CN103573184A

CN103573184A - Solid foam well drilling method

Info

Publication number: CN103573184A
Application number: CN201210273950.2A
Authority: CN
Inventors: 唐波; 冯光通; 唐洪林; 耿应春; 刘新华; 牛洪波
Original assignee: China Petroleum and Chemical Corp; Drilling Technology Research Institute of Sinopec Shengli Petroleum Administration Bureau
Current assignee: China Petroleum and Chemical Corp; Drilling Technology Research Institute of Sinopec Shengli Petroleum Administration Bureau
Priority date: 2012-08-03
Filing date: 2012-08-03
Publication date: 2014-02-12

Abstract

The invention relates to a solid foam well drilling method matched with a gas well drilling technology. According to the method, on the basis of the conventional gas well drilling equipment, an auxiliary material adding device and a recovery system are added. The process method mainly comprises the following steps that the gas is pressurized and is then filled into a well, and in addition, well drilling is started; solid foam is added into the pressurizing gas through the auxiliary material adding device; the solid foam enters the well along with the pressurized gas and absorbs formation water; the water absorption solid foam returns the ground through annulus parts; and a recovery system is used for recovering and utilizing the solid foam. The process method has the advantages that the consumption of the solid foam is low, the recovery is convenient, the equipment process is simple, the integrated cost is low, the problem of insufficient gas well drilling water carrying capability is solved, the application range of the gas well drilling is expanded, and a new method is provided for the speed acceleration and the efficiency improvement of the well drilling engineering.

Description

Solid foam boring method

Technical field

The present invention relates to oil and natural gas drilling technology, particularly a kind of solid foam boring method that coordinates air drilling.

Background technology

Because air drilling raising bit speed is obvious; reservoir protection is effective; and integrated drilling cost is low; therefore in petroleum drilling engineering, be widely applied; but gas to take outlet capacity very limited; once stratum water outlet, make air drilling just be difficult to bring into play its technical advantage, air drilling application is subject to great restriction.For what improve gas drilling, take water-based energy, engineers and technicians are successively developed and have been applied atomization, foam drilling technology, but taking water-based and still can not solving stratum completely and go out water problems of atomization and foam, when stratum water yield is larger, still has to be converted into drilling fluid drilling well.

The water imbibition of some solid materials is very strong, particularly along with the development of solid material science and technology, some synthesis of solid material water imbibition amount is stronger, its water absorption even can reach hundreds and thousands of times of original volume, takes water problems a kind of new scheme is provided: solid foam well-drilling technology for solution gas drilling.Its feasibility major embodiment in:

(1) have lowlyer compared with the density of the solid material of strong absorptive own, after water suction, its density is still less than cuttings density, and air-flow is carried the solid material after water suction outside pit shaft, and to return to ground comparatively easy;

(2) after some water imbibition solid material water suctions, be to remove adsorbed water by centrifugal, furnace drying method, material can reuse, and reduces solid foam drilling technology cost, has stronger promotional value.

In view of all boring chance water layer at a lot of oil gas fields, outlet capacity deficiency is taken in current gas/atomization/foam drilling, needs badly a kind of gas drilling process of taking very greatly outlet capacity that has is provided.

Summary of the invention

Object of the present invention is exactly the problem of shipwreck of taking for solving gas drilling, and a kind of solid foam well-drilling technology that utilizes solid material absorption formation water is provided.

Technical scheme of the present invention: on conventional gas drilling technology basis, solid foam is joined in pressurization gas, described solid foam is the lightweight solid particle material having compared with strong absorptive.

In described method, also comprise and use recovery system to recycle solid foam.

It is to add in high-pressure aerated pipeline by adjuvant adding device that solid foam joins pressurization gas, and adjuvant adding device is with batchmeter; Described recovery system is comprised of sediment outflow pond, service sink, dewater unit and drying unit.In described service sink, be provided with agitator.

Described recovery system recycles step and comprises: (1) is returned in the sediment outflow pond that ground solid foam is all discharged into water-filling, initial gross separation solid foam and landwaste; (2) solid foam of initial gross separation enters service sink, and under mechanical agitation, further separation is attached to the landwaste of solid foam; (3) solid foam after service sink cleans enters dewater unit dehydration; (4) solid foam after dehydration enters drying unit oven dry.

By means of the present invention, can realize following beneficial effect:

(1) solid foam consumption is few, recovery is convenient, apparatus and process is simple, and integrated cost is low;

(2) solved the problem that gas drilling is taken outlet capacity deficiency;

(3) widened gas drilling range of application, for drilling engineering, put forward effect new method is provided.

Accompanying drawing explanation

Fig. 1 is the layout schematic diagram of the concrete application of solid foam boring method of the present invention.

In figure, 1. gas drilling wellsite facility, 2. auxiliary adding set, 3. sediment outflow pond, 4. service sink, 5. dewater unit, 6. drying unit;

Fig. 2 is solid foam boring method idiographic flow schematic diagram of the present invention.

The specific embodiment

Now in conjunction with Fig. 1, Fig. 2, the present invention will be further described.Solid foam boring method is mainly: the air-flow by gas drilling is brought the solid foam (as starch grafted acrylate polymer or acrylamide copolymer) having compared with strong absorptive in shaft bottom, after solid foam absorbs water in pit shaft, by gas, carry and return to ground, by cleaning, dewater and drying, this solid foam can be reused.

As shown in Figure 1, with respect to conventional gas drilling well, this technique need increase auxiliary adding set 2 at the pipeline rear side that increases gas to solid foam boring method site layout project, and increases service sink 4, dewater unit 5 and drying unit 6 near sediment outflow pond 3.

Solid foam drilling technology flow process as shown in Figure 2.

The solid foam boring method according to the present invention, comprises the following steps:

(1) will after gas boosting, be injected in well, and start to creep into;

(2) by adjuvant adding device, solid foam is added in pressurization gas;

(3) solid foam enters well with pressurization gas, and adsorbs formation water;

(4) water suction solid foam returns to ground by annular space;

(5) by recovery system, solid foam is recycled.

Described solid foam well-drilling technology, need, on conventional gas drilling equipment 1 basis, increase adjuvant adding device 2, service sink 3, dewater unit 4 and drying unit 5.

In described step (2), selected solid foam is the lightweight solid particle material having compared with strong absorptive, and adjuvant adding device 2 can be controlled solid foam addition.

In described step (4), the landwaste, the water suction solid foam that return to ground are all discharged in sediment outflow pond.

In described step (5), solid foam reclaims system and is comprised of sediment outflow pond, service sink 3, dewater unit 4 and drying unit 5.

Described sediment outflow pond should be full of certain water, and the solid foam that makes to absorb water floats on the water surface.

Clear water and mechanical agitator are housed in described service sink, remove the attached landwaste of doing in water suction solid foam.

Described dewater unit 4 drying units 5 are removed the water in water suction solid foam, and solid foam can be reused.

During concrete application, once find that stratum water yield has reached, cannot adopt gas realization to take water, according to stratum water yield, select required water imbibition solid foam and optimize material parameter, for example material particle size is big or small, addition, selected solid should meet with following some requirement: (1) solid foam water suction rear surface intensity is good, after avoiding occurring solid foam water suction, attached work in, on the borehole wall or drilling tool, caused down-hole risk; (2) after the water suction of solid foam, expand and be difficult for excessively, after avoiding absorbing water, expanding volume is excessive; (3) particle diameter of solid foam is difficult for excessively, avoids stopping up drilling tool; (4) selection of solid foam should be compatible with formation water, to improve its absorption speed; (5) solid foam addition should match with the water absorbing capacity of stratum water yield, material.

Solid foam adds high-pressure aerated pipeline by adjuvant adding device 2, and enters pit shaft with pipeline air-flow, and wherein adjuvant adding device 2 has the addition of adjusting function, to regulate solid foam addition according to the situation of stratum water yield at any time.

Solid foam enters in pit shaft by drill bit, absorption formation water, by high velocity air, carry out well head, if stop gas injection while making up a joint (as), should first stop adding solid foam, and gas injection circulation certain hour, to prevent that the solid foam after a large amount of water suctions stagnates in pit shaft, cause down-hole risk.

Water suction solid foam enters sediment outflow pond with air-flow, and gas will discharge or burn, and the sediment outflow pond that is filled with certain water gaging is suspended in surface by solid foam, employing manually or mechanical means salvaged, and drop into cleaning in service sink 4.For improving cleaning efficiency, can in service sink 4, increase mechanical stirring device.After cleaning, pour water suction solid foam in dewater unit 5 dehydration, finally in drying unit 6, dry, solid foam recovers its water imbibition, and recycling, reduces costs protection of the environment.

Claims

1. solid foam boring method, is characterized in that: on conventional gas drilling technology basis, solid foam is joined in pressurization gas, described solid foam is the lightweight solid particle material having compared with strong absorptive.

2. solid foam boring method according to claim 1, is characterized in that: in described method, also comprise and use recovery system to recycle solid foam.

3. solid foam boring method according to claim 2, it is characterized in that: it is to add in high-pressure aerated pipeline by adjuvant adding device that solid foam joins pressurization gas, adjuvant adding device is with batchmeter, and described recovery system is comprised of sediment outflow pond, service sink, dewater unit and drying unit.

4. solid foam boring method according to claim 3, is characterized in that: in described service sink, be provided with agitator.

5. solid foam boring method according to claim 4, is characterized in that: described recovery system recycles step and comprises:

(1) return in the sediment outflow pond that ground solid foam is all discharged into water-filling initial gross separation solid foam and landwaste;

(2) solid foam of initial gross separation enters service sink, and under mechanical agitation, further separation is attached to the landwaste of solid foam;

(3) solid foam after service sink cleans enters dewater unit dehydration;

(4) solid foam after dehydration enters drying unit oven dry.