CN102536302A - Method for relieving pressure and eliminating outburst of ground butting well - Google Patents

Abstract

The invention relates to the field of coal-bed gas and safety production of coal mine, particularly to a method for relieving pressure and eliminating outburst of a ground butting well for downward putting a continuous oil pipe through the ground butting well for hydraulically spraying coal bodies so as to relieve original pressure of a coal bed, enhance the air permeability of the coal bed, eliminate the outburst danger of downhole coals and gas, and increase the yield of the coal bed. The aim of the invention is to overcome defects in the prior art and provide a method for relieving pressure and eliminating outburst of the ground butting well, which is capable of enhancing the air permeability of the coal bed, eliminating the gas pressure of the coal bed, controlling the outburst danger of the coals and the gas, and increasing the yield of the coal bed by aiming at the conventional condition of difficulty in increasing the air permeability, relieving the pressure and eliminating the outburst in the coal bed of a development region of construction coals. According to the invention, continuous oil pipe operation and hydraulic spray operation can be carried out from a ground horizontal well; coal powder and water can be eliminated from a vertical well; intraformational pressure relief is carried out on downhole coal bodies from ground control operation; the coal bodies are liberated; and the purposes of relieving the pressure and eliminating the outburst are finally achieved; in the executing process of the operation, the coal bodies are subject to large-area pressure relief and outburst elimination directly from a ground drilling well; operators are prevented from facing outburst coal bodies in a close distance downhole; the personal safety of workers is ensured; and the method provided by the invention is an intrinsic safety type method.

Description

A kind of ground butt shaft release extinction method

Technical field

The present invention relates to coal bed gas and Safety of Coal Mine Production field; Be particularly related to and a kind ofly be lowered to coiled tubing through the ground butt shaft; Coal body is carried out jetting; Thereby removal coal seam reset pressure improves gas permeability of coal seam, eliminates down-hole coal and gas outburst risk, improves the ground butt shaft release extinction method of methane output.

Background technology

China's most of mining area structure coal is relatively grown, and it is soft that its regional coal seam has ature of coal, the gas permeability of coal seam difference with have characteristic such as high watt gas, the structure coal grows regional gas control and cbm development is the global problem of generally acknowledging.At present; Gas control is mainly through two means: the one, reduce reservoir pressure, and cause desorption of mash gas, seepage flow output under the effect of pressure reduction; As: ground drilling drainage and step-down gas producing technology and the down-hole drilling negative pressure technology that draws out methane; But effectively the large tracts of land release is anti-reflection from the zone of the straight well of ground extraction gas and horizontal well soft, the hypotonic and high gas of ature of coal in the coal seam for tradition; Another is through the original pressure-bearing of disturbance coal seam; Make the stress release space, coal mesopore (splitting) crack is increased on a large scale, reduce adsorption gas pressure-bearing fast desorption; Enlarge gas seepage flow output passage simultaneously, as: pressure-relief outburst-prevention measure in the layer such as topping production technique and hydraulic loose.The topping production technique is one of the most effective regional protrusion-dispelling technology, but it is limited by geological conditions, generally is applied in the mine of coal seam group mining, and single coal seam and the bigger coal seam of interlamellar spacing are not suitable for; Hydraulic loose is the anti-reflection outburst prevention measures of release in a kind of layer, in the hyposmosis coal body, has played certain effect, but in the process of implementation, often exists that gas exceeding limit is frequent, Yi Renwei induces problems such as outstanding, can not carry out regional release.

Summary of the invention

The objective of the invention is to overcome the deficiency that exists in the prior art and provide a kind of to the structure coal grow that regional coal-seam is anti-reflection, the present situation of release, extinction difficulty, can improve that coal body gas permeability, removal coal-bed gas pressure, control coal are outstanding with gas, the ground butt shaft release extinction method of raising coal bed gas gas production.

For realizing above-mentioned purpose, the present invention adopts following technical scheme:

A kind of ground butt shaft release extinction method is characterized in that: operation as follows:

Step 1), set up peupendicular hole, be used to arrange coal dust, water and coal bed gas and collect coal-water mixture, and gas producing device, the coal bed gas of gathering are installed; This peupendicular hole is lowered to sleeve pipe peupendicular hole is reinforced by below the earth drilling coal seam, and the mode in cave or aerodynamic cave of making through machinery is drawn the cave to the coal body on every side in the coal seam, in the coal seam, forms the cave of diameter >=1.5m;

Step 2), set up horizontal well; Be used for docking with peupendicular hole is directed; Coiled tubing and spraying operation instrument carried out spraying operation in dependence was lowered to; This well creeps into the certain position place downward vertically by ground and begins deflecting; The angle of inclination based in the design between peupendicular hole and the horizontal well intersection of distance, peupendicular hole slanting section position and horizontal well and coal seam section promptly land a little the position and decide, landing a little in two spudding wells to coal seam, creeps into along the coal seam; Dock with peupendicular hole, be lowered to sleeve pipe horizontal well is reinforced;

Step 3), at horizontal well head; Set up and spray well head, be lowered to coiled tubing, high-pressure hose, jet bit respectively, open high pressure water-injection pump and carry out vectored injection; The single hole spray penetration is by seam inclination; The azimuth decision in trend and each hole is return coiled tubing and jet bit, throw angle to orientation, next hole; Continuing turn on pump sprays; Carry out this measure repeatedly, accomplish the design hole count until spraying, the design hole count is decided based on the needs of coal seam thickness, inclination angle and release;

Step 4), pass through peupendicular hole discharge coal dust and water, the coal bed gas of gathering simultaneously.

The present invention reaches and unloads the coal output layer reset pressure through horizontal butt shaft coiled tubing jetting coal body, improves gas permeability of coal seam, increases the coal bed gas row amount of adopting, control coal and the outstanding purpose of gas.Through implementing the coiled tubing operation from surface water horizontal well, the jetting operation, peupendicular hole is got rid of coal dust and water, has from the Ground Control operation down-hole coal body is carried out the interior release of layer, has liberated coal body, finally reaches the purpose of release extinction.In the operation implementation process, directly coal body is carried out large tracts of land release extinction, avoided operating personnel closely to face outstanding coal body in the down-hole, guaranteed operating personnel's personal safety, be the essential safe type method from ground drilling.

Description of drawings

Fig. 1: the sketch map that adopts the method for the directed butt shaft jetting of the present invention release extinction.

Fig. 2: directed butt shaft jetting boring effect sketch map.

The specific embodiment

A kind of ground butt shaft release extinction method is characterized in that: operation as follows:

Step 1), set up peupendicular hole 1, be used to arrange coal dust, water and coal bed gas and collect coal-water mixture, and gas producing device, the coal bed gas of gathering are installed; This peupendicular hole 1, is lowered to 3 pairs of peupendicular holes 1 of sleeve pipe and reinforces below 2 by the earth drilling coal seam, and the mode in cave or aerodynamic cave of making through machinery is drawn the cave to the coal body on every side in the coal seam 2, in the coal seam, forms the cave 4 of diameter >=1.5m;

Step 2), set up horizontal well 5; Be used for and peupendicular hole 1 directed the butt joint; Coiled tubing 8 carried out spraying operation with the spraying operation instrument in dependence was lowered to; This well creeps into the certain position place downward vertically by ground and begins deflecting; The angle of inclination based in the design between peupendicular hole 1 and the horizontal well 5 distance, peupendicular hole 1 slanting section position and horizontal well 5 and the intersection of coal seam section promptly land a little 6 position and decide; Point 6 lands in two spudding wells to coal seam; 2 creep into along the coal seam; Dock with peupendicular hole 1, be lowered to 7 pairs of horizontal wells 5 of sleeve pipe and reinforce;

Step 3), at horizontal well head, set up to spray well head, be lowered to coiled tubing 8, high-pressure hose 9, jet bit 10 respectively; Open high pressure water-injection pump and carry out vectored injection, the single hole spray penetration is by seam inclination, the azimuth decision in trend and each hole; Return coiled tubing 8 and jet bit 10; Throw angle to orientation, next hole continues turn on pump and sprays, and carries out this measure repeatedly; Accomplish the design hole count until spraying, the design hole count is decided according to the needs of coal seam 2 thickness, inclination angle and release;

Step 4), pass through peupendicular hole 1 discharge coal dust and water, the coal bed gas of gathering simultaneously.

The present invention reaches and unloads the coal output layer reset pressure through horizontal butt shaft coiled tubing jetting coal body, improves gas permeability of coal seam, increases the coal bed gas row amount of adopting, control coal and the outstanding purpose of gas.

Claims (1)

1. ground butt shaft release extinction method is characterized in that: operation as follows:

Step 1), set up peupendicular hole, be used to arrange coal dust, water and coal bed gas and collect coal-water mixture, and gas producing device, the coal bed gas of gathering are installed; This peupendicular hole is lowered to sleeve pipe peupendicular hole is reinforced by below the earth drilling coal seam, and the mode in cave or aerodynamic cave of making through machinery is drawn the cave to the coal body on every side in the coal seam, in the coal seam, forms the cave of diameter >=1.5m;

Step 2), set up horizontal well; Be used for docking with peupendicular hole is directed; Coiled tubing and spraying operation instrument carried out spraying operation in dependence was lowered to; This well creeps into the certain position place downward vertically by ground and begins deflecting; The angle of inclination based in the design between peupendicular hole and the horizontal well intersection of distance, peupendicular hole slanting section position and horizontal well and coal seam section promptly land a little the position and decide, landing a little in two spudding wells to coal seam, creeps into along the coal seam; Dock with peupendicular hole, be lowered to sleeve pipe horizontal well is reinforced;

Step 3), at horizontal well head; Set up and spray well head, be lowered to coiled tubing, high-pressure hose, jet bit respectively, open high pressure water-injection pump and carry out vectored injection; The single hole spray penetration is by seam inclination; The azimuth decision in trend and each hole is return coiled tubing and jet bit, throw angle to orientation, next hole; Continuing turn on pump sprays; Carry out this measure repeatedly, accomplish the design hole count until spraying, the design hole count is decided based on the needs of coal seam thickness, inclination angle and release;

Step 4), pass through peupendicular hole discharge coal dust and water, the coal bed gas of gathering simultaneously.

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