CN2908771Y - Three-way valve for underground oil production pipe of oil well - Google Patents

Abstract

The utility model belongs to a downhole flow string used tee valve of oil well comprising a tee valve body and a combined type upper contact on the tee valve body, and a fixed or detachable lower contact under the tee valve body and a main flow channel. A connection body including a valve pocket, an upper flow channel and an inside lower channel with a valve base, a back-flush and oil drainage channel with a normally closed non-return valve and a normally open valve outside is provided on side wall in the valve body. A plug of the normally closed non-return valve is in the valve base on the back-flush and oil drainage channel during oil extraction and is in the valve base of the inside lower channel during back flush and oil drainage. The utility model is characterized in easiness to operate during back-flush and oil drainage, reliability and reserving a middle test channel, ability to ensure successful well cleanup and oil drainage operation, effectively saving construction time and reduction of cost of operation and so on. The utility model eliminates the defects of prior technology, such as difficulty in opening the oil drainage channel during operation, poor reliability, much operation time, high cost of operation, incapability of well cleanup and oil drainage and so on.

Description

The effective three way cock of oil well down-hole oil production

Technical field

The utility model belongs to a kind of and the supporting three way cock of using of oil well down-hole oil production pipe, particularly a kind ofly is exclusively used in the three way cock that well-flushing and draining are used in oil well pump detection and workover process.

Background technology

In oil well pump detection and workover process, well-flushing and draining two links that are absolutely necessary.Routine is located at the device that being exclusively used in well-flushing and draining in the inspection pump process on the oil pipe of oil pump top, the one: adopt and be with the fixedly safety valve kindred organization of diaphragm, promptly be to offer a ladder on the tubing wall, diaphragm with bearing certain pressure, retainer ring and sealing mat by band centre bore and screw thread are anchored on it on tube wall, improve pressure in the oil pipe by surface pump before the well-flushing in the pump detection and workover process and diaphragm is popped realize that oil pipe is communicated with outside pit shaft cavity, to reach well-flushing and to put forward the purpose of draining when managing; Though this type of mechanism has characteristics such as simple in structure, but after existing oil pipe to be in the long-term work state, because sealing ring lost efficacy (poorly sealed) or there is leakage phenomenon etc. in oil pipe itself, diaphragm can not be popped, thereby can't carry out disadvantages such as well-flushing, draining operation; It two is: the hollow delivery pipe that an inner sealing is set at the sidewall of bleeder body, the body tail end passes tube wall and by pressure cap and tubing wall fit sealing, then pound disconnected before the well-flushing or break by the body that will radially be provided with from the oil pipe of well head caber suitable for reading, oil pipe is communicated with outside pit shaft cavity, to carry out operations such as well-flushing, publication number is CN2653121, name is called " thrusting the formula Leak artifact " and promptly belongs to this type of technology, this type of device is owing to set up a body in pipe aperture, make testing tool be difficult to be lowered to, in addition, owing to be subjected to the influence of factors such as the thick and oil well gradient of oil is big, institute's caber body whereabouts strength weakens, and set body can not be broken, also will cause carrying out well-flushing and draining operation.Therefore, the above-mentioned background technology exists all that the activity duration is long when opening well-flushing, drainage device, operating cost is high, and the poor reliability of well-flushing, draining mechanism (device), and easy generation can't be carried out well-flushing, draining operation, influences oil well yield; And also there are disadvantages such as blocking-up test channel in the formula bleeder of thrusting.

The summary of the invention goal of the invention is the disadvantage that exists according to background technology, design the effective three way cock of a kind of oil well down-hole oil production, reach efficient and reliability, shorten the activity duration, reduce operating cost, guarantee purposes such as oil well ordinary production with well-flushing, draining operation before the raising pump detection and workover.

Solution of the present utility model is that valve body is designed to three way cock, the connected component of band one way valve and a communication channel is set on its sidewall, wash and draining operation automatically so that return, therefore, the utility model comprises the body that is provided with sprue import and export and upper and lower joint; Key is that its body is a triple-valve body, the top connection of being located on the three way cock body is the combined type top connection, also be provided with one on the sidewall in valve body and comprise valve pocket and be positioned at the upper runner on valve pocket top, be positioned at its underpart inboard and with the lower flow channel of valve seat, be positioned at that the outside, its underpart and string are provided with that returning of normally closed one way valve and normal opening one-way closed valve washed and the draining passage connected component; Top connection and body are fastened and connected by screw thread and sealing ring and fix by dog screw after upper runner and valve pocket contraposition, return wash and the closed spool of normal opening one-way of draining channel middle by movable its valve seat top that is supported in of spring, and the top adopts spacing rod spacing, during the normal closed valve core oil extraction operation seat in the valve seat of this passage upper end, return and wash and during draining then in the valve seat of seat on inboard lower flow channel.

For convenience processing and economical with materials, the lower contact that is provided with the sprue import is detachable joint, is integral by screw thread and sealing ring and valve body body fit sealing.

The utlity model has return wash convenient with the draining Job Operations, reliability is high and kept test channel in the middle of the oil pipe, can guarantee that well-flushing and the draining in the pump detection and workover carries out smoothly, saved the engineering time effectively, reduced characteristics such as operating cost.

Description of drawings

Fig. 1, be the utility model structural representation.

Among the figure: 1, lower contact, 1-1, import, 2, body, 2-1 sprue, 2-2,2-3: dog screw, 3, top connection, 3-1, outlet, 4, upper runner, 5, connected component, 6, valve pocket, 7, normally closed nonreturn valve core, 7-1,7-2: valve seat, 8, inboard lower flow channel, 9, spacing rod, 10, the normally open valve core, 11, support spring, 12, outer flow passage, 12-1, outer flow passage end opening.

The specific embodiment

With with diameter phi 73mm (

The time) flow string is supporting is example with three way cock: lower contact 1, adopt detachable joint and adopt the same specification flow string to process, joint axis is to long 120mm, internal diameter is identical with the flow string internal diameter, top is tightly connected by straight pipe thread and body 2, the lower end is connected with the oil pump delivery outlet by taper pipe thread, body 2 adopts 35CrMo steel integral body to process, axial high 190mm, upper diameter φ 148mm, sprue 2-1. internal diameter is identical with the flow string internal diameter, inboard lower flow channel 8 diameter phi 28mm, its top valve seat bore φ 33mm, on the outer flow passage 12., the lower end mouth diameters is respectively 33mm and φ 25mm, wherein with support spring cooperation place cylindrical hole internal diameter φ 27.5mm, the high 40mm in hole, middle part valve seat bore φ 34mm, high φ 33mm, upper flow passage internal diameter φ 30mm, high 32mm, top valve seat diameter phi 33mm, high 17mm.Normally closed nonreturn valve core 7 sphere diameter φ 32mm, normally open valve core 10 sphere diameter φ 29mm, its support spring 11. large and small footpaths are φ 1.5 * 22, high 41mm supporting force 5N, top connection 3. top external diameter φ 89mm, it in it taper thread hole that is connected with the outer taper pipe thread of flow string, hole depth 50mm, lower outer diameter also is φ 148mm, be fastened and connected by screw thread and sealing ring and body 2, and with valve pocket 6 contrapositions after fix with dog screw 2-2, upper runner 4 and the bore dia that is communicated with sprue 2-1 thereof are φ 25mm, upper runner 4 long 50mm; Valve pocket 6 is special-shaped cavity, horizontal wide 70mm, high 40mm.Spacing rod 9 diameter phi 4mm, outer end and connected component 5 fit sealings.

When present embodiment uses by under reach top connection and be connected to downhole oil delivery side of pump and flow string lower end respectively, normally closed nonreturn valve core 7 was positioned on the valve seat 7-1 of the outside when normally (oil recovery) worked, the oil of oil pump output is through major flow 2-1 and inboard lower flow channel 8, valve pocket 6 and upper runner 4, and 3-1 enters flow string through outlet.During well-flushing operation when carrying out pump detection and workover, flushing fluid by pit shaft after outer flow passage end opening 12-1, outer flow passage 12 and normally open valve core 10 wash open and make it to enter inboard valve seat 7-2 normally closed nonreturn valve core 7, the draining road opens wide, upper runner 4 is communicated with through valve pocket 6 with outer flow passage 12, on can finish the draining operation when carrying tubing manipulation.The setting of normally open valve core 10 can not closed under draining pressure, and in oil extraction operation when if the normally closed one way valve in top takes place to leak, this spool 10 will be closed under oil recovery pressure, thereby play the effect of dual fail-safe.

Claims (2)

1, the effective three way cock of a kind of oil well down-hole oil production comprises the body that is provided with sprue and import and export and upper and lower joint; Be characterised in that its body is a triple-valve body, the top connection of being located on the three way cock body is the combined type top connection, also be provided with the upper runner that comprises valve pocket and be positioned at valve pocket top on the sidewall in valve body, be positioned at its underpart inboard and with the lower flow channel of valve seat, be positioned at that the outside, its underpart and string are provided with that returning of normally closed one way valve and normal opening one-way closed valve washed and the draining passage connected component; Top connection and body are fastened and connected by screw thread and sealing ring and fix by dog screw after upper runner and valve pocket contraposition, return and wash and the normal opening one-way closed valve spool of draining channel middle is supported in its valve seat top and the top adopts spacing rod spacing by support spring is movable, during the normal closed valve core oil extraction operation seat in the valve seat of this passage upper end, return and wash and during the draining operation then in the valve seat of seat on inboard lower flow channel.

2, by the effective three way cock of the described oil well down-hole oil production of claim 1, the lower contact that it is characterized in that being provided with the sprue import is detachable joint.

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