CN112012713B - Deflagration fracturing acidizing layer selection operation method - Google Patents
Deflagration fracturing acidizing layer selection operation method Download PDFInfo
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- CN112012713B CN112012713B CN202010834054.3A CN202010834054A CN112012713B CN 112012713 B CN112012713 B CN 112012713B CN 202010834054 A CN202010834054 A CN 202010834054A CN 112012713 B CN112012713 B CN 112012713B
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/263—Methods for stimulating production by forming crevices or fractures using explosives
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Abstract
The invention relates to a deflagration fracturing acidizing layer selection operation method, which comprises the following steps: s1, selecting a pre-operation layer section and obtaining the permeability of the pre-operation layer section; s2, judging whether the permeability of the pre-operation layer section meets a second preset condition or not; if not, carrying out acidification operation on the mixture; if so, acquiring length data of the reservoir span and the perforation section, and judging whether the reservoir span meets a third preset condition and whether the length of the perforation section meets a fourth preset condition; if yes, setting a deflagration fracturing and acidizing operation section and operating by adopting a pipe column once; if not, setting a plurality of deflagration fracturing and acidizing operation sections and operating by adopting a plurality of strings; s3, monitoring the increment of the yield and judging whether the increment meets a seventh preset condition; if so, stopping the deflagration fracturing and acidizing operation; if not, adjusting the fifth preset condition and repeating the step S2 until the seventh preset condition is satisfied. The method standardizes and ensures the dosage of gunpowder and acid liquor; optimizing the number of operation passes; the operation safety is improved.
Description
Technical Field
The invention relates to a deflagration fracturing acidification technology, in particular to a deflagration fracturing acidification layer selection operation method.
Background
The deflagration fracturing and acidizing technology (also called high-energy gas fracturing and acidizing technology) is one of the yield-increasing measures applied to the oil field at present, high-temperature and high-pressure gas generated by deflagration fracturing is utilized to perform fracturing reformation on a stratum, and then acidizing is assisted to perform corrosion crack expansion and blockage removal. For example, the apparent water absorption index of the pilot injection of 6 wells of the Lufeng 13-1 oil field in the east of the south China sea after deflagration fracturing is increased by 3.44 times, the visual water absorption index of the pilot injection of the oil field in the east of the south China sea after acidizing is increased by 9.45 times, and the daily oil production is increased by 3 times; the leakage loss of 20Sb wells in 26-1 Huizhou oil fields after deflagration fracturing is increased from 4 barrels/hour to 4.8 barrels/hour, and the leakage loss of 20Sb wells after acidizing is increased to 33 barrels/hour, so that one shut-down oil well for two years is successfully saved.
However, most of the currently applied well conditions are single-layer wells or wells with small number of layers (the number of reservoir layers is less than three layers), the implementation effect is obvious, but under the well conditions with more reservoir layers, the well conditions are large in reservoir span, operation pipe columns need to be put down for multiple times, and the operation time efficiency is poor; the permeability is extremely poor, and the single-layer gunpowder dosage control in the deflagration fracturing technology is uneven; the measure coverage of partial layer is not enough, which results in the problems of unsatisfactory reconstruction effect and the like. Particularly, under the background that the oil field in China needs to further improve the yield of the deep low permeability reservoir oil well, the oil well is completed by adopting large-span perforation and multi-layer commingled production to improve the yield of a single well oil well, so that the problems are more prominent. Taking an ancient and near reservoir LF7-2-A7 well of an east oil field of the south China sea as an example, the number of reservoirs subjected to deflagration, fracturing and acidizing reaches up to 13 layers, the reservoir span reaches up to 367m, and the reservoir permeability is 0.1-99.4 mD. Meanwhile, the perforation section is 72.5m, and the hypotonic section (with the permeability of less than 23.6mD) occupies 46.5m, and has the characteristic that the lower the permeability, the longer the perforation section. Under the well condition, the conventional operation layer selection method adopts 5 times of operation to carry out full coverage operation on 13 layers of reservoir layers, and after the implementation, 5 layers of reservoir layers obtain remarkable effect, but for a 46.5m low-permeability section of 8 layers of reservoir layers, the perforating section is long, so that the number of pipe strings to be pulled down is saved, and the explosive for deflagration fracturing and the acid solution for acidizing are insufficient, so that the effect is not ideal.
The mainstream technology at present mainly comprises deflagration fracturing well selection conditions of Changqing oil exploration bureau (Huangyulin deflagration fracturing process technology, oil-gas well test [ J ], 1993, 2 (4): 24-33), well selection layers of high-energy gas fracturing of Western Ming Petroleum university (Liufa, application range of high-energy gas fracturing and well selection layers, Western Ming Petroleum institute's proceedings [ J ], 1992, 7 (2): 7-12) and geological lithology and well selection conditions (Qin dynasty, Wujun. high-energy gas fracturing technology ten years review, Western Ming Petroleum institute's proceedings [ J ], 1997, 12 (3): 14-17), deflagration fracturing at the downhole technology of Changqing oil exploration bureau and applicable geological conditions thereof (Haolan, Zhan, Bao Xiaohong, etc.; deflagration fracturing and applicable geological conditions thereof research [ J ]. northwest, 2001, 34(2): 88-94).
The technology mainly aims at solving the problems of pollution or physical property and the like of exploration wells, production wells, water injection wells and gas wells, and selects the well selection and stratum selection conditions for deflagration fracturing or high-energy gas fracturing; or selection conditions for deflagration fracturing or high-energy gas fracturing geological lithology; or deflagration fracturing or high energy gas fracturing permeability range, at 65mD (x 10)-3um2) If the technical implementation condition is greater than this value, other blockage removal measures can be adopted. But the technology does not solve the problems of large reservoir span and more operation trips in the deflagration fracturing acidizing operation of the multi-layer commingled production well; the permeability is extremely poor, and the dosage of single-layer gunpowder is controlled unevenly; insufficient coverage of measures, unsatisfactory reconstruction effect and the likeAnd (5) problems are solved.
Disclosure of Invention
The invention aims to provide an improved detonation fracturing acidizing layer selection operation method.
The technical scheme adopted by the invention for solving the technical problems is as follows: a deflagration fracturing acidizing layer selection operation method is constructed, and comprises the following steps:
s1, selecting a pre-operation interval for carrying out deflagration fracturing acidizing operation in the construction well according to a first preset condition, and obtaining the permeability of the pre-operation interval;
s2, judging whether the permeability of the pre-operation layer section meets a second preset condition or not;
if not, carrying out acidification operation on the pre-operation layer section;
if so, acquiring the length data of the reservoir span and the perforated segment of the pre-operation interval, and judging whether the reservoir span of the pre-operation interval meets a third preset condition and whether the perforated segment length of the pre-operation interval meets a fourth preset condition;
if the reservoir span of the pre-operation layer section meets a third preset condition and the perforation section length of the pre-operation layer section meets a fourth preset condition, setting a deflagration fracturing acidizing operation section and adopting a one-trip pipe column to perform operation, wherein the operation parameters of the deflagration fracturing acidizing operation section meet the fifth preset condition, and the distance between the operation simulation seam length and the water layer meets the sixth preset condition;
if the reservoir span of the pre-operation layer section does not meet a third preset condition and/or the perforation section of the pre-operation layer section does not meet a fourth preset condition, setting a plurality of deflagration fracturing and acidizing operation sections, and performing operation by adopting a multi-trip tubular column, wherein the operation parameters of the deflagration fracturing and acidizing operation sections all meet a fifth preset condition, and the distance between the operation simulation seam length and the water layer meets a sixth preset condition;
s3, monitoring the increment of the yield of the construction well after the operation is finished, and judging whether the increment meets a seventh preset condition;
if so, stopping the deflagration fracturing and acidizing operation;
if not, adjusting a fifth preset condition, and repeating the step S2 until the seventh preset condition is satisfied.
Preferably, the first preset condition is that the oil saturation is more than or equal to 65%, the formation pressure coefficient is more than or equal to 0.6, and the mud content is less than 30%.
Preferably, the second preset condition is that the permeability is less than or equal to 50 mD.
Preferably, the third preset condition is that the reservoir span is less than or equal to 30 m.
Preferably, the fourth preset condition is that the total length of the perforation section is less than or equal to 15 m.
Preferably, the fifth preset condition is that the dosage of the deflagration fracturing powder is more than or equal to 3kg/m, and the dosage of the acid liquor is more than or equal to 1m3/m。
Preferably, the sixth preset condition is that the distance between the operation simulation seam length and the water layer is more than or equal to 1 m.
Preferably, the seventh preset condition is that the increment multiple ratio of the reservoir is more than or equal to 1.5 times.
Preferably, in the S3 step, the adjusting of the fifth preset condition includes increasing the amount of detonation fracturing powder of the fifth preset condition, and/or increasing the amount of acid liquor of the fifth preset condition.
Preferably, in the step S3, after stopping the deflagration fracture acidizing operation, the condition parameters of the deflagration fracture acidizing operation are established into a database.
The deflagration fracturing acidizing layer selection operation method has the following beneficial effects: the deflagration fracturing acidizing layer selection operation method can select different operation modes and operation times according to pre-operation layer sections under different conditions, further can further improve the deflagration fracturing acidizing operation effect of the multi-layer combined production well, emphasizes the reconstruction strength of a low-permeability reservoir, and standardizes and ensures the use amount of gunpowder and acid liquor; the number of operation passes is optimized, so that waste of the number of deflagration fracturing operations of a medium-high permeability reservoir is avoided, and sufficient operation passes under a low-permeability large-span reservoir are ensured; the operation safety is improved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flow chart of a method of deflagration fracture acidizing formation selection operations in accordance with some embodiments of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
FIG. 1 illustrates some preferred embodiments of the deflagration fracture acidizing formation selection method of the present invention. The deflagration fracturing acidizing layer selection operation method can select different operation modes and operation times according to pre-operation layer sections under different conditions, further can further improve the deflagration fracturing acidizing operation effect of the multi-layer combined production well, emphasizes the reconstruction strength of a low-permeability reservoir, and standardizes and ensures the use amount of gunpowder and acid liquor; the number of operation passes is optimized, so that waste of the number of deflagration fracturing operations of a medium-high permeability reservoir is avoided, and sufficient operation passes under a low-permeability large-span reservoir are ensured; the operation safety is improved.
Further, in some embodiments, the deflagration fracture acidizing seam selection operation method comprises the following steps:
and S1, selecting a pre-operation interval for carrying out deflagration fracturing acidizing operation in the construction well according to the first preset condition, and obtaining the permeability of the pre-operation interval. Wherein the first preset condition is a yield potential condition, specifically, the first preset condition is that the oil saturation is more than or equal to 65%, the formation pressure coefficient is more than or equal to 0.6, and the mud content is less than 30%, and the basic well selection condition can refer to deflagration fracturing well selection conditions of Changqing oil exploration bureau (Huangyulin deflagration fracturing process technology. oil and gas well test [ J ], 1993, 2 (4): 24-33), well selection layers of high-energy gas fracturing of Western American Petroleum university (Liufa. high-energy gas fracturing application range and well selection layers. Western American Petroleum institute academy academic report [ J ], 1992, 7 (2): 7-12) and geological lithology and well selection conditions (Qin dynasty, Wu jin Jun dynasty. My institute gas fracturing technology ten years of development review. Western American Petroleum institute academic report [ J ], 1997, 12 (3): 14-17), Deflagration fracturing at the underground technical operation of the Changqing oil exploration bureau and applicable geological conditions thereof (Helianthus, Zhanqiang, Paochong and the like; deflagration fracturing and applicable geological conditions thereof research [ J ]. northwest geology, 2001, 34 (2): 88-94); the pre-operation layer section in the construction well needs to meet the requirements that the oil saturation is more than or equal to 65 percent, the formation pressure coefficient is more than or equal to 0.6, and the shale content is less than 30 percent. In some embodiments, the construction well may be an oil well. Of course, it will be appreciated that in other embodiments, the construction well may not be limited to an oil well.
Specifically, the oil saturation, the formation pressure coefficient and the shale content of the pre-operation interval are obtained, and data arrangement is carried out on the oil saturation, the formation pressure coefficient and the shale content. The oil saturation, the formation pressure coefficient and the shale content can be obtained through testing in the early stage, whether the first preset condition is met or not is judged, if yes, the permeability of the pre-operation layer section is obtained through arranging early-stage monitoring data, and if not, the pre-operation layer section needs to be replaced.
And S2, judging whether the permeability of the pre-operation layer section meets a second preset condition. Wherein, the second preset condition can be that the permeability is less than or equal to 50 mD; and the classification standard of the offshore low-permeability oilfield can be met by adopting the permeability of less than or equal to 50 mD.
If not, carrying out acidification operation on the pre-operation layer section; specifically, if the permeability of the pre-operation interval is greater than 50mD, an acidizing operation string is run into the pre-operation interval, and then an acid slug is pumped, the acid slug including, but not limited to, a pad fluid, a bulk acid, a post fluid, and a displacement fluid. The specific steps of the acidification operation can be referred to the prior patent 201610712207.0.
If so, acquiring the length data of the reservoir span and the perforated segment of the pre-operation interval, and judging whether the reservoir span of the pre-operation interval meets a third preset condition and whether the perforated segment length of the pre-operation interval meets a fourth preset condition; wherein the third preset condition is that the reservoir span is less than or equal to 30m, and the fourth preset condition is that the total length of the perforation section is less than or equal to 15 m.
If the permeability of the pre-operation interval is less than or equal to 50mD, the data of the reservoir span and the length of the perforation section are obtained by arranging the data monitored in the early stage, and whether the storage span is less than or equal to 30m or not and whether the total length of the perforation section is less than or equal to 15m or not is judged. It should be noted that in some embodiments, the lower the permeability, the higher the priority, and the higher the charge setting, because the lower the permeability, the greater the strength of the modification.
If the reservoir span of the pre-operation layer section meets a third preset condition, the perforation section length of the pre-operation layer section meets a fourth preset condition, a deflagration fracturing acidizing operation section is arranged, and one-time tubular column is adopted for operation, wherein the operation parameters of the deflagration fracturing acidizing operation section meet the fifth preset condition, and the distance between the operation simulation seam and the water layer meets the sixth preset condition; wherein, the fifth preset condition is that the dosage of the deflagration fracturing powder is more than or equal to 3kg/m, and the dosage of the acid liquor is more than or equal to 1m3M; the sixth preset condition is that the distance between the operation simulation seam length and the water layer is more than or equal to 1 m. The operation simulation seam length refers to the seam length of a single deflagration fracturing fracture calculated by deflagration fracturing design software, and the distance H from the water layer can be represented by the formula H-X/tg alpha-L or H-C/sin alpha-L. Wherein X represents the slant depth of the bottom of the operation section from the water layer, and the unit is m; c represents the vertical depth of the bottom of the operation section from the water layer, and the unit is m; α represents the angle of inclination of the well in degrees; l represents the seam length of a single seam in m.
Specifically, if the reservoir span of the pre-operation interval is less than or equal to 30m and the total length of the perforation section is less than or equal to 15m, a deflagration fracturing-acidizing operation section is arranged in the pre-operation interval, a deflagration fracturing operation tubular column is put into the pre-operation interval, and then one operation is carried out. Specifically, the deflagration fracture acidizing operation method can refer to the prior patent 201610712207.0. When deflagration fracturing acidizing operation is carried out, the dosage of deflagration fracturing gunpowder can be more than or equal to 3kg/m, and the dosage of acid liquor can be more than or equal to 1m3And m, the distance between the operation simulation seam length and the water layer is more than or equal to 1 m.
If the reservoir span of the pre-operation layer section does not meet a third preset condition and/or the perforation section of the pre-operation layer section does not meet a fourth preset condition, setting a plurality of deflagration fracture acidizing operation sections, and adopting a multi-trip tubular column for operation, wherein the operation parameters of each deflagration fracture acidizing operation section all need to meet a fifth preset condition,and the distance between the operation simulation seam length and the water layer meets a sixth preset condition, wherein the fifth preset condition is that the dosage of deflagration fracturing powder is more than or equal to 3kg/m, and the dosage of acid liquor is more than or equal to 1m3(ii)/m; the sixth preset condition is that the distance between the operation simulation seam length and the water layer is more than or equal to 1 m.
Specifically, if the pre-operation interval meets any condition that the reservoir span is greater than 30m or the total length of the perforation section is greater than 15m, a plurality of deflagration fracture acidizing operation sections can be arranged on the pre-operation interval, a deflagration acidizing operation tubular column is put into each deflagration fracture acidizing operation section, and one-time operation is carried out. Specifically, the deflagration fracture acidizing operation method can refer to the prior patent 201610712207.0. The dosage of the deflagration fracturing gunpowder can be more than or equal to 3kg/m and the dosage of the acid liquor can be more than or equal to 1m when each deflagration fracturing acidizing operation is carried out3And m, the distance between the operation simulation seam length and the water layer is more than or equal to 1 m.
S3, monitoring the increment of the yield of the construction well after the operation is finished, and judging whether the increment meets a seventh preset condition; wherein, the seventh preset condition is that the increment multiple ratio of the reservoir is more than or equal to 1.5 times; specifically, after the construction well operation is completed, the seepage fluid seeped out of the construction well is collected, the increment of the yield of the construction well is monitored and calculated by adopting a conventional monitoring method, and whether the increment is more than or equal to 1.5 times of the yield of the original reservoir stratum is judged.
If yes, stopping the deflagration fracturing and acidizing operation; and if the increment of the yield of the construction well after the operation is finished is more than or equal to 1.5 times of the yield of the original reservoir stratum, stopping the deflagration fracturing and acidizing operation, and establishing a database of the condition parameters (the condition parameters mentioned above) of the deflagration fracturing and acidizing operation after the operation is stopped, wherein the database is used as the use amount basis of the subsequent construction well with the same reservoir stratum.
If not, the fifth preset condition is adjusted, and step S2 is repeated until the seventh preset condition is satisfied. If the increment multiple ratio of the yield of the construction well after the operation is finished is 1.0-1.5 times, the measure is effective but not significant, the fifth preset condition can be adjusted, namely the dosage of the deflagration fracturing gunpowder and/or the dosage of the acid liquor can be increased, and the step S2 is repeated until the increment of the yield of the construction well after the operation is finished is larger than or equal to 1.5 times of the yield of the original reservoir.
The deflagration fracturing acidizing layer selection operation method has the following advantages:
1) further improve the detonation fracturing acidizing operation effect of the multi-layer commingled production well: the transformation force of the low-permeability reservoir is enhanced, and the dosages of gunpowder and acid liquor are standardized and ensured.
2) Reasonable technical application is carried out according to different permeability ranges: according to the reasonable definition of the low-permeability oil field of the offshore oil field, 50mD is taken as a boundary, the application of the deflagration fracturing technology of the low-permeability reservoir stratum is enhanced by concentrated firepower, and the acidification technology can be applied to medium and high permeability.
3) Optimizing the number of operation passes: the waste of deflagration fracturing operation times of a medium-high permeability reservoir is avoided, and sufficient operation times of a low-permeability large-span reservoir are ensured.
4) The operation safety is improved: the reservoir span range of 30m is set to ensure that detonation fracturing can successfully propagate detonation, and meanwhile, the weight of components for detonation fracturing, acidizing and layer selecting operation is limited, so that the unsafe condition of a heavier operation tubular column under high pressure is prevented. The total length of the perforation section is 15m as a boundary to control the total gunpowder dosage and avoid the unsafe operation of the operation pipe column due to the high pressure.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. A deflagration fracturing acidizing layer selection operation method is characterized by comprising the following steps:
s1, selecting a pre-operation interval for carrying out deflagration fracturing acidizing operation in the construction well according to a first preset condition, and obtaining the permeability of the pre-operation interval;
s2, judging whether the permeability of the pre-operation layer section meets a second preset condition;
if not, carrying out acidification operation on the pre-operation layer section;
if so, acquiring the length data of the reservoir span and the perforated segment of the pre-operation interval, and judging whether the reservoir span of the pre-operation interval meets a third preset condition and whether the perforated segment length of the pre-operation interval meets a fourth preset condition;
if the reservoir span of the pre-operation layer section meets a third preset condition and the perforation section length of the pre-operation layer section meets a fourth preset condition, setting a deflagration fracturing acidizing operation section and adopting a one-trip pipe column to perform operation, wherein the operation parameters of the deflagration fracturing acidizing operation section meet the fifth preset condition, and the distance between the operation simulation seam length and the water layer meets the sixth preset condition;
if the reservoir span of the pre-operation layer section does not meet a third preset condition and/or the perforation section length of the pre-operation layer section does not meet a fourth preset condition, setting a plurality of deflagration fracturing and acidizing operation sections, and performing operation by adopting a multi-trip tubular column, wherein the operation parameters of the deflagration fracturing and acidizing operation sections all meet a fifth preset condition, and the distance between the operation simulation seam length and the water layer meets a sixth preset condition;
the operation parameters of the deflagration fracturing acidizing operation section are the dosage of deflagration fracturing gunpowder and the dosage of acid liquor;
s3, monitoring the increment of the yield of the construction well after the operation is finished, and judging whether the increment meets a seventh preset condition;
if yes, stopping the deflagration fracturing and acidizing operation;
if not, adjusting a fifth preset condition, and repeating the step S2 until the seventh preset condition is satisfied.
2. The deflagration fracturing acidizing layer selection operation method of claim 1, wherein the first predetermined conditions are oil saturation of greater than or equal to 65%, formation pressure coefficient of greater than or equal to 0.6, and shale content of less than 30%.
3. The detonation fracture acidizing layer selection operation method according to claim 1, wherein the second preset condition is that the permeability is less than or equal to 50 mD.
4. The deflagration fracture acidizing seam selection operation method of claim 1, wherein the third predetermined condition is that the reservoir span is no greater than 30 m.
5. The deflagration fracture acidizing seam selection working method of claim 1, wherein the fourth predetermined condition is that the length of the perforation segment is less than or equal to 15 m.
6. The detonation fracturing acidizing layer selection operation method according to claim 1, wherein the fifth preset condition is that the dosage of detonation fracturing powder is more than or equal to 3kg/m, and the dosage of acid liquor is more than or equal to 1m3/m。
7. The deflagration fracture acidizing layer selection operation method of claim 1, wherein the sixth predetermined condition is that the distance between the operation simulation crack length and the water layer is more than or equal to 1 m.
8. The deflagration fracture acidizing seam selection operation method of claim 1, wherein the seventh predetermined condition is that the incremental fold ratio of the reservoir is greater than or equal to 1.5 times.
9. The detonation fracture acidizing layer selection operation method according to claim 1, wherein in the step of S3, adjusting a fifth preset condition comprises increasing the detonation fracture powder dosage of the fifth preset condition, and/or increasing the acid liquor dosage of the fifth preset condition.
10. The detonation fracture acidizing formation selection operation method according to claim 1, wherein in the step S3, after stopping the detonation fracture acidizing operation, condition parameters of the detonation fracture acidizing operation are established into a database.
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