CN109078900B - Well cementation car pipeline cleaning process - Google Patents

Abstract

A well cementation car pipeline cleaning process that involves oil drilling and production well workover equipment includes: a primary washing stage, a primary circulating washing stage, a secondary circulating washing stage, a third circulating washing stage and pollution discharge. According to the invention, by switching the pipeline valve, high-pressure water pumped out by the centrifugal pump is utilized to realize pipeline sectional cleaning and large-discharge flushing of the densimeter, the mixer and the like, and the problems of large water consumption for cleaning, low cleaning efficiency, incomplete cleaning of the densimeter and the like are solved.

Description

Well cementation car pipeline cleaning process

Technical Field

The invention relates to the field of petroleum drilling and production well repairing equipment, in particular to a cleaning process for a well cementation vehicle pipeline.

Background

The well cementation engineering is a century-old majority of oil fields, and the quality of well cementation is related to the development and construction of the oil fields, and is a basic engineering for long-term stable production of the oil fields. Through going up the investigation to each large oil field equipment use side, synthesize present domestic environmental protection requirement and the on-the-spot washing water condition, carry out the analysis to current washing flow, summarize current flow existing problem as follows:

(1) the cleaning process of the equipment is not clear, the cleaning processes of various well cementation teams have certain difference, and redundant and inefficient processes generally exist in the cleaning process.

(2) Lack high-efficient reliable densimeter cleaning procedure, the back densimeter that washs finishes in cement caking, the residue remains the scheduling problem occasionally to exist, influences densimeter life and performance.

(3) Because of the increasing strictness of environmental protection laws and regulations, the water consumption for cleaning the well cementation equipment on site is less and less, and the difficulty of cleaning the equipment is increased.

Disclosure of Invention

The invention aims to: the method comprises the steps of cleaning the pipeline in sections, flushing the densimeter at a large discharge capacity and the like, and solves the problems of large water consumption for cleaning, low cleaning efficiency, incomplete cleaning of the densimeter and the mixer and the like.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a well cementation car pipeline cleaning process is characterized in that: the method comprises the following steps: a primary washing stage, a primary circulating washing stage, a secondary circulating washing stage, a third circulating washing stage and pollution discharge;

the initial washing stage: the primary cleaning is performed using clean water for a densimeter, a mixer, a flowmeter, a jet pump, a circulation pump, and the like. The cement slurry which is agglomerated in pipelines and key parts is completely brought into a slurry mixing tank by high-flow-rate clean water with pressure generated by a centrifugal pump;

a primary circulation cleaning stage: the densitometer and the mixer are primarily cleaned. By properly switching the valve switch of the pipeline and starting the circulating pump, the water filled into the slurry mixing tank in the initial washing stage is used for repeatedly and circularly washing the densimeter and the mixer. When the color of the cleaning water is kept stable and the impurities in the water are not increased obviously, the valve is properly switched, and the plunger pump is started to discharge the waste liquid;

and (3) secondary circulation cleaning stage: and (4) forming a closed circulation pipeline by using the slurry mixing tank, the circulating pump and the densimeter, and cleaning the densimeter and the slurry mixing tank again. Firstly, opening a circulating pump to pressurize clear water in a metering tank and pump the clear water into a slurry mixing tank through a densimeter and a mixer by properly switching a pipeline valve switch, and starting the circulating pump to enable the water in the slurry mixing tank to circularly clean the densimeter and the mixer by properly switching the pipeline valve switch when a certain amount of water exists in the slurry mixing tank, wherein the aim of the stage is to ensure that no large dirt particles are left in the densimeter and the mixer;

and (3) three-time circulating cleaning stage: the densimeter and the mixer are cleaned with unused clear water in large discharge amount to ensure no residual cement slurry inside. Firstly, opening a circulating pump by properly switching a pipeline valve switch to circularly clean the densimeter by clean water in a metering tank, wherein the aim of the stage is to ensure that no cleaned sewage is remained in the densimeter; secondly, by properly switching a pipeline valve switch, starting a circulating pump, cleaning the mixer for the last time by pressurizing the circulating pump by using clean water in a metering tank, and discharging waste water into a slurry mixing tank; the purpose of this stage is to ensure that no cleaned effluent remains in the mixer;

and (3) blowdown: and (4) completely closing the pipeline valves of the equipment, injecting sewage into the plunger pump through the circulating pump and the filling pump, and finally pumping the sewage out through the plunger pump to finish the final cleaning step.

The invention has the beneficial effects that: manifold washs the flow, has solved the current problem that the cleaning process in the effect is not good, the washing needs the great water yield, has formulated the multistage washing scheme to the parts of easily remaining grout such as densimeter, blender, has ensured densimeter, blender cleaning performance.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

Detailed Description

The principles and features of this invention are explained in the following description, taken in conjunction with the accompanying drawings, which are set forth by way of illustration, and not by way of limitation.

Initial washing stage

As shown in figure 1: at this stage, the densitometer 5, the mixer 6, the flow meter 4, the jet pump 9, the circulation pump 10, and the like are primarily cleaned with clean water. A water supply valve at the bottom of the metering tank 8 is opened, and the unused clean water in the metering tank 8 is pressurized by a jet pump 9 and a circulating pump 10 and passes through pipelines of the metering tank 8, the circulating pump 10, the densimeter 5 and the slurry mixing tank 7, namely a sealed meter pipeline; a metering tank 8-a circulating pump 10-an injection pump 9-a mixer 6-a slurry mixing tank 7 pipeline, namely a mixer pipeline; the metering tank 8-the circulating pump 10-the flowmeter 4-the slurry mixing tank 7 pipeline is the flowmeter pipeline, discharges into the slurry mixing tank 7, and the valve at the bottom of the slurry mixing tank 7 is closed at this moment, and the circulating pump 10 and the jet pump 9 produce the high velocity of flow clear water under pressure, bring the cement paste that has not caked in the pipeline and key spare part into the slurry mixing tank 7 completely, finish the initial cleaning operation.

One cycle cleaning phase

In this stage, the densimeter 5 and the mixer 6 are primarily cleaned, and the specific steps are as follows:

closing other valves of the pipeline, opening all valves of the pipeline of the slurry mixing tank 7-the circulating pump 10-the densimeter 5-the slurry mixing tank 7 and the pipeline of the slurry mixing tank 7-the mixer 6-the slurry mixing tank 7, and starting the circulating pump 10 to repeatedly and circularly flush the densimeter 5 and the mixer 6 by using water filled into the slurry mixing tank 7 in the initial washing stage;

observing the cleaning water condition in the slurry mixing tank 7, when the color of the cleaning water is kept stable and the impurities in the water are not increased obviously, closing the circulating pump 10-densimeter 5-slurry mixing tank 7 pipeline and the circulating pump 10-mixer 6-slurry mixing tank 7 pipeline, opening the slurry mixing tank 7-circulating pump 10-plunger pump pipeline and the slurry mixing tank 7-filling pump 11-plunger pump 14 pipeline, discharging the waste liquid, finishing the primary circulation stage,

secondary circulation cleaning stage

At this stage, the slurry mixing tank, the circulating pump and the densimeter form a closed circulating pipeline, and the densimeter and the slurry mixing tank are cleaned again, and the method comprises the following specific steps:

opening valves of a metering tank 7-a circulating pump 10-a densimeter 5-a slurry mixing tank pipeline and a metering tank 8-a circulating pump 10-a mixer 6-a slurry mixing tank 7 pipeline, and closing all the other pipelines and valves, wherein unused clean water is filled in the metering tank 8; the circulating pump 10 is opened to pressurize the clean water in the metering tank 7 and pump the water into the slurry mixing tank 7 through the densimeter, at the moment, the densimeter 5 and the mixer 6 are washed by the clean water,

when a certain amount of water is stored in the slurry mixing tank 7, a pipeline valve of the metering tank 8-the circulating pump 10 is closed, a pipeline valve of the slurry mixing tank 7-the circulating pump is opened, the circulating pump 10 is opened to pressurize clean water in the slurry mixing tank 7 and pump the clean water into the slurry mixing tank 7 through the densimeter 5 and the mixer 6, the densimeter 5 is circularly flushed,

observing the cleaning water condition in the slurry mixing tank 7, closing a pipeline valve of the densimeter 5-slurry mixing tank 7 when the color of the cleaning water is kept stable and impurities in water are not obviously increased, opening a pipeline valve of the metering tank 8-the circulating pump 10-the densimeter 5-the metering tank 8, and performing a clear water circulating cleaning process on the densimeter 5 through the circulating pump 10 by using clear water in the metering tank 8; the purpose of this stage is to ensure that no washed effluent remains in the densitometer 5,

three-cycle cleaning stage

At this stage, the densimeter 5 and the mixer 6 are intensively cleaned with unused clean water with large discharge capacity to ensure that no cement slurry remains in the densimeter, and the method comprises the following specific steps:

closing a pipeline valve of the densimeter 5-the metering tank 8, opening a pipeline valve of the metering tank 8-the circulating pump 10-the mixer 6-the slurry mixing tank 7, using clean water in the metering tank 8, pressurizing through the circulating pump 10 to carry out the last cleaning on the mixer 6, and discharging wastewater into the slurry mixing tank; the purpose of this stage is to ensure that no cleaned effluent remains in the mixer.

Opening pipeline valves of the slurry mixing tank 7-the circulating pump 10-the plunger pump 12 and the slurry mixing tank 7-the filling pump 11-the plunger pump 12, closing all the other pipeline valves of the equipment, injecting sewage into the plunger pump 12 through the circulating pump 10 and the filling pump 11, and finally pumping out the sewage through the plunger pump to finish the final cleaning step.

Claims (1)

1. A well cementation car pipeline cleaning process is characterized in that: the method comprises the following steps: a primary washing stage, a primary circulating washing stage, a secondary circulating washing stage, a third circulating washing stage and pollution discharge;

the initial washing stage: carrying out primary cleaning on the densimeter, the mixer, the flowmeter, the jet pump and the circulating pump by using clean water; the cement slurry which is agglomerated in pipelines and key parts is completely brought into a slurry mixing tank by high-flow-rate clean water with pressure generated by a centrifugal pump;

a primary circulation cleaning stage: primarily cleaning a densimeter and a mixer; by properly switching the valve switch of the pipeline and starting the circulating pump, the water filled into the slurry mixing tank in the initial washing stage is used for repeatedly and circularly washing the densimeter and the mixer; when the color of the cleaning water is kept stable and the impurities in the water are not increased obviously, the valve is properly switched, and the plunger pump is started to discharge the waste liquid;

and (3) secondary circulation cleaning stage: forming a closed circulation pipeline by using the slurry mixing tank, the circulating pump and the densimeter, and cleaning the densimeter and the slurry mixing tank again; firstly, opening a circulating pump by properly reversing a pipeline valve switch, pumping clean water in a metering tank into a slurry mixing tank by a densimeter and a mixer, and when a certain amount of water exists in the slurry mixing tank, starting the circulating pump by properly reversing the pipeline valve switch to ensure that no large dirt particles are left in the densimeter and the mixer;

and (3) three-time circulating cleaning stage: the densimeter and the mixer are mainly cleaned with unused clean water at a large discharge capacity, so that no cement slurry residue is left in the densimeter and the mixer; firstly, opening a circulating pump by properly switching a pipeline valve switch to circularly clean the densimeter by clean water in a metering tank, wherein the aim of the stage is to ensure that no cleaned sewage is remained in the densimeter; secondly, by properly switching a pipeline valve switch, starting a circulating pump, cleaning the mixer for the last time by pressurizing the circulating pump by using clean water in a metering tank, and discharging waste water into a slurry mixing tank; the purpose of this stage is to ensure that no cleaned effluent remains in the mixer;

and (3) blowdown: and (4) completely closing the pipeline valves of the equipment, injecting sewage into the plunger pump through the circulating pump and the filling pump, and finally pumping the sewage out through the plunger pump to finish the final cleaning step.

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