CN111852412A - Well-developing gravel packing completion method and well-developing completion pipe string - Google Patents
Well-developing gravel packing completion method and well-developing completion pipe string Download PDFInfo
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- CN111852412A CN111852412A CN202010708701.6A CN202010708701A CN111852412A CN 111852412 A CN111852412 A CN 111852412A CN 202010708701 A CN202010708701 A CN 202010708701A CN 111852412 A CN111852412 A CN 111852412A
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/04—Gravelling of wells
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
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Abstract
The disclosure provides a development well gravel packing well completion method and a development well completion pipe string, and belongs to the technical field of development well completion. The stratum is divided into a plurality of sub-layers, the sub-layers are in a heavy filling stratum or a light filling stratum, and sand is not easy to generate in the light filling stratum relative to the heavy filling stratum. And sequentially introducing mortar containing gravels into each space in the direction from the bottom to the top of the well hole of the development well. And for the refilled formation, the gravel fills the space corresponding to the refilled formation and permeates the gravel into the refilled formation. For the lightly filled stratum, the gravel is filled in the space corresponding to the lightly filled stratum, so that the sand production condition of the lightly filled stratum can be avoided. Compared with the traditional gravel filling method for enabling gravel to permeate into the stratum, the method can ensure the sand prevention effect and effectively reduce the cost for gravel filling the development well.
Description
Technical Field
The disclosure relates to the technical field of well completion of development wells, in particular to a gravel packing well completion method of a development well and a well completion pipe string of the development well.
Background
A development well is a well that is relatively common for the production of oil or gas. In the process of drilling and completing the well, a sand prevention measure is generally adopted for the development well, so that the sand production condition of the development well in the later development is prevented, and the sand in an oil-gas reservoir is prevented from entering the development well.
The development well is usually sand-proof by gravel packing, and the gravel packing needs a development well completion string. The well completion pipe column of the development well at least comprises an outer pipe column, an inner pipe column and annular packers, wherein the outer pipe column comprises a plurality of sieve pipes which are alternately and coaxially connected, communication holes are formed in the sieve pipes, the annular packers are coaxially fixed between every two adjacent sieve pipes, the inner pipe column is coaxially positioned in the outer pipe column, and filling holes corresponding to each sieve pipe are formed in the inner pipe column.
In the related art, when gravel packing is performed on a development well, an outer tubular column is usually placed in a reservoir, an inner tubular column of the development well is then placed in the outer tubular column, mortar containing gravel is continuously introduced into the inner tubular column from the ground, the mortar containing gravel enters a sieve tube from a packing hole, and enters an annular space formed by a stratum, the sieve tube and annular packers at two ends of the sieve tube from a communicating hole of the sieve tube. And when the solid gravel is extruded to fill the stratum, part of liquid in the mortar enters an annular space between the inner pipe column and the outer pipe column from the sieve pipe and flows back to the ground until an oil layer outside each sieve pipe is infiltrated and extruded by the gravel, and gravel filling is finished. The filling method needs to fill gravel into the inner pipe column all the time, needs the gravel to deeply penetrate into an oil layer, consumes more mortar, and has higher cost for filling gravel into a development well.
Disclosure of Invention
The embodiment of the disclosure provides a development well gravel packing completion method and a development well completion string, which can reduce the cost required for gravel packing a development well. The well-developing gravel pack completion method comprises the following steps:
embodiments of the present disclosure provide a development well gravel pack completion method, comprising:
dividing a stratum into a plurality of sublayers according to the distribution condition of the fine sand content of the stratum through which a well bore passes in an oil and gas reservoir area, wherein each sublayer is one of a heavily filled stratum and a lightly filled stratum, and the fine sand content of the lightly filled stratum is less than that of the heavily filled stratum;
lowering a development well completion string in the development well borehole so that a plurality of separation spaces arranged along the extension direction of the development well borehole are formed between the stratums of the development well completion string, wherein each space corresponds to one sub-layer;
sequentially introducing mortar containing gravels into each space in the direction from the bottom to the top of the well hole of the development well;
wherein, for the heavy filling stratum, the gravel fills the space corresponding to the heavy filling stratum, and the gravel is infiltrated into the heavy filling stratum; and for the light filling stratum, filling the space corresponding to the light filling stratum with the gravel.
Optionally, the dividing the formation into a plurality of sub-layers according to the distribution of fine sand content of the formation through which the well bore in the development well in the oil and gas reservoir region passes includes:
acquiring the fine sand content distribution condition of a stratum through which a well bore of a development well in an oil and gas reservoir area passes;
and dividing a stratum area with the fine sand content smaller than a filling threshold value and a stratum area with the fine sand content larger than the filling threshold value into different sub-layers, wherein the sub-layer with the fine sand content smaller than the filling threshold value is a light filling stratum, and the sub-layer with the fine sand content larger than the filling threshold value is divided into a heavy filling stratum.
Optionally, the acquiring the distribution of the fine sand content of the formation through which the well bore of the development well in the oil and gas reservoir region passes includes:
selecting a plurality of sampling points at equal intervals along the axis of the well bore of the development well in the stratum passed by the well bore of the development well, wherein the two sampling points are respectively positioned at two ends of the well bore of the development well;
obtaining a formation sample at each of the sampling points;
and obtaining the distribution condition of the fine sand content of the stratum through which the well bore of the development well passes according to the fine sand content of the stratum sample.
Optionally, the dividing a formation area with a fine sand content smaller than a filling threshold value and a formation area with a fine sand content larger than the filling threshold value into different sub-layers includes:
Dividing the formation area corresponding to a plurality of sampling points which are continuously arranged and have the corresponding fine sand content larger than the filling threshold value into a sublayer; and dividing the formation area corresponding to a plurality of continuously arranged sampling points, the fine sand content of which is less than the filling threshold value, into a sublayer.
Optionally, the filling threshold value ranges from 5% to 10%.
Optionally, the distance between adjacent sampling points is 5m to 10 m.
Optionally, the sequentially introducing gravel-containing mortar into each space in a direction from the bottom to the top of the development well borehole includes:
for any space, acquiring the length of the sub-layer corresponding to the space along the axis of the well bore of the development well;
determining the volume of the filling mortar required by the sublayer according to the length of the sublayer;
and introducing mortar containing gravels into the space until the volume of the consumed mortar is equal to that of the filling mortar.
Optionally, the determining the volume of the filling mortar required by the sub-layer according to the length of the sub-layer includes:
when the sub-layer is the heavily filled formation,
the ratio of the length of the sublayer to the volume of the backfilled mortar is 1: 0.1-1: 0.3;
When the sub-layer is a lightly filled formation,
the ratio of the length of the sub-layer to the volume of the heavy filling mortar is 10: 0.22-10: 0.25.
Optionally, the method for gravel packing a development well comprises:
the outer pipe column of the development well completion pipe column comprises light filling sieve pipes and heavy filling sieve pipes which are alternately connected, the length of each light filling sieve pipe is equal to the length of the corresponding light filling stratum along the axis of the development well borehole, and the length of each heavy filling sieve pipe is equal to the length of the corresponding heavy filling stratum along the axis of the development well borehole.
The disclosed embodiments provide a development well completion string suitable for use in a development well gravel pack completion method as described above, the development well completion string comprising an outer string, an annular packer, and an inner string,
the outer pipe column comprises a plurality of light filling sieve pipes and heavy filling sieve pipes which are coaxially and alternately connected, the length of each light filling sieve pipe is equal to the length of the corresponding light filling stratum along the axis of the development well, the length of each heavy filling sieve pipe is equal to the length of the corresponding heavy filling stratum along the axis of the development well, the light filling sieve pipes and the heavy filling sieve pipes are respectively provided with light communication holes and heavy connecting through holes, and one annular packer is coaxially connected between the adjacent light filling sieve pipes and the adjacent heavy filling sieve pipes;
The inner pipe column comprises an oil pipe and a switch assembly, the oil pipe is coaxially located in the outer pipe column, light filling holes corresponding to the light communication holes and heavy filling holes corresponding to the heavy connection through holes are formed in the oil pipe, the switch assembly is arranged on the oil pipe, and the switch assembly on each cylindrical section is used for opening or closing the light filling holes or the heavy filling holes in the cylindrical section.
The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:
the fine sand content of the formation in the oil and gas reservoir zone is directly related to the sand production after completion of the development well. The higher the fine sand content, the easier it is to produce sand after the well has been developed. Therefore, the stratum can be divided into a plurality of sublayers according to the distribution condition of the fine sand content of the stratum through which the well bore of the development well in the oil and gas reservoir area passes, the sublayer is one of a heavily filled stratum and a lightly filled stratum, the fine sand content of the lightly filled stratum is smaller than that of the heavily filled stratum, and the lightly filled stratum is not easy to produce sand relative to the heavily filled stratum. And correspondingly lowering the development well completion pipe column, so that partition spaces which are respectively in one-to-one correspondence with the sub-layers are formed between the development well completion pipe column and the inner wall of the well hole of the development well, and subsequent gravel filling is carried out. And sequentially introducing mortar containing gravels into each space in the direction from the bottom to the top of the well hole of the development well. And for the refilled stratum, the gravel fills the space corresponding to the refilled stratum, and the gravel is enabled to permeate into the refilled stratum, so that the effect of isolating the stratum from the well completion pipe column of the development well is better, and the possibility of sand production of the refilled stratum is reduced. For the light filling stratum, the gravel is filled in the space corresponding to the light filling stratum without permeating into the light filling stratum, so that the effective sand prevention effect can be achieved, and the sand production condition of the light filling stratum is avoided. The gravel packing with different degrees is carried out on the space between the heavy-packed stratum and the well completion pipe column of the development well and the space between the light-packed stratum and the well completion pipe column of the development well, compared with the traditional gravel packing method for enabling gravel to permeate into the stratum, the gravel packing method can ensure the sand prevention effect and effectively reduce the cost required for gravel packing the development well.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings used in the description of the embodiments will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive efforts,
FIG. 1 is a schematic structural diagram of a development well completion string provided by an embodiment of the present disclosure;
FIG. 2 is a schematic illustration of another use of a development well completion string provided by embodiments of the present disclosure;
FIG. 3 is a schematic illustration of yet another use of a development well completion string provided by an embodiment of the present disclosure;
FIG. 4 is a schematic structural view of an outer tubing string provided by embodiments of the present disclosure;
FIG. 5 is a schematic view of another fill state provided by embodiments of the present disclosure;
FIG. 6 is a development well gravel pack completion method provided by embodiments of the present disclosure;
FIG. 7 is another method of developing a well gravel pack completion provided by embodiments of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a development well completion string provided by an embodiment of the present disclosure, and as can be seen from fig. 1, the development well completion string includes an outer string 1, an annular packer 2, and an inner string 3, the outer string 1 includes a plurality of light-packed screens 11 and heavy-packed screens 12 alternately connected, the length of the light-packed screens 11 is equal to the length of the corresponding light-packed formation along the axis of the development well borehole, and the length of the heavy-packed screens 12 is equal to the length of the corresponding heavy-packed formation along the axis of the development well borehole. The light filling sieve tube 11 and the heavy filling sieve tube 12 are respectively provided with a light communication hole 111 and a heavy communication hole 121, an annular packer 2 is coaxially connected between the adjacent light filling sieve tube 11 and the heavy filling sieve tube 12, the inner tubular column 3 comprises an oil pipe 31 and a switch assembly 32, the oil pipe 31 is coaxially positioned in the outer tubular column 1, the oil pipe 31 is provided with a light filling hole 311 corresponding to each light filling sieve tube 11 and a heavy filling hole 312 corresponding to each heavy filling sieve tube 12, the switch assembly 32 is arranged on the oil pipe 31, and the switch assembly 32 on each cylinder section 313 is used for opening or closing the light filling hole 311 or the heavy filling hole 312 on the cylinder section 313.
When it is desired to gravel pack a development wellbore, the outer string 1 of the development well completion string may be lowered into the development wellbore first. The outer string 1 includes a plurality of coaxially connected light-filled screens 11 and heavy-filled screens 12, with an annular packer 2 coaxially connected between adjacent light-filled screens 11 and heavy-filled screens 12. And a light filling screen 11 or a heavy filling screen 12 is arranged between two adjacent annular packers 2. And spaces S corresponding to light filling stratums or heavy filling stratums are formed between the two adjacent annular packers 2 and the outer walls of the exploitation well borehole and the two outer pipe columns 1. Coaxially lowering an inner string 3 into an outer string 1, the inner string 3 comprising an oil pipe 31 and a switch assembly 32. Tubing 31 includes a plurality of sections 313, each section 313 having a light fill hole 311 or a heavy fill hole 312 in a sidewall thereof, the plurality of sections 313 being coaxially connected in series, and the plurality of sections 313 decreasing in diameter in series from the top of the development well bore to the bottom of the development well bore. Each barrel section 313 is provided with a switch assembly 32 on the inner wall, and when the development well completion string of the present disclosure is used for filling the space S closest to the bottom of the development well borehole, slurry containing gravel flows out from the side wall of the light communication hole 111 or the reconnecting through hole 121 (outer string 1) and then flows to the bottom of the development well borehole for gravel packing, the flow direction of the gravel is the same as the flow direction of the gravel, the resistance applied during gravel packing is small, and the gravel packing effect on the bottom of the development well borehole is good.
Optionally, the oil pipe 31 includes a plurality of barrel sections 313, a light filling hole 311 or a heavy filling hole 312 is formed in a side wall of each barrel section 313, the plurality of barrel sections 313 are coaxially connected in sequence, diameters of the plurality of barrel sections 313 decrease in sequence in an axial direction of the oil pipe 31, a switch assembly 32 is disposed on an inner wall of each barrel section 313, each switch assembly 32 includes a sliding sleeve 321 and a sealing ball 322, the sliding sleeve 321 is slidably and coaxially disposed in one barrel section 313, an outer wall of the sliding sleeve 321 covers one light filling hole 311 or one heavy filling hole 312, an annular limiting groove a is formed in the inner wall of the barrel section 313, a minimum distance between the annular limiting groove a and the light filling hole 311 or the heavy filling hole 312 in the axial direction of the sliding sleeve 321 is greater than a length of the sliding sleeve 321, and the sealing ball 322 is located at an end of the sliding sleeve 321 away from the annular limiting groove a.
Each switch assembly 32 comprises a sliding sleeve 321 and a sealing ball 322, the sliding sleeve 321 is slidably and coaxially arranged in a cylinder section 313, and the outer wall of the sliding sleeve 321 covers a light filling hole 311 or a heavy filling hole 312. The inner wall of the shell ring 313 is provided with an annular limiting groove A. When slurry containing gravel needs to be filled, a sealing ball 322 of the development assembly 32 is put into use, and the sealing ball 322 pushes the sliding sleeve 321 to move towards the annular limiting groove A until the sliding sleeve 321 is clamped by the annular limiting groove A. In the axial direction of the sliding sleeve 321, the minimum distance between the annular limiting groove a and the light filling hole 311 or the heavy filling hole 312 is greater than the length of the sliding sleeve 321, so that the sliding sleeve 321 can move to a position where the light filling hole 311 or the heavy filling hole 312 is completely exposed, slurry containing gravel can be introduced from the oil pipe 31, enter the light filling hole 311 or the heavy filling hole 312, then correspondingly enter the light communication hole 111 or the heavy communication hole 121, and finally gravel is filled in the space. The filling of the plurality of spaces S may be accomplished by sequentially plunging the sealing balls 322 in the switch assemblies 32 of different sizes, starting from the bottom of the development well bore. Different filling modes of the light filling stratum 100 and the heavy filling stratum 200 are easy to realize, the cost for filling gravel is effectively controlled, and the cost for filling gravel in a development well is reduced to a certain extent.
Alternatively, adjacent segments 313 may be secured to one another using a threaded B connection. The connection between the different cylindrical sections 313 is easily achieved.
Referring to fig. 1, each of the cylinder segments 313 may include a first tube 313a, a mounting tube 313b, and a second tube 313c coaxially disposed in sequence. The light filling hole 311 or the heavy filling hole 312 is located on the mounting cylinder 313b, and the sliding sleeve 321 and the annular limiting groove a are also located on the inner wall of the mounting cylinder 313 b.
The arrangement of the sliding sleeve 321 and the annular limiting groove a can be realized without affecting the strength of the first tube 313a and the second tube 313 c.
Optionally, the mounting cylinder 313b may further be provided with a flow passage C arranged along the axis of the mounting cylinder 313 b. It is ensured that liquid flows out of the development well completion string from between the inner 3 and outer 1 string.
Referring to fig. 1, each of the light packing screens 11 includes a first screen 112, a light packing canister 113, and a second screen 114 coaxially connected in sequence, and light communication holes 111 are provided on a sidewall of the light packing canister 113. Each refill screen 12 includes a first screen 122, a refill cartridge 123, and a second screen 124 coaxially connected in sequence, with a refill throughbore 121 disposed in the sidewall of the refill cartridge 123.
Optionally, the outer tubing string 1 may further comprise packing assemblies 13, each packing assembly 13 being disposed on an inner wall of one of the light packing cartridges 113 or one of the heavy packing cartridges 123, respectively.
Each fill assembly 13 includes a reset sleeve 131 and a reset spring 132. The reset sleeve 131 is coaxially and slidably disposed on the inner wall of the light filling cylinder 113 or the heavy filling cylinder 123, the outer wall of the reset sleeve 131 covers the light communication hole 111 or the heavy connection through hole 121, the inner wall of the reset sleeve 131 has a coaxial inner tubular column pushing groove 131a, the minimum distance between one end of the reset sleeve 131 and the corresponding light communication hole 111 or the corresponding heavy connection through hole 121 is greater than the length of the reset sleeve 131, the reset spring 132 is disposed along the length direction of the reset sleeve 131, and two ends of the reset spring 132 are respectively connected with the reset sleeve 131 and the reset sleeve 131.
After the inner string 3 enters the outer string 1, the mounting tube 313b of the inner string 3 can push the reset sleeve 131 to slide out of the corresponding light communication hole 111 or the corresponding reconnecting through hole 121 through the inner string pushing groove 131a to perform gravel packing, and the reset spring 132 is compressed. After the inner string 3 is lifted out of engagement from the outer string 1, the return spring 132 may urge the return sleeve 131 back to cover the corresponding light communication hole 111 or the corresponding reconnect through hole 121.
Optionally, the filling assembly 13 may further include a sealing ring 133, and the sealing ring 133 is coaxially disposed on the inner wall of the filling sleeve 131 and located between the filling sleeve 131 and the resetting sleeve 131. Avoiding the re-entry of the returning liquid into the space S.
To facilitate understanding, fig. 2 is provided herein, and fig. 2 is a schematic view of another use of the development well completion string provided by an embodiment of the present disclosure, and referring to fig. 2, it can be seen that, with respect to the state of the development well completion string in fig. 1, the refill hole 312 of the switch assembly 31 closest to the bottom of the development well bore is opened and the grout has been filled. While the larger diameter switch assembly 31 is not affected and the refill hole 312 is not exposed.
Fig. 3 is a schematic diagram of another use of the development well completion string provided by an embodiment of the present disclosure, and referring to fig. 3, it can be seen that fig. 3 completes further packing with respect to fig. 2, the refill holes 312 of both switch assemblies 31 in fig. 3 are opened, and the formation 100 has been packed by gravel infiltration.
It is noted that the formation 100 in fig. 3 is a heavily-packed formation 200.
Fig. 4 is a schematic structural diagram of the outer tubular string according to the embodiment of the present disclosure, and referring to fig. 4, it can be seen that after gravel packing is completed, the inner tubular string 3 is separated from the outer tubular string 1, and the reset spring 132 in the outer tubular string 1 pushes the reset sleeve 131 to cover the reconnecting through hole 121.
Fig. 5 is a schematic view of another filling state provided by an embodiment of the disclosure, and referring to fig. 5, it can be seen that when the space S corresponding to the lightly-filled formation 100 is filled, no gravel permeates into the lightly-filled formation 100.
Fig. 6 is a development well gravel packing completion method provided by an embodiment of the present disclosure, wherein the gravel packing in fig. 6 can be implemented by using a development well completion string as described above, and as can be seen from fig. 6, the development well gravel packing completion method includes:
s101: according to the distribution condition of the fine sand content of the stratum through which a well bore of a development well in an oil and gas reservoir area passes, the stratum is divided into a plurality of sub-layers, each sub-layer is one of a heavily filled stratum and a lightly filled stratum, and the fine sand content of the lightly filled stratum is smaller than that of the heavily filled stratum.
S102: and lowering the development well completion pipe string in the development well borehole, so that a plurality of separation spaces arranged along the extension direction of the development well borehole are formed between the formations of the development well completion pipe string, and each space corresponds to one sub-layer.
S103: and sequentially introducing mortar containing gravels into each space in the direction from the bottom to the top of the well hole of the development well.
S104: for the refilled stratum, filling the space corresponding to the refilled stratum with gravels, and infiltrating the gravels into the refilled stratum; for a lightly packed formation, the gravel fills the space corresponding to the lightly packed formation.
The fine sand content of the formation in the oil and gas reservoir zone is directly related to the sand production after completion of the development well. The higher the fine sand content, the easier it is to produce sand after the well has been developed. Therefore, the stratum can be divided into a plurality of sublayers according to the distribution condition of the fine sand content of the stratum through which the well bore of the development well in the oil and gas reservoir area passes, the sublayer is one of a heavily filled stratum and a lightly filled stratum, the fine sand content of the lightly filled stratum is smaller than that of the heavily filled stratum, and the lightly filled stratum is not easy to produce sand relative to the heavily filled stratum. And correspondingly lowering the development well completion pipe column, so that partition spaces which are respectively in one-to-one correspondence with the sub-layers are formed between the development well completion pipe column and the inner wall of the well hole of the development well, and subsequent gravel filling is carried out. And sequentially introducing mortar containing gravels into each space in the direction from the bottom to the top of the well hole of the development well. And for the refilled stratum, the gravel fills the space corresponding to the refilled stratum, and the gravel is enabled to permeate into the refilled stratum, so that the effect of isolating the stratum from the well completion pipe column of the development well is better, and the possibility of sand production of the refilled stratum is reduced. For the light filling stratum, the gravel is filled in the space corresponding to the light filling stratum without permeating into the light filling stratum, so that the effective sand prevention effect can be achieved, and the sand production condition of the light filling stratum is avoided. The gravel packing with different degrees is carried out on the space between the heavy-packed stratum and the well completion pipe column of the development well and the space between the light-packed stratum and the well completion pipe column of the development well, compared with the traditional gravel packing method for enabling gravel to permeate into the stratum, the gravel packing method can ensure the sand prevention effect and effectively reduce the cost required for gravel packing the development well.
The fineness modulus of the fine sand is in the range of 2.2 to 1.6, and the average particle diameter of the fine sand is 0.35 to 0.25 mm. The fineness modulus is an index for representing the fineness degree and the category of the particle size of the natural sand.
Fig. 7 is another development well gravel pack completion method provided by embodiments of the present disclosure, and with reference to fig. 6, the development well gravel pack completion method may include:
s201: according to the distribution condition of the fine sand content of the stratum through which a well bore of a development well in an oil and gas reservoir area passes, the stratum is divided into a plurality of sub-layers, each sub-layer is one of a heavily filled stratum and a lightly filled stratum, and the fine sand content of the lightly filled stratum is smaller than that of the heavily filled stratum.
It should be noted that lightly packed formations and heavily packed formations actually refer to formation zones in this disclosure where the fine sand content falls within different ranges.
Optionally, in step S201, dividing the formation into a plurality of sub-layers according to the distribution of fine sand content of the formation through which the well bore in the oil and gas reservoir region is developed may include:
and acquiring the fine sand content distribution condition of the stratum through which the well bore of the development well in the oil and gas reservoir area passes. And dividing a stratum area with the fine sand content smaller than the filling threshold value and a stratum area with the fine sand content larger than the filling threshold value into different sub-layers, wherein the sub-layer with the fine sand content smaller than the filling threshold value is a light filling stratum, and the sub-layer with the fine sand content larger than the filling threshold value is a heavy filling stratum.
According to the distribution condition of the fine sand content of the stratum through which the well bore of the development well in the oil and gas reservoir area passes, the stratum area with the fine sand content smaller than the filling threshold value and the stratum area with the fine sand content larger than the filling threshold value can be divided into different sub-layers, and gravel filling can be conveniently carried out on the different sub-layers subsequently.
Optionally, obtaining the distribution of fine sand content of the formation through which the well bore of the development well in the oil and gas reservoir region passes includes:
selecting a plurality of sampling points at equal intervals along the axis of the well bore of the development well in the stratum through which the well bore passes, wherein the two sampling points are respectively positioned at two ends of the well bore of the development well; obtaining a formation sample at each sampling point; and obtaining the distribution condition of the fine sand content of the stratum through which the well bore of the development well passes according to the fine sand content of the stratum sample.
The multiple stratum samples can visually reflect the fine sand content of multiple positions in the stratum through which the well bore is developed, and the determination of the fine sand content is facilitated. The multiple formation samples are taken at multiple sampling points along the axis of the well bore of the development well, and the change of the fine sand content of the formation along the axis of the well bore of the development well can be reflected.
It should be noted that the fine sand content is typically distributed in blocks within the formation through which the well bore is developed, for example, a zone of the formation may have an overall lower fine sand content while an adjacent zone of the formation may have an overall higher fine sand content. Therefore, the fine sand content obtained by a plurality of sampling points can reflect the distribution of the fine sand content.
Optionally, when the sampling point in step S201 is determined, a geological picture of the hydrocarbon reservoir region may be obtained first; and determining a plurality of sampling points at equal intervals along the axis of the borehole of the development well in the stratum passed by the borehole of the development well according to the geological picture.
And selecting a plurality of sampling points at equal intervals along the axis of the borehole of the development well in the stratum where the borehole of the development well passes according to the geological picture, so that the sampling points can be determined and selected conveniently, and the geological picture can be obtained according to geological exploration equipment.
Illustratively, the distance between adjacent sampling points may be 5m to 10 m. The distribution of the content of the fine sand is objective.
It should be noted that the fine sand content may be a percentage of the volume of fine sand in a cubic volume of the formation.
In step S201, the formation area in which the fine sand content is less than the filling threshold and the formation area in which the fine sand content is greater than the filling threshold are divided into different sublayers, which may include:
dividing the formation area corresponding to a plurality of continuously arranged sampling points, the fine sand content of which is greater than the filling threshold value, into a sublayer; and dividing the formation area corresponding to a plurality of continuously arranged sampling points, wherein the corresponding fine sand content of the formation area is less than the filling threshold value.
When the content of the fine sand is greater than the filling threshold value, the sand production condition is easy to occur, and when the content of the fine sand is less than the filling threshold value, the sand production condition is not easy to occur. Therefore, according to the fact that the fine sand content is larger than the filling threshold value, and the formation regions corresponding to the plurality of sampling points which are continuously arranged are divided into a sublayer, or the formation regions corresponding to the plurality of sampling points which are continuously arranged and have the fine sand content smaller than the filling threshold value are divided into a sublayer. The sub-layers are divided reasonably, the boundaries between the sub-layers are relatively clear, and the filling of different sub-layers is easy to control.
It should be noted that the connection lengths of the plurality of sampling points which are continuously arranged and have the corresponding fine sand content greater than the filling threshold value, or the connection lengths of the plurality of sampling points which are continuously arranged and have the corresponding fine sand content less than the filling threshold value are the lengths of the sub-layers along the axis of the development well borehole.
Optionally, the filling threshold may be in a range of 5% to 10%. The space filling effect corresponding to the divided sub-layers is better, and the cost is relatively lower.
In one implementation of the present disclosure, formations with a fine sand content of less than 10% may be classified as lightly packed formations; formations with fine sand content above 10% are classified as heavily packed formations.
Formations with a fine sand content of less than 10% are typically provided with a development well that is relatively free of sand and therefore can be classified as lightly packed formations. The stratum with the fine sand content higher than 10% has serious sand production of the arranged development well, so the stratum can be classified as a heavy filling stratum.
S202: the outer pipe column of the development well completion pipe column comprises light filling sieve pipes and heavy filling sieve pipes which are alternately connected, the length of each light filling sieve pipe is equal to the length of the corresponding light filling stratum along the axis of the development well borehole, and the length of each heavy filling sieve pipe is equal to the length of the corresponding heavy filling stratum along the axis of the development well borehole.
Before the development well completion pipe string is lowered, an outer pipe string of the development well completion pipe string is divided into a light filling sieve pipe and a heavy filling sieve pipe. And the filling of different degrees on the light filling stratum and the heavy filling stratum is convenient to follow.
It should be noted that the distribution of the light-packed and heavy-packed screens in the direction from one end of the development well completion string to the other end of the development well completion string may be the same as the distribution of the light-packed and heavy-packed formations from bottom to top of the development well bore.
S203: and lowering the development well completion pipe string in the development well borehole, so that a plurality of separation spaces arranged along the extension direction of the development well borehole are formed between the formations of the development well completion pipe string, and each space corresponds to one sub-layer.
S204: and sequentially introducing mortar containing gravels into each space in the direction from the bottom to the top of the well hole of the development well.
The implementation step of step S204 may refer to the use step of developing a well completion string as described in fig. 1.
S205: for the refilled stratum, filling the space corresponding to the refilled stratum with gravels, and infiltrating the gravels into the refilled stratum; for a lightly packed formation, the gravel fills the space corresponding to the lightly packed formation.
Optionally, step S205 includes:
for any space, acquiring the length of the sublayer, corresponding to the space, of the sublayer along the axis of the borehole of the development well; determining the volume of the filling mortar required by the sublayer according to the length of the sublayer; and (3) introducing mortar containing gravels into the space until the volume of the consumed mortar is equal to that of the filled mortar.
Determining the volume of the filling mortar required by the sublayer according to the length of the sublayer; the effect of filling the space can be ensured, and the mark of the filling end of the space can be easily determined.
Optionally, determining the volume of the filling mortar required by the sub-layer according to the length of the sub-layer comprises:
when the sublayer is a refilled stratum, the ratio of the length of the sublayer to the volume of the refilled mortar is 1: 0.1-1: 0.3; when the sub-layer is a light filling stratum, the ratio of the length of the sub-layer to the volume of the heavy filling mortar is 10: 0.22-10: 0.25.
The ratio of the length of the sub-layer to the volume of the refill mortar is 1: 0.1-1: 0.3; when the sub-layer is a light filling stratum, the ratio of the length of the sub-layer to the volume of the heavy filling mortar is 10: 0.22-10: 0.25. The cost can be reduced as much as possible while ensuring that the formation is filled.
Optionally, obtaining a sub-layer length of the spatially corresponding sub-layer along an axis of the development well wellbore comprises:
the length of the corresponding sublayer with the fine sand content larger than the filling threshold value is the length of the sublayer; or the length of the corresponding sub-layer with the fine sand content smaller than the filling threshold is the length of the sub-layer.
And under the condition that the sub-layer is divided, measuring the length of the sub-layer to obtain the length of the sub-layer. Facilitating the determination of the length of the sub-layer.
In an implementation manner of the present disclosure, based on the determination of the sampling points in step S202, the connection lengths of the plurality of sampling points that are continuously arranged and have the corresponding fine sand contents greater than the filling threshold, or the connection lengths of the plurality of sampling points that are continuously arranged and have the corresponding fine sand contents less than the filling threshold may also be used as the sublayer lengths.
Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited to the above embodiments, and various changes and modifications may be made by those skilled in the art without departing from the scope of the invention.
Claims (10)
1. A method of gravel packing a well for a development well, comprising:
dividing a stratum into a plurality of sublayers according to the distribution condition of the fine sand content of the stratum through which a well bore passes in an oil and gas reservoir area, wherein each sublayer is one of a heavily filled stratum and a lightly filled stratum, and the fine sand content of the lightly filled stratum is less than that of the heavily filled stratum;
lowering a development well completion string in the development well borehole so that a plurality of separation spaces arranged along the extension direction of the development well borehole are formed between the stratums of the development well completion string, wherein each space corresponds to one sub-layer;
sequentially introducing mortar containing gravels into each space in the direction from the bottom to the top of the well hole of the development well;
wherein, for the heavy filling stratum, the gravel fills the space corresponding to the heavy filling stratum, and the gravel is infiltrated into the heavy filling stratum; and for the light filling stratum, filling the space corresponding to the light filling stratum with the gravel.
2. The method of claim 1, wherein the step of dividing the formation into a plurality of sub-layers according to the distribution of fine sand content of the formation through which the development well bore hole passes in the oil and gas reservoir region comprises:
Acquiring the fine sand content distribution condition of a stratum through which a well bore of a development well in an oil and gas reservoir area passes;
and dividing a stratum area with the fine sand content smaller than a filling threshold value and a stratum area with the fine sand content larger than the filling threshold value into different sub-layers, wherein the sub-layer with the fine sand content smaller than the filling threshold value is a light filling stratum, and the sub-layer with the fine sand content larger than the filling threshold value is divided into a heavy filling stratum.
3. The method of gravel packing a development well of claim 2, wherein obtaining the fine sand content distribution of the formation through which the development well wellbore passes in the oil and gas reservoir region comprises:
selecting a plurality of sampling points at equal intervals along the axis of the well bore of the development well in the stratum passed by the well bore of the development well, wherein the two sampling points are respectively positioned at two ends of the well bore of the development well;
obtaining a formation sample at each of the sampling points;
and obtaining the distribution condition of the fine sand content of the stratum through which the well bore of the development well passes according to the fine sand content of the stratum sample.
4. The method of completing a gravel pack for a development well of claim 3, wherein the dividing a formation zone having a fine sand content less than a pack threshold into different sub-layers from a formation zone having a fine sand content greater than the pack threshold comprises:
Dividing the formation area corresponding to a plurality of sampling points which are continuously arranged and have the corresponding fine sand content larger than the filling threshold value into a sublayer; and dividing the formation area corresponding to a plurality of continuously arranged sampling points, the fine sand content of which is less than the filling threshold value, into a sublayer.
5. The method of completing a gravel pack for a development well of claim 2, wherein the packing threshold has a value in the range of 5% to 10%.
6. The method of completing a gravel pack for a development well according to claim 2, wherein the distance between adjacent sampling points is 5m to 10 m.
7. The gravel pack completion method for a development well according to any one of claims 1 to 6, wherein the step of sequentially introducing gravel-containing mortar into each space in a direction from the bottom to the top of the well bore of the development well comprises:
for any space, acquiring the length of the sub-layer corresponding to the space along the axis of the well bore of the development well;
determining the volume of the filling mortar required by the sublayer according to the length of the sublayer;
and introducing mortar containing gravels into the space until the volume of the consumed mortar is equal to that of the filling mortar.
8. The method of gravel packing a completion for a development well of claim 7, wherein said determining a volume of packing mortar required for the sub-layer based on the length of the sub-layer comprises:
when the sub-layer is the heavily filled formation,
the ratio of the length of the sublayer to the volume of the backfilled mortar is 1: 0.1-1: 0.3;
when the sub-layer is a lightly filled formation,
the ratio of the length of the sub-layer to the volume of the heavy filling mortar is 10: 0.22-10: 0.25.
9. The method for gravel packing a completion for a development well according to any one of claims 1 to 6, comprising:
the outer pipe column of the development well completion pipe column comprises light filling sieve pipes and heavy filling sieve pipes which are alternately connected, the length of each light filling sieve pipe is equal to the length of the corresponding light filling stratum along the axis of the development well borehole, and the length of each heavy filling sieve pipe is equal to the length of the corresponding heavy filling stratum along the axis of the development well borehole.
10. A development well completion string suitable for use in the gravel pack completion method for a development well according to any one of claims 1 to 9, comprising an outer string (1), an annular packer (2) and an inner string (3),
The outer pipe column (1) comprises a plurality of light filling sieve pipes (11) and heavy filling sieve pipes (12) which are coaxially and alternately connected, the length of each light filling sieve pipe (11) is equal to that of a corresponding light filling stratum along the axis of a development well borehole, the length of each heavy filling sieve pipe (12) is equal to that of a corresponding heavy filling stratum along the axis of the development well borehole, the light filling sieve pipes (11) and the heavy filling sieve pipes (12) are respectively provided with light communication holes (111) and heavy communication holes (121), and one annular packer (2) is coaxially connected between the adjacent light filling sieve pipes (11) and the heavy filling sieve pipes (12);
the inner pipe column (3) comprises an oil pipe (31) and a switch assembly (32), the oil pipe (31) is coaxially positioned in the outer pipe column (1), the oil pipe (31) is provided with a light filling hole (311) corresponding to each light communication hole (111) and a heavy filling hole (312) corresponding to each heavy connection through hole (121), and the switch assembly (32) is arranged on the oil pipe (31);
the oil pipe (31) comprises a plurality of barrel sections (313), a light filling hole (311) or a heavy filling hole (312) is formed in the side wall of each barrel section (313), the barrel sections (313) are sequentially and coaxially connected, the diameters of the barrel sections (313) are sequentially reduced in the axial direction of the oil pipe (31), one switch assembly (32) is arranged on the inner wall of each barrel section (313), and each switch assembly (32) on each barrel section (313) is used for opening or closing the light filling hole (311) or the heavy filling hole (312) on each barrel section (313).
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| US20020070023A1 (en) * | 1998-08-21 | 2002-06-13 | Dewayne Turner | Multi-zone completion strings and methods for multi-zone completions |
| CN1690357A (en) * | 2004-03-30 | 2005-11-02 | 施卢默格海外有限公司 | Openhole perforating device |
| US20140014337A1 (en) * | 2012-07-12 | 2014-01-16 | Schlumberger Technology Corporation | Single Trip Gravel Pack System And Method |
| CN109538172A (en) * | 2018-12-14 | 2019-03-29 | 中国石油天然气股份有限公司 | Horizontal well long well section sand control completion tubing string and construction method |
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2020
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020070023A1 (en) * | 1998-08-21 | 2002-06-13 | Dewayne Turner | Multi-zone completion strings and methods for multi-zone completions |
| CN1690357A (en) * | 2004-03-30 | 2005-11-02 | 施卢默格海外有限公司 | Openhole perforating device |
| US20140014337A1 (en) * | 2012-07-12 | 2014-01-16 | Schlumberger Technology Corporation | Single Trip Gravel Pack System And Method |
| CN109538172A (en) * | 2018-12-14 | 2019-03-29 | 中国石油天然气股份有限公司 | Horizontal well long well section sand control completion tubing string and construction method |
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