CN110630237B - Method chart for pre-fracturing well fracturing culture and post-fracturing protection and application method thereof - Google Patents
Method chart for pre-fracturing well fracturing culture and post-fracturing protection and application method thereof Download PDFInfo
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- CN110630237B CN110630237B CN201910924112.9A CN201910924112A CN110630237B CN 110630237 B CN110630237 B CN 110630237B CN 201910924112 A CN201910924112 A CN 201910924112A CN 110630237 B CN110630237 B CN 110630237B
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- 238000000034 method Methods 0.000 title claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 100
- 238000002347 injection Methods 0.000 claims abstract description 92
- 239000007924 injection Substances 0.000 claims abstract description 92
- 238000004519 manufacturing process Methods 0.000 claims abstract description 25
- 238000003825 pressing Methods 0.000 claims abstract description 20
- 238000004891 communication Methods 0.000 claims abstract description 14
- 238000012136 culture method Methods 0.000 claims abstract description 9
- 238000005065 mining Methods 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 12
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 claims description 9
- 230000001174 ascending effect Effects 0.000 claims description 2
- 239000003129 oil well Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 6
- 230000006698 induction Effects 0.000 abstract description 2
- 125000003118 aryl group Chemical group 0.000 description 7
- 238000000605 extraction Methods 0.000 description 4
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention relates to a method chart for pre-fracturing well fracturing culture and post-fracturing protection. The problem that the existing water injection adjustment for pre-pressing culture and post-pressing protection is large in subjective difference and non-uniform in specification is mainly solved. The method is characterized in that: comprises a fracturing well pre-pressure culture method chart and a post-pressure protection method chart; the using method thereof, (1) the pre-pressing culture method: (a) selecting a related quadrant according to the communication type of the water injection well and the fracturing oil well; (b) selecting related quadrants according to the injection-production well spacing of the water injection well and the fracturing oil well; (c) selecting a relevant quadrant according to the accumulated injection-production ratio of the water injection well; (d) further finding out the culture time before pressing; (2) the protection method after pressing comprises the following steps: (a) selecting a related quadrant according to the communication type of the water injection well and the fracturing oil well; (b) selecting the relevant quadrant according to the water-containing limit of the fracturing well in the selected quadrant; (c) and protecting after pressing. The method carries out quantitative summary and induction on the early-stage pre-stress culture and post-stress protection effects.
Description
Technical Field
The invention relates to the technical field of oilfield development, in particular to a method chart for pre-fracturing well pressure culture and post-fracturing protection and a using method thereof.
Background
Before fracturing of an oil well, in order to enhance the fracturing effect, liquid extracting is generally carried out on a water injection well communicated with the fractured oil well, namely, pre-fracturing culture work is carried out. After the oil well is fractured, in order to protect the fracturing effect, the water injection well communicated with the fractured oil well is generally reinforced or controlled to inject water, namely, the protection work after pressure is applied.
At present, the pre-pressing culture and the post-pressing protection work are carried out according to the dynamic change of an oil-water well and the artificial experience. Thus, the water injection adjustment of pre-pressing culture and post-pressing protection has the problems of large subjective difference, non-uniform specification, low pertinence and the like.
Disclosure of Invention
The invention provides a method chart for pre-fracturing well pressure culture and post-fracturing protection, which aims to solve the problems of large subjective difference, non-uniform specification and weak pertinence of water injection adjustment of the existing pre-fracturing culture and post-fracturing protection in the background art. The method chart for the fracturing well pre-fracturing culture and post-fracturing protection carries out quantitative summary and induction on the effects of early-stage pre-fracturing culture and post-fracturing protection, quantifies the adjusting time and water injection strength of a water injection well during pre-fracturing culture and post-fracturing protection, and guides the future pre-fracturing culture and post-fracturing protection work. The invention also provides a use method of the method chart for pre-fracturing well pressure culture and post-fracturing protection.
The invention can solve the problems by the following technical scheme: a method chart of pre-fracturing well-pressure culture and post-fracturing protection comprises a pre-fracturing well-pressure culture method chart and a post-fracturing protection method chart:
the pre-pressing culture method chart is divided into 3 quadrant intervals on a circular plate according to the communication type of a water injection well and a fracturing well, thick injection thick mining, thick injection thin mining and thin injection thick mining; in each quadrant interval, dividing into 4 radian ranges according to the injection and production well distance of the water injection well and the fracturing well, wherein the distances are 200-; in each radian range, dividing the water injection well into 2 radian ranges with the radian below 1.4 and the radian above 1.4 according to the accumulated injection-production ratio of the water injection well; finding out Arabic numeral values, namely the culture strength of the water injection well, within the selected radian range; the Chinese character number corresponding to the ring where the numerical value is located, namely the cultivation time before pressing.
The post-pressing protection method chart is divided into 3 quadrant intervals on a circular plate according to the communication type of a water injection well and a fracturing well, thick injection thick mining, thick injection thin mining and thin injection thick mining; dividing each quadrant into 2 annular areas according to the water-containing limit of the fracturing well, wherein the water-containing limit is less than 40% and more than 40%; when the water content is less than 40%, the water content is further divided into 2 annular subregions: the liquid volume reduction is more than 10% and the liquid volume reduction is less than 10%; when the water content is more than 40%, the water content is further divided into 2 annular subregions: the water cut rise is higher than 5% and the water cut rise is lower than 5%. In the selected annular area, the arc corresponds to the numerical range of the Arabic numbers of the outer ring, namely the range of the water injection strength of the after-pressure protection well.
The invention also provides a use method of the pre-fracturing well fracturing culture and post-fracturing protection plate, which comprises the following steps:
(1) the method for performing the fracturing well pre-fracturing culture by using the pre-fracturing culture method plate comprises the following steps:
(a) the chart has 3 quadrant intervals, and relevant quadrants are selected according to the communication type of the water injection well and the fracturing well, thick injection and thick production, thick injection and thin production and thin injection and thick production;
(b) in the selected quadrant, selecting a related quadrant according to the injection and production well distance of the water injection well and the fracturing well, wherein the injection and production well distance is 200-250-;
(c) in the selected quadrant, according to the accumulated injection-production ratio of the water injection well, the related quadrant is further selected below 1.4 and above 1.4;
(d) finding out an Arabic numeral value, namely the culture strength of the water injection well, in the selected quadrant; the Chinese character number corresponding to the ring where the numerical value is located, namely the pre-press culture opportunity;
(2) the method for post-press protection by using the post-press protection method plate comprises the following steps:
(a) according to the communication type of the water injection well and the fracturing well, thick injection thick mining, thick injection thin mining and thin injection thick mining, and selecting a relevant quadrant in a 3-quadrant interval of a chart;
(b) in the selected quadrant, selecting a related quadrant according to the water-containing limit of the fracturing well, wherein the water-containing limit is less than 40% and more than 40%;
(c) in the selected quadrant, the fractured well with 40% water content is used as a boundary, and the protection after pressure is realized according to the following four conditions:
firstly, the water content of the fracturing well is less than 40%, and the liquid volume reduction amplitude is more than 10%;
secondly, the water content of the fracturing well is less than 40 percent, and the liquid volume reduction is less than 10 percent;
thirdly, the water content of the fracturing well is more than 40 percent, and the water content amplitude is more than 5 percent;
fourthly, the water content of the fracturing well is more than 40 percent, and the water content amplitude is less than 5 percent;
in the selected quadrant, the arc corresponds to the outer ring Arabic numeral value range, namely the water injection strength range of the protection well after pressing.
Compared with the background technology, the invention has the following beneficial effects: the invention provides a method chart for pre-fracturing culture and post-fracturing protection, which is applied to carry out 337-well pre-fracturing culture and 392-well post-fracturing protection. After adjustment, under the condition that the thickness of the single well measure in the last year is reduced by 10 percent and the proportion of the low-efficiency well is increased by 3.5 percent, the daily oil increase of the single well of the 168 fracturing wells still reaches 2.0t, the oil increase strength is improved by 8 percent, and better measure effect and economic benefit are obtained.
Description of the drawings:
FIG. 1 is a diagram of a pre-fracturing culture method for a fracturing well-communicating water injection well in example 1 of the invention;
FIG. 2 is a diagram of a protection method after fracturing well communication water injection well fracturing in example 1 of the invention.
The specific implementation mode is as follows:
the invention will be further described with reference to the following drawings and specific embodiments:
a method for using a method plate for pre-fracturing well fracturing culture and post-fracturing protection comprises the following steps:
(1) the method for performing the fracturing well pre-fracturing culture by using the pre-fracturing culture method plate comprises the following steps:
(a) the chart has 3 quadrant intervals, and relevant quadrants are selected according to the communication type of the water injection well and the fracturing well, thick injection and thick production, thick injection and thin production and thin injection and thick production;
(b) in the selected quadrant, further selecting a related quadrant according to the injection and production well distance of the water injection well and the fracturing well, wherein the injection and production well distance is 200-250-;
(c) in the selected quadrant, according to the accumulated injection-production ratio of the water injection well, the related quadrant is further selected below 1.4 and above 1.4;
(d) finding out an Arabic numeral value, namely the culture strength of the water injection well, in the selected quadrant; the Chinese character number corresponding to the ring where the numerical value is located, namely the pre-press culture opportunity;
(2) the method for post-press protection by using the post-press protection method plate comprises the following steps:
(a) according to the communication type of the water injection well and the fracturing well, thick injection thick mining, thick injection thin mining and thin injection thick mining, and selecting a relevant quadrant in a 3-quadrant interval of a chart;
(b) dividing the selected quadrant into two annular areas according to the water-containing limit of the fracturing well, wherein the water-containing limit is less than 40% and greater than 40%;
(c) on the basis of the water content division, the water content is further divided into four annular subregions according to the liquid amount descending amplitude and the water content ascending amplitude.
One is that when the water content of the fractured well is less than 40%, the fractured well is divided into the following two annular subregions: the liquid volume reduction is more than 10 percent and less than 10 percent;
secondly, when the water content of the fractured well is more than 40%, the fractured well is divided into the following two annular sub-areas: the water content rises above 5% and the water content rises below 5%.
And selecting a corresponding circular sub-area, wherein the circular arc corresponds to the outer ring Arabic numeral value range, namely the water injection strength range of the pressed protection well.
Example 1
The invention is further explained by a method chart of the fracturing pre-well-fracturing culture and the fracturing post-fracturing protection for the Daqing oil well and the Fangyi A well.
And fracturing the aromatic A well of the oil well in 2018.
Basic conditions of well groups: the aromatic A well and the aromatic B well are positioned on the same river sand, and the communication condition is thick injection and thick extraction; the distance between the aromatic A well and the aromatic B well is 315 m; the cumulative injection-production ratio of the well group is 1.16.
And selecting a thick injection and thick extraction quadrant according to the pre-pressing culture plate, further selecting a 300-350m injection and extraction well spacing quadrant, and finally selecting an injection and extraction ratio smaller than 1.4 quadrant. The number value of the final quadrant interval is 5, and the final quadrant interval is positioned between two circular rings of Chinese character numbers 'three' and 'four'. Therefore, the aromatic B in the water injection well is cultured before being pressed for 3-4 months in advance, and the daily injection water injection intensity is adjusted to 5.0m3/m。
After 3 months of underground culture of the aromatic hydrocarbon B, fracturing the aromatic hydrocarbon A, increasing oil by 2.3t in the day after fracturing, and achieving a better effect. After fracturing, the water content of the aromatic a well was 45%. After three months, the water content increased to 53% and the water content increased 8%.
According to the post-pressing protection plate, selecting a thick injection thick mining quadrant, and then further selecting a quadrant with water content of more than 40% and water content rising of more than 5%, wherein the arc of the quadrant corresponds to the outer ring Arabic number value range of 2-5. Then the water injection intensity of the water injection well aromatic hydrocarbon B is reduced to 3.0m3/m。
Claims (1)
1. A method for using a method chart of pre-fracturing well fracturing culture and post-fracturing protection is characterized in that: the used method charts of the fracturing well pre-fracturing culture and post-fracturing protection are respectively as follows:
the pre-pressing culture method chart is divided into 3 quadrant intervals on a circular plate according to the communication type of a water injection well and a fracturing well, thick injection thick mining, thick injection thin mining and thin injection thick mining; in each quadrant interval, dividing into 4 radian ranges according to the injection and production well distance of the water injection well and the fracturing well, wherein the distances are 200-; in each radian range, dividing the water injection well into 2 radian ranges with the radian below 1.4 and the radian above 1.4 according to the accumulated injection-production ratio of the water injection well;
the post-pressing protection method chart is divided into 3 quadrant intervals on a circular plate according to the communication type of a water injection well and a fracturing well, thick injection thick mining, thick injection thin mining and thin injection thick mining; the outer circle of each quadrant interval is divided into 8 sections of circular arcs, and 2, 3, 4, 5, 6, 7, 8, 9 and 10 Arabic numerals are sequentially marked on intersection points of the circular arc lines and the outer circle of the quadrant interval; dividing each quadrant into 2 annular areas according to the water-containing limit of the fracturing well, wherein the water-containing limit is less than 40% and more than 40%; in each annular area, the liquid volume descending amplitude and the water containing ascending amplitude are taken as boundaries and further divided into the following four annular subareas for protecting after pressure application:
firstly, the water content of the fracturing well is less than 40%, and the liquid volume reduction amplitude is more than 10%;
secondly, the water content of the fracturing well is less than 40 percent, and the liquid volume reduction is less than 10 percent;
thirdly, the water content of the fracturing well is more than 40 percent, and the water content amplitude is more than 5 percent;
fourthly, the water content of the fracturing well is more than 40 percent, and the water content amplitude is less than 5 percent;
each annular subregion is distributed with a section of circular arc in each quadrant interval;
in the selected annular sub-area, the arc corresponds to the outer ring Arabic numeral value range, namely the water injection strength range of the post-pressing protection well;
the method comprises the following steps:
(1) the method for performing the fracturing well pre-fracturing culture by using the pre-fracturing culture method plate comprises the following steps:
(a) the chart has 3 quadrant intervals, and relevant quadrants are selected according to the communication type of the water injection well and the fracturing well, thick injection and thick production, thick injection and thin production and thin injection and thick production;
(b) in the selected quadrant, further selecting a related quadrant according to the injection and production well distance of the water injection well and the fracturing well, wherein the injection and production well distance is 200-250-;
(c) in the selected quadrant, according to the accumulated injection-production ratio of the water injection well, the related quadrant is further selected below 1.4 and above 1.4;
(d) finding out an Arabic numeral value, namely the culture strength of the water injection well, in the selected quadrant; the Chinese character number corresponding to the ring where the numerical value is located, namely the pre-press culture opportunity;
(2) the method for post-press protection by using the post-press protection method plate comprises the following steps:
(a) according to the communication type of the water injection well and the fracturing well, thick injection thick mining, thick injection thin mining and thin injection thick mining, and selecting a relevant quadrant in a 3-quadrant interval of a chart;
(b) in the selected quadrant, selecting a related quadrant according to the water-containing limit of the fracturing well, wherein the water-containing limit is less than 40% and more than 40%;
(c) in the selected quadrant, the fractured well with 40% water content is used as a boundary, and the protection after pressure is realized according to the following four conditions:
firstly, the water content of the fracturing well is less than 40%, and the liquid volume reduction amplitude is more than 10%;
secondly, the water content of the fracturing well is less than 40 percent, and the liquid volume reduction is less than 10 percent;
thirdly, the water content of the fracturing well is more than 40 percent, and the water content amplitude is more than 5 percent;
fourthly, the water content of the fracturing well is more than 40 percent, and the water content amplitude is less than 5 percent;
in the selected quadrant, the arc corresponds to the outer ring Arabic numeral value range, namely the water injection strength range of the protection well after pressing.
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