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CN-117328845-B - Filling device and method for biological enzyme pour point depressant at bottom of well

CN117328845BCN 117328845 BCN117328845 BCN 117328845BCN-117328845-B

Abstract

The invention relates to a well bottom biological enzyme pour point depressant filling device which comprises a wellhead device, a filling device, a driving aid supply assembly, a stirring device, a plurality of hoses and a stirring body, wherein the filling device is arranged in a sleeve of an injection well and is positioned at a well bottom reservoir and used for receiving driving aid from the wellhead device and injecting the driving aid into the reservoir, the driving aid supply assembly is communicated with the wellhead device, the storage tank comprises an outer tank body and an inner tank body which are sleeved inside and outside, a rotatable stirring shaft is further arranged inside the inner tank body, the stirring device is fixedly arranged at the upper end of the stirring shaft and is positioned inside the inner tank body, a water jacket is arranged around the outer side of the inner tank body and positioned in a space between the outer tank body and the inner tank body, an electromagnetic induction heating coil is arranged inside the filling device, the stirring device comprises a stirring disc fixedly arranged at the upper end of the stirring shaft, the hoses are arranged outside the lower end face of the stirring disc and are arranged in a circumferential array, the stirring bodies are fixedly arranged on the hoses, and the stirring bodies are arranged in a vertical array.

Inventors

  • WANG YONGZHONG

Assignees

  • 天津圣君宇生物技术集团有限公司

Dates

Publication Date
20260505
Application Date
20231009

Claims (7)

  1. 1. A downhole bio-enzyme pour point depressant filling device comprising: the wellhead device is arranged at the wellhead of the injection well and is used for injecting a driving agent into the injection well; the injection device is arranged in the injection well casing, is positioned at a reservoir at the bottom of the well and is used for receiving the driving aid from the wellhead device and injecting the driving aid into the reservoir; the auxiliary driving agent supply assembly is used for containing auxiliary driving agent in the storage tank, the inlet end of the storage tank is communicated with the auxiliary driving agent supply device, and the outlet end of the storage tank is communicated with the wellhead device; the storage tank comprises an outer tank body and an inner tank body which are sleeved inside and outside, the driving aid is contained in the inner tank body, a rotatable stirring shaft is further installed in the inner tank body, the upper end of the stirring shaft extends out through the tank body cover and is in transmission connection with a servo motor installed on the tank body cover; The auxiliary driving agent supply assembly further comprises a stirring device which is fixedly arranged at the upper end of the stirring shaft and is positioned in the inner tank body; the filling device is characterized in that a water jacket is arranged on the outer side of the inner tank body in a surrounding manner, and the water jacket is positioned in a space between the outer tank body and the inner tank body; and, the stirring device includes: The stirring disc is fixedly arranged at the upper end of the stirring shaft; the hoses are arranged outside the lower end face of the stirring disc and are arranged in a circumferential array; The stirring bodies are fixedly arranged on the hose and are arranged in a vertical array; The filling device comprises: The upper end of the mandrel pipe is communicated with the wellhead device, a first water outlet is formed in the mandrel pipe, a temperature sensor is further arranged on the inner wall of the mandrel pipe, and the temperature sensor is positioned at the upper edge of the electromagnetic induction heating coil; The middle cylinder is coaxially and fixedly sleeved outside the mandrel pipe, a second water outlet is arranged, and the first water outlet is communicated with the second water outlet and is positioned at the same height; The hydraulic cylinder is coaxially and fixedly sleeved outside the middle cylinder, an installation space is formed between the inner wall of the hydraulic cylinder and the outer wall of the middle cylinder, a closed partition ring is fixedly arranged in the installation space, the lower end of the closed partition ring is level with the upper opening of the second water outlet, and the electromagnetic induction heating coil is arranged at the upper end of the closed partition ring; the hydraulic cylinder is also provided with a plurality of vertical passages communicated with the second water outlet in a circumferential array, and the upper ends of the vertical passages are level with the lower opening of the second water outlet; the side wall of the hydraulic cylinder is also provided with a driving aid outlet communicated with the vertical passage; A flow valve is arranged in the vertical passage, the second water outlet is communicated with a driving aid inlet end of the flow valve, the flow valve also comprises a driving aid discharge end, and the driving aid discharge end is communicated with a driving aid outlet; The stirring disc is internally provided with a first annular accommodating cavity and a second annular accommodating cavity for respectively accommodating acidic liquid medicine and alkaline liquid medicine; the stirring disc is internally provided with a first annular supply cavity and a second annular supply cavity, the first annular supply cavity and the second annular supply cavity are respectively communicated with the first annular accommodating cavity and the second annular accommodating cavity, and the positions of the annular supply cavities correspond to the positions of the hoses; the hose comprises a first hose and a second hose, the first hose and the second hose are respectively communicated with the first annular replenishing cavity and the second annular replenishing cavity, and the first hose and the second hose are arranged at intervals; The outer side of the stirring body is provided with liquid medicine nozzles, the outer side of the hose is provided with liquid medicine outlets the same as the stirring body in number, and the liquid medicine outlets are communicated with the liquid medicine nozzles; the side of the outer tank body is also provided with a ph value detecting element, and a detecting head of the ph value detecting element stretches into the inner tank body.
  2. 2. The downhole bio-enzyme pour point depressant filling apparatus of claim 1, wherein the flow valve comprises: The inner valve body is in a tubular shape, is provided with an inlet and an outlet, and is provided with an auxiliary driving agent flow channel extending between the inlet and the outlet; The outer valve body is tubular, is fixedly sleeved on the outer side of the inner valve body, is internally provided with an annular flange in an extending mode, and the upper end face of the inner valve body abuts against the lower end face of the annular flange; The valve core is slidably arranged in the inner valve body and is provided with an annular shoulder, and the annular shoulder is provided with a first surface matched with the first acting surface of the annular flange and a second surface matched with the second acting surface of the inner valve body; The compression spring is arranged in the inner valve body and sleeved on the outer side of the valve core, the lower end of the compression spring is connected with the inner valve body, and the upper end of the compression spring is connected with the lower end face of the annular shoulder; Wherein a first path having a first variable volume is formed between the first surface and the first active surface, a second path having a second variable volume is formed between the second surface and the second active surface, and the first variable volume and the second variable volume are equal at a prescribed threshold inlet pressure.
  3. 3. The downhole bio-enzyme pour point depressant filling device of claim 2, wherein the first surface and the second surface of the annular shoulder are both in an inclined configuration and the first active surface of the annular flange and the second active surface of the inner valve body are both in an inclined configuration and the angle of inclination is the same as the first surface and the second surface, respectively.
  4. 4. The filling device of the bottom hole biological enzyme pour point depressant according to claim 2, wherein a vertical annular groove is formed on one side of the second surface of the annular shoulder, and a slidable adjusting ring is arranged in the annular groove; the upper end of the valve core is also provided with an installation cavity, and the side wall of the installation cavity is provided with a plurality of penetrating grooves which are arranged in an array and communicated with the annular grooves; The adjusting ring comprises a guide driving disc, a plurality of connecting rods which are arranged on the side wall of the guide driving disc and are arranged in an array, an adjusting ring body which is arranged on the periphery side of the guide driving disc, and one end of each connecting rod, which is far away from the guide driving disc, is arranged on the inner side wall of the adjusting ring body; The adjusting ring body is slidably arranged in the annular groove, the guide driving disc is slidably arranged in the mounting cavity, and the connecting rod penetrates through the through groove to be connected with the adjusting ring body and the guide driving disc respectively; the adjusting ring body is provided with an adjusting surface matched with the second surface of the annular shoulder, and the adjusting surface and the second acting surface of the inner valve body form a second path; an actuator capable of driving the guide driving disc to lift is further arranged in the mounting cavity.
  5. 5. The filling device of the bottom hole biological enzyme pour point depressant according to claim 1, wherein the lower end of the first supplementing ring cavity is further provided with liquid medicine passing pipes, the quantity of which is the same as that of the first hoses, and the liquid medicine passing pipes pass through the lower openings of the second supplementing ring cavity to be communicated with the inlets of the first hoses, and the positions of the liquid medicine passing pipes correspond to the positions of the first hoses; The outer peripheral array of the first annular accommodating cavity is provided with first liquid medicine passages with the same number as the first hoses, and the first liquid medicine passages are communicated with the first supplementing annular cavity; the outer peripheral array of the second annular accommodating cavity is provided with second liquid medicine passages with the same number as the second hoses, and the second liquid medicine passages are communicated with the second supply annular cavity.
  6. 6. The filling device of the biological enzyme pour point depressant at the bottom of the well according to claim 1, wherein the outer side of the lower end surface of the stirring disc is provided with hose installation cavities with the same number as that of the hoses, the hoses are installed in the hose installation cavities, and the hose installation cavities are respectively communicated with the liquid medicine through pipes and the second supply annular cavity; The upper end face of the hose is arranged in the hose installation cavity, and a flange plate is installed on the upper end face of the hose; the outer side of the first hose is sleeved with a first spring, the outer side of the second hose is sleeved with a second spring, and the elastic coefficient of the first spring is smaller than that of the second spring; A first blocking ring and a second blocking ring are respectively and fixedly arranged in the hose installation cavity and above the flange plate, the first blocking ring is positioned above the second blocking ring, and a first gate and a second gate are respectively arranged at the centers of the first blocking ring and the second blocking ring; The upper end of ring flange still installs the flashboard through connection structure, and the flashboard is located first gate.
  7. 7. A method for filling a bottom hole bio-enzyme pour point depressant, which uses the bottom hole bio-enzyme pour point depressant filling device according to any one of claims 1 to 6, and is characterized by comprising the following steps: S1, communicating an inlet end of a storage tank with a driving-aid replenishing device, communicating an outlet end of the storage tank with a driving-aid inlet of a wellhead device, starting a servo motor, and stirring driving-aid in an inner tank body; S2, starting the water jacket to heat the inner tank body, and heating the auxiliary agent in the inner tank body to a temperature higher than an ideal temperature value of the auxiliary agent, but not exceeding the deactivation temperature of the biological enzyme; s3, simultaneously, powering on the electromagnetic induction heating coil, preheating the filling device for a period of time, and powering off; S4, starting an injection pump, injecting a driving aid into a core shaft tube of the filling device, enabling the driving aid to flow through a first water outlet, a second water outlet, a flow valve in a vertical passage and a driving aid outlet in sequence, and entering a well bottom reservoir; s5, detecting a temperature value of the auxiliary driving agent in the core-shaft tube by the temperature sensor, and judging whether the electromagnetic induction heating coil needs to be started to heat the auxiliary driving agent in the core-shaft tube according to the detected temperature value.

Description

Filling device and method for biological enzyme pour point depressant at bottom of well Technical Field The invention belongs to the technical field of bio-enzyme assisted flooding oil extraction, and particularly relates to a device and a method for filling a well bottom bio-enzyme pour point depressant. Background In the water-driven biological enzyme pour point depressing and viscosity reducing agent filling technology, the driving aid is water mixed with the biological enzyme pour point depressing and viscosity reducing agent, compared with a chemical driving method for improving the recovery ratio, the biological enzyme oil displacement technology has been rapidly developed in recent years, and the technology also successfully improves the petroleum recovery ratio in oil reservoirs of high pour point oil and heavy oil blocks around the world. The temperature of the driving agent, the injection speed of the driving agent, the uniformity of mixing of the driving agent and the ph value of the driving agent all have influences on the pour point depressing effect of the biological enzyme driving agent, and the biological enzyme driving agent is always expected to be injected into a well bottom reservoir at a specified temperature, injection speed and ph value in engineering practice. However, the conventional filling device for the biological enzyme pour point depressant at the bottom of the well is dependent on the control of the temperature and the injection speed of the auxiliary agent on the ground, and lacks necessary underground control means, so that the temperature and the injection speed of the auxiliary agent at the outlet side of the injection device deviate from the specified values too much, and the oil displacement effect is affected. In addition, in the traditional filling device, a stirring device arranged in a driving-aid storage tank drives a stirring rod and stirring blades to rotate through a stirring shaft so as to quickly and uniformly mix biological enzyme and water, but for a large storage tank, the stirring blades arranged in a discrete manner in the vertical direction cannot sufficiently uniformly mix the driving-aid in the whole tank. Therefore, there is a need for a downhole bio-enzyme pour point depressant filling apparatus and method that addresses the above-described issues. Disclosure of Invention In order to solve the above problems, in one aspect, the present invention provides a downhole bio-enzyme pour point depressant filling device, comprising: the wellhead device is arranged at the wellhead of the injection well and is used for injecting a driving agent into the injection well; the injection device is arranged in the injection well casing, is positioned at a reservoir at the bottom of the well and is used for receiving the driving aid from the wellhead device and injecting the driving aid into the reservoir; the auxiliary driving agent supply assembly is used for containing auxiliary driving agent in the storage tank, the inlet end of the storage tank is communicated with the auxiliary driving agent supply device, and the outlet end of the storage tank is communicated with the wellhead device; the storage tank comprises an outer tank body and an inner tank body which are sleeved inside and outside, the driving aid is contained in the inner tank body, a rotatable stirring shaft is further installed in the inner tank body, the upper end of the stirring shaft extends out through the tank body cover and is in transmission connection with a servo motor installed on the tank body cover; The auxiliary driving agent supply assembly further comprises a stirring device which is fixedly arranged at the upper end of the stirring shaft and is positioned in the inner tank body; the water jacket is arranged around the outer side of the inner tank body and is positioned in the space between the outer tank body and the inner tank body; and, the stirring device includes: The stirring disc is fixedly arranged at the upper end of the stirring shaft; the hoses are arranged outside the lower end face of the stirring disc and are arranged in a circumferential array; The stirring bodies are fixedly arranged on the hose and are arranged in a vertical array. On the other hand, the invention provides a filling method of a bottom biological enzyme pour point depressant, which uses the bottom biological enzyme pour point depressant filling device and comprises the following steps: S1, communicating an inlet end of a storage tank with a driving-aid replenishing device, communicating an outlet end of the storage tank with a driving-aid inlet of a wellhead device, starting a servo motor, and stirring driving-aid in an inner tank body; S2, starting the water jacket to heat the inner tank body, and heating the auxiliary agent in the inner tank body to a temperature higher than an ideal temperature value of the auxiliary agent, but not exceeding the deactivation temperature of the biological enzyme; s3,