CN209780888U

CN209780888U - oil pad control and mining device for well and mine salt level well group

Info

Publication number: CN209780888U
Application number: CN201920449496.9U
Authority: CN
Inventors: 汤福彬; 魏勇; 王强; 陈光彬
Original assignee: Sichuan Salt Geological Drilling Brigade
Current assignee: Sichuan Salt Geological Drilling Brigade
Priority date: 2019-04-04
Filing date: 2019-04-04
Publication date: 2019-12-13
Anticipated expiration: 2029-04-04

Abstract

The utility model discloses an oil pad control and extraction device for a well and mine horizontal well group, which comprises a vertical well, wherein the vertical well is provided with a well head suspension device, the well head suspension device comprises a communicating pipe, an associated short section and an oil pipe hanger, and the oil pad control and extraction device also comprises a horizontal well, the horizontal well comprises a vertical well section, an inclination increasing section and a horizontal section, the horizontal section is communicated with the vertical well, and the horizontal well is also provided with a well head suspension device; the vertical well and the horizontal well are both sleeved with a surface casing, a technical casing and a central pipe at intervals from outside to inside, the central pipe is connected with a short section, and the technical casing is connected with a communicating pipe; the lower end of a central pipe of the horizontal well is arranged in the inclination increasing section of the horizontal well, and the lower end of the central pipe of the vertical well is lower than the lower end of the central pipe of the horizontal well; the utility model discloses can improve out steamed rate and recovery rate to effective control halite side is dissolved, realizes the bench layering and adopts steamed in order, prevents to block or reduce the crack passageway and takes place, avoids the sleeve pipe to crowd the geological disasters emergence that destroys, corrodes the perforation and arouse, reaches the purpose of ordering, scientific, rationalization exploitation.

Description

Oil pad control and mining device for well and mine salt level well group

Technical Field

The utility model relates to a horizontal well group's oil blanket accuse is adopted device for well mineral salt.

Background

At present, a single straight well is usually adopted for mining the salt mine, a wellhead is provided with a suspension device, a surface casing, a technical casing, an outer central tube and an inner central tube are sleeved at intervals from outside to inside in the well, and the surface casing and the technical casing can realize two times of well cementation; during exploitation, oil and a top guard are injected into an annular space between the technical sleeve and the outer central tube, and water or brine is alternately injected into or discharged from the outer central tube and the inner central tube; the device and the mining mode have the following problems: (1) only salt layers in a certain range around the outer central pipe can be dissolved, the brine yield is low, the recovery rate is low and is generally lower than 25%; (2) the well group and the cavity cannot be effectively protected and cultured, salt mine corrosion is caused to develop disorderly, and the cavity is communicated with the stratum fracture due to premature exposure and severe collapse of a top plate of a salt mine layer; (3) the vibration generated by the action of the water hammer during production and operation causes rigid collision between the central pipe and the technical casing, which easily causes phenomena of casing extrusion damage, corrosion perforation, groundwater pollution, brine leakage on the ground and the like.

Disclosure of Invention

The utility model aims at the above-mentioned not enough of prior art, the utility model provides a well salt water level well group oil blanket accuse is adopted device and technology, it has the wide advantage with the high comprehensive utilization ratio of dissolving chamber of solution range, can improve out steamed rate and recovery rate, and effective control halite side dissolves, realize that the bench layering is adopted steamed in order, prevent to block or reduce the crack passageway and take place, avoid the sleeve pipe to crowd simultaneously, corrode the groundwater pollution that the perforation arouses, ground emits the emergence of geological disasters such as steamed, reach the orderliness, the scientization, rationalization exploitation's purpose.

In order to achieve the purpose, the utility model discloses a well salt water level well group oil blanket accuse adopts device, including a vertical shaft, the vertical shaft is equipped with well head linkage, and well head linkage includes communicating pipe, associative nipple joint and tubing hanger, its characterized in that: the horizontal well comprises a straight well section, an inclination increasing section and a horizontal section, wherein the horizontal section is communicated with the straight well; the vertical well and the horizontal well are both sleeved with a surface casing, a technical casing and a central pipe at intervals from outside to inside, the central pipe is connected with a short section, and the technical casing is connected with a communicating pipe; the lower end of the central pipe of the horizontal well is arranged in the inclination increasing section of the horizontal well, and the lower end of the central pipe of the vertical well is lower than the lower end of the central pipe of the horizontal well.

The utility model can inject water and collect brine by alternately reversing the vertical well and the horizontal well, can dissolve and discharge brine in the salt layer between and around the two wells, has the advantages of wide dissolving range and high comprehensive utilization rate of the dissolving cavity, and can improve brine discharge rate and recovery rate; oil is injected into an annular space between the technical sleeves and the central pipe of the two wells, so that brine flows to four sides and dissolves a salt layer, the effect of controlling the dissolution is achieved, the top of the solution is protected, the solution cavity is effectively protected, and the crack channel is prevented from being blocked or reduced; when the salt layer between the two wells is dissolved to the utmost and the brine concentration is reduced, the two central pipes are lifted up to mine the salt layer of the previous bench, so that the sequential brine mining of the bench is realized, the purposes of ordered, scientific and reasonable mining are achieved, and the recovery rate can be improved;

As a further improvement of the utility model, a plurality of spring centralizers are sleeved outside the lower part of the central tube; the centralizer is used for elastic support and shock absorption, so that rigid collision between the central pipe and the technical casing is avoided, and geological disasters such as underground water pollution, surface brine emission and the like caused by casing crushing and corrosion perforation are avoided;

as a further improvement of the utility model, the central tube comprises a plurality of tube bodies and a plurality of couplings for connecting two adjacent tube bodies, and the spring centralizer is sleeved at the respective couplings; the spring centralizer is axially positioned by the coupling, so that the installation is convenient, and the axial and approximate uniform distribution can be realized;

To sum up, the utility model has the advantages of the wide and high solution cavity comprehensive utilization of dissolution scope can improve out steamed rate and recovery rate to effective control halite side is dissolved, realizes the ladder layering and adopts bittern in order, prevents to block or reduce the crack passageway and takes place, avoids simultaneously that the casing pipe is crowded to destroy, corrodes the groundwater pollution that the perforation arouses, ground to emit geological disasters such as bittern's emergence, reaches the purpose of orderly, scientific, rationalization exploitation.

Drawings

Fig. 1 is a front view of an embodiment of the present invention.

Fig. 2 is a schematic diagram of a salt layer later-stage dissolving cavity adopting the utility model.

FIG. 3 is a partial block diagram of the technical sleeve, spring centralizer and centertube of FIG. 1.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 and 3, the oil pad control device for a well and mine horizontal well group of the embodiment comprises a straight well 1 and a horizontal well, wherein the horizontal well comprises a straight well section 2, a deflection increasing section 3 and a horizontal section 4, and the horizontal section 4 is communicated with the straight well 1; the vertical well 1 and the horizontal well are both provided with well mouth suspension devices, each well mouth suspension device comprises a communicating pipe 5, a short section 6 and an oil pipe hanger 7, the communicating pipe 5 can adopt a three-way joint or a four-way joint, a surface casing pipe 8, a technical casing pipe 9 and a central pipe 10 are sleeved in the vertical well 1 at intervals from outside to inside, the central pipe 10 is connected with the short section 6, and the technical casing pipe 9 is connected with the communicating pipe 5; a surface casing 11, a technical casing 12 and a central pipe 13 are sleeved at intervals from outside to inside in the horizontal well, the central pipe 13 is connected with a short section of the central pipe, the technical casing 12 is connected with a communicating pipe of the technical casing, the lower end of the central pipe 13 is arranged in the inclination-increasing section 3 of the central pipe, and the lower end of a central pipe 10 of the vertical well is lower than the lower end of the central pipe 13 of the horizontal well; the two central tubes 10 and 13 respectively comprise a plurality of tube bodies 14 and a plurality of couplings 15 for connecting the two adjacent tube bodies 14, and the spring centralizers 16 are sleeved at the plurality of couplings 15 at the lower parts of the two central tubes 10 and 13.

The utility model discloses a use as follows: A) initial positive cycle brine collection: two technical casings 9 and 12 are put into the upper part of a salt layer 17, and a central tube 10 in a vertical well 1 is put above a bottom plate of the salt layer 17; injecting water under pressure into a central pipe 10 of a vertical well 1 by a liquid pump (not shown), dissolving mineral salts, and then discharging brine from a central pipe 13 of a horizontal well in a positive circulation mode to carry out brine production, after a dissolving cavity is formed around the lower end of the central pipe 10 in the vertical well 1 for a period of time, injecting crude oil and protecting a top through an oil pump (not shown) and an annular space between a technical sleeve 12 and the central pipe 13 by a communicating pipe 5 of the vertical well, wherein the oil injection pressure is higher than the water injection pressure; B) initial reverse circulation bittern collection: injecting water under pressure into a central pipe 13 of the horizontal well by a liquid pump, dissolving mineral salts, and then discharging brine from the central pipe 10 of the vertical well 1 in a reverse circulation mode to carry out brine production, after a solution cavity is formed around the lower end of the central pipe 13 in the horizontal well for a period of time, injecting crude oil and protecting a top into an annular space between a technical casing 12 and the central pipe 13 by the oil pump through a communicating pipe of the horizontal well, wherein the oil injection pressure is higher than the water injection pressure; c) And (3) pouring well to recover brine: after a period of production, the well is poured and brine is extracted once, namely the two central pipes 13 and 10 are alternately switched between water injection and brine discharge, and a proper amount of oil is injected into the annular space between the technical casing and the central pipe of the original water injection well before switching to timely supplement the oil; the supplement amount can be determined by controlling the mining height of the underground dissolving cavities of the two wells and the size of the dissolving cavities in the early stage; the brine extraction parameters and the height of the central pipe in the production operation can be adjusted according to overhigh or overlow brine outlet concentration; D) when the brine outlet flow is reduced, the brine concentration is still reduced, as shown in fig. 2, which indicates that the salt layer of the current bench is basically dissolved completely to form a later-stage dissolving cavity 18, pressure relief and oil drainage are performed through an oil pump, the two central pipes 10 and 13 are lifted up by the respective oil pipe hangers 7, and the steps A, B and C are repeated to perform salt dissolving exploitation on the salt layer of the previous bench; after each two bench mining, the cavity is measured by sound waves or sonar, the size, shape and corrosion height of the underground cavity are found out, if the corrosion height is too large, the two central pipes 10 and 13 are lowered, oil is supplemented to the annular space outside the two central pipes, and then the bench salt layer is mined; the comprehensive utilization rate and the recovery rate of the dissolving cavity can be ensured; setting sedimentation detection points in the range of the two solution cavity areas in the middle and later periods of mining; the occurrence of geological disasters such as collapse can be prevented;

The utility model can inject water and collect brine by alternately reversing the vertical well and the horizontal well, can dissolve and discharge brine in the salt layer between and around the two wells, has the advantages of wide dissolving range and high comprehensive utilization rate of the dissolving cavity, and can improve brine discharge rate and recovery rate; oil liquid is injected into the annular space between the technical casing 9 and the central pipe 10 of the vertical well 1 and the annular space between the technical casing 12 and the central pipe 13 of the horizontal well, so that brine flows to four sides and dissolves a salt layer, the effect of controlling the dissolution is achieved, the top of a dissolution cavity is prevented from being dissolved too fast, the dissolution top is protected, the dissolution cavity is effectively protected, and the occurrence of fracture channels is prevented from being blocked or reduced; when the salt layer of the same bench between two wells is dissolved to the utmost and the brine concentration is reduced, the two central pipes 10 and 13 are lifted to collect brine from the salt layer of the previous bench, thus realizing the layered and ordered mining of the bench, achieving the purposes of ordered, scientific and reasonable mining and improving the recovery rate; the elastic support of the centralizer 16 is used for damping, so that rigid collision between the central pipe and the technical casing is avoided, and geological disasters such as underground water pollution, surface brine emission and the like caused by casing crushing and corrosion perforation are avoided; the spring centralizers 16 are axially positioned by the coupling 15, so that the installation is convenient, and the axial uniform distribution can be realized.

Claims

1. the utility model provides a well mineral salt level well group oil blanket accuse adopts device, includes a vertical shaft, and the vertical shaft is equipped with well head linkage, and well head linkage includes communicating pipe, associative nipple joint and tubing hanger, its characterized in that: the horizontal well comprises a straight well section, an inclination increasing section and a horizontal section, wherein the horizontal section is communicated with the straight well; the vertical well and the horizontal well are both sleeved with a surface casing, a technical casing and a central pipe at intervals from outside to inside, the central pipe is connected with a short section, and the technical casing is connected with a communicating pipe; the lower end of the central pipe of the horizontal well is arranged in the inclination increasing section of the horizontal well, and the lower end of the central pipe of the vertical well is lower than the lower end of the central pipe of the horizontal well.

2. the well brine level well group oil pad controlled recovery device of claim 1, wherein: the lower part of the central tube is sleeved with a plurality of spring centralizers.

3. The well brine level well group oil pad controlled recovery device of claim 2, wherein: the central tube comprises a plurality of tube bodies and a plurality of couplings for connecting two adjacent tube bodies, and the spring centralizer is sleeved at each coupling.