What are the specific application contents of oilfield sludge treatment technology? Zhongda Consulting will answer the questions for you below.
1. There are problems with the current treatment technology
The No. 2 Oil Production Plant invests 200×104 yuan in water injection residue treatment every year, and the treatment technology is only a simple reinjection and cannot It serves the purpose of reducing water and increasing oil, but the economic benefits of the treatment process are poor.
2. The significance of carrying out research on water injection residue particle control agent
1. By carrying out research on water injection residue, we will gradually explore the processing technology of gel particles with water injection residue as the main component, and provide Seeking technical support for the water injection residue treatment process;
2. Using water injection residue particles for water well profile control tests can, on the one hand, solve the problem of profile control in some wells with uneven water absorption profiles, and on the other hand, it can improve the treatment of water injection residues Economic benefits;
3. Reduce the cost of profile control measures by conducting research on water injection residues;
4. Through research on water injection residue profile control technology, we can meet the requirements of Es2 2 3 Reservoir profile control and flooding development needs.
3. Analysis of water injection residue components
The composition of water injection residue is determined by X-ray diffraction analysis method as follows.
Composition table of water injection residue
Calcium carbonate, magnesium carbonate, iron sulfide and calcium sulfate in water injection residue will not react with the initiator and have no effect on polymerization, but calcium hydroxide May accelerate polymerization reactions.
1. Analysis of particle size of water injection residue
The particle size of 80 water injection residue is about 40 μm, which is equivalent to the particle size of calcium bentonite (20-35 μm). It can realize the particle size of water injection residue at high Filling of polymer three-dimensional network structure.
2. Suspension of water injection residue solution
2.1 Water injection residue dispersion performance test
Add water injection residue into clean water, stir, and conduct a dispersion test. Experiments show that when the specific gravity of the water injection residue solution reaches 1.3g/cm3, it becomes difficult to stir, so the specific gravity of the water injection residue we choose must be less than 1.3g/cm3.
2.2 Water-injection residue solution stratification experiment
After stirring the dispersed water-injection residue solution evenly, quickly pour it into a measuring cylinder and observe the settling time. Experimental results show that when the specific gravity of the water-injection residue solution reaches 1.20g/cm3, the sedimentation accelerates, and accumulation will occur during polymerization during the production process. It may even cause the polymer to be incompletely wrapped and cause the water-injection residue to come out. In order to meet the production requirements of water injection residue particles, choose a water injection residue liquid with a specific gravity less than 1.20g/cm3.
3. Selection of polymer monomers
Chen An et al. [1] added different amounts of acrylamide (AM) to the water injection residue solution with a specific gravity of 1.1 to 1.25g/cm3 and stirred After uniformity, pour into a measuring cylinder and observe the settling time.
It can be seen from the experimental results that the water injection residue solution with a monomer concentration of 8 to 10 and a specific gravity of 1.10 to 1.20g/cm3 can achieve better polymerization. In order to consume the water injection residue to the maximum extent and reduce the amount of monomer, we selected 8 monomers and a water injection residue with a specific gravity of 1.2 g/cm3 for the experiment.
4. Selection of cross-linking agent
Experiments show that when the cross-linking agent concentration is between 0.05 and 0.15, the gelling time and particle strength of the water injection residue can meet the requirements. In order to To ensure the production efficiency and the quality of the water-injection residue pre-gel particles, the cross-linking agent concentration is set to 0.1.
5. Optimization of initiator
Experiments show that when the temperature is constant, the higher the initiator concentration, the faster the reaction rate. In order to prevent the high initiator concentration from causing rapid reaction and causing implosion in a short time, or the initiator concentration being too low to easily form a gel, the initiator concentration range is set at 0.1 to 0.2 at 10 to 30°C.
0Based on the above experiments, the formula of water-injection residue pre-gel particles is determined to be:
8 monomer 1.20g/cm3 water-injection residue .1 cross-linking agent 0.1~0.2 initiator.
6. Performance evaluation of water-injection residue pre-gel particles
In order to test the performance of water-injection residue pre-gel particles, the physical properties of water-injection residue pre-gel particles (swelling time, water absorption ability, strength, toughness), adaptability (high temperature aging, salt resistance), and injectability evaluation.
Through experimental evaluation, the water-injection residue pre-gel particles have good elasticity and toughness, and have good temperature and salt resistance, which is equivalent to calcium soil gel particles.
IV. Implementation status and effects
12 wells were completed from 2011 to 2012, and a total of 46212m3 of water injection residue profile control agent, 415t of water injection residue pregel particles, and 3475t of water injection residue were injected . Comparing the measures before and after, the average water injection pressure increased by 9.3MPa, and the daily water injection decreased by 34m3. There are 5 comparable profiles, and the water absorption thickness increased by 24.4m/11n; among them, 33.5m/16n of new water-absorbing layers were activated, and 9.1m/5n of strong water-absorbing layers were reduced, which effectively solved the contradiction between layers and improved the development effect. There are 18 oil wells corresponding to 10 wells that have seen oil increase effects to varying degrees. Comparing the measures before and after, the daily liquid production dropped by 2.4 tons, the daily oil production increased by 20.5 tons, and the water content dropped by 1.1 percentage points. As of December 2012, the measures had resulted in a cumulative oil increase of 2,576 tons.
V. Economic (Social) Benefit Analysis
1. Investment
The actual investment in this project is 1.807 million yuan.
2. Benefits
A total of 2,576 tons of oil increased, creating benefits: 2,576 tons × 0.4788 million yuan/ton = 12.3339 million yuan;
3. Put into production Output ratio
Input: output=180.7:1233.39=1:6.8.
VI. Conclusion and understanding
1. Oilfield water injection residue can be produced and processed into water injection residue pre-gel particles after modification, and can be used to replace gel particles for water well profile control and flooding. The cost of measures is reduced and the economic benefits of water injection residue treatment are improved.
2. After the implementation of the water injection residue profile control project, the water injection pressure of the control wells increased, the profile was improved, and the corresponding oil wells saw a good oil increase effect, and the economic benefits were obvious.
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