CN114439419A - Sand prevention sliding sleeve - Google Patents
Sand prevention sliding sleeve Download PDFInfo
- Publication number
- CN114439419A CN114439419A CN202011227190.2A CN202011227190A CN114439419A CN 114439419 A CN114439419 A CN 114439419A CN 202011227190 A CN202011227190 A CN 202011227190A CN 114439419 A CN114439419 A CN 114439419A
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- Prior art keywords
- sand control
- sleeve mechanism
- sleeve
- sliding sleeve
- control sliding
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- 239000004576 sand Substances 0.000 title claims abstract description 49
- 230000002265 prevention Effects 0.000 title description 2
- 230000007246 mechanism Effects 0.000 claims abstract description 59
- 238000007789 sealing Methods 0.000 claims description 17
- 230000013011 mating Effects 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005065 mining Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The invention relates to a sand-proof sliding sleeve, which comprises: a first sleeve mechanism configured with an external channel; the second sleeve mechanism comprises a cylindrical main body and a sand control channel arranged on the side wall of the cylindrical main body; when oil and gas are produced, the external channel is opened, and the second sleeve mechanism is put into the first sleeve mechanism, so that the sand control channel is opposite to and communicated with the circulation channel. The sand control sliding sleeve can avoid blockage of a shaft.
Description
Technical Field
The invention relates to the technical field of well completion, in particular to a sand-proof sliding sleeve.
Background
The open hole staged fracturing well completion process is one of the means for the efficient development of compact oil and gas reservoirs. Compared with the casing staged fracturing well completion, the contact area between a production layer and an oil gas production channel in the open hole staged fracturing well completion process is larger, and oil gas seepage channels are more.
However, open hole wells are prone to problems such as sand production and well wall collapse during oil and gas production. This can result in sand and other borehole wall sloughs being produced into the wellbore with the hydrocarbons. Over time, sand and other wall sloughs entering the wellbore tend to cause plugging of the wellbore, resulting in inefficient oil and gas recovery. In addition, the method also causes great trouble to the later oil and gas well management and maintenance.
It is therefore desirable to provide a device that avoids plugging of the wellbore.
Disclosure of Invention
In order to solve the problems, the invention provides a sand-proof sliding sleeve which is beneficial to avoiding the problem of blockage of a shaft.
According to the present invention, there is provided a sand control sliding sleeve, comprising: a first sleeve mechanism configured with an external channel; the second sleeve mechanism comprises a cylindrical main body and a sand control channel arranged on the side wall of the cylindrical main body; when oil and gas are produced, the external channel is opened, and the second sleeve mechanism is put into the first sleeve mechanism, so that the sand control channel is opposite to and communicated with the circulation channel.
Through using above-mentioned sand control sliding sleeve in the pit shaft, can be when exploitation oil gas for oil gas in the stratum enters into the pit shaft through outside passageway and sand control passageway. Through the setting of sand control passageway, can avoid sand and other wall of a well collapses the thing and enter into the pit shaft in, and then can avoid the pit shaft to block up, the inefficiency scheduling problem is gathered to oil gas.
In one embodiment, the first sleeve mechanism comprises: the side wall of the outer barrel is provided with an external channel which penetrates through the side wall of the outer barrel along the radial direction, and the inner barrel is sleeved in the outer barrel; in an initial state, the main body of the inner tube overlaps the outer passage to close the outer passage, and the main body of the inner tube is displaced from the outer passage by moving the inner tube downward in the axial direction relative to the outer tube to open the outer passage.
In one embodiment, the second sleeve mechanism comprises a sealing ball arranged within the cylindrical body, the sealing ball sealing off an inner space of the cylindrical body during run-in of the second sleeve mechanism.
In one embodiment, the sealing ball is configured to dissolve to enable drainage from the well by retrograde drainage after the second sleeve mechanism is run into place.
In one embodiment, a boosting assembly is embedded on the outer side of the cylindrical body, and the boosting assembly is configured to reduce a gap between the outer side wall of the cylindrical body and the inner side wall of the inner cylinder and/or the inner side wall of the shaft for the second sleeve mechanism to pass through during the running-in process of the second sleeve mechanism.
In one embodiment, the boost assembly includes a resilient unit, at least a portion of which projects radially outward relative to an outer sidewall of the cylindrical body.
In one embodiment, the boost assembly comprises a plurality of resilient elements stacked on top of each other in the axial direction, the plurality of resilient elements being independent with respect to each other.
In one embodiment, the elastic unit is configured as an elastic ring surrounding the cylindrical body, and the elastic ring has a cross section configured such that an intermediate portion is offset in an axially downward direction with respect to an edge portion.
In one embodiment, the resilient element is made of cloth-sandwiched rubber.
In one embodiment, the inner barrel is configured with a mating detent on an inner side thereof, and the second sleeve mechanism is configured with a mating detent extending downwardly from the tubular body, the mating detent being snappable into the mating detent to fix the position of the second sleeve mechanism relative to the first sleeve mechanism.
Compared with the prior art, the invention has the advantages that: through using above-mentioned sand control sliding sleeve in the pit shaft, can be when exploitation oil gas for oil gas in the stratum enters into the pit shaft through outside passageway and sand control passageway. Through the setting of sand control passageway, can avoid sand and other wall of a well collapses the thing and enter into the pit shaft in, and then can avoid the pit shaft to block up, the inefficiency scheduling problem is gathered to oil gas.
Drawings
The invention is described in more detail below with reference to the accompanying drawings. Wherein:
FIGS. 1-3 illustrate the operation of a sand control sliding sleeve according to one embodiment of the present invention;
FIG. 4 shows a close-up view of a boosting assembly in a sand control sliding sleeve according to one embodiment of the present invention.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in FIG. 1, the sliding sleeve 100 includes an outer barrel 120 and an inner barrel 130 disposed within the outer barrel 120. As also shown in FIG. 1, the slip 100 further includes an upper sub 110 connected at the upper end of the outer barrel 120 for connection with an upper wellbore portion. The lower end of the joint 110 is inserted into the outer cylinder 120 and is screw-coupled with the outer cylinder 120. The outer cylinder 120, the inner cylinder 130, and the upper joint 110 are included in the first sleeve mechanism of the present invention.
Figure 1 schematically illustrates a first state (initial state) of the sliding sleeve 100. In this state, the upper end of the inner cylinder 130 abuts against the lower end of the upper joint 110. The inner cylinder 130 and the outer cylinder 120 can be connected by a shear pin or a snap spring, for example, to ensure that the positions of the inner cylinder 130 and the outer cylinder 120 and the upper joint 110 are fixed relative to each other. As shown in fig. 1, an outer passage 121 penetrating the sidewall of the outer cylinder 120 in the radial direction is formed on the sidewall of the outer cylinder 120. In the first state, the outer channel 121 is covered by the body of the inner barrel 130, or overlaps the body of the inner barrel 130, such that the outer channel 121 can be closed by the body of the inner barrel 130. In this first state, the external passage 121 cannot communicate between the space inside and outside the sliding sleeve 100, that is, the space outside the outer cylinder 120 and the space inside the inner cylinder 130.
In the first state described above, the sleeve 100 may be run into the well with the remainder of the wellbore, with the sleeve 100 in the desired position, opposite the reservoir.
After running, the sliding sleeve 100 can be transitioned from the first state shown in FIG. 1 to the second state (i.e., the fracturing state) shown in FIG. 2.
In this second state, the inner cylinder 130 moves axially downward relative to the outer cylinder 120 until the upper end of the inner cylinder 130 is below the outer passage 121. Thus, the body of the inner cylinder 130 no longer covers the external passage 121, and the external passage 121 can directly communicate the inner and outer spaces of the sliding sleeve 100.
For example, corresponding fracturing gullets (not shown) are configured on the inside of the inner barrel 130. For example, a frac switch tool may be run in, engaged with a frac gullet, and depressed by a hold pressure or the like. Thereby, the inner cylinder 130 is driven to move axially downward relative to the outer cylinder 120.
As shown in fig. 2, an upward facing step surface 122 is formed inside the outer tube 130. The step surface 122 is opposite to the lower end of the inner cylinder 130, and can be used to limit the axial downward movement of the inner cylinder 130. Thus, in the second state, the inner cylinder 130 can be moved axially downward until the lower end of the inner cylinder 130 abuts against the step surface 122. Thus, the distance between the step surface 122 and the outer passage 121 is preferably greater than the total length of the inner tube 130.
In the second state, fracturing fluid may be delivered to the reservoir through the external passageway 121 of the sliding sleeve 100 to effect fracturing.
After completion of the fracturing operation, the sliding sleeve 100 may transition from the second state shown in FIG. 2 to the third state shown in FIG. 3.
As shown in fig. 3, the sliding sleeve 100 further includes a second sleeve mechanism 140, and a sand control passage 143A is constructed on a sidewall of the second sleeve mechanism 140.
In the third state, the second sleeve mechanism 140 is lowered into the first sleeve mechanism through the wellbore, and the external passage 121 is opposite to and in communication with the sand control passage 143A, thereby allowing hydrocarbon resources in the reservoir to enter the internal space of the sliding sleeve 100 (i.e., the second sleeve mechanism 140) through the external passage 121 and the sand control passage 143A and be transported to the surface through the wellbore. The sand control passage 143A may effectively filter out sand and other borehole wall sloughs carried in the hydrocarbon resources while allowing only (or substantially only) hydrocarbon to enter the sliding sleeve 100.
The specific structure of one embodiment of the second sleeve mechanism 140 will be described in detail below with reference to fig. 3 and 4.
The second sleeve mechanism 140 includes a cylindrical body. The cylindrical body includes a cylindrical first body part 143, and a sand control passage 143A is opened on a side wall of the first body part 143. For example, the sand control passageway 143A may be formed of at least one of a sand control hole, a sand control slot, a sand control mesh, and the like. The cylindrical body further includes a lower connecting portion 142 that at least partially fits within the first body portion 143. The lower coupling part 142 is also generally configured as a cylinder, and its upper end is inserted into the first body part 143 below the sand control passage 143A. The lower connection portion 142 is further configured with a downwardly extending mating catch 145, and a lower end of the catch 145 is configured with a catch projection 145A extending radially outward. Accordingly, a mating locking groove 131 is formed on the inner side of the inner cylinder 130. Second sleeve mechanism 140 may be lowered into position where catch projection 145A of mating catch 145 opposes mating catch slot 131. At this time, the catching protrusion 145A is inserted into the mating catching groove 131 and caught with the mating catching groove 131. This makes it possible to fix the position of the second sleeve mechanism 140 relative to the first sleeve mechanism (inner tube 130). For example, in the embodiment shown in fig. 3, the second sleeve mechanism 140 is limited at its upper end by the upper joint 110, at its lower end by the inner cylinder 130, and the middle sand control passage 143A is directly opposite to the outer passage 121 of the outer cylinder 120. The structure is more stable at this moment, and the mining operation is favorably carried out smoothly.
As shown in fig. 3, the cylindrical body further includes an upper coupling part 141 having a lower end inserted into the first body part 143 and positioned above the sand control passage 143A.
The upper and lower coupling parts 141 and 142 define a sealing ball receiving space therebetween. The second sleeve mechanism 140 may further include a sealing ball 146 disposed in the sealing ball receiving space, and the movable range of the sealing ball 146 is limited by the lower end of the upper connecting portion 141 and the upper end of the lower connecting portion 142. This prevents the sealing ball 146 from being undesirably disengaged from the remaining structure of the second sleeve mechanism 140, which is advantageous in ensuring smooth operation of the sliding sleeve 100. In particular, the upper end of the lower connection part 142 may be formed as a ball seat. Thus, by pressing into the second sleeve means 140, the sealing ball 140 can be tightened against the upper end of the lower connecting part 142 and form a seal there, when the second sleeve means 140 is lowered in the wellbore. This facilitates smooth descent of the second sleeve mechanism 140.
In addition, the second sleeve mechanism 140 may further include a boost assembly 144 embedded on the outside of the tubular body. In the embodiment shown in fig. 3 and 4, a boosting assembly 144 is provided between the upper end of the first body portion 143 and the stepped surface of the upper connecting portion 141 and between the lower end of the first body portion 143 and the stepped surface of the lower connecting portion 142.
The boosting assembly 144 includes, for example, a plurality of elastic units 144A stacked on each other in the axial direction, for example, elastic rings surrounding the upper connection part 141 or the lower connection part 142.
For example, the resilient element 144A may be configured as a rubber bowl structure. The side of the rubber bowl-type elastic member 144A close to the enclosed outer side wall of the connecting portion 141 or the lower connecting portion 142 (i.e., the inner side edge) is offset downward in the axial direction with respect to the outer side edge of the elastic member 144A, and the profile of the elastic member 144A is monotonically deflected in the direction from the inner side edge to the outer side edge.
In a preferred embodiment, as shown in fig. 4, the cross-section of the elastic unit 144A is configured in a form in which the middle portion is offset axially downward with respect to the edge portions (including the inner edge and the outer edge), for example, in a V-shape or a U-shape. The structure of the elastic element 144A with such a structure is more stable, which is beneficial to ensure the stability of the structure of the elastic element 144A and the whole structure of the second sleeve mechanism 140 under the complex and high-pressure environment in the well. From a manufacturing perspective, such a V-shaped or U-shaped spring element 144A is easier to manufacture. This is very beneficial to the efficiency and cost of manufacturing the sleeve 100.
Thus, when the second sleeve mechanism is pushed to move downward from the wellhead side (for example, in the direction indicated by the arrow in fig. 4), the edge portion of the elastic unit 144A is subjected to a force in the direction of the arrow, so that the elastic unit 144A is deformed in a "flattened" manner, that is, the edge portion moves downward relative to the intermediate portion so that the distance by which the edge portion and the intermediate portion are offset relative to each other in the axial direction is shortened. By this deformation, the edge portion of the elastic unit 144A is closer to the inner side wall of the wellbore, the upper joint, or the inner cylinder (the first sleeve mechanism) through which it passes, and thus the gap therebetween can be reduced, and even sealing can be achieved. The reduction (even sealing) of the clearance is advantageous to ensure a smooth run-in of the second sleeve means 140. Further, due to the bendable structure of the elastic unit 144A, the sealing can be achieved without hindering the lowering of the second sleeve mechanism 140, and the smooth lowering of the second sleeve mechanism 140 can be ensured.
In a preferred embodiment, adjacent resilient units 144A are independent of each other and merely overlie each other without direct connection. Without deformation, the lower surface of the elastic unit 144A located above completely overlaps the upper surface of the elastic unit 144A located below. This arrangement is advantageous to improve the boosting capability of the entire boosting assembly 144, and may further be advantageous to ensure smooth downward movement of the second sleeve mechanism 140.
In a preferred embodiment, the resilient member 144A is made of cloth-sandwiched rubber. Such elastic member 144A has a strong abrasion resistance and is not easily damaged.
In addition, when the elastic element 144A is subjected to a large pressure from below, the elastic element 144A may also be deformed in a radially compressive manner, for example, so that the U-shaped or V-shaped cross section becomes longer and narrower. This facilitates increasing the clearance between the resilient element 144A and the inside wall of the wellbore, upper sub or inner barrel (first sleeve means) through which it passes. This facilitates smooth run-in of the second sleeve mechanism 140. In particular, in the case where the plurality of elastic elements 144A are not connected independently of each other, each elastic element 144A is relatively flexible in deformation, enabling rapid deformation to adapt to the pressure conditions within the well. At the same time, for example, when the elastic elements 144A are radially compressed, they are tightly coupled to each other by the radial compression deformation, so as to form a stable, well-coordinated whole which prevents excessive deformation of the individual elastic elements 144A, while ensuring the integrity and stability of the whole mechanism in terms of function and structure.
The boosting mechanism 144 may further be used to assist in righting the second sleeve mechanism 140, further facilitating the lowering of the second sleeve mechanism 140.
The second sleeve mechanism 140 is assembled as follows. A boosting assembly 144 is sleeved on the outer side of the lower connection portion 142. A sealing ball is seated in a ball seat formed at the upper end of the lower connecting portion 142. The first body portion 143 is fitted over the outer side of the lower coupling portion 142 and coupled together by means of a screw coupling. Thus, the above-mentioned booster assembly 144 may be fitted between the lower end of the first body portion 143 and the corresponding stepped surface of the lower connecting portion 142. In addition, another boosting assembly 144 may be sleeved at a step surface outside the upper connection part 141, and then the upper connection part 141 sleeved with the another boosting assembly is inserted at the upper end of the first body part 143 and connected by a screw. Thus, the further booster assembly 144 can be fitted between the upper end of the first body portion 143 and the corresponding stepped surface of the upper connecting portion 142.
With the sliding sleeve 100 of the present invention, it is possible to change the sliding sleeve 100 between the first state, the second state and the third state by a simple and convenient operation. This greatly reduces the complexity of the operation process.
In addition, the structure of the sliding sleeve 100 can realize effective and reliable sand control, thereby effectively performing sand control mining work in a longer time and preventing sand and other well wall collapses from entering a well shaft to block the well shaft. The sliding sleeve 100 has a long service life.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A sand control sliding sleeve comprising:
a first sleeve mechanism configured with an external channel; and
the second sleeve mechanism comprises a cylindrical main body and a sand control channel arranged on the side wall of the cylindrical main body;
when oil and gas are produced, the external channel is opened, and the second sleeve mechanism is put into the first sleeve mechanism, so that the sand control channel is opposite to and communicated with the circulation channel.
2. The sand control sliding sleeve of claim 1, wherein the first sleeve mechanism comprises:
an outer barrel having an outer passage formed on a sidewall thereof to penetrate the sidewall of the outer barrel in a radial direction, an
The inner cylinder is sleeved in the outer cylinder;
in an initial state, the main body of the inner cylinder overlaps with the outer passage to close the outer passage,
the body of the inner barrel is misaligned with the external passage by the inner barrel moving axially downward relative to the outer barrel to open the external passage.
3. The sand control sliding sleeve according to claim 1 or 2, wherein the second sleeve mechanism comprises a sealing ball arranged in the cylindrical main body, and the sealing ball seals off the inner space of the cylindrical main body during the running-in process of the second sleeve mechanism.
4. The sand control sliding sleeve of claim 3 wherein the sealing balls are configured to dissolve after run in of the second sleeve mechanism to enable drainage out of the wellbore by retrograde drainage.
5. The sand control sliding sleeve according to any one of claims 1 to 4, wherein a boosting assembly is embedded on the outer side of the cylindrical body, and the boosting assembly is configured to reduce a gap between the outer side wall of the cylindrical body and the inner side wall of the first sleeve mechanism and/or the inner side wall of the wellbore through which the second sleeve mechanism passes during running of the second sleeve mechanism.
6. The sand control sliding sleeve of claim 5 wherein the boosting assembly comprises an elastomeric unit, at least a portion of which projects radially outward relative to an outer sidewall of the cylindrical body.
7. The sand control sliding sleeve of claim 6, wherein the boosting assembly comprises a plurality of resilient elements stacked on top of each other in the axial direction, the plurality of resilient elements being independent with respect to each other.
8. The sand control sliding sleeve according to claim 6 or 7, wherein the elastic unit is configured as an elastic ring surrounding the cylindrical body, and the section of the elastic ring is configured such that the middle portion is shifted in an axially downward direction with respect to the edge portion.
9. The sand control sliding sleeve according to claims 6 to 8, wherein the elastic element is made of cloth-sandwiched rubber.
10. The sand control sliding sleeve according to any one of claims 1 to 9, wherein a mating bayonet slot is configured on the inner side of the inner barrel, and the second sleeve mechanism is configured with a mating bayonet leg extending downward from the cylindrical body, the mating bayonet leg being able to snap into the mating bayonet slot to fix the position of the second sleeve mechanism relative to the first sleeve mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011227190.2A CN114439419A (en) | 2020-11-06 | 2020-11-06 | Sand prevention sliding sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011227190.2A CN114439419A (en) | 2020-11-06 | 2020-11-06 | Sand prevention sliding sleeve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114439419A true CN114439419A (en) | 2022-05-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011227190.2A Pending CN114439419A (en) | 2020-11-06 | 2020-11-06 | Sand prevention sliding sleeve |
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| CN (1) | CN114439419A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203783547U (en) * | 2013-10-18 | 2014-08-20 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Prefabricated throttle, throwing-in tool of prefabricated throttle and pushing rod of fishing tool of prefabricated throttle |
| CN205714102U (en) * | 2016-05-05 | 2016-11-23 | 中国石油集团渤海钻探工程有限公司 | Elastic claw spacing well cementation pitching sliding sleeve |
| CN106522899A (en) * | 2016-11-03 | 2017-03-22 | 中国石油化工股份有限公司 | Fixed type spring gas lift valve |
| CN107304668A (en) * | 2016-04-22 | 2017-10-31 | 中国石油化工股份有限公司 | A kind of oil recovery gas method |
| US20180320488A1 (en) * | 2017-05-05 | 2018-11-08 | Sc Asset Corporation | System and related methods for fracking and completing a well which flowably installs sand screens for sand control |
-
2020
- 2020-11-06 CN CN202011227190.2A patent/CN114439419A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203783547U (en) * | 2013-10-18 | 2014-08-20 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Prefabricated throttle, throwing-in tool of prefabricated throttle and pushing rod of fishing tool of prefabricated throttle |
| CN107304668A (en) * | 2016-04-22 | 2017-10-31 | 中国石油化工股份有限公司 | A kind of oil recovery gas method |
| CN205714102U (en) * | 2016-05-05 | 2016-11-23 | 中国石油集团渤海钻探工程有限公司 | Elastic claw spacing well cementation pitching sliding sleeve |
| CN106522899A (en) * | 2016-11-03 | 2017-03-22 | 中国石油化工股份有限公司 | Fixed type spring gas lift valve |
| US20180320488A1 (en) * | 2017-05-05 | 2018-11-08 | Sc Asset Corporation | System and related methods for fracking and completing a well which flowably installs sand screens for sand control |
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