CN106321076B - Water injection well starting pressure testing method - Google Patents
Water injection well starting pressure testing method Download PDFInfo
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- CN106321076B CN106321076B CN201610912797.1A CN201610912797A CN106321076B CN 106321076 B CN106321076 B CN 106321076B CN 201610912797 A CN201610912797 A CN 201610912797A CN 106321076 B CN106321076 B CN 106321076B
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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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
Abstract
The invention relates to a method for testing the starting pressure of a water injection well, belonging to the technical field of petroleum exploration, development and testing processes. The water injection well starting pressure testing method is characterized in that a water distribution pipe column is utilized to divide the water injection well into N water injection layers, the corresponding relation between the opening flow and the closing flow of water injection layer sections corresponding to different flow grades is established, and the pressure corresponding to the starting flow of each water injection layer is determined. The invention has the beneficial effects that: the problem of under the real oil reservoir condition water injection well logging water injection zone start pressure data error big is solved, pressure, the flow grade difference of water injection well water injection zone section have finely been divided, and the start pressure data of logging is quick accurate, detailed reliable, provides technical support for the meticulous injection and production adjustment of oil-water well in oil field.
Description
Technical Field
The invention relates to a method for testing the starting pressure of a water injection well, belonging to the technical field of petroleum exploration, development and testing processes.
Background
In the later stage of oil field development, fine water injection is an important means for cost reduction, efficiency improvement and high-efficiency development. Because the difference of the starting pressures of different intervals causes uneven water absorption of each water injection interval, a layered injection allocation measure is adopted to control the water absorption of the main layer interval and improve the water absorption capacity of the middle-low permeability interval, thereby continuously improving the water driving degree. Rock physical experiments and test data show that water injection pressure is one of important factors influencing water absorption of a water injection layer section of a water injection well, and the low-seepage layer section which does not absorb water originally begins to absorb water along with the increase of the water injection pressure. According to the seepage theory, the seepage of fluid in the stratum has starting pressure, and the seepage stratum can absorb water only if the water injection pressure overcomes the starting pressure of the seepage stratum. The conventional starting pressure testing method of the water injection well is interfered by the level difference of the layer section, and the recorded starting pressure data has large error.
ZL200910090075.2 discloses a starting pressure testing method for a low-permeability reservoir, which simulates the temperature and pressure conditions of an oil reservoir by using a long core (0.8-1.5m) and a multi-pressure measuring point model holder to carry out starting pressure testing, and a laboratory method is a method combining a differential pressure-flow method and a pressure drop method and researches the non-Darcy seepage rule and the starting pressure gradient of the low-permeability reservoir by using pressure measuring points in the long core. The method is a laboratory method and has certain difference with a field test method, the test method only tests the starting pressure of a single low-permeability core, but the starting pressures of all reservoirs cannot be completely measured for water injection wells with serious heterogeneity, namely high, medium and low-permeability reservoirs, and the pressure in the core is adjusted at low pressure or normal pressure in the experimental process, so that the test of the starting pressures of a plurality of water injection intervals in different temperature and pressure environments under the oil reservoir condition cannot be really simulated.
Disclosure of Invention
The invention aims to solve the defect that the starting pressure of all reservoirs cannot be completely measured for a water injection well with severe heterogeneity, namely high, medium and low permeability reservoirs, only by performing the starting pressure test on a single low permeability core in the prior art, and further provides a water injection well starting pressure test method.
The invention achieves the above objects by the following technical scheme.
A water injection well starting pressure testing method is characterized in that a water distribution pipe column is utilized to divide a water injection well into N water injection layers, the corresponding relation between the opening flow and the closing flow of water injection layer sections corresponding to different flow grades is established, and the pressure corresponding to the starting flow of each water injection layer is determined.
The water injection well starting pressure testing method comprises the following steps:
(1) dividing the water injection well into N water injection layers by using a water distribution pipe column;
(2) determining the initial flow Q of the water injection well by using the water absorption profile data of the water injection well or the test precision of a tester calibrated by a manufacturerFirst stage；
(3) Gradually increasing the injection allocation flow grade, and measuring the closing flow of each water injection layer in each water injection layer section corresponding to each flow grade;
(4) reducing the injection allocation flow grade step by step, and measuring the opening flow of each water injection layer in each water injection layer section corresponding to each flow grade;
(5) and (4) establishing a corresponding relation between the closing flow of the step (3) and the opening flow of the step (4), and determining the pressure corresponding to the starting flow of each water injection layer.
In the step (3), the injection allocation flow rate grade is gradually increased, and the step of measuring the closing flow rate of each water injection layer in the water injection layer section corresponding to each flow rate grade is as follows:
(3.1) improving the injection allocation flow rate grade, dividing the water injection layer with the flow rate higher than the initial flow rate into a water injection layer section, measuring the closing flow rate of each water injection layer in the water injection layer section, and closing each water injection layer in the water injection layer section by using a water distribution pipe column;
and (3.2) repeating the step (3.1) and dividing the water injection layer section until the closed flow of each water injection layer in the water injection layer section corresponding to each flow grade is measured.
In the step (4), the injection allocation flow rate grade is reduced step by step, and the step of measuring the opening flow rate of each water injection layer in the water injection layer section corresponding to each flow rate grade is as follows:
(4.1) reducing the injection allocation flow rate grade, opening each water injection layer in the water injection layer section by using a water distribution pipe column, and measuring the opening flow rate of each water injection layer in the water injection layer section;
and (4.2) repeating the step (4.1) until the opening flow of each water injection layer in the water injection layer interval corresponding to each flow grade is measured.
The invention has the beneficial effects that: the problem of under the real oil reservoir condition water injection well logging water injection zone start pressure data error big is solved, pressure, the flow grade difference of water injection well water injection zone section have finely been divided, and the start pressure data of logging is quick accurate, detailed reliable, provides technical support for the meticulous injection and production adjustment of oil-water well in oil field.
Drawings
FIG. 1 is a block flow diagram of the present invention;
FIG. 2 is a schematic illustration of the test string configuration of the present invention;
FIG. 3 is a graphical illustration of pressure versus flow curves for an embodiment of the present invention;
FIG. 4 is a graphical representation of the pressure versus flow rate for a comparative example of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As can be seen from fig. 1 and 2, a method for testing the starting pressure of a water injection well, for example, a certain water injection well, separates the water injection well into 7 water injection layers by using a concentric water distribution pipe column 9, establishes a corresponding relationship between the opening flow and the closing flow of the water injection layer sections corresponding to different pressure levels, and determines the pressure corresponding to the starting flow of each water injection layer, specifically comprising the following steps:
1. as shown in fig. 2, the number of water distributors on the concentric water distribution pipe column 9 is the same as that of 7 water injection layers, and each water injection layer is separated by a packer;
2. determining the initial flow Q of the water injection well by using the precision of the concentric measuring and adjusting instrument 8 calibrated by the Simestan instruments LtdFirst stageIs 6m3/d；
3. Gradually increasing the injection allocation flow grade, and measuring the closing flow of each water injection layer in each water injection layer section corresponding to each flow grade;
3.1 improving the injection allocation flow grade, and setting the total water injection amount of the water injection well to be 48m3D, well head pressure after water injection pressure is stableThe force is 10.4MPa, and the actual water absorption Q corresponding to 7 water injection layers is measured by a concentric measuring and regulating instrument 8(1)、Q(2)、Q(3)、Q(4)、Q(5)、Q(6)、Q(7)Are respectively 10.8m3/d、4.5m3/d、2.3m3/d、0m3/d、3.6m3/d、25.2m3/d、0m3D, wherein Q(1)And Q(6)Higher than initial flow rate QFirst stage＝6m3D, dividing the 1 st water injection layer and the 6 th water injection layer into a first water injection layer section, and recording the closing flow of each water injection layer in the water injection layer section, namely Q(1)、Q(6)Are respectively 10.8m3D and 25.2m3Closing the 1 st water injection layer and the 6 th water injection layer by using a concentric measuring and regulating instrument 8;
3.2 increasing the injection pressure of the injection well to adjust the injection amount to 36m3D, after the water injection pressure is stable, the pressure of the wellhead is 12.1MPa, and the concentric measuring and adjusting instrument 8 is used for measuring the actual water absorption Q corresponding to the remaining 5 water injection layers(2)、Q(3)、Q(4)、Q(5)、Q(7)Are respectively 11.8m3/d、7.3m3/d、2.8m3/d、9.3m3/d、4.1m3D, and initial flow rate QFirst stage＝6m3A comparison is made of(2)、Q(3)And Q(5)Dividing the 2 nd water injection layer, the 3 rd water injection layer and the 5 th water injection layer into a second water injection layer section higher than the initial flow, and recording the flow Q of the 2 nd water injection layer, the 3 rd water injection layer and the 5 th water injection layer(2)、Q(3)、Q(5)Are respectively 11.8m3/d、7.3m3D and 9.3m3Closing the corresponding 2 nd, 3 rd and 5 th water injection layers on the concentric water distribution pipe column by using a concentric measuring and adjusting instrument 8;
3.3 increasing the injection pressure of the injection well to adjust the injection amount to 18m3D, after the water injection pressure is stable, the pressure of the wellhead is 16.3MPa, and the concentric measuring and adjusting instrument 8 is used for measuring the actual water absorption Q corresponding to the rest 2 water injection layers(4)、Q(7)Are respectively 7.8m3D and 10.4m3D, and initial flow rateQFirst stage＝6m3D comparison, Q(4)And Q(7)Dividing the 4 th water injection layer and the 7 th water injection layer into a third water injection layer section above the initial flow, and recording the flow Q of the 4 th water injection layer and the 7 th water injection layer(4)、Q(7)Are respectively 7.8m3D and 10.4m3Closing the 4 th water injection layer and the 7 th water injection layer on the concentric water distribution pipe column by using a concentric measuring and adjusting instrument 8;
3.4 dividing all 7 water injection layers into 3 water injection layer sections, and finishing the test of the closing flow of each water injection layer in the 3 water injection layer sections under 3 flow grades;
4. reducing the injection allocation flow grade step by step, and measuring the opening flow of each water injection layer in each water injection layer section corresponding to each flow grade;
4.1 the concentric measuring and adjusting instrument 8 is used for respectively opening the 4 th water injection layer and the 7 th water injection layer in the third water injection layer section on the concentric water distribution pipe column, and the water injection pressure of the water injection well is controlled so as to adjust the water injection quantity to 30m3D, after the well head pressure is stabilized to be 18.5MPa, measuring the flow Q of the 4 th water injection layer and the 7 th water injection layer in the third water injection layer section4＇、Q7Respectively 12.3m3D and 15.8m3/d；
4.2 opening the 2 nd water injection layer, the 3 rd water injection layer and the 5 th water injection layer in the second water injection layer section on the concentric water distribution pipe column by using a concentric measuring and adjusting instrument 8 respectively, and controlling the water injection pressure of the water injection well so as to adjust the water injection quantity to 50m3D, after the water injection pressure is stable, the well head pressure is 13.5MPa, and the flow Q of the 2 nd water injection layer, the 3 rd water injection layer and the 5 th water injection layer in the second water injection layer section is measured(2)＇、Q(3)＇、P(5)Respectively 18.2m3/d、11.6m3/d、14.6m3/d；
4.3 opening the 1 st water injection layer and the 6 th water injection layer in the first water injection layer section on the concentric water distribution pipe column by using a concentric measuring and adjusting instrument 8 respectively, and controlling the water injection pressure of the water injection well so as to adjust the water injection quantity to 75m3D, after the water injection pressure is stable, the well head pressure is 11.5MPa, and the flow Q of the 1 st water injection layer and the 6 th water injection layer in the first water injection layer section is measured(1)＇、Q(6)Respectively 15.3m3/d、38.7m3/d；
4.4 the opening flow test of each water injection layer in the water injection layer section corresponding to all 3 flow grades is finished;
5. establishing a corresponding relation between the closing flow of the step 3 and the opening flow of the step 4, and determining the pressure corresponding to the starting flow of each water injection layer; tabulating the pressure and flow data of the water injection layers, see table 1, drawing pressure and flow relation curves according to the corresponding relation between the pressure and the flow of the water injection layers, and respectively determining the starting pressure P corresponding to 7 water injection layers as shown in figure 3Opener (1,2,3,4,5,6,7)。
TABLE 1 Water injection layer pressure, flow corresponding relation and starting pressure data table
Comparative example:
1. taking a certain water injection well as an example, as shown in fig. 2, according to the water absorption profile data of the water injection well, a concentric water distribution pipe column 9 is utilized to divide the water injection well into 7 water injection layers, the number of water distributors on the concentric water distribution pipe column is the same as that of the 7 water injection layers, and each water injection layer is divided by a packer;
2. according to the precision of a concentric measuring and adjusting instrument 8 calibrated by the Simestan instruments, Inc., the initial flow Q of the concentric measuring and adjusting instrument in a tested water injection well is determinedFirst stageIs 6m3/d；
3. Initial flow rate 6m determined according to step 23D, setting the total water injection quantity of the water injection well to be 48m3/d；
4. Water injection operation is carried out, the pressure of a wellhead is 10.5MPa after the water injection pressure is stable, and the concentric measuring and adjusting instrument 8 is used for measuring the actual water absorption Q corresponding to 7 water injection layers(1)、Q(2)、Q(3)、Q(4)、Q(5)、Q(6)、Q(7)Are respectively 11.2m3/d、4.5m3/d、2.4m3/d、0m3/d、3.2m3/d、26.5m3/d、0m3/d；
5. Increasing the water injection pressure of the water injection well to adjust the water injection amount to 75m3D, after the water injection pressure is stable, the pressure of a well mouth is 11.5MPa, and the concentric measuring and adjusting instrument 8 is used for measuring the actual water absorption Q corresponding to 7 water injection layers(1)、Q(2)、Q(3)、Q(4)、Q(5)、Q(6)、Q(7)Are respectively 15.3m3/d、9.2m3/d、5.4m3/d、0m3/d、7.0m3/d、38.6m3/d、0m3/d；
6. Increasing the water injection pressure of the water injection well to adjust the water injection amount to 100m3D, after the water injection pressure is stable, the pressure of a well mouth is 12.5MPa, and the concentric measuring and adjusting instrument 8 is used for measuring the actual water absorption Q corresponding to 7 water injection layers(1)、Q(2)、Q(3)、Q(4)、Q(5)、Q(6)、Q(7)Are respectively 19.3m3/d、13.6m3/d、8.6m3/d、0m3/d、10.8m3/d、51.2m3/d、0m3/d；
7. Increasing the water injection pressure of the water injection well so as to adjust the water injection quantity to 140m3D, after the water injection pressure is stable, the pressure of a wellhead is 13.5MPa, and the concentric measuring and adjusting instrument 8 is used for measuring the actual water absorption Q corresponding to 7 water injection layers(1)、Q(2)、Q(3)、Q(4)、Q(5)、Q(6)、Q(7)Are respectively 23.5m3/d、18.2m3/d、11.5m3/d、0m3/d、14.6m3/d、63.3m3/d、0m3/d；
Listing the pressure and flow data of each water injection layer, see table 2, drawing a pressure and flow relation curve according to the corresponding relation between the pressure and the flow in the water injection layer, and respectively determining the starting pressure P corresponding to 5 water injection layers as shown in figure 4Opener (1,2,3,4, 5)。
TABLE 2 Water injection layer pressure, flow corresponding relation and starting pressure data table
The embodiment shows that the water injection starting pressure values of all 7 water injection layers with serious heterogeneity can be measured by using the method, and the comparative example shows that the water injection starting pressure values of only 5 water injection layers can be determined by only improving the water injection pressure and the water injection quantity because the hypotonic layer still can not be started due to the existence of the hypertonic layer, and the water injection starting pressure values of the other 2 water injection layers with poor permeability can not be determined, so that the method solves the problem that the starting pressure of the hypotonic water injection layer of the water injection well with serious heterogeneity can not be determined.
Claims (3)
1. A method for testing the starting pressure of a water injection well is characterized by comprising the following steps: dividing the water injection well into N water injection layers by using a water distribution pipe column, establishing a linear relation between opening flow and closing flow of water injection layer sections corresponding to different flow grades, and determining pressure corresponding to the starting flow of each water injection layer; the water injection well starting pressure testing method comprises the following steps:
(1) dividing the water injection well into N water injection layers by using a water distribution pipe column;
(2) determining the initial flow Q of the water injection well by using the water absorption profile data of the water injection well or the test precision of a tester calibrated by a manufacturerFirst stage；
(3) Gradually increasing the injection allocation flow grade, and measuring the closing flow of each water injection layer in each water injection layer section corresponding to each flow grade;
(4) reducing the injection allocation flow grade step by step, and measuring the opening flow of each water injection layer in each water injection layer section corresponding to each flow grade;
(5) and (4) establishing a linear relation between the closing flow of the step (3) and the opening flow of the step (4), and determining the pressure corresponding to the starting flow of each water injection layer.
2. The water injection well start pressure test method according to claim 1, characterized in that: the step-by-step improvement of injection allocation flow grade, and the determination of the closing flow of each water injection layer in the water injection layer section corresponding to each flow grade refers to:
(3.1) improving the injection allocation flow rate grade, dividing the water injection layer with the flow rate higher than the initial flow rate into a water injection layer section, measuring the closing flow rate of each water injection layer in the water injection layer section, and closing each water injection layer in the water injection layer section by using a water distribution pipe column;
and (3.2) repeating the step (3.1) and dividing the water injection layer section until the closed flow of each water injection layer in the water injection layer section corresponding to each flow grade is measured.
3. The water injection well start pressure test method according to claim 1, characterized in that: the injection allocation flow level is reduced step by step, and the step of measuring the opening flow of each water injection layer in the water injection layer section corresponding to each flow level is as follows:
(4.1) reducing the injection allocation flow rate grade, opening each water injection layer in the water injection layer section by using a water distribution pipe column, and measuring the opening flow rate of each water injection layer in the water injection layer section;
and (4.2) repeating the step (4.1) until the opening flow of each water injection layer in the water injection layer interval corresponding to each flow grade is measured.
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| CN108507919B (en) * | 2017-02-23 | 2020-06-12 | 中国石油化工股份有限公司 | Shale full-diameter core starting pressure test method under radial flow flowing mode |
| CN111852419A (en) * | 2019-04-26 | 2020-10-30 | 中国石油天然气股份有限公司 | Separate-layer water injection pipe column, starting pressure determining method and device and cable testing and adjusting system |
| CN113006752B (en) * | 2019-12-19 | 2023-08-22 | 中国石油天然气股份有限公司 | Method and device for predicting injection pressure |
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