CN111810114B - Tracing water-finding and sectional water-controlling system and method - Google Patents
Tracing water-finding and sectional water-controlling system and method Download PDFInfo
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- CN111810114B CN111810114B CN202010500698.9A CN202010500698A CN111810114B CN 111810114 B CN111810114 B CN 111810114B CN 202010500698 A CN202010500698 A CN 202010500698A CN 111810114 B CN111810114 B CN 111810114B
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
Abstract
The application discloses a tracing water-finding and sectional water-controlling system and method. The tracing water finding and sectional water control system comprises a tracing water finding pipe column and a sectional water control pipe column arranged in the tracing water finding pipe column, wherein the tracing water finding pipe column comprises a plurality of expansion packers for dividing a reservoir of a horizontal well into a plurality of water control sections and a tracer sieve tube for obtaining oil-water information of each water control section, adjacent expansion packers are connected through the tracer sieve tube, the sectional water control pipe column comprises a plurality of isolation sealing nipple segments for sealing the plurality of water control sections in sections to form a plurality of sealing sections and a water control valve nipple segment for water control oil extraction of the sealing sections, and the adjacent isolation sealing nipple segments are connected through the water control valve nipple segments. According to the embodiment of the application, the water layer is determined by carrying out segmented tracing and water finding on the reservoir through the tracing and water finding pipe column, and the water control sections are sealed and water-controlled oil extraction in a segmented manner through the segmented water control pipe column which is arranged in the tracing and water finding pipe column, so that the water finding and water control efficiency is improved.
Description
Technical Field
The application relates to the technical field of oilfield development, in particular to a tracing water-finding and segmented water control system and a tracing water-finding and segmented water control method.
Background
In the water shutoff and profile control operation of an offshore high water-containing oil reservoir, two modes of mechanical water shutoff and chemical water shutoff are generally adopted, and before the water shutoff operation, accurate finding of a water outlet layer section is a key for determining success or failure of the water shutoff effect. In the aspect of chemical water shutoff, when chemical agents are put into to plug the water outlet interval, the permeability of a reservoir is seriously reduced, and the productivity of an oil well is sacrificed when water shutoff is carried out. In the aspect of mechanical water shutoff, the principles of water shutoff and water control of a conventional variable-density screen pipe, a central pipe well completion and an inflow control device (Inflow Control Device, ICD for short) screen pipe well completion are established on the basis of mastering the permeability of a reservoir in advance, and the three well completion modes are suitable for balancing the liquid production profile and prolonging the anhydrous oil recovery period in the initial stage of reservoir development, so that the water control effect cannot be achieved on the yielding oil layer.
The automatic inflow control device (Automatic Inflow Control Device, AICD) water control technology has certain self-adaptive water control capability, an intelligent well completion water control oil extraction technology based on ICD or AICD theory is established, the opening of a water control valve can be automatically adjusted according to the reservoir extraction condition, the purpose of stabilizing oil and controlling water is achieved, but on the premise that the position of a water outlet layer is unknown, reasonable well completion parameter design cannot be carried out, the number of water control valves is increased blindly, the water finding and water control efficiency is low, the expected water control effect cannot be achieved, and the well completion cost is increased.
Disclosure of Invention
The embodiment of the application provides a tracing water-finding and sectional water-controlling system and method, which are used for solving the problem of low water-finding and water-controlling efficiency in the related technology.
The embodiment of the application provides a tracing water finding and segmented water control system, which comprises a tracing water finding pipe column and a segmented water control pipe column arranged in the tracing water finding pipe column, wherein the tracing water finding pipe column comprises a plurality of expansion packers for dividing a reservoir of a horizontal well into a plurality of water control sections and a tracer sieve tube for obtaining oil-water information of each water control section, adjacent expansion packers are connected through the tracer sieve tube, the segmented water control pipe column is designed according to the obtained oil-water information of each water control section, the segmented water control pipe column comprises a plurality of isolation sealing nipple pieces for sealing the plurality of water control sections in segments to form a plurality of sealing sections and a water control valve nipple piece for controlling water production of the sealing sections, the adjacent isolation sealing nipple pieces are connected through the water control valve nipple pieces, and the number and the positions of the water control valve nipple pieces are designed according to the obtained oil-water information of each water control section;
the tracer sieve tube comprises a base tube, a cover tube, a filtering structure and a tracer unit, wherein the cover tube and the filtering structure are sleeved on the outer side of the base tube, a first cavity is formed between the filtering structure and the base tube, a second cavity communicated with the first cavity is formed between the cover tube and the base tube, the tracer unit is accommodated in the second cavity, and a through hole communicated with the second cavity and the tube cavity of the base tube is formed in the tube wall of the base tube;
the filter structure comprises two support rings sleeved on the outer side of the base pipe and arranged at intervals and a filter screen lapped on the two support rings, a first cavity is formed among the support rings, the filter screen and the base pipe, a through groove or a through hole which axially penetrates through the support rings is formed in the support rings adjacent to the cover cylinder, and the filter structure further comprises a filter bushing arranged in the first cavity, wherein the filter bushing is sleeved outside the base pipe and covers the inlet of the through groove or the through hole;
the tracer unit includes backing ring and tracer, the backing ring cover is located the base pipe outside, be provided with a plurality of edges in the outer wall circumference of backing ring the backing ring axial direction link up the holding groove of backing ring, the tracer is filled in the holding groove.
The embodiment of the application also provides a tracing water-finding and sectional water-controlling method, which adopts the tracing water-finding and sectional water-controlling system of the embodiment, and comprises the following steps:
dividing a reservoir of the horizontal well into a plurality of water control sections, and acquiring oil-water information of each water control section;
and sealing the plurality of water control sections in a segmented manner to form a sealing section, and performing water control oil extraction on the sealing section.
According to the tracing water finding and segmented water control system and method provided by the embodiment of the application, the reservoir of the horizontal well is divided into a plurality of water control sections through a plurality of expansion packers, the oil-water information of each water control section is obtained through the tracer sieve tube, after the water outlet section is determined by ground tracing evaluation, the segmented water control pipe column design is completed, the plurality of water control sections are segmented and sealed to form a plurality of sealing sections through the isolation sealing nipple, the water control oil extraction is carried out on the sealing sections through the water control valve nipple, the blind increase of the number of water control valves is avoided, the water finding and water control efficiency is improved, the water control effect is improved, and the well completion cost is reduced.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and do not limit the application.
FIG. 1 is a schematic diagram of a track water finding and sectional water control system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a water pipe string according to an embodiment of the present application;
FIG. 3 is a block diagram of a tracer screen according to an embodiment of the application;
FIG. 4 is an enlarged view of the position a of FIG. 3;
FIG. 5 is a block diagram of a tracer unit according to an embodiment of the application;
FIG. 6a is a block diagram of a sliding sleeve of a water control valve nipple in a first position in accordance with an embodiment of the present application;
FIG. 6b is a block diagram of a sliding sleeve of a water control valve nipple in accordance with an embodiment of the present application in a second position;
FIG. 7a is a block diagram of a second water control valve according to an embodiment of the present application;
FIG. 7b is a cross-sectional view of a second water control valve according to an embodiment of the present application;
FIG. 8a is a first block diagram of the valve bottom of a second water control valve according to an embodiment of the present application;
FIG. 8b is a second block diagram of the valve bottom of a second water control valve according to an embodiment of the present application;
fig. 8c is a third construction diagram of a valve bottom of a second water control valve according to an embodiment of the present application.
Description of the reference numerals
10-tracing water finding and sectional water control system; 20-horizontal well; 21-reservoir;
100-tracing a water finding pipe column; 110-hanging a packer; 111-packing leather cup; 120-swelling the packer; 121-an expansion mechanism; 130-tracer screen; 131-base pipe; 132-cover the cylinder; 133-filtration; 1331-a support ring; 1332-a filter screen; 1333-a filter cartridge; 134-tracer unit; 1341-pad damage; 1342-tracer; 135-adapter; 136-a first water control valve; 140-an extension cylinder; 150-floating shoes; 160-centralizer;
200-sectionally finding a water pipe column; 210-positioning a sealing nipple; 211-a clamping part; 212-a first sealing ring; 220-isolating seal nipple; 221-a second sealing ring; 230-a water control valve nipple; 231-first connector; 232-a second linker; 233-a sealed housing; 234-a second water control valve; 2341-valve cap; 2342-valve bottom; 2343-valve orifice; 2344-annular baffles; 2345-overflow aperture; 235-sliding sleeve; 2351-filtration zone; 2352-sealing region; 2353-resilient protrusions; 2353 a-a first resilient protrusion; 2353 b-a second resilient protrusion; 2354—a first limit groove; 2355-a second limit groove; 236-sealing sleeve; 240-piping; 250-guiding shoes.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be arbitrarily combined with each other.
In order to solve the problem of low water finding and water control efficiency in the related art, the embodiment of the application provides a tracing water finding and segmented water control system, which comprises a tracing water finding pipe column and a segmented water control pipe column arranged in the tracing water finding pipe column, wherein the tracing water finding pipe column comprises a plurality of expansion packers for dividing a reservoir of a horizontal well into a plurality of water control sections and a tracer sieve tube for obtaining oil-water information of each water control section, adjacent expansion packers are connected through the tracer sieve tube, the segmented water control pipe column comprises a plurality of isolation sealing nipple pieces for sealing the plurality of water control sections in segments to form a plurality of sealing sections and a water control valve nipple piece for controlling water production of the sealing sections, and the adjacent isolation sealing nipple pieces are connected through the water control valve nipple pieces.
According to the tracing water-finding and sectional water-controlling system provided by the embodiment of the application, the tracing water-finding pipe column is used for tracing water-finding on the reservoir in a sectional manner, the water layer is determined, and the sectional sealing and water-controlling oil extraction are carried out on a plurality of water-controlling sections through the sectional water-controlling pipe column which is arranged in the tracing water-finding pipe column, so that the water-finding and water-controlling efficiency is improved.
The following specifically describes the technical scheme of the tracking water finding and sectional water control system according to the embodiment of the application with reference to the attached drawings.
Fig. 1 is a schematic structural view of a tracing water-finding and sectional water control system according to an embodiment of the present application, and fig. 2 is a schematic structural view of a tracing water-finding pipe column according to an embodiment of the present application. As shown in fig. 1 and 2, the trace water-finding and segmented water control system 10 includes a trace water-finding pipe column 100 and a segmented water control pipe column 200. The tracer water column 100 is used to divide a reservoir of a horizontal well into a plurality of water control sections and to obtain a produced fluid containing a tracer for each water control section at the surface. And (5) evaluating the oil-water information of the produced liquid in the water control section in the ground tracking way, and determining the water outlet section. According to the evaluated water outlet section, the sectional water control pipe column 200 is designed, the sectional water control pipe column 200 is put into the tracing water finding pipe column 100, and the sectional water control pipe column 200 is used for sealing the water control sections in a sectional manner to form a plurality of sealing sections and performing water control oil extraction on the sealing sections. Therefore, after the reservoir water outlet section is evaluated and determined through the tracing water finding pipe column 100, the segmented water control pipe column 200 is put into the tracing water finding pipe column 100 to control water and oil production, so that blind addition of water control valves is avoided, and water finding and water control efficiency is improved. In this embodiment, the segmented water control pipe column 200 may perform water control oil extraction on each seal segment, or may perform water control oil extraction on a part of seal segments, where the water control oil extraction condition is determined according to the result of the ground tracking evaluation, and the water control segment has a water output rate greater than a certain value, for example, 90% or 100%, and does not have a water control oil extraction value, and the seal segment may not perform water control oil extraction.
In an exemplary embodiment, as shown in FIG. 1, a tracer water string 100 includes a hanging packer 110, a plurality of swelling packers 120, and a tracer screen 130. The hanging packer 110 is connected to the swelling packer 120 by an extension tube 140 and is located at one end of the trace water column for setting the borehole wall and supporting the hanging entire trace water column. A plurality of swelling packers 120 are used to separate the reservoir 21 of the horizontal well 20 into a plurality of water control sections, adjacent swelling packers 120 being connected by a tracer screen 130. The tracer screen 130 is used to obtain oil and water information for the corresponding water control segment. In one example, the upper end of the hanging packer 110 is hung and fixed on an upper technical sleeve, the lower end of the hanging packer 110 is connected with the extension cylinder 140, the hanging packer 110 comprises a packing leather cup 111 and a hydraulic driving mechanism, and the packing leather cup 111 expands under the extrusion of the hydraulic driving mechanism inside the hanging packer 110 and is in contact with a well wall to realize a seat seal with the well wall. The end of the extension barrel 140 remote from the suspended packer 110 is connected to the inflatable packer 120. The number of inflatable packers 120 is a plurality, the actual number being determined by the surface segment design. For example, three inflatable packers are arranged in sequence in a direction away from the suspended packer as a first inflatable packer, a second inflatable packer and a third inflatable packer. And a first water control section is formed between the first expansion packer and the second expansion packer, and corresponds to the heel production layer of the horizontal well. And a second water control section is formed between the second expansion packer and the third expansion packer, and corresponds to the middle production layer of the horizontal well. And one side of the third expansion packer, which is away from the second expansion packer, forms a third water control section, and the third water control section corresponds to the toe production layer of the horizontal well. The expansion packer 120 comprises an expansion mechanism 121 which expands when meeting water and/or oil, and the expansion mechanism 121 contacts and seals with the wall of the horizontal well 20 after expanding, so that the section separation of the horizontal well 20 is realized, and a plurality of water control sections are formed. The number of inflatable packers 120 is n, n being an integer greater than 2. The water control section comprises a separation section between the swelling packers and a separation section at the side of the end swelling packer facing away from the hanging packer, whereby the number of water control sections is n. One for each water control segment. The tracer screen 130 corresponds to a high permeability section of the reservoir 21 of the horizontal well 20. The tracer sieve 130 has therein a tracer, which may be a corrosion-inhibiting type tracer, and the tracer may be classified into an oil-soluble tracer and a water-soluble tracer according to solubility, and may be classified into a chemical tracer and a radioactive tracer according to a measurement mode. Taking a radioactive tracer as an example, the water-soluble tracer can be prepared from inorganic salts and chromium-51, indium-114 and rubidium-86 respectively, and the oil-soluble tracer can be prepared from carbon five petroleum resin and iron-59, tin-113 and scandium-45 respectively. The components of the tracers in the different tracer sieve tubes 130 are different, when the wellhead is sampling, the produced fluid is subjected to tracing evaluation, the type and the content of the tracers in the produced fluid are analyzed, the oil-water information of each water control section is obtained, and the water outlet section is determined; the type and the concentration of the oil-soluble tracer and the water-soluble tracer are tested from the produced fluid, the concentration of water and oil in the produced fluid is determined, the water content (oil-water ratio) of the produced fluid is obtained on the basis, and the water outlet section is determined, so that tracing and water finding are realized. In this embodiment, the oil-water information includes concentration information of water and oil for each water control segment.
Fig. 3 is a block diagram of a tracer screen according to an embodiment of the application, and fig. 4 is an enlarged view of position a in fig. 3. In an exemplary embodiment, as shown in fig. 3 to 4, the tracer screen 130 includes a base pipe 131, a cover cylinder 132, a filtering structure 133, and a tracer unit 134, the cover cylinder 132 and the filtering structure 133 are sleeved outside the base pipe 131, a first cavity is formed between the filtering structure 133 and the base pipe 131, a second cavity communicated with the first cavity is formed between the cover cylinder 132 and the base pipe 131, the tracer unit 134 is accommodated in the second cavity, and a through hole for communicating the second cavity with a pipe cavity of the base pipe 131 is provided on a pipe wall of the base pipe 131. The fluid in the reservoir of the horizontal well flows through the filtering structure 133, flows through the first cavity and the second cavity, flows into the lumen of the base pipe through the through hole, and is discharged to the ground through the sleeve connected with the upper end of the hanging packer, so that the produced fluid is formed. When the fluid flows through the second cavity, the tracer in the tracer unit can be gradually dissolved in the fluid, and then the oil-water information of each water control section is obtained through analyzing the type and the content of the tracer in the produced fluid, and the water outlet section is determined. In an example, as shown in fig. 4, the filtering structure 133 includes two supporting rings 1331 sleeved on the outer side of the base pipe 131 and arranged at intervals, and a filtering net 1332 overlapped on the two supporting rings 1331, a first cavity is formed among the supporting rings 1331, the filtering net 1332 and the base pipe 131, a through groove or a through hole penetrating through the supporting rings 1331 along the axial direction is arranged near the supporting ring 1331 of the cover cylinder, one end, close to the filtering net 1332, of the cover cylinder 132 is overlapped on the adjacent supporting ring 1331, and the first cavity and the second cavity are communicated through the through groove. Optionally, the outer wall of the supporting ring 1331 is provided with a first annular step, and the filter screen 1332 is lapped on the first annular step. The outer wall of the supporting ring 1331 is further provided with a second annular step, and the cover cylinder 131 is lapped on the second annular step. In another example, the filter structure 133 further includes a filter liner 1333 disposed within the first cavity, the filter liner 1333 being disposed around the base tube 131 and covering the entrance of the through slot or through hole. The filter insert further increases the filtering performance of the filter structure. It should be noted that the second annular step may be provided only on the support ring adjacent to the cap barrel. In this embodiment, the two ends of the cover cylinder are welded on the base pipe and the supporting ring respectively, the supporting ring can be welded on the base pipe, the supporting ring can also be connected on the base pipe in a threaded manner, and the filter screen can be welded or bonded on the supporting ring.
In an exemplary embodiment, the tracer screen 130 further includes a crossover 135, one end of the crossover 135 being connected to an end of the base pipe 131 adjacent the cap 132, and the other end of the crossover 135 being connected to the swelling packer 120. Fig. 5 is a block diagram of a tracer unit according to an embodiment of the application. In an exemplary embodiment, as shown in fig. 5, the tracer unit 134 includes a backing ring 1341 and a tracer 1342, the backing ring 1341 is sleeved outside the base pipe 131, a plurality of accommodating grooves penetrating the backing ring 1341 along the axial direction of the backing ring 1341 are circumferentially arranged on the outer wall of the backing ring 1341, and the tracer 1342 is filled in the accommodating grooves.
In an exemplary embodiment, as shown in FIG. 4, the through hole is a mounting hole and is located on a side of the grommet 1341 facing away from the filter structure 133, and the tracer screen 130 further includes a first water control valve 136 mounted within the mounting hole. The first water control valve may be an ICD valve, and the number of the first water control valves is plural, for example, 2 to 4, and is set along the circumference of the base pipe 131, and the number of the first water control valves is determined according to the oil-water information of the water control section, and when the water content is larger, the number of the first water control valves may be increased. In the related art, due to the well completion design and inflow state, the fluid tends to flow through the upper part (the side away from the base pipe) of the tracer unit, the tracer at the lower part of the tracer unit may not contact the fluid, resulting in waste. In this embodiment, the first water control valve may be an ICD valve product existing in the art, which is not described herein.
In an exemplary embodiment, as shown in FIG. 2, a segmented water control string 200 includes a positioning seal sub 210, a plurality of isolation seal sub 220, and a water control valve sub 230. The positioning sealing nipple 210 is connected with the isolation sealing nipple 220 through an oil pipe 240 and is positioned at one end of the segmented water control tubular column 200 and used for being set in a hanging packer so as to support and hang the whole segmented water control tubular column 200. After the positioning sealing nipple 210 is clamped in the hanging packer 110, the isolation sealing nipple 220 corresponds to the positions of the expansion packer 120 one by one, and is used for carrying out sectional sealing on a plurality of water control sections in cooperation with the expansion packer 120 to form a plurality of sealing sections. Adjacent isolation sealing nipple 220 is connected through water control valve nipple 230, and water control valve nipple 230 is used for controlling water and oil extraction to the sealing section. In one example, the upper end of the locating seal nipple 210 is connected to a pipe and the lower end is connected to the isolating seal nipple 220 through a pipe 240. The positioning sealing nipple 210 comprises a clamping part 211 clamped at the upper end of the hanging packer 210 and a first sealing ring 212 arranged along the circumferential direction of the positioning sealing nipple 210, wherein the clamping part 211 is clamped at the upper end of the hanging packer 110 to support and hang the whole segmented water control pipe column 200, and the first sealing ring 211 is in interference fit with the inner wall of a sealing cylinder of the hanging packer 110 to realize sealing. The number of isolation seal subs 220 is plural, and the number of isolation seal subs 220 may be the same as or less than the number of swelling packers 120. The isolation sealing nipple 220 comprises a second sealing ring 221 which is arranged along the circumference of the isolation sealing nipple 220, and the second sealing ring 221 is in interference fit with the inner wall of a sealing cylinder of the expansion packer, so that the sectional sealing of different water control sections is realized. The water control valve pup joint 230 can be in one-to-one correspondence with the sealing sections and is determined according to the ground tracing evaluation result. Each water control valve nipple 230 performs water control oil extraction on the corresponding water control section. In the embodiment, the inner walls of the sealing cylinders of the hanging packer and the expansion packer can be polished, so that the stability of sectional water control is improved. The first and second seal rings may comprise rubber rings. It should be noted that, after determining that the water permeability of a certain water control section is higher, for example, 100%, the water control section is sealed to form a sealing section, the water control valve nipple may not be provided, and the isolation sealing nipples at two ends of the water control section may be connected through an oil pipe.
FIG. 6a is a block diagram of a sliding sleeve of a water control valve nipple in a first position in accordance with an embodiment of the present application; fig. 6b is a block diagram of a sliding sleeve of a water control valve nipple in accordance with an embodiment of the application in a second position. In an exemplary implementation, as shown in fig. 6a-6b, the water control valve nipple 230 includes a first joint 231, a second joint 232, and a seal housing 233 disposed between the first joint 231 and the second joint 232, and a plurality of second water control valves 234 disposed on a sidewall of the seal housing 233, the plurality of second water control valves 234 being disposed along a circumferential direction of the seal housing 233. The first connector and the second connector are respectively connected with the corresponding isolation sealing nipple.
The water control valve nipple 230 further includes a sliding sleeve 235 disposed in the first joint 231, the sealing housing 233, and the second joint 232, the sliding sleeve 235 including a filtering area 2351 disposed along an axial direction and a sealing area 2352 disposed at one side of the filtering area, the sliding sleeve 235 being configured to slide between a first position in which the filtering area 2351 covers the outlet of the second water control valve 234 and a second position in which the sealing area 2352 covers the outlet of the second water control valve 234. The filtering section 2351 may include a plurality of mesh openings. In the embodiment, the position of the sliding sleeve is adjusted by the measuring and adjusting equipment which is arranged in the sectional water control pipe column, so that the opening and closing of water control oil extraction of a certain water control section can be controlled, and further selective water control oil extraction of different positions of a horizontal well reservoir is realized.
In an exemplary implementation, as shown in fig. 6a-6b, an elastic protrusion 2353 is disposed on an outer wall of the sliding sleeve 235, a first limiting groove 2354 corresponding to a first position and a second limiting groove 2355 corresponding to a second position are disposed in the first joint 131, the second joint 232 or the sealing housing 233, the elastic protrusion 2353 and the first limiting groove 2354 cooperate to limit the sliding sleeve 235 in the first position, and the elastic protrusion 2353 and the second limiting groove 2355 cooperate to limit the sliding sleeve 235 in the second position. In an example, the sliding sleeve 235 includes a first elastic protrusion 2353a disposed on the sealing region 2352 and a second elastic protrusion 2353b disposed on a side of the filtering region 2351 facing away from the sealing region 2352, the sealing housing 233 is provided with a first limit groove engaged with the first elastic protrusion 2353a, and the second joint 232 is provided with a first limit groove engaged with the second elastic protrusion 2353b and a second limit groove engaged with the second elastic protrusion 2353 b. In another example, a third annular step is disposed within the first joint 231 and a fourth annular step is disposed within the second joint 232. The sliding sleeve 235 abuts against the third annular step in the first position and abuts between the fourth annular step in the second position.
FIG. 7a is a block diagram of a second water control valve according to an embodiment of the present application; FIG. 7b is a cross-sectional view of a second water control valve according to an embodiment of the present application; in an exemplary embodiment, as shown in fig. 7a-7b, the second water control valve 234 includes a valve cover 2341 and a valve bottom 2342, the valve cover 2341 and the valve bottom 2342 enclose a valve cavity, a sidewall of the valve cover 2341 has a valve hole 2343 communicating with the valve cavity, the valve bottom 2342 has an annular baffle 2344 located in the valve cavity toward the valve cover 2341, a side facing away from the valve cover 2341 has a mounting portion 2345, the annular baffle 2344 forms an annular flow channel, and an overflow hole 2346 communicating the valve cavity and a cavity of the base pipe 131 is provided at a center of the mounting portion. FIG. 8a is a first block diagram of the valve bottom of a second water control valve according to an embodiment of the present application; FIG. 8b is a second block diagram of the valve bottom of a second water control valve according to an embodiment of the present application; fig. 8c is a third construction diagram of a valve bottom of a second water control valve according to an embodiment of the present application. Alternatively, as shown in fig. 8a-8c, the annular baffle 2344 has a central symmetrical structure, and a plurality of notches are provided on the annular baffle 2344. The design of the annular flow channel and the notch increases the water resistance with larger inertia force, reduces the oil resistance with smaller inertia force, and the structural design realizes the purposes of increasing the water overflow pressure difference, reducing the oil overflow pressure difference and stabilizing and controlling the oil and the water. In this embodiment, the second water control valve may also be an AICD valve as is known in the art, and is not limited herein.
In this embodiment, the suspended packer and the inflated packer may adopt the prior art means, and the structure thereof will not be described in detail. The positioning sealing nipple is also called positioning sealing, the isolation sealing nipple is also called isolation sealing, and the positioning sealing nipple and the isolation sealing nipple can adopt the prior art means and the structure is not specifically repeated.
The embodiment of the application provides a tracing water finding and sectional water control system, which comprises a tracing water finding pipe column and a sectional water control pipe column arranged in the tracing water finding pipe column, wherein the tracing water finding pipe column comprises a plurality of expansion packers for dividing a reservoir of a horizontal well into a plurality of water control sections and a tracer sieve tube for obtaining oil-water information of each water control section, adjacent expansion packers are connected through the tracer sieve tube, the sectional water control pipe column comprises a plurality of isolation sealing nipple segments for sealing the plurality of water control sections in sections to form a plurality of sealing sections and a water control valve nipple segment for controlling water and oil extraction of the sealing sections, and the adjacent isolation sealing nipple segments are connected through the water control valve nipple segments. According to the embodiment of the application, the reservoir of the horizontal well is divided into a plurality of water control sections through a plurality of expansion packers, the oil-water information of each water control section is obtained through the tracer sieve tube, after the water layer section is determined through ground tracing evaluation, the design of the segmented water control pipe column is completed, the plurality of water control sections are segmented and sealed to form a plurality of sealing sections through the isolation sealing nipple, the water control oil extraction is carried out on the sealing sections through the water control valve nipple, the blind increase of the number of water control valves is avoided, the water finding and water control efficiency is improved, the water control effect is improved, and the well completion cost is reduced.
In another example, the first joint 231 and the second joint 232 are both sleeved on the outer side of the seal housing 233, a fifth annular step is provided in the first joint 231, a sixth annular step is provided in the second joint, the fifth annular step and the sixth annular step are located between the third annular step and the fourth annular step, the water control valve nipple 230 further includes a sealing sleeve 236 provided between the fifth annular step and an end face of the seal housing adjacent to the fifth annular step and between the sixth annular step and an end face of the seal housing adjacent to the sixth annular step, and the sealing sleeve 236 is used for sealing a gap between the sliding sleeve 235 and the first joint 231 and the second joint 232.
In an exemplary embodiment, as shown in fig. 1, the tracing and water-finding pipe column 100 further includes a pair of shoes 150 and a plurality of centralizers 160, the shoes 150 are disposed at the end of the tracing and water-finding pipe column 100 far from the hanging packer 110, the centralizers 160 are disposed outside the base pipe 131 of the tracer sieve tube 130, and the number of the centralizers 160 is the same as the number of the tracer sieve tubes 130. In one example, the float shoe 150 is connected to the swelling packer 120, and in another example, the float shoe 150 is connected to the tracer screen 130. In this embodiment, the centralizer may ensure that the tracer string stays in the center of the well during the well running process, and together with the float shoe, ensure that the tracer string 100 is smoothly run into the well.
In an exemplary embodiment, as shown in fig. 1, the segmented water control string 200 further includes a guide shoe 250, the guide shoe 250 being disposed at an end of the segmented water control string 200 remote from the locating seal nipple 210. In one example, guide shoe 250 is coupled to spacer seal sub 220. In another example, the guide shoe 250 is connected to the water control valve nipple 230. In this embodiment, the guide shoe can prevent the sectional water control pipe column from touching and scraping the inner wall of the tracing water detection pipe column, and guide the sectional water control pipe column to smoothly drop into the tracing water detection pipe column.
The following illustrates the technical scheme of the tracing water-finding and sectional water-controlling system by the working principle of the tracing water-finding and sectional water-controlling system according to the embodiment of the application.
According to the reservoir condition of the horizontal well, a tracing water-finding pipe column is designed, mainly relating to the quantity of expansion packers, the tracing water-finding pipe column is led to the reservoir position by a sleeve pipe connected with the upper end of a hanging packer under the guidance of a floating shoe, and after the tracing water-finding pipe column reaches the reservoir position, a hydraulic driving mechanism of the hanging packer presses a packing leather cup, so that the hanging packer is arranged on a well wall to support and hang the whole tracing water-finding pipe column. The expansion mechanism of the expansion packer expands after encountering fluid in the reservoir and contacts with the well wall, the reservoir is divided into a plurality of water control sections, each water control section corresponds to one tracer screen pipe, each tracer screen pipe comprises an oil-soluble tracer and a water-soluble tracer, and the oil-soluble tracer and the water-soluble tracer in different tracer screen pipes are different. The fluid of different water control sections enters the tube cavity of the base tube through the filtering structure and the tracer units of the corresponding tracer sieve tube, and finally reaches the ground through the sleeve to form the produced liquid. The tracer on the tracer unit is dissolved as the fluid flows through the tracer unit. Because the tracers carried by the fluid in different water control sections are different, by taking a radioactive tracer as an example, the type and the content of the tracer in the produced fluid can be analyzed by carrying out radioactive detection on the produced fluid, so that the oil-water information (the proportion of oil to water) of each water control section can be obtained, and the water outlet section can be determined. Taking a water control section of a certain section as an example, wherein the water control section corresponds to an oil-soluble tracer agent and a water-soluble tracer agent, and if the water-soluble tracer agent corresponding to the water control section is detected in the generated liquid, the oil-soluble tracer agent corresponding to the water control section is not detected, so that the reservoir of the water control section only has water exudation; if the oil-soluble tracer corresponding to the water control section is detected, the water-soluble tracer corresponding to the water control section is not detected, the fact that only oil seeps out from the reservoir of the water control section is indicated, if the oil-soluble tracer corresponding to the water control section is detected, the water-soluble tracer corresponding to the water control section is detected, the fact that an oil-water mixture is produced from the reservoir of the water control section is indicated, and the oil-water ratio in the mixture is calculated through an empirical relation according to the concentration of the oil-soluble tracer and the water-soluble tracer. The empirical relationship is required to pass a ground test to obtain the empirical relationship of the oil-soluble tracer and the concentration and the oil-water ratio of the water-soluble tracer. In order to ensure that the calculated oil-water ratio accords with the on-site reservoir information, produced fluid is sampled in batches at multiple time intervals in on-site operation. And after determining the water outlet section according to the ground tracing evaluation result, designing the segmented water control pipe column, and determining the number of the water control valve pup joints, the number of the second water control valves on the water control valve pup joints and the position of the sliding sleeve of each water control valve pup joint. After the sectional water control pipe column is determined, the sectional water control pipe column is placed into the tracing water finding pipe column through a pipeline, 3-5 tons of force is applied to the sectional water control pipe column through the pipeline, the isolation sealer is embedded into the expansion packer, the second sealing ring of the isolation sealer is in interference fit with the sealing cylinder of the expansion packer, the sectional sealing of different water control sections is realized, the sealing sections are formed, the positioning sealing nipple is embedded into the hanging packer, the clamping part of the positioning sealing nipple is clamped at the upper end of the hanging packer, and the first sealing ring of the positioning sealing nipple is in interference fit with the sealing cylinder of the hanging packer. And the water control valve nipple corresponds to the sealing section for water control oil extraction. After the horizontal well is exploited for a period of time, the permeable fluid of the reservoir may be changed, and the position of the sliding sleeve of the water control valve nipple can be adjusted by the downward-running measuring and adjusting equipment, so that the water control valve nipple can be opened or closed.
According to the working principle of the embodiment of the application, after the oil-water information of different water control sections is obtained through the tracing water-finding pipe column, the sectional water-finding pipe column is designed according to the oil-water information conditions of the different water control sections, so that a blind increase of water control valves is avoided, the different water control sections are sealed in sections to form a sealing section through the sectional water-finding pipe column, the purpose of water control and oil extraction of the sealing section is realized, and the water-finding and water control efficiency is improved. In the water control oil extraction process, the water control valve nipple can be opened or closed by adjusting the position of the sliding sleeve of a certain water control valve nipple, so that the content of oil in the produced liquid is improved.
The application provides a tracing water-finding and sectional water-controlling system, wherein a sectional water-controlling pipe column can not be put into a well in the process of tracing water-finding and trial production in the earlier stage, the traditional oil production is adopted, and the sectional water-controlling pipe column is put into the process according to oil-water information of an oil reservoir after the trial production is finished.
The embodiment of the application also provides a tracing water-finding and sectional water-controlling method, which adopts the tracing water-finding and sectional water-controlling system and comprises the following steps:
dividing a reservoir of the horizontal well into a plurality of water control sections, and acquiring oil-water information of each water control section;
and sealing the plurality of water control sections in a segmented manner to form a sealing section, and performing water control oil extraction on the sealing section.
In an exemplary embodiment, after the oil-water information of each water control section is obtained, the tracing water-finding and sectional water control method further includes:
according to the oil-water information of each water control section, the sectional water control pipe column design is completed, and the sectional water control pipe column is built, wherein the completion of the sectional water control pipe column design comprises the following steps: the number and the positions of the water control valve pup joint are designed, and the number of second water control valves on the water control valve pup joint is designed.
In the description of the present application, it should be noted that, directions or positional relationships indicated by terms "upper", "lower", "one side", "the other side", "one end", "the other end", "the side", "the opposite", "four corners", "the periphery", "the" mouth "character structure", etc., are directions or positional relationships based on the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the structures referred to have a specific direction, are configured and operated in a specific direction, and thus are not to be construed as limiting the present application.
In the description of embodiments of the present application, unless explicitly stated and limited otherwise, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," "assembled" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening media, and may also be in communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Although the embodiments of the present application are described above, the embodiments are only used for facilitating understanding of the present application, and are not intended to limit the present application. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is defined by the appended claims.
Claims (11)
1. A tracking water-finding and sectional water-controlling system, comprising: the system comprises a tracing water-finding pipe column and a segmented water control pipe column arranged in the tracing water-finding pipe column, wherein the tracing water-finding pipe column comprises a plurality of expansion packers for dividing a reservoir of a horizontal well into a plurality of water control sections and a tracer sieve tube for obtaining oil-water information of each water control section, and the adjacent expansion packers are connected through the tracer sieve tube;
the sectional water control pipe column is designed according to the acquired oil-water information of each water control section, and comprises a plurality of isolation sealing nipple segments for sealing the water control sections in a sectional manner to form a plurality of sealing sections and water control valve nipple segments for controlling water and oil extraction of the sealing sections, wherein adjacent isolation sealing nipple segments are connected through the water control valve nipple segments, and the number and the positions of the water control valve nipple segments are designed according to the acquired oil-water information of each water control section;
the tracer sieve tube comprises a base tube, a cover tube, a filtering structure and a tracer unit, wherein the cover tube and the filtering structure are sleeved on the outer side of the base tube, a first cavity is formed between the filtering structure and the base tube, a second cavity communicated with the first cavity is formed between the cover tube and the base tube, the tracer unit is accommodated in the second cavity, and a through hole communicated with the second cavity and the tube cavity of the base tube is formed in the tube wall of the base tube;
the filter structure comprises two support rings sleeved on the outer side of the base pipe and arranged at intervals and a filter screen lapped on the two support rings, a first cavity is formed among the support rings, the filter screen and the base pipe, a through groove or a through hole which axially penetrates through the support rings is formed in the support rings adjacent to the cover cylinder, and the filter structure further comprises a filter bushing arranged in the first cavity, wherein the filter bushing is sleeved outside the base pipe and covers the inlet of the through groove or the through hole;
the tracer unit includes backing ring and tracer, the backing ring cover is located the base pipe outside, be provided with a plurality of edges in the outer wall circumference of backing ring the backing ring axial direction link up the holding groove of backing ring, the tracer is filled in the holding groove.
2. The trace water-finding and sectional water-controlling system according to claim 1, wherein: the number of the expansion packer and the isolation sealing nipple are the same and the positions of the expansion packer and the isolation sealing nipple are in one-to-one correspondence.
3. The trace water-finding and sectional water-controlling system according to claim 1, wherein: the through hole is located one side of the backing ring, which is away from the filtering structure, the through hole is a mounting hole, the tracer sieve tube further comprises a first water control valve which is mounted on the mounting hole, and the first water control valve is an ICD valve.
4. The trace water-finding and sectional water-controlling system according to claim 1, wherein: the filter structure comprises two support rings sleeved on the outer side of the base pipe and arranged at intervals and a filter screen lapped on the two support rings, a first cavity is formed among the support rings, the filter screen and the base pipe, a through groove or a through hole which axially penetrates through the support rings is formed adjacent to the support rings of the cover cylinder, one end, close to the filter screen, of the cover cylinder is lapped on the adjacent support rings, and the first cavity and the second cavity are communicated through the through groove or the through hole.
5. The trace water-finding and sectional water-controlling system according to claim 1, wherein: the water control valve nipple joint comprises a first connector, a second connector, a sealing shell arranged between the first connector and the second connector, a plurality of second water control valves arranged on the side wall of the sealing shell, a plurality of second water control valves arranged along the circumferential direction of the sealing shell, and an AICD valve.
6. The tracking water-finding and sectional water-controlling system according to claim 5, wherein: the water control valve nipple joint is characterized by further comprising a sliding sleeve arranged in the first joint, the sealing shell and the second joint, wherein the sliding sleeve comprises a filtering area and a sealing area, the filtering area is axially arranged, the sealing area is positioned on one side of the filtering area, the sliding sleeve is arranged to slide between a first position and a second position, when in the first position, the filtering area covers the second water control valve outlet, and when in the second position, the sealing area covers the second water control valve outlet.
7. The tracking water-finding and sectional water-controlling system according to claim 5, wherein: the second water control valve comprises a valve bottom and a valve cover, the valve bottom and the valve cover enclose a valve cavity, the side wall of the valve cover is provided with a valve hole communicated with the valve cavity, the valve bottom faces towards one side of the valve cover and is provided with an annular baffle plate positioned in the valve cavity, one side of the valve bottom, which is away from the valve cover, is provided with a mounting part, the annular baffle plate forms an annular flow channel, and the center of the mounting part is provided with an overflow hole communicated with the valve cavity and the pipe cavity of the base pipe.
8. The tracking water finding and staging water control system according to any one of claims 1-7, characterized in that: the tracing water-finding pipe column further comprises a hanging packer, wherein the hanging packer is connected with the expansion packer through an extension tube and is located at one end of the tracing water-finding pipe column and used for sealing a well wall to support and hang the whole tracing water-finding pipe column.
9. The tracking water-finding and sectional water-controlling system according to claim 8, wherein: the sectional water control pipe column further comprises a positioning sealing nipple, the positioning sealing nipple is connected with the isolation sealing nipple through an oil pipe and is located at one end of the sectional water control pipe column and used for being set in the hanging packer to support and hang the whole sectional water control pipe column.
10. A method for tracing and water-finding and sectional control, which adopts the tracing and water-finding and sectional control system as set forth in any one of claims 1-9, and is characterized by comprising:
dividing a reservoir of a horizontal well into a plurality of water control sections, and acquiring oil-water information of each water control section;
and sealing a plurality of water control sections in a segmented manner to form a sealing section, and performing water control oil extraction on the sealing section.
11. The trace water-finding and sectional water-controlling method as claimed in claim 10, wherein: after the oil-water information of each water control section is obtained, the tracing water-finding and segmented water control method further comprises the following steps:
according to the oil-water information of each water control section, completing the design of a sectional water control pipe column and building the sectional water control pipe column, wherein the completion of the design of the sectional water control pipe column comprises the following steps: the number and the positions of the water control valve pup joint are designed, and the number of second water control valves on the water control valve pup joint is designed.
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| CN202010500698.9A CN111810114B (en) | 2020-06-04 | 2020-06-04 | Tracing water-finding and sectional water-controlling system and method |
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| CN202010500698.9A CN111810114B (en) | 2020-06-04 | 2020-06-04 | Tracing water-finding and sectional water-controlling system and method |
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| CN114458284A (en) * | 2020-10-30 | 2022-05-10 | 中国石油天然气股份有限公司 | Release device, screen pipe column and production section testing method |
| CN112302579B (en) * | 2020-11-04 | 2021-08-10 | 中国石油大学(北京) | Horizontal well subsection sand prevention water plugging system and method |
| CN112267880B (en) * | 2020-11-04 | 2021-12-17 | 中国石油大学(北京) | Horizontal well subsection sand prevention and water control pipe string and design method thereof |
| CN112878983A (en) * | 2021-01-06 | 2021-06-01 | 北京合力奇点科技有限公司 | Intelligent production dynamic monitoring flow-regulating water-controlling well completion method for oil and gas well |
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