in the well, transmit information through the cable to the surface, wind up the rope and cable and lift the downhole tool all the way into the lower section of the tubing string pipes. The connection of the cable lug and the depth tool is disconnected. The cable is unwound and the cable is unwound until a cable lug appears at the wellhead, the cable with the cable lug is removed from the well, the first end of the cable is disconnected from the cable lug and secured to the wellhead until the next descent of the downhole tool.

The application of the proposed device will allow us to solve the problem of using an autonomous deep-well tool, launching and connecting a cable to it during the operation of a well equipped with a rod deep pump.

Claims (1)

A method of operating a well equipped with a sucker rod pump, which includes a downhole tool, a tubing string, a sucker rod string, a rod string, operating a sucker rod pump and a suction tool, characterized in that when lowering the equipment at the wellhead at the lower end tubing columns install a downhole tool equipped with a pulley, the pulley is covered with a rope, the first end of the rope is fixed at the wellhead, the tubing string is lowered quarrel pipes and simultaneously unwind the second end of the rope and lower the depth tool on the pulley, after lowering, release the first end of the rope and attach the cable lug to the cable, the second end of the rope is unwound, and the cable is unwound until the cable lug is mechanically and electrically connected to the depth device, connection fix, with a fixed tubing string, the rope and cable simultaneously unwind and lower the downhole tool into the well, measure fluid parameters in the wells e and information transfer by cable to the surface, wind up the cable and cable and lift the depth tool all the way to the lower end of the tubing string, disconnect the cable lug and depth tool connection, wind the cable and unwind the cable until the cable lug appears at the wellhead, remove cable with a cable lug and the first end of the rope from the well, disconnect the first end of the rope from the cable lug and fasten to the wellhead until the next descent of the downhole tool.

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