阅读说明：本技术 一种用于黄土层井孔内导管的封固方法及封固装置 (Sealing method and sealing device for conduit in loess layer well bore ) 是由 王伟良 张建卿 李雪岗 侍德益 李德波 胡祖彪 朱明明 王清臣 韩成福 张健 陈 于 2020-12-08 设计创作，主要内容包括：本发明涉及石油钻井施工技术领域,具体涉及一种用于黄土层井孔内导管的封固方法及封固装置,通过先将靠近井底的导管外壁与井孔内壁之间的缝隙进行封隔固井；将靠近井孔口处的导管外壁与井孔内壁之间的缝隙进行封隔固井,靠近井底的导管外壁与井孔内壁之间的缝隙采用环保浇固材料固井,靠近井孔口处的导管外壁与井孔内壁之间的缝隙采用黄土填充,即可满足黄土层内钻井后井孔内导管的封固,不会发生漏失现象,进一步的靠近井孔口处的导管外壁与井孔内壁之间的缝隙采用环保浇固材料固井,使其固井效果更好,更加不会产生漏失,不会造成环境污染的现象发生,固井效果更佳。(The invention relates to the technical field of petroleum drilling construction, in particular to a sealing method and a sealing device for a conduit in a loess layer well hole, which are used for sealing and cementing a gap between the outer wall of the conduit close to the well bottom and the inner wall of the well hole; the gap between the outer wall of the guide pipe close to the well hole opening and the inner wall of the well hole is sealed and fixed, the gap between the outer wall of the guide pipe close to the well bottom and the inner wall of the well hole is fixed by environment-friendly pouring and fixing materials, the gap between the outer wall of the guide pipe close to the well hole opening and the inner wall of the well hole is filled by loess, the sealing of the guide pipe in the well hole after the well is drilled in the loess layer can be met, the leakage phenomenon can not occur, the gap between the outer wall of the guide pipe close to the well hole opening and the inner wall of the well hole is fixed by environment-friendly pouring and fixing materials, the well fixing effect is better, the leakage can not occur, the.)

1. A sealing method for a conduit in a loess layer well hole is characterized by comprising the following steps: comprises the following steps

The method comprises the following steps: well bottom packing well cementation

Sealing and cementing a gap between the outer wall of a guide pipe close to the bottom of a well and the inner wall of a well hole;

step two: well head packing well cementation

And on the basis of the step one, sealing and cementing the gap between the outer wall of the conduit close to the borehole port and the inner wall of the borehole.

2. The method for sealing a conduit in a loess layer borehole, according to claim 1, wherein: in the first step, the well bottom packing and well cementation adopt environment-friendly casting materials for well cementation, and in the second step, the well head packing and well cementation adopts loess filling.

3. The method for sealing a conduit in a loess layer well bore according to claim 2, wherein: and in the second step, the well mouth packing and well cementation adopt environment-friendly casting materials for well cementation.

4. A method for sealing a conduit in a loess layer borehole according to claim 1, 2 or 3, wherein: the environment-friendly pouring material is a foaming agent, and the foaming agent is formed by mixing an agent A and an agent B according to the mass ratio of 1: 1.

5. The method for sealing a conduit in a loess layer well bore according to claim 2, wherein: and in the first step, the bottom of the well is sealed by an internal and external annular space by adopting an environment-friendly pouring material, and the depth of the internal and external annular space sealing well cementation is 0.1-20 m.

6. The method for sealing a conduit in a loess layer borehole according to claim 2 or 5, wherein: when the shaft bottom packing well cementation adopts the environment-friendly casting material for well cementation, the environment-friendly casting material is continuously cast and fixed in a certain time through a sealing device, and then the packing well cementation of a gap between the outer wall of the guide pipe close to the opening of the well hole and the inner wall of the well hole is carried out after the environment-friendly casting material is solidified for 30 minutes.

7. A sealing apparatus for a conduit in a loess layer borehole, comprising a sealing method for a conduit in a loess layer borehole according to any one of claims 1 to 6, wherein: the sealing device comprises a mixing mechanism, a pump injection system and a pipeline, wherein one end of the pump injection system is communicated with the environment-friendly pouring material through the pipeline, and the other end of the pump injection system is connected with the mixing mechanism through the pipeline.

8. The sealing device for the loess layer borehole vessel according to claim 7, wherein: the pump system of annotating include two sets of piston pumps (22), the pipeline includes liquid pipeline (24) and gas line (25), the one end of two sets of piston pumps (22) all through liquid pipeline (24) respectively with the environmental protection water solid material intercommunication, the other end of two sets of piston pumps (22) respectively through liquid pipeline (24) and mixing mechanism intercommunication, and the tip of liquid pipeline (24) extends to in the mixing mechanism.

9. The sealing device for the loess layer borehole vessel according to claim 8, wherein: the pump filling system further comprises a group of air compression pumps (23), the air compression pumps (23) are communicated with the mixing mechanism through gas pipelines (25), the end parts of the gas pipelines (25) extend into the mixing mechanism, and the end part extending sections of the gas pipelines (25) connected with the air compression pumps (23) are located in the middle of the pipelines connected with the two groups of piston pumps (22).

10. The sealing device for the loess layer borehole vessel according to claim 7, wherein: the mixing mechanism is a liquid mixing head (21).

Technical Field

The invention relates to the technical field of petroleum drilling construction, in particular to a sealing method and a sealing device for a conduit in a loess layer well bore.

Background

The existing conduit sealing method in oil drilling construction comprises a first method, a second method and a third method, wherein the first method comprises the following steps: the existing pipe fixing adopts a kelly bar or a joint, cement is injected from a vertical pipe to fix the well or a cement head is connected on the surface of a drilling platform to fix the well at the joint, the amount of ash, the amount of cement slurry and the density are strictly controlled when the pipe is fixed, the hollow inner annulus cannot be replaced when the amount is replaced, and a cement plug must be reserved in the pipe. Has the disadvantages of high cost, long waiting time and complex working procedure, and leaves a cement sheath to leave hidden troubles for later construction.

The second method comprises the following steps:

a conduit bottom plug: the guide pipe is put into the shaft bottom, the hanging weight is released, the copper pin is cut off, the guide pipe nipple and the sliding sleeve slide relatively, the rubber sleeve expands in the axial direction under pressure and in the diameter direction, and an annular sealing ring is formed to seal the upper annular space and the lower annular space.

The disadvantages of this method are:

1. due to the poor compaction force of the loess layer and the erosion of the drilling fluid, the guide pipe can sink to different degrees basically;

2. the capsule seals the well wall by 10-15 cm, has short sealing time, and is easy to be soaked by drilling fluid, washed, relapsed and lost.

The third method comprises the following steps: catheter stopper

Small screw caps are welded up and down at the position of 0.5-1 m below the conduit, felt is wound to a certain thickness to form a waist drum shape with two small ends and a large middle part, and an iron wire penetrates through the small screw caps to be bundled to form a plug which is put into the well to seat and seal the inner annulus and the outer annulus.

The disadvantages of this method are: is easy to be soaked in drilling fluid to be washed, recur and lose.

The present invention provides a sealing method and a sealing device for a conduit in a loess layer borehole, in order to solve the above-mentioned problems in the prior art.

Disclosure of Invention

The invention overcomes the defects of the prior art, provides a sealing method and a sealing device for a conduit in a loess layer well bore, and particularly has the characteristics of no leakage and good sealing effect when the conduit is sealed during loess layer well drilling.

The technical problem solved by the invention can be realized by adopting the following technical scheme:

a method for sealing a conduit in a loess layer well bore comprises the following steps

The method comprises the following steps: well bottom packing well cementation

Sealing and cementing a gap between the outer wall of a guide pipe close to the bottom of a well and the inner wall of a well hole;

step two: well head packing well cementation

And on the basis of the step one, sealing and cementing the gap between the outer wall of the conduit close to the borehole port and the inner wall of the borehole.

In the first step, the well bottom packing and well cementation adopt environment-friendly casting materials for well cementation, and in the second step, the well head packing and well cementation adopts loess filling.

And in the second step, the well mouth packing and well cementation adopt environment-friendly casting materials for well cementation.

The environment-friendly pouring material is a foaming agent, and the foaming agent is formed by mixing an agent A and an agent B according to the mass ratio of 1: 1.

And in the first step, the bottom of the well is sealed by an internal and external annular space by adopting an environment-friendly pouring material, and the depth of the internal and external annular space sealing well cementation is 0.1-20 m.

When the shaft bottom packing well cementation adopts the environment-friendly casting material for well cementation, the environment-friendly casting material is continuously cast and fixed in a certain time through a sealing device, and then the packing well cementation of a gap between the outer wall of the guide pipe close to the opening of the well hole and the inner wall of the well hole is carried out after the environment-friendly casting material is solidified for 30 minutes.

A sealing device for a conduit in a loess layer well, comprising the sealing method for a conduit in a loess layer well as claimed in any one of the preceding claims, wherein: the sealing device comprises a mixing mechanism, a pump injection system and a pipeline, wherein one end of the pump injection system is communicated with the environment-friendly pouring material through the pipeline, and the other end of the pump injection system is connected with the mixing mechanism through the pipeline.

The pump system of annotating include two sets of piston pumps, the pipeline includes liquid pipeline and gas line, the one end of two sets of piston pumps all through liquid pipeline respectively with the environmental protection solid material intercommunication of watering, the other end of two sets of piston pumps is respectively through liquid pipeline and mixing mechanism intercommunication, and the tip of liquid pipeline extends to in the mixing mechanism.

The pump injection system further comprises a group of air compression pumps, the air compression pumps are communicated with the mixing mechanism through gas pipelines, the end parts of the gas pipelines extend into the mixing mechanism, and the end part extending sections of the gas pipelines connected with the air compression pumps are located in the middle of the pipelines connected with the two groups of piston pumps.

The mixing mechanism is a liquid mixing head.

The invention has the beneficial effects that:

compared with the prior art, the method and the well cementing device do not need large-scale equipment, do not need to produce water, adopt A, B agent mode in environment-friendly casting and setting materials, and can seal the outer annular space of the well cementing barrel by 10-15 meters in depth by A, B agents of each barrel (150L) of each well. The continuous construction can be carried out continuously, the continuous casting can be finished within 6 minutes, and the rest outer annular space on the upper part can be backfilled after the cement is cured for 30 minutes to finish the cement cementing construction. And the raw materials, the reaction process and the products are nontoxic, and the toxic and harmful effects and the safety risk in the transportation and construction processes are reduced to zero.

The gap between the outer wall of the guide pipe close to the shaft bottom and the inner wall of the well hole is sealed and fixed during actual construction, and after the inner and outer annular spaces are sealed and fixed, the gap between the outer wall of the guide pipe in the deep part of the well and the inner wall of the well hole can be fixed by loess or in chemical mode.

The gap between the outer wall of the guide pipe close to the shaft bottom and the inner wall of the well hole is cemented by environment-friendly cementing materials, the gap between the outer wall of the guide pipe close to the opening of the well hole and the inner wall of the well hole is filled with loess, the sealing of the guide pipe in the well hole after the well is drilled in the loess layer can be met, the leakage phenomenon can not occur, the gap between the outer wall of the guide pipe close to the opening of the well hole and the inner wall of the well hole is cemented by the environment-friendly cementing materials, the well cementation effect is better, the leakage can not be generated, the phenomenon of environmental pollution can not occur, and.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic of the process of the present invention.

Fig. 2 is a schematic structural diagram of the sealing device of the present invention.

FIG. 3 is a schematic view of the liquid mixing head of the present invention.

In the figure: 15-sealing device, 21-liquid mixing head; 22-a piston pump; 23-an air compression pump; 24-a liquid line; 25-gas line.

Detailed Description

It should be noted that, in the embodiments of the present invention, the terms referred to are:

and the sealing device 15 is used for injecting the environment-friendly pouring material for sealing into a gap between the outer wall of the guide pipe in the well and the inner wall of the well hole to seal the inner annulus and the outer annulus.

And the liquid mixing head 21 is used for mixing the agent A and the agent B in the environment-friendly cementing material and then injecting the mixture into a gap between the outer wall of the guide pipe in the well and the inner wall of the well hole for annular sealing.

And the piston pump 22 is used for pumping the agent A and the agent B in the environment-friendly pouring material into the liquid mixing head 21 for mixing, and then injecting the mixture into a gap between the outer wall of the guide pipe in the well and the inner wall of the well hole for annular sealing between the inner wall and the outer wall.

And the air pressure pump 23 is used for blowing the agent A and the agent B in the environment-friendly pouring material entering the liquid mixing head 21 away to fully mix the agents, so that the mixed materials are quickly foamed, and the effect of sealing and cementing the inner annulus and the outer annulus is achieved.

And a liquid line 24 for conveying the agent A and the agent B in the environment-friendly pouring material.

A gas line 25 for delivering atmospheric gas into the liquid mixing head 21.

The present invention provides a method and an apparatus for sealing a conduit in a loess layer borehole, which are described in detail in the following.

Example 1:

referring to fig. 1, which is a schematic view of a method for sealing a conduit in a loess layer borehole, the method for sealing a conduit in a loess layer borehole includes the following steps

The method comprises the following steps: well bottom packing well cementation

Sealing and cementing a gap between the outer wall of a guide pipe close to the bottom of a well and the inner wall of a well hole;

step two: well head packing well cementation

And on the basis of the step one, sealing and cementing the gap between the outer wall of the conduit close to the borehole port and the inner wall of the borehole.

The gap between the pipe outer wall that will be close to the shaft bottom and the wellhole inner wall seals the well cementation in above-mentioned implementation during actual construction, and satisfies the back with interior annular space sealing, and the gap between the pipe outer wall of above well depths and the wellhole inner wall all can adopt loess or at chemical well cementation, can effectually seal the sealing of well drilling back pipe in the loess in situ through this method, can not produce the leakage phenomenon after the sealing, can not cause environmental pollution.

Example 2:

further, in the step one, the well bottom packing and well cementation adopts environment-friendly casting materials for well cementation, and in the step two, the well mouth packing and well cementation adopts loess filling.

And further in the second step, the well mouth packing and well cementation adopt environment-friendly casting materials for well cementation.

And in the first step, the bottom of the well is sealed by an internal and external annular space by adopting an environment-friendly pouring material, and the depth of the internal and external annular space sealing well cementation is 0.1-20 m.

When the shaft bottom packing well cementation adopts the environment-friendly casting material for well cementation, the environment-friendly casting material is continuously cast and fixed in a certain time through a sealing device, and then the packing well cementation of a gap between the outer wall of the guide pipe close to the opening of the well hole and the inner wall of the well hole is carried out after the environment-friendly casting material is solidified for 30 minutes.

The gap between the outer wall of the guide pipe close to the shaft bottom and the inner wall of the well hole in the implementation is cemented by the environment-friendly cementing material, the gap between the outer wall of the guide pipe close to the opening of the well hole and the inner wall of the well hole is filled with loess, the sealing of the guide pipe in the well hole after the well is drilled in the loess layer can be met, the leakage phenomenon can not occur, the gap between the outer wall of the guide pipe close to the opening of the well hole and the inner wall of the well hole is cemented by the environment-friendly cementing material, the well cementation effect is better, the leakage can not occur, the phenomenon of environmental pollution can not be caused.

The inner and outer annular packing of the gap between the outer wall of the guide pipe close to the shaft bottom and the inner wall of the well hole is 0.1-20 m, so that the sealing of the guide pipe in the well hole after drilling in the loess layer can be met, the actual production middle part of the inner and outer annular packing well can not be lost, the environment can not be polluted, and the inner and outer annular packing well cementing depth is preferably 100 m, and the inner and outer annular packing effect is better. When the environment-friendly casting material is adopted for well cementation, the environment-friendly casting material is continuously cast in a certain time by a sealing device to avoid fault gaps and leakage phenomena, then the sealing and well cementation of a gap between the outer wall of a guide pipe close to a well hole and the inner wall of the well hole is carried out after the environment-friendly casting material is solidified for 30 minutes, the gap between the outer wall of the guide pipe close to the well hole and the inner wall of the well hole is suitable for filling and sealing with loess after the environment-friendly casting material is solidified for 30 minutes, if the environment-friendly casting material is also adopted for well cementation of the gap between the outer wall of the guide pipe close to the well hole and the inner wall of the well hole, the environment-friendly casting material is continuously injected until the position of the well hole when the environment-friendly casting material is injected.

Example 3:

the environment-friendly pouring material is further a foaming agent, and the foaming agent is formed by mixing an agent A and an agent B according to the mass ratio of 1: 1.

In the embodiment, the foaming agent A and the foaming agent B are mixed and injected into a gap between the outer wall of the guide pipe and the inner wall of the well hole in a mass ratio of 1:1 to perform well bottom internal and external annular space sealing and well cementation, then the upper part can be filled with loess, or can be continuously fixed with the foaming agent, when the foaming agent is continuously used for well cementation, the agent A and the agent B are continuously injected until the height of the injected liquid level from the well mouth is within 10 m, the gap between the outer wall of the whole guide pipe and the inner wall of the well hole can be filled after foaming, the whole guide pipe is sealed, and the leakage phenomenon can not occur after the sealing method is used for sealing, so that the environmental pollution can not be caused.

The mass ratio of the agent A and the agent B adopted as the foaming agent can be adjusted according to actual construction requirements and is not limited to the mass ratio of 1: 1.

The environment-friendly pouring material adopts a mode of an agent A and an agent B, the agent A and the agent B do not contain free TDI, the TDI is toluene diisocyanate, the foaming rate is selected to be about 10 times to adapt to the loess layer dry drilling outer annular space, each well needs A, B agents, each barrel is 150L, and the total amount is 300L, so that the requirement of 10-15 m depth of the outer annular space of a well hole can be sealed. The continuous construction can be carried out continuously, the casting displacement is controlled, 300L of A, B agent is cast continuously in 30 minutes, the rest outer annular space at the upper part can be backfilled after waiting for 30 minutes to finish the well cementation construction, and the outer annular space at the upper part can be filled with loess.

The foaming agent adopts polyurethane foaming filler, the polyurethane foaming filler consists of an agent A and an agent B, the agent A and the agent B in the polyurethane foaming filler both adopt environment-friendly and nontoxic materials, the agent A is polyether polyol, the agent B is isocyanate, the conveying flow ratio of the polyether polyol to the isocyanate is 1:1, and the foaming agent is prepared by mixing the polyether polyol and the isocyanateThe environment-friendly pouring material formed by the agent A and the agent B only needs 0.3m³The inner and outer annular spaces of the conduit can be sealed by pouring the solid material, and the raw material, the reaction process and the product are nontoxic, so that the toxic and harmful effects and the safety risk in the transportation and construction processes are reduced to zero.

The foaming agent in the conduit sealing adopts polyurethane foaming filler, 250kg is injected in a co-injection mode, the annulus returns 10 meters upwards, and the residual annulus is filled with loess.

The method and the environment-friendly pouring material adopted by the invention for cementing wells do not need to use large-scale equipment, the phenomenon does not need to produce water, each well needs A, B agents, each barrel is 150L, and the total amount is 300L, so that the outer annular space of the well cementing barrel can be sealed to the depth of 10-15 meters. The continuous construction can be carried out continuously, the continuous casting can be finished within 6 minutes, and the rest outer annular space on the upper part can be backfilled after the cement is cured for 30 minutes to finish the cement cementing construction. And the reaction process and the product of the environment-friendly casting and solidifying material are nontoxic, and the toxic and harmful effects and the safety risk are reduced to zero in the transportation and construction processes, so that the material is suitable for the well cementation effect in loess-soil drilling construction, cannot leak and cannot pollute the environment.

In the embodiment, cement can be adopted for well cementation, cement is adopted for bottom packing well cementation, loess is adopted for wellhead packing well cementation, or cement is adopted for outer annular space of the whole guide pipe to directly pack the guide pipe to the ground, so that the guide pipe is prevented from being lost.

Example 4:

referring to fig. 2 and 3, the schematic structural diagram of the sealing device used in the method for sealing the conduit in the loess layer borehole is shown.

A sealing device for loess layer downthehole pipe includes any one of the above-mentioned embodiments a sealing method for loess layer downthehole pipe, sealing device include mixing mechanism, pump notes system and pipeline, pump notes system one end through pipeline and environmental protection solid material intercommunication of watering, the pump notes system other end passes through pipeline connection mixing mechanism.

The agent A and the agent B in the environment-friendly pouring material are mixed through the mixing mechanism in the implementation, the pump injection system is used for injecting the agent A and the agent B into a gap between the outer wall of the guide pipe and the inner wall of the well hole, the pipeline is used for conveying the agent A and the agent B, well cementation is carried out through the structure, the structure is simple, the operation is convenient, and the construction efficiency is high.

Example 5:

the pumping system further comprises two groups of piston pumps 22, the pipelines comprise a liquid pipeline 24 and a gas pipeline 25, one ends of the two groups of piston pumps 22 are respectively communicated with the environment-friendly pouring material through the liquid pipeline 24, the other ends of the two groups of piston pumps 22 are respectively communicated with the mixing mechanism through the liquid pipeline 24, and the end part of the liquid pipeline 24 extends into the mixing mechanism.

The pumping system further comprises a group of air compression pumps 23, the air compression pumps 23 are communicated with the mixing mechanism through gas pipelines 25, the end parts of the gas pipelines 25 extend into the mixing mechanism, and the end part extension sections of the gas pipelines 25 connected with the air compression pumps 23 are positioned in the middle of the pipelines connected with the two groups of piston pumps 22.

The further mixing mechanism is a liquid mixing head 21.

In the above-mentioned embodiment the liquid mixing head 21 is a body structure, and the inclined plane that reduces through the bore that sets up of the first 21 body structures one end of liquid mixing forms vertebra platform type structure, then vertebra platform structure top connection with the unanimous connecting pipe nipple joint of vertebra platform structure top bore, vertebra platform bottom is unanimous with the bore of body structure, and fixed connection, the connecting pipe nipple joint be used for with two liquid pipeline 24 and the pipe wall connection of a gas pipeline 25.

During actual construction, two foaming raw materials of the agent A and the agent B are respectively input into inlets of two groups of piston pumps 22, outlets of an air compression pump 23 and outlets of the two groups of piston pumps 22 are parallelly led into a liquid mixing head 21, the liquid mixing head 21 generates and outputs foaming agents in the process that the two groups of piston pumps 22 and one group of air compression pump 23 output according to preset flow proportion, the liquid mixing head 21 is hung between a guide pipe and a well wall and is hung from bottom to top according to preset speed in the process of outputting the foaming agents, the two groups of foaming raw material liquids respectively flow out through a liquid pipeline 24 according to proportion under the action of different flow speeds of the speed-regulating piston pumps 22, and the air compression pump 23 blows out gas through a gas pipeline 25 to blow the two foaming raw materials apart, so that the two foaming raw materials are fully subjected to contact reaction, and the foaming speed is increased. Because of the characteristics of the foaming agent, the construction is carried out by adopting a mode of gradually lifting from the bottom to the top, namely a liquid pipeline 24 and a gas pipeline 25 are put into the bottom through a liquid mixing head 21, the liquid mixing head 21 is gradually lifted from the bottom to the top through calculating the foaming time until the foaming reaches the well mouth, and the sealing is finished, wherein the injection discharge capacity of the liquid mixing head 21 is more than 40L/min during the actual use, the liquid has good fluidity when being injected into an outer ring through the mixing head, can freely flow and pave the outer ring space and then carry out expansion curing, or only the outer ring space of the well is sealed to the depth of more than 0.1 meter, and then the rest outer ring space is backfilled and compacted by loess or other materials, so that the sealing cost is.

While the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and the scope of the present invention is within the scope of the claims.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

Technical solutions between various embodiments may be combined with each other, but must be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.