CN104895546A

CN104895546A - Natural gas hydrate seabed separation technology based on solid state fluidization exploitation

Info

Publication number: CN104895546A
Application number: CN201510189306.0A
Authority: CN
Inventors: 陈浩; 吴定定; 顾元国; 吕斌; 黄俊铭
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2015-04-21
Filing date: 2015-04-21
Publication date: 2015-09-09

Abstract

The invention relates to a natural gas hydrate seabed separation technology based on solid state fluidization exploitation and the technology can be especially applied to solid state fluidization exploitation of non-diagenetic natural gas hydrate on a shallow surface layer of the seabed. The technology comprises the following steps of conveying hydrate primary pulp pumped out after exploitation by a seabed mining machine to a seabed sieving device for sieving processing, conveying large solid particles after the sieving process to a seabed smashing device for smashing processing, sieving hydrate mixture after the smashing process, separating small and large solid particles after the sieving process, and backfilling mud achieved after the separation into the seabed. Hydrate separation on the seabed can be achieved during non-diagenetic natural gas hydrate solid state fluidization exploitation on the shallow surface layer of the seabed; the whole process is safe and high efficient; and hydrate content in the mud after the separation can be effectively controlled.

Description

A kind of gas hydrates seabed separating technology based on solid state fluidizing exploitation

Technical field

The present invention relates to a kind of gas hydrates seabed separating technology based on solid state fluidizing exploitation, be particularly useful for the exploitation of sea-bottom surface non-diagenesis gas hydrates solid state fluidizing, belong to sea bed gas hydrate and develop field.

Background technology

Exploitation with landing field petroleum resources can not meet the requirement of people, and the development trend of the exploitation of Marine oil and gas resource, gas hydrates not still world energy sources is also the strategic objective of Energy Development in China.Gas hydrates are as the clean energy resource having potential quality, large with its reserves, energy density is large and widespread feature, and what be counted as 21 century most potentiality takes over the energy.

China successfully obtained Gas Hydrate In Sea Areas sample respectively in 2007,2013, and preliminary delineation 11 distant view resource-areas, Prospective resources reaches 68,000,000,000 tons of oil equivalents, is 1/2 of China's oil gas reserves.But the Gas Hydrate In Sea Areas sample that China has obtained mainly is distributed in northern continental slope of the South China Sea, buried depth several meters in the mud stone of about 300 meters or weak cementing rock, mostly there is no trap structure stable as conventional gas and oil is hidden, the simultaneously important component part of gas hydrates inherently rock skeletal structure, in the shallow seated groundwater compound recovery process of ocean, its original solid-state structure, by defeated and dispersed, uses conventional mining type to be difficult to realize the exploitation of China's sea bed gas hydrate Tibetan.The exploitation of gas hydrates solid state fluidizing is adopted to be a kind of effective method.The method can realize green to the non-diagenesis gas hydrates of sea-bottom shallow, environmental protection and safe working.

Due to the implementation of solid state fluidizing mining type is solid-state mining, and the hydrate mixture phase formed is complicated, comprises the Multiple components such as the adhesive bond of natural gas, water, hydrate particle, silt and hydrate and silt.Existing isolation technics is difficult to realize hydrate and sand grain being thoroughly separated in seabed.Therefore, need the isolation technics of a kind of efficient, environmental protection and safety, realize the separation to hydrate.

Summary of the invention

The object of the invention is the deficiency existed for prior art, a kind of gas hydrates seabed separating technology based on solid state fluidizing exploitation is proposed, be applicable to realize in gas hydrates solid state fluidizing recovery process the separating technology that hydrate seabed is efficiently separated, to overcome the defect existed in existing technology.

The scheme that the present invention solves the problems of the technologies described above is:

A kind of gas hydrates seabed separating technology based on solid state fluidizing exploitation of the present invention, comprises the following steps: the hydrate magma 1. pumping after the exploitation of ocean-mine machine come is delivered to seabed screening plant and carries out screening process; 2. the large solid particle obtained after screening process is delivered to seabed breaker and carries out break process; 3. the hydrate mixture after break process is carried out again screening process, sub-elect larger solid particle mixture, according to actual conditions may need multistage repeatedly fragmentation, screening are carried out to larger particles; 4. respectively separating treatment is carried out to the large and small solid particle mixture after screening process, obtain impure less hydrate mixture; 5. carry out seabed backfill to being separated the silt that obtains, the less hydrate mixture of impurity is delivered to surface facility and is for further processing.

Beneficial effect of the present invention is: the principle that the present invention utilizes classification to be separated; by screening-broken-screening process; by large and small solid particle mixture classification, then respectively by separation equipment, the separation of sea bottom hydrate relatively easily and efficiently can be realized.By the control to hemihydrate content in silt after separation, and then control hydrate to the impact of environment.The whole process safety of the present invention, efficient, and effectively can control the content being separated hydrate in rear silt, prevent from entering marine hydrate and produce natural gas because decompose and environment is worked the mischief.In addition, the present invention can alleviate standpipe conveying capacity, reduce lifting power consumption, thus improves recovery ratio; Effectively can also save the production space of offshore production platform simultaneously, thus reduce running cost.The seabed that can realize hydrate in sea-bottom surface non-diagenesis gas hydrates solid state fluidizing recovery process is separated.

Accompanying drawing explanation

Fig. 1 is the process chart of a kind of gas hydrates seabed separating technology based on solid state fluidizing exploitation of the present invention.

Detailed description of the invention

Further illustrate the present invention below in conjunction with accompanying drawing: as shown in Figure 1, a kind of gas hydrates seabed separating technology based on solid state fluidizing exploitation of the present invention, comprises the following steps:

1. the gas hydrates magma that the digging of ocean-mine machine comes through pumping is delivered to seabed screening plant and carries out screening process, sub-elect large solid particle.

2. the large solid particle obtained through screening process sorting is delivered to seabed breaker and carries out break process, obtain the hydrate mixture of ideal form, size on request.

3. the hydrate mixture through break process is processed through screening plant screening again.

4. being separated respectively being separated the mixture obtained after each classification, obtaining impure less gas hydrates mixture.Because the shape of mixture, size difference are not too large, effective separation can be realized to hydrate.

5. carrying out seabed backfill by being separated the silt obtained, being delivered to being separated the impure less hydrate mixture obtained the process that surface facility carries out next step.

Whole separation process utilizes classification separation principle, can realize the efficient separation of gas hydrates.

Claims

1. based on a gas hydrates seabed separating technology for solid state fluidizing exploitation, it is characterized in that, comprise the following steps: the hydrate magma 1. the collection pumping of ocean-mine machine come is delivered to seabed screening plant and carries out screening process; 2. the large solid particle obtained after screening process is delivered to seabed breaker and carries out break process; 3. the hydrate mixture after break process is carried out again screening process, sub-elect larger solid particle mixture; 4. respectively separating treatment is carried out to the large and small solid particle mixture after screening process, obtain impure less hydrate mixture; 5. carry out seabed backfill to being separated the silt that obtains, the less hydrate mixture of impurity is delivered to surface facility and is for further processing.

2. a kind of gas hydrates seabed separating technology based on solid state fluidizing exploitation according to claim 1, it is characterized in that, whole separation process utilizes classification separation principle, can realize the efficient separation of gas hydrates.