JP6966553B2 - Well tools including smart materials - Google Patents

Description

This application claims priority under US Patent Application No. 62 / 434,756 filed December 15, 2016 and US Patent Application No. 15 / 626,455 filed June 19, 2017. However, all the contents of the US patent application shall be incorporated.

The present disclosure relates to well tools, for example pumps such as electric submersible (submersible) pumps.

When producing a hydrocarbon reservoir, a well is drilled to the reservoir for production. When this hydrocarbon well is completed, it sometimes requires the use of tools to increase output. This tool is placed inside or outside the well. One such method of increasing output is to place an electric submersible pump (ESP) in the well.

The present disclosure relates to well tools including smart materials (high performance materials (materials)).

Certain aspects of the subject matter disclosed herein can be implemented as an electric submersible pump utilized in a well. The well pump includes a pump housing and a pump stage positioned within the pump housing, the pump stage including a fixed diffuser and a rotating impeller positioned within said diffuser, said impeller. , Rotated to provide kinetic energy for flowing fluid through the well pump, the diffuser converts the kinetic energy received from the rotating impeller to flow the fluid through the well pump into a lift. Further, the well pump is a pump head portion attached to the first end portion of the pump housing, and a compression tube attached between the pump head portion and the diffuser. The storage material includes a compression tube that increases the contact force to prevent the diffuser from rotating with the impeller and a ring-shaped storage material (shape storage material) positioned around the diffuser. It can reversibly expand from a temporary state to a permanent state according to the well operating conditions, and when the well pump is operated under the well operating conditions, it is tightened with the inner surface of the pump housing. Form a fit.

The well pump can further include a pump base attached to the second end of the pump housing. The well pump may further include a lower diffuser spacer mounted between the pump base and the diffuser. The ring-shaped storage material has an inner surface of the storage material in contact with the outer surface of the diffuser and an outer surface of the storage material separated from the inner surface of the pump housing. During the operation of the well pump under the well operating conditions, the ring-shaped storage material expands from the temporary state to the permanent state at least to the inner surface of the pump housing. In any one of the above pumps, the well operating condition includes the well operating temperature, the well pump temperature when the well pump is not operating is lower than the well operating temperature, and the ring shape is stored. The material is configured to be in the temporary state at the well pump temperature and return to the original state at the well operating temperature. In the temporary state, the width of the ring-shaped storage material along the radius of the pump housing is smaller than the thickness of the gap between the inner surface of the pump housing and the outer surface of the diffuser. .. In the permanent state, the width of the ring-shaped storage material along the radius of the pump housing is equal to the thickness of the gap. The ring-shaped storage material does not deteriorate as a temperature even if the well pump changes between the well operating temperature and the well pump assembly temperature a plurality of times, and is in the temporary state. It is possible to reversibly transition from the permanent state to the plurality of times.

The impeller is a first impeller, the diffuser is a first diffuser, and the ring-shaped storage material is a ring-shaped first storage material, the first impeller and the first diffuser. Form the first pump stage. The well pump can also include a second pump stage connected in series with the first pump stage. The second pump stage is a second impeller that rotates to provide kinetic energy for flowing fluid through the well pump and a fixed second diffuser that is positioned within the pump housing. It is positioned in the upward hole of the second impeller, receives the kinetic energy from the second impeller, and in response, lifts the kinetic energy to flow the fluid through the well pump. Includes a fixed second diffuser that converts to and a ring-shaped second storage material that is positioned around the second diffuser. The storage material reversibly expands from a temporary shape to a permanent shape according to the well operating conditions of the well pump, and before the well pump is operated in the downward hole or under the well operating conditions. A tight fit can be formed with the inner surface of the pump housing during the operation of the well pump in. The axial height of the ring-shaped first storage material along the vertical axis of the pump housing is the same as the axial height of the ring-shaped second storage material along the vertical axis of the pump housing. Or different. The storage material forms a tight fit that is strong enough to prevent the diffuser from rotating. The radial thickness of the diffuser at the location where the ring-shaped storage material is positioned is greater than the radial thickness of the diffuser at other positions along the longitudinal axis of the pump housing. The ring-shaped storage material has an axial height along the vertical axis of the pump housing, and the axial height is based on the wall thickness of the diffuser.

Certain aspects of the subject matter disclosed herein can be practiced as a method. Assemble the well pump stage of the well pump. The well pump stage is positioned in a pump housing with a rotating impeller configured to rotate to provide kinetic energy to flow fluid through the well pump and into the upward hole of the impeller. Includes a fixed diffuser that is positioned to receive the kinetic energy from the impeller and, in response, convert the kinetic energy into a lift for flowing the fluid through the well pump. The pump head portion is attached to the upward hole end portion of the pump housing. A compression tube is attached between the pump head portion and the diffuser. The compression tube increases the contact force between the diffusers. The inner surface of the pump housing and the outer surface of the diffuser are separated by a gap. The storage material is formed in a ring shape having an inner diameter equal to or larger than the outer diameter of the diffuser and having an outer diameter smaller than the inner diameter of the pump housing. The ring-shaped storage material is placed around the outer diameter of the diffuser. Forming the storage material in the ring shape means that the outer diameter of the storage material is the inner diameter of the pump housing from a permanent state in which the outer diameter of the storage material is equal to or larger than the inner diameter of the pump housing. It involves deforming the ring-shaped storage material to a smaller temporary state. The storage material is harder in the permanent state than in the temporary state. The storage material is in the temporary shape at the time of assembly before being installed in the down hole, and at the well pump temperature when the well pump is positioned in the down hole in the well and is not operating. It is in a permanent state. The storage material is in the permanent state at the well operating temperature when the well pump is positioned and operating in a downhole in the well. Forming the storage material in the ring shape is a temporary state without deterioration even if the temperature of the well pump changes between the well operating temperature and the well pump assembly temperature a plurality of times. It involves forming the storage material so that it reversibly transitions from the permanent state multiple times. The ring-shaped storage material is positioned at a certain position. The radial thickness of the diffuser at the position where the ring-shaped storage material is positioned is greater than the radial thickness of the diffuser elsewhere along the longitudinal axis of the pump housing.

The well pump stage is a first well pump stage, the impeller is a first impeller, the diffuser is a first diffuser, and the storage material is a first storage material. Assemble the second well pump stage of the well pump. The second well pump stage is positioned within the pump housing with a rotating second impeller that rotates to supply kinetic energy for flowing fluid through the well pump, said second. Includes a fixed second diffuser positioned in the upward hole of the impeller. The second diffuser receives the kinetic energy from the second impeller and in response converts the kinetic energy into a head for flowing the fluid through the well pump. The second storage material is formed in a ring shape having an inner diameter equal to the outer diameter of the diffuser and an outer diameter smaller than the inner diameter of the pump housing. The ring-shaped second storage material is positioned around the outer diameter of the second diffuser. The first well pump stage is mounted in series with the second well pump stage.

Certain aspects of the subject matter disclosed herein can be implemented as a downhaul pump. The downhaul pump is positioned in the pump housing with a pump housing, an impeller that rotates to provide kinetic energy for flowing fluid through the well pump, and an upward hole in the impeller, from the impeller. Attached to the first end of the pump housing with a fixed diffuser that receives the kinetic energy and in response converts the kinetic energy into a lift for flowing the fluid through the well pump. It is attached between the pump head portion, the pump base portion attached to the second end portion of the pump housing, and the pump head portion and the diffuser, and prevents the diffuser from rotating together with the impeller. A compression tube that increases the contact force between the diffuser for this purpose, a lower diffuser spacer attached between the pump base and the diffuser, and a ring-shaped storage material positioned around the diffuser. Can include. The storage material can be reversibly expanded from a temporary state to a permanent state depending on the well operating conditions of the well pump. The storage material has lower rigidity in the temporary state than in the permanent state.

In the permanent state, the storage material forms a tight fit between the diffuser and the pump housing. The tightening fit has the strength to prevent the rotation of the diffuser. The storage material can be expanded from the temporary state to the permanent state depending on the well operating conditions in which the well pump operates in the downhole in the well. The storage material shrinks from the permanent state to the temporary state in response to changes in the well operating conditions. The well operating condition can include a well operating temperature at which the well pump operates in a downhole in the well. The storage material remains in the temporary state when the well pump temperature is lower than the well operating temperature, and expands to the original state when the well pump temperature is equal to or higher than the well operating temperature. ..

Details of one or more implementations of the present invention will be described in the accompanying drawings and the following description. Other features, objects and advantages of the invention will become apparent from the specification and drawings as well as the claims.

It is a schematic diagram of a part of an electric submersible pump having a rotation blocking ring installed in a well and having a temporary shape.

It is a schematic diagram of a part of an electric submersible pump having a rotation blocking ring installed in a well and having a permanent shape.

It is a schematic diagram of a part of an electric submersible pump installed in a well and having two stages.

It is a schematic diagram of a shape memory polymer rotation prevention band.

It is a flowchart of an exemplary method for utilizing a shape memory polymer in a component of equipment in a downhaul.

Similar reference numerals in the various drawings indicate similar components.

The electric submersible (submersible) pump (ESP) system consists of a centrifugal pump, a protective device, a motor, and a monitoring subsystem. Pumps are used to lift well fluids to the surface. The motor supplies the energy to drive the pump. The protective device absorbs the thrust load from the pump, transfers power from the motor to the pump, and prevents well fluid from entering the motor. The monitoring subsystem provides information on the characteristics of the well fluid, such as pump suction and discharge pressures, pump suction temperature, motor internal temperature, and vibration, to name a few. The pump is composed of multiple stages (stages), and each stage is composed of an impeller and a diffuser. The impeller spins and gives energy to the fluid to make it flow, and the diffuser is fixed and converts the kinetic energy of the fluid from the impeller into a head. Typically, multiple pump stages are stacked in series to form a multi-stage system. All stages are housed in a pump housing, both ends of which are covered with a pump head and a pump base. The sum of the heads generated in each stage is cumulative. That is, the total head obtained by the multi-stage system increases linearly from the first stage to the last stage. ESP operates in the production well.

One of the steps taken when assembling the ESP pump is the compression of the diffuser. This step is done to ensure that the stacked diffusers or steps remain in contact with each other and prevent rotation during operation. In this step, the compression tube is first cut to a size based on the required total diffuser compression and sandwiched between the pump head and the final diffuser in the uppermost stage to obtain the desired compressive force. .. During pump operation, the impeller transfers torque to the fluid, which torque is transmitted to the walls of the diffuser. However, sometimes the pressure-based force from the diffuser outweighs the diffuser compressive force due to improper compression during assembly or an unexpected lift generated under certain flow conditions. When all the compressive force is lost, the diffuser rotates in the same direction as the impeller, resulting in what is known as a spinning diffuser. As a result, the produced fluid escapes into the annular space between the inner diameter of the housing and the outer diameter of the diffuser, and this escaped high pressure fluid exerts unnecessary stress on the diffuser wall, which leads to pump failure. May lead to crushing. Moreover, the lift formed by the spinning diffuser is inadequate. The diffuser can rub against the contact surface with other diffusers, or the outer diameter of the diffuser can rub against the inner wall of the housing. As a result, material loss occurs in both the diffuser and the housing, which causes excessive heat due to friction and leads to premature failure of the pump.

Traditional pump assembly relies on high compressive forces to ensure sufficient frictional contact between the diffusers to prevent the diffusers from spinning. This favors the spinning diffuser effect, as the pump conditions fluctuate considerably during operation. Therefore, supplementary diffuser spinning prevention technology has been implemented. That is, the sub-compression device, which may be a spring member, is attached together with the main compression device. This combination allows the spring member to act as the main compressor and keep the diffusers in contact with each other if the main compressor loses its compressive capacity. The expected disadvantage of such a configuration is due to the relaxation of the spring after multiple actuations. When this happens, the function of the spring member is lost, causing a spinning diffuser effect.

In another detent technique, each diffuser has axially extending protrusions, which are nested along the corresponding recesses formed along the diffuser and positioned axially, relative to the diffuser. Stop exercising. Further, an O-ring is mounted on the outside of each diffuser so as to form a seal in the mating surface of each protrusion and recess. At the top of the stack, a retaining ring is attached to the recess in the housing to mechanically secure the diffuser to the housing and prevent its rotation. One disadvantage of this technique is the increased machining required to form protrusions and recesses in the diffuser, resulting in longer manufacturing times and higher product or equipment costs.

Another detent technique includes a variable compressor or variable compression ring, which can be plastic or hard rubber placed between the compression tube and the top diffuser. If the cut compression tube is too short, the variable compression ring expands to maintain the compressive load required by the diffuser to prevent the diffuser from spinning during pump operation. Conversely, if the cut compression tube is too long, the variable compressor contracts to prevent the diffuser from spinning to maintain the desired compressive load on the diffuser. One of the possible disadvantages of this method is that the hard rubber or plastic exhibits compressive permanent strain after multiple expansions and compressions, thereby losing its effectiveness, and as a result, the material resembles conventional assembly methods. It is more susceptible to the spinning diffuser effect.

The present disclosure describes a rotation blocking device (anti-rotation device) made of a shape memory polymer (SMP) or other similar shape memory material and used in an ESP also known as a well pump. The shape of the SMP is a ring that fits snugly around the ESP diffuser. The SMP is configured to expand at the operating temperature of the well to create a tight fit between the ESP diffuser and the ESP housing. The SMP is configured to expand at the well operating temperature rather than the pump operating temperature, because the SMP material expands before the pump starts to produce a tight fit. By tightening, a rotation blocking force is obtained through high frictional resistance. SMPs are used alone, in combination with compression tubes, or in combination with other structural devices used to prevent rotation.

FIG. 1A shows a portion of an assembled ESP 100 having a rotation blocking band 108 in a temporary shape. The ESP 100 can include a plurality of pump stages (the first pump stage 126 is shown as an example, and other pump stages may be the same), and each of the plurality of pump stages has an impeller (for example, a first pump stage). 1 impeller 118) and a diffuser (eg, diffuser 112a) are included. A plurality of stages may be collectively referred to as a pump bundle 116. The pump bundle 116 is housed in the housing 114. The housing 114 has two ends, that is, an upward hole end (up hole end) 128 and a downward hole end (down hole end) 130. The pump head portion 102 is attached to the upward hole end portion 128 of the housing 114. The compression pipe 104 is arranged between the pump head portion 102 and the diffuser 112b of the pump stage closest to the upward hole end portion 128. The compression tube 104 provides compressive force to prevent the diffuser 112b in the pump stage closest to the upward hole end 128 from spinning (rotating). The pump bundle 116 has two ends, namely a suction end 122 and a discharge end 106. The diffuser 112a in the pump stage closest to the suction end 106 is supported by the pump base 134.

The ESP 100 is a suction end 122 arranged below the discharge end 106, and takes in the produced fluid from the well. The discharge end 106 sends the output fluid into the production conduit (not shown) and in the upward hole direction towards the above-ground facility. In the implementation shown in FIGS. 1A and 1B, the diffuser 112b closest to the upward hole end 128 is directly above (ie, downstream) of the impeller 118. At the same time that the produced fluid moves in the ESP100, the heads added for each stage are accumulated.

The plurality of stages 116 are arranged in the housing 114 at the time of assembly. At the upward hole end 128 of the housing 114, the ESP 100 is held in the housing 114 via the pump head 102. At the downward hole end 130 of the housing 114, the plurality of steps 116 are in contact with the lower diffuser spacer 132. The lower diffuser spacer is secured by a pump base 134 screwed to the downward hole end 130 of the housing 114 to keep the pump bundle 116 in a compressed state. The uninflated SMP rotation blocking band 108 is in a temporary shape and is arranged around each diffuser in each pump stage.

SMP is a polymer that can change from a temporary shape to its permanent shape in the presence of external stimuli such as temperature. Another property of shape memory materials is the bidirectional shape memory effect. This is the ability to memorize the shape of the shape storage material when it is heated to a high temperature and to memorize its shape when it is cooled to a low temperature. SMPs are characterized by a glass transition temperature T _g and are hard below that temperature. If it is less than T _g , the shape of the SMP is temporary. When the shape memory material is heated to exceed Tg, it returns to a permanent shape. This process is reversible and can be repeated many times without breaking down the polymer. In addition, the polymer can be engineered to have a particular glass transition temperature, eg, a temperature between −22 ° F. (-30 ° C.) and 500 ° F. (260 ° C.). The SMP is first machined with the intention of its desired permanent shape by conventional manufacturing methods including molding and curing, and then processed into the desired temporary shape. This is achieved by heating the manufactured permanent shape above the glass transition temperature (T _{g) of the SMP.} Subsequently, a load is applied to the SMP to deform the SMP into a target temporary shape. _{Temporarily shaped SMPs are cooled to below their glass transition temperature (T g} ), typically near room temperature, while remaining loaded / constrained. After reaching room temperature, the SMP maintains this temporary shape even when the load / restraint is released. The shape of the unexpanded rotation blocking band 108 during the assembly process is this temporary shape. In the case of an SMP intended and manufactured with a one-way shape memory effect, the SMP transforms into its permanent shape when the temporary shape is heated to a temperature above the glass transition temperature of the SMP. In the case of an SMP intended and manufactured with a bidirectional shape memory effect, the SMP transforms into its permanent shape when the temporary shape is heated to a temperature above the glass transition temperature of the SMP. However, when the SMP is cooled below its glass transition temperature, the SMP returns to its temporary shape.

FIG. 1B shows the same portion of the installed ESP100 shown in FIG. 1A. However, here the inflated SMP rotation blocking band 110 is in permanent shape. The temporary shape of the uninflated SMP rotation blocking band 108 is tightly fitted around the pump diffuser 112a and the diffuser 112b. The outer surface of the uninflated rotation blocking band 108 mounted around the diffuser 112a and the diffuser 120b has sufficient clearance between it and the inner wall of the housing 114 for ease of mounting. The rotation blocking band 108 is an SMP manufactured by utilizing the bidirectional shape memory effect. In its temporarily unexpanded shape, the rotation blocking band 108 is from an inner diameter equal to the outer diameter of the pump bundle 116 (within normal press-fitting tolerances) and a gap between the outer surface of the pump bundle 116 and the inner surface of the housing 114. A ring with a small radial thickness. The glass transition temperature (T _g ) of the SMP is set before mounting so that it is higher than the temperature incurred during assembly and mounting, but lower than the operating temperature of the well. The permanent shape of the inflated SMP rotation blocking band 110 is configured to provide a tight fit between the outer diameter of the inflated SMP rotation blocking band 110 and the inner diameter of the housing 114. That is, in a permanent inflated shape, the inner diameter of the ring is equal to the outer diameter of the pump bundle (within the standard machining tolerances of the press-fitted parts) and the radial thickness is the outer surface of the diffuser 112a and the diffuser 112b and the housing 114. At least equal to the gap between the inner surface of the. This tightening works in conjunction with the compression tube 104 to provide a frictional force that resists any rotation of the pump diffuser. When the pump is removed from the well and the SMP temperature _{drops below the glass transition temperature (T g} ), the SMP band returns to a temporary state.

Depending on the implementation, multiple stages may be used within the pump bundle 116. In such an implementation, as shown in FIG. 1C, the ESP can include, for example, a first stage 126a and a second stage 126b. Each pump stage 126 may include a temporary shaped rotation blocking band 108 that is worn during pump assembly. As previously described, the transiently shaped anti-rotation band 108 expands to its permanent shape when the ESP100 is in the well and is exposed to temperatures above the glass transition temperature (T _g). It becomes the SMP rotation blocking band 110.

FIG. 2 shows a top view of the comprehensive SMP rotation blocking band 200. The SMP rotation blocking band 200 has a ring-shaped temporary shape for easy mounting. As mentioned earlier, the temporary shape of the SMP rotation blocking band 200 is pre-manufactured so that its inner surface matches the outer surface of the pump bundle 116, while the outer diameter of the band 200 is the inner surface of the pump housing 114. Is less than the diameter of. In general, the permanent shapes of the outer and inner surfaces of the anti-rotation band 200 can be formed to match the inner surface of the pump housing 114 and the outer surface of the pump bundle 116, respectively. The glass transition temperature (T _g ) of the rotating band 200 is planned in advance so as to be lower than the operating temperature of the well pump 100 in the well and higher than the temperature of the well pump 100 at the time of assembly. The well temperature is warmer than the temperature incurred during assembly.

The axial arrangement of the uninflated SMP rotation blocking band 108 in the temporary shape is ideally around the diffuser 112a and the diffuser 112b of the pump bundle 116, where the radial thickness of the diffuser is It will be the maximum. When placed around the thin wall portion of the pump bundle 116, the expanded SMP rotation blocking band 110 may crush the diffuser 112a or the diffuser 112b. The specific temporary (uninflated) and permanent (inflated) shapes of the anti-rotation band 200 are manufactured in different sizes for each ESP100 model due to dimensional differences. The SMP rotation blocking band 200 can be attached to one or more diffusers at various longitudinal heights.

This subject can be carried out using the exemplary method 300 shown in FIG. The steps of method 300 can be performed in parallel, sequentially, or in a different order than that shown in FIG. First, take out the pump base from the inventory. In step 302, the lower diffuser spacer 132 is attached to the pump base 134. The pump base 134 is then attached to the housing 114 or the pump base 134 is set aside until the pump stage 126 is complete. At that point, the pump stage is connected to the lower diffuser spacer 132. Before that can happen, in step 304, the well pump stage 126 of the well pump 100 is assembled. This step of assembling the pump stage can include placing the impeller 118 within the first diffuser 120. In step 306, the storage material is formed into a ring shape having an inner diameter equal to the outer diameter of the diffuser 120 of the pump stage 126 previously assembled and having an outer diameter smaller than the inner diameter of the pump housing 114. In step 308, the ring shape storage material is placed (positioned) around the outer diameter of the diffuser 120. The storage material is arranged around the diffuser 120 in its unexpanded or temporary shape. In step 310, the second well pump stage of the well pump is assembled. In step 312, the second storage material is formed into a ring shape having an inner diameter equal to the outer diameter of the diffuser of the pump stage assembled in step 310 and having an outer diameter smaller than the inner diameter of the pump housing 114. In step 314, a ring-shaped second storage material is placed around the outer diameter of the diffuser in the second pump stage. The storage material is placed around the second diffuser in its unexpanded or temporary shape. In step 316, the first well pump stage 126a is attached in series with the second pump stage 126b to form the pump bundle 116. At step 318, the pump bundle 116 is inserted into the pump housing 114. In step 320, the compression pipe 104 is attached between the pump bundle 116 and the pump head portion 102. In step 322, the pump head portion 102 is attached to the upward hole end portion 128 of the pump housing 114. The pump head portion 102 and the pump base portion 134 can be attached to the pump housing by screw connection.

Some implementations of this subject have been described. Nevertheless, it will be understood that various modifications are possible without departing from the gist and scope of this subject. For example, shape memory alloys may be used instead of SMP. Therefore, other practices are included in the claims below.

100 ESP (Electric submersible (in liquid) pump)
102 Pump head 104 Compression pipe 108, 110 Rotation blocking band 112a, 112b Diffuser 114 Housing 118 Impeller 126 Pump stage 132 Lower diffuser spacer 134 Pump base

Claims (21)

Well pump:
With a pump housing having a first end and a second end;
A pump stage positioned within the pump housing, comprising a fixed diffuser and a rotating impeller positioned within the diffuser;
The impeller is configured to rotate to provide kinetic energy to flow the fluid through the well pump, and the diffuser is received from the rotating impeller to flow the fluid through the well pump. It is configured to convert the kinetic energy into a pump;
The well pump further comprises a pump head portion attached to the first end of the pump housing;
A compression tube attached between the pump head and the diffuser, which increases the contact force between the pump head and the diffuser to prevent the diffuser from rotating with the impeller. With a compression tube configured to;
With a ring-shaped storage material positioned around the outer diameter of the diffuser;
The storage material reversibly expands from a temporary state to a permanent state according to the well operating temperature of the well pump, and the pump is operated when the well pump is operated at the well operating temperature. The ring-shaped storage material is configured to form a tight fit with the inner surface of the housing and is positioned along the longitudinal axis of the pump housing to maximize the radial thickness of the diffuser. Has been;
Well pump. Further comprising a pump base attached to the second end of the pump housing.
The well pump according to claim 1. The diffuser is a first diffuser positioned between the first end of the pump housing and the impeller;
With a second diffuser positioned between the second end of the pump housing and the impeller;
Further comprising a lower diffuser spacer attached between the pump base and the second diffuser;
The well pump according to claim 2. The ring-shaped storage material has an inner surface of the storage material in contact with the outer surface of the diffuser and an outer surface of the storage material separated from the inner surface of the pump housing, and the well pump at the well operating temperature. At the time of the operation, the ring-shaped storage material is configured to expand from the temporary state to the permanent state at least to the inner surface of the pump housing.
The well pump according to claim 1. The well pump assembly temperature is lower than the well operating temperature, and the ring-shaped storage material is in the temporary state at the well pump assembly temperature and returns to the permanent state at the well operating temperature. Is configured to
The well pump according to claim 1. The ring-shaped storage material has the temporary state and the permanent state without deterioration even if the temperature of the well pump changes between the well operating temperature and the well pump assembly temperature a plurality of times. It is configured to reversibly transition to and from the above-mentioned multiple times.
The well pump according to claim 5. In the temporary state, the width of the ring-shaped storage material along the radius of the pump housing is smaller than the thickness of the gap between the inner surface of the pump housing and the outer surface of the diffuser, and is permanent. In the state, the width of the ring-shaped storage material along the radius of the pump housing is equal to the thickness of the gap.
The well pump according to claim 1. The impeller is a first impeller, the diffuser is a first diffuser, and the ring-shaped storage material is a ring-shaped first storage material, the first impeller and the first diffuser. Formed a first pump stage, the well pump further comprises a second pump stage connected in series with the first pump stage, the second pump stage being:
With a rotating second impeller configured to rotate to provide kinetic energy to flow fluid through the well pump;
A second diffuser fixed positioned within the pump housing, is positioned above the second impeller, receive the kinetic energy from the second impeller, and the response motion With a fixed second diffuser that converts energy into a head for flowing the fluid through the well pump;
A ring-shaped second storage material positioned around the second diffuser, which reversibly expands from a temporary shape to a permanent shape according to the well operating temperature of the well pump. and, a second memory member of ring-shaped and configured to form an interference fit between said inner surface of said pump housing during operation of the well pump in front Kianai operating temperature With;
The well pump according to claim 1. The axial height of the ring-shaped first storage material along the vertical axis of the pump housing is the same as the axial height of the ring-shaped second storage material along the vertical axis of the pump housing. Or different,
The well pump according to claim 8. The storage material is configured to form a tight fit that is strong enough to prevent the diffuser from rotating.
The well pump according to claim 1. The ring-shaped storage material has an axial height along the vertical axis of the pump housing, and the axial height is based on the wall thickness of the diffuser.
The well pump according to claim 1. With steps to assemble the well pump stage of the well pump
The well pump stage
A rotating impeller configured to rotate to provide kinetic energy for flowing fluid through the well pump,
Is positioned within the pump housing, is positioned above the impeller, receive the kinetic energy from the impeller, and the kinetic energy in response, into a lift for flowing said fluid through said wellbore pump , With a fixed diffuser;
Further, with the step of attaching the pump head portion to the upward hole end portion of the pump housing;
The inner surface of the pump housing and the outer surface of the diffuser are separated by a gap, and the compression pipe between the pump head portion and the diffuser increases the contact force between the pump head portion and the diffuser. With the step of installing a compression tube configured to allow;
With the step of forming the storage material into a ring shape having an inner diameter equal to or larger than the outer diameter of the diffuser and having an outer diameter smaller than the inner diameter of the pump housing;
The ring-shaped storage material is provided with a step of arranging the ring-shaped storage material around the outer diameter of the diffuser at a position along the vertical axis of the pump housing where the thickness in the radial direction of the diffuser is maximized.
Method. The step of forming the storage material into the ring shape is from a permanent state in which the outer diameter of the storage material is equal to or larger than the inner diameter of the pump housing, and the outer diameter of the storage material is the inner diameter of the pump housing. The ring-shaped storage material is provided with a step of deforming the ring-shaped storage material to a smaller temporary state, and the storage material is harder in the permanent state than in the temporary state.
The method according to claim 12. The storage material is in the temporary state at the time of assembly before being installed in the down hole, and at the well pump temperature when the well pump is positioned in the down hole in the well and is not operating. It is in a permanent state and is in the permanent state at the well operating temperature when the well pump is positioned and operating in a downhole in the well.
13. The method of claim 13. The step of forming the storage material into the ring shape is the temporary state without deterioration even if the temperature of the well pump changes a plurality of times between the well operating temperature and the well pump assembly temperature. A step of forming the storage material so as to reversibly transition from the permanent state a plurality of times is provided.
13. The method of claim 13. The well pump stage is a first well pump stage, the impeller is a first impeller, the diffuser is a first diffuser, and the storage material is a first storage material.
A rotating second impeller configured to rotate to supply kinetic energy for flowing fluid through the well pump.
A second diffuser fixed positioned within said pump housing, said positioned above the second impeller, said receiving the kinetic energy from the second impeller, and the kinetic energy in response With a step of assembling a second well pump stage in the well pump, comprising a fixed second diffuser configured to convert the fluid into a lift for flowing the fluid through the well pump. ;
With the step of forming the second storage material into a ring shape having an inner diameter equal to the outer diameter of the second diffuser and having an outer diameter smaller than the inner diameter of the pump housing;
With the step of positioning the ring-shaped second storage material around the outer diameter of the second diffuser;
Further comprising: mounting the first well pump stage in series with the second well pump stage;
The method according to claim 12. Well pump:
With a pump housing having a first end and a second end;
With a rotating impeller configured to rotate to provide kinetic energy to flow fluid through the well pump;
Wherein said first end portion of the pump housing is positioned in said pump housing between the impeller is positioned above the impeller, receive the kinetic energy from the impeller, and, wherein in response With a fixed first diffuser configured to convert kinetic energy into a lift for flowing the fluid through the well pump;
With the pump head portion attached to the first end of the pump housing;
With the pump base attached to the second end of the pump housing;
With a second diffuser positioned between the second end of the pump housing and the impeller;
A compression tube attached between the pump head portion and the first diffuser, the pump head portion and the first diffuser in order to prevent the first diffuser from rotating with the impeller. With a compression tube configured to increase contact force with;
With a lower diffuser spacer attached between the pump base and the second diffuser;
A ring-shaped first storage material positioned around the outer diameter of the first diffuser, which is reversible from a temporary state to a permanent state depending on the well operating temperature of the well pump. Along the vertical axis of the pump housing, which is configured to expand to, the temporary state is less rigid than the permanent state, and the radial thickness of the first diffuser is maximum. With a ring-shaped first storage material positioned in position;
A ring-shaped second storage material positioned around the outer diameter of the second diffuser, which is reversible from a temporary state to a permanent state depending on the well operating temperature of the well pump. configured to expand into the permanent the transient condition of it is less rigid than the state, along the longitudinal axis of the pump housing where the thickness of the radial direction of the second diffuser is maximum With a ring-shaped second storage material positioned in position;
Well pump. In the permanent state, the first storage material is configured to form a tight fit between the first diffuser and the pump housing that has the strength to prevent the rotation of the first diffuser. The second storage material is configured to form a tight fit between the second diffuser and the pump housing that has the strength to prevent the second diffuser from rotating. ,
The well pump according to claim 17. The first storage material and the second storage material expand from the temporary state to the permanent state according to the operating temperature of the well in which the well pump operates in the down hole in the well. Is configured to
The well pump according to claim 17. The first storage material and the second storage material are configured to shrink from the permanent state to the temporary state in response to a change in the operating temperature of the well.
The well pump according to claim 17. The first storage material and the second storage material remain in the temporary state when the well pump temperature is lower than the well operating temperature, and the well pump temperature is equal to or higher than the well operating temperature. It is configured to inflate to the permanent state at one time,
The well pump according to claim 17.

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