CN109899046B - Yield increasing and water controlling method for bottom water oil and gas reservoir horizontal well - Google Patents
Yield increasing and water controlling method for bottom water oil and gas reservoir horizontal well Download PDFInfo
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Abstract
A yield increasing and water controlling method for a horizontal well of a bottom water oil and gas reservoir. The method mainly comprises the following steps: after the length of the bottom hole at the heel part of the horizontal main base pipe is controlled, a multi-stage artificial pressure relief and liquid drainage bottom hole is arranged on the main base pipe section by section, and a flowing step-by-step pressure relief and liquid drainage passage is drawn out by oil gas at the rear section in the main base pipe through an annular passage connected with the bottom hole; the pressure distribution profile in the corresponding production section base pipe is respectively controlled through the multi-stage artificial well bottom, so that the production pressure profile is smoother as a whole than that under the working condition of the conventional cone control technology, and the bottom water front edge of the oil and gas reservoir is forced to be uniformly pushed. According to the invention, the horizontal section of the horizontal well is preset with a multi-stage artificial well bottom to assist the synchronous pressure relief of oil gas at the toe end and the heel of the horizontal well, so that the heel or high-permeability zone bottom water ridge of the horizontal well can be prevented, the production efficiency is improved, and the exploitation risk is reduced; the mining condition that the pressure profiles of the heel part and the toe end of the horizontal well are not distributed uniformly can be improved, the water exploration function is realized, and the visible water section can be plugged or dredged in time.
Description
Technical Field
The invention relates to the field of water control and recovery improvement of horizontal wells of bottom water oil and gas reservoirs.
Background
Conventional oil and gas production techniques lack flexibility and control over pressure profiles within the wellbore. The development of the horizontal well water control technology on the bottom water oil and gas reservoir still has great defects and insufficiencies: 1) the pressure profiles of the heel part and the toe part of the horizontal well are distributed unevenly, so that the formation pressure is different from the pressure difference of the toe part of the heel part of the shaft, and the bottom water ridge is caused, thereby influencing the productivity and even directly stopping the production and abandoning the well; 2) for gas reservoirs, the flow resistance is small, the variable density sieve tube, ICD, AICD and other oil reservoir water control technologies cannot be effectively applied to bottom water gas reservoirs, and the effect is weak; 3) after the oil reservoir-shaft coupling flow, the fluid flow state is further changed, and a single pipeline cannot take more effective measures to ensure that the flow state is effectively controlled, so that the bottom water of the oil-gas reservoir is ridged, and the productivity is seriously influenced. 4) The central pipe water control technology only balances one section of pressure profile, has poor flexibility, small range of covering horizontal sections and low fineness degree. 5) And a special water plugging process is required to be put into the later stage water plugging, so that the cost and the risk are increased again.
Disclosure of Invention
In order to solve the technical problems mentioned in the background technology, the invention provides a bottom water oil and gas reservoir horizontal well production increasing and water controlling method, which uses a circular-through well bottom to balance the pressure dynamic mining profile in the whole horizontal section pipe, can control water at the source in the early stage and also can control water by water invasion and water blocking in the later stage, can greatly improve the development speed of the horizontal well and the overall development benefit of an oil and gas field, and provides an important opportunity for solving the bottom water ridge problem of the bottom water oil and gas reservoir.
The technical scheme of the invention is as follows: the yield increasing and water controlling method for the horizontal well of the bottom water hydrocarbon reservoir comprises the following steps:
the first step is as follows: establishing an axial distribution diagram of in-process permeability of a horizontal well of a Y well of the X-bottom water-gas field;
the second step is that: according to the principle that the length of the heel bottom hole control horizontal production section of the main base pipe is not more than 150m and the length of the artificial bottom hole control main base pipe is not more than 30m, combining the horizontal axis distance value displayed in the horizontal well on-way permeability axial distribution diagram established in the first step, calculating the number of artificial bottom holes by using a formula (1),
dividing a main base pipe of the horizontal well, which is 150M away from a heel part, into N production sections by the formula N-M +1, wherein the arrangement position of each artificial well bottom on the main base pipe is at 1/2 of the main base pipe for controlling the production sections;
the third step: installing a plurality of supporting sliding sleeve clamping pieces on the main base pipe which is 150M away from the heel part along the axial direction on the ground according to the principle of '1 piece per 5 meters', and then respectively clamping a first, a second, an … … and an Mth annular pipe into corresponding clamping grooves of the supporting sliding sleeve clamping pieces, wherein the supporting sliding sleeve clamping pieces which need to be installed at an artificial well bottom are additionally provided with through holes;
fourthly, fixing the supporting sliding sleeve clamping piece with the through hole at the corresponding installation position on the main base pipe according to the number and the installation position of the artificial well bottom determined in the second step, punching holes at the corresponding installation position of the main base pipe and the corresponding position of one through ring pipe, and installing the supporting sliding sleeve clamping piece with the through hole at the position so that the through hole on the supporting sliding sleeve clamping piece is simultaneously communicated with the punching position of the through ring pipe and the punching position of the base pipe, thereby forming the artificial well bottom communicated with one through ring pipe and fastening by bolts;
fifthly, repeating the fourth step, and respectively forming artificial well bottoms of M annular pipes on the main base pipe;
sixthly, respectively installing packing short circuits at the control distance boundaries of all the production sections in the main base pipe 150m away from the heel according to the number of the production sections determined in the second step;
seventhly, sleeving the main base pipe connected with the whole annular pipe in the sixth step into an external sieve pipe; each circulating pipe and the artificial bottom hole corresponding to the circulating pipe and the production section on the main base pipe form a passage, and a wellhead control valve is arranged on each passage at the wellhead;
eighth step: given the daily required production total Q for a single wellGeneral assemblyThe water control design is carried out according to the following mode,
dividing the full horizontal well into D production sections with equal liquid production by using a formula 2, wherein a symbol D is the number of the production sections with equal liquid production, and a symbol LHeel partThe length of a heel bottom hole control horizontal well production section is m; symbol Lj(j is 1,2 … M) is the length of a single artificial bottom hole control horizontal well production section, the unit is M, and M is the number of the artificial bottom holes;
secondly, calculating the daily production Q required by the artificial well bottom corresponding to each circulating pipe by using a formula 3j(j ═ 1,2 … M); wherein, the symbol QjControlling the daily production of the length of a horizontal production section by a single artificial well bottom, wherein D is the number of the production sections obtained in the step I;
utilizing formula(4) Calculating the required daily production Q of the heel well bottom of the horizontal wellHeel part. Symbol QHeel partThe daily production of the control production length at the bottom of the heel well of the horizontal well;
Qheel part＝QGeneral assembly-∑Qj(j ═ 1,2 … M) formula (4)
Fourthly, calculating the wellhead set pressure value P required to be set by each wellhead valve by using the formula (5)i(ii) a Wherein the symbol Qi(i is heel, 1,2 … M) is the daily production quantity of each stage of bottom hole control production section, and is obtained by the second step and the third step; symbol KiIs Li(i ═ heel, 1,2 … M) production zones controlled separately correspond to the permeability of the reservoir along the way; symbol Li(i, heel, 1,2 … M) is the length of the control production section corresponding to each shaft bottom; symbol PeIs the bottom water reservoir pressure; symbol Pi(i heel, 1,2 … M) is wellhead set pressure; mu.sgIs the viscosity of the fluid; zgIs a compression factor; r iswIs the wellbore radius; reservoir thickness h; z is a radical ofwThe height of avoiding water is adopted;
ninth, adjusting the wellhead control valve of each passage in a flow limiting mode, and correspondingly adjusting the wellhead production pressure of each passage to the pressure value P obtained by calculation in the ninth stepi(i ═ heel, 1,2 … M), thereby forcing the fluid production profile of each production interval of the all horizontal well to be equal, and completing the early water control;
the tenth step: in the production process, after the wellhead control valve corresponding to any passage is exposed to water, the wellhead control valve of the passage is closed to timely close the shaft bottom control section, so that local water plugging is formed, and later-stage water control is realized.
The invention has the following beneficial effects:
the invention aims to provide a technical method for effectively solving the problem of single-point (single-zone) or multi-point (multi-zone) preferential coning of bottom water caused by unbalanced pressure profile distribution at the heel end and the toe end of a horizontal well or heterogeneity of an oil reservoir in the process of coupling flow of oil gas from the oil reservoir to a shaft of the horizontal well. The method is particularly suitable for planar heterogeneous reservoirs.
Compared with the prior art, the invention has the following advantages: by applying the invention, the uneven distribution of the pressure profiles of the heel part and the toe end in the exploitation process of the horizontal well can be greatly improved as shown in figure 9, the balanced industrial profile is achieved, and the oil and gas extraction speed and the development benefit of the whole oil and gas field are improved; the method is particularly suitable for developing horizontal wells of bottom water oil and gas reservoirs of heterogeneous reservoirs, can be used for controlling production of high, medium and low permeability layers in a grading and section-by-section manner, and can realize sectional mining on the on-way heterogeneous horizontal section of the horizontal well in the figure 8 in the example step one; the shape of the front edge of the bottom water can be regulated and controlled at any time in the dynamic development process, and the water-meeting section can be plugged at any time, so that the oil and gas production efficiency is improved, and the effect is not achieved in the prior art; the development process is greatly reduced by the restriction of the exploitation speed or the production pressure difference, is particularly suitable for offshore and high-risk bottom water oil and gas reservoirs, and particularly for the gas reservoirs, can improve the oil and gas exploitation speed, shorten the economic return period and reduce the economic loss caused by unpredictable risk on the premise of not influencing the productivity, and is completely superior to the prior art; the water-control device has the effects of water control of the oil-gas reservoir in the early stage and water shutoff near the end of the well casing in the later stage.
The invention utilizes the annular through well bottom to stage and segment the oil and gas reservoir, so that the bottom water control mode of the oil and gas exploitation process is more effective and diversified, the uneven distribution condition of toe-heel pressure profiles in the horizontal well shaft in the traditional production process is changed, the bottom water front edge is forced to be uniformly and stably pushed to the well bottom of the horizontal well, and the efficient development of the bottom water oil and gas reservoir is finally completed. The method for controlling the pressure profile distribution utilizes a circulating pipe to arrange a multi-stage shaft bottom and uses the circulating pipe as a main production sequence, wherein the main pipe and the circulating pipe respectively control the corresponding optimal production length.
In conclusion, the invention can prevent the horizontal well heel or the high-permeability zone bottom water from entering, improve the production efficiency and reduce the mining risk. Meanwhile, after a production sequence is added to the annular artificial well bottom, the production speed and the production sequence of each section of the base pipe can be respectively controlled, and the form of the front edge of the bottom water can be regulated and controlled at any time in the production process.
Description of the drawings:
FIG. 1 is a schematic view of an installation mode of using a downhole device to perform downhole separate production and water control of a horizontal well when the invention is applied.
FIG. 2 shows a schematic three-dimensional structure of a downhole assembly utilized in the practice of the present invention when assembled as a unit.
Fig. 3 shows a schematic view of the installation mode of the manless bottom section when the downhole device is used for performing underground separate production and water control of the horizontal well.
Fig. 4 shows a schematic view of the installation mode of the bottom section with the artificial well when the downhole device is used for performing the underground separate production and water control of the horizontal well.
Fig. 5 shows a schematic structural view of a downhole device utilized in the present invention after a through-ring tube is snapped into a support sleeve snap.
Figure 6 shows a schematic view of the installation of the support sleeve clamp and the annular pipe clamp openings for connection to an artificial well bottom in a downhole device utilized when applying the invention.
FIG. 7 shows a schematic diagram of a unit docking arrangement for extending the length of a circular through-tube in a downhole device utilized in the practice of the present invention.
FIG. 8 is an illustration of the permeability profile of a Y-well wellbore along the way when the present invention is applied.
FIG. 9 is an illustration of a Y-well wellbore pressure profile when the present invention is applied.
In the figure, 1-horizontal well horizontal section base pipe, 2-first circular through pipe, 3-second circular through pipe, 4-third circular through pipe, 5-fourth circular through pipe, 6-fifth circular through pipe, 7-sixth circular through pipe, 8-supporting sliding sleeve clamping piece, 9-artificial well bottom, 10-packing short joint, 11-external sieve pipe, 12-conventional horizontal well production pressure profile, 13-central pipe production pressure profile, 14-circular through pipe production pressure profile, 15-bolt, 16-circular through pipe butt joint unit, 17-first connecting pin and 18-second connecting pin.
The specific implementation mode is as follows:
the method of the present invention may be carried out in a specific downhole device, which will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 7, the downhole device comprises a horizontal section of horizontal well base pipe 1 and a screen 11, and is characterized in that:
the device still includes two at least support sliding sleeve fastener 8, two at least circulation pipes and two at least packing short circuit 10, packs and separates short circuit 10 and can realize totally sealed to the parent tube inner wall. As shown in fig. 2, the number of the circulation pipes is 6.
The supporting sliding sleeve clamping piece is provided with a plurality of grooves used for being inserted into the circulating pipe along the outer circumference, and the cross section shapes of the grooves are matched with the cross section shapes of the circulating pipe to realize that the circulating pipe can be clamped in the grooves.
The annular pipe is in a straight pipe shape; the annular pipes extend to a wellhead along the shape of a base pipe of the horizontal well, and a control valve corresponding to each annular pipe is installed at the wellhead.
The support sliding sleeve clamping piece is sleeved on the outer wall of the horizontal section base pipe of the horizontal well and is positioned in the sieve pipe, and the support sliding sleeve clamping piece is fixedly connected with the horizontal section base pipe of the horizontal well and does not rotate or slide relatively;
the packing short circuits are positioned in the horizontal section base pipe of the horizontal well, and an independent interval is formed between the two packing short circuits; and a connecting port is formed on the pipe wall of the horizontal section base pipe of the horizontal well corresponding to the independent interval and is connected with an artificial well bottom. The artificial shaft bottom can be a flat cylindrical structure with connecting ends at two ends, sequentially penetrates through the pipe wall of the horizontal section base pipe of the horizontal well at the position, the supporting sliding sleeve clamping piece and the annular through pipe, and is tightly fixed with the artificial shaft bottom, the supporting sliding sleeve clamping piece and the annular through pipe, and the artificial shaft bottom is used for realizing communication between the annular through pipe and the independent sections. The annular pipe encircles attached in main base pipe outer wall, between outside screen pipe and main base pipe annular space, and its control artificial shaft bottom quantity is between 2-12 according to horizontal well length and production requirement, and the annular pipe relies on the support sliding sleeve card recess to fix, and the support sliding sleeve card is supporting outside screen pipe and base pipe annular space.
When the invention is implemented, the method can be carried out according to the following steps:
the first step is as follows: as shown in fig. 8, an X-bottom water gas field Y-well horizontal well in-path permeability axial profile is established.
The second step is that: according to the principle that the length of a bottom hole control horizontal production section of a main base pipe heel is not more than 150m and the length of a horizontal section of an artificial bottom hole control base pipe is not more than 30m, combining the axial distribution data of the permeability along the path of the step-horizontal well, and utilizing a formula
And (3) calculating the number M of the artificial bottom holes, wherein each artificial bottom hole is arranged at 1/2 of the control production section, and the horizontal well is divided into N production sections by the formula N-M + 1.
The third step: installing the annular multi-channel single joint on the ground, as shown in figure 3, installing a support sliding sleeve clamp on a base pipe according to the principle of '1/5 m', then clamping the annular pipe on the support sliding sleeve clamp, and sleeving an external sieve pipe to complete the multi-channel single joint.
The fourth step: installing an annular multi-channel single piece with an artificial well bottom on the ground as shown in figure 4, determining the installation position of the artificial well bottom and a supporting sliding sleeve clamping piece with a through hole on a base pipe according to the first and second principles, punching the base pipe at the position, installing the supporting sliding sleeve clamping piece with the through hole at the position, wherein the through hole of the supporting sliding sleeve clamping piece is communicated with the punching position of the base pipe, so that the artificial well bottom can be directly formed, a flat cylindrical artificial well bottom with connecting ends at two ends can be additionally arranged, the artificial well bottom is fixed by bolts and always kept communicated with the base pipe, and repeating the third step to finish M annular multi-channel single pieces with the artificial well bottom. And then installing a plurality of packing short circuits at the bottom hole control distance boundary in the base pipe according to the principle determined in the second step.
The fifth step: the butt joint of the loop pipe unit pieces is quickly locked through pins, the base pipes are in butt joint through conventional screw threads, a single piece enters a drill hole in the butt joint of the well head, and after the single piece is connected, a well head control valve is installed on each passage at the well head.
And a sixth step: early water control by gasWell horizontal well productivity formula
The daily output Q required by a single wellGeneral assemblyHeel bottom hole control section production volume to artificial bottom hole control section production volume relationship
Number of liquid production sections is divided equally
And the production capacity of each production end is obtained according to the permeability data of the production section, the production pressure is set at the wellhead of the base pipe, and the permeability distribution data and the formula of the horizontal section in the step I are utilized
Calculating the setting pressure value of the wellhead of the annular pipe under the condition of equal yield of each production section, adjusting each annular pipe wellhead to the calculated production pressure value, adjusting the pressure profile in each horizontal production section through a wellhead valve to divide the pressure profile evenly, realizing uniform liquid production of the full horizontal section of the horizontal well, and finishing early water control; the seventh step: when any well mouth is in water breakthrough in the production process during later water control, the well bottom control section can be closed in time through the well mouth valve to form local water shutoff. The invention is further described with reference to the following examples and figures:
example 1:
basic data of an X-bottom water gas field: the gas-water interface pressure is 20MPa, the reservoir thickness is 40m, the radius of a Y horizontal well shaft is 0.05m, the gas compression factor is 0.95, the gas viscosity is 0.005 mPa.s, the water-avoiding height is 35m, and the permeability distribution of the reservoir along the horizontal section is shown in figure 8.
1. Obtaining the on-way permeability situation of the horizontal well according to the actual drilling track of the Y well and the logging data, and referring to fig. 8;
2. according to the total length L of the horizontal well, formula
Calculating the number M of artificial bottom holes, wherein in the example, the total length of the horizontal well is 300M, and then M is equal to5, N is M +1, and 6 production sections are totally formed; segmenting the horizontal well in the example of the figure 8 along the process permeability distribution according to the principle that the length of a bottom hole control horizontal production section of a main base pipe is not more than 150m, and dividing the front 150m into A production sections; according to the principle that the maximum distance of each artificial well bottom in the step two is controlled to be 30m, 150m-180m of the horizontal well is divided into a production section B, and an artificial well bottom is installed at a position 165m of the production section B; dividing the horizontal well 180m-210m into a C production section according to the principle that the maximum distance of each artificial well bottom in the step two is controlled to be 30m, and installing an artificial well bottom button at the position of 195m of the C production section; by analogy, D, E, F production sections are divided, and artificial bottom hole positions are respectively arranged at the positions of 225m, 255m and 285m along the horizontal section;
3. the annular multi-channel single joint is installed on the ground, the supporting sliding sleeve clamp is installed on the base pipe according to the principle of 1/5 m, then the annular pipe is clamped on the supporting sliding sleeve clamp, and then the annular pipe is sleeved into the external sieve pipe to form the multi-channel single joint.
4. Installing a single artificial well bottom on the ground, installing a sliding sleeve card with the artificial well bottom at preset positions of calculation results of the steps by combining with example data of a Y well in the figure 8, wherein the preset positions are respectively 165m, 195m, 225m, 255m and 285m of the horizontal well, the artificial well bottom and the annular tube are fixed by bolts and are communicated with the base tube, repeating the third step to form a multi-channel single with the artificial well bottom, and installing sealing short circuits at the junctions of every two of the control sections of the well bottom, namely 150m, 180m, 210m, 240m and 270m in the example;
5. the annular pipe unit elements are butted and quickly locked through the pins, the base pipes are butted through conventional screw threads, and after a single pipe is butted and drilled at a well head, a conventional well head valve is installed on each pipeline at the well head, so that the multiple well bottom liquid drainage is formed to respectively control the preparatory production state of the pressure profile of the production section;
6. example Y well boundary energy Pe20MPa, heel bottom hole control length 150m, KiFor heel bottom hole control production interval permeability values, 100mD, fluid viscosity μ can be looked up through horizontal well in-path permeability graph 8g0.005 mPas, compression factor zg0.95, wellbore radius rwThe thickness h of the reservoir is 0.05m, the thickness h of the reservoir is 40m, the water-avoiding height of the horizontal well is 35m, and the daily production Q of the Y well is requiredGeneral assembly60 ten thousand squares/dayThe number D of the liquid production is divided into equal sections according to the liquid production amount obtained in the step six, and the daily required production yield Q of each production section with the same quantity can be obtainedj6 ten thousand squares/day, and further by Qi＝5QjThe daily production requirement of the base pipe is 30 square/day, and the formula is totally converted into the horizontal well production capacity of the offspring of the international unit
Can obtain the set pressure value P of the base pipe wellheadi19.0MPa, namely the production pressure difference is 1.0 MPa; by using the horizontal section permeability distribution data figure 8, the corresponding permeability K of the production section of the heel bottom hole control can be foundi100mD, length Li150m and average permeability K corresponding to each artificial bottom hole control sectionj，150m-180m＝315mD，Kj，180m-210m＝246mD，Kj，210m-240m＝103mD，Kj，240m-270m＝243mD，Kj，270m-300m202mD and LjSubstituting 30m into the formula
The production pressure values of the bottom water control cone corresponding to the wellhead are respectively 19.68MPa, 19.59MPa, 19.02MPa, 19.5MPa and 19.50MPa, and production is started after the pressure values are set;
7. and (4) observing and recording the water outlet condition of each wellhead at any time in the production process, and closing the wellhead valve when the liquid carrying rate is higher than 0.9 to finish single-section water plugging.
8. The Y well is tested on site according to the steps to prove that: by using the multi-well bottom yield increasing and cone controlling gas production method, the Y well production effect is good, the pressure profile distribution of the whole horizontal well shaft is wavy as shown in figure 9, the cone controlling purpose is achieved, the daily gas production at the initial stage is 120 ten thousand square/day, the stable yield is 60-80 ten thousand square/day, the liquid carrying ratio of the conventional directional well in the same block in five years in production is 0.6, the liquid carrying ratio of the conventional horizontal well is 0.41, and the liquid carrying ratio of the multi-well bottom sub-production well is only 0.16; the yield is higher than 67% of the yield of a temporary well, and the validity period is remarkably prolonged.
Claims (1)
1. A yield increasing and water controlling method for a horizontal well of a bottom water oil and gas reservoir comprises a horizontal section main base pipe, an artificial well bottom, an external sieve pipe, a supporting sliding sleeve clamping piece, a clamping groove, a circular pipe and a packing short joint, wherein the horizontal section main base pipe is arranged on the horizontal section main base pipe; the supporting sliding sleeve clamping piece is provided with a plurality of clamping grooves used for being inserted into the annular pipe along the outer circumference, and the cross section shapes of the clamping grooves are matched with the cross section shape of the annular pipe so as to clamp the annular pipe in the clamping grooves; the annular pipes extend to a wellhead along the main base pipe of the horizontal well, and wellhead control valves corresponding to the annular pipes are installed at the wellhead; the supporting sliding sleeve clamping piece is arranged on the outer wall of the horizontal section main base pipe of the horizontal well and is positioned in the outer sieve pipe; the packing short circuit is positioned in the main base pipe of the horizontal section of the horizontal well, and an independent interval is formed between the two packing short circuits; a connecting port is formed in the pipe wall of the horizontal section main base pipe of the horizontal well corresponding to the independent section and is connected with the artificial well bottom, and the artificial well bottom sequentially penetrates through the pipe wall of the horizontal section main base pipe of the horizontal well, the supporting sliding sleeve clamping piece and the annular pipe at the position where the artificial well bottom is located and is used for achieving communication between the annular pipe and the main base pipe;
the method specifically comprises the following steps:
the first step is as follows: establishing an on-way permeability axial distribution map of the horizontal well;
the second step is that: calculating the number of artificial bottom holes by using a formula (1) according to the principle that the length of the bottom hole control horizontal production section at the heel part of the main base pipe is not more than 150m and the length of the artificial bottom hole control horizontal production section is not more than 30m by combining the horizontal axis distance value displayed in the horizontal well on-way permeability axial distribution diagram established in the first step,
wherein M is the number of artificial bottom holes, L is the length of the horizontal segment of the horizontal well,
dividing the part of the main base pipe, which is positioned at the horizontal section of the horizontal well, into N production sections from the heel of the horizontal well by using a formula N +1, dividing the part of the main base pipe, which is positioned at the horizontal section of the horizontal well, from the heel to 150 meters away from the heel into one production section which is a heel well bottom control horizontal production section, and arranging M artificial well bottoms at the part which is more than 150 meters away from the heel; dividing the part of the main base pipe, which is positioned at the horizontal section of the horizontal well, and is more than 150 meters away from the heel into a production section per 30 meters, dividing the part of the main base pipe, which is positioned at the horizontal section of the horizontal well, into M production sections in total, namely M artificial bottom hole control horizontal production sections, and arranging an artificial bottom hole at 1/2 of each artificial bottom hole control horizontal production section, so that the part of the main base pipe, which is positioned at the horizontal section of the horizontal well, is divided into a heel bottom hole control horizontal production section and M artificial bottom hole control horizontal production sections from the heel of the horizontal well, namely N production sections in total;
the third step: installing a plurality of supporting sliding sleeve clamping pieces on the main base pipe which is more than 150M away from the heel part along the axial direction on the ground according to the principle of '1 piece per 5M', and then respectively clamping a first, a second, an … … and an Mth annular pipe into corresponding clamping grooves of the supporting sliding sleeve clamping pieces, wherein the supporting sliding sleeve clamping pieces which need to be installed at an artificial well bottom are additionally provided with through holes and are communicated with the main base pipe inside;
fourthly, fixing a supporting sliding sleeve clamping piece with a through hole at a corresponding installation position on the main base pipe according to the number and the installation position of the artificial well bottom determined in the second step, punching holes at the corresponding installation position of the main base pipe and at the corresponding position of a through ring pipe, and installing the supporting sliding sleeve clamping piece with the through hole at the position so that the through hole on the supporting sliding sleeve clamping piece is simultaneously communicated with the punching position of the through ring pipe and the punching position of the main base pipe, thereby forming the artificial well bottom communicated with the through ring pipe;
fifthly, repeating the fourth step, and respectively forming artificial well bottoms of M annular pipes on the main base pipe;
sixthly, mounting packing short circuits at the junctions of every two production sections according to the number of the production sections determined in the second step;
seventhly, installing the main base pipe which is connected with the whole annular pipe in the sixth step into an external sieve pipe; each circulating pipe and the artificial bottom hole corresponding to the circulating pipe and the production section on the main base pipe form a passage, and a wellhead control valve is arranged on each passage at a wellhead;
eighth step: given the daily required production total Q for a single wellGeneral assemblyAccording to the followingThe water control design is carried out by the formula, firstly, the full horizontal well is divided into D production sections with equal liquid production by using the formula (2), wherein the symbol D is the number of the production sections with equal liquid production, and the symbol L isHeel partIs the length of the horizontal production section of the heel bottom hole control, and the unit is m; symbol LjIs the length of a single artificial bottom hole control horizontal production section, and has the unit of M, wherein j is equal to 1,2, … and M respectively; m is the number of artificial wells;
secondly, calculating the length of the daily production required by the single artificial bottom hole control horizontal production section corresponding to each annular pipe by using a formula (3)j(ii) a Wherein, the symbol QjControlling the daily production of the length of a horizontal production section by a single artificial well bottom, wherein D is the number of the production sections obtained in the step I;
thirdly, calculating the daily production quantity Q of the horizontal well heel and bottom hole control horizontal production section length by using a formula (4)Heel partSymbol QHeel partThe daily production of the horizontal well heel bottom control horizontal production section length is required;
fourthly, calculating the wellhead set pressure value P required to be set by each wellhead control valve by using the formula (5)i(ii) a Wherein the symbol QiThe daily production quantity of each level of well bottom control production section is obtained through the second step and the third step; symbol KiIs LiRespectively controlling the permeability of the production section along the corresponding reservoir; symbol LiThe lengths of the control production sections respectively corresponding to the shaft bottoms of all levels are determined; i-heel, 1,2, … … …, M;
symbol PeIs the bottom water reservoir pressure; symbol PiSetting pressure at the wellhead; mu.sgIs the viscosity of the fluid; zgIs a compression factor; r iswIs the wellbore radius; reservoir thickness h; z is a radical ofwThe height of avoiding water is adopted;
ninth step, adjusting the wellhead control valve of each passage in a flow limiting mode, and correspondingly adjusting the wellhead production pressure of each passage to the wellhead setting pressure P obtained by the calculation of the eighth stepiThereby forcing the liquid production section of each production section of the full horizontal well to be equal and finishing the early-stage water control;
the tenth step: in the production process, after the wellhead control valve corresponding to any passage is exposed to water, the wellhead control valve of the passage is closed to timely close the corresponding shaft bottom control section, so that local water plugging is formed, and later-stage water control is realized.
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| CN201910201722.6A CN109899046B (en) | 2019-03-18 | 2019-03-18 | Yield increasing and water controlling method for bottom water oil and gas reservoir horizontal well |
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| CN201225122Y (en) * | 2008-07-26 | 2009-04-22 | 大庆油田有限责任公司 | Horizontal well integral adjustable layer subsection water-shutoff tool string |
| CN101787854B (en) * | 2010-03-03 | 2013-04-24 | 西南石油大学 | Subsection well completion system of bottom water reservoir horizontal well |
| US8783348B2 (en) * | 2010-12-29 | 2014-07-22 | Baker Hughes Incorporated | Secondary flow path module, gravel packing system including the same, and method of assembly thereof |
| CN102953713B (en) * | 2011-08-18 | 2014-05-14 | 中国石油大学(华东) | Completion design method by bottom water reservoir horizontal well segregated water control |
| CN202531037U (en) * | 2012-03-09 | 2012-11-14 | 中国石油天然气股份有限公司 | Segregated completion tubular column of bottom water tight gas reservoir horizontal well |
| CN102808584B (en) * | 2012-07-27 | 2015-05-06 | 中国石油天然气股份有限公司 | Mechanical water plugging pipe column for multi-point discharge of cased hole completion multi-section fractured horizontal well and method |
| CN102966314B (en) * | 2012-11-16 | 2014-10-01 | 西南石油大学 | Horizontal well central pipe and water control method thereof |
| CN203239240U (en) * | 2013-04-10 | 2013-10-16 | 中国石油天然气股份有限公司 | Variable-permeability horizontal well segregated completion string |
| CN204041030U (en) * | 2014-05-15 | 2014-12-24 | 成都北方石油勘探开发技术有限公司 | With the horizontal well in segments completion tubular column of the close screen casing of variable orifice |
| US20150330158A1 (en) * | 2014-05-19 | 2015-11-19 | Crescent Point Energy Corp. | Apparatuses, systems, and methods for injecting fluids into a subterranean formation |
| CN105756628B (en) * | 2014-12-18 | 2018-06-19 | 思达斯易能源技术(集团)有限公司 | A kind of control water current-limiting apparatus |
| US20170218721A1 (en) * | 2016-02-02 | 2017-08-03 | Baker Hughes Incorporated | Secondary slurry flow path member with shut-off valve activated by dissolvable flow tubes |
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