Automatic flow adjusting method for intelligent injection allocator

Abstract

The invention discloses an automatic flow adjusting method for an intelligent injection allocator, which comprises the following steps: assuming that n layers of water injection wells are arranged in total, the flow injection allocation schemes of the first layer to the nth layer are P1-Pn respectively, the actually measured water volumes of the first layer to the nth layer are F1-Fn respectively, the allowable error is W, the minimum allowable error is 1, the oil pipe pressure values of the first layer to the nth layer are Y1-Yn respectively, and the formation pressure values of the first layer to the nth layer are D1-Dn respectively, judging the qualification standard of the water injection rate of the ith layer as Pi + Wgt; figt; pi-W; the method comprises the specific steps of setting an injection allocation scheme and an allowable error, preferentially adjusting an injection stopping layer, testing the flow of each layer, the pressure of an oil pipe and the pressure of a stratum, obtaining an adjusting direction, obtaining an adjusting layer position, obtaining adjusting time, adjusting, testing a single layer and adjusting a whole well. Computer software remotely and automatically controls a motor of the intelligent injection allocator to rotate forwards and backwards, the size of a water outlet is adjusted to be larger or smaller, adjustment is carried out while testing is carried out, the requirements of the geological injection allocation scheme are finally met, and the purpose of automatic adjustment is achieved.

Description

Technical Field

[0001] The invention relates to an automatic flow regulating method for an intelligent dispenser, belonging to the technical field of oilfield exploitation. Background Art

[0002] Water drive development is the main development method of China's oil fields. At present, the stratified water injection technology has developed to the fourth generation of downhole intelligent water injection and ground intelligent control. Computer software remotely controls the downhole intelligent injector through the network to collect data and adjust the water injection volume, realizing real-time adjustment and monitoring of production data such as stratified pressure, temperature and water injection volume of the injection wells.

[0003] Each layer section of the sub-injection well is equipped with an intelligent dispenser, which has built-in flow, tubing pressure, formation pressure and temperature testing units, and an adjusting motor is arranged inside the dispenser to control the size of the water outlet for adjusting and controlling the injection volume. In order to meet the geological injection requirements for each injection layer section of the sub-injection well, the conventional method is to remotely control the motor of the intelligent dispenser in the forward and reverse direction through computer software, increase or decrease the size of the water outlet, and adjust while testing so that the water injection volume of each layer meets the injection requirements. This method is time-consuming and labor-intensive, and the operator needs certain geological expertise and on-site flow allocation experience. Summary of the invention

[0004] The purpose of the present invention is to provide a method for automatically adjusting the flow rate of an intelligent dispenser. The method uses computer software to remotely and automatically control the forward and reverse rotation of the motor of the intelligent dispenser through the dispenser scheme, allowable error and measured water volume, and adjust the size of the water outlet while testing, so as to finally meet the requirements of the geological dispenser scheme and achieve the purpose of automatic adjustment.

[0005] The technical solution of the present invention is a method for automatically adjusting the flow rate of an intelligent dispenser. Assuming that there are n layers of water injection wells, the flow rate allocation schemes from the first layer to the nth layer are P1 to P2 respectively. n The measured water volumes from the 1st to the nth layers are F1~F n , the allowable error is W, the minimum allowable error is 1, and the oil pipe pressure values ​​from the 1st layer to the nth layer are Y1~Y n The formation pressure values ​​from the 1st layer to the nth layer are D1 to D n The standard for judging the qualified water injection volume of the i-th layer is P i +W>F i >P i -W; Based on this traffic automatic adjustment method, follow the following steps: Set injection plan and allowable error, adjust stop injection layer first, test flow rate, tubing pressure and formation pressure of each layer, obtain adjustment direction, obtain adjustment layer position, obtain adjustment time, adjust, single layer test and full well adjustment.

[0006] In the aforementioned method for automatically adjusting the flow rate of an intelligent dispenser, the setting of the injection scheme and the allowable error is specifically as follows: the total number of layers of injection wells n and the flow rate injection schemes from the first layer to the nth layer are set as P1 to P n , the allowable error is W.

[0007] In the aforementioned method for automatic flow adjustment of an intelligent dispenser, the priority adjustment of the stop injection layer is specifically: if the flow injection plan of a layer is 0, the computer software will first close the water outlet of the layer, and the layer will no longer participate in the subsequent automatic adjustment process and is considered to be a qualified layer.

[0008] In the aforementioned method for automatically adjusting the flow rate of an intelligent dispenser, the test of the flow rate of each layer, the tubing pressure and the formation pressure is specifically as follows: the computer software tests the flow rate of each layer (F1~F n )、Oil pipe pressure(Y1~Y n ) and formation pressure (D1~D n ).

[0009] In the aforementioned method for automatically adjusting the flow rate of an intelligent dispenser, the specific method for obtaining the adjustment direction is: calculating the number of over-injection layers and under-injection layers of the water injection well, and the basis for determining the over-injection layer is F i >P i +W, the basis for judging the underfilled layer is F i <P i -W; If the number of under-injection layers is greater than or equal to the number of over-injection layers, the adjustment direction is to decrease, otherwise it is to increase; if the number of under-injection layers is 0, the adjustment direction is to decrease; if the number of over-injection layers is 0, the adjustment direction is to increase; if both the over-injection layer and the under-injection layer are 0, it means that the water injection volume of the injection well meets the requirements of the injection plan and does not need to be adjusted. It is a qualified well, and the computer software exits the automatic adjustment process.

[0010] In the aforementioned method for automatically adjusting the flow rate of an intelligent dispenser, the specific method for obtaining the adjustment layer is: if the adjustment direction is to adjust down, the layer with the largest relative error in the super-injection layer is taken as the adjustment layer, and the relative error calculation formula is (F i -P i ) / P i ; If the adjustment direction is to increase, the layer with the largest relative error in the underfilled layer is taken as the adjustment layer. The relative error calculation formula is (P i -F i ) / P i .

[0011] In the aforementioned method for automatically adjusting the flow rate of an intelligent dispenser, the adjustment time is specifically obtained as follows: when F i -P iWhen the absolute value of T>20, the adjustment time is 20 seconds; when T>10, the adjustment time is 10 seconds; when T>5, the adjustment time is 5 seconds; when T>3, the adjustment time is 3 seconds; when T≤3, the adjustment time is 1 second; if the adjustment direction is to decrease, and (Y i -D i )<0.1, the adjustment time is multiplied by 2.

[0012] In the aforementioned method for automatic flow regulation of an intelligent dispenser, the regulation specifically includes: the computer software regulates the water outlet of the downhole intelligent dispenser according to the regulation direction, regulation layer and regulation time obtained in the previous steps.

[0013] In the aforementioned method for automatic flow adjustment of an intelligent injector, the single-layer test is specifically as follows: after the adjustment is completed, the flow, tubing pressure and formation pressure values ​​of the adjustment layer are tested to determine whether the water injection volume is qualified; if the water outlet of the injector of this layer has been adjusted to the maximum and is still under-injected, then this layer is considered to be a qualified layer, and this layer will no longer participate in the automatic adjustment process subsequently.

[0014] In the aforementioned method for automatic flow adjustment of an intelligent injector, the whole well adjustment is specifically as follows: based on the judgment result of the single-layer test, if it is qualified, then repeat the steps of priority adjustment of the stop injection layer ~ single-layer test, repeat up to 30 times, and automatically adjust the whole well until all layers are qualified, and the software exits the automatic adjustment process; if it is unqualified, repeat the steps of obtaining the adjustment time, adjustment, and single-layer test, repeat up to 20 times, and adjust and test the layer multiple times until the water injection volume of the layer is qualified, and then repeat the steps of priority adjustment of the stop injection layer ~ single-layer test, and automatically adjust the flow of the whole well.

[0015] Beneficial effects of the present invention: Compared with the prior art, in the technical solution of the present invention, the computer software remotely and automatically controls the forward and reverse rotation of the motor of the intelligent dispenser through the injection scheme, the allowable error and the measured water volume, and adjusts the size of the water outlet while testing, so as to finally meet the requirements of the geological injection scheme and achieve the purpose of automatic adjustment. The automatic flow adjustment method is applicable to water injection wells with any number of layers. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the shape of the water outlet of the smart dispenser. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0018] An embodiment of the present invention: A method for automatically adjusting the flow rate of an intelligent dispenser, assuming that there are n layers of water injection wells, and the flow rate of the first layer to the nth layer (unit m 3 / d) The schemes are P1~P n , measured water volume from the 1st to the nth layer (unit: m 3 / d) are F1~F n , allowable error (unit: m 3 / d) is W, the minimum allowable error is 1, and the oil pipe pressure values ​​(in MPa) from the 1st layer to the nth layer are Y1~Y n The formation pressure values ​​(in MPa) from the first layer to the nth layer are D1 to D n The standard for judging the qualified water injection volume of the i-th layer is P i +W>F i >P i -W.

[0019] The automatic flow adjustment method is carried out in the following steps: 1. Set the injection plan and allowable error The total number of layers of water injection wells n and the flow allocation scheme from the 1st layer to the nth layer are set on the computer software as P1~P n , the allowable error is W.

[0020] 2. Prioritize the stop injection layer If the flow allocation plan for a layer is 0, the computer software will first close the water outlet of the layer, and the layer will no longer participate in the subsequent automatic adjustment process and is considered to be a qualified layer.

[0021] 3. Test the flow rate, tubing pressure and formation pressure of each layer Computer software tests the traffic of each layer (F1~F n )、Oil pipe pressure(Y1~Y n ) and formation pressure (D1~D n ).

[0022] 4. Get the adjustment direction Calculate the number of over-injection layers and under-injection layers of the injection well. The basis for determining the over-injection layer is F i >P i +W, the basis for judging the underfilled layer is F i <P i -W.

[0023] If the number of under-injected layers is greater than or equal to the number of over-injected layers, the adjustment direction is to reduce; if the number of under-injected layers is less than the number of over-injected layers, the adjustment direction is to increase. If the number of under-injected layers is 0, the adjustment direction is to reduce; if the number of over-injected layers is 0, the adjustment direction is to increase; if both the over-injected layers and the under-injected layers are 0, it means that the water injection volume of the water injection well meets the requirements of the injection plan and does not need to be adjusted. It is a qualified well and the computer software exits the automatic adjustment process.

[0024] 5. Get the adjustment layer If the adjustment direction is to reduce, the layer with the largest relative error in the super-injection layer is taken as the adjustment layer. The relative error calculation formula is (F i -P i ) / P i .

[0025] If the adjustment direction is to increase, the layer with the largest relative error in the underfilled layer is taken as the adjustment layer. The relative error calculation formula is (P i -F i ) / P i .

[0026] 6. Get the adjustment time When F i -P i When the absolute value T>20, the adjustment time is 20 seconds; when T>10, the adjustment time is 10 seconds; when T>5, the adjustment time is 5 seconds; when T>3, the adjustment time is 3 seconds; when T<=3, the adjustment time is 1 second.

[0027] If the adjustment direction is to decrease, and (Y i -D i )<0.1, the adjustment time is multiplied by 2.

[0028] 7. Adjustment The computer software adjusts the water outlet of the downhole intelligent injector according to the adjustment direction, adjustment layer and adjustment time obtained in steps 4, 5 and 6.

[0029] 8. Single layer test After the adjustment is completed, the flow rate, tubing pressure and formation pressure of the adjustment layer are tested to determine whether the water injection volume is qualified.

[0030] If the water outlet of the dispenser of this layer has been adjusted to the maximum and is still underfilled, then this layer is considered a qualified layer and will no longer participate in the automatic adjustment process.

[0031] 9. Full Well Adjustment According to the judgment result of step 8, if it is qualified, then repeat steps 2 to 8, and repeat up to 30 times, and automatically adjust the whole well until all layers are qualified, and the software exits the automatic adjustment process.

[0032] If it fails, repeat steps 6, 7, and 8 up to 20 times, adjust and test the layer multiple times until the water injection volume of the layer is qualified, and then repeat steps 2 to 8 to automatically adjust the flow of the entire well.

[0033] The automatic flow adjustment method of the present invention uses computer software to remotely and automatically control the forward and reverse rotation of the intelligent dispenser motor through the injection plan, allowable error and measured water volume, increase or decrease the size of the water outlet, and adjust while testing, ultimately meeting the requirements of the geological injection plan and achieving the purpose of automatic adjustment.

Claims

1. A method for automatically adjusting the flow rate of an intelligent dispenser, characterized in that: Assume that there are n layers of water injection wells, and the flow allocation schemes from the 1st layer to the nth layer are P1~P n The measured water volumes from the 1st to the nth layers are F1~F n , the allowable error is W, the minimum allowable error is 1, and the oil pipe pressure values ​​from the 1st layer to the nth layer are Y1~Y n The formation pressure values ​​from the 1st layer to the nth layer are D1 to D n The standard for judging the qualified water injection volume of the i-th layer is P i +W>F i >P i -W; Based on this traffic automatic adjustment method, follow the following steps: Set injection plan and allowable error, adjust stop injection layer first, test flow rate, tubing pressure and formation pressure of each layer, obtain adjustment direction, obtain adjustment layer position, obtain adjustment time, adjust, single layer test and full well adjustment.

2. The method for automatically adjusting the flow rate of an intelligent dispenser according to claim 1, characterized in that: The specific setting of the injection scheme and the allowable error is as follows: the total number of layers of injection wells n and the flow injection scheme from the first layer to the nth layer are set as P1 to P n , the allowable error is W.

3. The method for automatically adjusting the flow rate of an intelligent dispenser according to claim 1, characterized in that: The priority adjustment of the stop injection layer is specifically: if the flow allocation plan of a layer is 0, the computer software will first close the water outlet of the layer, and the layer will no longer participate in the subsequent automatic adjustment process and is considered to be a qualified layer.

4. The method for automatically adjusting flow rate of an intelligent dispenser according to claim 1, characterized in that: The specific test of the flow rate of each layer, the tubing pressure and the formation pressure is as follows: the computer software tests the flow rate of each layer (F1~F n )、Oil pipe pressure(Y1~Y n ) and formation pressure (D1~D n ).

5. The method for automatically adjusting flow rate of an intelligent dispenser according to claim 1, characterized in that: The specific method of obtaining the adjustment direction is: calculating the number of over-injection layers and under-injection layers of the water injection well, and the basis for determining the over-injection layer is F i >P i +W, the basis for judging the underfilled layer is F i <P i -W; If the number of under-injection layers is greater than or equal to the number of over-injection layers, the adjustment direction is to decrease, otherwise it is to increase; if the number of under-injection layers is 0, the adjustment direction is to decrease; if the number of over-injection layers is 0, the adjustment direction is to increase; if both the over-injection layer and the under-injection layer are 0, it means that the water injection volume of the injection well meets the requirements of the injection plan and does not need to be adjusted. It is a qualified well, and the computer software exits the automatic adjustment process.

6. The method for automatically adjusting flow rate of an intelligent dispenser according to claim 1, characterized in that: The specific method of obtaining the adjustment layer position is: if the adjustment direction is to reduce, the layer with the largest relative error in the super injection layer is taken as the adjustment layer, and the relative error calculation formula is (F i -P i ) / P i ; If the adjustment direction is to increase, the layer with the largest relative error in the underfilled layer is taken as the adjustment layer. The relative error calculation formula is (P i -F i ) / P i .

7. The method for automatically adjusting flow rate of an intelligent dispenser according to claim 1, characterized in that: The specific acquisition adjustment time is: when F i -P i When the absolute value of T>20, the adjustment time is 20 seconds; when T>10, the adjustment time is 10 seconds; when T>5, the adjustment time is 5 seconds; when T>3, the adjustment time is 3 seconds; when T≤3, the adjustment time is 1 second; if the adjustment direction is to decrease, and (Y i -D i )<0.1, the adjustment time is multiplied by 2.

8. The method for automatically adjusting flow rate of an intelligent dispenser according to claim 1, characterized in that: The adjustment specifically includes: the computer software adjusts the water outlet of the underground intelligent injection device according to the adjustment direction, adjustment layer and adjustment time obtained in the previous steps.

9. The method for automatically adjusting flow rate of an intelligent dispenser according to claim 1, characterized in that: The single-layer test is specifically as follows: after the adjustment is completed, the flow rate, tubing pressure and formation pressure values ​​of the adjustment layer are tested to determine whether the water injection volume is qualified; if the water outlet of the layer's injection device has been adjusted to the maximum and is still under-injected, then the layer is considered to be a qualified layer, and the layer will no longer participate in the automatic adjustment process subsequently.

10. The method for automatically adjusting flow rate of an intelligent dispenser according to claim 1, characterized in that: The whole well adjustment is specifically as follows: according to the judgment result of the single layer test, if it is qualified, then the priority adjustment stop injection layer ~ single layer test steps are repeated, and the number of repetitions is up to 30 times, and the whole well is automatically adjusted until all layers are qualified, and the software exits the automatic adjustment process; If it fails, repeat the steps of obtaining the adjustment time, adjustment, and single-layer testing, and repeat it up to 20 times. Perform multiple adjustments and tests on the layer until the water injection volume of the layer is qualified. Then repeat the steps of priority adjustment of the stop injection layer ~ single-layer testing, and automatically adjust the flow of the entire well.

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