RU2267598C2 - Composite sucker rod socket - Google Patents

Abstract

FIELD: oil production industry, particularly catching tools used for oil well repair.

SUBSTANCE: sucker rod socket comprises body having conical surface and connected with head in upper part thereof, sucker rod gripper, thrust and bearing ledges formed in rod head and bell guide. The gripper is made as two replaceable slip dies sliding over conical body surface and adapted to be used with sucker rods having diameters of 25, 22 and 19 mm. Bell guide define inner conical surface along with body to provide movement of torn or unscrewed upper rod end from productive string column and to align thereof. Tubing strings for socket lowering are connected to socket head. The rod socket is designed in accordance with production string diameter and permits passage of sucker rods stuck in tubing string, which is secured in production string through rod socket interior.

EFFECT: increased reliability and load-carrying capacity.

5 dwg

Description

The invention relates to the oil industry, in particular to fishing tools used in the repair of oil wells, and is used to retrieve fallen or torn tubing / tubing / with sucker rods to the bottom of the well, while the torn or turned off rods are located above the column Tubing.

A plunger-type rod catcher is known for catching bent or torn but not stuck pump rods inside tubing, and comprising a housing with a through channel, an eccentric translator for connection to a working string, a gripping element made in the form of a two-horn fork mounted in axis housing (Catcher type LSHPM2 / models LSHPM2-73 and LSHPM2-89 / Amirov AD and others. "Reference book on the current and overhaul of oil wells", - M .: Nedra, 1979). The catcher is manufactured according to TU 3668-004-00217567-99 at the Ishimbay Machine-Building Plant OJSC in the Republic of Bashkortostan / address: 453204, Republic of Bashkortostan, Ishimbay, ul. B. Khmelnitsky, 2 /.

In an accident / flight / tubing with sucker rods in oil wells, the lower part of the tubing after hitting the artificial bottom of the well turns into a “pasta spiral”, while tubing with sucker rods in the production string and sucker rods inside the tubing string are jammed. Therefore, when lifting this wedged tubing string with sucker rods, loads of up to 30 tons or more arise.

Above the tubing for this type of accident, as a rule, there are pump rods with a diameter of 25 or 22 mm.

Work on the extraction of jammed tubing with rods is carried out in the space of the production string.

Known rod catcher universal LHU designed for rod fishing in a string of tubing with a grip / stop / for threaded connection elements - a clutch, thrust and support collars on the rod head / LHU models 73-22-16 and LShU 60-19-16 /. The catcher consists of a hollow body with a grip, a half-bar with a connecting thread Ш19 is connected to the body. The catcher is manufactured in accordance with TU 3668-005-00217567-99 at the Ishimbay Machine-Building Plant OJSC in the Republic of Bashkortostan / address: 453204, Republic of Bashkortostan, Ishimbay, ul. B. Khmelnitsky, 2 /.

The disadvantage of the above-mentioned catchers is the inability to use them to catch sucker rods with a diameter of 25 mm, to carry out fishing work only inside the tubing, unreliable fastening of the collet gripper, the catcher does not let the body of the rod pass more than 2 meters, the connecting thread of the rods is weak - Ш19 and low load capacity - up to 4-5.5 tons.

To extract emergency tubing and rods, a significant axial load must be applied, which does not allow the use of these catchers.

Known catcher of sucker rods (patent No. 2170327, M. class. 7, E 21 B 31/18, publ. 10.07.2001), designed for catching rods in the string of tubing and with the capture / focus / for the elements of the threaded connection - a coupling, persistent and supporting collars on the head of the rod with the help of a collet and comprising a housing, a sub, a collet with feathers located in the windows of the housing. The sub is connected to the housing via rods. The rods are located taking into account the gap between them of the body of the catch rod. On the outer surface of the feathers ledges are made for interaction with the upper edges of the windows of the housing.

This catcher is a close analogue of LSHU type catchers and is distinguished by the fact that it is elongated due to 2 welded thin rods that connect the head with thread type Ш19, Ш22 and the body with a collet grip. The catcher is lengthened to allow torn rod bodies to pass through it.

This design allows you to work in wells with paraffin-resinous deposits, since the asphalt-resinous and paraffin oil components freely pass through the gaps between the rods in both axial and radial directions.

A disadvantage of the known catcher is the impossibility of using it for catching sucker rods with a diameter of 25 mm, fishing operations only inside the tubing, unreliable fastening of the collet gripper, the connecting thread of the rods is weak - Ш19, Ш22 and a small load capacity - up to 4-5.5 tons.

A well-known trap for sucker rods (patent No. 2191246, publ. 10/20/2002), designed to retrieve the remaining string of sucker rods in the well and to release from the captured sucker rods when it is impossible to remove them. The rod catcher contains a housing, a collet, a sub with holes. The casing is made in the form of a pipe and is connected to the sub on one side and to the funnel on the other. On the inner side, the housing has a conical surface that interacts with the conical outer surface of the collet. On the inner surface of the collet teeth are cut along a helical line. Lugs are made on the sub, fixing the collet against rotation relative to the housing.

A disadvantage of the known catcher is the impossibility of using it for catching sucker rods with a diameter of 25 mm, the inability to remove the sucker rod with a length of the ragged end of the sucker rod more than 2 meters - does not allow the body of the sucker rod more than 2 meters, fishing operations only inside the tubing, unreliable fastening of the collet gripper, unreliable operation of the catcher in wells with paraffin-tar deposits due to clogging of the body, the connecting thread of the rods is weak - Ш19, therefore, the low carrying capacity - up to 4-5.5 tons.

Known catcher (patent No. 1707183, M. Cl. 5, E 21 In 31/18, publ. 23.01.1992), designed to extract pipes, rods and other tools. The catcher contains a case with windows and a conical section on the inner surface. In the body cavity there are dies with inclined sections in their upper and lower parts, the dies are divorced by a spring. Above the dies, an axial spring-loaded pressure sleeve with locking elements located in the case windows is located. In the lower part of the pressure sleeve, conical sections are made on the outer and inner surfaces. The conical section on the inner surface of the pressure sleeve is made mating inclined sections in the upper part of the dies for interaction with the latter in the working position.

The disadvantage of this catcher is the sufficient complexity of the structure having three spring elements. In addition, the axis of the support elements must withstand the significant force of the spring-loaded pressure sleeve. In the case of this catcher, windows for cutting out the retaining elements of the spring-loaded pressure sleeve are cut through, and this violates the integrity of the body, so the catcher has insufficient carrying capacity when lifting jammed rods and tubing in the production casing. In addition, the withdrawal of retaining elements from the windows of the housing can lead to jamming of the catcher in the production casing of the well. There is no reliable and high-quality catching and extraction of the body of a dangling rod with a length of a dangling end of the pump rod of 1-2 meters or more, since the clamping force depends on the force generated by the spring above the pressure sleeve.

Known / patent US 1728781, 1929, 6 pp. / Catcher of sucker rods of the so-called "slip type", in which the gripper of the sucker rods is made in the form of dies crackers, structurally representing a "slip" - a hollow cylindrical hardened sleeve, sawn into 3 petals from below at 120 degrees., the lower part of the petals is thickened and made in the form of crackers floating on the conical surface of the body, the body of the catcher is attached to the tubing. The sucker rod catcher is designed according to the diameter of the tubing and allows only the upper torn rod to pass through its bore section.

This catcher provides capture and passing through itself only the top of the ragged rod, provided that the ragged rod is located in the center of the production string.

The disadvantage of this catcher is the inability to catch bent rods when the coupling or threaded connection of the pump rod is located at the top, the impossibility of passing any number of rods, the inability to center the upper torn or torn rod in the center of the production string. This catcher does not have a maximum load capacity, since it hooks only on the smooth surface of the sucker rods and can slip at maximum load. The trap-dies of the catcher are hardened and hard, therefore, if they do not fall in the center, a break and loss of broken dies-crackers is possible, which aggravates the emergency. The catcher is designed according to the diameter of the tubing, so when the torn end of the pump rod is located near the wall of the production string, he cannot center it and, conversely, can bend the pump rod.

The closest analogue is (patent US 3549187, 1970, 8 pp.) A combined catch of sucker rods, comprising a housing consisting of two parts - upper and lower, each of which has a conical surface and a grip of sucker rods, made in the form: in the upper part in in the form of crackers / "slips" /, with the possibility of axial movement and away from the center in the conical surface of the housing / the upper part is designed to capture the dangling end of the pump rod / and in the lower part in the form of a grip, having the possibility of axial Extensions and to the sides from the center in the conical surface of the housing and fixing under the coupling, the stop and support collars on the head of the pump rod / the lower part is designed to capture the bent end of the coupling or thread of the pump rod /. The case of the catcher is connected to the head of the catcher, to which either a pump rod or a cable with wire is connected.

This combination catcher is designed to catch dangling or bent sucker rods in the tubing string.

The disadvantage of this catcher is its sufficient complexity, as it consists of two catchers for catching dangling and turned away sucker rods. The possibility of fishing operations only inside the tubing, the unreliable fastening of the “slip” and collet grips, the unreliability of the catcher in wells with paraffin-tar deposits - they clog the casing, the connecting thread is rod-shaped, so the light load capacity is up to 4-5.5 tons. Inability to work inside the production casing of the well.

The objective of the invention is to carry out reliably and efficiently work inside the production casing to lift tubing and pump rods stuck in the production casing, to increase the carrying capacity of the catcher up to 35-40 tons to raise the tubing stuck in the production casing with rods and to equip replaceable crackers for all rod sizes 25-22-19 mm.

The problem is solved in that the combined trap of sucker rods, having the ability to pass through its cross-sectional section of sucker rods, comprising a housing having a conical surface and connected in the upper part to the head, gripping the sucker rods made in the form of crackers with axial movement and away from the center in the conical surface of the housing and fixing under the coupling, the stop and support collars on the head of the rod, and a guide funnel having a conical surface inside for both sintering the possibility of moving the ragged or bent upper end of the rod away from the wall of the production casing and centering it in the center of the housing, characterized in that the gripping of the pump rods is made in the form of two replaceable crackers floating on the conical surface of the housing for pump rods of 25, 22 and 19 sizes mm, the guiding funnel has a conical surface inside it together with the body, tubing connected to the head of the rod trap for lowering the rod trap, When this catcher constructed sucker rod diameter production casing, it has the ability to pass through its orifice sucker rods, jammed in the tubing, and the tubing - in the production string.

In contrast to the known rod-type catchers, this catcher is designed according to the diameter of the production string; a funnel is installed on it, which allows the torn or unscrewed upper end of the rod to be moved away from the wall of the production string and centered on the center of the catcher body. The cross section of the catcher allows any diameter and any number of rods to pass through, so for this type of catcher it does not matter what is above the emergency tubing - a dangling or bent end of the rod (Figure 1). In the case, the catcher has a conical surface along which, with the possibility of axial movement, up and to the sides of the center move - (“float”) crackers (smooth). The gripping of the rods is made under the coupling, the thrust and supporting collars on the rod head with the help of dies-crackers floating on the conical surface of the catcher body, that is, it has a high degree of reliability.

Figure 2 shows the catcher in the position of passage of the coupling connection of the rod in the body of the catcher when it moves down / down the catcher /. Figure 3 shows the capture of the coupling connection of the rods using floating on the conical surface of the body of the catcher dies-crackers during the movement of the catcher up / lifting the catcher /. Figure 4 and Figure 5 depicts a sectional view of floating crackers (smooth). The catcher is equipped with three standard sizes of dies-crackers for all standard sizes of rods 25-22-19 mm, while only the wall thickness of the dies-crackers changes (Figure 4 and Figure 5). Dies crackers are installed in the catcher according to the size of the upper sucker rods located above the tubing.

The catcher (Fig. 2 and Fig. 3) consists of a body 4 connected in the upper part to the head of the catcher 3, in the lower part the catcher is connected to the guide funnel 5. Inside the body 4 of the catcher there are two crackers 6. The body of the catcher 4 has a conical surface on which with the possibility of axial movement both crackers (smooth) move - “float” dies (smooth) 6. Axially move the trap head 3 to the tubing / tubing / on which the trap descends. The guide funnel 5 together with the housing 4 inside have a conical surface that allows you to move the upper ragged end of the pump rod 2 or the unscrewed pump rod 2 from the wall of the production casing 1 and center the pump rod in the center of the catcher body 4. The body 4 is connected to the head of the catcher 3 and the guide funnel 5 threaded connections. The catcher works as follows.

When lowering the trap on the tubing, the upper torn end of the pump rod 2 or the upper unscrewed pump rod 2 (Figure 1) is moved away from the wall of the production casing of the well 1 using the guiding funnel 5 (Figure 2) and is centered on the center of the body of the trap 4 ( Figure 2). The pump rod enters the body of the catcher 4, while the coupling connection of the pump rod moves the crackers (smooth) 6 along the conical surface inside the body of the catcher 4 to the upper position and to the sides (Figure 2) and passes through the body 4 and the head of the catcher 3. After passing through the sleeve connection of the pump rod 2 inside the housing 4 and the head of the catcher 3, crackers (smooth) 6 slide along the conical surface inside the housing to the lower position (Figure 3) and when lifting the tubing string with the catcher up the crackers 6 the hope but are fixed under the coupling connection of the pump rod 2, thereby reliably gripping the rod (Figure 3). Since, as a rule, the pump rods are stuck in the tubing, and the tubing in the production string, the catcher for the pump rods raises the entire design of the tubing and pump rods to the surface, having a sufficient carrying capacity.

The proposed solution will allow reliable and high-quality work inside the production casing to lift tubing and pump rods stuck in the production casing. The catcher has a maximum load capacity of 35-40 tons, which allows lifting tubing with rods stuck in the production casing. The catcher is equipped with interchangeable crackers for all sizes of rods 25-22-19 mm.

Claims (1)

Combined sucker rod sucker having the ability to pass sucker rod suction through its passage section, comprising a housing having a conical surface and connected in the upper part to the head, sucker rod gripper made in the form of crackers having axial movement and away from the center the conical surface of the housing and fixing under the coupling, the thrust and supporting collars on the head of the rod and the guide funnel having a conical surface inside to provide the ability to move the revolution of a boiled or bent upper end of the rod from the wall of the production casing and centering it in the center of the housing, characterized in that the gripping of the pump rods is made in the form of two replaceable dies crackers floating on the conical surface of the housing for pump rod sizes of 25, 22 and 19 mm in diameter, a guide the funnel has a conical surface inside the housing together with the housing; tubing for connecting the sucker rod is connected to the head of the sucker rod for pump rods, while the sucker rod sucker truirovan diameter production casing, has the ability to pass through its orifice sucker rods, jammed in the tubing, and the tubing - in the production string.

Images