CN112746828A - Sand prevention construction process - Google Patents
Sand prevention construction process Download PDFInfo
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- CN112746828A CN112746828A CN201911036754.1A CN201911036754A CN112746828A CN 112746828 A CN112746828 A CN 112746828A CN 201911036754 A CN201911036754 A CN 201911036754A CN 112746828 A CN112746828 A CN 112746828A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
Abstract
The application discloses a sand prevention construction process, and belongs to the technical field of petroleum engineering. The sand control construction technology that this application embodiment provided, the water absorption capacity of the preceding survey first position and second position obtains first volume and second volume respectively, then carries out the pressure testing to sleeve pipe and oil pipe, after the pressure testing is qualified, from oil pipe to the second position pump in the sand-carrying liquid of second volume to and from the sleeve pipe to the make-up fluid of first volume of first position pump in, first position is located the top of second position. The supplementing liquid can supplement the pressure of the first layer lost above the second layer, and the rest supplementing liquid goes down to prevent the sand-carrying liquid pumped in from the oil pipe from going upwards, so that the first precoated sand and the second precoated sand in the sand-carrying liquid from going upwards along with the sand-carrying liquid are prevented from going upwards, the sand prevention pipe column is prevented from being locked, the oil pipe is not easy to pull out, and the sand prevention effect is improved.
Description
Technical Field
The application relates to the technical field of petroleum engineering. In particular to a sand prevention construction process.
Background
During the oil exploitation process, the sand production phenomenon often occurs in oil-water wells. The problems of non-function of an oil well pump, sand burying of an oil layer and the like are easily caused by sand production, and the bottom layer collapses to cause deformation of the sleeve pipe, so that the oil pipe is scrapped, and the production of an oil-water well is stopped. Therefore, when the sand production phenomenon occurs in the oil-water well, sand control measures need to be taken.
In the related art, a sand control string including an oil pipe and other components is put in a sand control construction. Pumping the sand carrying liquid from the oil pipe, wherein the sand carrying liquid carries the precoated sand. Under the action of the temperature of the stratum, the precoated sand is solidified to form a sand prevention layer, and the sand in the stratum is prevented from being exploited out along with the petroleum by the sand prevention layer.
However, in the related art, the coated sand in the sand-carrying fluid pumped from the oil pipe may return upwards along with the sand-carrying fluid, and the returned coated sand may lock the sand control pipe column during consolidation, so that the oil pipe is not easy to pull out, and the sand control effect is poor.
Disclosure of Invention
The embodiment of the application provides a sand control construction process, can avoid the sand control tubular column to be locked, improves the sand control effect. The specific technical scheme is as follows:
the embodiment of the application provides a sand control construction process, the process comprises:
measuring the water absorption of a first layer of a target well to obtain a first volume, and measuring the water absorption of a second layer of the target well to obtain a second volume, wherein the first layer is a layer which does not need sand control construction in the target well, the second layer is a layer which needs sand control construction in the target well, and the first layer is positioned above the second layer;
the method comprises the following steps of putting an oil pipe into a casing arranged in a target well, putting the oil pipe down to a preset distance away from the layer top of a second layer of the target well, carrying out pressure test on the casing and the oil pipe, pumping the sand-carrying liquid with the second volume from the oil pipe to the second layer and pumping the supplementary liquid with the first volume from the casing to the first layer after the pressure test is qualified, wherein the supplementary liquid is used for preventing the sand-carrying liquid from returning upwards, and comprises the following steps: first clear water, first tectorial membrane sand and second tectorial membrane sand, first tectorial membrane sand includes: the coating resin is coated on the surface of the raw material sand; the second precoated sand includes: the raw material sand and the curing agent are coated on the surface of the raw material sand;
after the sand-carrying fluid is pumped in, pumping a third volume of displacement fluid from the oil pipe to the second layer;
and closing the gate of the oil pipe and the gate of the casing, waiting for the first precoated sand and the second precoated sand to be cemented and cured, and lowering the oil pipe to the bottom of the target well when the first preset time length is reached, wherein the bottom of the well is positioned below the second position.
In one possible implementation, the coating resin is a modified epoxy resin;
the curing agent is an epoxy resin curing agent.
In another possible implementation manner, the first precoated sand and the second precoated sand in the sand-carrying fluid account for not more than 15% of the first clear water.
In another possible implementation manner, the first precoated sand and/or the second precoated sand further include: at least one of a plasticizer, carboxymethyl cellulose, and an accelerator.
In another possible implementation, the plasticizer is at least one of dibutyl phthalate, dimethyl phthalate, and silane.
In another possible implementation, the accelerator is calcium stearate.
In another possible implementation, before pumping the second volume of the sand-laden fluid from the tubing to the second formation and pumping the first volume of the make-up fluid from the casing to the first formation, the process further includes:
injecting second clean water from the oil pipe, washing the well in a positive circulation mode until the second clean water returns from the casing, and closing a gate of the casing;
and injecting third clean water from the oil pipe, and when the pressure of the oil pipe is lower than a first preset threshold value and the discharge capacity of the third clean water is larger than a second preset threshold value, performing the steps of pumping the second volume of the sand-carrying liquid from the oil pipe to the second layer and pumping the first volume of the replenishing liquid from the casing pipe to the first layer.
In another possible implementation, the pumping the second volume of sand-laden fluid from the tubing to the second formation includes:
pumping the second volume of sand-laden fluid from the tubing to the second formation via a first pumping apparatus;
wherein the first pumping apparatus comprises: the system comprises a first liquid storage tank, a first pump truck, a first sand mixing truck and a first sand storage truck;
the first liquid storage tank is connected with one end of the first sand mixing truck, the other end of the first sand mixing truck is connected with one end of the first pump truck, and the other end of the first pump truck is connected with the oil pipe;
the first liquid storage tank is used for storing the first clear water, and the first sand storage vehicle is used for storing the first precoated sand and the second precoated sand; the first sand mixing truck is used for mixing the first clear water, the first precoated sand and the second precoated sand to obtain a sand carrying liquid;
the first pump truck is used for pumping the sand-carrying fluid from the oil pipe to a second layer of the target well.
In another possible implementation, the pumping the first volume of the replenishment solution from the casing to the first formation site includes:
pumping the first volume of the replenishment solution from the casing into the first formation level via a second pumping apparatus;
wherein the second pumping apparatus comprises: a second liquid storage tank and a second pump truck;
the second liquid storage tank is connected with one end of the second pump truck, and the other end of the second pump truck is connected with the sleeve;
the second liquid storage tank is used for storing the supplementary liquid, and the second pump truck is used for pumping the supplementary liquid from the sleeve to the first layer position.
In another possible implementation manner, the first pumping apparatus further includes: a third pump truck;
one end of the third pump truck is connected with the first sand mixing truck, and the other end of the third pump truck is connected with the oil pipe;
and the third pump truck is used for pumping the sand carrying liquid from the oil pipe to the second layer when the first pump truck is in fault.
In another possible implementation manner, the second pumping apparatus further includes: a fourth pump truck;
one end of the fourth pump truck is connected with the second liquid storage tank, and the other end of the fourth pump truck is connected with the sleeve;
and the fourth pump truck is used for pumping the supplementing liquid from the sleeve to the first layer level when the second pump truck fails.
The technical scheme provided by the embodiment of the application has the following beneficial effects:
the sand control construction technology that this application embodiment provided, the water absorption capacity of the preceding survey first position and second position obtains first volume and second volume respectively, then carries out the pressure testing to sleeve pipe and oil pipe, after the pressure testing is qualified, from oil pipe to the second position pump in the sand-carrying liquid of second volume to and from the sleeve pipe to the make-up fluid of first volume of first position pump in, first position is located the top of second position. The supplementing liquid can supplement the pressure of the first layer lost above the second layer, and the rest supplementing liquid goes down to prevent the sand-carrying liquid pumped in from the oil pipe from going upwards, so that the first precoated sand and the second precoated sand in the sand-carrying liquid from going upwards along with the sand-carrying liquid are prevented from going upwards, the sand prevention pipe column is prevented from being locked, the oil pipe is not easy to pull out, and the sand prevention effect is improved.
Drawings
FIG. 1 is a schematic diagram of a sand control construction process provided by an embodiment of the present application;
FIG. 2 is a schematic diagram of an embodiment of the present disclosure for pumping a sand-carrying fluid from a tubing to a second formation and pumping a make-up fluid from a casing to a first formation;
FIG. 3 is a schematic diagram of an embodiment of the present disclosure providing a method of pumping a sand-carrying fluid from a tubing to a second formation via a first pumping apparatus and pumping a make-up fluid from a casing to the first formation via the second pumping apparatus;
fig. 4 is a schematic diagram of another example of pumping the sand-carrying fluid from the oil pipe to the second zone through the first pumping apparatus and pumping the make-up fluid from the casing to the first zone through the second pumping apparatus.
Detailed Description
In order to make the technical solutions and advantages of the present application more clear, the following describes the embodiments of the present application in further detail.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The embodiment of the application provides a sand control construction process, and referring to fig. 1, the process comprises the following steps:
step 101: measuring the water uptake of a first level of the target well to obtain a first volume, and measuring the water uptake of a second level of the target well to obtain a second volume.
The target well is an oil-water well to be subjected to sand prevention construction. The first layer position is a layer position which does not need sand control construction in the target well, the second layer position is a layer position which needs sand control construction in the target well, and the first layer position is located above the second layer position.
In this step, when the water absorption capacity of the first level and the water absorption capacity of the second level are measured, the water absorption capacities of the first level and the second level under the same pressure can be measured. For example, the water uptake at a first pressure is measured for the first and second level, and the water uptake at a second pressure is measured for the first and second level, and the water uptake at a third pressure is measured for the first and second level, etc. When measuring the water absorption capacity of the first layer under different pressures, a plurality of first volumes can be obtained; accordingly, when measuring the water uptake at different pressures for the second level, a plurality of second volumes can be obtained.
The first layer position is located above the second layer position, so that the water absorption capacity of the first layer position under different pressures can be measured independently, but the mode of measuring the water absorption capacity of the second layer position independently is not easy to realize. Thus, in embodiments of the present application, the water uptake of the second level may be derived from the difference between the common water uptake of the first level and the second level and the water uptake of the first level alone.
For example, the first layer absorbs water at the first pressure in a first volume, and the first layer and the second layer absorb water together in a fourth volume at the first pressure, and the second layer absorbs water at the first pressure in a difference between the fourth volume and the first volume, that is, the second volume is a difference between the fourth volume and the first volume.
The pressure for measuring the water absorption amount of the first layer and the second layer may be set and changed as needed, which is not specifically limited in the embodiment of the present application. For example, the measurement pressure may be 15MPa, 20MPa, 25MPa, 35MPa, or the like.
In addition, before this step, the casing may be blocked by sand in the formation due to the sand production phenomenon, and therefore, before the measurement, the casing needs to be cleaned. And when the first layer is leaked in the cleaning process, measuring the water absorption capacity of the first layer under different pressures. After measuring the water absorption capacity of the first layer under different pressures, the casing pipe is continuously cleaned, and when the second layer, namely the layer needing sand control construction, leaks, the common water absorption capacity of the first layer and the second layer under the different pressures is measured, so that the water absorption capacity of the second layer under the different pressures is obtained.
The method comprises the following steps that the water absorption capacity of a first layer under different pressures is measured in the step, and then the water absorption capacity is used for pumping the supplementary liquid with corresponding volume according to the pressure in the casing pipe; and measuring the water absorption capacity of the second layer under different pressures, and pumping the sand carrying liquid with corresponding volume according to the pressure in the oil pipe. See step 102 for details.
The sand control construction technology that this application embodiment provided, for the sand control construction technology of high-span position, the position interval between first position and the second position is also great promptly, exceeds the third threshold value that predetermines. For example, the third preset threshold is 300m, 400m or 500 m. In the embodiments of the present application, this is not particularly limited.
Step 102: and (2) putting an oil pipe into the casing arranged in the target well, putting the oil pipe to a position with a preset distance away from the layer top of the second layer of the target well, carrying out pressure test on the casing and the oil pipe, pumping the second volume of sand-carrying liquid from the oil pipe to the second layer and pumping the first volume of supplementary liquid from the casing to the first layer after the pressure test is qualified.
The replenishing liquid is used for preventing the sand carrying liquid from returning upwards.
It should be noted that, in the related art, only the sand-carrying fluid is pumped from the oil pipe, and since the amount of the pumped sand-carrying fluid is generally large, the precoated sand in the sand-carrying fluid returns upwards along with the sand-carrying fluid, the returned precoated sand is consolidated under the action of the formation temperature, and the consolidated precoated sand may lock the sand control pipe column, so that the oil pipe is not easy to come out, and the sand control effect is poor. Wherein, the sand control tubular column includes oil pipe and other parts. In the embodiment of the present application, referring to fig. 2, when the sand-carrying fluid is pumped from the oil pipe to the second layer, a supplementary fluid is also pumped from the casing pipe to the first layer, the supplementary fluid can supplement the pressure of the lost first layer above the second layer, and the remaining supplementary fluid flows downward to prevent the sand-carrying fluid pumped from the oil pipe from flowing upward, so that the first coated sand and the second coated sand in the sand-carrying fluid from flowing upward along with the sand-carrying fluid, thereby preventing the sand-preventing pipe column from being locked and preventing the oil pipe from being lifted out easily.
In the process of pumping the sand-carrying fluid and the supplementing fluid, the pressure of the oil pipe, the pressure of the casing pipe, the discharge capacity of the sand-carrying fluid in the oil pipe and the discharge capacity of the supplementing fluid in the casing pipe are checked in time, and the pressure balance of the pipe shoe part between the oil pipe and the second layer position is kept, so that the purpose that the sand-carrying fluid cannot return upwards is achieved.
In one possible implementation, the make-up fluid may be pumped while the sand-carrying fluid is pumped; or the make-up fluid can be pumped in within a preset time interval after the sand carrying fluid is pumped in. In the embodiments of the present application, this is not particularly limited. The preset time interval may be set and changed as needed, and is not particularly limited in the embodiment of the present application. For example, the preset time interval may be 1min, 2min, or 10 min.
The preset distance may be set and changed as needed, and is not particularly limited in the embodiment of the present application. For example, the preset distance is 40m, 50m, or 60 m. In one possible implementation, when the layer top of the second horizon is located 1800m of the target downhole, and the preset distance is 50m, the tubing is lowered to 1750 m.
Introduction of the sand-carrying fluid: in an embodiment of the present application, a sand-carrying fluid includes: the device comprises first clean water, first precoated sand and second precoated sand;
the first precoated sand includes: raw material sand and coating resin, wherein the coating resin is coated on the surface of the raw material sand;
the second precoated sand includes: raw material sand and a curing agent, wherein the curing agent is coated on the surface of the raw material sand.
Wherein the proportion of the first precoated sand and the second precoated sand in the first clear water is not more than 15%. The proportion of the first precoated sand and the second precoated sand in the first clear water can be set and changed as required, and this is not particularly limited in the embodiment of the present application. For example, the first precoated sand and the second precoated sand account for 10%, 12%, or 15% of the first clear water.
When the proportion of the first precoated sand and the second precoated sand in the first clear water is 15%, the preparation process of the sand carrying liquid can be as follows: preparing first clear water 100m3Uniformly adding 0.4-0.8mm of first precoated sand and 0.4-0.8mm of second precoated sand into the mixture at the beginning, wherein the total thickness of the first precoated sand and the second precoated sand is 8.0m3The sand carrying ratio is controlled to be 5 to 10 percentLeft and right. When the pressure in the sand mixing truck is stable or the pressure is reduced, the sand carrying ratio is gradually increased to 15 percent until the sand adding amount is finished, namely the first precoated sand and the second precoated sand are added together by 15m3。
The coating resin may be set and modified as needed, and is not particularly limited in the embodiments of the present application. For example, the coating resin may be a modified epoxy resin. The curing agent may be set and modified as needed, and is not particularly limited in the examples of the present application. For example, the curing agent may be an epoxy resin curing agent.
The first precoated sand and the second precoated sand that this application embodiment provided can the interact of mutually supporting, under the stratum temperature effect, can fast curing to improve the sand control construction progress. And only include a tectorial membrane sand in the sand-carrying liquid among the correlation technique, this tectorial membrane sand is conventional tectorial membrane sand, and the consolidation time is long, leads to influencing sand control construction progress.
In a possible implementation manner, the first precoated sand and/or the second precoated sand further includes: at least one of a plasticizer, carboxymethyl cellulose, and an accelerator.
Wherein the plasticizer is mainly used for increasing the strength of the first precoated sand and/or the second precoated sand. The plasticizer may be at least one of dibutyl phthalate, dimethyl phthalate and silane.
The carboxymethyl cellulose is mainly used for increasing the viscosity of the first precoated sand and/or the second precoated sand and improving the suspension property of the first precoated sand and/or the second precoated sand in the first clear water.
The accelerant is mainly used for enhancing the flowability of the first precoated sand and/or the second precoated sand in the first clear water and preventing the first precoated sand and/or the second precoated sand from caking in the first clear water. The accelerator can be calcium stearate, and the calcium stearate not only can enhance the flowability of the first coated sand and/or the second coated sand in the first clear water, but also can improve the thermal cracking resistance of the first coated sand and/or the second coated sand. With the deepening of the stratum, the temperature of the stratum gradually rises, and the temperature resistance requirement on the first precoated sand and/or the second precoated sand is higher. The first precoated sand and the second precoated sand provided by the embodiment of the application both have good high-temperature resistance.
Introduction of the first pumping apparatus: in one possible implementation, a second volume of the sand-laden fluid may be pumped from the tubing to the second level by the first pumping apparatus; wherein the first pumping apparatus comprises: the system comprises a first liquid storage tank, a first pump truck, a first sand mixing truck and a first sand storage truck;
the first liquid storage tank is connected with one end of the first sand mixing truck, the other end of the first sand mixing truck is connected with one end of the first pump truck, and the other end of the first pump truck is connected with the oil pipe;
the first sand mixing truck is used for mixing the first clear water, the first precoated sand and the second precoated sand to obtain a sand carrying liquid;
the first pump truck is used for pumping the sand-carrying fluid from the oil pipe to the second layer of the target well.
Introduction of the second pumping apparatus: in one possible implementation, a first volume of make-up fluid may be pumped from the casing to the first level via a second pumping device; wherein the second pumping apparatus comprises: a second liquid storage tank and a second pump truck;
the second liquid storage tank is connected with one end of the second pump truck, and the other end of the second pump truck is connected with the sleeve;
the second liquid storage tank is used for storing supplementary liquid, and the second pump truck is used for pumping the supplementary liquid from the sleeve pipe to the first layer position.
The schematic diagram of pumping the make-up fluid into the first layer level can be seen in fig. 3, in which the first pumping equipment is connected with the oil pipe and pumps the sand-carrying fluid into the second layer level, and the second pumping equipment is connected with the casing pipe.
Introduction of the first liquid reservoir and the second liquid reservoir: the volume of the liquid stored in the first liquid storage tank and the volume of the liquid stored in the second liquid storage tank can be the same or different, and in the embodiment of the application, the volumes of the liquid stored in the first liquid storage tank and the liquid stored in the second liquid storage tank are the same. When the volumes of the first liquid storage tank and the second liquid storage tank are the same, the volumes of the first liquid storage tank and the second liquid storage tank can be the sameIs 40m3、50m3Or 60m3。
Introduction of the third pump truck: when first pump truck trouble, can't pump into when carrying sand liquid, in this application embodiment, can also go into from oil pipe to second position pump carrying sand liquid through the third pump truck. Correspondingly, the first pumping apparatus further comprises: a third pump truck;
one end of the third pump truck is connected with the first sand mixing truck, and the other end of the third pump truck is connected with the oil pipe;
and the third pump truck is used for pumping the sand-carrying liquid from the oil pipe to the second layer when the first pump truck is in fault.
The third pump truck can be respectively connected with the first sand mixing truck and the oil pipe through a three-way valve, and the three-way valve can be closed when the sand-carrying liquid is pumped in through the first pump truck; when the first pump truck breaks down, the third pump truck is started to pump the sand-carrying liquid, and the three-way valve can be opened.
Introduction of the fourth pump truck: when the second pump truck is in fault and cannot pump the supplementary liquid, in the embodiment of the application, the supplementary liquid can be pumped from the sleeve to the first layer position through the fourth pump truck. Correspondingly, the second pumping apparatus further comprises: a fourth pump truck;
one end of a fourth pump truck is connected with the second liquid storage tank, and the other end of the fourth pump truck is connected with the sleeve;
and the fourth pump truck is used for pumping the supplementary liquid from the sleeve to the first layer level when the second pump truck fails.
The fourth pump truck can also be respectively connected with the second liquid storage tank and the sleeve through a three-way valve, and the three-way valve can be closed when the supplementary liquid is pumped in through the second pump truck; when the second pump truck breaks down, the third pump truck is started to pump in the supplementary liquid, and the three-way valve can be opened.
When the first pumping device further comprises a third pump truck and the second pumping device further comprises a fourth pump truck, the schematic diagram of pumping the sand-carrying fluid into the second layer and pumping the make-up fluid into the first layer through the first pumping device and the second pumping device respectively can be seen in fig. 4.
Introduction of a casing and oil pipe pressure test process: in this step, the process of pressure testing of the casing and the oil pipe can be as follows: running the packer from the casing to a position above the second horizon; testing the pressure of the casing and the oil pipe above the second layer; and when the pressure difference between the pressure in the casing above the second position and the pressure in the oil pipe above the second position within the second preset time is smaller than a fourth preset threshold value, determining that the pressure test of the casing and the oil pipe is qualified.
In one possible implementation, the pressure of the casing and tubing pressure test above the second level may be the same or different. In the embodiment of the application, the pressure for pressure test of the casing and the pressure for pressure test of the oil pipe can be set according to the field requirement. For example, casing and tubing above the second level are tested at different pressures. In a possible implementation manner, the pressure for pressure testing of the casing above the second level may be 15MPa, and the pressure for pressure testing of the oil pipe above the second level may be 20 MPa.
In a possible implementation manner, the second preset time period may be set and changed as needed, and this is not specifically limited in the embodiment of the present application. For example, the second preset time period may be 30min, 40min, or 60 min. The fourth preset threshold may be set and changed as needed, and is not particularly limited in the embodiment of the present application. For example, the fourth preset threshold may be 0.4MPa, 0.5MPa, or 0.6 MPa. And when the second preset time is 30min and the fourth preset threshold is 0.5MPa, namely the pressure difference between the pressure in the casing above the second position and the pressure in the oil pipe above the second position within 30min is less than 0.5MPa, determining that the pressure tests of the casing and the oil pipe are qualified.
In a possible implementation manner, after the pressure test of the casing and the oil pipe is qualified, before the sand-carrying fluid and the make-up fluid are pumped, the process may further include: and after the pressure test is qualified, other parts except the oil pipe in the sand control pipe column, such as a sand control screen pipe, are put into the sand control pipe column. Installing a wellhead, then sequentially connecting the first pumping equipment and the second pumping equipment, testing the pressure of the first pumping equipment and the second pumping equipment after the first pumping equipment and the second pumping equipment are connected, injecting second clean water into the oil pipe after the pressure tests of the first pumping equipment and the second pumping equipment are qualified, positively circulating to wash the well until the second clean water returns from the casing, and closing a gate of the casing; and injecting third clean water from the oil pipe, and pumping a second volume of sand-carrying liquid from the oil pipe to the second layer position through the first pumping equipment and pumping a first volume of supplementary liquid from the casing to the first layer position through the second pumping equipment when the pressure of the oil pipe is lower than a first preset threshold value and the discharge capacity of the third clean water is larger than a second preset threshold value.
The first preset threshold and the second preset threshold may be set and changed as needed, and are not specifically limited in this embodiment of the application. The first preset threshold value can be pressure when the oil pipe is subjected to pressure testing. For example, if the pressure at which the oil pipe is pressure-tested is 20MPa, the first preset threshold value may be 20 MPa. The second preset threshold may be 700L/min, 800L/min or 900L/min.
For example, when the first preset threshold is 20MPa and the second preset threshold is 800L/min, the process is to inject third clean water from the oil pipe, and when the pressure of the oil pipe is lower than 20MPa and the discharge capacity of the third clean water is greater than 800L/min, a second volume of sand-carrying fluid is pumped from the oil pipe to the second layer, and a first volume of make-up fluid is pumped from the casing to the first layer.
The model of the installed wellhead can be set and changed as required, and in the embodiment of the present application, this is not particularly limited. For example, the wellhead may be installed in a model number of 250 or 350. Different types correspond to different bearing strengths.
The pressure for performing pressure testing on the first pumping device and the second pumping device may be set and changed as needed, which is not specifically limited in the embodiment of the present application. For example, the pressure for pressure testing of the first pumping device and the second pumping device may be 25MPa or 30 MPa. When the first pumping equipment and the second pumping equipment are subjected to pressure testing, the first pumping equipment and the second pumping equipment are not punctured or leak-proof within 1min, and the pressure testing of the equipment is qualified.
The second clear water and the third clear water can be the same or different, and when the second clear water and the third clear water are the same, the second clear water and the third clear water can be both treated water carried in oil extracted from a target well before sand control construction.
In one possible implementation, before running the oil pipe into the casing, the process may further include: cleaning sand in the casing, and injecting fourth clean water from the casing, wherein the fourth clean water is used for flushing the sand in the casing to the bottom of the well; and then, a drift size gauge is lowered to a second position from the casing, and when the drift size gauge is not blocked in the process of lowering, an oil pipe is lowered into the casing, so that the casing is ensured not to be bent and deformed and is a good casing.
Step 103: and after the sand-carrying liquid is pumped into the second layer, pumping a third volume of displacement liquid from the oil pipe to the second layer.
The displacement fluid is mainly used for flushing the sand-carrying fluid in the oil pipe and preventing the first precoated sand and/or the second precoated sand in the sand-carrying fluid from being attached to the pipe wall of the oil pipe.
In one possible implementation, the third volume of displacement fluid pumped is no less than the volume of tubing entering the formation. The volume of the oil pipe entering the target well can be calculated according to the inner diameter of the oil pipe and the depth of the oil pipe entering the target well. For example, if the inner diameter of the tubing is 60mm and the depth of the tubing into the target well is 1000m, the volume of the tubing entering the target well is 2.8m3The volume of the displacement liquid pumped in is not less than 2.8m3(ii) a For another example, if the inner diameter of the oil pipe is 70mm, the depth of the oil pipe entering the target well is 1750m, and the volume of the oil pipe entering the target well is 6.7m3The volume of the displacement liquid pumped in is not less than 6.7m3. In the embodiment of the present application, the third volume of the pumped displacement fluid may be calculated according to the needs of the field, and is not particularly limited herein.
Introduction of first clear water, make-up fluid and displacement fluid: in one possible implementation, the first clear water, the make-up fluid, and the displacement fluid in the sand-carrying fluid may be the same, and may be treated water carried in the oil produced from the target well before sand control construction. The compatibility of water and stratum carried in the oil extracted from the target well is good, the oil can be recycled, the cost is saved, and the cost is reduced to the greatest extent on the premise of ensuring that the sand-carrying liquid does not return upwards.
In a possible implementation manner, when the first clear water and the displacement liquid are the same, a third volume of displacement liquid may be pumped from the oil pipe to the second level by the first pumping device, in which case the first coated sand and the second coated sand are not added any more, and the third volume of first clear water may be pumped from the oil pipe to the second level directly by the first pump truck or the third pump truck.
Step 104: and closing the gate of the oil pipe and the gate of the sleeve, waiting for the first precoated sand and the second precoated sand to be cemented and cured, and lowering the oil pipe to the bottom of the target well when the first preset time length is reached.
The well bottom is positioned below the second position, and after the first precoated sand and the second precoated sand are cemented and cured, the sand in the second position can be prevented from entering the oil pipe to block the oil pipe.
The first preset time period may be set and changed as needed, and is not specifically limited in this application embodiment. For example, the first preset time period may be 24h, 48h or 72 h. In the embodiment of the present application, the first preset time period is taken as 48h for example, that is, after the gate of the oil pipe and the gate of the casing are closed for 48h, the oil pipe is lowered to the bottom of the well.
In one possible implementation, after waiting for a first predetermined period of time, the first and second coated sands may have been cemented and cured, and thus, an obstruction may be encountered while running the tubing downhole, in which case the tubing may be pulled out first and then run into a drill bit, and the cemented and cured first and second coated sands may be drilled out by the drill bit. Be equipped with the punchhole on this drill bit, pour into the clear water through this punchhole, can bore and remove first tectorial membrane sand and second tectorial membrane sand and wash first tectorial membrane sand and the second tectorial membrane sand that bores away simultaneously. And after the first precoated sand and the second precoated sand are drilled, lowering the oil pipe to the bottom of the well again, and then executing the subsequent operation of oil recovery from the target well.
The sand control construction technology that this application embodiment provided, the water absorption capacity of the preceding survey first position and second position obtains first volume and second volume respectively, then carries out the pressure testing to sleeve pipe and oil pipe, after the pressure testing is qualified, from oil pipe to the second position pump in the sand-carrying liquid of second volume to and from the sleeve pipe to the make-up fluid of first volume of first position pump in, first position is located the top of second position. The supplementing liquid can supplement the pressure of the first layer lost above the second layer, and the rest supplementing liquid goes down to prevent the sand-carrying liquid pumped in from the oil pipe from going upwards, so that the first precoated sand and the second precoated sand in the sand-carrying liquid from going upwards along with the sand-carrying liquid are prevented from going upwards, the sand prevention pipe column is prevented from being locked, the oil pipe is not easy to pull out, and the sand prevention effect is improved.
The above description is only for facilitating the understanding of the technical solutions of the present application by those skilled in the art, and is not intended to limit the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (11)
1. A sand control construction process, characterized in that the process comprises:
measuring the water absorption of a first layer of a target well to obtain a first volume, and measuring the water absorption of a second layer of the target well to obtain a second volume, wherein the first layer is a layer which does not need sand control construction in the target well, the second layer is a layer which needs sand control construction in the target well, and the first layer is positioned above the second layer;
the method comprises the following steps of putting an oil pipe into a casing arranged in a target well, putting the oil pipe down to a preset distance away from the layer top of a second layer of the target well, carrying out pressure test on the casing and the oil pipe, pumping the sand-carrying liquid with the second volume from the oil pipe to the second layer and pumping the supplementary liquid with the first volume from the casing to the first layer after the pressure test is qualified, wherein the supplementary liquid is used for preventing the sand-carrying liquid from returning upwards, and comprises the following steps: first clear water, first tectorial membrane sand and second tectorial membrane sand, first tectorial membrane sand includes: the coating resin is coated on the surface of the raw material sand; the second precoated sand includes: the raw material sand and the curing agent are coated on the surface of the raw material sand;
after the sand-carrying fluid is pumped in, pumping a third volume of displacement fluid from the oil pipe to the second layer;
and closing the gate of the oil pipe and the gate of the casing, waiting for the first precoated sand and the second precoated sand to be cemented and cured, and lowering the oil pipe to the bottom of the target well when the first preset time length is reached, wherein the bottom of the well is positioned below the second position.
2. The process of claim 1, wherein the coating resin is a modified epoxy resin;
the curing agent is an epoxy resin curing agent.
3. The process of claim 1, wherein the first coated sand and the second coated sand in the sand-carrying fluid account for no more than 15% of the first clear water.
4. The process of claim 1, wherein the first and/or second coated sand further comprises: at least one of a plasticizer, carboxymethyl cellulose, and an accelerator.
5. The process of claim 4, wherein the plasticizer is at least one of dibutyl phthalate, dimethyl phthalate, and silane.
6. The process of claim 4, wherein the accelerator is calcium stearate.
7. The process of claim 1, wherein prior to pumping the second volume of the sand-laden fluid from the tubing to the second formation and pumping the first volume of the makeup fluid from the casing to the first formation, the process further comprises:
injecting second clean water from the oil pipe, washing the well in a positive circulation mode until the second clean water returns from the casing, and closing a gate of the casing;
and injecting third clean water from the oil pipe, and when the pressure of the oil pipe is lower than a first preset threshold value and the discharge capacity of the third clean water is larger than a second preset threshold value, performing the steps of pumping the second volume of the sand-carrying liquid from the oil pipe to the second layer and pumping the first volume of the replenishing liquid from the casing pipe to the first layer.
8. The process of claim 1, wherein pumping the second volume of sand-laden fluid from the tubing to the second formation comprises:
pumping the second volume of sand-laden fluid from the tubing to the second formation via a first pumping apparatus;
wherein the first pumping apparatus comprises: the system comprises a first liquid storage tank, a first pump truck, a first sand mixing truck and a first sand storage truck;
the first liquid storage tank is connected with one end of the first sand mixing truck, the other end of the first sand mixing truck is connected with one end of the first pump truck, and the other end of the first pump truck is connected with the oil pipe;
the first liquid storage tank is used for storing the first clear water, and the first sand storage vehicle is used for storing the first precoated sand and the second precoated sand; the first sand mixing truck is used for mixing the first clear water, the first precoated sand and the second precoated sand to obtain a sand carrying liquid;
the first pump truck is used for pumping the sand-carrying fluid from the oil pipe to a second layer of the target well.
9. The process of claim 1 or 8, wherein said pumping said first volume of make-up fluid from said casing to said first formation comprises:
pumping the first volume of the replenishment solution from the casing into the first formation level via a second pumping apparatus;
wherein the second pumping apparatus comprises: a second liquid storage tank and a second pump truck;
the second liquid storage tank is connected with one end of the second pump truck, and the other end of the second pump truck is connected with the sleeve;
the second liquid storage tank is used for storing the supplementary liquid, and the second pump truck is used for pumping the supplementary liquid from the sleeve to the first layer position.
10. The process of claim 8, wherein the first pumping apparatus further comprises: a third pump truck;
one end of the third pump truck is connected with the first sand mixing truck, and the other end of the third pump truck is connected with the oil pipe;
and the third pump truck is used for pumping the sand carrying liquid from the oil pipe to the second layer when the first pump truck is in fault.
11. The process of claim 9, wherein the second pumping apparatus further comprises: a fourth pump truck;
one end of the fourth pump truck is connected with the second liquid storage tank, and the other end of the fourth pump truck is connected with the sleeve;
and the fourth pump truck is used for pumping the supplementing liquid from the sleeve to the first layer level when the second pump truck fails.
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