CN109611065B - Injection system for realizing automatic adjustment of oilfield injection well by utilizing gravity and application method - Google Patents
Injection system for realizing automatic adjustment of oilfield injection well by utilizing gravity and application method Download PDFInfo
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- 230000005484 gravity Effects 0.000 title claims abstract description 76
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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
- E21B43/18—Repressuring or vacuum methods
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Abstract
The utility model provides an utilize gravity to realize injection system and application method of oil field injection well automatically regulated, it includes the flow line, the flow line water inlet is equipped with the valve port, be equipped with first pneumatic cylinder and second pneumatic cylinder on the flow line in proper order according to the rivers direction, install first piston and second piston respectively in first pneumatic cylinder and the second pneumatic cylinder, form first pressure leading mouth and second pressure leading mouth between first piston and second piston and the flow line, first piston and second piston pass through the rigid connection article and connect, be equipped with gravity loading piece on the rigid connection article, first piston one end is connected with the oil pressure valve through the control part of oil pressure valve, oil pressure valve and valve port phase-match. The injection system for automatically adjusting the oil field injection well by utilizing gravity automatically adjusts the injection pressure and controls the injection quantity, and the automatic control avoids artificial subjective factors affecting the injection effect, so that the injection data is accurate in time and fine in effect.
Description
Technical field:
the invention relates to the technical field of oilfield equipment, in particular to an injection system for realizing automatic adjustment of an oilfield injection well by utilizing gravity and a use method thereof.
The background technology is as follows:
in daily control management of oilfield injection wells, oil extraction workers need to patrol the wells every day according to a geological scheme to control injection pressure (namely oil pressure) and injection quantity, so that the injection pressure (namely oil pressure) and injection quantity are ensured to be in a required range, and control equipment is a common valve and is mostly a gate valve; the control method comprises the following steps: the method comprises the steps of inspecting a wellhead from the wellhead, recording injection pressure (oil pressure) on site, changing the injection quantity through the size of a switch valve to enable the injection pressure (oil pressure) to change to reach the required injection pressure (oil pressure) if the pressure value deviates from a scheme required pressure value, enabling the adjusted injection quantity value to be within the fluctuation range of the scheme required injection quantity, otherwise, observing for a period of time to be regarded as abnormal well reporting; the system has the advantages that the on-site well spacing is hundreds of meters, the topography road conditions are poor, the rain, snow and wind are bad, the incoming water pressure (namely the pump pressure) is unstable, the underground condition change increases objective factors such as the adjustment control frequency, and a great deal of labor force and labor time are needed, and the control effect is often poor due to subjective factors such as labor intensity, labor condition and worker level, the data is not accurate enough, the effect cannot be expected, so that the situation that the sum (theoretically equal) of the accumulated pump output of the combined station flowmeter and the accumulated injection quantity of a single well in the jurisdiction is quite different occurs.
The existing unmanned injection technology needs electricity, cables are paved, a water station is built, a large amount of electronic and electric equipment is input, an actuator is programmed, computer execution is needed, and the like, so that the early input and the later maintenance cost is extremely high, the water station is needed to be built in a mode to collect well wellhead control parts in a certain area, and the existing well wellhead control part is difficult to be compatible with the mode that the existing well wellhead control parts are distributed beside each single-well Christmas tree of which the position is determined according to a geological scheme.
The invention comprises the following steps:
the invention aims to overcome the defects of the prior art, and provides an injection system for realizing automatic adjustment of an oilfield injection well by utilizing gravity and a use method thereof, which can automatically adjust injection pressure and control injection quantity, does not need electricity, does not need extra energy consumption, is simple in subsequent maintenance, and simultaneously automatically controls artificial subjective factors which avoid influencing injection effect, so that injection data time is accurate and the effect is fine.
The invention adopts the technical scheme that: the utility model provides an utilize gravity to realize injection system of oil field injection well automatically regulated, including the flow line, the flow line water inlet is equipped with the valve port, is equipped with first pneumatic cylinder and second pneumatic cylinder behind the valve port in proper order according to the rivers direction on the flow line, installs first piston and second piston respectively in first pneumatic cylinder and the second pneumatic cylinder, the cross sectional area size of first piston is different with the cross sectional area size of second piston, forms first pressure guiding mouth and second pressure guiding mouth between first piston and second piston and the flow line, first piston and second piston are connected through the rigid connection article, be equipped with gravity loading piece on the rigid connection article, first piston and the control part of oil pressure valve be connected, oil pressure valve and valve port assorted.
The rigid connection object is a connecting rod.
The rigid connection object comprises a first rack, a second rack and a gear, wherein the first rack and the second rack are respectively connected with one ends of the first piston and the second piston, the first rack and the second rack are connected through the gear, the first rack and the second rack are respectively meshed with the gear, one side of the gear is meshed with a third rack, one end of the third rack is connected with a gravity loading piece, the first rack, the second rack and the third rack are meshed with the gear to form consistent linkage, and the first rack and the second rack are meshed with the third rack in a front-back staggered mode.
The gravity loading piece adopts one of a hydraulic jack, a gear or a lever.
The method comprises the following steps:
1) The method comprises the steps of connecting a flow pipeline into an injection pipeline, leading the liquid pressure in the flow pipeline into a first hydraulic cylinder with a first piston and a second hydraulic cylinder with a second piston through a first pressure leading port and a second pressure leading port, and evacuating air in the first hydraulic cylinder and the second hydraulic cylinder to enable the first hydraulic cylinder and the second hydraulic cylinder to reach a working state;
2) Determining a required balance value through injection pressure in an injection scheme, namely, even if the balance value is the same as the injection pressure required in the injection scheme, calculating the value of a force G which is generated by a gravity loading part corresponding to the balance value, adjusting the size of the G in a mode of increasing or reducing the weight of a gravity loading part, and automatically adjusting the actual injection amount according to the injection pressure in the scheme after the G is adjusted;
3) When the actual injection pressure is higher than the injection pressure (namely, a balance value) in the scheme, the thrust of the hydraulic pressure in the first piston received by the pipeline is smaller than the sum of the other two forces transmitted by the rigid connection object, the stress balance is broken, the position change is generated, the first piston moves towards the control part of the oil pressure valve to drive the movement of the control part of the oil pressure valve to reduce the opening of the valve port, the injection quantity is reduced, the actual injection pressure is influenced to be reduced along with the reduction, and when the sum of the thrust of the rigid connection object received by the first piston and the gravity action of the gravity loading piece is equal to the thrust of the second piston again, namely, when the thrust of the hydraulic pressure in the first piston received by the pipeline is equal to the sum of the other two forces transmitted by the rigid connection object again, namely, the actual injection pressure is continuously reduced to be equal to the balance value again, the stress of the first piston reaches the balance state, and the opening of the valve port is not changed any more;
4) When the actual injection pressure is lower than the injection pressure (i.e. balance value) in the scheme, the thrust of the hydraulic pressure in the first piston received by the pipeline is larger than the sum of the other two forces transmitted by the rigid connection object, the stress balance is broken, the position change is generated, the first piston moves outwards of the cylinder to drive the control part of the oil pressure valve to move so as to increase the opening of the valve port, the injection quantity is increased, the actual injection pressure is further influenced, and the actual injection pressure is increased along with the increase, until the sum of the thrust of the rigid connection object received by the first piston and the gravity action of the gravity loading piece is equal to the thrust of the second piston again, namely, the thrust of the hydraulic pressure in the first piston received by the pipeline is equal to the sum of the other two forces transmitted by the rigid connection object again, namely, when the actual injection pressure continuously decreases to be equal to the balance value again, the stress of the first piston reaches the balance state, and the opening of the valve port is not changed any more;
5) The counter base numbers are sent to the receiving end at intervals through a wireless transmission technology, the receiving end gathers all injection well base number conditions in the area, and the actual injection pressure is automatically adjusted and restored to a balance value to be constant, so that the injection quantity fluctuates, and the injection condition of each well can be judged by observing the actual fluctuation of the injection quantity in each period of time; judging the reason when the actual injection quantity fluctuation exceeds the injection pressure limiting range in the scheme, if the injection scheme is changed in a test mode or the like for the abnormal injection well or the geological injection scheme is changed, changing the corresponding balance value, calculating the gravity effect quality of the gravity loading part corresponding to the new balance value again, changing the quality of the gravity loading part, and repeating the work of the step 3); if the injection well pipeline is frozen and blocked or is in a thorny state, the automatic adjustment injection is recovered after the problem is solved in time.
The beneficial effects of the invention are as follows: the system automatically adjusts injection without artificial objective interference factors, greatly improves the accuracy of injection parameters, ensures that the injection parameters are accurate according to the required moment, has small accumulated injection quantity error, and ensures that the injection quantity statistics of the oil field is more true and reliable; the system equipment can be immediately adapted to the existing site situation, the site is not required to be changed, well pattern pipelines are not required to be modified in a large scale, electricity is not required, the investment is small, the adaptation and the connection are strong, the later maintenance cost is low, and the system equipment can be realized quickly; the management mode of the existing water injection well is changed, the injection quantity is automatically regulated by the injection pressure, the injection pressure is regulated by manual daily inspection, the injection quantity is regulated by the injection pressure regulation, the injection pressure is recorded and filled out by the inspection, the manual daily work is changed into the work with extremely low requirement frequency of timely monitoring individual well conditions at a receiving end, calculating a balance value according to the requirement of an injection scheme, changing the site gravity effect, maintaining equipment and the like, the working content is radically changed, compared with the existing mode, the method saves extremely large manual labor force, saves more than 70 percent of the number of workers for inspection, greatly improves the monitoring efficiency of the well in real time, and discovers the problem more timely.
Description of the drawings:
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic diagram of a second embodiment of the present invention.
The specific embodiment is as follows:
referring to the figures, an injection system for realizing automatic adjustment of an oilfield injection well by utilizing gravity comprises a flow pipeline 1, wherein a valve port 6 is arranged at the water inlet end of the flow pipeline 1, a first hydraulic cylinder 2 and a second hydraulic cylinder 10 are sequentially arranged behind the valve port 6 in the water flow direction on the flow pipeline 1, a first piston 5 and a second piston 9 are respectively arranged in the first hydraulic cylinder 2 and the second hydraulic cylinder 10, the cross section area of the first piston 5 is different from the cross section area of the second piston 9, a first pressure leading port 3 and a second pressure leading port 11 are formed between the first piston 5 and the second piston 9 and the flow pipeline 1, the first piston 5 and the second piston 9 are connected through a rigid connection object 7, a gravity loading part 8 is arranged on the rigid connection object 7, the first piston 5 is connected with a control part 4 of an oil pressure valve, the control part 4 of the oil pressure valve is connected with the oil pressure valve, and the oil pressure valve is matched with the valve port 6. The rigid connection object 7 is a connecting rod. The rigid connection object 7 comprises a first rack 12, a second rack 13 and a gear 14, wherein the first rack 12 and the second rack 13 are respectively connected with one ends of the first piston 5 and the second piston 9, the first rack 12 and the second rack 13 are connected through the gear 14, the first rack 12 and the second rack 13 are respectively meshed with the gear 14, one side of the gear 14 is meshed with a third rack 15, one end of the third rack 15 is connected with the gravity loading piece 8, the first rack 12, the second rack 13 and the third rack 15 are meshed with the gear 14 to form consistent linkage, and the first rack 12 and the second rack 13 are meshed with the third rack 15 in a front-back staggered manner. The gravity loading part 8 adopts one of a hydraulic jack, a gear or a lever, the gravity of the gravity loading part can determine whether to amplify the force according to the site condition, and the amplification adopts one of the hydraulic jack, the gear or the lever, but the method is not limited to the amplification modes of the forces.
The method comprises the following steps:
1) The flow pipeline 1 is connected into an injection pipeline, the liquid pressure in the flow pipeline 1 is led into a first hydraulic cylinder 2 with a first piston 5 and a second hydraulic cylinder 10 with a second piston 9 through a first pressure leading port 3 and a second pressure leading port 11, and air in the first hydraulic cylinder 2 and the second hydraulic cylinder 10 is exhausted, so that the first hydraulic cylinder 2 and the second hydraulic cylinder 10 reach a working state;
2) Determining a required balance value through the injection pressure in the injection scheme, namely, even if the balance value is the same as the injection pressure required in the injection scheme, calculating the value of the force G which is generated by the gravity loading part 8 and corresponds to the balance value, adjusting the size of the G in a mode of increasing or decreasing the mass of the gravity loading part 8, and after the G adjustment is finished, automatically adjusting the actual injection amount according to the injection pressure in the scheme by a system;
3) When the actual injection pressure is higher than the injection pressure (i.e. balance value) in the scheme, the thrust of the hydraulic pressure in the first piston 5 received by the pipeline is smaller than the sum of the other two forces transmitted by the rigid connection object 7, the stress balance is broken, the position change is generated, the first piston 5 moves inwards to drive the control part 4 of the oil pressure valve to move so as to reduce the opening of the valve port 6, the injection quantity is reduced, the actual injection pressure is influenced to be reduced, until the sum of the thrust of the rigid connection object 7 received by the first piston 5 and the gravity action of the gravity loading piece 8 is equal to the thrust of the second piston 9 again, namely, the thrust of the hydraulic pressure in the pipeline received by the first piston 5 is equal to the sum of the other two forces transmitted by the rigid connection object 7 again, namely, when the actual injection pressure is continuously reduced to be equal to the balance value again, the opening of the valve port 6 is not changed any more;
4) When the actual injection pressure is lower than the injection pressure (i.e. balance value) in the scheme, the thrust of the hydraulic pressure in the first piston 5 received by the pipeline is larger than the sum of the other two forces transmitted by the rigid connection object 7, the stress balance is broken, the position change is generated, the first piston 5 moves outwards to drive the control part 4 of the oil pressure valve to move so as to increase the opening of the valve port 6, the injection quantity is increased, the actual injection pressure is further influenced to increase, until the sum of the thrust action of the rigid connection object 7 received by the first piston 5 and the gravity action of the gravity loading piece 8 is equal to the thrust action of the second piston 9 again, namely, the thrust of the hydraulic pressure in the pipeline received by the first piston 5 is equal to the sum of the other two forces transmitted by the rigid connection object 7 again, namely, when the actual injection pressure continuously decreases to be equal to the balance value again, the stress of the first piston 5 reaches the balance state, and the opening of the valve port 6 is not changed any more;
5) The counter base numbers are sent to the receiving end at intervals through a wireless transmission technology, the receiving end gathers all injection well base number conditions in the area, and the actual injection pressure is automatically adjusted and restored to a balance value to be constant, so that the injection quantity fluctuates, and the injection condition of each well can be judged by observing the actual fluctuation of the injection quantity in each period of time; judging the reason when the actual injection quantity fluctuation exceeds the injection pressure limiting range in the scheme, if the injection scheme is changed in a test mode or the like for the abnormal injection well or geology injection scheme is changed, changing the corresponding balance value, calculating the gravity effect quality of the gravity loading part 8 corresponding to the new balance value again, changing the quality of the gravity loading part 8, and repeating the work of the step 3); if the injection well pipeline is frozen and blocked or is in a thorny state, the automatic adjustment injection is recovered after the problem is solved in time.
In the above steps, the first piston 5, the second piston 9, the gravity loading part 8 and the control part 7 of the oil pressure valve are connected by the rigid coupling member 7, having uniform coupling, wherein the sectional area of the second piston 9 is larger than that of the first piston 5; when the hydraulic thrust generated by the liquid pressure in the pipeline to the second piston 9 is transmitted to the first piston 5 through the rigid connection object 7, the thrust generated to the first piston 5 is opposite to the thrust acting direction of the hydraulic pressure in the pipeline received by the first piston 5; the acting direction of the force generated by the gravity loading part 8 when the force is transmitted to the first piston 5 through the rigid connection object 7 is the same as the acting direction of the hydraulic pressure in the pipeline on the force, and the acting direction of the force generated by the gravity loading part 8 when the force is transmitted to the second piston 9 through the rigid connection object 7 is opposite to the acting direction of the hydraulic pressure in the pipeline on the force; thus, only when the first piston 5 is balanced by the thrust of the hydraulic pressure in the pipeline and the other two forces transmitted by the connecting object 7, the first piston 5 does not move any more, and the first piston 5 is connected with the control part 4 of the oil pressure valve, namely the opening degree of the valve port 6 does not change any more; the pressure value in the corresponding pipeline of the first piston 5 which is stressed and balanced is the balance value, and since the sectional area of the first piston 5 and the second piston 9 which are stressed is constant, the force generated by the gravity loading part 8 is variable, the balance value of the system can be changed by adjusting the force generated by the gravity loading part 8. The two pistons and the control part of the oil pressure valve are linked to form a whole, if the fluctuation of the actual injection pressure in the pipeline is no longer equal to the balance value, the first piston 5 is stressed unevenly to move, and the whole and the control part of the control valve are linked to drive the valve port to open and close to change, so that the flow rate is changed, and the change of the flow rate can adversely affect the liquid pressure (namely the actual injection pressure) in the pipeline until the actual injection pressure is the same as the balance value.
Example 1
Referring to fig. 1, the line pressure (injection pressure) after the oil pressure valve (i.e., flow control valve) is simultaneously induced into two cylinders, and the pressures generated in the two cylinders are respectively applied to two different sectional areas (S 1 、S 2 ，S 1 <S 2 ) On pistons of the same size, the forces generated are PS respectively 1 、PS 2 Since the in-cylinder pressures are the same, it is apparent that PS 1 <PS 2 According to the above feature, two pistons and the control portion of the oil pressure valveThe valve port 6 is driven to open and close to change due to linkage of the whole body and the control part 4 of the oil pressure valve, so that the flow is changed, and the injection pressure is influenced by the flow change; without loading the gravitational effect of the gravitational loader 8, due to PS 1 Always smaller than PS 2 The whole always moves and drives the control part 4 of the hydraulic valve to move until reaching the limit state (namely the hydraulic valve is completely closed or completely opened and closed, the closed state is structurally obtained according to the field requirement), and the gravity effect of the gravity loading part 8 is loaded (the gravity is the gravity, the force effect is constant under the condition that the weight is not changed) when the system is produced and used, and at the moment, the whole receives three forces, namely PS 1 、PS 2 And G, according to the above characteristics G and PS 1 The same effect and effect as PS 2 Action and effect of (2) with PS 1 Contrary to the effect of G, the overall force effect can be regarded as PS according to this condition 2 And PS (polystyrene) 1 In the case of the relationship between +G, only when PS 2 =PS 1 When +g, i.e. p=g/(S) 2 -S 1 ) The whole stress balance is not moved any more, namely the oil pressure valve is stable (namely the injection pressure and the flow are stable), because S 1 And S is 2 Is a fixed constant in the whole, the injection pressure and G form a logic relationship, and since the counterweight G is a constant, P=G/(S) 1 -S 2 ) The pressure P value is the balance value, only when the actual injection pressure is the same as the balance value, the whole stress is balanced, the oil pressure valve is not moved any more and is not automatically regulated, when the actual injection pressure is influenced by the change of the hydraulic pressure (pumping pressure) or the underground injection condition, the whole stress balance is destroyed, the whole is moved to drive the oil pressure valve (flow regulating valve) to regulate (namely the actual injection pressure and the flow are changed along with the change) until the actual injection pressure is regulated to be the same as the balance value P again, the flow regulation is not carried out, and the balance stable injection is reached again, therefore, the system can be used for regulating the pressure according to the timeThe condition is regulated to make the actual injection pressure value injected according to the balance value, the balance value can be changed by changing the size of G, the corresponding balance value is regulated by changing the mass balance G, so that the balance value is equal to the injection pressure required by the injection scheme, and then the system automatically controls the fluctuation of the injection quantity and automatically regulates the actual injection pressure to be equal to the injection pressure in the scheme: when the actual injection pressure is higher than the injection pressure in the scheme, the thrust on the second piston 9 is larger than the sum of the thrust on the first piston 5 and the gravity of the gravity loading piece 8, the control part 4 of the oil pressure valve is driven to move so that the opening of the valve port 6 is reduced, the injection quantity is reduced, the actual injection pressure is further reduced until the actual injection pressure is equal to the pressure in the scheme, otherwise, when the actual injection pressure is reduced, the opening of the valve port 6 is increased, the injection quantity is increased so that the pressure is increased until the pressure is equal to the scheme pressure, and thus, the pressure and the injection quantity are automatically regulated and controlled, and the automatic injection control is realized.
Referring to fig. 1, the pistons in the large and small hydraulic cylinders move in the vertical direction, and the rigid connection object 7 is a rigid rod; after the first pressure leading port 3 and the second pressure leading port 11 are positioned at the valve port 6 in the water flow direction, the pressure in the pipeline respectively enters the first hydraulic cylinder 2 and the second hydraulic cylinder 10 through the first pressure leading port 3 and the second pressure leading port 11, thrust is generated on the first piston 5 and the second piston 9, and the force born by the first piston 5 is PS 1 The second piston 9 is subjected to a force PS 2 Obvious PS 1 Less than PS 2 The method comprises the steps of carrying out a first treatment on the surface of the The two pistons are connected together through a rigid rod of the rigid connecting object 7, the first piston 5 is connected with a control part 4 of the oil pressure valve partially, so that the first piston 5, the second piston 9 and the control part 4 of the oil pressure valve are connected through the rigid rod and the like to generate consistent linkage, and the control part 4 of the oil pressure valve drives the valve port 6 to open and close; the force of gravity loading part 8 and the force of gravity G (which can be amplified by the force or moment amplifying structure and then loaded on the rigid connection object 7) are also connected to the rigid rod of the rigid connection object 7, and are linked with the first piston 5, and the direction and the characteristics of the effect of the two pistons under the thrust of the hydraulic cylinder and the gravity are the same as those described in the description of figure 1, namely PS 2 With PS 1 +G is in reverse closureThe implementation process then refers to the principles described above.
Example two
Referring to FIG. 2, the cross-sectional areas of the first piston 5 and the second piston 10 under stress are respectively S 1 And S is 2 And S is 1 Less than S 2 The meshing radius of the first rack 12 and the second rack 13 with the gear 14 is R 1 The meshing radius of the third rack 15 and the gear 14 is R 2 The third rack 15 is staggered with the first rack 12 and the second rack 13 on the front and back of the positions of the gears 14, and the acting forces generated on the first piston 5 and the second piston 10 are PS respectively 1 And PS (polystyrene) 2 And PS (polystyrene) 1 Less than PS 2 The weight of the gravity loading piece 8 is G, PS 1 、PS 2 And G are respectively transmitted to the gear 14 through racks to generate torque, when PS 2 R 1 =PS 1 R 1 +GR 2 (Note: R when G does not need to be amplified 1 =R 2 R when amplification is required 1 <R 2 In the structure diagram, R is simplified 1 =R 2 Case of time), i.e., p=gr 2 /（S 2 -S 1 ）R 1 When the whole stress is balanced, P is a balance value; the weight of the gravity loader 8 is g= (PS) 2 R 1 -PS 1 R 1 ）/R 2 After adjusting the force effect created by the gravity load member 8 by increasing or decreasing the mass of the gravity load member 8, the system begins to automatically adjust the actual injection amount according to the injection pressure in the recipe.
Referring to fig. 2, the first piston 5 and the second piston 9 in the first hydraulic cylinder 2 and the second hydraulic rod 9 move in a horizontal direction, and the rigid connection object 7 is a gear 14 and a rack; after the first pressure leading port 3 and the second pressure leading port 11 are positioned at the valve port 6 in the water flow direction, the pressure in the pipeline respectively enters the first hydraulic cylinder 2 and the second hydraulic cylinder 10 through the first pressure leading port 3 and the second pressure leading port 11, thrust is generated on the first piston 5 and the second piston 9, and the force born by the first piston 5 is PS 1 The second piston 9 is subjected to a force PS 2 Obvious PS 1 <PS 2 The method comprises the steps of carrying out a first treatment on the surface of the The first piston 5 and the second piston 9 are respectively connected with a first rack 12 and a second rack 13, the first rack 12 and the second rack 13The second rack 13 and the gear 14 are matched to generate linkage, the first piston 5 and the control part 4 of the oil pressure valve are connected together, so that the first piston 5, the second piston 9 and the control part 4 of the oil pressure valve are connected through the first rack 12, the second rack 13 and the gear 14 to generate consistent linkage, and the control part 4 of the oil pressure valve drives the valve port 6 to open and close; the gravity effect force generated by the gravity loading piece 8 is also transmitted to the gear 14 through the third rack 15 (the third rack 15 can be amplified by the moment amplifying structure according to the requirement and then loaded on the gear 14, and the third rack 15 and the connecting racks of the two pistons are staggered in the assembling position with the gear 14) and the first piston 5 are linked; from FIG. 2 it can be seen that the direction and characteristics of the effect of the thrust and gravity of the hydraulic cylinders on the two pistons are the same, namely PS 2 Torque and PS generated on gears 1 Torque generated by +G is in inverse relation, PS 2 Torque and PS generated on the gear 14 via the second rack 13 1 And when the gravity loading piece 8 reaches balance through the torque generated by the first rack 12 and the third rack 15 on the gear 14, the size of the valve port 6 is not changed any more, and the principle and the process are realized as the principle and the process are also realized.
The rigid connection member 7 used in the present system is the prior art, and is common knowledge of those skilled in the art, and this patent only refers to two specific structures, but is not limited to these two structures, and all rigid connection members capable of implementing the rigid connection function may be used, which will not be further described herein.
In summary, the injection system and the application method for realizing the automatic adjustment of the oilfield injection well by utilizing the gravity have the advantages that the manual objective interference factors are avoided in the automatic injection adjustment, the accuracy of injection parameters is greatly improved, the injection parameters are accurate according to the required moment, the accumulated injection quantity error is small, and the injection quantity statistics of the oilfield is more real and reliable; the system equipment can be immediately adapted to the existing site situation, the site is not required to be changed, well pattern pipelines are not required to be modified in a large scale, electricity is not required, the investment is small, the adaptation and the connection are strong, the later maintenance cost is low, and the system equipment can be realized quickly; the management mode of the existing water injection well is changed, the injection quantity is automatically regulated by the injection pressure, the injection pressure is regulated by manual daily inspection, the injection quantity is regulated by the injection pressure regulation, the injection pressure is recorded and filled out by the inspection, the manual daily work is changed into the work with extremely low requirement frequency of timely monitoring individual well conditions at a receiving end, calculating a balance value according to the requirement of an injection scheme, changing the site gravity effect, maintaining equipment and the like, the working content is radically changed, compared with the existing mode, the method saves extremely large manual labor force, saves more than 70 percent of the number of workers for inspection, greatly improves the monitoring efficiency of the well in real time, and discovers the problem more timely.
Claims (4)
1. An oilfield injection well injection system for achieving automatic adjustment by utilizing gravity, which is characterized in that: the hydraulic valve comprises a flow pipeline (1), wherein a valve port (6) is arranged at the water inlet end of the flow pipeline (1), a first hydraulic cylinder (2) and a second hydraulic cylinder (10) are sequentially arranged behind the valve port (6) in the water flow direction on the flow pipeline (1), a first piston (5) and a second piston (9) are respectively arranged on the first hydraulic cylinder (2) and the second hydraulic cylinder (10), the cross section area of the first piston (5) is different from the cross section area of the second piston (9), a first pressure leading port (3) and a second pressure leading port (11) are formed between the first piston (5) and the second piston (9) and the flow pipeline (1), the first piston (5) and the second piston (9) are connected through a rigid connection object (7), a gravity loading piece (8) is arranged on the rigid connection object (7), the first piston (5) is connected with a control part (4) of the oil pressure valve, and the oil pressure valve is matched with the valve port (6);
the using method based on the equipment comprises the following steps:
1) The method comprises the steps of connecting a flow pipeline (1) into an injection pipeline, leading the liquid pressure in the flow pipeline (1) into a first hydraulic cylinder (2) with a first piston (5) and a second hydraulic cylinder (10) with a second piston (9) through a first pressure leading port (3) and a second pressure leading port (11), and exhausting air in the first hydraulic cylinder (2) and the second hydraulic cylinder (10) to enable the first hydraulic cylinder (2) and the second hydraulic cylinder (10) to reach a working state;
2) Determining a required balance value through injection pressure in an injection scheme, namely, even if the balance value is the same as the injection pressure required in the injection scheme, calculating the value of force G which is generated by a gravity loading part (8) corresponding to the balance value, adjusting the size of G in a mode of increasing or reducing the mass of the gravity loading part (8), and automatically adjusting the actual injection quantity according to the injection pressure in the scheme after the G adjustment is finished;
3) When the actual injection pressure is higher than the injection pressure (namely the balance value) in the scheme, the thrust of the hydraulic pressure in the first piston (5) received by the pipeline is smaller than the sum of the other two forces transmitted by the rigid connection object (7), the stress balance is broken, the position change is generated, the first piston (5) moves inwards to drive the valve control part (4) to move so as to reduce the opening of the valve port (6), the injection quantity is reduced, the actual injection pressure is influenced to be reduced, and the actual injection pressure is influenced to be reduced until the sum of the thrust of the rigid connection object (7) received by the first piston (5) and the gravity action of the gravity loading piece (8) is equal to the thrust of the second piston (9) again, namely the thrust of the hydraulic pressure in the pipeline is equal to the sum of the other two forces transmitted by the rigid connection object (7) again, namely the actual injection pressure is continuously reduced to be equal to the balance value again, the opening of the valve port (6) is not changed any more;
4) When the actual injection pressure is lower than the injection pressure (namely a balance value) in the scheme, the thrust of the hydraulic pressure in the first piston (5) received by the pipeline is larger than the sum of the other two forces transmitted by the rigid connection object (7), the stress balance is broken, the position change is generated, the first piston (5) moves outwards to drive the valve control part (4) to move so as to increase the opening of the valve port (6), the injection quantity is increased, the actual injection pressure is further influenced to increase, and the opening of the valve port (6) is not changed any more until the sum of the thrust of the rigid connection object (7) received by the first piston (5) and the gravity action of the gravity loading piece (8) is again equal to the thrust of the second piston (9), namely the thrust of the hydraulic pressure in the pipeline is again equal to the sum of the other two forces transmitted by the rigid connection object (7), namely the actual injection pressure is continuously reduced to be equal to the balance value again;
5) The counter base numbers are sent to the receiving end at intervals through a wireless transmission technology, the receiving end gathers all injection well base number conditions in the area, and the actual injection pressure is automatically adjusted and restored to a balance value to be constant, so that the injection quantity fluctuates, and the injection condition of each well can be judged by observing the actual fluctuation of the injection quantity in each period of time; judging the reason when the actual injection quantity fluctuation exceeds the injection pressure limiting range in the scheme, if the injection scheme is changed in a test mode or the like for the abnormal injection well or geology injection scheme is changed, changing the corresponding balance value, calculating the gravity effect quality of the gravity loading part (8) corresponding to the new balance value again, changing the quality of the gravity loading part (8), and repeating the work of the step 3); if the injection well pipeline is frozen and blocked or is in a thorny state, the automatic adjustment injection is recovered after the problem is solved in time.
2. An oilfield injection well injection system for achieving self-tuning using gravity as defined in claim 1, wherein: the rigid connection object (7) is a connecting rod.
3. An oilfield injection well injection system for achieving self-tuning using gravity as defined in claim 1, wherein: the rigid connection object (7) comprises a first rack (12), a second rack (13) and a gear (14), wherein the first rack (12) and the second rack (13) are respectively connected with one ends of the first piston (5) and the second piston (9), the first rack (12) and the second rack (13) are connected and combined and linked through the gear (14), the first rack (12) and the second rack (13) are respectively meshed with the gear (14), one side of the gear (14) is meshed with a third rack (15), one end of the third rack (15) is connected with the gravity loading piece (8), the first rack (12), the second rack (13) and the third rack (15) are meshed with the gear (14) to form consistent linkage, and the first rack (12) and the second rack (13) are meshed with the third rack (15) in a front-back staggered mode.
4. An oilfield injection well injection system for achieving self-tuning using gravity as defined in claim 1, wherein: the gravity loading piece (8) adopts one of a hydraulic jack, a gear or a lever.
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| RU2160860C1 (en) * | 2000-04-25 | 2000-12-20 | Андреев Александр Павлович | Valve |
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| JP2015098910A (en) * | 2013-11-19 | 2015-05-28 | 麓技研株式会社 | Emergency cut-off device |
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| CN109357068A (en) * | 2018-11-30 | 2019-02-19 | 中国船舶重工集团公司第七〇九研究所 | Valve actuator and its application method |
| CN209539337U (en) * | 2019-02-25 | 2019-10-25 | 江炎芬 | The injected system of oil field injection well automatic adjustment is realized using gravity |
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2019
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| RU2160860C1 (en) * | 2000-04-25 | 2000-12-20 | Андреев Александр Павлович | Valve |
| CN202834320U (en) * | 2012-10-21 | 2013-03-27 | 上海恳工自动化设备有限公司 | Counterweight automatic pressure-maintaining pilot executive device |
| JP2015098910A (en) * | 2013-11-19 | 2015-05-28 | 麓技研株式会社 | Emergency cut-off device |
| CN105370903A (en) * | 2015-11-19 | 2016-03-02 | 重庆瑞霆塑胶有限公司 | One-way valve used for injecting device |
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