CN101748983B - Protector for oil pipe working under pressure used for oil well - Google Patents
Protector for oil pipe working under pressure used for oil well Download PDFInfo
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- CN101748983B CN101748983B CN 200810239399 CN200810239399A CN101748983B CN 101748983 B CN101748983 B CN 101748983B CN 200810239399 CN200810239399 CN 200810239399 CN 200810239399 A CN200810239399 A CN 200810239399A CN 101748983 B CN101748983 B CN 101748983B
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Abstract
The invention relates to a protector for oil pipe working under pressure used for oil well and a method for tubing oil string under pressure. The invention provides the protector for oil pipe working under pressure used for oil well at first, which includes a body, an upper joint, a lower joint, a seal ball, a seal ball tube, a ball holding room and an inhibiting device. The protector for oil pipe working under pressure used for oil well provided by the invention has a simple and rational structure, can work under pressure when tubing the oil string in the oil well, can avoid adopting killfluid to pollute a hydrocarbon reservoir, thereby protecting the hydrocarbon reservoir, but also can guarantee the safety during the operating process of tubing the oil string, and can not cause blowout. Moreover, the protector for oil pipe working under pressure used for oil well provided by the invention can open an operating channel by only needing to implement pressing operation so as to transfer into the oil well production state after finishing the operation of tubing the oil string and mounting a Christmas tree, and has the characteristics of less operating procedures and simple operations, etc, which greatly reduces the work load, saves the operating cost and reduces the production cost.
Description
Technical field
The present invention relates to a kind of protector for oil pipe working under pressure used for oil well, it is a kind of oil well tubing string erecting tools, belongs to field of petroleum exploitation.
Background technology
Under Oil/gas Well in (installation) tubing string operation process, because when descending last root tubing string, the bottom tubing string will be inserted in the Back-off Pipe String at packer place, thereby open the high-pressure oil gas at the bottom of the lower well, blowout will occur along channeling to well head on the tubing string in down-hole high pressure oil gas, brings potential safety hazard to job execution.
For fear of blowout occurring, the common work flow of taking is to squeeze into the large well killing fluid of some density when tripping out tubing string in pit shaft at present, makes the head of liquid of pit shaft greater than the strata pressure in shaft bottom, pushes down the reservoir hydrocarbons of down-hole and it can not be sprayed.But take this method to avoid the blowout meeting to bring following problem: in implementing Well Killing Process, because the well liquid column pressure is greater than strata pressure, heavy well killing fluid can be missed in the oil-gas Layer, thereby causes reservoir pollution.But, at present not other preferably method can avoid this problem.
Therefore, for fear of blowout and prevent from polluting the stratum in tubing string installation exercise process, develop a kind of oil pipe Operating Pressure protector that does not need kill job, the safety when guaranteeing the oil pipe Operating Pressure is this area problem demanding prompt solution.
Summary of the invention
For solving the problems of the technologies described above; the object of the present invention is to provide a kind of protector for oil pipe working under pressure used for oil well; have simple in structure, safe, long service life, the characteristics such as simple to operate, convenient to use, be applicable to the operation process that in oil well operation process band is depressed tubing string.
The present invention also aims to provide a kind of band to depress the method for tubing string, carry out the operation of lower tubing string by adopting above-mentioned protector for oil pipe working under pressure used for oil well, can realize safety in production, avoid occurring polluting the phenomenons such as reservoir, blowout.
For achieving the above object, the invention provides a kind of protector for oil pipe working under pressure used for oil well, this protector for oil pipe working under pressure used for oil well comprises: body, top connection, lower contact, ball sealer, sealing bulb, receipts ball chamber and stopping means;
Described sealing bulb is positioned at described body interior, described top connection, lower contact are tubulose, wherein, top connection is threaded connection with the upper end of sealing bulb, lower contact is communicated with the lower end of sealing bulb, and, the central axes of top connection, lower contact and sealing bulb, extend to respectively externally from up and down two ends of body, form the oil flow channel that is communicated with;
The tube wall of sealing bulb is provided with spacing hole, and described stopping means is arranged on the outer wall of sealing bulb, and protrudes in the sealing bulb by spacing hole, can shrink to ball sealer tube wall direction during its pressurized;
Ball sealer is positioned at the top connection below of sealing bulb, and be stuck in described protrude into the sealing bulb stopping means on, the diameter of ball sealer is greater than the internal diameter of top connection, less than the internal diameter of sealing bulb, and can realize sealing to oil flow channel during the lower end in contact of ball sealer and top connection;
Described receipts ball chamber is positioned at body, is respectively equipped with ball hole and ball mouth, and is communicated with the sealing bulb by ball hole, and the position of ball hole is lower than the position of stopping means; Position corresponding to ball hole in the sealing bulb is provided with guiding device, can guide the ball sealer that moves downward along the sealing bulb to enter receipts ball chamber; Receive the ball chamber and be communicated with body exterior by ball mouth, ball sealer can be left by ball mouth receive the ball chamber.
According to concrete technical scheme of the present invention, preferably, above-mentioned stopping means comprises spacing ball, Compress Spring and position-limiting tube, and wherein: position-limiting tube is horizontally disposed with, and an end is connected on the outer wall at the spacing hole place that seals bulb, and the other end is fixed on the inwall of body; Spacing ball and Compress Spring are positioned at position-limiting tube, and the diameter of spacing ball is greater than the diameter of spacing hole, and partly protrude in the sealing bulb by spacing hole, and spacing ball is connected on the inwall of body by Compress Spring.
According to concrete technical scheme of the present invention, preferably, above-mentioned body interior is provided with at least two stopping means, and stopping means is positioned on the same level face, arranges with the equal angles interval.
According to concrete technical scheme of the present invention, preferably, the outer wall of above-mentioned top connection and lower contact is provided with screw thread.
According to concrete technical scheme of the present invention, preferably, the screw thread on above-mentioned top connection and the lower contact outer wall is API standard oil gas thread button.
According to concrete technical scheme of the present invention, preferably, the lower end of above-mentioned top connection is taper, forms the line contact when contacting with ball sealer, can realize the sealing to oil flow channel.
According to concrete technical scheme of the present invention, preferably, above-mentioned ball sealer is metal ball.
According to concrete technical scheme of the present invention, preferably, above-mentioned ball sealer is stainless steel ball.
According to concrete technical scheme of the present invention, preferably, above-mentioned guiding device comprises the guide rail that is arranged in the sealing bulb, and this guide rail is downward-sloping track, and this guide rail center has the through hole that at least one fuel feeding stream passes through.
According to concrete technical scheme of the present invention, preferably, the necking down structure of the lower end of above-mentioned sealing bulb for tilting becomes above-mentioned guiding device.
Protector for oil pipe working under pressure used for oil well provided by the invention in use is that vertical installation arranges; therefore, the description of related structure and position relationship all is based on this protector and is in vertical state and carries out in claims of the present invention, manual and the Figure of description.
According to specific embodiments of the present invention, the sealing bulb is positioned at body interior, and the opening of its upper end is positioned on the upper surface of body.The central axis of sealing bulb can with the central axes of body, its inwall can be provided with top connection and realize the screw thread be connected.
According to specific embodiments of the present invention, the top connection of this protector for oil pipe working under pressure used for oil well is tubulose, has the pipeline of a hollow, and this pipeline is the oil stream oil flow channel during by top connection.It is inner that top connection can be stretched into the sealing bulb by the opening of sealing bulb upper end, and be connected with the sealing bulb by the screw thread on its outer wall, i.e. top connection is connected with the ball sealer gas thread, and extends to body exterior from the upper end of body.Preferably, the outer wall that extends to a part of top connection of body exterior is provided with screw thread, can be connected with the parts such as tubing hanger of top well head by these screw threads, and the pipeline in the top connection is communicated with the corresponding component of top well head, form unobstructed oil flow channel, so that oil producing operation.
According to specific embodiments of the present invention, lower contact is tubulose, is communicated with the lower end of sealing bulb, and extends to body exterior from the body lower end.The central axes of top connection, lower contact and sealing bulb is joined together to form the oil flow channel that is communicated with up and down.Preferably, can be provided with screw thread on the outer wall of the lower contact that extends to body exterior, protector for oil pipe working under pressure used for oil well can be connected with the parts such as tubing string of bottom by this screw thread.More preferably, the screw thread on top connection and the lower contact outer wall is API standard oil gas thread button, to adapt to the standardization requirement in the production operation.
According to specific embodiments of the present invention, receive the ball chamber and be positioned at body, be respectively equipped with ball hole and ball mouth, and by ball hole with the sealing bulb be communicated with, in use, ball sealer can enter by ball hole and receive the ball chamber after falling along the sealing bulb under pressure; Simultaneously, receive the ball chamber and be communicated with body exterior by ball mouth again, being arranged in the ball sealer of receiving the ball chamber can leave receipts ball chamber by this ball mouth.
According to specific embodiments of the present invention, be provided with spacing hole at the tube wall that seals bulb, stopping means is arranged on the outer wall of sealing bulb, and partly protrudes in the sealing bulb by spacing hole, and namely the part of spacing ball protrudes in the sealing bulb; (namely ball sealer is applied downward pressure, during ball sealer extruding stopping means) under pressured state, stopping means can shrink to ball sealer tube wall direction, allows ball sealer to cross this stopping means, moves downward along the sealing bulb.
According to specific embodiments of the present invention; stopping means in the protector for oil pipe working under pressure used for oil well can be called the Extendible spacing device; this stopping means can bear the deadweight of ball sealer; namely when ball sealer only pushes this Extendible spacing device with its deadweight; the limiting component of this Extendible spacing device can not retracted; ball sealer can be limited in the top of sealing bulb; when ball sealer being applied certain downward pressure; the limiting component of this Extendible spacing device can be retracted; ball sealer is crossed this stopping means and is moved downward along the sealing bulb; wherein; the stretching out and retract and can realize by corresponding parts of this Extendible spacing device is such as protruding into spacing ball in the sealing bulb etc.Preferably, the stopping means that adopts in the protector for oil pipe working under pressure used for oil well can comprise spacing ball, Compress Spring and position-limiting tube, wherein, position-limiting tube is horizontally disposed with, one end is fixed on the inwall of protector body (it is fixing for example to adopt hold-down screw to seal), and the other end can be fixedly connected on the outer wall at spacing hole place of sealing bulb; Spacing ball and Compress Spring are positioned at position-limiting tube, and the diameter of spacing ball is greater than the diameter of spacing hole, and protrude in the sealing bulb by spacing hole, and spacing ball is connected on the inwall of body by Compress Spring.Spacing ball protrudes in the sealing bulb, contacts with ball sealer, and in the situation that does not apply downward pressure, spacing ball can bear the deadweight of ball sealer, and it is limited on the stopping means.Because the other end of spacing ball is connected with Compress Spring, therefore, when being subject to certain pressure (this pressure should greater than the ball sealer certain amplitude of conducting oneself with dignity, enough make spacing ball retract smoothly), this spacing ball can be withdrawn in the spacing hole.The elastic force of Compress Spring can be selected, and the difference size between upper pressure when its elastic force can be according to operation (the downward pressure that adds and ball sealer deadweight) and the bottom pressure (oil-air pressure) is adjusted conversion.Preferably, on the Compress Spring Material selection, should select the spring material with characteristics such as the loss of torsion in long service life, the use procedure are little, corrosion-resistant, for example, can select high performance spring steel material, it is little to have in use a torsion loss, and torsion reduces the characteristics less than 5%.
According to specific embodiments of the present invention; body interior at protector for oil pipe working under pressure used for oil well is provided with at least two stopping means, and stopping means is positioned on the same level face; more preferably, the stopping means that is positioned on the same level face can arrange with the equal angles interval.For example, at the same level face three or four stopping means are set, the angle between the adjacent stopping means is 120 ° or 90 °.
According to specific embodiments of the present invention, ball sealer is positioned at the sealing bulb, and is stuck in and protrudes on the stopping means of sealing in the bulb, and under the normal condition (when ball sealer not being applied downward external force), ball sealer can not make the stopping means retraction that is squeezed; The diameter of ball sealer should less than the internal diameter of sealing bulb, can successfully move in the sealing bulb.Can realize the sealing to oil flow channel (pipeline opening in the top connection) when guaranteeing that ball sealer contacts with top connection, the diameter of ball sealer should be greater than the diameter of the oil flow channel in the top connection (pipeline of hollow).When protector for oil pipe working under pressure used for oil well is communicated with the downhole oil tubing string; when namely opening the high-pressure oil gas in shaft bottom, ball sealer can under the effect of bottom oil-air pressure, upwards press closer the lower end of top connection; form close contact between the two, thereby realize the sealing to oil flow channel.In order to realize better sealing, preferably, the lower end of top connection can be taper, can realize the line contact when contacting with ball sealer.In order to realize sealing preferably; require ball sealer itself to have higher fineness; and; because ball sealer oil gas frequent and in the oil well contacts, therefore, ball sealer itself also needs to have certain corrosion resistance; in protector for oil pipe working under pressure used for oil well provided by the invention; the ball sealer that adopts is preferably metal ball, and for example the surface is through metal ball corrosion-resistant and that fineness is processed, more preferably stainless steel ball.
According to specific embodiments of the present invention, position corresponding to ball hole in the sealing bulb is provided with guiding device, this guiding device can be the guide rail that is arranged in the sealing bulb, after stopping means is retracted, when ball sealer falls along the sealing bulb, can under the guiding of guide rail, enter smoothly and receive the ball chamber; Above-mentioned guide rail can be downward-sloping track (for example arc or linear), and the end that guide rail is lower is connected with the lower edge of above-mentioned ball hole, the position of the two can maintain an equal level, perhaps the lower edge of the low a little higher than ball hole of an end of guide rail; After ball sealer was fallen guide rail, under the effect of its deadweight, it was indoor to tumble the receipts ball along guide rail.Enter the sealing bulb for ease of oil stream by lower contact, be provided with the through hole that at least one fuel feeding stream passes through in the above-mentioned guide rail, the aperture of this through hole is less than the diameter of ball sealer.In addition, form downward-sloping necking down structure in sealing bulb lower end, the guiding ball sealer enters receipts ball chamber also can become above-mentioned guiding device, for example form the lower end of arc or rectilinear sealing bulb, wherein, the angle that tilts is preferably 15-75 ° (with the angle of horizontal plane), and this also can guide the ball sealer that moves downward along the sealing bulb and enter receipts ball chamber by ball hole; At this moment, fall into the pipeline of lower contact for avoiding ball sealer, can make the internal diameter of lower contact less than the diameter of ball sealer.
According to specific embodiments of the present invention, the body of operation protector can be a solid, also can be a hollow body.When body is hollow body, position-limiting tube in sealing bulb and the stopping means can be the pipeline that adds that is fixed on body interior, position-limiting tube in sealing bulb and the stopping means can adopt fixed form commonly used to carry out in the fixed form of body interior, such as welding etc.; When body is solid, position-limiting tube in sealing bulb and the stopping means all can be that direct formation (for example utilizing lathe processing or cast form) is in intrinsic pipeline, its invariant position, the function that realizes is also identical, only be that fixed form is different, and these different fixed forms are that persons skilled in the art can be selected voluntarily.
The operating principle of protector for oil pipe working under pressure used for oil well of the present invention is (illustrating):
In the original state of protector for oil pipe working under pressure used for oil well, ball sealer is positioned at the top of sealing bulb, and spacing ball part under the effect of Compress Spring protrudes in the sealing bulb, plays the effect that ball sealer moves down that limits.When protector for oil pipe working under pressure used for oil well and downhole oil tubing string are in connection status; when namely opening the band pressure condition in the high-pressure oil gas situation of shaft bottom; ball sealer is under the effect of bottom oil-air pressure; top tight sealing face (being the lower end of top connection) makes progress; formation is to the sealing of oil flow channel; stop bottom oil gas upwards to flow and the generation blowout, just can carry out safely lower tubing string job execution.When oil well puts state into production, pressurizeed by top connection by the top production tree, when the upper pressure of oil flow channel during greater than bottom pressure, ball sealer moves down the spacing ball of extruding under the effect of upper pressure, move down by continuing edge sealing bulb behind the stopping means, then enter and receive the ball chamber, leave oil flow channel, oil flow channel is unimpeded about making, and can carry out the normal production operation of oil well.
The present invention also provides a kind of band to depress the method for (installation) tubing string, and it comprises:
The top connection of above-mentioned protector for oil pipe working under pressure used for oil well is connected with the tubing hanger of well head, lower contact is connected with tubing string, tubing string is installed in the oil well, make the lower end in contact oil gas of tubing string, oil gas enters protector inside by oil flow channel, and makes ball sealer push up the lower end of the top connection of pulling;
By the oil flow channel in the top connection ball sealer is applied downward pressure, force stopping means after the contraction of ball sealer tube wall direction, ball sealer is moved downward along the sealing bulb, and enter receipts ball chamber by ball hole.
According to concrete technical scheme of the present invention, the tubing string that is arranged in oil well is the oil pipe that is communicated to the high-pressure oil gas of bottom, when lower contact with after tubing string is communicated with, high-pressure oil gas can be under self pressure-acting enters lower contact and the sealing bulb is inner along oil flow channel, high-pressure oil gas is exerted pressure to ball sealer from the bottom, make ball sealer push up the lower end of (withstand or the press closer) top connection of pulling, realization is to the sealing of oil flow channel, high-pressure oil gas can't be entered in the hollow pipeline of top connection, also just blowout can not occur.Depress in the tubing string operation at the band of reality; generally need to install the multiple-tubing string post; in operation process; when being installed, uses last root tubing string (after this tubing string installation, a bottom tubing string just can contact the bottom high-pressure oil gas) protector for oil pipe working under pressure used for oil well provided by the invention.
Before producing, production tree is pressurizeed to ball sealer by top connection on top, make ball sealer extruding stopping means, when pressure was enough large, stopping means was retracted, and ball sealer and top connection disengage, and edge sealing bulb moves downward, then enter by ball hole and receive in the ball chamber, high-pressure oil gas enters the top production tree with regard to unobstructed oil flow channel about the edge, realizes adopting operation.
Protector for oil pipe working under pressure used for oil well provided by the invention possesses following advantage and disadvantage:
1, protector for oil pipe working under pressure used for oil well provided by the invention is simple and reasonable for structure, under oil well during the tubing string operation, can Operating Pressure, can avoid adopting well killing fluid contaminated oil gas-bearing formation, thereby protection oil-gas Layer, the safety in lower tubing string operation process can be guaranteed again, blowout can be do not occurred;
2, protector for oil pipe working under pressure used for oil well provided by the invention, after finishing lower tubing string operation and installing production tree, only need to suppress operation just can fulfil assignment opening of passage and change the oil well production state over to, it is few to have operation procedure, the characteristics such as simple to operate, greatly reduce the work operations amount, saved operating cost, reduced cost of production;
3, protector for oil pipe working under pressure used for oil well provided by the invention can be reused, and has long application life;
4, protector for oil pipe working under pressure used for oil well provided by the invention can be realized docking with the standardization of existing oil gas production equipment, need not existing equipment is just transformed and can directly be used, and has important practical significance.
Description of drawings
Fig. 1 is the structural representation of the protector for oil pipe working under pressure used for oil well of the embodiment of the invention 1;
Fig. 2 is the structural representation of the protector for oil pipe working under pressure used for oil well of the embodiment of the invention 2;
Fig. 3 is the structural representation of the protector for oil pipe working under pressure used for oil well of the embodiment of the invention 3;
Fig. 4 is the structural representation of the protector for oil pipe working under pressure used for oil well of the embodiment of the invention 4;
Fig. 5 is the structural representation of the protector for oil pipe working under pressure used for oil well of the embodiment of the invention 5;
The schematic diagram (original state) of the protector for oil pipe working under pressure used for oil well that Fig. 6 provides for embodiment 3;
The schematic diagram (Operating Pressure state) of the protector for oil pipe working under pressure used for oil well that Fig. 7 provides for embodiment 3;
The schematic diagram of the protector for oil pipe working under pressure used for oil well that Fig. 8 provides for embodiment 3 (well head pressurization, ball sealer move to the ball chamber state of receiving);
The schematic diagram (oil well production state) of the protector for oil pipe working under pressure used for oil well that Fig. 9 provides for embodiment 3.
The drawing reference numeral explanation
1, top connection; 2, body; 3, oil flow channel; 4, ball sealer; 5, sealing bulb; 6, receive the ball chamber; 7, ball mouth; 8, sealing surface; 9, spacing ball; 10, position-limiting tube; 11, Compress Spring; 12, track; 13, ball sealer is installed passage; 14, lower contact; 15, tubing string; 16, one way valve; 17, packer; 18, Back-off Pipe String; 19, high-pressure oil gas; 20, ball hole; 21, hold-down screw.
The specific embodiment
For making the technical problem to be solved in the present invention, feature and effect more apparent, now by reference to the accompanying drawings the specific embodiment of the present invention is described in further detail.
Shown in Figure 1 is the structure of protector for oil pipe working under pressure used for oil well when original state (when namely not coming into operation) of present embodiment, wherein:
The opening of the sealing bulb 5 of top connection 1 by being positioned at body 2 upper surfaces enters sealing bulb 5 inside, and this a part of ball sealer pipe 5 forms ball sealers passages 13 are installed; The lower end of top connection 1 can be directly with sealing bulb 5 inwalls on screw-threaded engagement, perhaps be provided with and the screw thread that seals the screw-threaded engagement on bulb 5 inwalls at the lower end of top connection 1 side; The outer wall that is positioned at the top connection 1 of body exterior is provided with screw thread, can be connected with the parts such as tubing hanger of top well head;
Receive ball chamber 6 and be positioned at body 2 inside, is communicated with sealing bulb 5 by ball hole 20, the position of ball hole 20 is lower than the position of stopping means, and its size is greater than the diameter of ball sealer 4, and ball sealer 4 can enter receipts ball chamber 6 by sealing bulb 5 by this ball hole 20; And the opposite side of receiving ball chamber 6 is provided with ball mouth 7, and ball sealer 4 can leave by ball mouth 7 and receive ball chamber 6;
Stopping means comprises spacing ball 9, position-limiting tube 10 and Compress Spring 11, wherein, position-limiting tube 10 is horizontally disposed with, one end is connected with the inwall of body 2, the other end is fixed on the outer wall of sealing bulb 5 corresponding to spacing hole, is communicated with sealing bulb 5 by spacing hole (its diameter is less than the diameter of positive stop bead ball 4); Spacing ball 9 and Compress Spring 11 are arranged in position-limiting tube 10, wherein, spacing ball 9 is received on the inwall of body 2 by Compress Spring 11, and protrudes in the sealing bulb 5 by above-mentioned spacing hole, contact with ball sealer 4, ball sealer 4 is limited position shown in the figure; Compress Spring 11 is selected high performance spring steel material, and it is little to have in use a torsion loss, and torsion reduces the characteristics less than 5%; Include two stopping means in the protector that present embodiment provides, be positioned on the same level face, become 180 ° of angles between the two;
When the downward external force that ball sealer 4 is applied a certain size (size of this external force generally should greater than the pressure of bottom oil gas), the spacing ball 9 of ball sealer 4 extruding, make spacing ball 9 retractions, stopping means loses position-limiting action, and ball sealer 4 just can rely on its deadweight to move downward along sealing bulb 5;
Enter for the ease of ball sealer 4 and to receive ball chamber 6, be provided with guiding device in the relevant position of sealing bulb 5, i.e. downward-sloping track 12, this track 12 is arc, remain basically stable in the position of the end that it is lower and the lower edge of ball hole 20; Pass through for the ease of oil stream, track 12 is provided with through hole, and the size of through hole is less than the diameter of ball sealer 4;
The structure of the protector for oil pipe working under pressure used for oil well that present embodiment provides as schematically shown in Figure 2; shown among this figure also is the structure of the protector when being in original state (when namely not coming into operation); wherein; compare with the protector for oil pipe working under pressure used for oil well that embodiment 1 provides, have following difference:
In the protector for oil pipe working under pressure used for oil well that present embodiment provides, the linear of guiding device (namely sealing the track 12 in the bulb 5) for tilting, its angle of inclination is approximately 45 ° (with the angle of horizontal plane).
Other structures of the protector for oil pipe working under pressure used for oil well that present embodiment provides are all identical with the protector for oil pipe working under pressure used for oil well that embodiment 1 provides.
The structure of the protector for oil pipe working under pressure used for oil well that present embodiment provides as schematically shown in Figure 3; shown among this figure also is the structure of the protector when being in original state (when namely not coming into operation); wherein; compare with the protector for oil pipe working under pressure used for oil well that embodiment 1 provides, have following difference:
In the protector for oil pipe working under pressure used for oil well that present embodiment provides, in the sealing bulb 5 track 12 is not set, and form arc (being the necking down structure) in the relevant position of embodiment 1 middle orbit 12, and become the lower end of sealing bulb 5, namely guiding device is the arc lower end of sealing bulb 5;
Stopping means is fixed on the inwall of body 2 and realizes sealing by hold-down screw 21.
Other structures of the protector for oil pipe working under pressure used for oil well that present embodiment provides are all identical with the protector for oil pipe working under pressure used for oil well that embodiment 1 provides.
The structure of the protector for oil pipe working under pressure used for oil well that present embodiment provides as schematically shown in Figure 4; shown among this figure also is the structure of the protector when being in original state (when namely not coming into operation); wherein; compare with the protector for oil pipe working under pressure used for oil well that embodiment 2 provides, have following difference:
In the protector for oil pipe working under pressure used for oil well that present embodiment provides, in the sealing bulb 5 track 12 is not set, and sealing bulb 5 forms the necking down structure of inclination in the relevant position of embodiment 1 middle orbit 12, become the lower end of sealing bulb 5, namely guiding device is the necking down structure lower end of the inclination of sealing bulb 5;
Other structures of the protector for oil pipe working under pressure used for oil well that present embodiment provides are all identical with the protector for oil pipe working under pressure used for oil well that embodiment 2 provides.
The structure of the protector for oil pipe working under pressure used for oil well that present embodiment provides as schematically shown in Figure 5; shown among this figure also is the structure of the protector when being in original state (when namely not coming into operation); wherein; compare with the protector for oil pipe working under pressure used for oil well that embodiment 3 provides, have following difference:
In the protector for oil pipe working under pressure used for oil well that present embodiment provides, the lower end of top connection 1 (being sealing surface 8) is taper, and ball sealer 4 contacts with this tapered lower end, forms sealing (the two is the line contact, and the sealing of this moment can be called linear sealing).
Other structures of the protector for oil pipe working under pressure used for oil well that present embodiment provides are all identical with the protector for oil pipe working under pressure used for oil well that embodiment 3 provides.
In the present embodiment, the protector for oil pipe working under pressure used for oil well that provides take embodiment 3 illustrates the using method of protector for oil pipe working under pressure used for oil well as example.Be respectively protector for oil pipe working under pressure used for oil well that embodiment 3 provides in original state shown in Fig. 6,7,8 and 9, Operating Pressure state, well head pressurization, ball sealer move to receives ball chamber state, the schematic diagram under the oil well production state.
As shown in Figure 6, in the original state of protector for oil pipe working under pressure used for oil well, ball sealer 4 is positioned at sealing bulb 5 tops, and spacing ball 9 part under the effect of Compress Spring 11 protrudes in the sealing bulb 5, plays the effect that ball sealer 4 moves down that limits.
As shown in Figure 7; when the connection status of protector for oil pipe working under pressure used for oil well and downhole oil tubing string 15; when namely opening the band pressure condition in shaft bottom high-pressure oil gas 19 situations; ball sealer 4 is under the effect of bottom oil-air pressure; top tight sealing face 8 makes progress; form sealing, prevention bottom oil gas upwards flows and produces blowout, just can carry out safely lower tubing string job execution.
Shown in Fig. 8 and 9, when oil well puts state into production, pressurizeed (for example: utilize hydraulic oil to pressurize by hydraulic pressure) by top connection 1 by the top production tree, when the upper pressure of oil flow channel 3 during greater than bottom pressure, ball sealer 4 is under the effect of top hydraulic pressure, move down the extruding spacing ball 9, by after continue to move down, by the sealing bulb 5, enter and receive ball chamber 6, thereby leave oil flow channel 3, oil flow channel 3 is unimpeded about making, and can carry out the normal production operation of oil well.
In the present embodiment, the various piece of oil flow channel 3 can be taked coaxial Different Diameter setting as required, and the internal diameter of sealing bulb 5 is greater than the internal diameter of the oil flow channel 3 in top connection 1 and the lower contact 14.
The screw thread of top connection 1 and lower contact 14 can be API standard oil gas thread button, top connection 1 can be connected with the tubing hanger of top well head easily, lower contact 14 is connected with tubing string 15, and tubing string 15 contacts high-pressure oil gas 19 by one way valve 16, packer 17 with Back-off Pipe String 18.After oil flow channel 3 was communicated with up and down, high-pressure oil gas 19 can successively by tubing string 15, lower contact 14, sealing bulb 5 and top connection 1 under the pressure-acting of self, then enter the oil pipe of top well head.
Certainly the present invention is not limited thereto, oil flow channel 3 described above and sealing bulb 5, and top connection 1 and lower contact 14 can be set to different-diameter according to the actual job situation.
Above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, persons skilled in the art are according to above-described embodiment detailed description of the invention, the modification of as required technical scheme of the present invention being carried out or be equal to replacement, and any modification or partial replacement that does not break away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. a protector for oil pipe working under pressure used for oil well is characterized in that, this protector for oil pipe working under pressure used for oil well comprises: body, top connection, lower contact, ball sealer, sealing bulb, receipts ball chamber and stopping means;
Described sealing bulb is positioned at described body interior, described top connection, lower contact are tubulose, wherein, top connection is threaded connection with the upper end of sealing bulb, lower contact is communicated with the lower end of sealing bulb, and, the central axis of top connection, the central axis of lower contact and the central axes that seals bulb, extend to respectively externally from up and down two ends of body, form the oil flow channel that is communicated with;
The tube wall of sealing bulb is provided with spacing hole, and described stopping means is arranged on the outer wall of sealing bulb, and protrudes in the sealing bulb by spacing hole, can shrink to ball sealer tube wall direction during its pressurized;
Ball sealer is positioned at the top connection below of sealing bulb, and be stuck in described protrude into the sealing bulb stopping means on, the diameter of ball sealer is greater than the internal diameter of top connection, less than the internal diameter of sealing bulb, and can realize sealing to oil flow channel during the lower end in contact of ball sealer and top connection;
Described receipts ball chamber is positioned at body, is respectively equipped with ball hole and ball mouth, and is communicated with the sealing bulb by ball hole, and the position of ball hole is lower than the position of stopping means; Position corresponding to ball hole in the sealing bulb is provided with guiding device, can guide the ball sealer that moves downward along the sealing bulb to enter receipts ball chamber; Receive the ball chamber and be communicated with body exterior by ball mouth, ball sealer can be left by ball mouth receive the ball chamber.
2. protector for oil pipe working under pressure used for oil well as claimed in claim 1 is characterized in that, described stopping means comprises spacing ball, Compress Spring and position-limiting tube, wherein:
Described position-limiting tube is horizontally disposed with, and an end is connected on the outer wall at spacing hole place of described sealing bulb, and the other end is fixed on the inwall of described body; Described spacing ball and Compress Spring are positioned at position-limiting tube, and the diameter of spacing ball is greater than the diameter of spacing hole, and partly protrude in the sealing bulb by spacing hole, and spacing ball is connected on the inwall of body by Compress Spring.
3. protector for oil pipe working under pressure used for oil well as claimed in claim 1 or 2 is characterized in that, described body interior is provided with at least two described stopping means, and described stopping means is positioned on the same level face, arranges with the equal angles interval.
4. protector for oil pipe working under pressure used for oil well as claimed in claim 1 is characterized in that, the outer wall of described top connection and lower contact is provided with screw thread.
5. protector for oil pipe working under pressure used for oil well as claimed in claim 4 is characterized in that, the screw thread on described top connection and the lower contact outer wall is API standard oil gas thread button.
6. protector for oil pipe working under pressure used for oil well as claimed in claim 1 is characterized in that, the lower end of described top connection is taper, forms the line contact when contacting with described ball sealer, can realize the sealing to oil flow channel.
7. protector for oil pipe working under pressure used for oil well as claimed in claim 1 is characterized in that, described ball sealer is metal ball.
8. protector for oil pipe working under pressure used for oil well as claimed in claim 1; it is characterized in that; described guiding device comprises the guide rail that is arranged in the sealing bulb, and this guide rail is downward-sloping track, and this guide rail center has the through hole that at least one fuel feeding stream passes through.
9. protector for oil pipe working under pressure used for oil well as claimed in claim 1 is characterized in that, the necking down structure of the lower end of described sealing bulb for tilting becomes described guiding device.
10. a band is depressed the method for tubing string, and it comprises:
The top connection of each described protector for oil pipe working under pressure used for oil well of claim 1-9 is connected with the tubing hanger of well head, lower contact is connected with tubing string, tubing string is installed in the oil well, make the lower end in contact oil gas of tubing string, it is inner that oil gas enters described protector by oil flow channel, and make ball sealer push up the lower end of the described top connection of pulling;
By the oil flow channel in the top connection ball sealer is applied downward pressure, force stopping means after the contraction of ball sealer tube wall direction, ball sealer is moved downward along the sealing bulb, and enter receipts ball chamber by ball hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810239399 CN101748983B (en) | 2008-12-12 | 2008-12-12 | Protector for oil pipe working under pressure used for oil well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810239399 CN101748983B (en) | 2008-12-12 | 2008-12-12 | Protector for oil pipe working under pressure used for oil well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101748983A CN101748983A (en) | 2010-06-23 |
| CN101748983B true CN101748983B (en) | 2013-01-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810239399 Active CN101748983B (en) | 2008-12-12 | 2008-12-12 | Protector for oil pipe working under pressure used for oil well |
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| Country | Link |
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| CN (1) | CN101748983B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104747121B (en) * | 2013-12-25 | 2017-07-07 | 深圳市百勤石油技术有限公司 | Casing head protective sleeve |
| CN113718877B (en) * | 2021-08-18 | 2023-03-10 | 华北水利水电大学 | Underwater sludge removing device for hydraulic engineering and working method thereof |
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|---|---|---|---|---|
| CN2243583Y (en) * | 1995-04-13 | 1996-12-25 | 陆朝强 | Highly sealed low noise one-way load reducing valve |
| CN2481929Y (en) * | 2001-05-10 | 2002-03-13 | 姚诚 | Check valve of wellhead for oil production electric immersible pump well |
| CN101037929A (en) * | 2007-04-06 | 2007-09-19 | 无锡浩安科技发展有限公司 | Well drilling blowout prevention killing well joint |
| WO2007136978A3 (en) * | 2006-05-02 | 2008-02-21 | Mako Rentals Inc | Dropping sub method and apparatus |
| CN201344008Y (en) * | 2008-12-12 | 2009-11-11 | 中国石油大学(北京) | Oil pipe snubbing operation protector for oil well |
-
2008
- 2008-12-12 CN CN 200810239399 patent/CN101748983B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2243583Y (en) * | 1995-04-13 | 1996-12-25 | 陆朝强 | Highly sealed low noise one-way load reducing valve |
| CN2481929Y (en) * | 2001-05-10 | 2002-03-13 | 姚诚 | Check valve of wellhead for oil production electric immersible pump well |
| WO2007136978A3 (en) * | 2006-05-02 | 2008-02-21 | Mako Rentals Inc | Dropping sub method and apparatus |
| CN101037929A (en) * | 2007-04-06 | 2007-09-19 | 无锡浩安科技发展有限公司 | Well drilling blowout prevention killing well joint |
| CN201344008Y (en) * | 2008-12-12 | 2009-11-11 | 中国石油大学(北京) | Oil pipe snubbing operation protector for oil well |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101748983A (en) | 2010-06-23 |
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