CN220979464U - Leak-proof well flushing device for oil well - Google Patents

Abstract

The utility model provides an oil well leak protection well flushing device, the valve ball, the disk seat is placed in the side opening of valve body, the valve ball sits on the disk seat, the lower terminal surface of disk seat is pushed down to the valve gap, fixed joint is connected with the lower part of valve body, two locating pieces card are in the recess of center tube, the internal thread of seal cover and the external screw thread connection of locating piece, the leather cup, push away the cover suit outside the center tube, push away in the lower part of cover inserts the upper portion of seal cover, push away between the lower part of cover and the upper portion of seal cover by the setting pin connection, fixed joint, oil pipe, connect in proper order, the length of oil pipe is greater than 3m, the packing element suit is outside the center tube, the upper portion of packing element inserts in the lower part of seal cover, the packing element is connected into an organic whole by the deblocking pin connection with the lower joint, the upper portion of hanging joint is connected with the lower part of packing element, the upper portion of lower joint is connected with the lower part of center tube, make push away the lower terminal surface, the outer wall of center tube, the upper end face of packing element, lower joint enclose into the enclosure space, hydraulic oil fills.

Description

Leak-proof well flushing device for oil well

Technical Field

The utility model relates to underground equipment for an oil field oil production well, in particular to an oil well leakage-proof well washing device.

Background

In wax-deposition oil well production, the oil well can be maintained to be normally produced by frequently carrying out hot water circulation well washing on the oil pipe of the oil pump. The well flushing method is to pump hot water into the casing pipe, mix the hot water with well liquid under the oil pump, and return the hot water from the oil pipe on the oil pump. Because the casing is communicated with the oil layer, the well flushing pressure is generally high, high back pressure is generated on the oil layer, well flushing water easily enters the oil layer, and the situation is called lost circulation. In this case, on one hand, the water-sensitive oil layer is damaged, and the oil layer is pressed down, so that the oil layer cannot be discharged; on the other hand, the well washing water leaks into the stratum, so that the dosage of the well washing water can be increased, the well washing time is long, and the manpower and material resources are increased. Technicians developed well-flushing pipe strings, and installed self-sealing packers under oil pumps, such as chinese patent: 2008200194971 gas-proof oil layer well flushing protector, its purpose is to separate the well flushing pressure from the oil layer pressure, prevent the well flushing liquid from entering the low pressure leakage oil layer to cause pollution and damage to the oil layer, and protect the oil layer. However, the existing similar well flushing protector is installed under the oil pump, the depth under the well flushing protector is large, the well flushing pressure is large, the pressure bearing capacity of the used packer is limited, the packer is not suitable for bearing the pressure during well flushing for a long time, a rubber cylinder is easy to damage, well flushing liquid is easy to leak into a stratum, and therefore the effective period of the well flushing protector under the oil pump is short, and the ideal effect cannot be achieved.

Disclosure of Invention

The utility model aims to provide an oil well leakage-proof well flushing device, which solves the problems existing in the prior art, is arranged below an oil well pump, has shallow well depth and low well flushing pressure, prevents the well flushing pressure from leaking into a stratum, and effectively protects an oil layer for a long time.

The purpose of the utility model is realized in the following way: the sealing sleeve comprises a valve body, a valve ball, a valve seat, a valve cover, a fixed joint, an oil pipe, a joint, a leather cup, a central pipe, a push sleeve, a setting pin, a sealing sleeve, a positioning block, a deblocking pin, a rubber sleeve, a hanging joint and a lower joint, wherein a side hole of the valve body is communicated with an internal channel of the valve body A closed space is enclosed between the upper end surfaces of the lower joints, hydraulic oil is filled in the closed space, an oil pipe is connected below the lower joints, and an oil pump is arranged below the oil pipe.

The utility model has the beneficial effects that: the check valve is arranged in the side hole of the valve body, and the piston of the oil pump can pass through the valve body, so that the check valve can be arranged on the oil pump, is suitable for hot washing and paraffin removal of a paraffin-removing well on the pump, does not need to be arranged under the pump, has shallow depth and low well washing pressure, can prevent the well washing pressure from leaking into a stratum, and can effectively protect an oil layer for a long time. The rubber cylinder has long service life, can keep normal hot washing paraffin removal for a long time, and ensures long-term normal production of paraffin removal wells.

Drawings

Fig. 1 is a block diagram of an embodiment of the present utility model.

Detailed Description

An embodiment of the present utility model will be described with reference to fig. 1.

As shown in fig. 1, the embodiment of the utility model comprises a valve body 1, a valve ball 3, a valve seat 4, a valve cover 5, a fixed joint 6, an oil pipe 7, a joint 8, a leather cup 9, a central pipe 10, a push sleeve 11, a setting pin 12, a sealing sleeve 13, a positioning block 14, a deblocking pin 15, a rubber cylinder 16, a hanging joint 17 and a lower joint 18, wherein a side hole of the valve body 1 is communicated with an internal channel, the valve ball 3 and the valve seat 4 are placed in the side hole of the valve body 1, the valve ball 3 is seated on the valve seat 4, the valve cover 5 presses the lower end surface of the valve seat 4, the fixed joint 6 is connected with the lower part of the valve body 1, a communicating hole of the valve cover 5 is aligned with a hole of the valve seat 4, the valve ball 3, the valve seat 4, the valve cover 5 and the fixed joint 6 form a single-flow mechanism in the side hole of the valve body 1, liquid flow can only flow inwards from the outside the valve body 1 through the valve seat 4 and cannot flow outwards from the valve body 1 through the valve seat 4, the positioning block 14 is two semicircular blocks, the two semicircular blocks are folded into a cylinder, the positioning block 14 is clamped in a groove of the central tube 10, an internal thread of the sealing sleeve 13 is connected with an external thread of the positioning block 14, so that the sealing sleeve 13 cannot axially move on the central tube 10, the leather cup 9 and the pushing sleeve 11 are sleeved outside the central tube 10, the lower part of the pushing sleeve 11 is inserted into the upper part of the sealing sleeve 13, the lower inner wall of the pushing sleeve 11 is sealed (by a sealing ring) with the outer wall of the central tube 10, the lower outer wall of the pushing sleeve 11 is sealed (by a sealing ring) with the inner wall of the sealing sleeve 13, the lower part of the pushing sleeve 11 is connected with the upper part of the sealing sleeve 13 by a setting pin 12, the fixed joint 6, the oil tube 7 and the joint 8 are sequentially connected, the length of the oil tube 7 is more than 3m, the rubber cylinder 16 is sleeved outside the central tube 10, and the upper part of the rubber cylinder 16 is inserted into the lower part of the sealing sleeve 13, the insertion part between the rubber cylinder 16 and the sealing sleeve 13 is kept sealed (with a sealing ring), the rubber cylinder 16 and the sealing sleeve 13 are connected into a whole through a deblocking pin 15, the hanging joint 17 is hung with the lower joint 18, the hanging joint part is kept sealed (with a sealing ring), the upper part of the hanging joint 17 is connected with the lower part of the rubber cylinder 16, the connection part is kept sealed (with a sealing ring), the upper part of the lower joint 18 is connected with the lower part of the central tube 10, so that a closed space is enclosed among the lower end face of the push sleeve 11, the outer wall of the central tube 10, the inner wall of the rubber cylinder 16 and the upper end face of the lower joint 18, hydraulic oil is filled in the closed space, an oil pipe is connected below the lower joint 18, and an oil pump is arranged below the oil pipe.

The utility model is designed for being used in the sleeve with the external diameter of ¢ and 139.7, because the valve body 1 is of an eccentric structure, the diameter is designed to be about ¢, and the external diameters of the sealing sleeve 13, the rubber cylinder 16 and the hanging joint 17 are about ¢, so the valve body 1 cannot be too close to the sealing sleeve 13, the rubber cylinder 16 and the hanging joint 17, or cannot be put into the sleeve with the external diameter of ¢ and 139.7.

The leather cup 9 is in a horn shape, the horn mouth of the leather cup is upwards, the outer diameter of the horn mouth is larger than the inner diameter of the sleeve, and the leather cup can form a self-seal with the inner wall of the sleeve.

A spring 2 can be arranged above the valve ball 3, so that the valve ball 3 can be conveniently reset.

The utility model is below the wax deposition point of the pumping string (typically above 800m from the wellhead). During well flushing, well flushing liquid (high-temperature hot water) is pumped into the sleeve, so that a pressure difference is formed between the upper and lower parts of the leather cup, downward thrust is generated, the setting pin 12 is sheared, the inner cavity pressure of the rubber cylinder 16 is increased, and the rubber cylinder 16 expands and keeps sealing with the sleeve. The flushing fluid can only open the valve ball upwards from the side hole of the valve body 1 to enter the upper oil pipe of the pump to form a flushing channel, the flushing fluid has the function that flushing water cannot enter stratum, the flushing attempt is shallow, the flushing pressure is low, the service life of the utility model is long, and the paraffin precipitation well can be produced normally for a long time.

When the pipe column is lifted up in the next well workover, the deblocking pin 15 is sheared, the inner cavity of the rubber cylinder 16 is communicated with the outside, the pressure in the rubber cylinder 16 is reduced and recovered, and the angle seal is realized, so that the utility model can be lifted up smoothly.

Claims (1)

1. The utility model provides an oil well leak protection well flushing device, includes valve body (1), valve ball (3), disk seat (4), valve gap (5), fixed joint (6), oil pipe (7), connects (8), leather cup (9), center tube (10), push away cover (11), sit seal pin (12), seal cover (13), locating piece (14), deblocking pin (15), packing element (16), link joint (17), lower clutch (18), characterized by: the side hole of the valve body (1) is communicated with the internal channel, the valve ball (3) and the valve seat (4) are arranged in the side hole of the valve body (1), the valve ball (3) is seated on the valve seat (4), the valve cover (5) presses the lower end surface of the valve seat (4), the fixed joint (6) is connected with the lower part of the valve body (1), the communication hole of the valve cover (5) is aligned with the hole of the valve seat (4), the valve ball (3), the valve seat (4), the valve cover (5) and the fixed joint (6) form a single-flow mechanism in the side hole of the valve body (1), liquid flow can only flow inwards from the outside of the valve body (1) through the valve seat (4), and cannot flow outwards from the inside of the valve body (1) through the valve seat (4), the positioning block (14) is two semicircular blocks, the two semicircular blocks are folded into a cylinder, the positioning block (14) is clamped in the groove of the central tube (10), the internal thread of the sealing sleeve (13) is connected with the external thread of the valve seat (4), the sealing sleeve (13) cannot move axially on the central tube (10), the sealing sleeve (9), the sealing sleeve (11) is sleeved on the inner wall of the sealing sleeve (11) and the inner wall of the sealing sleeve (11) is inserted between the inner wall of the sealing sleeve (11) and the outer sleeve (11) is pushed by the inner sleeve (11, the lower part of the push sleeve (11) is connected with the upper part of the sealing sleeve (13) through a setting pin (12), the fixed joint (6), the oil pipe (7) and the joint (8) are sequentially connected, the length of the oil pipe (7) is larger than 3m, the rubber cylinder (16) is sleeved outside the central pipe (10), the upper part of the rubber cylinder (16) is inserted into the lower part of the sealing sleeve (13), the insertion part between the rubber cylinder (16) and the sealing sleeve (13) is kept sealed, the rubber cylinder (16) and the sealing sleeve (13) are connected into a whole through an unsealing pin (15), the hanging joint (17) is connected with the lower joint (18) in a hanging mode, the upper part of the hanging joint (17) is connected with the lower part of the rubber cylinder (16), the connecting part is kept sealed, the upper part of the lower joint (18) is connected with the lower part of the central pipe (10), and a closed space is formed between the lower end face of the push sleeve (11), the outer wall of the central pipe (10), the inner wall of the rubber cylinder (16) and the upper end face of the lower joint (18), the lower joint (18) is filled with hydraulic oil, and the lower joint (18) is connected.