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Low permeability oil and gas + scientific and technological breakthrough = efficient development

-- Research Notes of the national major scientific and technological project "drilling technology for efficient development of low permeability oil and gas fields"

in early May, the drilling Institute of Shengli Oilfield learned that 248 researchers and managers who participated in the major project included engineering and technical personnel who were proficient in field construction, professors and doctors with profound professional theories, as well as many young scientific research backbones, There are also old experts in related fields

over the past two years, they have carried out 17 special technical research projects, 62 special technical research, introduced, supported and independently developed 16 new tools and instruments, developed and introduced 8 sets of indoor test devices, developed 5 sets of new drilling and completion fluid systems, and carried out field tests and applications of new tools, new products and new technologies for 107 wells around 6 topics of efficient development of drilling technology in low permeability oil and gas fields, During the research, 7422 groups (Times) of indoor experiments were carried out

the national major scientific and technological project "drilling technology for efficient development of low permeability oil and gas fields" produced a beautiful answer in the closing year of the eleventh five year plan

According to the China news service, Jinan, May 4, Shengli Oilfield, China's second largest oilfield, has actively developed low-permeability reservoir development technology and made important progress and major technological breakthroughs to ensure the sustainable and stable production of the oilfield

it is reported that Shengli Oilfield has planned the development of low permeability reservoirs relying on this new technical support. According to this plan, from 2012 to 2014, Shengli Oilfield will strengthen the adjustment of old areas for low-permeability reservoirs, and maintain 170 new wells every year; The new area will strengthen the evaluation of reserves, invest 30million to 35million tons of reserves, and build 340000 tons of new capacity. On this basis, the production of low permeability reservoirs will continue to rise steadily, reaching more than 4.5 million tons by 2015

it is reported that among the reserves that have been used in Shengli Oilfield, the average recovery factor is 28%, while that of low-permeability reservoirs is only 18%. There is at least 10 percentage points of room for improvement from the average level in terms of recovery factor. Judging from the newly increased proved reserves every year, the proportion of low-permeability reservoirs is increasing. The report pointed out that in order to maintain stable production, Shengli Oilfield must solve the effective development of low-permeability reservoirs

background it is an indisputable fact that low permeability reservoirs have become an important reservoir increase position in Shengli Oilfield. Since the Eighth Five Year Plan period, the annual newly added proved reserves have been around 20million tons, especially during the Eleventh Five Year Plan period, the average annual proved reserves were 52.5 million tons, accounting for half of the proved reserves in that year. By the end of 2009, the proved reserves of low permeability reservoirs in Shengli Oilfield had reached 944 million tons

however, low permeability reservoirs are often "unable to inject water and produce oil" due to their tight reservoirs, which is an international problem perplexing the oil industry. In addition, the low-permeability reservoir in Shengli Oilfield is deeply buried, with low reserves abundance and high formation pressure, which paves the way for more difficulties in tackling key problems of low-permeability reservoir in Shengli Oilfield

starting with the basic research of seepage mechanism, in-situ stress field and fracture distribution law, Shengli people have gradually overcome the supporting technologies such as well spacing optimization, overall fracturing transformation and reservoir protection, especially the low-permeability transformation technology is becoming more and more mature, from the optimization of single well transformation technology to the overall fracturing development of the block, from a single guanidine gum fracturing fluid system to a variety of low damage transformation working fluids, It ensures the effective production of various complex types of low permeability reservoirs

since the "Eleventh Five Year Plan", the newly produced reserves of low-permeability reservoirs have increased by 100 million tons, and the output of low-permeability reservoirs has increased year by year, with an annual oil output of 3.86 million tons in 2009

important breakthroughs have been made in technical research

recently, the drilling technology for the efficient development of low permeability oil and gas fields, a major national science and technology project, passed the stage inspection organized by the National Energy Administration in Beijing and was highly praised by experts from the engineering technology team

over the past two years, the project researchers have made efforts to carry out 107 field tests and made 6 major technological advances, achieving 14 major technological breakthroughs, including high-level branch well drilling and completion technology, horizontal well and staged fracturing horizontal well design, low-permeability oil and gas reservoir productivity prediction technology breakthrough, and developing high-temperature and high-pressure MWD measuring instruments, special-shaped extended tooth PDC bit series products 13 series of equipment and products, including the supporting equipment for the whole process of underbalanced drilling, have obtained 6 utility model patents, applied for 14 invention patents, and created 2 new domestic petroleum engineering records, 5 new Sinopec petroleum engineering records, and 8 new block records

this time, the National Energy Administration organized group inspection of the achievements of major national science and technology special projects and demonstration projects. Among them, the engineering technology group was responsible for reviewing the project because these high molecular chains were naturally curled in the toothpaste tube. Academician Luo pingya served as the leader of the expert group. Experts from PetroChina, Sinopec, CNOOC and some petroleum universities are members of the expert group. The experts at the meeting spoke highly of the completion and achievements of the project, and put forward suggestions for the follow-up study of the "Eleventh Five Year Plan" of the project. After the successful completion of the project, it will provide engineering and technical support for the efficient development of low permeability oil and gas fields in China, which is of great significance for further improving the development of low permeability oil and gas fields and difficult to use reserves, and ensuring national energy security

background drilling technology for efficient development of low permeability oil and gas fields is a research project to carry out drilling design, drilling technology, reservoir protection, completion technology and other drilling supporting technologies according to the characteristics of low permeability oil and gas reservoirs. Its ultimate goal is to improve the development efficiency of low permeability oil and gas fields

since its implementation, through careful organization and technical breakthrough, the project has been operated according to the contract plan. In terms of the research on the high-efficiency development and drilling optimization technology of low-permeability oil and gas fields, the drilling supporting technology of complex structure wells, the drilling technology of maximizing the effective footage of reservoirs, the reservoir protection technology of low-permeability oil and gas fields, the key technology of high-efficiency drilling in special complex formations of low-permeability gas reservoirs, and the key technology of completion of low-permeability oil and gas fields, Have made a series of remarkable progress and breakthroughs. At present, 42 relevant academic papers have been published, 6 utility model patents have been obtained, and 10 invention patents have been applied for

field tests have achieved remarkable results

107 field tests carried out by the national major science and technology special project "drilling technology for efficient development of low permeability oil and gas fields" research project, due to the above good performance tests of polycarbonate, reflect the significant effect of advanced technology in promoting oil production:

-- Shengli low permeability oil field test block: Shengli oil field has implemented 12 well horizontal well development in more than 10 low permeability blocks such as fan 147 block and Liang 8 block, The maximum single well production capacity reaches 35 tons/day of stable oil production, and the peak production reaches 108 tons/day, which is 5-7 times that of the vertical wells in the same period. Among them, four fracturing horizontal wells and one conventional horizontal well are implemented in fan 147 and other blocks with permeability lower than 30md, which is 2-5 times that of the vertical wells. This has explored a new and efficient development idea for the difficult to produce reserves in low permeability blocks of Shengli Oilfield

-- West Sichuan low permeability gas reservoir test block: West Sichuan gas field has successfully implemented 8-well staged fracturing of horizontal wells in the medium and shallow low permeability and difficult to produce reserves, with an average production capacity of 2.2 times that of the adjacent vertical wells, and achieved a landmark breakthrough in the first horizontal well in the deep layer of West Sichuan, new h, with a significant effect of 2224700 m3/day. At the same time, in 2009, the average drilling cycle of deep wells in Western Sichuan was shortened by 75 days, the average ROP increased by 0.11 M/h, and created 10 new records for deep well drilling in Western Sichuan, accelerating the pace of deep exploration and development in Western Sichuan

-- Daniudi low permeability gas reservoir test block: 15 horizontal wells were implemented using the whole process underbalance and new drilling and completion fluid technology, with an average single well production of 15000 m3/day, and the natural production capacity was established in HE1 reservoir for the first time, ending Daniudi's history of "taking reservoir reconstruction as the only means of production and construction" for many years, and overcoming the technical bottleneck of natural production, It shows a good prospect for the liberation of 2/3 of the undeveloped low-grade reserves in the gas field

background on October 18, 2009, when Hu Jintao, general secretary of the CPC Central Committee, President of the state and chairman of the Central Military Commission, visited Shengli Oilfield in person, he fully affirmed the major achievements made by Shengli Oilfield in exploration and development. The general secretary pointed out that the 48 years of Shengli Oilfield have not been easy, and the geological conditions of the oilfield are very complex. You have met the difficulties, strengthened scientific research, made breakthroughs in oil exploration and development technology, and ensured the stable and high yield of Shengli Oilfield. In the future, in the face of complex oil and gas reservoirs and geological bodies, we should also respect talents, rely on science and technology, vigorously promote scientific and technological innovation, constantly climb the peak of oil exploration and development, and ensure the stable and high yield of Shengli Oilfield. This is a commendation for the scientific and technological innovation of Shengli Oilfield, as well as for the petroleum science and technology front. The field test results of the national major scientific and technological project "drilling technology for efficient development of low permeability oil and gas fields and then connecting the power line" are also vivid footnotes to the speech of the general secretary

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