CN111963124A - Horizontal well gap energy supplementing asynchronous flooding production increasing method - Google Patents
Horizontal well gap energy supplementing asynchronous flooding production increasing method Download PDFInfo
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- CN111963124A CN111963124A CN202010889887.XA CN202010889887A CN111963124A CN 111963124 A CN111963124 A CN 111963124A CN 202010889887 A CN202010889887 A CN 202010889887A CN 111963124 A CN111963124 A CN 111963124A
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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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
- E21B43/14—Obtaining from a multiple-zone well
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention provides an energy supplementing asynchronous flooding production increasing method between horizontal well joints, which comprises the following steps: step 1, placing an intubation packer above a target perforation section of a pretreated horizontal well; step 2, inserting an oil pipe into the cannula packer; injecting water to the target perforation section through an oil pipe until the technological requirement is met; step 3, performing segmented acidification on the shaft; step 4, open flow, and then oil extraction is carried out on the interval above the target perforation section; step 5, open flow and well completion; before the sectional acidizing treatment, water is injected into one section or a plurality of sections of the sand body to form a high-pressure area in the sand body, then acidizing and oil extraction are carried out in other sections of the sand body, and the purpose is to solve the problem of the blockage of a near-wellbore area, and improve the yield of acidizing measures through the driving action of the high-pressure area to a low-pressure area.
Description
Technical Field
The invention belongs to the technical field of repeated transformation of horizontal wells of old oil fields, and particularly relates to an asynchronous energy-supplementing oil displacement production increasing method among horizontal well joints.
Background
At present, the problems of low yield and low efficiency of a part of horizontal wells of an oil field are caused by insufficient formation energy, blockage of a near wellbore zone, rising of water content and the like. In order to improve the efficiency and the yield of the horizontal well, more and more horizontal wells are treated to increase the yield.
The horizontal well production increasing measures comprise repeated fracturing and repeated acidification, the repeated fracturing production increasing amplitude is large, but the cost is high, the repeated acidification is low, but the problem that the near wellbore zone is blocked can only be solved, and the effective period is short.
Disclosure of Invention
The invention aims to provide an asynchronous energy-supplementing, oil-displacing and production-increasing method for horizontal well joints, which overcomes the defects of high cost and short effective period in the conventional horizontal well production-increasing method.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides an energy supplementing asynchronous flooding production increasing method between horizontal well joints, which comprises the following steps:
step 1, placing an intubation packer above a target perforation section of a pretreated horizontal well;
step 3, performing segmented acidification on the shaft;
step 4, open flow, and then oil extraction is carried out on the interval above the target perforation section;
and 5, open flow and well completion.
Preferably, in step 1, the target perforation segment is an adjacent perforation segment of the remaining oil-rich perforation segment obtained by recognizing the remaining oil distribution; and the target perforation section and the obtained residual oil-rich perforation section are the same sand body.
Preferably, in step 1, the cannula packer is arranged at a distance of 3 to 5 meters from the target perforation segment.
Preferably, in step 2, the water injection amount is greater than or equal to two thirds of the calculated water amount.
Preferably, in step 3, the specific method for performing staged acidizing on the wellbore is as follows:
firstly, two pipe-inserting packers are utilized to seal the section needing acidification;
and secondly, after a certain section of acidification is finished, unsealing the pipe inserting packer, lifting the pipe column to the last section of target perforation section needing acidification, and continuing acidification until all target perforation sections are acidified.
Preferably, in step 4, when oil extraction is performed on the interval above the target perforation section, if the yield is reduced and the variation amplitude of the liquid production amount of the well is stable, the production string is lifted when the water content is increased, the pipe insertion packer is removed by drilling and grinding, and then the production string is put into production directly; and if the yield is reduced, the water content change amplitude of the well is stable, and the liquid production amount is reduced, the production string is lifted out, an oil pipe is inserted into the pipe insertion packer, water is injected into the target perforation section, and then other sections of the same sand body are acidified.
Preferably, in step 5, if the well is completed with a production rate 80% higher than the initial modified production rate during normal production and the production pressure is reduced, the production rate of the well is limited.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides an asynchronous drive-production yield-increasing method for energy supplementation between horizontal well seams, which is characterized in that water is injected into a certain section or a plurality of sections of a sand body before segmented acidizing treatment is carried out to form a high-pressure area in the sand body, and then acidizing and oil extraction are carried out on other sections in the sand body, so that the problem of blockage of a near-well zone is solved, and the output is increased by acidizing measures through the driving action of the high-pressure area to a low-pressure area;
drawings
FIG. 1 is a schematic diagram of an acidizing column configuration in accordance with the present invention;
wherein, 1, oil pipe 2, intubate packer.
Detailed Description
The present invention is described in further detail below.
The invention provides an energy supplementing asynchronous flooding production increasing method between horizontal well joints, which comprises the following steps:
step 1, tripping out a production string, checking data, and checking the conditions of wax deposition, scaling and eccentric wear of a pipe rod of an oil pipe; cleaning the oil well with wax and scale, and replacing the oil well with serious scale for use when a production string is put into use; pretreating a horizontal well to be implemented, and dredging the well by using a drift size gauge, wherein the horizontal well is required to be communicated to an artificial well bottom; circularly washing the well, scraping to the bottom of the artificial well by using a GX140T type casing scraper, and washing the well with large discharge capacity in a reverse circulation mode until the water quality of an inlet and an outlet is consistent;
step 3, connecting a baffle valve below the cannula packer; the upper part of the cannula packer is sequentially connected with a telescopic pipe, a one-way valve and a centralizer; then, a cannula packer is placed above the target interval by means of cable-conveyed setting or hydraulic setting: checking the setting condition of the packer, and if the setting is unsuccessful, re-setting is needed until the setting is successful; then inserting an oil pipe into the cannula packer until reaching a wellhead;
step 4, the well mouth is communicated with a water injection pipeline, water is injected into the target interval through an oil pipe to supplement the near-wellbore region stratum energy, and the pressure of the well mouth is observed in the water injection process;
step 5, pulling out the telescopic pipe, the one-way valve and the centralizer on the intubation packer, carrying out segmented acidification on other sections of the horizontal well, and dredging an oil flow channel;
step 6, discharging the liquid in the shaft through the casing, descending a production pipe column to 50m above the perforation section of the uppermost section for production, and only extracting oil from the interval above the target perforation section;
step 8, after the oil well is produced for a period of time, if the yield is reduced, judging the current production condition of the measure well, wherein the current production condition can be divided into two types, one type is a well with small variation of liquid production quantity and a rising well with water, and the other type is a well with small variation range of water content and reduced liquid production quantity;
step 9, judging the water-containing ascending well according to water-containing data of an oil well provided by the production line, if the water content is increased by more than 20%, the water-containing ascending well is considered, and for the water-containing ascending well, pulling out a production pipe column, drilling and grinding an insertion pipe packer, and putting the production pipe column into the well for direct production;
step 10, the water content variation amplitude is not large, the liquid production amount is reduced (the liquid production amount is reduced by 20%), a production pipe column is taken out, an oil pipe is inserted into an insertion pipe packer, water is injected into a target section, then other sections of the same sand body are acidified, a conventional earth acid liquid is added into each section by 20-30 directions, and the asynchronous flooding step is repeated;
step 11, open flow and well completion; controlling open flow by using a ground throttling pipeline: in the initial stage, a 4-6 mm oil nozzle is adopted for open flow, and whether the proppant is returned from the returned liquid is observed; and adjusting the size of the open flow oil nozzle according to the change of the open flow pressure, wherein the size of the open flow oil nozzle is correspondingly increased by 2-3 mm when the well head pressure is decreased by 5MPa, and the well head pressure is 2 MPa.
And step 12, in the normal production process of the measure well, the yield is 80% higher than that after the initial transformation, a pressure gauge is installed at the well mouth, the production pressure is reduced by more than 10%, production with limited yield is adopted, and after rapid pressure relief is avoided, the close-well microcracks are closed, the permeability is reduced, and the yield is rapidly reduced.
In step 2, the target interval and the obtained remaining oil-rich perforation segment belong to the same sand body.
In step 2, the position of the cannula packer is 3-5 meters above the target perforation section.
Step 4, the water injection amount is more than or equal to two thirds of the calculated water amount, wherein the calculated water amount is obtained according to the liquid amount extracted in the past year and the pressure maintaining level of the well, and the water injection amount is equal to the liquid amount extracted in the past year; if the formation pressure is kept below 80%, the amount of water injected is equal to 1.3 times the amount of liquid produced over the years from the well.
The near wellbore area stratum energy is supplemented by injecting water to the target interval through the oil pipe, the pressure of a well mouth is observed in the water injection process, the normal water injection pressure is lower than the pressure of a water injection well in the same block, the rapid water absorption process is mostly presented, the water injection speed is lower than the initial liquid production amount by 2 times, if high-pressure water injection occurs, the water injection pressure is lower than the oil layer fracture pressure, and the problem of water channeling is avoided.
In step 5, the acidification is segmented acidification, and the acid injection amount and the acid liquor formula are determined according to the length and physical properties of each perforation segment, and the specific method comprises the following steps:
(1) running the drilling tool to the corresponding position, and acidizing the tubular column as shown in the figure 1;
(2) pressure testing must be carried out before acidizing construction, and construction can be carried out after the pressure testing is qualified: the pressure test of ground pipelines and wellhead equipment is 45MPa, and no puncture and no leakage are qualified; requiring a plurality of acid pots to be simultaneously connected to an acid feeding pipeline;
(3) acidifying the first stage with about 30m of single stage acid solution3Discharge capacity of 1.0m3/min；
(4) Closing the well and reacting for 1.0 hour, if the pressure is zero, directly unsealing the lifting pipe column to a small section, and if the pressure is not zero, unsealing the lifting pipe column to a next section after open spray and reverse reaction;
(5) and after the last section of acidification is finished, closing the well for reaction for 12 hours, after the pressure of the well head is reduced to zero, performing large-discharge reverse circulation well flushing until reaction residual acid is completely returned, lifting the acidification drilling tool to the straight well section, and performing swabbing well completion.
The specific method adopting the segmented acidification is as follows:
using a double-sealing single-clamping tool to seal the section needing acidification, namely clamping the section needing acidification by using two pipe-inserting packers (usually K344 packers) from bottom to top, after acidification, moving the drilling tool, unsealing the pipe-inserting packers, lifting the pipe column, clamping the upper section, and continuing acidification; because the segmented acidification is realized, the tubular column is lifted, and multiple times of acidification operation are needed, so the well closing time is longer, if the well closing time is considered, the yield is influenced, the general acidification can also be adopted, namely, a packer is not needed, all the intervals are communicated, and the acid is added at one time.
Example 1:
the embodiment provides an asynchronous energy-supplementing, oil-displacing and production-increasing method for horizontal well gaps, which comprises the following steps:
step 1, taking out the production string, checking the data of the depth of the oil pipe in the process of running, checking the conditions of wax deposition, scaling and eccentric wear of a pipe rod of the oil pipe, cleaning the oil well with wax deposition and scaling, and replacing the oil well with serious scaling for use when the production string is run. Dredging the well by using a drift size gauge, and performing reverse circulation well washing by using a cement truck; because old wells are produced for a long time, sand spitting may occur, in order to keep a well shaft smooth, sand washing is carried out, a GX140T type casing scraper is used for scraping to the bottom of an artificial well, the well is washed in a large-discharge reverse circulation mode, and the quality of water flowing in and out from the well to the well mouth is consistent.
and 3, connecting a baffle valve below the cannula packer, connecting the upper part of the cannula with a telescopic pipe, a one-way valve and a centralizer, and placing the cannula packer above the target perforation section in a cable conveying seat sealing or hydraulic seat sealing mode. Checking the setting condition of the packer, if the setting is unsuccessful, re-setting is needed until the setting is successfully connected with the oil pipe until the well head;
step 4, a well mouth is communicated with a water injection pipeline, water is injected into the target interval through an oil pipe to supplement the near-wellbore region stratum energy, the pressure of the well mouth is observed in the water injection process, and if the pressure of the well mouth is reduced rapidly, the injection displacement can be properly increased;
step 5, pulling out the insertion pipe on the insertion pipe packer, putting a drilling tool into the corresponding position, and acidizing the pipe column as shown in the figure 1;
step 6, connecting the pipe columns to carry out shaft pressure test, and constructing after the pressure test is qualified: the pressure test of the ground pipeline and wellhead equipment is 45MPa, and the product is qualified without puncture and leakage. Multiple acid tanks are required to be simultaneously connected to the acid feeding pipeline.
Step 7, acidifying the first stage, wherein the single stage acid liquor is about 30m3Discharge capacity of 1.0m3/min。
And 8, closing the well and reacting for 1.0 hour, directly unsealing the lifting column to a small section if the pressure falls to zero, and unsealing the lifting column to the next section for acidification after open-flow and reverse washing if the pressure does not fall to zero.
And 9, after the last section of acidification is finished, closing the well for reaction for 12 hours, after the pressure of the well head is reduced to zero, performing large-discharge reverse circulation well flushing until reaction residual acid is completely returned, and lifting the acidification drilling tool to the straight well section.
Step 10, discharging liquid in a shaft through a casing, descending a production pipe column to 50m above a perforation section of the uppermost section for production, and extracting oil only for the section above a target section;
step 11, after the oil well is produced for a period of time, if the yield is reduced and the water content is increased by more than 20%, taking out the production string, drilling and grinding off the intubation packer, and putting in the production string for direct production; the water content change amplitude is not large, the liquid production amount is reduced (the liquid production amount is reduced by 20%), a production pipe column is taken out, an oil pipe is inserted into an insertion pipe packer, water is injected into a target section, then other sections of the same sand body are acidified, a conventional earth acid liquid is added into each section by 20-30 directions, and the asynchronous flooding and mining steps are repeated.
The principle of the invention is as follows:
firstly, injecting water into a certain section of the same sand body to supplement energy to form a high-pressure area, then extracting oil in other sections, and improving the oil increment by the driving action of the high-pressure area to a low-pressure area; secondly, other sections of the same sand body are subjected to long-acting acidification, so that the blockage in the sand body can be removed, and an oil flow channel can be dredged; thirdly, the subsection of the same sand body is subjected to sectional long-acting acidification, so that the blockage in the sand body can be removed, an oil flow channel is dredged, and the crack flow conductivity is increased; thirdly, injection and production are carried out by using the method provided by the invention, and because the cannula packer is permanently placed in the well, the method can be continuously applied to recover the yield after the measures are invalid, so that the purpose of sustainable yield increase of a single well is realized; and fourthly, the pipe-inserting packer is utilized to realize water injection and formation energy supplement of partial sections of the horizontal well, and other sections dredge oil flow channels through acidification, so that the construction period is short, and the cost is low.
The non-obvious parts of the above embodiments belong to the common general knowledge and the common general knowledge in the technical field, and are not described in detail herein.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (7)
1. An energy-supplementing asynchronous flooding production-increasing method among horizontal well joints is characterized by comprising the following steps:
step 1, placing an intubation packer above a target perforation section of a pretreated horizontal well;
step 2, inserting an oil pipe into the cannula packer; injecting water to the target perforation section through an oil pipe until the technological requirement is met;
step 3, performing segmented acidification on the shaft;
step 4, open flow, and then oil extraction is carried out on the interval above the target perforation section;
and 5, open flow and well completion.
2. The horizontal well gap energy-complementing asynchronous flooding production-increasing method according to claim 1, wherein in the step 1, the target perforation segment is an adjacent perforation segment of a residual oil rich perforation segment obtained according to residual oil distribution recognition; and the target perforation section and the obtained residual oil-rich perforation section are the same sand body.
3. The horizontal well gap energy-supplementing asynchronous flooding production-increasing method according to claim 1, wherein in the step 1, the pipe-inserting packer is arranged at a position 3-5 meters away from a target perforation section.
4. The horizontal well gap energy-supplementing asynchronous flooding production-increasing method according to claim 1, characterized in that in step 2, the water injection amount is greater than or equal to two-thirds of the calculated water amount.
5. The horizontal well gap energy-supplementing asynchronous flooding production-increasing method according to claim 1, characterized in that in step 3, the specific method for sectionally acidizing the wellbore is as follows:
firstly, two pipe-inserting packers are utilized to seal the section needing acidification;
and secondly, after a certain section of acidification is finished, unsealing the pipe inserting packer, lifting the pipe column to the last section of target perforation section needing acidification, and continuing acidification until all target perforation sections are acidified.
6. The horizontal well gap energy-supplementing asynchronous drive-production-increasing method according to claim 1, characterized in that in step 4, when oil extraction is performed on an interval above a target perforation segment, if the yield is reduced and the variation range of the liquid production capacity of the well is stable, and water content is increased, a production string is lifted out, drilled and ground to remove a pipe-inserting packer, and then the production string is put into the production string for direct production; and if the yield is reduced, the water content change amplitude of the well is stable, and the liquid production amount is reduced, the production string is lifted out, an oil pipe is inserted into the pipe insertion packer, water is injected into the target perforation section, and then other sections of the same sand body are acidified.
7. The horizontal well gap energy-complementing asynchronous flooding production-increasing method according to claim 1, wherein in the step 5, if the well is completed and the yield of the well is 80% higher than the yield of the well after the initial reconstruction in a normal production process and the production pressure is reduced, the production yield of the well is limited.
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2020
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| CN111502628A (en) * | 2020-01-06 | 2020-08-07 | 中国石油天然气股份有限公司 | Segmented water control acidification method for low permeability reservoir fracturing well completion horizontal well |
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